JPH085842Y2 - Caster with brake device - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a caster with a brake device, and is particularly used as a caster for an industrial container box, medical diagnostic device, etc., and can reliably control not only stopping and running but also running restrictions. The present invention relates to casters with a brake device.

[0002]

2. Description of the Related Art Conventionally, casters have been used for grounding parts of heavy goods intended to be moved such as hand trucks used in factories, diagnostic equipment used in hospitals and public welfare facilities, beds, etc. , One person or a small number of people can move easily. Brake devices are generally attached to such casters.Recently, not only brakes that stop running, but also those that can stop the turning of the casters at the same time as running, and for more stable straight running In addition, there has been proposed a caster provided with a brake device capable of separately locking the rotation of the wheel and the turning of the caster. An example of such a conventional technique is Japanese Patent Publication No. 54-4140.

However, the conventional caster with a brake device capable of locking the wheel and the caster separately or simultaneously has a problem that the mechanism is complicated, the number of parts is large, and the assembling process is complicated. Also, due to the complicated mechanism, its function is delicate, and there is a problem that the braking of the wheels is released and the casters that have been locked turn due to slight vibration and shock. .

[0004]

SUMMARY OF THE INVENTION The object of the present invention is to solve the above-mentioned problems of the prior art, to reduce the number of parts and to rotate the wheels and the casters at the same time with a simple mechanism, or only to rotate the casters. (EN) A caster with a brake device that can be selectively and reliably locked.

[0005]

In order to achieve the above object, the present invention is directed to a support yoke having an inverted U-shaped cross section having a pedal frame at one end and a caster mounting hole at the other end, and below the support yoke. A wheel rotatably disposed between both sides extending through a support shaft via a support shaft, and a ball bearing and a swivel locking tray respectively disposed on the upper side and the lower side of the support yoke so as to sandwich the caster mounting hole. A caster mounting member that presses the swivel locking dish from below, and a bolt that rotatably fixes the mounting base to the support yoke through the ball bearing, the caster mounting hole, the swivel locking dish, and the caster mounting member. The nut, the stake pedal and the brake pedal pivotally mounted in the pedal frame of the support yoke through the pedal pin, and the cover on the rear surface of the stake pedal. One end extends to the turning lock operation piece for stopping the turning of the caster by fitting the projection at the other end to the turning locking notch of the caster mounting member by the turning of the stick pedal, and the back surface of the brake pedal. One end extends to the cam of, and is rotated by the brake pedal to be pressed by the lower wheel to stop the rotation of the wheel.
And a wheel lock plate for stopping the turning of the caster by fitting the projection at the other end into the turning locking groove of the turning locking dish.

[0006]

A brake pedal having a cam on its rear surface is pivotally mounted in the pedal frame at one end of the upper portion of the supporting yoke for supporting the wheel, one end of the brake pedal extends to the cam on the rear surface of the brake pedal, and the other end of the upper portion of the upper portion of the supporting yoke. A wheel lock plate that extends to the swivel locking tray of the caster arranged at the end is pivotally attached to a support yoke between the brake pedal and the caster, so that the front side (pilot side) of the brake pedal is depressed. The brake pedal is on the operator side (hereinafter referred to as the rear)
When it is rotated to, the cam on the back surface of the brake pedal presses one end of the wheel lock plate extending to the lower part against the wheel below it to lock the rotation of the wheel, and the protrusion at the other end turns The turning of the caster is locked by fitting into the turning locking groove of the locking tray.

In the same manner as the brake pedal in the pedal frame, a stake pedal having a cam on the back surface is pivotally attached via the same pedal pin, and one end extends below the stake pedal to the cam of the stake pedal, and the other end is aforesaid. By pivotally attaching the turning lock operating piece extending to the caster mounting member of the caster via the same axis as the wheel lock plate, when the steak pedal is stepped backward and rotated, the cam on the rear surface of the steak pedal is rotated. Pushes down one end of the swivel lock actuating piece downwardly, and with this rotation, the swivel locking projection at the other end fits into the swivel locking notch of the caster mounting member, and the caster swivels. Be stopped. In this case, only the turning of the casters is locked, and the wheels can rotate freely without any braking.

In the present invention, the support yoke has an inverted U-shaped cross section.
It is a member that forms the main appearance of the caster body having a character shape, and supports wheels between both sides of the caster body via a support shaft, and a pedal frame and caster mounting holes are provided on the upper portion thereof. The casters arranged in the caster mounting holes of the support yoke include, for example, ball bearings and a swing lock plate which are respectively arranged on the upper side and the lower side of the caster mount hole so as to sandwich the caster mount hole, and the swing lock plate is pressed from below. The caster mounting member and the fixing member that pivotally fixes the mounting base to the support yoke by integrally engaging them. Any known ball bearing may be used as long as it can rotatably engage the mounting base with the support yoke.

