JPH0747203Y2 - Casters with rolling prevention device - Google Patents

Description

[Detailed description of the device] [Industrial applications]

The present invention relates to a caster used for a folding aerial work platform such as a rolling tower in which a caster having a brake device is provided with a rolling (turning) prevention function.

[Prior art]

Conventionally, a caster having a brake device as shown in Japanese Utility Model Laid-Open No. 60-15543 or Japanese Patent Laid-Open No. 52-53346 is used in a folding worktable such as a rolling tower used as a scaffold for working at high places. It had been. With this brake device, it is possible to prevent the vehicle from turning while braking the wheels. However, when folding and moving the folding workbench, only the wheels need to rotate without turning, but with conventional casters, when a force different from the center of gravity acts when sliding, the wheels turn left and right. It had the drawback that it would roll over and could not be rotated. Further, in the caster disclosed in Japanese Patent Laid-Open No. 55-72402, braking of the wheels and prevention of turning are performed separately, so when used in a rolling tower, it is necessary to operate both operating levers at the same time, which is complicated. is there.

[Problems to be solved by the device]

This invention was created as a result of earnest research in view of the above circumstances, and its main problem is to brake and turn wheels using a brake device when the casters are used for folding aerial work platforms. Provided is a caster with a roll-prevention device, which prevents the rotation and prevents the turning by using the roll-prevention device when the folding worktable is folded and moved, and can be moved while maintaining the standing posture. There is.

[Means for solving problems]

In order to solve the above problems, the present invention provides (a). A mounting base (3) in which the stem (2) is erected, a rotation base (4) rotatably mounted on the mounting base (3), and a yoke (5) extending from the rotation base (4). )
And a wheel (6) pivotally supported on the tip side of the yoke (5)
And a caster (1) with a rolling prevention device (8) having a brake device (7) provided in front of the wheel (5) for braking rotation, (b). The rolling prevention device (8) includes a pair of holders (81) protruding outward from one side wall surface of the yoke (5) and a cam (82) pivotally supported by the holder (81).
And the operation pedal (83) extending outward from the cam (82) in the extending direction, and being locked by the holder (81), the cam (8)
A brake that is loosely fitted between 2) and the side surface of the mounting base (3) and the yoke (5) so that one end contacts the side surface of the mounting base (3) and the other end contacts the side wall surface of the yoke (5). The brake pedal consists of the shoe (84) and the operating pedal (83) is rotated 180 degrees until it is substantially parallel to the stem (2) to displace the cam (82) and attach the brake shoe (84) to the side surface of the mounting base (3). And York (5)
The wheel (6) is pressed against the side wall surface of the yoke (6) to brake the turning, and the operation pedal (83) is reversely rotated until it is substantially parallel to the side wall surface of the yoke (5) to return the cam (82) and the brake shoe (84). The abutment with the mounting base (3) of (3) is released, (c). The brake device (7) includes a pair of yoke holders (71) protruding from a pair of opposed ends of the yoke (5), a cam (72) pivotally supported by the yoke holder (71), and the cam (72). Brake lever (73) extending outwardly from the cam, the cam (72) and the wheel (6)
The brake plate (74) is loosely fitted to the outer periphery and has one end in contact with the side surface of the mounting base and the other end in contact with the outer periphery of the wheel (6). The brake plate (74) rotates to rotate the cam (73). 72) is displaced to press the brake plate (74) against the side surface of the mounting base (3) and the outer peripheral surface of the wheel (6) to brake the rotation and turning of the wheel (6), and the reverse rotation of the brake lever (73). The cam (72) is returned to release the abutment of the brake plate (74) by (d). The rolling prevention device (8) and the braking device (7)
The technical measures are taken such that and are arranged in a direction substantially orthogonal to each other.

[Action]

The rolling prevention device (8) rotates the operation pedal (83) 180 degrees until it is substantially parallel to the stem (2) to displace the cam (82) and attach the brake shoe (84) to the side surface of the mounting base (3). And the side wall surface of the yoke (5) to press the turning of the wheel (6), and the operation pedal (83) is reversely rotated until it is substantially parallel to the side wall surface of the yoke (5) to return the cam (82). Release the abutment of the brake shoe (84) with the mounting base (3). The brake device (7) displaces the cam (72) by rotating the brake lever (73) to press the brake plate (74) against the side surface of the mounting base (3) and the outer peripheral surface of the wheel (6). The rotation and turning of (6) is braked, and the cam (72) is returned by the reverse rotation of the brake lever (73) to release the abutment of the brake plate (74). Since the rolling prevention device (8) and the braking device (7) are arranged in a direction substantially orthogonal to each other, it is easy to operate individually, and the casters are fixed because a folding worktable such as a rolling tower is used. In the case of the braking device (7),
The wheels (6) are braked and turning is prevented. When the rolling tower is moved in the folded state, the wheels (6) are erected and the operation pedal (83) is rotated to the lock position to regulate the lateral turning of the wheels (6). As a result, the wheels (6) can rotate back and forth without rolling, so that the rolling tower in the folded state can be moved in a stable state.

