JP2831284B2 - Caster braking mechanism - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a caster in which a braking force can be adjusted so that a caster can be brought into a half-brake state, a complete brake state, or a free state.
The present invention relates to a caster braking mechanism that can be switched.

[0002]

2. Description of the Related Art A caster braking mechanism in which a caster can be appropriately switched to a braked state or a free state is conventionally known.
It simply switches between the two states of the brake state and the free state. Since the braking force is constant,
There is a drawback that it is not possible to apply a half brake or to perform a complete braking depending on the use situation.

[0003]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and its main object is to brake or release the brake in a half-brake state, a complete brake state, and a free state. It is an object of the present invention to provide a caster braking mechanism capable of performing the following.

[0004]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention comprises a substantially plate-like body, a base end of which is rotatably supported near the periphery of a wheel, and a brake shoe provided near the base end. A brake drive pedal provided on the back surface facing the periphery of the wheel and having a recess in a part of the upper surface, and a peripheral portion of the brake drive pedal substantially perpendicular to a surface near the brake shoe mounting position of the brake drive pedal. A brake release pedal having a cam plate which is in contact with and is rotatably provided; one end of which is locked to a portion of the brake driving pedal which is closer to the tip end than the brake shoe mounting position, and the other end of which is further away therefrom; A spring body which is locked via one edge of the cam plate and is always urged between them, and urged in a direction to raise the tip end of the brake driving pedal. Is A projection that can be concavely and convexly engaged with a depression of the brake driving pedal with which the cam plate abuts, a first contour portion that keeps the brake driving pedal from pressing against the wheel side, A second contour section that keeps the brake drive pedal pressed against the wheels to the extent that it rotates, and a third contour section that keeps the brake drive pedal pressed against the wheels so that the wheels do not rotate. Are formed sequentially, and technical measures are taken. According to the second aspect of the present invention, a projection is provided instead of the depression of the brake driving pedal, and a depression that can be engaged with the projection is provided on a contact surface of the cam plate with the brake driving pedal plate. , Taking the technical measures of.

[0005]

When the brake release pedal is depressed, the cam plate simultaneously rotates in one direction, and as a result, the brake drive pedal rotates upward in the opposite direction due to the force of the spring body, and the cam plate protrudes. The portion (or depression) fits into the depression or projection of the brake driving pedal. At the same time, the surface of the first contour portion of the cam plate comes into contact with the surface of the brake driving pedal, and as a result, the brake shoe separates from the wheel and the wheel is kept free. Next, when the brake is applied to the wheel, when the brake drive pedal is depressed, the projection or depression of the cam plate is disengaged from the engagement with the depression or projection of the brake drive pedal, and as a result, the force of the spring body is reduced. Works to rotate the brake release pedal in the opposite direction together with the cam plate, so that the upper surface of the brake drive pedal contacts the second contour of the cam plate and the half brake is maintained. Further, by pushing up the brake release pedal, it comes into contact with the third contour portion of the cam plate, thereby maintaining the braking force of the brake completely applied.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of a caster braking mechanism according to the present invention will be described below with reference to the drawings. FIG. 1 is a partially cutaway side view for explaining a braking mechanism of a caster according to the present invention, showing a state in which a half brake is applied, FIG. 2 is a side view of a main part showing a state in which a brake is released, 3 is a side view of a main part showing a state in which the brake is completely applied, FIG. 4 is a partial cross-sectional view of FIG. 1 viewed from the right side of the figure, and FIG. 5 is a view of FIG. 1 viewed from above. It is a top view.

As shown, the entire caster braking mechanism is fixed so as to be substantially covered by a holder 2 having a base fixed to a yoke 1. The caster braking mechanism mainly includes a brake driving pedal 11,
A brake release pedal 21 and a spring body 31 are provided, and the brake pedal portion is provided so as to protrude outward.

