JPH0249098Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) The present invention relates to a self-propelled wheel device that can be attached to a small transporter equipped with a battery for driving a lifting platform up and down, etc. ,
The present invention relates to a self-propelled wheel device for a small transport machine that can be attached in place of the casters of the transport machine.

(Prior Art) A small transport machine such as a small forklift used to transport relatively lightweight items within a factory etc. usually has a Equipped with an elevating platform such as an elevating fork stand. The lifting platform is raised and lowered manually or by a hydraulic device driven by an electric motor. Therefore,
In the case of a small transport machine equipped with a motor-driven lifting platform, a battery is mounted on the machine frame.

On the other hand, the traveling operation of such a small transporter is usually performed manually. For this purpose, casters are attached to the fuselage frame. The caster is supported on the fuselage frame by a vertical pivot axis so that its direction can be changed, and is generally detachably attached to the fuselage frame.

By the way, in the case of a small transport machine equipped with a battery as described above, attempts have been made to make the transport machine self-propelled by utilizing the battery. For example, in Utility Model Publication No. 53-15068,
A motor driven by a battery mounted on the transporter and wheels driven by the motor are supported by a support bracket, and the support bracket is connected to the fuselage frame by a vertically extending control handle shaft. A self-propelled wheel device is shown that is supported so as to be able to change its direction.

(Problems to be Solved by the Invention) However, such a self-propelled wheel device is designed to be attached completely separately from the caster. In particular, in the model shown in the above-mentioned publication, the wheel device is supported on the aircraft frame by the control handle shaft, so in order to attach the wheel device, there is a special Wheel supports shall be provided.

For this reason, conventionally, even if the loading capacity is the same for small transporters, self-propelled and hand-propelled transporters have had to have different body frames.

The present invention was developed in view of these circumstances, and its purpose is to enable the same body frame to be applied to both self-propelled transporters and hand-push transporters. .

In other words, an object of the present invention is to obtain a self-propelled wheel device that can be attached to a small-sized transport machine to which casters are attached instead of the casters.

(Means for Solving the Problem) In order to achieve this objective, the present invention provides a support bracket that supports the motor and wheels of the self-propelled wheel device with a pivot axis similar to the vertical pivot axis of the caster. That's what I do. The support bracket has a position apart from the axis of the pivot.
A control handle is attached to rotate the support bracket around the pivot axis.

(Function) With this configuration, it is possible to attach either the pivot shaft of the caster or the pivot shaft of the support bracket of the self-propelled wheel device to the caster support section provided on the body frame of the transporter. Become. In other words, the transporter can be changed to either a self-propelled type or a hand-push type.

And when a self-propelled wheel device is installed,
By operating the steering handle, the direction of the wheels can be changed and the transporter can be steered.

(Example) Hereinafter, an example of the present invention will be described using the drawings.

In the figure, FIGS. 1 and 2 are a side view and a rear view of an embodiment of the self-propelled wheel device according to the present invention, and FIG. It is a perspective view showing the whole structure. Also,
FIG. 4 and FIG. 5 are longitudinal cross-sectional views showing the caster and the self-propelled wheel device, respectively, in a state where they are attached to the transporter.

As is clear from FIG. 3, this transporter 1 is configured as a small forklift, and the front wheels 2, 2 and the rear wheels 3, 4 form a body frame 5.
is supported almost horizontally. A mast 6 is erected on the body frame 5. A fork stand 7, which is an elevating stand, is slidably supported on the mast 6, and by expanding and contracting a hydraulic cylinder 8, a pulley 8a attached to the tip of the fork stand 7 is slidably supported.
is raised and lowered, and the fork stand 7 can be raised and lowered via the chain 9. This hydraulic cylinder 8 is driven by a battery 10a in a control box 10 mounted on the body frame 5, a hydraulic pump (not shown), and the like.

One of the rear wheels 3 and 4 is a caster 11, and the other is a self-propelled wheel device 12. Caster support parts 13, 13 capable of supporting the caster 11 are provided at both rear ends of the body frame 5.

