U.S. patent application number 10/958183 was filed with the patent office on 2005-05-19 for multi-function work machine.
Invention is credited to Lumbers, Michael T., Mullins, H. Stanley, Self, Kelvin P., Sewell, Cody L..
Application Number | 20050102866 10/958183 |
Document ID | / |
Family ID | 34434905 |
Filed Date | 2005-05-19 |
United States Patent
Application |
20050102866 |
Kind Code |
A1 |
Sewell, Cody L. ; et
al. |
May 19, 2005 |
Multi-function work machine
Abstract
A work machine having a first work member and a second work
member, both operated from a pivotal control station. In a
preferred embodiment the work machine has a backhoe assembly and a
loader assembly both supported on a frame and operable from the
pivotal control station. The work machine may have left and right
low-profile drive systems that allow the first work member to
perform work outside and parallel to the longitudinal center axis
of the work machine. The work machine has a low-profile power
source and operator platform that allow unobstructed visibility of
the first and second work members from the control station.
Inventors: |
Sewell, Cody L.; (Perry,
OK) ; Lumbers, Michael T.; (Perry, OK) ;
Mullins, H. Stanley; (Perry, OK) ; Self, Kelvin
P.; (Stillwater, OK) |
Correspondence
Address: |
MCKINNEY & STRINGER, P.C.
101 N. ROBINSON
OKLAHOMA CITY
OK
73102
US
|
Family ID: |
34434905 |
Appl. No.: |
10/958183 |
Filed: |
October 4, 2004 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
|
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60508339 |
Oct 3, 2003 |
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Current U.S.
Class: |
37/411 |
Current CPC
Class: |
E02F 9/166 20130101;
E02F 3/964 20130101; E02F 3/325 20130101; E02F 3/386 20130101; E02F
3/384 20130101 |
Class at
Publication: |
037/411 |
International
Class: |
E02F 003/64 |
Claims
1. A work machine comprising: a frame having a first end and a
second end; a first work member supported by the frame so that the
first work member is operable at the first end of the frame; a
second work member supported by the frame so that the second work
member is operable at the second end of the frame; a pivotal
control station supported by the frame and movable between at least
a first position and a second position and adapted to control the
first work member when in the first position and to control the
second work member when in the second position.
2. The work machine of claim 1 wherein the second work member
comprises a tool carrier.
3. The work machine of claim 2 further comprising a work tool
supported by the tool carrier.
4. The work machine of claim 1 wherein the first work member
comprises a tool carrier and wherein the second work member
comprises a tool carrier.
5. The work machine of claim 1 wherein the pivotal control station
comprises a plurality of controls supported on the control station,
the controls being adapted to control operation of the first work
member and the second work member.
6. The work machine of claim 5 wherein the control station
comprises a pivotal operator seat and wherein the plurality of
controls are disposed at the operator seat.
7. The work machine of claim 1 comprising a low-profile power
source supported by the frame.
8. The work machine of claim 7 wherein the second work member
comprises: a lift arm having a first end and a second end, the
first end being pivotally connected to the frame, and the second
end being movable in a range of motion comprising a lower position
and an upper position; and a work tool supported by the second end
of the lift arm.
9. The work machine of claim 8 wherein the work tool comprises a
loader bucket.
10. The work machine of claim 8 further comprising: a first
unobstructed line of sight extending from the control station over
the low-profile power source to the work tool when the second end
of the lift arm is in the lower position; and a second unobstructed
line of sight extending from the control station to beyond the work
tool when the second end of the lift arm is in the upper
position.
11. The work machine of claim 1 further comprising a low-profile
left drive system and a low-profile right drive system, both
systems being supported by the frame for propelling the frame in a
plurality of directions.
12. The work machine of claim 11 wherein the left and right drive
systems each comprise an endless track.
13. The work machine of claim 11 wherein the left and right drive
systems each comprise at least two low-profile wheels and wherein
the wheels can be steered in a skid arrangement.
14. The work machine of claim 11 wherein the first work member
comprises: a swing arm pivotally connected to the frame, the swing
arm having a central longitudinal axis; a swing post pivotally
connected to the swing arm; a swing arm actuator fixed to the frame
and adapted to pivot the swing arm and swing post relative to the
frame to a plurality of positions, the plurality of positions
including at least one position placing the swing post beyond the
left drive system, and at least one position placing the swing post
beyond the right drive system; and a swing post actuator fixed to
the swing arm and adapted to impart a pivot motion to the swing
post relative to the swing arm to either side of the central
longitudinal axis of the swing arm such that the pivot motion of
the swing post is not restricted by the position of the swing
arm.
15. The work machine of claim 1 wherein the frame comprises a
longitudinal axis comprising a midpoint; wherein the pivotal
control station comprises a substantially vertical pivot axis
disposed near the midpoint of the longitudinal axis; wherein the
first work member comprises a substantially vertical pivot axis
disposed near the midpoint of the longitudinal axis of the frame;
and wherein the second work member comprises a substantially
horizontal pivot axis disposed near the midpoint of longitudinal
axis of the frame.
16. The work machine of claim 15 wherein the pivot axis of the
control station, the pivot axis of the first work member, and the
pivot axis of the second work member are disposed in relation to
each other to create a close-coupled work machine.
17. The work machine of claim 16 wherein the pivot axis of the
first work member and the pivot axis of the second work member
substantially overlap.
18. The work machine of claim 1 wherein the first work member
comprises: a swing arm pivotally connected to the frame; a swing
post pivotally connected to the swing arm; a work tool supported by
the swing post; and an unobstructed line of sight extending from
the control station to the work tool of the first work member.
19. An excavator comprising: a frame having a first end and a
second end; a control station supported by the frame; a low-profile
power source supported by the frame; a first work member supported
by the frame so that the first work member is operable at the first
end of the frame and operated by the control station; a second work
member supported by the frame so that the second work member is
operable at the second end of the frame and operated by the control
station, the second work member comprising: a lift arm having a
first end and a second end, the first end being pivotally connected
to the frame, and the second end being movable in a range of motion
comprising a lower position and an upper position; a work tool
supported by the second end of the lift arm; a first unobstructed
line of sight extending from the control station over the
low-profile power source to the work tool when the second end of
the lift arm is in the lower position; and a second unobstructed
line of sight extending from the control station to beyond the work
tool when the second end of the lift arm is in the upper
position.
20-21. (canceled)
22. The excavator of claim 19 wherein the control station is
movable between at least a first position and a second position and
adapted to control the first work member when in the first position
and to control the second work member when in the second
position.
23. The excavator of claim 22 wherein the control station comprises
a plurality of controls operatively supported on the control
station, the controls being adapted to control operation of the
first work member and the second work member.
24-25. (canceled)
26. The excavator of claim 19 further comprising a low-profile left
drive system and a low-profile right drive system both systems
being supported by the frame for propelling the frame in a
plurality of directions.
27-28. (canceled)
29. The excavator of claim 26 wherein the first work member
comprises: a swing arm pivotally connected to the frame, the swing
arm having a central longitudinal axis; a swing post pivotally
connected to the swing arm; a swing arm actuator fixed to the frame
and adapted to pivot the swing arm and swing post relative to the
frame to a plurality of positions, the plurality of positions
including at least one position placing the swing post beyond the
left drive system, and at least one position placing the swing post
beyond the right drive system; and a swing post actuator fixed to
the swing arm and adapted to impart a pivot motion to the swing
post relative to the swing arm to either side of the central
longitudinal axis of the swing arm such that the pivot motion of
the swing post is not restricted by the position of the swing
arm.