The brake driving pedal 11 has a substantially plate-like shape with its distal end constituting an operating portion 12, and has support plates 13 erected on both left and right sides of its base end, on which both ends of a brake shoe shaft 14 are provided. It has been penetrated. Therefore, the brake driving pedal 11 is rotatable via the brake shoe shaft 12. The brake shoe shaft 14
Is fixed inside the holder 2. A brake shoe 15 is provided on the rear surface near the base end of the brake driving pedal 11 so as to face the peripheral surface of the wheel 3. Further, a recess (a cut-out portion in the illustrated example) 16 is provided on one surface of the brake driving pedal 11 (the side in contact with a cam plate to be described later) at a position close to a portion where the brake shoe 15 is provided.

The brake release pedal 21 generally includes a cam plate 22 and an operation arm 23 connected to the cam plate 22 so as to extend outward. The cam plate 22 is rotatably provided via a cam pedal shaft 24 having both ends fixed to the holder 2, and its peripheral edge is substantially perpendicular to the surface of the brake driving pedal 11 near the mounting position of the brake shoe 15. They are provided so as to be in contact with each other. Further, a contact portion of the cam plate 22 with the brake driving pedal 11 is formed as follows.

That is, the cam plate 22 has, at its base, a projection 25 which fits into the depression 16 of the brake driving pedal 11 as appropriate, and connects the projection 25 to the brake driving pedal 11 to release the brake. A substantially straight first contour portion 26 to be kept and a second contour portion 27 formed in a curved shape to keep the brake slightly applied (half brake state)
And a substantially linearly formed third contour portion 28 that keeps the brake fully applied.

The spring body 31 is made of, for example, a coil spring. One end of the spring body 31 is provided on a portion of the brake driving pedal 11 closer to the distal end than the mounting position of the brake shoe 15.
And the other end is fixed to one edge of the cam plate 22 distant therefrom (that is, a portion substantially opposite to the direction in which the operation arm 23 extends with the cam pedal shaft 24 as a center). It is locked by the member 29 so that it can always be approached, that is, the tip portion of the brake driving pedal 11,
That is, it is urged to raise the operation arm 23.

Next, the operation of the caster braking mechanism having such a configuration will be described. First, when the operation arm 23 of the brake release pedal 21 is depressed in a state where the brake shown in FIG. 1 is applied, the cam plate 22 simultaneously rotates in one direction (clockwise in the figure),
As a result, the brake driving pedal 11 rotates upward in the opposite direction (counterclockwise in the drawing) by the force of the spring body 31, and the protrusion 25 of the cam plate 22 causes the depression or depression of the brake driving pedal 11. The notch 16 is fitted. At the same time, the surface of the first contour portion 26 of the cam plate 22 and the surface of the brake driving pedal 11 come into contact with each other. As a result, as shown in FIG. Will be kept in a state.

Next, when the brake shoe 15 in FIG. 2 is released from the wheel 3 to apply a brake to the wheel 3 when the brake drive pedal 11 is depressed, the projection 25 of the cam plate 22 is thereby braked. The drive pedal 11 is disengaged from the recess or the notch 6, and as a result, the force of the spring body acts to move the brake release pedal 21 together with the cam plate 22 in the opposite direction (counterclockwise in the figure).
, And the upper surface of the brake driving pedal 11 is displaced to a position where it comes into contact with the second contour portion 27 of the cam plate 22.
In this position, when a strong force is applied, the brake driving pedal 11 can be maintained in a half-brake state in which the brake driving pedal 11 is pressed toward the wheel to such an extent that the wheel rotates.

Further, when the brake drive pedal 11 is depressed, the brake release pedal 23 is pushed up and comes into contact with the third contour portion 28 of the cam plate 22, whereby the braking force of the brake is maximized (see FIG. 3). In this case, the present invention is not limited to the above embodiment. When the brake drive pedal 11 is depressed, the upper surface of the brake drive pedal 11 can be kept in contact with the second contour portion 27 of the cam plate. May be displaced by directly pushing up the brake release pedal 23 until the brake release pedal 23 comes into contact with the third contour portion 28, or the brake drive pedal 11 is sufficiently depressed to come into contact with the third contour portion 28. By slightly depressing the brake release pedal 21 from the state where the brake is fully applied, the upper surface of the brake drive pedal is brought into contact with the second contour portion 27 of the cam plate, and the braking force of the brake is changed to the half brake state. You may keep it.

