U.S. patent number 3,840,271 [Application Number 05/374,075] was granted by the patent office on 1974-10-08 for tunneling machine having swinging arms carrying cutter discs.
This patent grant is currently assigned to The Robbins Company. Invention is credited to David B. Sugden.
United States Patent |
3,840,271 |
Sugden |
October 8, 1974 |
TUNNELING MACHINE HAVING SWINGING ARMS CARRYING CUTTER DISCS
Abstract
Disc cutters are mounted at the forward end of support arms
which are connected at their rear ends to a rotor which extends
transversely of the tunnel. The rotor is driven to swing the
support arms. As the arms move the disc cutters roll along arcuate
paths across the tunnel face, each with its cutting edge
penetrating into the tunnel face and cutting an arcuate kerf. The
support arms are adjustable in position to establish new paths of
travel for the disc cutters. Each disc cutter has a generally
V-shaped cutting portion adapted to exert a lateral force on the
material between a kerf being cut by such cutter and a previously
cut adjacent kerf, to in that manner fracture such material and
dislodge it from the tunnel face.
Inventors: |
Sugden; David B. (Kingston
Beach, AU) |
Assignee: |
The Robbins Company (Seattle,
WA)
|
Family
ID: |
23475165 |
Appl.
No.: |
05/374,075 |
Filed: |
June 27, 1973 |
Current U.S.
Class: |
299/31; 175/338;
299/71; 175/106; 175/373 |
Current CPC
Class: |
E21D
9/10 (20130101) |
Current International
Class: |
E21D
9/10 (20060101); E01g 003/04 () |
Field of
Search: |
;299/31,71,72,75,85,86
;175/338,373,91,106 |
References Cited
[Referenced By]
U.S. Patent Documents
Primary Examiner: Purser; Ernest R.
Attorney, Agent or Firm: Graybeal, Barnard, Uhlir &
Hughes
Claims
What is claimed is:
1. Rock cutter mechanism for a tunneling machine, comprising:
a cutter carrier mountable at the forward end of the tunneling
machine, for bidirectional swinging movement about a swing axis
that extends transversely of the tunnel;
a disc cutter including a peripheral cutting edge;
means mounting said disc cutter onto said cutter carrier radially
outwardly from the swing axis, for free rotation about an axis that
extends across the path along which the disc cutter moves during
swinging movement of the cutter carrier, with its cutting edge
directed towards the tunnel face;
motor means for driving said cutter carrier through swing strokes
to roll the disc cutter along an arcuate path across the tunnel
face, with its cutting edge penetrating into the tunnel face and
cutting an arcuate kerf therein;
means for shifting the disc cutter in position axially at the end
of a stroke of the cutter carrier, so that when the cutter carrier
is moved through its next stroke the disc cutter will be positioned
to cut a new kerf in the tunnel face which is offset from the
previous kerf cut thereby; and
wherein said disc cutter has a generally V-shaped sectional shape
at its cutting edge, whereby it exerts a lateral force on the
material between a kerf being cut by such cutter and a previously
cut adjacent kerf, to fracture such material and dislodge it from
the tunnel face.
2. Rock cutter mechanism according to claim 1, including means for
advancing the cutter carrier forwardly in the tunnel between
strokes of the disc cutter, by increments corresponding to the
depth of cut of the disc cutter.
3. Rock cutter mechanism according to claim 1, wherein said disc
cutter is swung by said motor means back and forth between two end
positions which are across the tunnel from each other and are both
located rearwardly of a plane which is perpendicular to the axis of
the tunnel and includes the swing axis of the cutter carrier, each
time through a 180.degree. cutting arc which is located forwardly
of said plane, wherein said disc cutters are within the tunnel and
make no contact with the tunnel wall when in their end positions,
and wherein said disc cutter is shifted in position axially only
when it is in an end position.
4. Rock cutter mechanism according to claim 1, including a
plurality of disc cutters mounted on said cutter carrier radially
outwardly from the swing axis, each for free rotation about an axis
that extends across the path along which it moves during swinging
movement of the cutter carrier, and each with its cutting edge
directed towards the tunnel face, so that during each stroke of the
cutter carrier each disc cutter will roll along an arcuate path
across the tunnel face.
