JP3243730B2 - Casters with locking 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 with a lock mechanism capable of braking the rotation of a caster mounted on a bogie or the like.

[0002]

2. Description of the Related Art Conventionally, a caster with a lock mechanism provided with a brake operating lever has been known to brake the running of a caster mounted on a bogie or the like. Was attached to a swivel base unitary with the yoke supporting the wheels. Therefore, the braking operation lever turns together with the yoke type, and the position of the braking operation lever is not constant, which is very inconvenient in operation.

[0003]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and operates the brake operating lever so that the position of the brake operating lever is constant regardless of the direction of the wheel (yoke). It is an object of the present invention to provide a caster with a lock mechanism that can easily perform the above.

[0004]

In order to solve the above-mentioned problems, the present invention employs means for attaching a braking operation lever to a mounting board for fixing to a caster mounting object such as a truck. That is, according to the first aspect of the present invention, there is provided a caster in which a revolving base plate formed on an upper portion of a pair of support yokes that support wheels of the caster and a mounting base plate are thrust-beared by a pivot. An operating lever mounting bracket plate fixed to the mounting base plate so as to extend to the side of the board, an operating lever pivotally supported by the operating lever mounting bracket plate, and an integral with the operating lever A stopper member having a stopper surface for braking and a stopper surface for non-braking, an operating pin provided coaxially through the axis of the pivot shaft and movable upward and downward and urged upward, A plate-like rod body, a substantially middle part of which penetrates the side wall of the mounting base plate, is provided so as to be tiltable with the penetrating part as a fulcrum, and a base end of the stopper member for braking and a non-braking stopper In contact with the surface A portion is pivotally attached to a support yoke and a support yoke, which is locked to an upper end portion of the operation pin, and is displaced in conjunction with the elevation of the operation pin to separate from a braking position for pressing a brake shoe against a wheel peripheral surface. A technical means is provided in which the brake shoe is pressed to a brake release position.

According to the second aspect of the present invention, in addition to the above-mentioned structure, in addition to the above-mentioned structure, it is provided on an upper portion of the braking member and is locked by an annular lock receiving portion fixed to the swivel base when expanded, and when reduced. Technical measures are taken to include a locking portion that comes off and a brake shoe that is provided below the braking member and that is pressed against the peripheral surface of the wheel when expanding and separates when reducing. According to the third aspect of the present invention, the intermediate portion is rotatably supported by a support shaft provided between the pair of support yokes, and the bottom surface of the tip portion forms a brake shoe pressing surface. A brake shoe pressing member having a recess formed in the upper surface on the opposite side to be fitted with the lower end of the operating pin, and a plate-like spring material bent substantially in a V-shaped cross section, the base end of which is A braking member pivotally supported by a support shaft provided between a pair of support yokes, wherein the braking member is provided in the V-shaped space so as to interpose the brake shoe pressing member;
The V-shaped piece constituting the braking member comprises a wheel peripheral surface pressing portion formed on one of the pieces facing the peripheral surface of the wheel, and the operation bar is actuated by moving the operation lever up and down. A technical measure is taken in which the pin and the brake shoe pressing member are moved up and down to thereby brake or release the wheel. The rack is engraved along the lower peripheral surface of the support disk that supports the turntable, and the other end of the V-shaped piece of the braking member that faces the peripheral surface of the turntable. A locking projection protrudes from the rack, and the locking projection is engaged with the rack by the rotation of the brake shoe pressing member due to the downward movement of the operating pin, whereby the wheel is braked and the support yoke is rotated. The movement may be controlled.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the illustrated embodiments. Here, FIGS. 1 and 2 are side views showing a caster with a lock mechanism according to the present invention in a partial cross section,
FIG. 3 is a plan view of the caster with a lock mechanism shown in FIG. In the figure, reference numeral 11 denotes wheels of a caster, which is rotatably supported by a pair of support yokes 12. On the upper part of the support yoke 12, a turntable 13 is integrally formed.

[0007] The revolving base 13 is mounted on a mounting base 14 such as a trolley or the like and fixed to a mounting base 14.
A thrust bearing is rotatably provided via the first and second thrust bearings 5. That is, the swivel base 13 is supported by a pair of support discs 16 and 17 through balls 18a and 18b so as to be rotatably held in a thrust bearing. The support disk 1
A number of racks 16a are engraved on the lower peripheral surface of 6 along it.

