U.S. patent number 3,886,624 [Application Number 05/384,236] was granted by the patent office on 1975-06-03 for vacuum type sweeper.
This patent grant is currently assigned to Elgin Sweeper Company. Invention is credited to Eric Landesman, Donald R. Palmiter.
United States Patent |
3,886,624 |
Landesman , et al. |
June 3, 1975 |
Vacuum type sweeper
Abstract
A truck mounted vacuum type sweeper constructed for dual
operation employs identical sweeping apparatus on each side of the
machine and an extension broom which may be swiveled from one side
of the machine to the other for left hand and right hand sweeping
operations. The extension broom is mounted such that its axis of
rotation is always parallel to the pavement being swept. A control
system is provided for programming the operation of the machine and
includes means for transferring from, for example, a left hand
sweeping operation to a right hand sweeping operation by merely
operating a toggle switch. The control system further includes
means for automatically lifting the suction nozzles from the
operator of the sweeper shifts into reverse in order to prevent
damage to the nozzle supporting structure.
Inventors: |
Landesman; Eric (Aurora,
IL), Palmiter; Donald R. (Elgin, IL) |
Assignee: |
Elgin Sweeper Company (Elgin,
IL)
|
Family
ID: |
26955069 |
Appl.
No.: |
05/384,236 |
Filed: |
July 31, 1973 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
Issue Date |
|
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271684 |
Jul 14, 1972 |
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Current U.S.
Class: |
15/82; 15/87;
15/340.3; 15/354 |
Current CPC
Class: |
E01H
1/053 (20130101); E01H 1/0845 (20130101); E01H
1/056 (20130101) |
Current International
Class: |
E01H
1/00 (20060101); E01H 1/08 (20060101); E01H
1/05 (20060101); A47l 009/00 () |
Field of
Search: |
;15/82,83,87,340,354 |
References Cited
[Referenced By]
U.S. Patent Documents
Primary Examiner: Hornsby; Harvey C.
Assistant Examiner: Moore; C. K.
Attorney, Agent or Firm: Hill, Gross, Simpson, Van Santen,
Steadman, Chiara & Simpson
Parent Case Text
This is a division, of application Ser. No. 271,684, filed July 14,
1972.
Claims
What we claim is:
1. A vacuum type sweeper of the type having dual side brooms
mounted on opposite sides of a sweeper truck, a cylindrical
rotating extension broom mounted beneath the sweeper truck and
pivotable between positions wherein it is effective to sweep toward
the side brooms, two transversely spaced vacuum sweepings pickups
mounted on said frame immediately rearward of said extension broom,
said extension broom when pivoted in one position, being operable
to sweep into one of said vacuum sweepings pickups and when its
other position being operable to sweep into the other of said
vacuum sweepings pickups, means for selectively moving either
vacuum sweepings pickup from a road travel position to a sweepings
pickup position, and means for preventing uneven wear of said
extension broom including means for maintaining the axis of
rotation of said extension parallel to the surface being swept.
2. A vacuum type sweeper comprising: a vehicle frame for moving
along a surface to be swept; a rotatable extension broom for
sweeping the surface having an axis of rotation generally at an
acute angle to the path of movement of said frame; a vacuum
sweepings pickup mounted on said frame at one side of said
extension broom, means connected to said pickup for moving said
pickup selectively into a sweepings pickup position and into a road
travel position, and mounting means for said extension broom
mounting said broom in a position beneath said frame and
immediately forward of said sweepings pickup for directing
sweepings into said sweepings pickup, said mounting means including
means positioned for maintaining said axis of rotation parallel to
the swept surface.
3. A sweeper according to claim 2, wherein said means for
maintaining the axis of rotation of said extension broom parallel
comprises: pivotal connecting means connecting said extension broom
to said vehicle frame, said pivotal connecting means having a
vertical pivot axis means, a first generally horizontal pivot axis
means extending longitudinally of said vehicle frame, and a
generally horizontal pivot axis means extending transversely of
said vehicle frame, said first and second horizontal axes means
being pivotable to maintain the axis of rotation of said extension
broom parallel to the swept surface.
