JPH0128089Y2 - - Google Patents

Description

[Detailed description of the invention] A. Field of industrial application This invention relates to an emergency stop device for ensuring safety when a vibrating roller moves back and forth.

(b) Prior art A travel lever that controls forward, stop, and reverse movement of the vehicle is fixed to an operating device frame that protrudes toward the rear of the vehicle by sliding motion, and a worker can control the traveling direction of the vibrating roller at the rear end of the operating device frame. Vibrating rollers for soil compaction have been widely known in the past, and are provided with a guide handle for use as a handhold for determining the soil.

With this vibrating roller, the operator operates the travel lever and guides the vehicle in the direction of travel using the guide handle. Accidents may occur where the driver gets caught between the controller frame and an obstacle such as a wall, or even if there is no obstacle, the driver is inadvertently pushed down by the controller frame and run over by the roller. Accidents were likely to occur where the vibrating roller ran out of control due to falling onto a slope and rapidly tilting forward, making it impossible for the operator to reach the operating machine frame.

An emergency stop device to prevent such accidents is such that the sliding direction of the travel lever is in the longitudinal direction of the vehicle, and the grip portion of the lever is such that when the lever is in the reverse position, the end of the grip portion extends rearward from the operating device frame. The device was invented in Utility Model Application No. 57-26409, in which the end of the grip was bent backward so that when it was in the stop position, it was located on the same line as the rear end of the operating device frame. The proposed Utility Model Publication No. 51-24081 is well known.

Of these, the latter device is an emergency stop device for power working machines in general, and has the function of stopping the vehicle when the operating lever touches the operator when moving backwards or when the operator clings to the operating lever when moving forward or backwards. has.

C. Problems to be solved by the invention However, since the stopping action of this invention when the vehicle is moving backwards is performed by the control lever coming into contact with the worker, the control frame approaches the worker's body considerably. Until then, the control lever will not operate, and depending on the running inertia, there is a drawback that the stop will not be possible in time.Additionally, if the worker falls down without touching the control lever, there is a drawback that the stop cannot be prevented. Since the stopping action during forward and backward movement is achieved by the worker clinging to the control lever, if the vibrating roller suddenly tilts forward due to the situation described at the beginning, the worker's hand may be on the control frame in the first place. Since it could no longer be reached, there was a drawback that it was impossible to hold on to it and prevent it from going out of control.

D. Means for solving the problem This invention aims to solve the problems of the conventional emergency stop device as described above. In a conventionally known vibrating roller, the travel lever that controls stop and reverse switching is fixed to a shaft, and a guide handle is provided at the rear end of the operating device frame. , an auxiliary lever for tightening and releasing the travel lever is prepared, and this auxiliary lever is slidable on the operating machine frame so that when the travel lever is tightened, the handle provided at one end overlaps with the guide handle, and when it is released, it separates. It has a structure in which the auxiliary lever is always urged to return to the overlapping release position.

E. Function The emergency stop device of this invention is such that if the travel lever is set in the forward or reverse travel position and the auxiliary lever is pulled until the handle overlaps the guide handle, the travel lever will be tightened in the travel position by the auxiliary lever, and at least the vehicle will be in the travel position. The lever is prevented from returning due to bias, and the vehicle continues to run as long as the auxiliary lever is gripped together with the guide handle.If this grip is stopped, the auxiliary lever is biased and returns to the overlapping release position, and as a result, the travel lever The tightening of the lever is released, and the travel lever is biased to return to the neutral position, thereby causing the vehicle to stop traveling.

F. Embodiment Next, an embodiment of the emergency stop device of this invention will be described based on the attached drawings.

FIG. 6 is a side view of a vibrating roller implementing the emergency stop device of this invention.

This vibrating roller 1 is a conventionally known one consisting of a vehicle body 3 having a roller portion 2 and an operating machine frame 5 protruding from the rear of the vehicle body via a guide rod 4. A guide handle 8 in the form of a grip rod is provided vertically, and a travel lever 10 and other levers necessary for operation, such as a vibration lever 9 for starting vibration, are fixed in the operating frame.

The emergency stop device of this invention is composed of a traveling lever 10 that is pivotably pivoted to the operating machine frame 5 and an auxiliary lever 20 that tightens and releases the lever (see Fig. 1). The structure is such that the travel lever is tightened by a brake mechanism which will be described in detail below.

