JP4242709B2 - Deadman switch of walking type snowblower - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a walking type snowplow in which a limit switch attached to a deadman switch and a limit switch attached to a clutch lever are linked.
[0002]
[Prior art]
Conventionally, as shown in FIG. 12 and FIG. 13, a control handle C that controls the aircraft B at the rear of the aircraft B, and a group of operation levers disposed on an operation panel D provided on the front side of the control handle C. A walking snowplow A having E is well known. This snowplow A is equipped with an engine unit F and a hydraulic device on a body B, and is driven by a transmission (transmission mechanism) G having a hydraulic continuously variable transmission (HST) below the body B behind the engine unit F. Crawler traveling device H is equipped. On the front side of the airframe B, there is a snow removal part I capable of floating and rolling control, and a snow that extends upward from the snow removal part I and is scraped into the snow removal part I by the upper and lower augers J and blown up by the blower K. The snow throwing chute L which makes it possible to change the snow throwing direction is provided, and the snow removal work is performed as the aircraft moves forward (see, for example, Patent Document 1).
[0003]
[Patent Document 1]
JP-A-10-219642 [0004]
The operating lever group E includes a side clutch lever M for turning the aircraft to the left or right, a traveling clutch lever N for connecting / disconnecting the traveling clutch, and a continuously variable transmission lever O for switching forward / reverse, high speed / low speed continuously. In addition, a snow removing clutch lever P for turning on / off the power to the snow removing portion I, a hydraulic lever Q for tilting the snow removing portion auger up and down, left and right, a snow throwing lever R for adjusting the snow throwing distance, and other switches are provided. It has been. In addition, the emergency stop at the time of reverse operation that protrudes backward from the control handle C to stop the reverse of the aircraft in an emergency when the operator is caught between the control handle C and the rear obstacle at the time of reverse of the aircraft. A device S is provided. On the other hand, there is a known deadman clutch or deadman switch that stops the engine if the operator does not operate (hold) it with at least one hand. This deadman clutch or deadman switch stops the engine. It has become mandatory to establish.
[0005]
[Problems to be solved by the invention]
In the above conventional walking type snowplow, when a deadman switch is provided, a clip-type or string-type emergency stop switch, an emergency stop button for stopping the engine, etc. there were. However, these emergency stop switches and emergency stop buttons cannot be effective unless they are always worn on the worker's body, and the worker has trouble wearing the emergency stop switch or emergency stop button on the body. In many cases, accidents occurred without wearing them.
The present invention has been made to solve the above problems.
[0006]
[Means for Solving the Problems]
In order to achieve the above object, the present invention has the following configuration.
A. At the rear of the aircraft, a steering handle for maneuvering the aircraft, a clutch lever disposed on an operation panel provided on the front side of the steering handle, and a deadman connected to the engine and turned on and off by the operator's hand In a walking snowplow having a switch, a limit switch attached to the deadman switch and a limit switch attached to a clutch lever are linked.
[0007]
B. The engine cannot be started when at least one of the clutch lever traveling clutch or the snow removal clutch is on.
C. Even when both the travel clutch and the snow removal clutch of the clutch lever are off, the engine cannot be started when the deadman switch is on.
D. When both the travel clutch and the snow removal clutch of the clutch lever are off, the engine is not stopped even if the deadman switch is turned off.
E. When the deadman switch is off, the engine is stopped when at least one of the clutch clutch and the snow removal clutch is turned on.
F. When at least one of the clutch clutch and the snow removal clutch is on, the engine is stopped when the deadman switch is turned off.
[0008]
[Action]
A. above. ~ F. By having the configuration of (Claims 1 to 6), the deadman switch of the walking snowplow of the present invention operates as follows.
(1). By linking the limit switch attached to the deadman switch and the limit switch attached to the clutch lever, the engine stops when the clutch lever is on during snow removal or when the clutch lever is on, and if you release your hand from the deadman switch. This avoids emergency hazards.