4. A sweeper according to claim 2, wherein said means for
maintaining the axis of said broom parallel includes means pivotal
about at least two generally horizontal axes.
5. A sweeper according to claim 4, wherein said means for mounting
said extension broom comprises an extension broom frame having
front and rear ends, said broom frame including said means pivotal
about at least two horizontal axes and at least one broom
supporting arm connected between said extension broom and said
means pivotal about at least two horizontal axes.
6. A sweeper according to claim 5, wherein said means pivotal about
at least two horizontal axes comprises a first pivot member
connected to said broom frame and extending longitudinally with
respect to said vehicle frame, a second pivot member pivotally
connected to said extension broom arm and extending transversely
with respect to said vehicle frame for movement about a transverse
axis, said second pivot member pivotally connected to said first
pivot member for movement about a longitudinal axis.
7. A sweeper according to claim 6, comprising means connected
between said broom frame and said broom arm and operable to pivot
said broom about the transverse horizontal axis between a sweeping
position and a transport position.
8. A sweeper according to claim 5, wherein said means for mounting
said extension broom further comprises a pivotal connection means
having a generally vertical pivot axis connecting the rear of said
extension broom frame to said vehicle frame.
9. A sweeper according to claim 8, comprising means connected
between said vehicle frame and said broom frame and operable to
pivot said broom about said vertical axis between positions where
the broom sweeps toward respective opposite sides of the
sweeper.
10. A sweeper according to claim 8, wherein said pivotal connection
means comprises a first member connected to said broom frame having
a vertical bore therein, a pivot pin connected to said vehicle
frame and received in said vertical bore, and means for releasably
securing said pivot pin in said bore.
11. A sweeper according to claim 8, wherein said broom frame
comprises an arcuate member carried at its front end, and said
mounting means further comprises means depending from said vehicle
frame and supporting said arcuate member in sliding
relationship.
12. A sweeper according to claim 11, wherein said arcuate member
includes stop projections thereon and said depending means includes
means for striking said stop projections to limit arcuate movement
of said extension broom frame.
Description
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to truck type vacuum sweepers and is
particularly concerned with vacuum sweepers which are constructed
for dual operation.
2. Description of the Prior Art
Vacuum sweepers which are constructed on the chassis of a truck are
well known in the art and generally include a rotating side broom
which sweeps along a curb and deposits the sweepings into a large
container carried by the truck by way of a vacuum nozzle which
trails behind the side broom. Such vacuum sweepers are generally
provided with a hydraulic system for operating the brooms, a
pneumatiac system for raising and lowering the sweeping implements
between a sweeping position and a transporting position, and a
water spray system to aid in keeping dust at a minimum. In
operation the sweeper is driven adjacent one curb and cleaning of
the opposite side of the roadway must be accomplished by another
machine or by making a second pass with the sweeper adjacent the
opposite curb.
Dual machines make it possible to sweep either side of a roadway
while traveling in one direction. Dual machines, however,
conventionally have dual controls and it is common practice for the
operator of a dual machine to swing from one side of the roadway to
the other, either in accordance with a planned sweeping schedule or
when he notices that a portion of the opposite roadway should be
swept. Heretofore, the operator of a dual machine, in order to
switch over to the opposite side of the roadway, would first
disengage or shut down all operating components on a sweeping side
of the machine, traverse the machine to the other side of the
roadway, engage the required sweeping components on the other side
of the machine and then travel that side of the roadway as
necessary to complete his sweeping operation. Needless to say, the
shutting down of one sweeping operation and the starting up of
another sweeping operation for the opposite side of the machine
requires that the operators attention be directed to machine
functions, while at the same time he must be aware of traffic
conditions and the like. This can become an inefficient and
cumbersome procedure particularly if the machine operator is
required to continuously transfer from one sweeping operation to
the other.