As shown in FIG.
The support bracket 15 rotatably supports the wheel 3 by the axle 14, and the support bracket 1
A pivot shaft 16 vertically installed at the center of the horizontal part of 5
By fitting the pivot shaft 16 into the bearings 13a and 13b provided on the caster support portion 13 of the fuselage frame 5,
It is designed to be supported around the axis of the pivot shaft 16 so that the direction can be changed freely. A clip 17 latched to the upper end of the pivot shaft 16 allows it to be removably attached to the fuselage frame 5. Furthermore, a brake rod 18 is slidably fitted into the center of the pivot shaft 16. The brake rod 18 has a spring 1
9, and the upper end of the brake pedal 20 is engaged with the brake pedal 20. This brake pedal 20 is rotatably supported by a bracket 5a of the aircraft frame 5, and its rotation causes the brake rod 18 to be rotated.
The upper end of the brake shoe 18a is pressed downward, and a brake shoe 18a provided at the lower end contacts the wheel 3 to perform a braking action.

On the other hand, as shown in FIG. 5, the self-propelled wheel device 12 has an axle 22 that rotatably supports the wheel 4 fixed to a support bracket 21.
A flat motor 23 is attached to one end, and a reducer 24 is attached to the other end.
The motor 23 rotates the wheels 4 via a speed reducer 24. The wheels 4 have the same diameter as the wheels 3 of the caster 11, and a pivot shaft 25 similar to the pivot shaft 16 of the caster 11 is provided at the center of the horizontal portion of the support bracket 21. In this way, like the caster 11, the self-propelled wheel device 12 has its pivot shaft 25 fitted into the caster support portion 13 of the body frame 5, so that the self-propelled wheel device 12 can be attached in a detachable and changeable direction. Further, a brake rod 26 is slidably fitted to the pivot shaft 25, and the wheels 4 are similarly braked by operating the brake pedal 20.

As shown in FIGS. 1 and 2, the support bracket 21 of this self-propelled wheel device 12 has
One end of a control handle 27 is connected to the rear end portion remote from the pivot shaft 25 by a horizontal shaft 28 so as to be freely rotatable in the vertical direction. This control handle 2
7 has a hollow handle shaft 29 and an operating section such as a grip 30 provided at the tip of the handle shaft 29. In this embodiment, a control box 31 is attached to the tip of the handle shaft 29. Grips 30 are attached to both sides of the handle. This control box 31 is connected to the self-propelled wheel device 1.
It controls the motor 23 of No. 2, and has a forward switch 32a, a reverse switch 32b, etc. on its top surface.
In addition, a key switch 33 etc. is provided on the side, and the internal relay 33 is activated by each operation.
4 etc. are activated, and the motor 23 is controlled. The control box 31 is further provided with a horn switch 35 and a horn 36 operated by the switch 35.

A terminal 37 is provided on the outer surface of the lower end of the handle shaft 29 of the operating handle 27, and an electric wire 38 is wired inside the handle shaft 29 to connect the terminal 37 and a control device in the control box 31. has been done. The terminal 37 is connected to the battery 10a and the motor 23, respectively.

The steering handle 27 is always biased to remain vertical by a spring 39 provided around the horizontal axis 28 at its lower end.

Transport machine 1 equipped with such a self-propelled wheel device 12
When running the vehicle, grip the grip 30 of the control handle 27, tilt the control handle 27 at an appropriate angle, and turn on the key switch 33 of the control box 31. Then, the forward switch 32a or the reverse switch 32b is operated. Then,
The motor 23 of the self-propelled wheel device 12 is rotated forward or reverse by a battery 10a mounted on the body frame 5, and the wheels 4 are driven to rotate forward or backward via the reducer 24. Therefore, the transporter 1 moves forward or backward. During this time, operate the control handle 27 to move the support bracket 21 to the rotation axis 2.
5 and adjust the direction of the wheel 4 as appropriate. Thereby, the transporter 1 can be moved forward or directionally changed. At this time, the caster 11, which is the other rear wheel,
Rotate around and follow that direction. When the forward and backward switches 32a and 32b are turned off, the transporter 1 stops.

In this way, by providing the control box 31 near the grip 30, which is the operation part of the control handle 27, operations such as forward and backward movement and steering operations can be performed at a nearby position, making the operation easy. becomes. In addition, the wiring for the control box 31 is
By using the electric wire 38 inserted into the inside of the handle shaft 29, the control handle 2
The electric wire 38 will not become tangled during operation of 7, and its appearance will be good.

When the transporter 1 does not need to be self-propelled, the rear wheels 3 and 4 are both casters 1.
1 may be used. Moreover, if both the self-propelled wheel device 12 and the caster 11 are prepared, one transporter 1 can be made into a self-propelled type or a hand-push type as needed. In that case, the self-propelled wheel device 12 or caster 11 can be removed by simply removing the clip 17 and pulling out its pivot shaft 25 or 16 from the caster support portion 13 of the fuselage frame 5, or replace it with a replacement caster 11 or caster 11. It can be assembled by simply fitting the pivot shaft 16 or 25 of the self-propelled wheel device 12 into the caster support portion 13 and locking it with the clip 17. Therefore, the replacement work becomes extremely easy.