The mounting base is a member for mounting the caster with a brake device of the present invention to a grounding portion of a heavy object for moving, such as an industrial container box, and its shape is not particularly limited. However, it is preferably a track type. The swivel locking dish is a disk-shaped member that is a component of the caster, and a large number of swivel locking grooves are provided on the outer periphery of the lower side surface thereof.

The caster mounting member is a disk-shaped member, like the swivel locking tray, and has a lower surface with a circumferential portion,
A notch for turning locking that fits with a protrusion provided at one end of a turning lock actuating piece described later is provided. In the present invention, the brake pedal is an operation pedal arranged in the pedal frame of the support yoke, and a cam is provided on the back surface thereof, and the cam is a wheel lock plate which is always arranged below the cam. Is in contact with.

FIG. 6 is an explanatory view showing the positional relationship between the brake pedal and the wheel lock plate during braking and during non-braking according to the present invention. In the figure, when not braking, the brake pedal 1
The cam 13a on the back surface of the No. 3 is in contact with the upper side surface of the wheel lock plate 16 via a wide contact surface A. By making contact through such a wide contact surface, the brake pedal 1
The angle α between the upper wall surface of the wheel 3 and the wheel lock plate 16 is always kept constant as long as the brake pedal 13 is not operated, and does not change due to an external impact or the like. During braking, the end portion (fulcrum) C of the cam 13a of the brake pedal 13
Since the rotation axis D and the rotation axis D are deviated by the distance B, the brake pedal 13 at the time of braking has a direction a for releasing the braking.
Not only that, since the force that tries to rotate in the braking direction b acts, the lock will not be opened by vibration or impact unless this is intentionally released. Further, when rotating the cam and the wheel lock plate, the lever ratio is set as shown in FIG.
A moment ratio represented by × H / G = 1 / τ can be obtained, and a large braking force can be obtained with a small acting force.

In the present invention, the wheel lock plate is defined between the brake pedal and the caster so that one end of the wheel lock plate contacts the cam on the back surface of the brake pedal and the other end of the wheel lock plate extends to the pivot locking tray of the caster. An elastic body made of, for example, a steel plate pivotally attached to a support yoke via a lock pin,
When the brake pedal is operated, one end of the brake pedal is pressed against the wheel to lock its rotation, and the protrusion at the other end is fitted into the swivel locking groove of the swivel locking tray to lock the swivel of the caster. Is.

In the present invention, the stick pedal is a pedal which is arranged in the pedal frame of the support yoke together with the brake pedal and which is operated only when the turning of the caster is stopped. A cam is provided as well. This cam is constantly in contact with the swing lock actuating piece arranged below the cam, and its positional relationship is stable and does not change unless the steak pedal is operated.

The turning lock actuating piece is provided with the same lock pin as the wheel lock plate so that one end contacts the cam of the steak pedal and the other end extends to the caster mounting member of the caster. An elastic body made of, for example, a steel plate, which is pivotally attached to the support yoke, and when the steak pedal is operated, one end contacting the cam on the back surface of the elastic body is pressed and pivoted downward, and the projection at the other end is formed by the caster. The rotation of the caster is locked by fitting into the notch for rotation locking of the mounting member.

In the present invention, one end of the swing lock actuating piece that abuts the steak pedal has a recess provided in a cam portion of the steak pedal when the cast pedal is operated to lock the swing of the caster. It is preferable to provide a convex portion that fits in. As a result, the caster cannot be unlocked unless the steak pedal is intentionally operated to return it to its original position.

[0016]

EXAMPLES The present invention will now be described in more detail by way of examples. FIG. 1 is a plan view of a caster with a brake device according to an embodiment of the present invention. In the drawing, this caster with a brake device comprises a support yoke 1 having an inverted U-shaped cross section, a wheel 3 rotatably disposed between both sides of the support yoke 1 via a support shaft 2, and the support yoke 1. Is mainly composed of a caster portion provided at an upper end portion of the above, and a brake operation portion provided at the other upper end portion of the supporting yoke facing the caster portion. The caster portion is mounted in the caster mounting hole 4. Placed ball bearing 5, swivel locking tray 6 adjacent to said ball bearing 5 via said caster mounting hole 4, caster mounting member 7 pressing said swivel locking tray 6 from below, and penetrating these Then, it is composed of a bolt 9 and a nut 10 for rotatably fixing the track type mounting base 8 mounted on the ball bearing 5 to the support yoke 1. On the other hand, the brake operating portion includes a pedal frame 11 provided at the other end of the support yoke 1 and the pedal frame 11
A steak pedal 14 and a brake pedal 13, which are pivotally mounted in the inside through a pedal pin 12, and one end of which abuts on a cam 13a on the rear surface of the brake pedal 13 and the other end of which protrudes to the swivel locking tray 6 of the caster. One end is brought into contact with the wheel lock plate 16 pivotally mounted between both sides of the support yoke 1 via lock pins 17 so as to extend, and the cam 14a on the back surface of the stake pedal 14 is brought into contact with the other end, and the caster mounting member is provided at the other end. The wheel lock plate 16 is pivotally mounted between both sides of the support yoke 1 so as to extend up to 7 through the same lock pin 17 as the wheel lock plate 16, and is mainly constituted by a turning lock operating piece 15. Reference numeral 19 is a spring that returns the swing lock actuating piece to its original position.

