JPH029384Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] This invention is an automatic return device for operating levers installed in various working machines such as roadbed compaction machines, and more specifically, When a danger arises in operating the aircraft, the control lever automatically returns to the neutral position and stops the aircraft when the operator releases his/her hand from the aircraft, thereby preventing the danger from occurring. Regarding the device.

[Conventional technology]

In roadbed compaction machines such as hand-guided rollers that have been widely used in the past, a worker holds a steering handle to control the direction of the machine as the machine moves, while at the same time using a steering wheel installed on the handle. It is necessary to control the forward and backward movement of the aircraft by maintaining or switching the forward and backward movement control lever in the forward or backward direction. By the way, it would be complicated for the operator to control the direction and forward/backward movement of the aircraft at the same time.
In conventional work equipment of this type, the forward/reverse operation lever is tilted in either the forward or backward direction while the machine is moving, and its tilted position is locked. It is designed so that you can only control the direction by holding the steering wheel with both hands without touching it.

[The problem that the idea aims to solve]

However, with the operating mechanism that locks the tilted position of the control lever as described above, there are cases where the operator accidentally falls down while operating the aircraft, or when the operator is reversing the aircraft without noticing an obstacle behind the aircraft. There is a problem in that when the operator is caught between the aircraft and an obstacle, the operator cannot immediately return the operating lever to the neutral position and stop the aircraft from moving forward.

Therefore, one possible solution to this problem would be to provide the control lever with a means that would automatically return the lever to a neutral state and stop the aircraft in the event of a danger. . Conventionally, such a means has been used, for example, in the automatic lever return mechanism shown in Japanese Utility Model Publication No. 33-12001 and Japanese Utility Model Publication No. 58-36590, in which a rod inserted into a cylinder is activated by a spring in the cylinder. When the rod is always held in a neutral position and is pressed in either direction forward or backward against the elasticity of the spring, when the pressing force is released, the rod automatically returns to the neutral position due to the elasticity of the spring. Such a mechanism is known.

However, in working machines such as compaction machines,
As mentioned above, while the aircraft is running, only the steering handle must be held and the operating lever must be locked in the forward or reverse position and not touched, so the automatic lever return device as described above is required. Even if you use the control lever, if you leave the control lever locked in the forward/reverse position while driving, if a danger occurs, you will not be able to touch the lever at all and simply remove your hand from the steering wheel. As a result, the problem remains that it is not possible to release the locked state of the lever in the forward or backward movement position and automatically return the operating lever to the neutral position.

[Means to solve the problem]

This invention solves the above-mentioned problems, and when a danger occurs while driving, simply by releasing the steering wheel, the operating lever that is locked in the forward or reverse position will be automatically locked. The objective is to provide an automatic lever return device that can be released and returned to the neutral position, allowing the aircraft to stop.

As a specific means for that purpose, the present invention provides a means for moving the operating lever forward and backward between the forward/backward operating lever of the machine body provided on the steering handle of a working machine such as a roadbed compaction machine and the operating wire operated by the lever. Alternatively, a lever automatic return mechanism for returning the vehicle from the reverse position to the neutral position is connected, and the lever automatic return mechanism includes a cylinder in which a rod connected to the operating lever is slidably mounted, and a cylinder in which the rod is slidably mounted. and a spring for holding the operating lever in a neutral state through a spring, and the aircraft direction handle further includes a friction abutting member disposed opposite to the operating lever at one end and a friction abutting member at the other end. an operating lever holding mechanism having a cam member for press-contacting an abutment member toward the operating lever; and a fulcrum pivoted to the steering handle so that one end can be engaged with and disengaged from the cam member of the lever holding mechanism. The device is characterized in that it is equipped with a swing lever.

[Effect]

In the device of this invention, when the forward/reverse operation lever is tilted to the forward or reverse position,
Pull up the rear end of the swing lever attached to the steering handle and hold it together with the steering handle. When the rear end of the swinging lever is pulled up, the front end of the swinging lever descends downward around the fulcrum and presses the cam member of the operating lever holding mechanism. The frictional contact member is then pressed against the side surface of the operating lever to lock the operating lever in its tilted state to the forward or reverse position. The operator controls the flight of the aircraft by holding the swing lever and steering handle, but if some danger occurs during the flight and the worker releases the steering handle, the rear end of the swing lever will drop and the front end will drop. As a result, the cam member is disengaged from the cam member, and as a result, the frictional contact member is no longer locked in pressure on the operating lever, and the frictional contact member and the operating lever are separated from each other. Therefore, the operating lever can be automatically returned to the neutral position by the spring in the automatic return mechanism and the aircraft can be stopped.