Vacuum sweepers employ an extension broom in order to sweep a swath
wider than that normally accommodated by the pickup nozzle. The
extension broom is operated at an acute angle with respect to the
transverse axis of the sweeper path and operates to move the
sweepings toward the suction nozzle. On dual sweepers, the
extension broom must have the capability of sweeping both for right
hand and left hand operation and must therefore be mounted so as to
swivel so that the angularity of the broom will cause the sweepings
to be moved toward the proper pickup nozzle. Heretofore, the
extension broom was suspended in such a manner that the broom was
held parallel to the level of the truck frame. Inasmuch as a
sweeper tends to load up in one side of the hopper, the weight
distribution becomes uneven on the truck from left to right. With
an uneven load, the truck spring suspension allows the truck frame
to drop on one side and with the extension broom rigidly parallel
to the truck frame, the engagement of the extension broom bristles
with the pavement is heavy on one side and light on the other.
This, of course, results in rapid wearing of the broom from a
cylindrical shape to a conical shape. After a load has been dumped
and sweeping is performed with an empty truck, the cone shaped
broom does not have full contact with the pavement. This type of
construction, therefore, leads to poor sweeping and short broom
life.
Generally, the suction nozzles on a vacuum sweeper are suspended by
a movable linkage at the front, for example a parallelogram
linkage, and are supported by caster wheels at the rear. The
suction nozzles must be lifted before the truck is operated in
reverse. Heretofore, the operator has been provided with a switch
for raising the suction nozzle prior to operating the truck in
reverse. If the operator forgets to raise a suction nozzle, or if
the suction nozzle is not raised in time before the truck is
operated in reverse and the caster wheels are still on the ground,
flat spots on the tires or tires popping off the rim would
result.
SUMMARY OF THE INVENTION
In view of the evident foregoing disadvantageous constructions of
vacuum sweepers and vacuum sweeper control systems, it is a primary
object of the present invention to provide a dual vacuum sweeper
having an integrated control system which will permit the operator
to switch from a sweeping operation on one side of the machine to a
sweeping operation on the other side of the machine by merely
operating a single switch.
Another object of the invention is to provide an integrated control
system for a vacuum sweeper which automatically raises the pickup
nozzles in response to the operator shifting the truck into
reverse.
Another object of the invention is to provide a dual vacuum sweeper
having an integrated control system which causes the single
extension broom of the sweeper to swivel from left hand to right
hand operation, and vice versa, in response to the operation of a
single toggle switch which controls the transfer of all sweeping
functions from one side of the machine to the other.
Another object of the invention is to provide an extension broom
for a vacuum sweeper which is maintained parallel to the pavement,
wears evenly and has a prolonged sweeping life in spite of uneven
loading and weight distribution transversely of the truck.
Another object of the invention is to provide a control system for
a vacuum sweeper wherein sweeping functions may be manifest in an
alterable program and the program may be selectively effective and
the functions provided on either side of a dual vacuum sweeper in
response to the simple manipulation of a single switch.
BRIEF DESCRIPTION OF THE DRAWINGS
Other objects, features and advantages of the invention, its
organization, construction and operation will be best understood
from the following detailed description of a preferred embodiment
of the invention, taken in conjunction with the accompanying
drawings, on which:
FIG. 1 is a side elevation of a truck mounted dual vacuum
sweeper;
FIG. 2 is a top view of a swivel extension broom employed in the
vacuum sweeper of FIG. 1;
FIG. 3 is a sectional elevation of the swivel extension broom
construction illustrated in FIG. 2 and taken generally along the
line III--III;
FIG. 4 is a partial sectional view of apparatus for pivotally
mounting the extension broom for movement about a vertical
axis;
FIG. 5 is a fragmentary view of apparatus for pivotally mounting
and limiting movement of the extension broom about an axis
transverse of the machine;
FIG. 6 is a fragmentary sectional view showing the pivoting
movemment of the apparatus of FIG. 5 in greater detail;
FIG. 7 is a further detail view of the apparatus of FIG. 5 taken
generally along the line VII--VII of FIG. 6;
FIG. 8 is a fragmentary pictorial view of the side broom and vacuum
nozzle apparatus as it relates to the frame of the truck;
FIG. 9 is a schematic electrical diagram illustrating an integrated
control system having means for programming the operation of the
sweeper and means for transferring the effect of the program from
one side of the sweeper to the other;
FIG. 10 is a more detail schematic illustration of relay apparatus
employed in the circuit of FIG. 9; and
FIG. 11 is a schematic diagram of the pneumatic system utilized in
conjunction with the control system of FIG. 10.