5. Rock cutter mechanism according to claim 1, wherein said cutter
carrier comprises a rotor including support shaft means having an
axis coinciding with the swing axis, and a disc cutter support arm
having an inboard end connected to the rotor and an outboard end
onto which the disc cutter is mounted.
6. Rock cutter mechanism according to claim 5, wherein the inboard
end of the disc cutter support arm is pivotally attached to the
rotor, for swinging movement about an axis that is perpendicular to
said swing axis, and said mechanism includes means interconnected
between said disc cutter support arm and the rotor for adjusting
the disc cutter support arm in position about its axis, to in that
manner establish the path of travel of the disc cutter.
7. Rock cutter mechanism according to claim 6, including a
plurality of spaced apart disc cutters mounted on said cutter
carrier radially outwardly from the swing axis, each for free
rotation about an axis that extends across the path along which it
moves during swinging movement of the cutter carrier, and each with
its cutting edge directed towards the tunnel face, so that during
each stroke of the cutter carrier each disc cutter will roll along
an arcuate path across the tunnel face, and indexing means for the
disc cutter support arm operable to establish adjacent positions of
the disc cutter support arm the spacing of which is smaller than
the spacing of the disc cutters.
8. Rock cutter mechanism according to claim 5, wherein the motor
means for driving said cutter carrier through swing strokes is
attached to and acts on said rotor.
9. Rock cutter mechanism for a tunneling machine, comprising:
a rotor including support shaft means mountable at the forward end
of the tunneling machine, to support said rotor for movement about
a swing axis that extends transversely of the tunnel;
a pair of disc cutter support arms symmetrically mounted on the
rotor, each said support arm having an inboard end and an outboard
free end, means pivotally attaching the inboard end of each support
arm to the rotor for pivotal movement of such arm about an axis
that is perpendicular to the axis of said swing axis;
each support arm carrying at least one disc cutter which includes a
peripheral cutting edge;
means mounting each disc cutter onto the outboard end of its
support arm, for free rotation about an axis that extends across
the path along which the disc cutter moves during swinging movement
of the rotor, with its cutting edge directed towards the tunnel
face;
motor means for driving said rotor and the support arms carried
thereby through swing strokes, to in that manner roll the disc
cutters carried by the support arms along arcuate paths across the
tunnel face, with the cutting edge of each disc cutter penetrating
into the tunnel face and cutting an arcuate kerf therein;
means interconnected between each support arm and the rotor for
adjusting the support arm in angular position relative to the swing
axis, to in that manner establish the paths of travel of the disc
cutters; and
wherein each said disc cutter has a generally V-shaped sectional
shape at its cutting edge, whereby it exerts a lateral force on the
material between a kerf being cut by such cutter and a previously
cut adjacent kerf, to fracture such material and dislodge it from
the tunnel face.
10. Rock cutter mechanism according to claim 9, wherein a plurality
of disc cutters are mounted at the outboard end of each support
arm, each for free rotation about an axis that extends across the
path along which it moves during swinging movement of the support
arm, and each with its cutting edge directed towards the tunnel
face, so that during each stroke of its cutter arm each disc cutter
will roll along an arcuate path across the tunnel face.
11. Rock cutter mechanism according to claim 10, comprising a pair
of disc cutters at the outboard end of each support arm, with the
general plane of each disc cutter intersecting the swing axis at a
perpendicular and being separated from the general plane of the
other disc cutter by an acute angle.
12. Rock cutter mechanism according to claim 11, including indexing
means for the support arms operable to establish adjacent positions
of the support arms which are separated by acute angles which are
smaller than the acute angular spacing of the disc cutters.
13. A tunneling machine, comprising:
a frame movable forwardly in a tunnel;
a cutter carrier mounted onto the forward portion of the frame, for
bidirectional swinging movement about a swinging axis that extends
transversely of the tunnel;
a disc cutter including a peripheral cutting edge;
means mounting said disc cutter onto said cutter carrier radially
outwardly from the swing axis, for free rotation about an axis that
extends across the path along which the disc cutter moved during
swinging movement of the cutter carrier, with its cutting edge
directed towards the tunnel face;
motor means for driving said cutter carrier through swing strokes
to roll the disc cutter along an arcuate path across the tunnel
face, with its cutting edge penetrating into the tunnel face and
cutting an arcuate kerf therein;
means for moving the frame forwardly by increments corresponding to
the depth of cut of the disc cutter;
means for shifting the disc cutter in position axially at the end
of a stroke of the cutter carrier, so that when the cutter carrier
is moved through its next stroke the disc cutter will be positioned
to cut a new kerf in the tunnel face which is offset from the
previous kerf cut thereby; and
wherein said disc cutter has a generally V-shaped sectional shape
at its cutting edge, whereby it exerts a lateral force on the
material between a kerf being cut by such cutter and a previously
cut adjacent kerf, to fracture such material and dislodge it from
the tunnel face.