[0009]
(2). When the clutch lever is off, the engine will not stop even if the deadman switch is turned off. When the snowplow is not performing snow removal work, the engine can be stopped even if the deadman switch is turned off. There is no need to start the engine each time the engine is stopped every time the deadman switch is turned off.
(3). By configuring the engine so that it cannot start when the clutch lever is on and when the deadman switch is on, the engine cannot be started unless the clutch lever is turned off. The risk of starting the engine is avoided, and at the same time, the deadman switch is prevented from being restrained.
(4). If the clutch lever is turned on when the deadman switch is off, the engine will stop.If the deadman switch is not turned on, the engine will stop when the clutch lever is turned on. Prevent failures due to runaway or snow removal.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be specifically described with reference to the accompanying drawings.
1 and 2, reference numeral 1 denotes a walking type snowplow, and this snowplow 1 is equipped with a crawler traveling device 3 capable of turning a pair of left and right grounds or a superstrate on the lower side of the base 2. An engine unit 4 and a hydraulic device are mounted on the base 2, and a transmission (transmission mechanism) 5 including a hydraulic continuously variable transmission (HST) (not shown) is mounted on the lower part of the base 2 behind the engine unit 4. A bar-type steering handle 6 is provided on the upper side. A plurality of operation levers 8 are arranged on an operation panel 7 provided on the front side of the steering handle 6. On the front side of the base 2, a snow removal part 9 that can be controlled to float and roll, and a snow that extends upward from the snow removal part 9 and is scraped into the snow removal part 9 by the upper and lower augers 10 and blown up by the blower 11. A snow throwing chute 12 that can change the snow throwing direction, and a shooter deflector 13 that pivots up and down to adjust the snow throwing angle on the upper side of the snow throwing chute 12 are provided. Yes,
[0011]
The rear left and right central part of the snow removal part 9 is supported by the left and right central part of the front end of the base 2 so as to be able to rotate left and right, and power is transmitted from the base 2 side to the snow removal part 9 through the rotation support part. The unit 9 is driven. A hydraulic cylinder is interposed between the rotation support portion and the base 2 in the lateral direction, and the snow removal portion 9 and the snow throwing chute 12 are controlled to rotate left and right (rolling) by the expansion and contraction operation of the hydraulic cylinder. The expansion / contraction operation of the hydraulic cylinder is performed by switching a solenoid valve (not shown) by a multi-lever 14 described later of the operation lever 8.
[0012]
The expansion / contraction and free switching of the hydraulic cylinder that rotates the snow removal unit 9 left and right (rolling) is switched between automatic and manual rolling of the snow removal unit 9 by an automatic / manual switching lever. When the rolling of the snow removal unit 9 is switched to manual, the rolling of the snow removal unit 9 is controlled by operating a switch lever provided on the top of the multi-lever 14. Further, even when the snow removal unit 9 is in the automatic horizontal state, the snow removal unit rolling control dial can be manually operated. When the manual operation is canceled, the snow removal unit 9 returns to the automatic horizontal state, and the snow removal unit 9 There is provided an automatic horizontal control device capable of performing automatic horizontal control even when the rolling control is controlled to be inclined. These controls are all performed in conjunction with an electronic control circuit. Further, the multi-lever 14 has a function of controlling the pitching of the snow removing portion 9 by a hydraulic cylinder when the side clutch is tilted to the left or right to actuate the side clutch to turn the machine body to the left or right, and to turn back and forth. Have.
[0013]
The snow removal section 9 horizontally supports the lower auger and the upper auger 10 in the auger housing 9a with the front open, and scrapes the snow that opposes as the machine moves forward to collect it from the left and right sides to the center. A blower 11 provided at the rear of the left and right intermediate parts blows up and snows through a snow throwing chute 12 and a shooter deflector 13. In addition, the snow throwing chute 12 rotates the chute rotating portion horizontally to change the snow throwing direction to the left and right, and the snow throwing angle adjusting cylinder changes the vertical angle of the shooter deflector 13 to change the snow throwing angle and distance. Adjust. Grounding sleds 9b are provided at both left and right ends of the snow removal unit 9, and the snow removal unit 9 moves in a grounding or snow-contacting state when the snow removal unit 9 is automatically or in a floating state.
