JPS624056Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a braking device for a hand truck, and more particularly to a braking device attached to a hand truck for transporting baggage and the like.

Conventional hand trucks are generally not equipped with a brake, but are known to be equipped with a simple stopper. In such a stopper, a stop member having, for example, a U-shaped cross section is rotatably attached to the axle of the caster, and the stop member is manually brought into contact with the wheel to stop the back and forth movement of the caster. .

However, such a stopper is for preventing movement of a hand truck once it has stopped, and is not designed to apply a brake to a moving hand truck to stop it.

Furthermore, even when the stopper was activated, movement in either the forward or backward direction was unavoidable, making it difficult to ensure the accuracy of the stopping position or stability when stopped.

By the way, in this type of hand truck, when the worker stops the hand truck and lifts or lowers a load, in order to improve the work efficiency and ensure stability, when the brake handle is released, the wheels are automatically activated. It would be reasonable to ensure that the hand truck stops when the brakes are applied, and that when the brake handle is operated in the brake release direction, the brakes on the wheels are released and the hand truck can be moved.

The purpose of this invention is that when a worker releases the brake handle when loading or unloading cargo, the brakes are automatically and reliably applied to prevent the wheels from moving forward or backward, and the hand truck is stopped. Even if rotational force acts on the wheels in the direction of moving them forward or backward while the hand truck is stopped, the wheels can be strongly braked. 1. To provide a braking device for a hand truck in which a second brake shoe is reliably operated synchronously in the direction in which the brake is applied to the wheel and in the direction in which the brake is released.

In order to achieve the above object, this invention has first and second wheels, each having a U-shaped cross section, at the front and rear of a caster wheel rotatably supported by a bracket.
A second brake shoe is arranged, and the first and second brake shoes are arranged.
One end of the first and second arms is attached to the brake shoe of the brake shoe, the other end of the first and second arms are connected to the bracket by a common pin, and the first and second arms One ends of the third and fourth arms are connected in the middle of the length direction of the third and fourth arms.
The other end of the fourth arm is connected to the operating rod by a common pin, and the first and second brake shoes are connected through the operating rod, the third and fourth arms, and the first and second arms. , an elastic body is provided that always pushes the wheels in the direction of applying braking, and a brake handle is connected to the operating rod to operate the first and second brake shoes in the direction of releasing the braking against the elastic body. It is characterized by its structure.

Examples of this invention will be described below with reference to the drawings.

Fig. 1 is a side view of a hand truck to which the braking device of this invention is applied; Fig. 2 is a partially cutaway enlarged side view showing details of an embodiment of this invention disposed on the rear caster of the hand truck; The figure is the second
FIG. 4 is a perspective view showing the relationship between the wheel, the first and second brake shoes, and the members attached thereto.

The hand truck shown in FIG. 1 includes a loading platform 1, a pair of swivel casters 2 attached to the lower front of the loading platform 1, a pair of fixed rear casters 3 attached to the lower rear of the loading platform 1, and a pair of swivel casters 2 attached to the lower front of the loading platform 1. It includes a handle 4 for a hand truck erected on the upper part of the cargo platform where the rear caster 3 is located, and a braking device provided along the handle 4.

As shown in FIG. 3, the rear caster 3 has a shaped bracket 5 when viewed from the front, and a wheel 6 disposed inside the bracket and rotatably supported on a shaft 19.

The braking device is arranged with respect to the rear caster 3 in this embodiment. This braking device includes first and second brake shoes 7C and 7D.
and the first and second arms 7A, 7B and the third and fourth arms.
the arms 8A, 8B, the connecting rod 10 and the rod 9 constituting the operating rod, the compression spring 11 as an elastic body provided in the spring retainer 17, and the handle 4 provided in the hand truck. A brake handle 20 is provided.

Said first and second brake shoes 7C, 7D
As shown in FIG. 4, the cross section (horizontal cross section) is formed into a U-shape. In addition, the first and second brake shoes 7C and 7D are located in front of the wheels 6,
It is arranged at the rear so that braking can be applied from both sides of the wheel 6 in the front and rear directions.

One ends of the first and second arms 7A and 7B are integrally attached to the first and second brake shoes 7C and 7D. The other ends of the first and second arms 7A and 7B are overlapped with each other,
It is connected to the bracket 5 of the rear caster 3 by a common pin 12, and the first and second arms 7A, 7B are connected to be swingable about the pin 12 as a fulcrum. The first and second arms 7
A, 7B has connecting members 13 at positions closer to the first and second brake shoes 7C, 7D in the length direction.
A and 13B are attached integrally.

One ends of the third and fourth arms 8A, 8B are connected to the connecting member 13 by pins 14A, 14B.
A, 13B. Also, the third and fourth
The other ends of the arms 8A, 8B are overlapped with each other and connected to one end of the connecting rod 10 by a common pin 15.