As shown in FIG. 3 , an operation lever mounting bracket plate 19 is fixed to one side of the mounting base plate 14 via bolts 20. An operation lever 21 is rotatably supported at the distal end of the operation lever mounting bracket plate 19. The operation lever 21 is a pair of wall surfaces 22 that are opposed to and separated from each other.
a, 22b, each having two steps 23a on the upper surface,
23b, and these two steps 23a,
An OFF-step portion 24 and an ON-step portion 25 are provided horizontally so as to bridge over 23b, and the lower portions of the pair of wall surfaces 22a and 22b are pivotally connected to the distal end of the operation lever mounting bracket plate 19 via pins 26. Supported.

The pair of wall surfaces 2 of the operating lever 21
A stopper member 2 having a braking stopper surface 27a and a non-braking stopper surface 27b between lower portions 2a and 22b.
7 is formed integrally with the operation lever 21, and
6 is pivotably supported. The braking stopper surface 27a and the non-braking stopper surface 27b are connected to each other at an angle (for example, slightly larger than 90 degrees), and the braking stopper surface 27a is separated from the non-braking stopper surface 27b. It is formed at a position far from the pivot (pin 26).

Therefore, when the operation lever 21 is rotated clockwise by strongly stepping on the ON step portion 25 side,
The braking stopper surface 27a engages with an operation bar described later,
Press the OFF step part 24 side strongly and push the operation lever 2
By rotating the motor 1 in a counterclockwise direction, the non-braking stopper surface 27b is engaged with the operating bar. On the other hand,
An operating pin 28 is vertically movably provided so as to coaxially penetrate the hollow axis of the pipe-shaped pivot 15.

A collar 29 is provided near the upper end of the operating pin 28.
Is formed, and a coil spring 30 is wound between the flange portion 29 and the upper surface of the pivot shaft 15 to constantly urge the operating pin 28 in a direction to push it upward. An operation bar 31 formed of a plate-like rod having a U-shaped cross section is stretched between the upper end of the operation pin 28 and the stopper member 27. That is, a substantially intermediate portion of the operation bar 31 penetrates the side wall 14a of the mounting base plate 14, and is rotatable around the penetrating portion.
Braking surface 27a and non-braking stopper surface 2
7b as appropriate, and the leading end is locked to the upper end of the operating pin 28 via a hole formed in the leading end.

The lower end of the operating pin 28 has a hemispherical shape, and is engaged with a locking recess 33 formed in the upper surface of one end of the brake shoe pressing member 32. The brake shoe pressing member 32 has a triangular thick plate shape with a slightly flat cross section, and an intermediate portion thereof (slightly deviated in the direction of the thin portion) is provided between the upper portions of the pair of support yokes 12. The locking recess 33 is formed at a substantially central portion of a thick portion (a tip portion) and is rotatably supported by a support shaft (pin) 34.

The bottom surface of the tip of the brake shoe pressing member 32 forms a brake shoe pressing surface 32a. Further, the brake shoe pressing member 32 is provided so as to engage with a braking member 36 pivotally supported by a support shaft (pin) 35 provided between the upper portions of the pair of support yokes 12. That is, the braking member 36 is made of a plate-like spring material bent in a substantially V-shaped cross section, and its base end is pivotally supported via a support shaft (pin) 35.
The V-shape is urged in the closing direction, and a brake shoe pressing member 32 is provided in the V-shaped space so as to intervene.

Therefore, the braking member 36 performs the opening braking operation only when the brake shoe pressing member 32 rotates and forcibly widens the V-shaped space, but otherwise closes due to its elastic force. Has been energized. Of the V-shaped piece constituting the braking member 36, a wheel peripheral surface pressing portion 37 is provided at the tip end (a portion corresponding to the brake shoe pressing surface 32a) of one of the pieces 36a facing the peripheral surface of the wheel 11. 36a and are provided integrally.

That is, in the case of this embodiment, the extension of the distal end of the piece 36a is bent slightly downward substantially at a right angle, and the
Is formed in a U-shape on the front side thereof, and the cut piece is slightly bent downward to form a second brake shoe 40, which cooperates with the wheels. The wheel 11 can be pressed against the peripheral surface of the wheel 11 appropriately (when the brake shoe pressing member 32 rotates) to brake the rotation of the wheel 11.