30. The excavator of claim 19 wherein the frame comprises a
longitudinal axis comprising a midpoint; wherein the pivotal
control station comprises a substantially vertical pivot axis
disposed near the midpoint of the longitudinal axis; wherein the
first work member comprises a substantially vertical pivot axis
disposed near the midpoint of the longitudinal axis of the frame;
and wherein the second work member comprises a substantially
horizontal pivot axis disposed near the midpoint of the
longitudinal axis of the frame.
31. The excavator of claim 30 wherein the pivot axis of the control
station, the pivot axis of the first work member, and the pivot
axis of the second work member are disposed in relation to each
other to create a close-coupled work machine.
32. (canceled)
33. The excavator of claim 19 wherein the first work member
comprises: a swing arm pivotally connected to the frame; a swing
post pivotally connected to the swing arm; a work tool supported by
the swing post; and an unobstructed line of sight extending from
the control station to the work tool of the first work member.
34. An excavator comprising: a frame comprising a first end and a
second end; a low-profile left drive system and a low-profile right
drive system both supported by the frame for propelling the frame
in a plurality of directions; a first work member supported by the
frame so that the first work member is operable at the first end of
the frame, the first work member comprising: a swing arm pivotally
connected to the frame and having a central longitudinal axis; a
swing post pivotally connected to the swing arm; a swing arm
actuator fixed to the frame and adapted to pivot the swing arm and
swing post relative to the frame to a plurality of positions, the
plurality positions including at least one position placing the
swing post beyond the left drive system and at least one position
placing the swing post beyond the right drive system; and a swing
post actuator fixed to the swing arm and adapted to impart a pivot
motion to the swing post relative to the swing arm to either side
of the central longitudinal axis of the swing arm such that the
pivot motion of the swing post is not restricted by the position of
the swing arm; and a second work member supported by the frame so
that the second work member is operable at the second end of the
frame.
35. The excavator of claim 34 wherein the first work member
comprises a work tool operatively connected to the swing post.
36. The excavator of claim 35 wherein the work tool comprises: a
boom connected to the swing post; a dipper connected to the boom;
and an excavating bucket connected to the dipper.
37. The excavator of claim 34 further comprising a pivotal control
station supported by the frame and movable between at least a first
position and a second position and adapted to control the first
work member when in the first position and to control the second
work member when in the second position.
38. The excavator of claim 37 wherein the pivotal control station
comprises a plurality of controls supported on the control station,
the controls being adapted to control operation of the first work
member and the second work member.
39-47. (canceled)
48. The excavator of claim 34 further comprising: a work tool
supported by the swing post; and an unobstructed line of sight
extending from the control station to the work tool of the first
work member.
49. A work machine comprising: a frame having a first end, a second
end and a longitudinal axis comprising a midpoint; a pivotal
control station supported by the frame and having a substantially
vertical pivot axis disposed near the midpoint of the longitudinal
axis; a pivotal first work member supported by the frame having a
substantially vertical pivot axis disposed near the midpoint of the
longitudinal axis of the frame; and a pivotal second work member
supported by the frame having a substantially horizontal pivot
axis.
50. The work machine of claim 49 wherein the pivotal control
station is movable between a first position and a second position
and adapted to control the first work member when in the first work
position and to control the second work member when in the second
work position.
51. The work machine of claim 49 wherein the pivotal control
station comprises a plurality of controls supported on the control
station, the controls being adapted to control operation of the
first work member and the second work member.
52-55. (canceled)
56. The work machine of claim 49 further comprising a low-profile
power source supported by the frame.
57. The work machine of claim 56 wherein the second work member
comprises: a lift arm having a first end and a second end, the
first end being pivotally connected to the frame, and the second
end being movable in a range of motion comprising a lower position
and an upper position; and a work tool supported by the second end
of the lift arm.
58. (canceled)
59. The work machine of claim 57 further comprising: a first
unobstructed line of sight extending from the control station over
the low-profile power source to the work tool when the second end
of the lift arm is in the lower position; and a second unobstructed
line of sight extending from the control station to beyond the work
tool when the second end of the lift arm is in the upper
position.
60. The work machine of claim 49 further comprising a low-profile
left drive system and a low-profile right drive system, both
systems being supported by the frame for propelling the frame in a
plurality of directions.
61. The work machine of claim 60 wherein the first work member
comprises: a swing arm pivotally connected to the frame, the swing
arm having a central longitudinal axis; a swing post pivotally
connected to the swing arm; a swing arm actuator fixed to the frame
and adapted to pivot the swing arm and swing post relative to the
frame to a plurality of positions, the plurality of positions
including at least one position placing the swing post beyond the
left drive system, and at least one position placing the swing post
beyond the right drive system; and a swing post actuator fixed to
the swing arm and adapted to impart a pivot motion to the swing
post relative to the swing arm to either side of the central
longitudinal axis of the swing arm such that the pivot motion of
the swing post is not restricted by the position of the swing
arm.
62. The work machine of claim 49 wherein the pivot axis of the
control station, the pivot axis of the first work member, and the
pivot axis of the second work member are disposed in relation to
each other to create a close-coupled work machine.
63. The work machine of claim 49 wherein the first work member
comprises: a swing arm pivotally connected to the frame; a swing
post pivotally connected to the swing arm; a work tool supported by
the swing post; and an unobstructed line of sight extending from
the control station to the work tool of the first work member.
64. (canceled)
65. An excavator comprising: a frame having a first end and a
second end; a pivotal control station supported by the frame; a
first work member supported by the frame so that the first work
member is operable at the first end of the frame, the first work
member comprising; a swing arm pivotally connected to the frame; a
swing post pivotally connected to the swing arm; and a work tool
supported by the swing post; a second work member supported by the
frame so that the second work member is operable at the second end
of the frame; an unobstructed line of sight extending from the
control station to the work tool of the first work member.
66. The excavator of claim 65 wherein the pivotal control station
is movable between at least a first position and a second position
and adapted to control the first work member when in the first work
position and to control the second work member when in the second
work position.
67. The excavator of claim 65 wherein the pivotal control station
comprises a plurality of controls supported on the control station,
the controls being adapted to control operation of the first work
member and the second work member.
68. (canceled)
69. The excavator of claim 65 further comprising a low-profile
power source supported by the frame.
70. The excavator of claim 69 wherein the second work member
comprises: a lift arm having a first end and a second end, the
first end being pivotally connected to the frame, and the second
end being movable in a range of motion comprising a lower position
and an upper position; and a work tool supported by the second end
of the lift arm.
71. The excavator of claim 70 further comprising: a first
unobstructed line of sight extending from the control station over
the low-profile power source to the work tool when the second end
of the lift arm is in the lower position; and a second unobstructed
line of sight extending from the control station to beyond the work
tool when the second end of the lift arm is in the upper
position.
72. The excavator of claim 65 wherein the pivot axis of the control
station, the pivot axis of the first work member, and the pivot
axis of the second work member are disposed in relation to each
other to create a close-coupled work machine.