DESCRIPTION OF THE PREFERRED EMBODIMENT
Referring to FIG. 1, a vacuum type sweeper is generally illustrated
at 10 as comprising a truck 11 having a set of rear wheels 12 and a
set of front wheels 13 supporting the sweeper. The truck 11 is
provided with an operator's cab 14 which houses, in addition to an
operator, a control console for controlling the sweeping operations
of the sweeper.
The particular sweeper illustrated is a dual sweeper which includes
sweeping apparatus 15 carrried beneath and on both sides of a truck
frame 16. A hopper 17 is provided for receiving sweepings which may
be moved from the pavement by way of an extension broom 18, a side
broom 19, a suction nozzle 20 and a hose 22. Suction is provided by
apparatus mounted forward of the hopper, such apparatus being well
known in the art and not discussed in detail herein.
Inasmuch as the illustrated sweeper is a dual sweeper, a second
side broom and a second suction nozzle are mounted on the other
side of the sweeper. The nozzle 20 is supported by a trailing wheel
21, as is the corresponding nozzle on the opposite side of the
machine. While the side brooms and suction nozzles are provided in
duplicate, the extension broom serves both sides of the sweeper and
is therfore pivotally mounted for movement toward the side of the
sweeper which is performing a sweeping operation.
Referring to FIGS. 2-7, the extension broom 18 is illustrated as
comprising a weldment or frame 23 which is pivotally connected at
its rear portion at 25 to a plate 26 which is connected by a pair
of angle members 27 and a pair of angle members 28 to the vehicle
frame 16. At its forward end the frame 23 includes an arcuate
member 29 which is supported on a pair of angle shaped members 30
connected to the frame 16 by way of depending members 32 and 33. A
plate like member 31 is secured to the member 32 spaced from the
member 30, whereby the members 30 and 31 embrace the arcuate member
29. As is common practice, a flexible dust shield 34 is suspended
from the frame 23 forward of the rotating broom.
The extension broom 35 is supported by pins 36 for rotation by a
motor 55. A pair of arms 37 support the pins 36 at the forward ends
thereof and are connected to a pivot mechanism 38 at the rear ends
thereof. An air cylinder 39 is fixed to the frame 23 at 40 and has
an extensible member 41 which is connected by a link 42 to a member
43. The member 43 is connected between the arms 37 at a point which
divides the arms 37 into two portions, 24 and 52. It is readily
apparent that operation of the cylinder 39 moves the extension
broom 35 between the transport and sweeping positions.
In FIG. 2 the frame 16 has a pair of transverse frame members 44. A
longitudinally disposed member 45 is connected to the members 44. A
vertically disposed angle member 46 depends from the member 45 and
carries a plate 47. A cylinder 48 is pivotally secured to the plate
47 at one end and includes an estensible member 49 which is
pivotally connected to a member 51 of the extension broom frame 23.
Operation of the cylinder 48 therefore positions the extension
broom for sweeping in cooperation with the left side broom or the
right side broom against the respective stops 56, 57. Upon
operation of the cylinder 48, the broom frame 23 is pivoted about
the pivot 25 and the arcuate member 29 supports the forward end of
the frame 23 in a sliding relationship upon the member 30.
Referring to FIG. 4, the pivot 25 is illustrated in greater detail.