[0014]
In addition to the multi-lever 14, the operation lever 8 is provided with a shift lever 15 for switching between forward / reverse, high speed / low speed, a travel clutch lever 16 for turning on / off the travel clutch, and the operation panel 7. Various switches are provided. Emergency when retreating to stop the retreat of the fuselage in case of emergency when the operator is caught between the control handle 6 and the rear obstacle (wall) when retreating the aircraft so that it protrudes backward from the control handle 6 A stop device 17 is provided.
[0015]
If the operator does not hold the grip 6a of the steering handle 6 together with the grip 6a with one hand or press (operate) from above, the engine stops and snow removal work cannot be performed. The deadman switch 18 is provided separately from the multi lever 14. When the deadman switch 18 is gripped by the operator's hand or released, the deadman switch 18 is separated from the grip portion 6a by the spring force of the spring, the engine is stopped, and the deadman switch 18 is gripped together with the grip portion 6a. In a state where it is pressed against 6a, the engine maintains the driving state.
[0016]
If the deadman switch 18 is in the form of grip levers 18a, 18a as shown in FIG. 3, the engine is maintained in the driving state by holding either of the grip levers 18a, 18a, and both levers 18a, 18a are maintained. When the grip is released, the engine may be stopped. 4 and 5, instead of the multi-lever 14 of the operation lever 8, left and right side clutch levers 19 are provided, and the operator holds the deadman switch 18 with one hand while the other hand The snow removal work may be stopped by operating the side clutch lever 19 or the snow removal part clutch lever 20 to perform the snow removal work and releasing the grip of the deadman switch 18.
[0017]
Furthermore, although not shown, instead of the deadman switches 18 and 18 in FIGS. 1 and 2, a deadman switch is provided in the grip portion (grip) of the multilever 14, while the operator is gripping the multilever 14. Snow removal work can be performed, and when the multi-lever 14 is released, the deadman switch is activated and the snow blower 1 stops running or the snow removal unit 9 stops driving so that the snow removal work is not performed. It ’s good.
[0018]
Further, as shown in FIGS. 6 and 7, the deadman switches 18 and 18 are provided as a single unit to form a deadman switch 18b having a length that can be grasped from both sides of the grip portion 6a of the steering handle 6, and a link rod 21, a return spring. The limit switch 23 of the engine unit 4 is turned on / off via the motor 22 and when the deadman switch 18b is gripped with the grip portion 6a or pressed against the grip portion 6a, the engine portion 4 continues to drive, and the deadman switch When the engine 18b is released, the engine unit 4 is stopped.
[0019]
8 and 9, the deadman switch of the present invention includes a limit switch 23a attached to the deadman switch 18 (18b), a limit switch 16a attached to the traveling clutch lever 16, and a snow removal portion clutch lever 20. The attached limit switch 20a is linked. In the control system circuit diagram connected to the engine SW of FIG. 9, the engine unit 4 activated by the cell motor SM is stopped by an engine stop solenoid 4a. The engine stop solenoid 4a is connected to a travel clutch safety starter 16b, a snow removal clutch safety starter 20b, a deadman switch anti-binding limit switch 23b, and a solenoid switch SOLSW connected via relays RE1 and RE2 via a timer T. The shooter cover switch 13a is connected to the relays RE1, RE2, and the limit switches 23a, 16a, 20a are connected in series to the relay RE1.