73. A work machine comprising: a frame having a first end and a
second end; a pivotal control station supported by the frame and
having a substantially vertical pivot axis; a pivotal first work
member supported by the frame so that the first work member is
operable at the first end of the frame and the first work member
comprising a substantially vertical pivot axis; a pivotal second
work member supported by the frame so that the second work member
is operable at the second end of the frame and comprises a
substantially horizontal pivot axis; wherein the pivot axis of the
control station, the pivot axis of the first work member, and the
pivot axis of the second work member are disposed in relation to
the frame to create a close-coupled work machine.
74. The work machine of claim 73 wherein the pivotal control
station is movable between at least a first work position and a
second work position and adapted to control the first work member
when in the first work position and to control the second work
member when in the second work position.
75-76. (canceled)
77. The work machine of claim 73 further comprising a low-profile
left drive system and a low-profile right drive system, both
systems being supported by the frame for propelling the frame in a
plurality of directions.
78. The work machine of claim 77 wherein the first work member
comprises: a swing arm pivotally connected to the frame, the swing
arm having a central longitudinal axis; a swing post pivotally
connected to the swing arm; a swing arm actuator fixed to the frame
and adapted to pivot the swing arm and swing post relative to the
frame to a plurality of positions, the plurality of positions
including at least one position placing the swing post beyond the
left drive system, and at least one position placing the swing post
beyond the right drive system; and a swing post actuator fixed to
the swing arm and adapted to impart a pivot motion to the swing
post relative to the swing arm to either side of the central
longitudinal axis of the swing arm such that the pivot motion of
the swing post is not restricted by the position of the swing
arm.
79-80. (canceled)
Description
CROSS REFERENCE TO RELATED APPLICATION
[0001] This application claims the benefit of U.S. Provisional
Application No. 60/508,339 filed Oct. 3, 2003, the contents of
which are incorporated fully herein by reference.
FIELD OF THE INVENTION
[0002] The present invention relates generally to multi-function
work machines, and in particular to a compact multi-function work
machine adapted to accept alternative work tools.
SUMMARY OF THE INVENTION
[0003] The present invention is directed to work machine comprising
a frame, a first work member, a second work member, and a pivotal
control station. The frame has a first end and a second end. The
first work member is supported by the frame so that the first work
member is operable at the first end of the frame. The second work
member is supported by the frame so that the second work member is
operable at the second end of the frame. The pivotal control
station is supported by the frame and movable between at least a
first position and a second position. The pivotal work station is
adapted to control the first work member when in the first position
and to control the second work member when in the second
position.
[0004] The present invention further comprises an excavator. The
excavator comprises a frame having a first end and a second end, a
control station, a low-profile power source supported by the frame,
and a control station also supported by the frame. A first work
member is supported by the frame so that the first work member is
operable at the first end of the frame and operated by the control
station. A second work member is supported by the frame so that the
second work member is operable at the second end of the frame and
operated by the control station. The second work member comprises a
lift arm and a work tool. The lift arm has a first end and a second
end. The first end of the lift arm is pivotally connected to the
frame. The second end of the lift arm is movable in a range of
motion comprising a lower position and an upper position. The work
tool is supported by the second end of the lift arm. The excavator
further comprises a first unobstructed line of sight and a second
unobstructed line of sight. The first unobstructed line of sight
extends from the control station over the low-profile power source
to the work tool when the second end of the lift arm is in the
lower position. The second unobstructed line of sight extends from
the control station to beyond the work tool when the second end of
the lift arm is in the upper position.
[0005] The present invention further includes an excavator that
comprises a frame, a low-profile left drive system and a
low-profile right drive system. The low-profile left drive system
and the low-profile right drive system are both supported by the
frame and used to propel the frame in a plurality of directions.
The excavator further comprises a first work member and a second
work member. The first work member is supported by the frame so
that the first work member is operable at the first end of the
frame. The first work member comprises a swing arm, a swing post, a
swing post actuator, and a swing arm actuator. The swing arm is
pivotally connected to the frame and has a central longitudinal
axis. The swing post is pivotally connected to the swing arm. The
swing arm actuator is fixed to the frame and adapted to pivot the
swing arm and swing post relative to the frame to a plurality of
positions. The plurality positions includes at least one position
placing the swing post beyond the left drive system and at least
one position placing the swing post beyond the right drive system.
The swing post actuator is fixed to the swing arm and adapted to
impart a pivot motion to the swing post relative to the swing arm
to either side of the central longitudinal axis of the swing arm
such that the pivot motion of the swing post is not restricted by
the position of the swing arm. The second work member is supported
by the frame so that the second work member is operable at the
second end of the frame.
[0006] Further still, the present invention includes a work machine
comprising a frame, a pivotal control station, a pivotal first work
member and a pivotal second work member. The frame has a first end,
a second end and a longitudinal axis comprising a midpoint. The
pivotal control station is supported by the frame and has a
substantially vertical pivot axis disposed near the midpoint of the
longitudinal axis. The pivotal first work member is supported by
the frame and has a substantially vertical pivot axis disposed near
the midpoint of the longitudinal axis of the frame. The pivotal
second work member is supported by the frame and has a
substantially horizontal pivot axis.
[0007] The present invention further includes an excavator
comprising a frame having a first end and a second end, a pivotal
control station supported by the frame, a first work member, and a
second work member. The first work member is supported by the frame
so that the first work member is operable at the first end of the
frame. The first work member comprises a swing arm pivotally
connected to the frame, a swing post pivotally connected to the
swing arm, and a work tool supported by the swing post. The second
work member is supported by the frame so that the second work
member is operable at the second end of the frame. The excavator
further includes an unobstructed line of sight extending from the
control station to the work tool of the first work member.
[0008] Further still, the present invention includes, a work
machine comprising a frame having a first end and a second end, a
pivotal control station, a pivotal first work member, and a pivotal
second work member. The control station is supported by the frame
and has a substantially vertical pivot axis. The pivotal first work
member is supported by the frame so that the first work member is
operable at the first end of the frame. Further, the first work
member comprises a substantially vertical pivot axis. The pivotal
second work member is supported by the frame so that the second
work member is operable at the second end of the frame and
comprises a substantially horizontal pivot axis. The pivot axis of
the control station, the pivot axis of the first work member, and
the pivot axis of the second work member are disposed in relation
to the frame to create a close-coupled work machine.
BRIEF DESCRIPTION OF THE DRAWINGS
[0009] FIG. 1 is a side elevational view of a multi-function work
machine. The work machine has a first work member and a second work
member both shown supported on a frame. The machine of FIG. 1 is
equipped with a pivotal control station from which the first and
second work members may be operated.
[0010] FIG. 2 is a perspective view of the frame of the work
machine shown in FIG. 1. FIG. 2 illustrates positioning of the
pivotal axes of the work members and the control station.
[0011] FIG. 3 is a perspective cut-away view of the frame of FIG.
2. FIG. 3 shows the attachment of the first work member to the
frame. The first work member shown in FIG. 3 has a swing arm and a
swing post used to support and move a work tool attached to the
swing post.
[0012] FIG. 4 is a top view of the work machine of FIG. 1
illustrating alternate stowing positions of the excavator
bucket.