14. Rock cutter mechanism according to claim 13, wherein said disc
cutter is swung by said motor means back and forth between two end
positions which are across the tunnel from each other and are both
located rearwardly of a plane which is perpendicular to the axis of
the tunnel and includes the swing axis of the cutter carrier, each
time through a 180.degree. cutting arc which is located forwardly
of said plane, wherein said disc cutters are within the tunnel and
make no contact with the tunnel wall when in their end positions,
and wherein said disc cutter is shifted in position axially only
when it is in an end position.
Description
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to a machine for tunneling through rock or
hard earth, and in particular to a tunneling machine for forming a
relatively small size tunnel with flat side walls by use of disc
cutters.
2. Description of the Prior Art
It is old to mount a plurality of disc cutters onto a rotary cutter
head in such a manner that when the cutter head is rotated the disc
cutters will cut concentric kerfs in the tunnel face and dislodge
the material between the kerfs. An example of this type of
tunneling machine is shown by U.S. Pat. No. 3,237,990, granted Mar.
1, 1966 to Richard J. Robbins and Douglas F. Winberg.
It is also known to mount relatively small power driven, disc-like
cutterheads onto swing arms which are power driven to move the
cutterheads across the tunnel face. Examples of this type of
tunneling machine are shown by U.S. Pat. No. 3,446,535, granted May
27, 1969 to Ernest Lauber, and by U.S. Pat. No. 3,695,717, granted
Oct. 3, 1972, to Josef Birrer.
SUMMARY OF THE INVENTION
This invention relates to a tunneling machine for forming
non-circular tunnels by use of free rolling disc cutters. The disc
cutters are mounted on the outer ends of pivotal support arms which
are motor driven through a power stroke. As they move the support
arms draw the disc cutters along arcuate paths across the tunnel
face, each free rolling with its cutting edge penetrating into the
tunnel face and cutting an arcuate kerf therein.
According to an aspect of the invention, the support arms are made
to be adjustable in position laterally of the general direction of
swing, so that the arms can be repositioned to establish new paths
for the disc cutters to follow. Each disc cutter has a generally
V-shaped cutting edge capable of exerting a lateral force on the
material between a kerf being cut by it and a previously cut
adjacent kerf, to fracture such material and dislodge it from the
tunnel face.
The present invention relates to various aspects of the rock cutter
mechanism, and to a particular tunneling machine arrangement
utilizing two support arms and two disc cutters carried by each
arm, arranged to rapidly sweep across and cut a layer of material
from the tunnel face with a minimum of strokes.
These and other features of the invention will be described in
greater detail below as part of the detailed description of the
preferred embodiment, as shown in the Drawings.
BRIEF DESCRIPTION OF THE DRAWING
FIG. 1 is a side elevational view of an embodiment of the present
invention, including a solid line showing of the rock cutter
mechanism in an intermediate position and broken line showings of
such rock cutter mechanism in upper and lower positions;
FIG. 2 is a reduced scale front elevational view of the tunneling
machine;
FIG. 3 is a top plan elevational view of the tunneling machine,
showing the two disc cutter support arms in their innermost
positions;
FIG. 4 is a view like FIG. 3, but showing the two disc cutter
support arms in their outermost positions, showing the drive
mechanism for the disc cutter support and the gripper assembly in
section;
FIG. 5 is an enlarged scale sectional view of a drive mechanism for
the disc cutter support arms;
FIG. 6 is a fragmentary view of a mechanism for positioning the
disc cutter support arm, with some parts being cut away and others
being shown in section; and
FIG. 7 is a fragmentary view of a mechanism for locking a disc
cutter support arm in position.
DESCRIPTION OF THE PREFERRED EMBODIMENT
The illustrated embodiment comprises an articulated frame including
a front part 10 and a rear part 12. Frame parts 10, 12 are
connected together by upper and lower pivot pins, for pivotal
movement about a vertical axis y.
