JPH0976704A - Casters with locking mechanism - Google Patents

Abstract

(57) [Summary] (Correction) [PROBLEMS] To provide a caster with a lock mechanism capable of braking the rotation of a caster attached to a dolly or the like. SOLUTION: The caster is a caster formed by thrust bearing a swivel base 13 and a mounting base 14 formed on an upper part of a support yoke 12, and an operating lever mounting bracket plate 19 extending laterally of the mounting base. And an operation lever 21 pivotally supported on the operation lever 21 and a stopper member integrally provided with the operation lever and having a braking stopper surface 27a and a non-braking stopper surface 27b and an axis of the pivot shaft up and down. An operation pin 28 movably provided, a spring body for urging the operation pin upward, an operation bar 31 rotatably provided about this as a fulcrum, a brake shoe pressing member 32, and a V-shaped fold. It is composed of a bent plate-shaped spring material, a brake shoe pressing member is interposed in the V-shaped space, and the wheel peripheral surface pressing portion is provided on one piece facing the peripheral surface of the wheel. .

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 attached to a truck or the like.

[0002]

2. Description of the Related Art Conventionally, there is known a caster with a lock mechanism provided with a braking operation lever in order to perform braking operation of a caster attached to a dolly or the like, but a conventional structure has a braking operation lever. Was attached to a swivel base that is integral with the yoke that supports 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 braking operation lever such that the position of the braking operation 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 be easily operated.

[0004]

In order to solve the above problems, the present invention employs means for attaching a braking operation lever to a mounting base for fixing to a caster mounting object such as a carriage. That is, according to the first aspect of the present invention, there is provided a caster in which a swivel base formed on an upper portion of a pair of support yokes that support the wheels of the caster and a mounting base are thrust bearings about a pivot shaft. An operating lever mounting bracket plate fixed to the mounting base so as to extend to the side of the panel, an operating lever pivotally supported by the operating lever mounting bracket plate, and an integral body with the operating lever. And a stopper member having a braking stopper surface and a non-braking stopper surface, and an operating pin that is vertically movably provided while coaxially penetrating the axis of the pivot shaft and is biased upward. It is composed of a plate-like rod body, an approximately middle portion of which penetrates the side wall of the mounting base, and is tiltably provided with this penetrating portion as a fulcrum. The base end of the stopper member is a braking stopper surface and a non-braking stopper. Touch the face, A part is pivotally attached to an operating bar, which is locked to the upper end of the operating pin, and a support yoke, and is displaced in conjunction with the up and down movement of the operating pin to separate it from a braking position where the brake shoe is pressed against the peripheral surface of the wheel. The technical measure is that it is composed of a brake pressing member that is displaced to the braking release position.

According to the invention of claim 2, in addition to the above structure, the braking member is provided at an upper portion of the braking member and is engaged with an annular engagement receiving portion fixed to the swivel base during expansion, and is reduced during contraction. The technical means is provided that includes an engaging portion that is disengaged and a brake shoe that is provided below the braking member and that is pressed against the peripheral surface of the wheel during expansion and separates when the vehicle contracts. Further, in the invention of claim 3, an intermediate portion is rotatably supported by a support shaft provided between a pair of support yokes, and a bottom surface of a tip portion thereof forms a brake shoe pressing surface. A brake shoe pressing member having a recess formed on the upper surface opposite to the above, which fits into the lower end of the operating pin, and a plate-shaped spring member bent in a substantially V-shaped cross section, the base end of which is A braking member pivotally supported by a support shaft erected between a pair of support yokes, the braking shoe pressing member being provided in a V-shaped space of the braking member;
Among the V-shaped pieces constituting the braking member, a wheel peripheral surface pressing portion formed on one of the V-shaped pieces facing the peripheral surface of the wheel is provided, and the operation bar and the operation are activated by the vertical movement of the operation lever. A technical measure is taken such that the pin and the brake shoe pressing member are moved up and down to brake or release the wheel. A rack is engraved along the lower peripheral surface of the supporting disk that supports the swivel base, and the other end of the V-shaped piece of the braking member that opposes the peripheral surface of the swivel base. A locking projection is provided on the shaft, and the brake shoe pressing member is rotated by the downward movement of the actuating pin to engage the locking projection with the rack, thereby braking the wheel and rotating the support yoke. The movement may be controlled.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION 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, 11 is a wheel of a caster, which is rotatably supported by a pair of support yokes 12. A swivel base 13 is integrally formed on the upper portion of the support yoke 12.