[0013] FIG. 5 is a top view of the work machine of FIG. 4 having
the roll-over protection canopy removed so that the operator's seat
is visible. FIG. 5 illustrates the range of motion of the swing arm
shown in FIG. 3.
[0014] FIG. 6 is a top view of the work machine of FIG. 5
illustrating the range of motion of the work tool when used with
the swing arm and swing post of the present invention.
[0015] FIG. 7 is a top view of the work machine illustrating the
use of the excavator bucket to dig a trench.
[0016] FIG. 8 is a side view of the work machine of FIG. 1
illustrating an unobstructed line of sight from the control station
to the work tool.
[0017] FIG. 9 is a side view of the work machine of FIG. 1
illustrating an unobstructed line-of-sight from the control station
to an excavator bucket positioned below ground.
[0018] FIG. 10 is a side view of the work machine illustrating a
trencher as a work tool supported by the frame.
[0019] FIG. 11 is a side view of the work machine of the present
invention having an offsetable vibratory plow as an alternate work
tool supported by the frame.
[0020] FIG. 12 is a side view of the work machine having an
alternative configuration. The work machine of FIG. 12 has a "dump
bed" attached to the work member.
DESCRIPTION
[0021] Turning now to the figures and first to FIG. 1, there is
shown therein a work machine 10 of the present invention. The work
machine 10 shown in FIG. 1 is an excavator that, among other
things, may be used to dig trenches and move earth. The work
machine 10 comprises a frame 12 having a first end 14 and a second
end 16. The frame 12 supports a first work member 18 and a second
work member 20. The first work member 18 is supported by the frame
12 so that it is operable at the first end 14 of the frame. The
second work member 20 is supported by the frame 12 so that it is
operable at the second end 16 of the frame. The work machine 10 of
FIG. 1 further includes a control station 22 supported by the frame
12. The control station 22 is movable between a first position A
and a second position B. When placed in position B the control
station 22 controls the function of the first work member 18. The
second work member 20 is controlled by the control station 22 when
the control station is in position A.
[0022] The first work member 18 may comprise a tool carrier 24. The
tool carrier 24 may comprise a swing arm 26 connected to the frame
12, a swing post 28 connected to the swing arm, and a work tool
connected to the swing post. For purposes of illustration, the work
tool of FIG. 1 is a backhoe attachment used to dig trenches. The
backhoe comprises a boom 30, a dipper 32, and an excavator bucket
34. The boom 30, dipper 32 and bucket 34 are pivotally connected in
series and positioned or moved with respect to each other using
hydraulic cylinders 36, 38, and 40. The backhoe attachment is moved
and positioned relative to the frame 12 by moving the swing arm 26
and swing post 28. The swing arm 26 may have a swing arm actuator
42 comprising a hydraulic cylinder that is adapted to pivot the
swing arm and the swing post 28 relative to the frame 12 to a
plurality of positions. A swing post actuator 44 (FIG. 3) may be
fixed to the swing arm 26 and adapted to impart pivot motion to the
swing post 28 relative to the swing arm 26.
[0023] The second work member 20 may comprise a tool carrier 46.
The tool carrier 46 may be constructed to support a variety of
alternative work tools. For illustrative purposes, the work tool
shown attached to the tool carrier 46 in FIG. 1 is loader bucket
48. The tool carrier 46 and loader bucket 48 are supported by one
or more lift arms 50 having a first end 52 and a second end 54.
Each lift arm 50 is pivotally connected to the second work member
support 56 of the frame 12 at pivot point 58. The second end 54 of
the lift arm 50 is movable in a range of motion comprising a lower
position (shown in FIG. 1) and an upper position. The lift arm 50
may be raised and supported at any position within its range of
motion using a lift arm actuator 60. The lift arm actuator 60 is
attached to the second work member support 56 at pivot point 62 and
to a bracket 64 supported at the second end 54 of the lift arm.
[0024] The tool carrier 46 may comprise a quick-attach mechanism
adapted to connect to a wide variety of work tools such as the
loader bucket 48 shown in FIG. 1. The angular rotational position
of the work tool 48 may be adjusted or held at a desired "tilt"
("curl") angle by a tilt cylinder 66 connected to the tool carrier
46 and a tilt cylinder bracket 68 supported by the lift arm 50. It
will be appreciated that the lift arm 50 may be telescopic at its
second end 54 for extended reach and lift height of the work tool
48.
[0025] Continuing with FIG. 1, the work machine 10 further may
comprise a low profile power source 70 supported by the frame 12.
The low-profile power source 70 may comprise an internal combustion
engine (not shown) supported within an engine compartment 76. It
will be appreciated, of course, that different type engines or
power sources may be used to power the work machine 10. The power
source 70 is adapted to drive operation of the left 72 and right 74
drive systems, and the various hydraulic and electrical systems
used with the work machine 10. The engine compartment 76 of the
low-profile drive system 70 is sloped such that a first
line-of-sight between the control station 22 and the work tool 48
is unobstructed when the control station is in position A and the
work tool is in the lower position shown in FIG. 1. However, it
will be appreciated that the lift arm 50 may be constructed in such
a manner that a second unobstructed line-of-sight extends from the
control station 22 to beyond the work tool 48 when the second end
54 of the lift arm 50 is in the upper position (not shown).
[0026] The frame 12 is adapted to support a low-profile left 72 and
right 74 (FIG. 5) drive system. The low-profile left 72 and right
74 drive systems are both supported by the frame for propelling the
frame in a plurality of directions. The drive systems 72 and 74
shown in FIGS. 1 and 5 comprise an all-terrain endless track
system. However, it will be appreciated that the left 72 and right
74 drive systems may each comprise a plurality of low-profile
wheels that are capable of being steered in a skid, articulated,
coordinated or conventional arrangement without departing from the
spirit of the invention.
[0027] Referring still to FIG. 1, the pivotal control station 22 is
supported by the frame 12 and may comprise an operator seat 78
having a vertical pivot axis 80. A plurality of controls 82a and
82b may be supported on the control station 22 and, more
specifically, disposed on the operator's seat 78 for rotation
therewith. The controls 82a and 82b are adapted to control
operation of both the first work member 18 and the second work
member 20.
[0028] The control station 22 may further comprise a roll-over
protection structure ("ROPS") 84 supported by the frame 12. The
ROPS 84 is preferably a front-cantilevered canopy having two
vertical posts 86 and 88. Use of the two-post front-cantilevered
canopy ROPS 84 provides improved visibility of both the first work
member 18 or the second work member 20 during the operation of
each. Alternatively, the ROPS may have three or more vertical posts
or other ROPS structure configurations positioned to allow improved
visibility.
[0029] The process of switching the on-seat controls 82a and 82b
from functional operation of the first work member 18 to operation
of the second work member 20 (or vice versa) will now be described.
Switching of operation may be initiated by a function selector
switch (not shown). In a first position of the switch, the on-seat
controls 82a and 82b operate a hydraulic circuit powering the
above-mentioned drive systems (via a left joystick) while also
being available to actuate the movements of the second work member
20 (via the right joystick). In the second position of the function
selector switch, the on-seat controls 82a and 82b operate the
movements of the first work member 18. Actuation of the switch
causes a pilot pressure controlled diverter valve (not shown) in
each of two control valve sections to switch their operative
control to the first work member 18 or to the second work member
20. Additionally, the switch may cause a seat-mounted valve
manifold 79 to shift the operative control of the left control 82a
between control of the drive systems 72 and 74 and control of
certain actions of the first work member 18. The operative control
provided by the controls 82a and 82b are summarized below.