Here, a lever connector 1 in which a travel lever 10 is fixed at its lever end within an operating machine frame 5 by a shaft P1 is shown.
1, the rod 12 is attached to the lever connector 11 so that it can freely slide in the longitudinal direction of the vehicle, and is connected to a valve for switching forward, stop, and reverse rotation of a hydraulic motor (not shown) for driving the vehicle. By locking the lever with pin P3, the vehicle moves forward by pushing the travel lever forward, stops at the neutral position, and reverses by pulling it backward (Figures 3 and 4). reference).

The lower end surface 11C of the lever connector 11 is attached to the lower end surface 11C of the lever connector 11 as the travel lever slides.
Compression coil spring 1 so that they touch in a seesaw shape
The lifting plate 13 biased in the upward direction by the guide shafts 14 and 15 is mounted on the bottom plate 6 of the operating machine frame so as to be able to rise and fall freely, and the angle of the lower end surface 11C is adjusted such that the end surface makes surface contact with the lifting plate 13. The travel lever 10 is formed to be in the neutral position when the vehicle is moved (see FIGS. 3 and 4).

Furthermore, a fan-shaped brake plate 11d is formed extending downward from the side surface of this lever connector 11 (see FIG. 5), and the braking surface of this brake plate 11d is connected to the bottom plate of the operating unit frame by a slit 6a provided in the bottom plate 6 of the operating unit frame. 6.Expose on the back side (see Figures 2 and 3).

This brake plate 11d is on the back side of the operating machine frame bottom plate 6.
A brake arm 24 and a brake receiver 25 are provided for tightening the brake plate by sandwiching the brake plate.

The brake arm 24 is fixed to the brake plate 1 by fixing one end to the operating machine frame bottom plate 6 with a pin P4.
The pad surface 24a is movable toward and away from the brake receiver 1d, and a shaft 26 protruding from one end of the brake receiver 25 is fitted into a bearing 27 fixed to the operating machine frame bottom plate 6 so as to be reciprocally movable, and a disc spring group 28 is inserted between the two. By interposing the pad surface 25a, the pad surface 25a comes into contact with the brake plate 11d with an appropriate pressing force (see FIG. 2).

In this case, the pressing force of the brake receiver 25 resists the force of returning the travel lever to the neutral position when the pad surface 24a of the brake arm 24 comes into contact with the brake plate 11d. The brake plate 11d is adjusted and set so as to tighten the brake plate 11d to such an extent that the sliding movement is not hindered.

A plate cam 23 is disposed at the other end of the brake arm 24 to press the pad surface 24a against the brake plate 11d by lever action. A shaft 21, which is inserted vertically across the shaft, is fitted and fixed (see FIGS. 3 and 4).

Arms 20a and 20b are fixed to the upper and lower parts of this shaft 21, and these two arms have a length that allows them to reach the guide handle 8 by sliding movement, and the ends of both arms have a handle shape that allows them to overlap with the guide handle 8. 2
The auxiliary lever 20 is constructed by connecting through 0c (see FIG. 4).

Furthermore, this shaft 21 is provided with a coil torsion spring 22 having one end fixed to the operating machine frame top plate 7 and the other end fixed to the arm 20a.
The auxiliary lever 20 is configured to be biased in the direction of overlapping with and separating from the guide handle 8.

If necessary, as shown in the attached drawings, the gripping portion 10a of the traveling lever 10 can be adjusted so that when the lever is in the reverse position, the gripping portion end extends beyond the operating frame, and when the lever is in the stop position, the gripping portion end is It is bent rearward so as to be located on the same line as the rear end of the operating device frame, and a guide groove 7a is provided on the operating device frame top plate 7 to regulate the sliding direction of the traveling lever 10. In this case, it may be in the shape of a crank that locks onto the stepped portion of the crank (see Fig. 1).

In this case, since the travel lever 10 needs to slide not only in the longitudinal direction of the vehicle but also in the left-right direction, a groove 11a in the left-right direction is provided in the lever connector 11,
The travel lever is fixed in this groove by a pin P2 so as to be slidable in the left-right direction (see FIGS. 4 and 5).

The emergency stop device in this embodiment operates as follows.

(a) In the state before the vibrating roller 1 starts running, the lower end surface 11c of the lever connector 11 is moved by the lifting plate 13 which is biased in the upward direction by the compression coil spring.
is pressed in a surface contact state, and the traveling lever 10 maintains a neutral state (the state shown in Fig. 4) (b) Next, when the auxiliary lever 20 is pulled until the handle 20c overlaps the guide handle 8, the shaft 21 The brake arm 24 is rotated by the fitted plate cam 23.
is pressed in the tightening direction of the brake plate 11d, and a tightening force is applied to the traveling lever.