A nut 16 is provided at the other end of the connecting rod 10, and one end of the rod 9 is connected to the connecting rod 10 via the nut 16. This rod 9 extends straight upwardly along the vertical portion of the hand truck handle 4, as shown in FIGS. 1 and 2. Further, at the other end of the rod 9, a stopper 18 having a larger diameter than the rod 9 is provided.
are integrated.

As can be seen from FIG. 2, the spring presser 17 has a diameter larger than that of the operating rod and has a vertical cross section shaped like a mold. This spring retainer 17 is arranged so as to surround the connecting portion between the operating lever link 10 and the rod 9, and is fixed to the ceiling plate of the bracket 5 of the rear caster 3.

The compression spring 11 is attached around one end of the rod 9, and is connected to the ceiling plate of the spring holder 17 and the nut 1.
It is interposed between 6. The spring force of the compression spring 11 is applied to the first and second arms through the nut 16 → connecting rod 10 → third and fourth arms 8A, 8B → connecting members 13A, 13B → first and second arms 7A, 7B
It is transmitted to the brake shoes 7C and 7D of the first and
The second brake shoes 7C and 7D are always pushed in the direction of applying braking to the wheels 6 by the spring force of the compression spring 11.

The brake handle 20 is connected by a pin 22 to a hand truck handle 4. One end of the brake handle 20 is latched onto a stopper 18 provided on the rod 9. The other end of the brake handle 20 is attached to a scissor-shaped angle so that it can be gripped together with the grip portion of the hand truck handle 4 to easily operate the operating rod.

The hand truck braking device of the embodiment described above operates and functions as follows.

That is, when the operator releases the brake handle 20, as can be understood from FIG. has been done.

When the connecting rod 10 is pushed in the direction of arrow a, the third and fourth arms 8A, 8B and the connecting member 13
A, 13B through the first and second arms 7A, 7
B are pushed into each other with the pin 12 as a fulcrum.

When the first and second arms 7A and 7B are pushed toward each other, the first and second brake shoes 7C and 7D are pushed toward the front and rear of the wheels 6, and the wheels 6 The brakes are applied and the hand truck is stopped.

In this state, when a clockwise rotational force as shown by arrow b in FIG. 2 is applied to the wheel 6, the friction force between the wheel 6 and the first brake shoe 7C causes the first brake shoe 7C to is pulled in the direction in which the rotational force of the wheel 6 acts, that is, clockwise in FIG. At this time, the first arm 7A
2 as a fulcrum and swings in the direction of arrow d. and,
Since the first brake shoe 7C has a U-shaped cross section, it bites into the wheel 6 from the outside to the inside as the first arm 7A swings in the direction of arrow d. As a result, the wheels 6 are strongly braked.

Therefore, when a clockwise rotational force is applied to the wheel 6 in FIG. 2, strong braking is applied by the first brake shoe 7C.
The wheels 6 do not rotate, and the hand truck can be reliably stopped at a fixed position.

Further, when a rotational force in the counterclockwise direction shown by arrow c in FIG. 2 is applied to the wheel 6, the friction force between the wheel 6 and the second brake shoe 7D causes the second brake shoe 7D to It is pulled in the direction of the rotational force. At this time, the second arm 7B swings in the direction of arrow e in FIG. 2 using the pin 12 as a fulcrum. Since the cross section of the second brake shoe 7D is formed in a U-shape, as the second arm 7B swings in the direction of the arrow e, it moves from the outside of the wheel 6 to the inside. Once it bites. As a result, the wheels 6 are strongly braked.

Therefore, when a rotational force is applied to the wheel 6 in the counterclockwise direction in FIG. First, the hand truck can be stopped reliably.

Moreover, when the worker releases the brake handle 20 when lifting or lowering the cargo onto the loading platform 1, the spring force of the compression spring 11 is applied to the nut 16 → the connecting rod 10 → the third and fourth arms 8A, 8B → the connecting member. 13A,
13B→Transmitted to the first and second brake shoes 7C and 7D through the first and second arms 7A and 7B, so that the first and second brake shoes 7C and 7D apply braking to the wheels 6. Since it works, wheel 6
The brake can be automatically applied to the wheel 6, and when the brake is applied, either the first or second brake shoe 7C or 7D is activated depending on the direction of the rotational force acting on the wheel 6 as described above. Since the wheels always bite from the outside to the inside of the wheels 6 and apply strong braking, it is possible to safely carry out loading and unloading operations.

Next, when moving the hand truck, grip the brake handle 20 together with the hand truck handle 4, and move the rod 9 against the spring force of the compression spring 11 in the opposite direction of arrow a in FIG. raise it to

When the rod 9 is pulled in the opposite direction of the arrow a, the connecting rod 10 is pulled up, and accordingly, the third and fourth arms 8A, 8B and the connecting members 13A, 13B are pulled up.
through which the first and second arms 7A and 7B connect to pin 1.
2 as a fulcrum and rotate in directions that move away from each other.
As a result, the first and second brake shoes 7C, 7
D moves away from the wheel 6 and the brake is released. Therefore, since the wheels 6 can freely rotate, the hand truck can be freely moved to a desired location.