[0030] In accordance with the present invention, there may be two
basic modes of operation of the work machine 10. Mode 1 involves
the second work member 20 and the drive systems 72 and 74, while
Mode 2 applies to the first work member 18. In operational Mode 1
the left control 82a may operate the drive systems 72 and 74 by
pilot control of their respective hydrostatic pumps. Forward
movement of the left control 82a causes the work machine 10 to move
forward. Rearward movement of the left control 82a causes the work
machine 10 to move rearward. The speed attained by the work machine
10 is related to the amount the left control 82a is displaced from
its neutral position. Charge circuit pressure from one of the
hydrostatic pumps flows through the displaced left control 82a to
control the stroking of each hydrostatic pump. Left-right motion of
the left control 82a causes the work machine 10 to steer in the
respective direction. When the left control 82a is at either extent
of its lateral motion, counter-rotation of drive systems 72 and 74
may cause a zero turning radius to be accomplished in the
associated direction.
[0031] In operational Mode 1, the right control 82b may operate the
actions of the second work member 20. In this instance (and similar
ones described below), the charge circuit pressure flowing through
the displaced right control 82b causes the pilot-operated
displacement of one or more valve spools in the main control valve.
The following description is given for the specific case of the
second work member 20 comprising a loader. Forward and rearward
displacement of the control 82b from its neutral position causes
the lift arms 50 to raise and lower, respectively. Left and right
displacement of the control 82b causes the loader bucket 48 to curl
upward to contain a payload, or tilt (uncurl) to accept or
discharge a payload.
[0032] A toggle switch (not shown) on top of the control 82b may
control the flow of hydraulic power to an accessory tool that might
be mounted on the first 18 or the second work member 20--for
instance a posthole digger, pavement breaker, or the various work
tools described hereinafter. The toggle switch may comprise a
three-position rocker switch, where the tool activating (ON)
position is detented and the opposite OFF position is spring
returned to neutral. Whenever an operator is not properly seated in
the seat 78, an operator presence sensing system in the seat may
cause the toggle switch and the controls 82a and 82b to power down.
The system disabling shut-down may be contained within the valve
manifold 79.
[0033] Continuing with FIG. 1 the second operation mode (Mode 2)
will be described with reference to the use of a backhoe assembly
for purposes of illustration. The repositioning of the function
selector switch will cause the left control 82a to operate the boom
30, the offsetting action of the swing arm 26, and the swing action
(side to side pivoting) of the swing post 28. Displacement of the
control 82a longitudinally toward the operator raises the boom 30,
while pushing away from the neutral position lowers the boom.
Displacement of the control 82a laterally inward toward the
operator causes the swing arm 26 to offset the first work member 18
toward the operator's right, while an outward lateral motion moves
the swing arm 26 oppositely, for placement of the bucket 34 in a
desired position on or laterally offset from the longitudinal
centerline 83 (FIG. 2) of the frame 12.
[0034] A toggle switch (not shown) on top of the left control 82a
controls pivotal movement of the swing post 28 and the boom 30
attached thereto. Pressing on the portion of the rocker switch
nearest to the operator causes the boom 30 to swing toward the
operator's right, while pressing on the outer portion moves the
boom oppositely.
[0035] In Mode 2, the right control 82b controls the movement of
the dipper 32 and the backhoe bucket 34. Displacement of the
control 82b longitudinally toward the operator causes the dipper 32
to move similarly, likewise in the case when moving the control 82b
away from the neutral position. Displacement of the control 82b
laterally inward toward the operator causes the backhoe bucket 34
to curl inward toward the operator; an outward lateral motion
uncurls the bucket.
[0036] Alternatively, the controls 82a and 82b could function
electronically. Such a joystick or other type of electronic
actuator senses hand-motion direction and distance inputs from the
operator and sends correlated electrical signal(s) to a controller,
which commands the activation of electro-hydraulic valve(s) and/or
the output of variable displacement pump(s). One skilled in the art
understands that the output response from a valve or pump is
usually hydraulic flow rate, in a response proportional to the
input signal. (It is also understood that signals from controls 82a
and 82b could directly activate electro-hydraulic valves without
use of a controller.) An electro-hydraulic valve also typically
delivers a hydraulic flow rate to the circuit it controls in
proportion to the input signal. Electronic control of selected
functions enables their automatic control and eases the switching
of control function assignments to suit operator preferences. For
example, two common backhoe control patterns are described as ISO
and SAE standard control patterns. These could be selected by
simply switching the routing of the control signals via a physical
switch or by software within the controller.
[0037] The above-mentioned controller may be programmed to automate
certain functions of the work machine 10. For example, it may be
desirable to deposit spoils excavated by the first work member 18 a
distance from the excavation. Combined pivotal movement of the
swing arm 26 and the swing post 28 can accommodate this desire. The
motion-to-function assignments of control 82a--lateral motion:
swing arm 26; toggle switch: swing post 28--could be simplified by
an operator selectable "coordinated movement" control algorithm. In
this operating mode, the coordinated movement of the swing arm 26
and the swing post 28 could be initiated solely by lateral motion
of the operator's left hand. As used here, "coordinated movement"
refers to simultaneous or sequential amounts of rotation about the
respective pivot axes of the swing arm 26 (pivot axis 94) and the
swing post 28 (pivot axis 112). Their simultaneous coordinated
movement may be in a proportional relationship that is lesser than,
greater than, or equal to 1:1. The preferred proportional
setting--being site dependent--is one that pivots the first work
member 18 back and forth between the excavation alignment and the
spoil pile without need of manually adjusting the angular
relationship between the swing arm 26 and the swing post 28 at
either extent of their coordinated movement. This is particularly
important at the point of excavation. The boom 30 must be in near
parallelism with the desired alignment of the excavation whenever
the backhoe bucket 34 is poised to be lowered into the excavation.
This can be assured by implementing a "return to dig" subroutine
that automatically returns the swing arm 26 and the swing post 28
to their respective angular orientation equating to the excavation
alignment. These two "return to dig" angular parameters can be set
or input by the operator by one of several commonly known
techniques. For instance, when initially placed in the desired
positional alignment, the press of a button could cause recording
of readings from angular position sensors (e.g., angular encoders
or potentiometers) mounted at the two pivot axes. The controller
would bring the boom 30 back to this position--after it observes a
sequence of electrical control signals representing actions related
to lifting, swinging, and opening the backhoe bucket 34 to deposit
its contents at the spoil pile--upon the operator's lateral
movement of the left control 82a in the direction associated with
movement toward the excavation. The "return to dig" subroutine
would stop the respective angular motions at their set points even
though the operator may continue to hold the left control 82a
laterally displaced. Motion could be stopped prior to reaching
these set points by a brief lateral displacement of left control
82a in the opposite direction. The "return to dig" subroutine may
be utilized separately from the complete "coordinated movement"
control cycle. For instance, automated coordinated angular movement
of the swing arm 26 and the swing post 28 directed away from the
point of excavation may not be particularly helpful in situations
where the desired position and/or elevation for depositing the
spoil varies from one cycle to the next, or even less
frequently.