Further, of the V-shaped pieces constituting the braking member 36, the other piece 3 facing the peripheral surface (lower surface) of the turntable 13.
The distal end of 6b is bifurcated and extends so as to avoid the operating pin 28, and a locking projection 38 is projected from each distal end. Each of the locking projections 38 is pushed upward by the rotation of the brake shoe pressing member 32,
It fits into one of a number of racks 16a on the lower peripheral surface of the support disk 16 so that the direction of the wheels 11 can be fixed. In addition, only one locking projection 38 may be used in some cases.

A description will be given of the braking operation of the caster with a lock mechanism having the above-described configuration. First, FIG. 1 shows a state before braking, so that the wheels 11 can travel in an arbitrary direction. In this state,
When braking the wheel 11, the operation step 21 is pushed down by strongly depressing the ON step portion 25 side (in the figure,
Rotate clockwise). As a result, the braking stopper surface 27a engages with the base end of the operation bar 31, rotates about the intermediate portion of the operation bar 31 (the side wall penetrating portion of the mounting base plate 14) as a fulcrum, and the distal end thereof moves downward. The operating pin 28 is pressed down against the elastic force of the coil spring 30.

As a result, the brake shoe pressing member 32 rotates about the support shaft (pin) 34, and its tip is pushed down to move the first brake shoe 39 and the second brake shoe 40 to the peripheral surface of the wheel 11. And the rotation of the wheels is stopped. At the same time, the other piece 3 is formed by the upper surface of the tip (thin portion) of the brake shoe pressing member 32.
The locking projection 38 at the tip of 6b fits into one of the many racks 16a on the lower peripheral surface of the support disk 16 to fix the direction of the wheel 11. Thereby, the wheel 11 rotates,
Since the orientation is fixed, a stable stop state is maintained.

In order to release the stopped state of the wheel 11, the operation lever 21 is pushed upward by strongly depressing the OFF step portion 24 (turned in the counterclockwise direction in the figure). Thereby, the non-braking stopper surface 27b
Engages with the base end of the operation bar 31, rotates about the intermediate portion of the operation bar 31, and pushes the tip thereof downward, whereby the operation pin 28 is raised by the elastic force of the coil spring 30. As a result, the brake shoe pressing member 3
2 rotates about the support shaft (pin) 34 by the elastic force of the braking member 36, and its tip is pushed up to press the first brake shoe 39 and the second brake shoe 40 against the peripheral surface of the wheel 11. Once unwound, the wheels are free to rotate back and can be moved in any direction.

In the above embodiment, the support disk 16
A number of racks 16a are provided on the lower peripheral surface of the brake member 36. On the other hand, an example is described in which a locking projection 38 is provided at the tip of the other piece 36b of the braking member 36, and these are fitted to each other.
In some cases, these may be omitted. In addition, the braking member has a structure in which both the locking portion for stopping rotation and the brake shoe for braking are provided, but a structure for performing only braking may be used. In this case, it is possible to adopt a configuration in which the brake shoe is directly pressed down without interposing the brake shoe pressing member. In addition, the present invention is not limited to the above-described embodiment, and it goes without saying that various other design changes can be made without departing from the scope of the present invention.

[0021]

As described above in detail, in the caster with a lock mechanism according to the present invention, the braking operation lever is mounted on the mounting base for fixing to the caster mounting object such as the bogie. Regardless of the direction of the (yoke), the position of the braking operation lever becomes constant, and the operation of the braking operation lever can be easily performed.

[Brief description of the drawings]

FIG. 1 is a side view of a caster with a lock mechanism according to an embodiment of the present invention, partially cut away.

FIG. 2 is a side view showing a caster with a lock mechanism according to an embodiment of the present invention, partially cut away.