〔Example〕

Next, the automatic return device for a control lever according to the present invention will be explained with reference to an embodiment shown in the drawings. The operating lever holding mechanism 3 includes a swinging lever 25.

As shown in FIGS. 2 and 3, the automatic return mechanism 1 for the operating lever is installed in a part of the steering handle 2 of a working machine such as a roadbed compaction machine, and is equipped with a forward/reverse operating lever 4 and a lever 4 that moves the machine body. The forward/reverse switching mechanism (not shown) is interposed between the operating wire 12 and the operating wire 12 that operates the forward/reverse switching mechanism (not shown). In this lever automatic return mechanism 1, a rod 9 is swingably inserted into a cylinder 5 attached to the steering handle 2, and the outer end of the rod 9 is connected to the steering handle 2.
The control lever 4 is pivotally connected to the lower end of the operating lever 4, which is rotatably connected to the lever 4 via a support shaft 29. The cylinder 5 has a narrow opening 6 on the rear end side and the cylinder 5 on the front end side.
By fitting and screwing together a cap 7 having a smaller diameter than the inner diameter of the cylinder 5, stepped portions 8a and 8b are formed at both front and rear ends inside the cylinder 5.

The rod 9 inserted into the cylinder 5
A narrow diameter portion 10 is provided on the front end side, and the operating wire is connected to the forward/reverse switching mechanism (not shown) of the aircraft body via a flange 11 that fits into the cap 7 at the tip of the narrow diameter portion 10. 12 are connected. Further, a coil spring 13 is fitted into the narrow diameter portion 10 of the rod 9, and on the narrow diameter portions 10 at both ends of the coil spring 13,
Seat plates 14a and 14b that engage with the stepped portions 8a and 8b in the cylinder 5 are fitted so as to be able to slide on the outer peripheral surface of the narrow diameter portion. The elasticity of the coil spring 13 causes the seat plates 14 at both ends to
By pressing and engaging the rods 8a and 14b with the step portions 8a and 8b, the rod 9 is placed in the predetermined position shown in FIG. 2, and the operating lever 4 is set to the neutral position.

Furthermore, a narrow opening 6 on the rear end side of the cylinder 5
At the tip, there is a friction ring 15 made of a soft material such as urethane rubber that contacts the outer peripheral surface of the rod 9.
At the same time, an adjustment cap 16 is fitted and screwed onto the outer periphery of the narrow opening 6.
By tightening or loosening the threaded state of the rod 6 in the axial direction, the friction ring 15 presses or loosens the outer peripheral surface of the operating rod 9, thereby increasing the sliding speed of the rod 9. is configured so that it can be adjusted as appropriate.

On the other hand, as shown in FIGS. 4 and 5, the operating lever holding mechanism 3 includes a bearing 18 attached via a bracket 17 to the lower surface of the steering handle 2 on which the operating lever 4 is provided, and the bearing 18. It consists of a friction contact member 20 and a cam member 21 provided at both ends of a horizontal shaft 19 which is pivotally supported by the horizontal shaft 19 . The friction contact member 20 is made of a horizontal band-like plate having a predetermined length and placed on a side facing the operating lever 4 via a lever 22 protruding from one end of the horizontal shaft 19. The cam member 21 at the other end of the horizontal shaft 19 is comprised of a lever whose lower end projects diagonally outward. The friction contact member 20 and the cam member 21 are formed by a coil spring 23 wound around the horizontal shaft 19 in the bearing 18.
5, the friction contact member 20 is always pushed to the right and separated from the operating lever 4. Further, as shown in FIG. 4, a swing lever 25 is pivotally attached to the lower surface of the steering handle 2 via a bearing 24 so as to be swingable. This swing lever 25 has a rear end 26 on the lower surface of an end grip 27 on the steering handle 2, and a front end 28 on the lower surface of the end grip 27 on the steering handle 2.
The length of the cam member 21 is such that the rear end 26 extends to the side of the cam member 21, and normally due to its own weight or a spring (not shown), the rear end 26 descends downward as shown by the chain line in the figure, and the front end 28 is located above the cam member 21 and does not come into contact with the cam member 21. In this state, as described above, the horizontal shaft 19 is pushed to the right in FIG. 13, it is in a neutral state as shown in FIG.