[0020]
With the circuit configuration described above, when the clutch levers 16 and 20 (limit switches 16a and 20a) are off, the engine unit 4 does not stop even if the deadman switch 18b (limit switch 23) is turned off. Further, the engine unit 4 can be started only when the clutch levers 16 and 20 (limit switches 16a and 20a) are off and when the deadman switch 18b (limit switch 23b) is off. Further, when the deadman switch 18b (limit switch 23a) is off, the engine unit 4 is stopped when the clutch levers 16 and 20 (limit switches 16a and 20a) are turned on.
[0021]
As shown in FIGS. 10 and 11, the deadman switches 18 c and 18 d are separately supported on a rotating shaft 25 supported between a pair of support frames 24 and 24 and a cylindrical shaft 25 a concentric with the rotating shaft 25. The deadman switch 18c is provided with a travel clutch hook pin 26, the deadman switch 18d is provided with a snow removing portion clutch hook pin 32, the wire hooks 27 are connected to both the deadman switches 18c and 18d, and the hooks 28 provided on the deadman switches 18c and 18d are linked rods. 31 is connected. Both deadman switches 18 c and 18 d are given a habit of returning to the off side by a return spring 29 and stop at the position of a stopper 30 provided on the support frame 24. The wire hook 27 and the wire connected to the wire hook 27 are attached on the operating lines of the deadman switches 18c and 18d so as to reduce the fixing force (grip force) in the ON state.
[0022]
When the deadman switch 18d is turned on, the hook 28 is pulled by the link rod 31 and rotated to a position where the traveling clutch hook pin 26 is fixed. Next, when the deadman switch 18c is turned on, the deadman switch 18c once stops. Further, when a force is applied, the deadman switch 18d rotates in an off direction within a range that can be held by hand, and both the deadman switches 18c and 18d are fixed. In this state, the deadman switches 18c and 18d remain fixed even if the left or right hand is released. To release the deadman switches 18c and 18d, either release both hands or lift one deadman switch from the grip 6a to unlock the hooks 28 and 28. Similar results can be obtained even if the deadman switch 18c is turned on first.
[0023]
In the self-propelled snowplow 1 having such a configuration, the deadman switch is gripped with one hand to be turned on, and the operation unit (clutch lever or the like) is operated with the other hand. The power from the engine unit 4 is transmitted to the transmission 5, the snow removal unit 9 and the like by various operations in the operation unit, and the two hydraulic cylinders, the chute rotating unit, the snow throwing angle adjusting cylinder, and the like are controlled. . Then, the crawler 3 is driven to run the machine body, and snow removal / snow throwing work is performed by the snow removal unit 9, the snow throwing chute 12, and the shooter deflector 13 whose angle is adjusted. During such snow removal work, the airframe is traveling at a low speed, and the belief turn or the super belief turn is performed at a low speed.
[0024]
Since the snow remover 1 of this embodiment is equipped with a deadman switch, snow removal work cannot be performed unless the deadman switch is grasped (operated) with one hand. If it becomes dangerous during the snow removal work, if the operator releases the gripping operation of the grip portion 6a of the steering handle 6 together with the deadman switch, the deadman switch is activated and the snow removal machine 1 stops the engine portion 4 Or running, or the driving of the snow removal unit 9 is stopped, so that danger can be avoided.
[0025]
【The invention's effect】
As described above, according to the deadman switch of the walking type snowplow of the present invention, the following effects can be achieved by having the configuration of claims 1 to 6.
[0026]
(1). Since the limit switch attached to the deadman switch and the limit switch attached to the clutch lever are linked, the engine will stop if you release your hand from the deadman switch when the clutch lever is on during snow removal or when moving. Therefore, emergency hazards can be avoided and safety can be ensured.
[0027]
(2). When the clutch lever is off, the engine will not stop even if the deadman switch is turned off.Therefore, if the snowplow is not performing snow removal work with the clutch turned off, the engine will not operate even if the deadman switch is turned off. Never stop. Therefore, the engine is stopped each time the deadman switch is turned off as in the prior art, so that it is not necessary to start the engine each time, and it is freed from the trouble of starting the engine, and there is no power consumption due to operating the cell motor.