The plate 26 includes a bore 58 which has a pin 59 welded therein
so as to extend below the lower surface of the plate 26. The frame
23 includes a plate 60 having a bore 61 therein which has a ring 62
welded thereto. The inner diameter of the ring 62 is provided with
a sleeve 63 which receives the pin 59. The pin 59 includes a
threaded bore 64 for receiving a bolt 65 by way of a washer 66 and
a washer type bushing 67. As can be seen in the drawing, the ring
62 engages and moves with respect to the sleeve 63 and the bushing
67, while the pin 59, the washer 66 and the bolt 65 are located
together by a pin 68 so as to remain stationary with respect to the
vehicle frame.
Referring to FIGS. 5-7, the mechanism for maintaining the axis of
rotation of the extension broom parallel to the swept surface is
illustrated in greater detail. In FIG. 5, it can again be seen that
the arm 37 includes a forward portion 24 for connection to the
broom and a rear portion 52 for connection to the pivot 38. Each of
the arms 52 rotatably receives a respective pin 54. The pins 54 are
connected to opposite ends of a tube 89. The extension broom is
therefore pivotal about the longitudinal axis of the tube 89. The
tube 89 has connected thereto an arm 70 which carries an adjustable
stop mechanism 71 for striking a cooperable member 72 carried at
the rear end of the arm portion 52 for adjustably limiting the
downward movement of the broom to prevent excessive bristle contact
and wear. The air cylinder rod length and stroke limits the up
position of the broom.
The frame 23 includes a pair of spaced vertically disposed member
73 and 74 having aligned bores 76 and 77, respectively. The members
73 and 74 are in the form of plates and are connected between a
pair of plates 75 and 90. A member 79 is secured to the plate 74
and includes a bore 78 which is aligned with the bores 76 and 77.
The aligned bores receive a pin 80 which has a transverse bore 82
which may be aligned with a bore 81 of the member 79 for receiving
a cotter pin 83 or the like.
The elements 75-81 are located at the center of the tube 89 and, as
illustrated in particular in FIG. 7, form a second horizontal axis
of rotation for the extension broom generally longitudinally of the
sweeper at the pin 80. The plates 75, 90 include respective
recesses 91, 92 for permitting a certain amount of rotation about
this longitudinal axis. The tube 89 includes a transverse bore at
its center for receiving a cylinder 85 having a longitudinal bore
88 for receiving the pin 80. The bore 88 is countersunk at its ends
to seat and be partially defined by a pair of bearing sleeves 86
and 87.
The foregoing structure permits pivotal movement of the extension
broom about a pair of generally horizontal axes. The first
horizontal axis is the longitudinal axis of the tube 89 and the
second horizontal axis is the axis of the pin 80. Therefore, in
response to changes in transverse and longitudinal slope of the
pavement, the extension broom pivots so as to maintain its axis of
rotation at the pins 36 parallel to the pavement.
Referring now to FIG. 8, the side brush and suction apparatus for
the right hand side of a sweeper is illustrated. Inasmuch as a dual
sweeper is disclosed herein, similar apparatus is provided on the
opposite side of the sweeper as indicated by the elements 102, 104,
106 and 109. A transverse sub-frame 93 is connected across the
vehicle frame 16 and has connected thereto a pair of plates 94
which extend toward the outside of the sweeper. A safety pin 95 may
be inserted between the plates 94 and through an upwardly extending
member 110 of a side broom weldment or frame 96. The frame 96
includes a transverse bar 99 which is connected to a pair of guide
arms 100. Although not illustrated in the drawing, the guide arms
terminate in a pivot mechanism similar to that formed by the
elements 94, 95 and 110. The member 110 has a stop pin 98 extending
therefrom for abutting the bottom edge of the plates 94 to limit
upward movement of the side sweeping apparatus.
The sub-frame 93 carries a cylinder 101 which has an extensible
member 103 pivotally connected to a lever 105. The lever 105 is
pivoted at one end by means of a pin 107 and is pivotally connected
at its other end to a member 97 which is similarly attached to the
member 110. The member 97 may advantageously be in the form of a
cable or rod. Removal of air pressure from cylinder 101 causes the
frame 96 to drop down and out due to gravity to lower the side
sweeping equipment between transport and sweeping positions; the
opposite action being effected upon application of air
pressure.