[0038] A useful modification (adaptation) of the "return to dig"
subroutine is to equally and oppositely coordinate the angular
motions of the swing arm 26 and the swing post 28 whenever they are
moved away from coincidence with the longitudinal central axis of
the work machine 10. In other words, the controller holds all
offset positions of the first work member 18 in parallel alignment
with the longitudinal central axis 83 of the frame 12 by utilizing
a feedback control loop that continually monitors readings from the
two angular position sensors. This "parallel offset" subroutine is
particularly advantageous if a trencher or offsetable vibratory
plow is attached to the swing arm 26. Automated control of
parallelism releases the attention of the operator to focus on
other important operational tasks. In cases where it is desired
that rear work tools of the work machine 10 be solely utilized in
parallel alignment, a "mechanized" parallel offset could be
accomplished without controller automation.
[0039] Turning now to FIG. 2 there is shown a perspective view of
the frame 12 from its first end 14. The frame 12 may be of a
box-like construction comprised of several horizontal and vertical
plates. The frame 12 may further comprise a longitudinal axis 83
comprising a midpoint 85. The plates may comprise the operator
platform plate 89, a power source support plate 90, a pair of
vertical support plates 91 and 92, and the second work member
supports 56. The cross-braced, box-like construction illustrated in
FIG. 2 provides torsional rigidity in reacting to the working
forces exerted on the frame 12 during operation of the work machine
10. The use of single plate construction for commonly transferring
loads and mounting components contributes to compactness and
simplicity of the work machine 10.
[0040] Continuing with FIG. 2, the frame 12 may also comprise a
pedestal 93 supported on the operator's platform 89 and adapted to
support the operator's seat 78 (FIG. 1). The pedestal 93 may be
disposed coaxially with the vertical pivot axis 80 of the control
station 22. As shown in FIG. 2, the vertical pivot axis 80 of the
control station 22 (FIG. 1) may be disposed along the longitudinal
axis 83 of the frame 12 such that it intersects the longitudinal
axis. The vertical pivot axis 94 of the first work member 18 (FIG.
1) is likewise disposed along the longitudinal axis 83 of the frame
12 and passes through a yet to be described first work member 18
mounting assembly.
[0041] The vertical side plates 91 and 92 support the second work
member supports 56 and a gauge panel 96. The second work member
supports 56 may be welded to the outer surface 98 of vertical side
plates 91 and 92. The second work member supports 56 may have
openings 101 and 102 for mounting the second work member 20 to the
frame 12. Thus, when mounted to the frame 12, the second work
member 20 comprises a substantially horizontal pivot axis 103
disposed in relation to the longitudinal axis 83 of the frame 12.
In FIG. 2, the horizontal axis 103 is arranged perpendicular to the
longitudinal axis 83 of the frame 12. It will be appreciated that
the box-like construction of the frame allows the pivot axis 80 of
the control station 22, the pivot axis 94 of the first work member
18, and the pivot axis 103 of the second work member 20 to be
disposed in relation to each other to create a close-coupled work
machine in accordance with the present invention. It will be
further appreciated that the pivot axis 94 of the first work member
18 and the pivot axis 103 of the second work member 20 may be
disposed such that the axes substantially overlap.
[0042] The gauge panel 96 is shown welded to an inner surface 100
of the vertical side plates 91 and 92. The gauge panel 96 may have
cutouts 104 of varying size and configurations to accommodate the
presence of various gauges and controls.
[0043] Turning now to FIG. 3, there is shown therein a partially
cut-away view of the frame 12 shown supporting the first work
member 18. The first work member 18 is supported between the
operator's platform 89 and the power source plate 90. The first
work member 18 of FIG. 3 generally comprises the swing arm 26
pivotally connected to the frame 12 and a swing post 28 pivotally
connected to the swing arm 26. The swing arm 26 is attached to the
frame 12 by a swing arm mounting pin 106 with upper 108 and lower
110 support bushings. The swing arm cylinder 42 (See FIG. 1) is
connected to the frame 12 and the swing arm 26 and provides swing
force to the swing arm to move it about the pivot axis 94. However,
it will be appreciated that other mechanisms such as a rotary
actuator may be used to provide the swing force used to move the
swing arm 26 without departing from the spirit of the
invention.
[0044] As previously discussed, the swing arm 26 has an unimpeded
range of offset positions. The swing arm 26 arrangement of FIG. 3
is bound only by the swing arm's points of contact with the
vertical side plates 91 and 92 and by the extended and retracted
range of the swing arm cylinder 42. The pivot axis 94 of the swing
arm 26 is shown for purposes of illustration laterally centered
within the frame 12 to allow substantially the same amount of
offset left or right for the first work member 18. As will be
discussed with reference to FIG. 5, the swing arm's 26 range of
motion allows the swing arm cylinder 42 to pivot the swing post 28
and swing arm to a position beyond the left drive system 72 and/or
beyond the right drive system 74.
[0045] The swing post 28 is supported on the swing arm 26 and
pivotal about pivot axis 112. The swing post 28 may comprise
several mounting points 114 and a swing post cylinder bracket 116.
The mounting points 114 may support the work tool for operation at
the first end 14 of the frame. For example, the mounting points may
be adapted to connect the boom 30 and cylinder 36 of the backhoe
assembly to the work machine 10. The swing post cylinder bracket
116 extends laterally from the swing post 28 and provides a
connection point for the swing post cylinder 44. The opposing end
of the cylinder 44 is connected to a bracket 118 pivotally
supported on the swing arm 26. Connection of the cylinder 44 to the
swing arm 26 allows the cylinder to impart a pivot motion to the
swing post 28 relative to the swing arm to either side of the swing
arm such that the pivot motion of the swing post is not restricted
by the position of the swing arm.
[0046] Turning now to FIG. 4, the work machine 10 of the present
invention is shown from the top having the work tool 34 of the
first work member 18 in a stowed "Position A". The swing arm 26 is
positioned to the left side (operator's right when facing the first
end 14 of the frame 12) of the work machine 10 and the swing post
cylinder 44 (FIG. 3) is fully retracted. However, the swing post
cylinder 44 may be replaced with a conventional rotary actuator
swing mechanism (not shown), to increase the range of motion to the
stow position of the work tool 34 in "Position B". The "minimum
overhang" stow positions shown at Positions A and B improves the
functional utilization of the first work member 18 in space-limited
applications. The first work member 18 may be stowed with the swing
arm 26 at the opposite point in its travel, or anywhere in between.
The operator may utilize this feature to enhance the side slope
stability of the work machine 10 while maneuvering around a job
site and/or during operations of the second work member 20. It will
be appreciated that the addition of appropriate stability (slope)
sensors will allow for automatic altering of the stow position by a
control system such as described hereinafter. Alternately, a stow
position where the swing arm 26 of the first work member 18 is
aligned with the longitudinal axis 83 of the frame 12 will offer
enhanced counter-balance to the breakout force and lift capacity of
the second work member 20. As previously discussed, the swing arm
26 may be moved beyond the left drive system 72 and the right drive
system 74. However, stowing positions preferably retain the swing
arm 26 of the first work member 18 inboard of those boundaries to
maintain a narrow lateral profile for the work machine 10.