FIGS. 4 and 5 are a plan view and a rear view of the caster with a brake device shown in FIG. 1, respectively. In FIG. 4, a brake pedal 13 and a steak pedal 14 are arranged side by side in the pedal frame 11 of the support yoke 1. In addition, in FIG.
One end of the swivel lock actuating piece 15 extends so as to come into contact with the cam 14a, and a projection 15a fitted to the swivel locking notch 7a of the caster mounting member 7 is provided at the other end. Further, the cam portion 1 of the brake pedal 13
One end of the wheel lock plate 16 extends so as to come into contact with the wheel lock plate 3a, and the other end extends to a swing lock groove of a swing lock tray 6 of a caster (not shown). In such a structure, the caster with a brake device of the present embodiment is used, for example, by mounting it on a box container. When it is desired to stop the traveling of the box container, by depressing the brake pedal 13 rearward, the rotation of the wheels and the turning of the casters can be stopped at the same time, and can be stopped instantaneously.

FIG. 2 is an explanatory view when the brake pedal 13 is stepped backward to simultaneously lock the rotation of the wheels 3 and the turning of the casters. In the figure, the brake pedal 1
3 is pivoted to the operator side, that is, to the left in the figure with the pedal pin 12 as an axis, and is provided at one end of a wheel lock plate 16 that extends downward due to the rotation of the cam 13a on the back surface associated with this pivoting. The rubber elastic body 18 is pressed against the wheel 3 to lock the rotation of the wheel 3. At this time, the turning lock protrusion 16a at the other end of the wheel lock plate 16 is fitted into the turning lock groove formed in the turning lock tray 6 of the caster, and the turning of the caster is locked at the same time.

To unlock the rotation of the wheels and the turning of the casters to run the container box, depress the upper part of the brake pedal 13 and return it so that its pedal surface is parallel to the floor surface. Since the cam 13a on the back side also rotates in the direction opposite to that when the wheels and casters are locked, the force that pushes one end of the wheel lock plate 16 extending below the cam 13a downwards disappears, and the wheel lock plate 16 is removed. The lock pin 17 is rotated about its axis, and the elastic body 18 provided at one end of the lock pin 17 is separated from the wheel 3 to unlock the wheel. At the same time, the wheel lock plate 16
The rotation of the caster unlocks the swivel lock projection 16a at the other end from the swivel lock groove of the swivel lock tray 6 to unlock the caster from swing.

On the other hand, when the box container is desired to be stably linearly traveled, by depressing the steak pedal 14, it is possible to lock only the turning of the caster without locking the rotation of the wheels 3. FIG. 3 is an explanatory diagram of a case in which the caster 14 is depressed to lock only the turning of the casters. In the drawing, when a steak pedal 14 arranged in parallel with the brake pedal 13 is stepped on the rear side and rotated in the right direction in the figure, the cam 14a on the back surface of the steak pedal 14 also rotates rearward, and the cam 14a
One end of the swing lock operating piece 15 extending to the lower side of a is pushed down, the swing lock operating piece 15 is rotated about the lock pin 17, and the swing lock projection 15a provided on the other end is attached to the caster. Since the notch 7a for turning locking of the member 7 is fitted, turning of the caster is locked. At this time, the cam 14 on the back of the steak pedal 14
The concave portion 20a and the convex portion 21 of the swing lock actuating piece 15 are fitted to each other so that the lock is not easily released due to vibration or impact. In order to unlock the turning of the casters, when the front of the steak pedal 14 is depressed and turned forward (to the left in the figure), the turning lock actuating piece 15 also moves forward with the lock pin 17 as the axis. When the caster mounting member 7 is rotated, the turning lock projection 15a is released from the turning locking notch 7a of the caster mounting member 7, so that the turning lock of the caster is released.