The suction nozzle 20 is of generally known construction and is
supported on the surface to be swept by a trailing wheel 21. The
suction nozzle 20 is connected to and raised and lowered with the
frame 96 by means of members 113. The nozzle 20 carries a cylinder
114 having a parallelogram linkage 115 connected to a side broom
motor bracket 111. The motor bracket 111 mounts a motor 112 which
is connected to and serves to rotate the side broom 19. Operation
of the cylinder 114 is therefore effective to raise and lower the
side broom 19.
Interposed in the hose 22 between the nozzle 20 and the hopper 17
is a gate valve 118 which is operated by a cylinder 119. In
addition, the suctioon nozzle 20 includes a shutter 116 which is
connected to and opened and closed by means of a cylinder 117.
Although the foregoing side sweeping apparatus is of generally
conventional design, the control of such apparatus, particularly on
a dual sweeper, is unique and will be best understood from the
following description of FIGS. 9-11.
Referring first to FIG. 11, the pneumatic circuit for the sweeper
disclosed herein is illustrated in schematic form. The circuit
comprises a compressor 123 and a pressure tank 124 which are
mounted forward of the hopper 17. The pressure tank has connected
thereto a relief valve 125. The pressure tank 124 feeds a pair of
main pneumatic lines 126 and 127. The line 126 is associated with
the left hand side of the sweeper and with the extension broom and
the line 127 is associated with the right hand side of the sweeper.
The line 126 is connected in common to a plurality of electrically
controlled valves 128-133 which respectively control operation of
the left hand shutter cylinder 122, the left side broom cylinder
121, the left hand nozzle lift cylinder 102, the left gate valve
120, the extension broom swivel cylinder 48 and the extension broom
lift cylinder 39. The line 127 is likewise connected to a plurality
of electrically controlled valves 134-137 for controlling the right
hand shutter cylinder 117, the right side broom lift cylinder 114,
the right hand nozzle lift cylinder 101 and the right gate valve
119. The valves 128-133 and 134- 137 are electrically controlled
air valves and the operation thereof is controlled by the circuit
of FIG. 9.
Referring to FIGS. 9 and 10, an electrical schematic diagram of the
circuits for controlling sweeping operations is illustrated as
comprising a battery 146 having a negative terminal connected to
ground and a positive terminal connected to the ignition switch 147
of the sweeper. The ignition switch 147 includes an accessory
terminal 148 which serves to provide positive battery potential to
the remainder of the circuit of FIG. 9. An eight pole double throw
relay 149 includes a relay winding 150, a plurality of terminals
151L-158L connected to the left side sweeping devices, a plurality
of termainals 151R-157R connected to the right hand sweeping
devices and a plurality of terminals 151-158 which are connectable
between the left and right hand terminals by corresponding switch
contacts 161-167 (FIG. 10). The relay 149 has its contacts 161-167
normally connected in circuit with one set of terminals 151L-157L,
for example, when the winding 150 is not energized, and connected
in circuit with the terminals 151R-157R, for example, when the
winding 150 is energized. The winding 150 is connected between
ground and the accessory terminal 148 by way of the relay terminal
158 and a left hand-right hand selection switch 182. Therefore,
upon operation of the switch 182 the movable contacts 161-167,
shown connected at 160 in FIG. 10, transfer to the terminals
151R-157R.