Frame part 10 is shaped to substantially conform to the
cross-sectional shape of the tunnel T. It includes a lower portion
14 which rests on the floor of the tunnel T. Frame part 12 includes
a horizontal open area 16 which is elongated axially of the tunnel.
A transverse gripper assembly 18 is received within space 16.
Gripper assembly 18 includes a pair of side wall gripping pads 20
and hydraulic means for positioning the pads 20 relative to the
side walls of the tunnel T. The hydraulic means may comprise a
cylinder 22 housing a pair of pistons 24 and piston rods 26
connecting the pistons 24 to the gripper pads 20. Hydraulic fluid
is pumped into chamber 28 (located between the pistons 24) and is
exhausted from chambers 30 (located between the pistons 24 and end
walls of the cylinder 22) for driving the gripper pads 20 outwardly
into tight contact with the side walls of the tunnel T. The flow of
hydraulic fluid is reversed when it is desired to retract the
gripper pads 20.
A pair of thrust rams 32 are interconnected between the gripper
assembly 18 and the frame part 10. The thrust rams 32 are extended
at a time when the gripper pads 20 are forced into gripping contact
with the side walls of the tunnel T, for advancing the machine
forwardly in the tunnel. Extension of the thrust rams 32 forces the
frame part 10 forwardly in the tunnel T relative to the anchored
gripper mechanism 18. As it moves frame part 10 pulls frame part 12
forwardly with it. The open space 16 about the gripper assembly 18
makes it possible for frame part 12 to move relative to the
anchored gripper assembly 18. Following completion of each
advancement stroke of the thrust ram 32, the gripper pads 20 are
retracted from the tunnel side walls and the thrust rams 32 are
retracted, for pulling the gripper assembly 18 forwardly into a new
position.
The machine is provided with hydraulically actuated positioning
shoes 34, 36, 38, 40 which are suitably manipulated for steering
the machine in the tunnel T. The machine also includes a roof
shield 42, to provide overhead support when needed.
A rock cutter mechanism 44 is located forwardly of the frame part
10. Frame part 12 supports an endless belt type conveyor 46 which
serves to pick up the rock particles which are cut from the tunnel
face TF by the mechanism 44 and delivers them onto another conveyor
mechanism 48 which trails the machine in the tunnel T.
Referring now to FIGS. 3 and 4 in particular, a transverse fixed
shaft 50 is supported at its ends by frame members 52 which extend
forwardly from the frame of part 10. Shaft 50 includes a stationary
central pinion 52 which meshes with a pair of reciprocating racks
56 (FIG. 5). Pistons 58, 60 are connected to the opposite ends of
each rack 56. The pistons 58, 60 are mounted to travel within
cylinders 62, 64 which are attached to a rotor housing 66. A pair
of bearing assemblies 68 mount the rotor 66 for rotational movement
about the fixed shaft 50. As will be apparent, when fluid pressure
is introduced into each chamber 70 (FIG. 5) and relieved from each
chamber 72, the racks 56 are moved endwise in the direction
indicated by the arrows in FIG. 5. Since the pinion 54 is fixed,
such movement of the racks 56 causes the rotor assembly 66 to
rotate about the pinion 54 in the direction indicated by the arrow
R. Rotation of the rotor assembly 66 in the opposite direction is
accomplished by reversing the racks 56. This type of drive
mechanism is well known and therefore will not be described in any
greater detail. An example of this type of drive is disclosed in
some detail by U.S. Pat. No. 2,844,127, granted on July 22, 1958 to
Carl Steiner.
According to one aspect of the invention, a pair of disc cutter
support arms 74 are pivotally connected at their rear ends to the
rotor assembly 66. These support arms 74 are pivotally mounted for
pivotal movement about axes 75 which are perpendicular to the axis
of rotation of the rotor assembly 66. Double acting linear
hydraulic cylinders 76 are interconnected (by pivot pin means)
between a support 78 affixed to the rotor assembly 66 and ears 80
attached to the support arms 74. An articulate tooth bar 82 is
supported in the rotor assembly 66. It includes forwardly extending
teeth 84 which are provided to be engaged by similar teeth 86
carried by a lock piston 88. Each piston 88 includes a piston head
90 which is received within a piston chamber 92 carried by a disc
cutter support arm 74. Fluid pressure is introduced into a chamber
94 and is relieved from a chamber 96 when it is desired to retract
the piston 88, to disengage lock teeth 86 from teeth 84. When this
is done, the linear hydraulic motor 76 is operated to swing the
support arm 74 into a new position. Then, pressure is introduced
into chamber 96 and relieved from chamber 94, for extending piston
88 to in turn move the lock teeth 86 into engagement with a new set
of the teeth 84 on bar 82.
