JPH08207504A - Caster locking device - Google Patents

Abstract

PURPOSE: To miniaturize the operating pedal of a caster locking device and to certainly lock the rotation and brake the wheel without requiring much power. CONSTITUTION: A caster 10 is composed of a fixed base plate fixed on a mounting shaft 12, a yoke 15 mounted on the mounting shaft in a rotatable manner and rotatably supporting a wheel, and a locking device provided on the upper part of the yoke 15. The locking device is composed of a mounting plate 2 of nearly an angle shaped section, a shoe plate 3 having one of its ends fixed to the mounting plate 2 and being able to press the wheel by being energized outwards, an operating part 5 consisting of an operating pedal 4, and rotation locking parts 7a, 7b, 7c consisting of a second lock constitution part 6 and a restraining piece 8. Thus rotation can be locked by rotation locking parts 7a, 7b, 7c and the wheel can be braked by the operating part 5, while the action of the rotation locking parts 7a, 7b, 7c can be controlled by interlocking them together by displacement of the operating part 5.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of a caster lock device capable of simultaneously turning a caster and braking a wheel.

[0002]

2. Description of the Related Art In a conventional caster, in order to lock the turning and the braking of the wheels at the same time, an integral braking plate is provided to engage with a fixed base fixed to a mounting shaft at the same time as the wheels, and other Various configurations have been proposed, but they all have drawbacks such as a complicated configuration and complicated mounting work. Further, the operation pedal requires a large amount of force to simultaneously lock the turning and brake the wheels, and the size of the operation pedal cannot be avoided.

[0003]

SUMMARY OF THE INVENTION The present invention was devised in view of the above circumstances, and its main problem is that the operation pedal can be downsized and the turning lock and vehicle inspection can be performed without requiring a large force. It is an object of the present invention to provide a caster lock device capable of reliably braking the vehicle. Another object of the present invention is to provide a caster locking device that simplifies the mounting work.

[0004]

In order to solve the above-mentioned problems, according to the present invention, there are provided: (a) a fixed base fixed to a mounting shaft, and a wheel mounted on the mounting shaft so as to be rotatable. A caster consisting of a supported yoke part, which locks the caster by locking the turning of the yoke and braking the wheel, (b). (C) The shoe has a cam surface that is pivotally attached to the yoke part and that is displaceable between a braking position that presses the shoe plate against the wheel and a standby position that separates from the wheel. And an operating portion in which an operating pedal biased in each direction by the shoe plate at the release position is arranged outward, (d). A first locking component portion formed on the outer periphery of the fixed base is provided, (e). Pivotally attached to the yoke part and engageable with the first locking component part A second locking component is provided, and a biasing means for biasing the second locking component in the engaging direction is provided, and the second locking component is abutted at the release position of the operation part to be displaced in the swing lock releasing direction. , A restraining piece which is released at the braking position of the operating portion and displaces the second locking component part to the first locking component part by the biasing force of the biasing means so as to engage with the first locking component part. , Is taken as a technical means. According to the invention of claim 3, in addition to the above-mentioned configuration, (f). A mounting hole is provided in the top surface of the yoke part, a mounting plate having a substantially angled cross section is fitted, and the swiveling is performed through the mounting plate. The lock portion and the operation portion are pivotally attached to the yoke portion, respectively,
The shoe plate has a base end fixed to the back surface of the mounting plate.
I am taking the technical means of.

When the casters are locked, the operation pedal is depressed in the braking direction. As a result, the cam surface of the operating portion presses the shoe plate to press the shoe plate against the trad surface of the wheel for braking. Due to the displacement of the operating portion, the constraint of the swing lock portion is released, the operating portion is displaced in the engaging direction by the urging force of the urging means, and the second locking structure portion is the first locking structure of the fixed base. The part is engaged to lock the swing. When the lock is released, the cam surface can displace the shoe plate away from the trad surface by returning the operation pedal to the release direction. Further, since the swing lock portion is displaced in the swing release direction by the displacement of the operation portion, the second locking component part is separated from the first locking component part, and the fixed base or the mounting shaft is rotatably released. It Further, if the operation portion and the swing lock portion are arranged on the attachment plate to which the shoe plate is attached and they are integrally attached to the yoke portion by the respective pivots, the attachment work can be easily performed.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION Preferred embodiments of a caster lock device of the present invention will be described below with reference to the drawings. The caster 10 shown in FIG. 1 to FIG.
2, a fixed base 13 fixed to 2 and a yoke portion 15 pivotally mounted on the mounting shaft 12 and pivotally supporting a wheel 14.
And a lock device 1 provided above the yoke portion 15.

As clearly shown in FIGS. 4 and 5, the lock device 1 has a mounting plate 2 having a substantially angled cross section, and one end fixed to the mounting plate 2 and urged outward (upward in the drawing). 14
It comprises a shoe plate 3 that can be pressed against, an operating portion 5 having an operating pedal 4, and a swing lock portion 7 having a second locking component portion 6 and a restraining piece portion 8.

That is, the operation portion 5 is provided with the operation pedal 4 on the upper surface of a main body 5a having a U-shaped cross section having a hole for a pivot.
On the lower surface of the main body 5a, cam surfaces 51, 5 having a V-shaped cross section
2 is formed. As shown in FIG. 4, the cam surface 51 on the one side is displaced by the displacement of the operating portion 5 during braking.
And the shoe plate 3 made of a leaf spring is pushed down to press the trad surface of the wheel 14 for braking.