The turning base 13 is a pipe-shaped pivot shaft 1 with respect to a mounting base 14 which is attached and fixed to a mounting object such as a carriage.
Thrust bearings are rotatably provided via 5. That is, the swivel base 13 is thrust-bearing while being rotatably sandwiched between the pair of support disks 16 and 17 via the balls 18a and 18b. The support disk 1
A large number of racks 16a are engraved along the lower peripheral surface of the rack 6.

As shown in FIG. 5, an operating lever mounting bracket plate 19 is fixed to one side of the mounting base 14 via bolts 20. An operation lever 21 is rotatably supported at the tip of the operation lever mounting bracket plate 19. The operation lever 21 includes a pair of wall surfaces 22 facing each other and separated from each other.
a and 22b, and two step portions 23a on the upper surface,
23b is formed, and these two step portions 23a,
23b, an OFF step portion 24 and an ON step portion 25 are provided horizontally so as to be hung over 23b. The lower portions of the pair of wall surfaces 22a and 22b are pivoted to the tip portion of the operation lever mounting bracket plate 19 via a pin 26. It is 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 operating lever 21, and the pin 2 is also formed.
It is rotatably supported by 6 at its center. The braking stopper surface 27a and the non-braking stopper surface 27b are connected to each other at an angle (for example, an angle slightly larger than 90 degrees), and the braking stopper surface 27a is more than the non-braking stopper surface 27b. It is formed at a position far from the pivot (pin 26).

Therefore, when the ON step portion 25 side is strongly depressed and the operation lever 21 is rotated clockwise,
The braking stopper surface 27a engages with an operation bar described later,
OFF step part 24 side is strongly stepped on to operate lever 2
When 1 is rotated counterclockwise, the non-braking stopper surface 27b engages with the operating bar. On the other hand,
An operation pin 28 is provided so as to be vertically movable so as to coaxially pass through the hollow shaft center of the pipe-shaped pivot shaft 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 collar portion 29 and the upper surface of the pivot 15 to constantly urge the operating pin 28 in a direction to push it upward. Further, between the upper end of the operating pin 28 and the stopper member 27, an operating bar 31 formed of a plate-shaped rod body having a U-shaped cross section is bridged. That is, a substantially middle portion of the operating bar 31 penetrates the side wall 14a of the mounting base 14 and is rotatable about the penetrating portion as a fulcrum, and the base end thereof is the stopper member 27.
Braking surface 27a and non-braking stopper surface 2 of
7b is appropriately pressure-contacted, and the tip portion is engaged with the upper end portion of the operating pin 28 through the hole formed therein.

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 is a triangular thick plate having a slightly flat cross section, and an intermediate portion (slightly offset in the thin portion direction) of the brake shoe pressing member 32 is erected between the upper portions of the pair of support yokes 12. It is rotatably pivotally supported by a shaft (pin) 34, and the locking recess 33 is formed substantially in the center of the thick portion (tip portion).

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 that is also provided between the upper portions of the pair of support yokes 12. That is, the braking member 36 is composed of a plate-shaped spring material bent into a substantially V-shaped cross section, and its base end is pivotally supported via a support shaft (pin) 35, and is always
The V-shape is biased in the closing direction, and the brake shoe pressing member 32 is provided so as to intervene in the V-shaped space.

Therefore, the braking member 36 performs the opening braking operation only when the brake shoe pressing member 32 is rotated to forcibly expand the V-shaped space portion, but otherwise, the elastic force of the braking member 36 causes the braking member 36 to close. Is urged by. Among the V-shaped pieces constituting the braking member 36, the wheel peripheral surface pressing portion 37 is provided at the tip end portion (the portion matching the brake shoe pressing surface 32a) of one piece 36a facing the peripheral surface of the wheel 11. It is provided integrally with 36a.