The terminals 151L and 151R have respective side broom lights 141
and 138 connected thereto for providing light during night sweeping
operations. The terminals 152L,152R connect to nozzle water spray
valves 142 and 139. Similar water spray valves 143 and 140
associated with the side brooms are connected to the respective
terminals 153L and 153R. The aforementioned valves 128--131 and
134-137 for controlling the air supply to their respective
cylinders are respectively connected to the terminals 154L-157L and
154R-157R. It should be noted that the extension broom swivel
control valve 132 is connected to the terminal 158 for receiving
energizing power when the switch 182 is closed. The extension broom
is therefore biased toward one side of the sweeper and moved toward
the other side of the sweeper in response to closure of the switch
182. In addition, the extension broom lift control valve 133 is not
connected to the relay 149 inasmuch as transfer of sweeping
operations from one side of the roadway to the other does not
necessitate lifting of the extension broom, although this operation
may be performed as will be understood from the following
description. An electrically operated hydraulic valve 144 for
controlling extension broom rotation by means of the motor 55 and a
side broom rotation control hydraulic valve 145 are provided. The
valve 144 is commonly connected with the extension broom lift
control valve 133 and the side broom rotation control valve 145 is
connected to the terminals 155L and 155R to control the direction
of hydraulic fluid to one side broom or the other in response to
operation of the switch 182. All of the above described lights and
valves correspond to sweeping functions including illumination,
spraying, lifting and lowering, gating, swiveling and controlling
rotation. These functions may be individually selected and stored
by means of a plurality of switches mounted in a single switch
console 173.
The switch console 173 includes switches 174-181 which, with the
exception of the switch 179, are commonly connected to the
accessory terminal 148. The switch 175 is operable to store the
side broom water spray function and extends positive potential to
the terminal 153. The switch 176 is operable to extend positive
potential to the terminal 152 and store the sweeping function of
nozzle water spray. The switch 177 stores the illumination function
and is connected to the terminal 151. The switch 178 stores the
side broom lift function and is connected to the terminal 155. The
switch 180 may store the shutter lift function and is connected to
the terminal 154. The switch 181 stores the extension broom lift
function and is connected directly to the extension broom lift
valve 133 as indicated above. Generally, the console 173 is a
sweeping function programmer and the switches thereof are operable
to store sweeping functions. These functions are transferred into
sweeping operations upon transfer of the relay contacts 161-167 to
energize the selected sweeping control valves, or lights, as the
case may be.
The switch 174 is extended to the terminal 156 for automatically
controlling the nozzle lift. A relay 172 is interposed between the
switch 174 and the terminal 156, the relay being controlled in the
backup lamp circuit of the sweeper. A backup light switch 170 is
associated with the transmission shifting mechanism of the sweeper
and is operable to close and extend positive potential from the
accessory terminal 148 to the relay 172 and the backup light 171
upon operation of the relay 172, with the switch 174 closed,
positive potential is interrupted to the terminal 156 by the relay
172 to automatically lift the nozzle which is performing a sweeping
operation at the time. This feature prevents inadvertent or tardy
lifting of the nozzle by an operator and the attendant damage which
may be caused to the nozzle apparatus as mentioned in the initial
portion of the specification.
The sweeper includes a wandering hose 183 (FIG. 1) which is
connectible in communication with the hopper 17 and which is used
for picking up leaves, etc. at locations several feet beyond the
curb. In order to provide sufficient suction for the wandering
hose, it is necessary to close both gate valves 119, 120.
Heretofore, this has been accomplished by hand in an operation
wherein the operator manually closes each gate valve and opens the
valving for the wandering hose. In this circuit the switch 179
provides simultaneous operation of both gate valves from the cab in
that the switch 179 permits connection of the gate valve on one
side of the sweeper to the terminal of the relay normally
associated with the gate valve. It will be noted in FIG. 9 that the
gate valve 137 is connected to the terminal 157R and to one side of
the switch 179, and the gate valve 131 is connected to the terminal
157L and to the other side of the switch 179. Therefore, closure of
the switch 179 automatically causes closure of both gate
valves.
Although we have described our invention by reference to particular
illustrations of a preferred embodiment thereof, many changes and
modifications of our invention may become apparent to those skilled
in the art without departing from the spirit and scope of the
invention. We therefore intend to include within the patent
warranted hereon all such changes and modifications as may
reasonably and properly be included within the scope of our
contribution to the art.
* * * * *