In the above embodiment, the brake drive pedal 11 is provided with a depression or notch 16 and the cam plate 22 is provided with a projection 25.
This may be reversed. That is, a projection may be provided on the brake driving pedal 11, and a depression or notch may be provided on the cam plate 22.

[0016]

As described above, according to the caster braking mechanism of the present invention, the half brake state, the complete brake state, and the brake release state can be achieved only by depressing the brake drive pedal or the brake release pedal. You can change it, you can get the optimal braking force according to the usage situation, it will be extremely convenient for practical use,
It has a remarkable effect.

[Brief description of the drawings]

FIG. 1 is a partially cutaway side view for explaining the operation of a caster braking mechanism according to the present invention.

FIG. 2 is a partially cutaway side view for explaining the operation of the caster braking mechanism according to the present invention.

FIG. 3 is a partially cutaway side view for explaining the operation of the caster braking mechanism according to the present invention.

FIG. 4 is a partial cross-sectional view of FIG. 1 viewed from the right side of the figure.

FIG. 5 is a plan view of FIG. 1 as viewed from above.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Yoke 2 ... Holder 3 ... Wheel 11 ... Brake drive pedal 12 ... Operating part 13 ... Support plate 14 ... Brake shoe shaft 15 ... Brake shoe 16 ... Notch 21 ... Brake release pedal 22 ... Cam plate 23 ... Operation Arm part 24 ... Cam pedal shaft 25 ... Protrusion part 26 ... First contour part 27 ... Second contour part 28 ... Third contour part 29 ... Fixing member 31 ... Spring body

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁶ , DB name) B60B 33/00 B60B 33/00 501

Claims (2)

(57) [Claims] A base end is rotatably supported near the periphery of the wheel, and a brake shoe is provided on a back surface near the base end so as to face the periphery of the wheel. A brake driving pedal having a recess in a part thereof, and a cam plate having a peripheral portion abutting substantially perpendicularly to a surface of the brake driving pedal near a brake shoe mounting position and being rotatably provided. A brake release pedal, one end of which is locked to a portion of the brake driving pedal that is closer to the tip than the brake shoe mounting position, and the other end of which is locked via one edge of the cam plate that is further away therefrom. A spring body urged in a direction to always approach the space between them and to raise the tip portion of the brake drive pedal, wherein the cam plate is a brake drive pedal which a cam plate contacts. A projection that can be engaged with the depression of the brake pedal, a first contour that keeps the brake driving pedal from pressing against the wheel, and a brake driving pedal that rotates the wheel when a strong force is applied. And a third contour portion for keeping the brake drive pedal pressed against the wheel so that the wheel does not rotate. Caster braking mechanism. 2. A substantially plate-like body having a base end rotatably supported near a periphery of a wheel, a brake shoe provided on a back surface near the base end so as to face the periphery of the wheel, and A brake driving pedal provided with a projection on a part thereof; and a cam plate having a peripheral portion abutting substantially perpendicularly to a surface of the brake driving pedal near a brake shoe mounting position and rotatably provided. A brake release pedal, one end of which is locked to a portion of the brake driving pedal that is closer to the tip than the brake shoe mounting position, and the other end of which is locked via one edge of the cam plate that is further away therefrom. A spring body urged in a direction to always approach the space between them and to raise the tip portion of the brake drive pedal, wherein the cam plate is a brake drive pedal which a cam plate contacts. A concave portion capable of engaging with the projection of the brake, a first contour portion for keeping the brake driving pedal from pressing against the wheel side, and the brake driving pedal to such an extent that the wheel rotates when a strong force is applied. And a third contour portion for keeping the brake drive pedal pressed against the wheel so that the wheel does not rotate. Caster braking mechanism.