Furthermore, in this embodiment, the other ends of the first and second arms 7A and 7B supporting the first and second brake shoes 7C and 7D are connected by a common pin 12, and Connect one end of the third and fourth arms 8A and 8B to the connecting members 13A and 13B attached to the second arms 7A and 7B with pins 14A and 1.
4B, and the third and fourth arms 8A, 8
The other end of B is connected to one end of the connecting rod 10 by a common pin 15, and the first and second arms 7A, 7B and the third and fourth arms 8A, 8B are smoothly connected to each of the pins. It is connected in such a way that it is linked to the

Therefore, when the worker releases the brake handle 20 to apply brakes to the wheels 6, and when the worker releases the brakes by grasping the brake handle 20, the third and fourth arms 8A, 8B and first and second arms 7A,
7B can operate smoothly,
The first and second brake shoes 7C and 7D are connected to the wheels 6
It is possible to reliably operate the brake in the direction in which the brake is applied and in the direction in which the brake is released.

In addition, in this invention, instead of the compression spring 11, one having rubber elasticity may be used.

Furthermore, as shown in the drawings, the braking device is not limited to being disposed on the rear caster, but may be disposed on other casters.

Furthermore, the shape and mounting structure of the brake handle 20 and the operating rod are not limited to the embodiment shown in the drawings.
Any material may be used as long as it has the intended function.

According to this invention explained above, there are the following effects.

() When you release the brake handle, the operating rod is pushed by the action of the elastic body, and this operating rod pushes the third and fourth arms, which in turn push the first and second arms. is pushed in, and the first and second arms
Brake shoes are crimped to the front and rear of the wheels, and are configured to automatically apply braking to the wheels. Therefore, when lifting or lowering cargo, the worker simply releases the brake handle.
This has the effect of stopping the hand truck.

() The first and second arms are swingably connected to the caster bracket by pins, and the first and second brake shoes are connected to the front and rear of the wheels via the first and second arms. Moreover, the first and second brake shoes are formed into a U-shape in cross section. As a result, when the hand truck is stopped and a rotational force is applied to the wheel in the direction of moving it forward or backward, the first and second brake shoes are in close contact with the wheel, so that At this time, one of the first and second brake shoes is pulled in the direction of rotation of the wheel by frictional force, and at this time, the first and second arms swing toward the inside of the wheel. The first and second brake shoes bite into the wheel from the outside to the inside. Therefore, when a rotational force is applied to the wheels in the direction of moving them forward or backward, the wheels can be strongly braked by the first and second brake shoes in either case, and the hand truck can be stopped. This has the effect of being able to stop the vehicle reliably and safely.

() One ends of the first and second arms are integrally attached to the first and second brake shoes, and the other ends of the first and second arms are connected to the bracket of the caster using a common pin. , one ends of the third and fourth arms are connected to the first and second arms, and the other ends of the third and fourth arms are connected to the operating rod by a common pin. Therefore, by operating the brake handle and operating the operating rod in the direction of applying and releasing the brake on the wheels, the third and fourth arms,
Since the first and second arms are smoothly interlocked, the first and second brake shoes can be pressed against the wheel to apply braking, and the first and second brake shoes can be moved away from the wheel to release braking synchronously. , has the effect of ensuring reliable operation.

[Brief explanation of the drawing]

Fig. 1 is a side view of a hand truck to which the braking device of this invention is applied; Fig. 2 is a partially cutaway enlarged side view showing details of an embodiment of this invention disposed on the rear caster of the hand truck; The figure is the second
FIG. 4 is a perspective view showing the relationship between the wheel, the first and second brake shoes, and the members attached thereto. 1... Hand truck loading platform, 2... Same swivel caster, 3... Same rear caster, 4... Same handle, 5... Rear caster bracket, 6...
...the same wheels, 7A, 7B...the first and second arms constituting the braking device, 7C, 7D...the same first,
2nd brake shoe, 8A, 8B... 3rd brake shoe,
4th arm, 9... Rod constituting the operating rod, 10... Continuing rod, 11... Compression spring as an elastic body constituting the braking device, 12... First, second The pin connecting the arms of, 14A,
14B...pin connecting the third and fourth arms, 17...spring holder, 20...brake handle.

Claims (1)

[Claims for Utility Model Registration] (i) First and second brake shoes each having a U-shaped cross section are arranged in front and rear of a caster wheel rotatably supported by a bracket. , (ii) the first and second brake shoes are connected to the first and second brake shoes;
Attach one end of the second arm, and
The other end of the second arm is connected to the bracket by a common pin, and (iii) one end of the third and fourth arms are connected to the middle of the length of the first and second arms. and (iv) connecting the other ends of the third and fourth arms to the operating rod by a common pin; 1. An elastic body is provided that always pushes the second brake shoe in a direction that applies braking to the wheels, (v) the first and second brake shoes are attached to the operating rod against the elastic body, A braking device for a hand truck, characterized in that it is connected to a brake handle that is operated in a direction to release the brake.