That is, in the case of this embodiment, the tip extension portion of the piece 36a is bent downward substantially at a substantially right angle to form a first portion.
Of the brake shoe 39, the front side of which is cut in a U-shape, and the cut piece is bent slightly downward to form a second brake shoe 40, which cooperate to form a wheel. The rotation of the wheel 11 can be braked by appropriately contacting the circumferential surface of the wheel 11 (when the brake shoe pressing member 32 rotates).

Further, of the V-shaped pieces constituting the braking member 36, the other piece 3 which faces the peripheral surface (lower surface) of the swivel base 13 is formed.
The tip portion of 6b extends in a forked manner so as to avoid the actuating pin 28, and a locking projection 38 is provided at the tip of each portion. The locking projections 38 are pushed upward by the rotation of the brake shoe pressing member 32,
The support disk 16 is fitted with one of the many racks 16a on the lower peripheral surface thereof so that the direction of the wheel 11 can be fixed. In addition, depending on the case, the number of the locking projections 38 may be only one.

The braking operation of the caster with the lock mechanism constructed as described above will be described. First, FIG. 1 shows a state before braking, so that the wheels 11 can travel in any direction. In this state,
When braking the wheel 11, the ON step portion 25 side is strongly depressed to push down the operation lever 21 (in the figure,
Rotate clockwise). As a result, the braking stopper surface 27a engages with the base end portion of the actuation bar 31, rotates about the intermediate portion of the actuation bar 31 (side wall penetrating portion of the mounting base 14) as a fulcrum, and the tip end portion thereof moves downward. It is pushed down, whereby the actuating pin 28 is pushed 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 the tip end thereof is pushed down, so that the first brake shoe 39 and the second brake shoe 40 are attached to the peripheral surface of the wheel 11. The wheel is stopped from rotating. At the same time, the upper surface of the tip end (thin portion) of the brake shoe pressing member 32 causes the other piece 3 to move.
The locking projection 38 at the tip of 6b engages with one of the racks 16a on the lower peripheral surface of the support disk 16 to fix the orientation of the wheel 11. As a result, the wheel 11 rotates,
Since the orientation is fixed, it will be kept in a stable stopped state.

To release the stopped state of the wheel 11, the OFF step portion 24 is strongly depressed to push the operation lever 21 upward (rotate counterclockwise in the figure). As a result, the non-braking stopper surface 27b
Engages with the base end of the actuating bar 31 and rotates about the intermediate part of the actuating bar 31 as a fulcrum, and the tip end thereof is pushed up, whereby the actuating pin 28 is raised by the elastic force of the coil spring 30. As a result, the brake shoe pressing member 32 is rotated about the support shaft (pin) 34 by the elastic force of the braking member 36, and the tip portion thereof is pushed up, and the wheels of the first brake shoe 39 and the second brake shoe 40 are rotated. 11
The pressure contact with the peripheral surface of the wheel is released, and the wheel can freely rotate back to its original position and move in any direction.

In the above embodiment, the support disk 16 is used.
An example has been described in which a large number of racks 16a on the lower peripheral surface are provided, on the other hand, a locking projection 38 is provided at the tip of the other piece 36b of the braking member 36, and these are fitted together.
Depending on the case, these may be omitted. Further, although the braking member has a structure in which both the locking portion for stopping rotation and the brake shoe for braking are provided, the structure may be such that only braking is performed. In this case, it is possible to directly push down the brake shoe without providing a brake shoe pressing member. In addition, the present invention is not limited to the above-described embodiments, and needless to say, various design changes can be made without departing from the scope of the present invention.

[0021]

As described above in detail, in the caster with the lock mechanism according to the present invention, the brake operating lever is attached to the mounting base for fixing the caster to which the caster is mounted, such as a trolley, so that the wheels are The position of the braking operation lever is constant regardless of the direction of the (yoke), and the braking operation lever can be easily operated.

[Brief description of drawings]

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

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

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

[Explanation of symbols]

11 ... Wheels, 12 ... Support yoke, 13 ... Revolving base,
14 ... Mounting base, 15 ... Axis, 16, 17 ... Support disk, 18a, 18b ... Ball, 19 ... Operating lever mounting bracket plate, 21 ... Operating lever, 24 ... OF
F step section, 25 ... ON step section, 26 ... pin,
27a ... Braking stopper surface, 27b ... Non-braking stopper surface, 28 ... Operating pin, 31 ... Operating bar,
32 ... Brake shoe pressing member, 33 ... Locking recess,
34, 35 ... Spindle (pin), 36 ... Braking member, 37 ...
Wheel peripheral surface pressing portion, 39 ... First brake shoe, 40
… Second brake shoe.