(3). Since the engine is configured not to start when the clutch lever is on and when the deadman switch is on, the engine cannot be started unless the clutch lever is turned off. The risk of starting can be avoided, and at the same time, the deadman switch can be prevented from being restrained.
(4). When the deadman switch is off, the engine will stop when the clutch lever is turned on.If the deadman switch is not turned on, the engine will stop when the clutch lever is turned on, and the snow blower will run out of control. It is possible to prevent the danger that the snow removal part is driven.
[Brief description of the drawings]
FIG. 1 is a plan view of an entire snowplow provided with an operating device according to the present invention.
FIG. 2 is a side view of the same.
FIG. 3 is a partial plan view of an operating device having another deadman switch.
FIG. 4 is a plan view of the entire snowplow provided with another operating device according to the present invention.
FIG. 5 is a side view of the same.
FIG. 6 is a partial side view of an operating device including a deadman switch according to the present invention.
FIG. 7 is a partial plan view of the same.
FIGS. 8A and 8B are partial side views showing two linked deadman switches. FIGS.
FIG. 9 is a control system circuit diagram.
FIG. 10 is a partial plan view of an operating device provided with another deadman switch.
FIG. 11 is a side view of the same.
FIG. 12 is a plan view of the entire conventional snow remover.
FIG. 13 is a side view of the same.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Self-propelled snow remover 2 Base 3 Crawler traveling device 4 Engine part 4a Engine stop solenoid 5 Transmission 6 Steering handle 6a Grip part 7 Operation panel 8 Operation lever 9 Snow removing part 9a Auger housing 9b Grounding sled 10 Auger 11 Blower 12 Snow throwing Chute 13 Sway deflector 13a Switch 14 Multi lever 15 Shift lever 16 Traveling clutch lever 16a Limit switch 17 Reverse stop emergency stop device 18, 18a, 18b, 18c, 18d Deadman switch 19 Side clutch lever 20 Snow removal clutch lever 20a Limit switch 21 Link Rods 22, 29 Return springs 23a Engine limit switch 23b Deadman switch restraint limit switch 24 Support frame 25 Rotating shaft 26 Line clutch hook pin 27 wire hooks 28 hook 30 stopper 31 link rod 32 snow section clutch hook pin

Claims (6)

The rear of the fuselage, and a steering wheel for performing steering of the aircraft, the clutch lever disposed on the operation panel provided on the front side of the steering wheel, on-off operation of the engine by hand connected operation skilled in the engine to possess the deadman switch, a, and, in the clutch lever, the walk-behind snow remover in which the snow clutch lever to turn on and off the snow clutch and the running clutch lever for turning on and off the driving clutch is provided, The limit switch attached to the deadman switch and the limit switch attached to the clutch lever are linked, and when the clutch lever is on, the engine is stopped by releasing the hand from the deadman switch. Deadman switch for walking type snowblower. At least when Tsugaon is deadman switch of the walk-behind snow remover according to claim 1, wherein the engine is configured so as not to start of the traveling clutch and snow clutch of the clutch lever.   2. The deadman of a walk type snowplow according to claim 1, wherein the engine cannot be started when the deadman switch is on even when both the travel clutch and the snowplow clutch of the clutch lever are off. switch.   2. The deadman switch for a walk type snowplow according to claim 1, wherein when both the travel clutch and the snowplow clutch of the clutch lever are off, the engine does not stop even if the deadman switch is turned off. . When the dead man's switch is off, the walk-behind snow remover according to claim 1, wherein the When on at least one of the traveling clutch and snow clutch of the clutch lever engine is configured to stop Deadman switch. When at least one Tsugaon of running clutch and snow clutch of the clutch lever, the walk-behind snow remover according to claim 1, wherein the Turning off the deadman switch engine is configured to stop Deadman switch.

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