FIG. 3 is a plan view of the caster with a lock mechanism shown in FIG. 1;

[Explanation of symbols]

11 ... wheels, 12 ... support yoke, 13 ... swivel base,
14: mounting base plate, 15: pivot, 16, 17: support disk, 18a, 18b: ball, 19: operating lever mounting bracket plate, 21: operating lever, 24: OF
F step part, 25 ... ON step part, 26 ... Pin,
27a: Stopper surface for braking, 27b: Stopper surface for non-braking, 28: Operation pin, 31: Operation bar,
32: brake shoe pressing member, 33: locking recess,
34, 35: Support shaft (pin), 36: Braking member, 37 ...
Wheel peripheral surface pressing portion, 39... First brake shoe, 40
... the second brake shoe.

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) B60B 33/00 B60B 33/00 501 B60B 33/00 502 B60B 33/02

Claims (4)

(57) [Claims] 1. A caster in which a revolving base plate formed on an upper portion of a pair of support yokes that support wheels of a caster and a mounting base plate are thrust-beared by a pivot, and are laterally mounted on the mounting base plate. An operating lever mounting bracket plate fixed to the mounting base plate so as to extend to the mounting base plate; an operating lever rotatably supported by the operating lever mounting bracket plate; and an operating lever integrally provided with the operating lever. A stopper member having a braking stopper surface and a non-braking stopper surface; an operating pin provided coaxially through the axis of the pivot shaft and movable upward and downward and urged upward; A substantially middle portion thereof penetrates the side wall of the mounting base plate, and is provided so as to be tiltable with the penetrating portion as a fulcrum, and a base end of the stopper member is provided with one of the braking stopper surface and the non-braking stopper surface. Contact and point An operating bar locked to the upper end of the operating pin; and a support yoke, which is pivotally attached to the support yoke, displaced in conjunction with the elevation of the operating pin, and moves away from a braking position for pressing the brake shoe against the peripheral surface of the wheel. A caster with a lock mechanism, comprising a brake shoe pressing member for displacing to a braking release position. 2. A caster in which a revolving base plate formed on a pair of support yokes that support wheels of casters and a mounting base plate are axially and axially thrust-beared, wherein the side surfaces of the mounting base plate are laterally mounted. An operating lever mounting bracket plate fixed to the mounting base plate so as to extend to the mounting base plate; an operating lever rotatably supported by the operating lever mounting bracket plate; and an operating lever integrally provided with the operating lever. A stopper member having a braking stopper surface and a non-braking stopper surface; an operating pin provided coaxially through the axis of the pivot shaft and movable upward and downward and urged upward; And a substantially middle portion thereof penetrates the side wall of the mounting base plate, and is provided so as to be tiltable with the penetrating portion as a fulcrum, and a base end of the stopper member is one of a braking stopper surface and a non-braking stopper surface . In contact with An operating bar having a portion locked to an upper end of the operating pin; a brake shoe pressing member pivotally attached to a support yoke and tilting in conjunction with the elevation of the operating pin; A braking member which is provided on an upper portion of the braking member, is locked by an annular locking receiving portion fixed to the swivel base when expanded, and comes off when reduced, and a lower portion of the braking member A caster provided with a lock mechanism, wherein the caster is provided with a brake shoe that is pressed against the peripheral surface of the wheel during expansion and separates when reduced. 3. An intermediate portion is rotatably supported by a support shaft provided between a pair of support yokes, and a bottom surface of a front end portion thereof forms a brake shoe pressing surface, and is opposite to the brake shoe pressing surface. A brake shoe pressing member having a recess formed in the upper surface of the operating pin to be fitted with the lower end of the operating pin; and a plate-like spring material having a substantially V-shaped cross section. A braking member pivotally supported by a support shaft provided between the yokes, the braking member being provided in the V-shaped space so as to interpose the brake shoe pressing member, and constitutes the braking member A wheel peripheral surface pressing portion formed on one of the V-shaped pieces opposing the peripheral surface of the wheel, and the operating bar, the operating pin and the brake shoe pressing member being moved up and down by the operating lever. Up and down, so that the wheels are not braked or Lockable caster according to claim 2, characterized in that to perform the dynamic release. 4. A rack is engraved along a lower peripheral surface of a support disk for supporting the turntable, and the other of the V-shaped pieces of the braking member facing the peripheral surface of the turntable. A locking projection protrudes from the end of the piece, and the locking projection is engaged with the rack by the rotation of the brake shoe pressing member due to the downward movement of the operating pin, whereby the wheel is braked and the support is performed. The caster with a lock mechanism according to claim 3, wherein rotation of the yoke is controlled.