Claims (4)

[Claims] 1. A caster in which a swivel base formed on an upper portion of a pair of support yokes that support the wheels of the caster and a mounting base are thrust-bearing by a pivot, and the lateral sides of the mounting base are provided. And an operating lever mounting bracket plate fixed to the mounting base so as to extend to the base, an operating lever pivotally supported by the operating lever mounting bracket plate, and an operating lever provided integrally with the operating lever mounting bracket plate. A stopper member having a braking stopper surface and a non-braking stopper surface, an operating pin that is vertically movably provided coaxially through the axis of the pivot shaft and is biased upward, and a plate-shaped rod body A substantially intermediate portion of which penetrates the side wall of the mounting base and is tiltably provided with the penetrating portion as a fulcrum, and the base end contacts the braking stopper surface and the non-braking stopper surface of the stopper member, The tip is the product The operating bar is locked to the upper end of the pin, and is pivotally attached to the supporting yoke, and is displaced in conjunction with the lifting of the operating pin to disengage from the braking position that pushes the brake shoe against the wheel peripheral surface and the braking release position that separates it. A caster with a lock mechanism, comprising a brake pressing member to be displaced. 2. A caster in which a swivel base and a mounting base, which are formed on the upper part of a pair of support yokes that support the wheels of the caster, are thrust-bearing by a pivot, and the lateral sides of the mounting base are provided. And an operating lever mounting bracket plate fixed to the mounting base so as to extend to the base, an operating lever pivotally supported by the operating lever mounting bracket plate, and an operating lever provided integrally with the operating lever mounting bracket plate. A stopper member having a braking stopper surface and a non-braking stopper surface, an operating pin that is vertically movably provided coaxially through the axis of the pivot shaft and is biased upward, and a plate-shaped rod body A substantially intermediate portion of which penetrates the side wall of the mounting base and is tiltably provided with the penetrating portion as a fulcrum, and the base end contacts the braking stopper surface and the non-braking stopper surface of the stopper member, The tip is the product An operating bar locked to the upper end of the pin; a pressing member pivotally attached to the support yoke and tilting in conjunction with the up-and-down movement of the operating pin; a braking member that expands and contracts up and down by the tilting of the pressing member; A locking portion that is provided above the braking member and that is locked by an annular locking receiving portion that is fixed to the swivel base during expansion and that is released during reduction, and a wheel that is provided below the braking member and that is expanded during expansion. A caster with a lock mechanism, characterized in that it comprises a brake shoe that is pressed against the peripheral surface of the brake shoe and separates when it contracts. 3. An intermediate portion is rotatably supported by a support shaft that is installed between a pair of support yokes, and the bottom surface of the tip portion forms a brake shoe pressing surface, and the opposite side of the brake shoe pressing surface. A brake shoe pressing member having a recess formed in the upper surface of the operating pin for fitting with the lower end of the operating pin, and a plate-like spring member bent in a substantially V-shaped cross section, the base end of which is provided with the pair of supporting members. The braking member includes a braking member pivotally supported by a support shaft provided between the yokes, the braking shoe pressing member being interposed in a V-shaped space of the braking member, and the braking member. A wheel peripheral surface pressing portion formed on one of the V-shaped pieces facing the peripheral surface of the wheel is provided, and the operating bar, the operating pin, and the brake shoe pressing member are operated by the vertical movement of the operating lever. Move up and down, which will not brake the wheels. Lockable casters, characterized in that to perform the dynamic release. The caster with a lock mechanism according to claim 2, wherein the caster has a lock mechanism. 4. A rack is engraved along a lower peripheral surface of a supporting disk supporting the swivel base, and on the other hand, of the V-shaped pieces of the braking member, the other one facing the peripheral surface of the swivel base. A locking projection is provided at the tip 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 supported. The caster with a lock mechanism according to claim 1, wherein the rotation of the yoke is controlled.