[0047] With reference now to FIG. 5, the work machine 10 is shown
from the top with the ROPS 84 cut-away. In FIG. 5 the first work
member 18 is shown in Positions C and D to illustrate the
range-of-motion of the first work member when moved by the swing
arm cylinder 42 and swing post cylinder 44. The swing arm cylinder
42 may be utilized to position and hold the swing arm 26 laterally
(left or right) anywhere within an arc of motion substantially
bisected by the longitudinal axis 83 of the frame 12.
[0048] A lock (not shown) may be provided to hold the swing arm 26
in position once set in a desired operating or stow position. A
suitable lock may be, for instance, a hydraulic or
otherwise-actuated device such as a frictional clamp (brake), a
multi-positional latch, or simply the pinning of the arm 26 to the
frame 12 or the operator's platform 89. Alternately, the swing arm
lock could be a closed-loop control system consisting of one or
more sensors to determine position of the swing arm 26, an operator
interface (not shown) for the operator to input the desired
position, and appropriate control circuitry and logic. The control
system receives the input position signal and activates the swing
arm cylinder 42 to bring the swing arm 26 to the desired position.
A "set" signal from the operator would cause the control system to
monitor the sensor output(s) and assure the arm 26 stays in
position by activating the swing arm cylinder 42 as may be required
to hold the desired position. The stored position point may also be
useful for returning the swing arm 26 to the same position time
after time. This may ease the burden on the operator in the case
where cooperative use of the swing arm cylinder 42 and the swing
post cylinder 44 is employed to position the payload discharge of
the work tool 34 (backhoe bucket) at a point of greater arcuate
reach. Suitable position sensors would include a rotary
potentiometer on the swing arm 26 or a linear motion transducer
contained on or within the swing arm cylinder 42.
[0049] In FIGS. 5 and 6, the arcuate reach of the boom 30 (FIG. 1
and thus that of the first work member 18--is illustrated as being
at least 260 degrees total, 130 degrees either side of longitudinal
axis 83 of the frame 12. This reach represents the cooperative,
combined pivotal motion of the swing arm 26 and the swing post 28
about their respective pivot axes 94 and 112. The first work member
18 comprising the backhoe assembly can create an excavation in a
desired direction within the angular bounds of Position C and
Position D, while depositing the excavated spoil at another
location within those bounds. It may also create an excavation that
is substantially parallel to the longitudinal axis 83 of the frame
12 anywhere within the bounds of Position E and Position F of FIG.
6. The lateral extent (offset) of these two positions is dependent
upon the amount of arcuate motion available to the swing post
28--through the action of the swing post cylinder 44. The offset of
Positions E and F are also dependent upon considerations related to
the swing arm 26 described below.
[0050] Referring still to FIGS. 5 and 6, the arc of motion of the
swing arm 26 about its pivot axis 94 is preferably of a sufficient
degree to allow the first work member 18 to perform its work
function(s) along a line substantially parallel to and laterally
outside of either the left 72 or right 74 drive system. At any
particular offset alignment, this is accomplished by extending or
retracting swing post cylinder 44 such that the swing post 28
rotates (positions) the work tool 34 into parallel (though offset)
alignment with the longitudinal axis 83 of the frame 12. As
illustrated in FIGS. 5 and 6, the full range of motion of the swing
arm 26 is 130 degrees of arc. This allows work to be performed
centered on a line outside of either the left drive system 72 or
the right drive system 74. Within the bounds of machine stability
considerations, the necessary amount of arc is primarily dependent
upon the overall width of the drive systems 72 and 74, the desired
lateral distance outside the drive systems 72 and 74 to perform
work, and the length of the swing arm 26. The overall width of the
drive systems 72 and 74 might be a single (fixed) value, may have
given values for each tread width available for the endless tracks,
or--for an adjustable undercarriage--may be of variable width. The
arc of motion and length of the swing arm 26, including being of a
telescoping configuration, may be determined in a tradeoff
relationship affected by other design variables, such as available
space for supported placement of the swing arm pivot axis 94.
[0051] Turning now to FIG. 7, there is shown therein the work
machine 10 of the present invention excavating a trench shown with
dashed lines 120. The trench 120 is shown offset outside the track
72 and is parallel to the digging alignment of the boom 30, the
dipper 32, and the backhoe bucket 34.
[0052] The first work member 18 may be positioned at the offset
position shown in FIG. 7 by pivotal action of the swing post 28 and
the swing arm 26. Once the boom 30 is aligned longitudinally
parallel to the longitudinal axis 83 of the frame 12 by pivotal
action of the swing post 28 and swing arm 26, the excavation
proceeds by coordinated actions of the boom 30, the dipper 32, and
the bucket 34. Discharge of spoil from the bucket 34 may be
accomplished by arcuate repositioning of the backhoe through
pivotal action of the swing post 28 or of the swing arm 26. The
combined pivotal action of the swing post 28 and the swing arm 26
may be useful in instances where one desires the spoil pile to be
further displaced from the excavation. In the illustration of FIG.
7, depositing of spoil toward the machine centerline side of the
excavation will substantially involve pivotal action of the swing
arm 26, as the swing post 28 may have limited remaining motion
available in that direction. Conversely, depositing spoil laterally
beyond the excavation will substantially involve pivotal action of
the swing post 28 since the swing arm 26 may already be in a fully
offset position. Alternate tools such as a plow (shown in FIG. 11)
may be positioned in much the same way as illustrated in FIG.
7--thus allowing the tool to operate beyond the left drive system
72 or the right drive system 74. This arrangement is advantageous
when working along an obstruction such as a wall.
[0053] Aided by the laterally offsetable first work member 18, the
work machine 10 equipped with an independently adjustable width
drive system can be "walked" sideways for close maneuvering in
tight quarters. With the swing arm 26 positioned toward the side of
the desired direction of machine sideways movement, toward the left
in this example, the backhoe bucket 34 can be pressed downward to
lift the left side of the machine 10 slightly off the ground while
the left drive system 72 is extended. At the same time, the right
drive system 74 may be extended to move the machine 10 toward the
left. The swing arm 26 may then be moved to the right (opposite)
side of the machine 10 to slightly lift the right drive system 74.
The width of the left drive system 72 may then be narrowed to move
the machine 10 an additional increment toward the left. Narrowing
the right drive system 74 at this time brings the drive system back
to its starting position or into position for another sideways
movement. A width that is simultaneously rather than independently
adjustable can also be utilized to walk the machine 10 sideways in
a similar manner. One skilled in the art can readily modify the
above procedure to accommodate the situation where the machine 10
initially has its variable width undercarriage fully extended.
[0054] Turning now to FIG. 8, there is shown therein the work
machine 10 of the present invention with an operator 122 seated at
the control station 22. The operator 122 shown in FIG. 8 may be
generally characterized as a 95.sup.th percentile male operator.
FIG. 8 illustrates the forward 2 visibility of the second work
member 20 and the loader bucket 48. The steep forward slant to the
engine compartment 76 provides the operator 122 with an
unobstructed line of sight 124 of the bucket 48 when the lift arms
50 are in the lowered position. The slant of the engine compartment
76 approximately parallels the operator's line of sight 124.