According to one aspect of the invention, each support arm 74
carries a pair of disc cutters 98 at its forward end. Each disc
cutter 98 may be of the overhung type and is supported for free
rotation about its own support shaft 100. Preferably, each disc
cutter 78 has a continuous peripheral cutting edge 102 which is
flanked by a pair of conical "breaker" surfaces.
A rake type mechanism 106 may be attached to the rotor assembly 66
in a position to lead the disc cutters 98 as they travel through a
downward and rearward stroke. The function of the mechanism 106 is
to draw or rake the cuttings rearwardly onto the pickup conveyor
46.
The operation of the illustrated embodiment will now be
described.
Let it be assumed that the two support arms 74 occupy their
innermost positions (FIG. 3) and are in the lower position shown by
broken lines in FIG. 1, and the machine has just been advanced
forwardly an amount equal to the depth of cut of the disc cutters
98. The drive mechanism 54, 56, etc. is operated to swing both arms
74 upwardly together. As such arms 74 move they draw with them the
disc cutters 98. The generally V-shaped peripheral portions of the
disc cutters 98 penetrate into the tunnel face Tf and cut kerfs in
such face TF as they move. The disc cutters 98 independently rotate
freely about their individual axes as the arms 74 move them. The
disc cutters are moved along arcuate paths (see FIG. 1) which are
about 200.degree. in length. The end positions (the uppermost and
lowermost positions in the illustrated embodiment) of the disc
cutters 98 are located rearwardly of the transverse plane y in
which the rotational axis of shaft 50 is situated. When the disc
cutters 98 are in their end positions they are inwardly of the
tunnel from the tunnel wall and can be shifted in position axially.
When the cutters 98 are being swung through the 180.degree. arc
forwardly of plane y they are in curve cutting contact with the
tunnel face.
When the arms 74 are in their uppermost positions (shown by broken
lines in FIG. 1) the disc cutters 98 are within a full width
portion of the tunnel. The lock pistons 88 are retracted and then
the linear hydraulic motors 96 are retracted an amount sufficient
to swing the arms 74 laterally outwards by the angular amount a
(FIG. 3). The lock pistons 88 are then extended to lock the arms 74
in their new positions. Then, the drive mechanisms 54, 56, etc. is
driven in the opposite direction to swing the arms 74 downwardly
and in so doing draw the disc cutters 98 along new arcuate paths
which are sufficiently close to the previously formed kerfs that
the V-shaped cutting portions of the disc cutters 98 will dislodge
the material between the new and old kerfs.
When the arms 74 have reached the lower end of their movement they
are again adjusted outwardly another angular amount a. Then, the
arms 74 are driven upwardly again so that the disc cutters 98 will
cut a new set of kerfs. This procedure is repeated until the arms
74 finish a stroke while in their outermost positions (FIG. 4).
According to an aspect of the invention, each support arms 74
carries a pair of disc cutters 98 which are spaced apart by an
angular distance which is a multiple of the angle a. Such distance
is equal to a plus a times the number of strokes through which each
arm 74 must travel between the start of cut when the arms are in
the position shown by FIG. 3 and the end of cut when the arms are
in the position shown by FIG. 4. In the illustrated embodiment the
disc cutters 98 of each pair are spaced four units a apart and
three strokes are necessary to complete one complete sweep of the
tunnel face TF. After a complete sweep of the tunnel face TF the
machine is advanced forwardly again an amount equal to a new depth
cut of the disc cutters 98.
Although the invention has been described in a preferred form with
a certain degree of particularity, it is to be understood that the
present disclosure of the preferred form has been made only by way
of example and that numerous changes in the details of construction
and the combination arrangement parts may be resorted to without
departing from the spirit and scope of the invention as hereinafter
claimed.
* * * * *