【Example】

A preferred embodiment of a caster with a rolling prevention device according to the present invention will be described below with reference to the drawings starting from FIG. This caster 1 with an anti-rolling device includes a mounting base 3 on which a stem 2 is erected, a rotary base 4 pivotally mounted on the mounting base 3, and a yoke 5 extending from the rotary base 4.
A wheel 6 pivotally supported on the tip side of the yoke 5, a brake device 7 for braking the rotation of the wheel 6, and a rolling prevention device 8 for preventing the wheel from turning left and right. . That is, in the case of this embodiment, the mounting base 3 is an upper steel ball.
A wheel having a built-in S1 and a lower steel ball S2, a rotary base 4 being interposed between the upper and lower steel balls S1, S2, and being pivotally supported by a yoke 5 extending from the rotary base 4. 6 has a well-known structure that can freely rotate in the left-right direction. A pair of yoke holders 71 project forward from the yoke 5, and a brake cam 72 is pivotally supported on the yoke holder 71 by a cam mounting shaft P1 at an eccentric position. The brake cam 72 is integrally formed with a brake lever 73 extending upward and bent from the center. A brake plate 74 is loosely fitted between the brake cam 72 and the outer peripheral surface of the wheel 6. This brake plate 74, as shown in FIG.
A bracket 74 'is protrudingly provided in the center of the bracket.
74 'is provided with a hole 74 "in which the cam mounting shaft P1 is inserted and play (play) is provided.
P1 is loosely fitted in the hole 74 ″, and the brake plate 74 is attached to the yoke holder.
It is anchored at 71. The upper end of the brake plate 74 is in contact with the side surface of the mounting base 3 and the lower end is in contact with the outer peripheral surface of the wheel 6. With the above configuration, the brake cam 72 is displaced by the downward rotation of the brake lever 73 to press the brake plate 74 to abut against the outer peripheral surface of the wheel 6 to brake the rotation of the wheel 6 and lock the turning. can do. Further, the brake cam 72 is returned by the reverse rotation of the brake lever 73 to restore the brake plate 74 and unlock the lock, and the constraint of the outer periphery of the wheel 6 and the constraint of the mounting base 3 by the brake plate 74 is released to drive the wheel 6. It is rotatable. Therefore, when the caster 1 with a rolling prevention device is used as a caster for a rolling tower or the like, when the work is performed, the brake lever 73 is rotated to the lock position shown by the solid line in FIG. Can rotate the brake lever 73 in the releasing direction and displace it to the position indicated by the chain double-dashed line in the figure so that the wheel can slide. Next, on the side surface of the yoke 5, as shown in FIGS. 2 and 3, a pair of holders 81 are projected in a direction orthogonal to the braking device 7, and the holder 81 is eccentrically positioned by the axis P2. A rolling prevention cam 82 is pivotally supported. An operation pedal 83 extending outward is integrally formed with the rolling prevention cam 82. The rolling prevention cam 82, the mounting base 3 and the yoke 5
Brake shoes 84 are loosely fitted between the side surfaces. In the case of this embodiment, the brake shoe 84 has a holder 81 in which notches 84 'are formed on both sides of the intermediate portion as shown in FIG.
The brake shoe 84 is arranged such that its upper end is in contact with the mounting base 3 and its lower end is in contact with the outer periphery of the yoke 5. With the above-described structure, the operation pedal 83 is displaced to a position substantially parallel to the stem 2 by the rotation of the operation pedal 83 by approximately 180 degrees, and the rolling prevention cam 82 is displaced to the position shown by the solid line in the figure to cause the brake shoe. It is possible to press 72 and make it abut against the mounting base 3 and the side surface of the yoke 5 to brake the turning of the wheel 6 in the left-right direction and to lock the wheel 6 slidably in the standing posture. Further, the operation pedal 83 is reversely rotated so as to be substantially parallel to the side wall surface of the yoke 5 and displaced to the position shown by the chain double-dashed line in FIG. 1, and the rolling prevention cam 82 is returned to the mounting base 3 of the brake shoe 84. Release the abutment with and turn freely in the left and right directions. Therefore, when the rolling tower is moved in a folded state, the wheels 6 are erected and the operation pedal 83 is rotated to the lock position to restrict the lateral turning of the wheels 6. As a result, the wheels 6 can rotate back and forth without rolling, so that the rolling tower in the folded state can be moved in a stable state.