Adjustment of the operator's seat 78 would further improve
visibility. Such an adjustment is practical even for larger
operators 78 because of placement of the controls 82 on the seat,
rather than on a console. Perforating a portion of the ROPS 84
(FIG. 4) canopy provides the operator 122 with improved visibility
of the bucket 48 when the lift arms 50 are in the upper
position.
[0055] Positioning of the low-profile power source 70 in relation
to the operator's line-of sight 122 helps to achieve the
unobstructed line-of-sight illustrated in FIG. 8. Lower positioning
of the power source 70 is accomplished, in part, by driving the
left drive system 72 and the right drive system 74 at their
respective inboard rearward ends. This arrangement provides a clear
space between the forward end of the left drive system 72 and the
right drive system 74, where the lower part of the frame 12 (FIG.
2)--i.e., the vertical side plates 91 and 92 and the engine support
plate 90--can lay, as illustrated in FIG. 2. For purposes of
illustrations, forward ins the direction the operator 122 is facing
in FIG. 8. An engine-pump assembly (described hereinafter) is
disposed between the vertical side plates 91 and 92 of the frame
12, partially nested between the left drive system 72 and the right
drive system 74. The engine compartment 76 can thus be
forward-sloped for improved operator visibility-towards the second
work member 20.
[0056] Side-by-side arrangement of the engine-pump assembly (not
shown) within the engine compartment 76 shortens the engine
compartment and the second end 16 of the frame 12. The second work
member supports 56 can thus be placed further rearward on the frame
12. The shortened first 14 and second 16 ends of the frame 12 are
further complemented by a condensed central portion, made possible
by the compact length of the operator platform 89. Its compact
length is primarily the outcome of utilizing the on-seat controls
82 instead of pedestal-mounted controls for the first and second
work members 18 and 20.
[0057] Continuing with FIG. 8, the downward sloped shroud of the
engine compartment 76 is possible because the drive system
components (not shown) are mounted low within the frame 12, on the
power source plate 90 (See FIG. 2). It will be appreciated that the
power train components may comprise an engine-powered hydrostatic
pump assembly configured with an axial "stack" of two hydrostatic
pumps (one to drive each of the left drive system 72 and the right
drive system 74) and an auxiliary pump supported along side a
rearward-facing engine. The side-by-side arrangement of the engine
and hydraulic pumps shortens the engine compartment 76 and,
likewise, the second end 16 of the frame 12.
[0058] Referring now to FIG. 9, the operator's visibility of the
first work member 18 is illustrated. FIG. 9 depicts the work
machine 10 with a backhoe first work member 18 near its full
digging depth, in alignment with the longitudinal axis 83 of frame
12. The operator's unobstructed view 126 of the backhoe bucket 34
is indicated by a dashed line. The openness of the operator
platform 89 is particularly apparent with the backhoe assembly in
its lowered position. It will be appreciated that the operator's
view 126 over the operator platform 89 can be improved by
readjusting the seat 78 towards the first work member 18.
[0059] It will be appreciated that the operator's line-of-sight 126
remains substantially unobstructed when the first work member 18 is
deployed for excavating parallel to the longitudinal axis 83 of the
frame 12 outside either of the drive systems 72 and 74. Essentially
the operator's knees may comprise the only obstruction to his/her
view of the bucket 34. The work machine 10 offers unobstructed
operator visibility of the first work member 18 in any of its
possible working positions shown in FIGS. 5 and 6.
[0060] With reference now to FIG. 10, there is shown therein an
alternative configuration of the work machine 10 of the present
invention. The work machine 10 of FIG. 10 comprises the first work
member 18 having a backhoe assembly supported thereon and the
second work member 20 comprising a trencher 128 supported by the
tool carrier 46. In this arrangement, the machine 10 travels
rearward while trenching. The operator may face the operator's seat
78 in that direction, as shown. However, facing the seat 78 toward
the left or right side of the machine 10 offers improved visibility
of the trencher 128 and the path to be traveled.
[0061] It will be appreciated that one or more tools or work
members are suitable for mounting at either end of the work machine
10. Although not illustrated, one or more quick-attach mechanisms
(tool carrier adapters) could also be configured with the first
work member 18. For instance, a quick-attach mechanism could be
mounted between the dipper 32 and the rear work tool (backhoe
bucket) 34. The bucket 34 may then be quickly replaced with other
tools or work members suitable for boom-mounting. These may include
an offsetable vibratory plow, a trencher 128, and other devices
such as a compaction wheel, a vibratory compactor, or a pavement
breaker. Mounting of trencher 128 at the distal end of the dipper
32 would allow the trencher to be utilized above or below the
ground's surface, and/or at extended lateral reach.
[0062] A quick-attach mechanism 130 could also be mounted to the
swing post 28 to facilitate conversion to a more closely-coupled
but offsetable tool, such as the vibratory plow 132 shown in FIG.
11. In this case, the swing arm 26 in conjunction with the
swingable attachment frame 134 (and their hydraulic cylinders 42
and 44) provides the lateral offset capability. A lifting mechanism
(not shown), to raise and lower the plow 132, is also contained
within the attachment frame 134. A similar arrangement may be
utilized for supporting a trencher 128 from the swing arm 26.
[0063] Turning now to FIG. 12, yet another configuration for work
machine of the present invention is illustrated. In work machine 10
of FIG. 12 the second work member 20 is shown supporting a dump bed
136. The dump bed 136 is configured to be located above the engine
compartment 76 of the work machine 10. The contour of the rear
lower portion of the dump bed 138 is designed to generally follow
the contour of the engine compartment 76 and lift arms 50. This
contour and the fact that the dump bed 136 is located above the
engine compartment 76 moves the center of gravity (CG) 140 of the
dump bed closer to the CG of the work machine 10. This allows more
weight to be carried in the dump bed 136 when moving the load from
one location to another, compared to the load that could be carried
with a more normal bucket configuration (i.e., further out in front
of the machine 10). Discharge cylinders 142 provide a dumping force
to tilt the dump bed 136 to allow the material 144 contained within
to be dumped on the ground and to thus empty the dump bed 136.
During the operation of dumping, the CG 140 of the dump bed 136
moves forward. To reduce the chance of the machine 10 tipping
forward, a support plate 146 may be lowered to contact the ground
by the activation of cylinder(s) 148.
[0064] It will be appreciated that the dump bed 136 may be detached
from the unit by disconnecting the tilt arm cylinder(s) 142 and
removing attachment pins 150. In this arrangement, the dump bed 136
may be fitted with at least one removable support leg 152. The
support leg and the base of the bed 136 allow the dump bed to sit
upright on the ground. In this way the dump bed 136 could be filled
by another machine or by hand while the work machine 10 is being
used elsewhere. Alternately, the dump bed 136 could be filled by
use of the first work member 18 or second work member 20. Once
filled with material, the dump bed 136 may be picked up again by
the machine 10 and transported to another location to deposit the
material. A similar "over the engine compartment 76" configuration
could be used for some other attachments when additional weight or
bulk must be carried--for instance, a flat pallet for carrying
sacks or roofing materials, or a concrete transporter.
[0065] Various modifications can be made in the design and
operation of the present invention without departing from the
spirit thereof. Thus, while the principal preferred construction
and modes of operation of the invention have been explained in what
is now considered to represent its best embodiments, which have
been illustrated and described, it should be understood that the
invention may be practiced otherwise than as specifically
illustrated and described.
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