When the aircraft is started and the operating lever 4 is pushed forward as shown by the solid line in Figure 3, the aircraft will travel forward, but if the swing lever 25 is pulled up to the upper position as shown by the solid line in Figure 4 at that time. , the front end 28 of the swinging lever 25 is lowered and comes into contact with the cam member 21 as shown in FIG. , and locks the forward tilted state of the lever 4. Therefore, the operator can control the steering of the aircraft without touching the operating lever 4, and only holding the end clip 27 of the steering handle 2 and the rear end 26 of the swing lever 25 with both hands. can. In this state, if the worker accidentally falls, for example, when the worker releases the end clip 27, the rear end 26 of the swing lever 25 will move downward as shown by the chain line in FIG. The front end 28 of the swing lever 25
is removed from the cam member 21, and the forward tilting lock state of the operating lever 4 by the friction contact member 20 is released, so the operating lever 4 is returned to the neutral state by the lever return mechanism 1, and the forward movement of the aircraft is automatically stopped. do.
Note that the same can be said for the case where the control lever 4 is tilted backward to move the aircraft backwards.

〔effect〕

As described above, according to the device according to the present invention, when the operating lever 4 is tilted forward or backward,
If the swing lever 25 is held together with the end clip 27 of the steering handle 2, the forward/reverse operation lever 4 can be locked in the forward/reverse state, so the operator can hold the end clip 27 of the steering handle 2 and safely operate the aircraft. steering control can be performed.

Furthermore, if a danger occurs during forward or backward movement, when the end clip 27 is released, the locked state of the operating lever 4 is automatically released and the vehicle returns to the neutral state, so that the danger can be avoided. In particular, when the aircraft is moving backwards, workers may not notice obstacles behind them.
As a result, there is a risk that the worker may become caught between the machine and the obstacle, but by installing the device of this invention, it is possible to prevent the danger that often occurs when reversing, so it is effective in ensuring the safety of this type of machine. be.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing the configuration of an automatic lever return device according to the present invention, FIG. 2 is a sectional view showing the configuration of the lever automatic return mechanism shown in FIG. 1, and FIG. 3 is shown in FIG. Sectional view showing the operating status of the mechanism, No. 4
The figure is a side view of the portion shown in FIG. 1, and FIG. 5 is a sectional view taken along the - line in FIG. 4. DESCRIPTION OF SYMBOLS 1... Automatic return mechanism of operating lever, 2... Steering handle, 3... Operating lever holding mechanism, 4... Forward/backward operating lever, 5... Cylinder, 6... Narrow mouth part, 7... Cap, 8a, 8b... Step part, 9 ...Rod, 10...Small diameter part, 11...Flange, 12...Operation wire, 13...
Coil spring, 14a, 14b... Seat plate, 15
...Friction ring, 16...Adjustment cap, 18...Bearing, 19...Horizontal shaft, 20...Friction contact member, 21...
Cam member, 23... Coil spring, 25... Rocking lever, 26... Rocking lever rear end, 27... End clip, 28... Rocking lever front end.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) Between the forward/backward operation lever provided on the steering handle of a work machine such as a roadbed compaction machine and the operation wire operated by the lever,
A lever automatic return mechanism for returning the control lever from a forward or reverse position to a neutral position is connected, and the lever automatic return mechanism includes a cylinder in which a rod connected to the control lever is slidably mounted, and a cylinder that is slidably mounted with a rod connected to the control lever. a spring for holding the control lever in a neutral state via the rod in the cylinder; and a friction abutment member disposed at one end opposite the control lever; an operating lever holding mechanism having a cam member for press-contacting the friction contact member toward the operating lever at the other end; An automatic operating lever return device characterized by comprising a swinging lever pivotally attached to a handle. (2) The automatic lever return device according to claim 1, wherein a rod sliding speed adjustment cap having a built-in friction member that is in close contact with the outer peripheral surface of the rod is fitted onto the protruding end of the rod in the automatic lever return mechanism.