[Effect of device]

Since the present invention has the above-mentioned structure, when the casters are fixed because a folding worktable such as a rolling tower is used, the brake device brakes the wheels and prevents the wheels from turning. At this time, a rolling prevention device may be used together. When the folding worktable such as a rolling tower is folded after the work is completed, the wheel is restricted from turning to the left and right using only the rolling prevention device with a simple operation of the operation pedal to maintain the standing posture. Since the wheels can be rotated without changing, the work table such as the rolling tower can be surely moved freely in the folded posture, which is highly convenient. Further, since the brake device and the rolling prevention device do not intersect and the brake lever and the operation pedal are oriented orthogonally, the respective operations do not intersect, and the operation pedal of the rolling prevention device is upright or Since it is displaced to the position where it hangs down, it does not become bulky and does not get in the way and is excellent in operability.

[Brief description of drawings]

FIG. 1 is a partially cutaway front view showing a preferred embodiment of a caster with a rolling prevention device of the present invention, FIG. 2 is a side view showing the same portion in section, and FIG. 3 is a plan view of the rolling prevention device. FIG. 4 is a main part sectional view showing an example of a loose fitting structure of a brake plate, and FIG. 5 is a main part sectional view showing an example of a loose fitting structure of a brake shoe. 1 …… Caster with rolling prevention device 2 …… Stem 3 …… Mounting base 4 …… Rotating base 5 …… Yoke 6 …… Wheels 7 …… Brake device 71 …… Yoke holder 72 …… Brake cam 73 …… Brake lever 74 …… Brake plate 8 …… Rolling prevention device 81 …… Holder 82 …… Rolling prevention cam 83 …… Operating pedal 84 …… Brake shoe

 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-52-53346 (JP, A) JP-A-55-72402 (JP, A) Actually developed JP-A-60-15543 (JP, U)

Claims (1)

[Scope of utility model registration request] 1. A mounting base (3) having a stem (2) provided upright.
A rotary base (4) rotatably mounted on the mounting base (3), a yoke (5) extending from the rotary base (4), and a pivotal support at the tip side of the yoke (5). Rolling prevention device (8) having a fixed wheel (6) and a brake device (7) provided in front of the wheel (5) for braking rotation.
In the caster (1) with a roll, a rolling prevention device (8) includes a pair of holders (81) protruding outward from one side wall surface of the yoke (5) and a cam (a) axially supported by the holder (81). 82)
And the operation pedal (83) extending outward from the cam (82) in the extending direction, and being locked by the holder (81), the cam (8)
A brake that is loosely fitted between 2) and the side surface of the mounting base (3) and the yoke (5) so that one end contacts the side surface of the mounting base (3) and the other end contacts the side wall surface of the yoke (5). The brake pedal consists of the shoe (84) and the operating pedal (83) is rotated 180 degrees until it is substantially parallel to the stem (2) to displace the cam (82) and attach the brake shoe (84) to the side surface of the mounting base (3). And York (5)
The wheel (6) is pressed against the side wall surface of the yoke (6) to brake the turning, and the operation pedal (83) is reversely rotated until it is substantially parallel to the side wall surface of the yoke (5) to return the cam (82) and the brake shoe (84). The brake device (7) is released from the abutment with the mounting base (3) of the yoke (5), and a pair of yoke holders (71) projecting from a pair of opposite ends of the yoke (5), and the yoke holder (71). ), A brake lever (73) extending outward from the cam (72), a cam (72) and a wheel (6).
The brake plate (74) is loosely fitted to the outer periphery and has one end in contact with the side surface of the mounting base and the other end in contact with the outer periphery of the wheel (6). The brake plate (74) rotates to rotate the cam (73). 72) is displaced to press the brake plate (74) against the side surface of the mounting base (3) and the outer peripheral surface of the wheel (6) to brake the rotation and turning of the wheel (6), and the reverse rotation of the brake lever (73). The cam (72) is returned by means of which the abutment of the brake plate (74) is released, and the rolling prevention device (8) and the braking device (7) are arranged in a direction substantially orthogonal to each other. Casters with rolling prevention device (1).