The self-propelled wheel device 12 incorporates the control box 31 for the motor 23 as well as the control handle 27 for controlling the direction of the wheels 4 as one unit, making the transporter 1 self-propelled. Even in such a case, once the self-propelled wheel device 12 is attached to the body frame 5, all that is required is to perform wiring between the self-propelled wheel device 12 and the battery 10a mounted on the body frame 5. That is, there is no need to provide any control equipment for the motor 23 on the fuselage frame 5. Therefore, the fuselage frame 5 can be exactly the same as that of the manual push type.

In the above embodiment, a small forklift is taken as an example of the transporter 1, and the motor 23 of the self-propelled wheel device 12 is driven using the battery 10a that drives the elevating fork platform 7 up and down. However, the present invention is applicable not only to such small forklifts, but also to various small transport machines that are equipped with a crane, conveyor, etc. driven by a battery, and are moved by casters. It can be applied to things.

Further, in the above embodiment, the control handle 2
Although the grip 30 serving as the operating section of the control box 7 is provided on the side surface of the control box 31, such a grip 30 may be provided directly on the handle shaft 29 of the operating handle 27.

(Effects of the invention) As is clear from the above description, according to the invention, the support bracket that supports the motor and wheels of the self-propelled wheel device is provided with a pivot axis similar to the vertical pivot axis of the caster. The steering handle is attached to the caster support portion of the aircraft frame by the pivot axis, and the steering handle, which steers the transporter by changing the direction of the support bracket, is attached to the support bracket at a position different from the pivot axis. Since the self-propelled wheel device that can be steered can be attached to the body frame of the hand-pushed transporter to which the casters are attached, the steerable self-propelled wheel device can be attached. That is, it becomes possible to use the same body frame for both the hand-pushed transporter and the self-propelled transporter. Furthermore, if both casters and self-propelled wheel devices are prepared, one transporter can be used as either a hand-push type or a self-propelled type as needed.

[Brief explanation of the drawing]

Fig. 1 is a side view showing an embodiment of the self-propelled wheel device according to the present invention, Fig. 2 is a rear view of the self-propelled wheel device, and Fig. 3 is a transport machine equipped with the self-propelled wheel device. FIG. 4 is a perspective view showing an example, and FIG. 4 is a vertical cross-sectional view of the main part showing the state in which the caster is attached to the transporter, and FIG. 5 is the state in which the self-propelled wheel device is attached to the transporter. FIG. 5 is a longitudinal cross-sectional view similar to FIG. 4; 1... Transporter, 3, 4... Rear wheels (wheels), 5...
...Aircraft frame, 7...Elevating fork stand, 10...
...Control box, 10a...Battery,
11... Caster, 12... Self-propelled wheel device, 13
... Caster support part, 15 ... Support bracket,
16...Swivel axis, 17...Clip, 21...Support bracket, 23...Motor, 24...Reducer, 25...Swivel axis, 27...Control handle, 2
9...Handle shaft, 30...Grip (operation part),
31...Control box, 38...Electric wire.

Claims (1)

[Claims for Utility Model Registration] (1) The fuselage frame 5 is provided with a caster support portion 13 capable of fitting and supporting the vertical pivot shaft 16 of the caster 11, and by the caster support portion 13,
A small transporter 1 is provided with a caster 11 that can be freely changed in direction and removably attached to it.
A self-propelled wheel device that can be attached in place of the caster 11, which includes: a motor 23 driven by a battery 10a mounted on the transporter 1; a wheel 4 driven by the motor 23; and a support bracket 21 for supporting the wheels 4, a pivot shaft 25 fitted to the caster support portion 13 of the fuselage frame 5, and a pivot shaft 25 attached to the support bracket 21 at a position away from the axis of the pivot shaft 25. A self-propelled wheel device for a small-sized transporter, comprising: a control handle 27 that is capable of rotating the support bracket 21 around the axis of the pivot shaft 25 thereof. (2) Near the operating portion 30 of the control handle 27,
A control box 31 for the motor 23 is provided, and the wiring for the control box 31 is routed through the inside of the hollow handle shaft 29 of the operating handle 27. Self-propelled wheel device for the small-sized transporter described.