Then, when the travel lever 10 is moved to the forward or reverse position in response to this clamping force (FIG. 3 shows the reverse traveling state), this clamping force is the force that returns the travel lever to the neutral position due to the rise of the elevator plate 13. Even if you let go of the travel lever, the travel lever will remain in the travel position.

(c) When you stop pulling the auxiliary lever 20, this lever returns to its initial position by the coil torsion spring, and as a result, the brake plate 11d is no longer tightened by the brake arm 24, and it seesaws against the lifting plate 13. The lower end surface 11c of the lever connector, which had been tilted, is pressed by the lifting plate to the surface contact position and returns to the state shown in (a).

In this case, in this embodiment, the brake receiver 25
Since the brake plate 11d is always pressed against the brake plate 11d with an appropriate pressure by a disk spring, the sudden return of the traveling lever 10 to the neutral position is alleviated by the frictional force.

G. Effects of the device This device configured as described above has the following effects.

The vibrating roller continues to run only when the auxiliary lever is gripped, and automatically stops when the auxiliary lever is no longer gripped, which closely matches the human instinct of letting go in times of danger, allowing for a reliable emergency stop.

Even if the worker falls down without touching the operating lever, a reliable emergency stop can be obtained.

While the conventional device operates after the operator frame approaches the operator's torso, the device of this invention operates before that, so even if coasting occurs, danger can be prevented.

If the vibrating roller falls into a groove or a steeply sloped surface and tilts sharply forward, the operator cannot reach the operating frame in the first place, so gripping the auxiliary lever is abandoned, and unlike conventional devices, a reliable stop is guaranteed. Since the auxiliary lever is gripped by overlapping with the guide handle that is used as a cue for the movement of the vibrating roller, even if the number of auxiliary levers is increased in addition to the movement lever, it will not be a nuisance to the movement operation and is excellent in terms of ergonomics.

Note that the effects specific to the embodiment are as follows.

The tightening force of the travel lever by the auxiliary lever is set to a level that resists the force of returning the travel lever to the neutral position, but does not interfere with the sliding movement of the travel lever by the operator, so it can be used freely even when the safety device is in place. It is easy to use because you can operate the travel lever at the same time.

Since a brake receiver is provided to constantly press the brake plate with an appropriate amount of pressure, it is possible to prevent shocks caused by sudden return of the travel lever to the neutral position.

Move the grip of the travel lever so that when the lever is in the reverse position, the end of the grip extends beyond the rear end of the operating machine frame, and when the lever is in the stop position, the end of the grip is positioned on the same line as the rear end of the operating machine frame. Since it is bent, it can also be expected to have a stopping effect when the travel lever comes into contact with the operator when going backwards.

[Brief explanation of drawings]

Fig. 1 is a perspective view of the operating machine frame showing the external appearance of the emergency stop device of this invention, Fig. 2 is a partially cutaway bottom view of the same as above, and Fig. 3 is the operating machine frame showing the internal structure of this emergency stop device. Partially cutaway side view of the part, 4th
Figure 5 is a perspective view of the main parts of the same as above, Figure 5 is a perspective view of the lever connector and brake arm from a different angle than Figure 4, and Figure 6 is a side view of the vibrating roller implementing the emergency stop device of this invention. It is. In the figure, reference numerals 1...vibrating roller, 5...operating device frame, 8...guide handle, 10...travel lever, 2
0...Auxiliary lever.

Claims (1)

[Scope of Claim for Utility Model Registration] 1. A travel lever that controls forward, stop, and reverse movement of the vehicle is pivoted to a control frame protruding from the rear of the vehicle, and a guide handle is provided at the rear end of the control frame. In the vibrating roller, the traveling lever is always urged to return to the neutral position, and on the other hand, an auxiliary lever is prepared for tightening and releasing the traveling lever, and this auxiliary lever is provided at one end when tightening the traveling lever. A vibrating roller characterized in that the handle is slidably fixed to an operating machine frame so that the handle overlaps with the guide handle and separates when released, and the auxiliary lever is always biased to return to the overlap release position. emergency stop device. 2. Utility model registration claim 1, in which the tightening force of the travel lever by the auxiliary lever is set to such an extent that it resists the force of returning the travel lever to the neutral position, but does not impede the sliding movement of the travel lever by the operator. Emergency stop device for vibrating rollers. 3. The sliding direction of the traveling lever is the longitudinal direction of the vehicle, and the gripping portion of the lever is such that when the lever is in the reverse position, the gripping portion end protrudes rearward from the operating device frame, and when the lever is in the stop position, the gripping portion end is operable. The emergency stop device for a vibrating roller according to claim 2, which is bent rearward so as to be located on the same line as the rear end of the machine frame.