According to this embodiment, the turning of the casters and the rotation of the wheels can be locked simultaneously by only operating the brake pedal 13, so that, for example, the box container equipped with this embodiment can be stopped instantaneously. it can. Further, even when the vehicle is stopped on the inclined surface, the stop position does not shift. According to the present embodiment, since the mounting base 8 is of a truck type, it can be used not only for a mobile bed for medical use but also for a heavy load, for example, an industrial box container.

Further, according to this embodiment, the brake pedal system for simultaneously stopping the rotation of the wheels and the turning of the casters and the stick pedal system for locking the turning of the casters are completely independent. Each can be used alone if necessary. For example, a caster with a brake device equipped only with a brake pedal system can be used to lock the turn of the caster and allow the box container to travel straight forward stably, and when the function of locking only the turn of the caster is not required. Can also be

Further, according to the present embodiment, the wheel lock plate 1
Since the rubber elastic body 18 is arranged in the portion of the wheel 6 which is pressed by the wheel, the friction coefficient at the time of braking is high, the wheel can be locked completely, and the braking force is maintained even when the tire portion of the wheel is worn to some extent. It never decreases. According to the present embodiment, the corners of the end portion of the bedal frame 11 portion of the support yoke 1 are chamfered so that the depression surfaces of the brake pedal 13 and the steak pedal 14 protrude from the pedal frame 11, so that the rear or Since the end of the pedal frame 11 comes into contact with the back side of the stepping surface of the brake pedal 13 or the steak pedal 14 that has been stepped forward, and serves as a stopper, excessive stepping is eliminated.

The caster with a brake device according to the present embodiment can be directly mounted on the leg portion of, for example, a movable bed by using a bolt and nut without using the mounting base 8. In the present embodiment, the wheel lock plate 16 has one end in contact with the cam 13a of the brake pedal 13 and a part of the other end in contact with the inside of the upper wall surface of the support yoke 1 with the lock pin 17 as the rotation axis. Since a spring effect due to the elasticity of 16 itself occurs, a return spring is not required.

[0025]

According to the present invention, the rotation of the wheels and the turning of the casters can be locked at the same time only by operating the brake pedal. Therefore, for example, a container box equipped with the present invention can be instantaneously and stably stopped. Can be made.
Also, the caster with a brake device of the present invention has a relatively simple structure with a small number of parts, so once applied, the brake will not come off due to external shock or vibration unless the brake is intentionally released. Easy maintenance and inspection.

[Brief description of drawings]

FIG. 1 is a front view of a caster with a braking device according to the present invention.

FIG. 2 and

2 and 3 are explanatory views for explaining the function of the brake device of FIG. 1, respectively.

FIG. 4 is a plan view of FIG.

5 is a rear view of FIG. 1. FIG.

FIG. 6 is a partially enlarged view for explaining the function of the present invention.

[Explanation of symbols]

1 ... Support yoke, 2 ... Support shaft, 3 ... Wheel, 4 ... Caster mounting hole, 5 ... Ball bearing, 6 ... Swivel locking plate, 7
... Caster mounting member, 7a ... Notch for turning locking, 8 ...
Mounting base, 9 ... Bolt, 10 ... Nut, 11 ... Pedal frame, 12 ... Pedal pin, 13 ... Brake pedal, 13
a ... cam, 14 ... steak pedal, 14a ... cam, 1
5 ... Operation piece for turning lock, 16 ... Wheel lock plate, 15a
16a ... Protrusion for turning lock, 17 ... Lock pin, 18
... rubber elastic body, 19 ... spring, 20 ... recessed portion of cam of steak pedal, 21 ... convex portion of swing lock actuating piece.

Claims (1)

[Scope of utility model registration request] 1. A support frame having an inverted U-shaped cross section having a pedal frame at one end of the upper part and a caster mounting hole at the other end, and rotatably supported by a support shaft between both sides extending downward of the support yoke. Wheels arranged, ball bearings and a swivel locking plate respectively arranged on the upper side and the lower side so as to sandwich the caster mounting hole of the support yoke, and a caster mounting member for pressing the swivel locking plate from below. A bolt nut that rotatably fixes the mounting base to the support yoke by penetrating the ball bearing, the caster mounting hole, the swivel locking tray, and the caster mounting member; and a pedal pin in the pedal frame of the support yoke. Of the steak pedal and brake pedal that are pivotally attached to the cam, and one end that extends to the cam on the back surface of the steak pedal. A swivel lock actuating piece for stopping the swivel of the caster by fitting the protrusion at the other end into the swivel locking notch of the caster mounting member, and one end extending to the cam on the back surface of the brake pedal, A wheel lock plate that is pressed by the lower wheel by rotation to stop the rotation of the wheel and causes the protrusion at the other end to be fitted in the turning locking groove of the turning locking tray to stop the turning of the caster. Casters with a brake device characterized by.