Further, as shown in FIG. 5, the cam surface 52 separates from the wheel 14 and comes into contact with the shoe plate 3 due to the displacement when the operating portion 5 is released, so that the shoe plate 3 is returned to the outside. be able to. At this time, since the shoe plate 3 is always biased outward and the cam surfaces 51 and 52 are in surface contact with each other, the operating portion 5 is biased in the respective directions at the braking position and the releasing position. And is held in that position.

Next, the turning lock portion 7 includes a pair of left and right bracket portions 7a having a hole for a pivot, and the bracket portions 7a and 7b.
a tubular portion 7b arranged rearward of a and opening downward;
It is composed of a lever portion 7c formed on the upper part. A recoil spring S placed on the bottom surface of the mounting plate 2 is fitted into the tubular portion 7b and always biases the swing lock portion 7 in the swing lock direction. Also, the lever portion 7
In the front of c, a second locking component 6 is formed which is bulged upward, has a curved front end, and is formed in an uneven shape having a continuous cross section.

The second locking structure 6 is formed by the fixed base 1
The pitch is set so that the first locking component 9 having a series of lateral cross-sections continuously formed on the outer periphery of the groove 3 and the first locking component 9 engages on one side thereof (see FIG. 2). Therefore, the second locking component 6 can be engaged with the first locking component 9 at any position of the fixed base 13.

A restraining piece 8 extends rearward of the lever portion 7c. When the operation pedal 4 is displaced to the release position, the restraining piece portion 8 is pushed down by the tip of the restraining piece portion 8 to rotate the front second locking component portion 6 upward,
It is displaced in the disengagement direction away from the first locking component 9. Then, since the operation pedal 4 is held in the release position by the urging force of the shoe plate 3, the second locking component 6 is similarly held in the release position via the restraining piece 8.

On the other hand, when the operation pedal 4 is displaced to the braking position, the tip of the operation pedal is rotated upward to release the restraining piece portion 8. As a result, the swing lock portion 7 is rotated in the engagement direction by the urging force of the recoil spring S, and the second locking component portion 6 is
Engage with the first locking component 9.

In this embodiment, a mounting hole 15a is provided in the front surface of the yoke portion 15, the mounting plate 2 is fitted therein, and the swing lock portion 7 and the operating portion 5 are fitted in the mounting plate 2. The yoke 15 is attached to the side wall of the yoke portion 15 together with the attachment plate 2 by a pivot P1 pivotally supporting the turning lock portion 7 and a pivot P2 pivotally supporting the operation portion 5. In the illustrated example, the shoe plate 3 has a braking surface 31 projecting downward at the tip, and is pressed against the ground contact surface of the wheel 14 by operating the operation unit 5.

With the above structure, the operation pedal 4 is depressed in the braking direction when the casters are locked. As a result, the cam surface 51 of the operating portion 5 presses the shoe plate 3 to press the braking surface 31 against the trad surface of the wheel for braking.

By the upward displacement of the tip of the operation pedal 4, the restraint piece 8 of the swing lock portion 7 is released from the restraint, and the swing lock portion 7 is displaced in the engaging direction by the urging force of the recoil spring S. The locking component 6 is the first of the fixed base.
The yoke 15 is locked by engaging with the locking component 9.

At the time of unlocking, when the operation pedal 4 is returned in the releasing direction so that the tip end faces downward, the cam surface 52 displaces the shoe plate 3 in the direction away from the trad surface.
Further, due to the displacement of the operation pedal 4, the restraining piece portion 8 of the swing lock portion 7 is restrained against the urging force of the recoil spring S and is displaced in the swing release direction. The fixed base plate 13 to the mounting shaft 12 are pivotally released from the first locking component 9.

[0018]

According to the present invention, the turning is locked by the turning lock part, the wheel is braked by the operating part, and the operation of the turning lock part is controlled by the displacement of the operating part. The braking of the wheels and the locking of the turning can be simultaneously performed only by operating the operation unit. As a result, the user only has to operate the operation section, so that the operation pedal can be downsized and the operation force can be reduced. Further, if the mounting plate having the shoe plate is used, the operating portion and the swing lock portion can be fastened together with the yoke portion by using the pivot shaft, which facilitates the mounting work.

[Brief description of drawings]

FIG. 1 is a side view showing a preferred embodiment of a caster according to the present invention.

FIG. 2 is a plan view of the same.

FIG. 3 is a front view of the same.

FIG. 4 is a cross-sectional view of essential parts showing a locked state.

FIG. 5 is a cross-sectional view of an essential part showing an unlocked state.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Locking device 2 Mounting plate 3 Shoe plate 4 Operating pedal 5 Operating part 6 Second locking component 7 Swiveling lock part 8 Restraint piece 9 First locking component 10 Castor 12 Mounting shaft 13 Fixed bed 14 Wheel 15 Yoke Department

Claims (4)

[Claims] 1. A caster comprising a fixed base fixed to a mounting shaft, and a yoke portion pivotably mounted on the mounting shaft and pivotally supporting a wheel, wherein the yoke locks the turning of the wheel and the wheel. In a device that locks a caster by braking, one end is fixed to a yoke part and is biased outwardly to be pressed against a wheel, and a shoe plate is pivotally attached to the yoke part to press the shoe plate against the wheel. An operating part that has a cam surface that can be displaced between the braking position and the standby position away from the wheels, and that has operating pedals that are urged in the respective directions by the shoe plate at the braking position and the releasing position to the outside, and a fixed base. A first locking component formed on the outer periphery of the board, and a second locking component pivotally attached to the yoke part and engageable with the first locking component, and the second locking In addition to having a biasing means for biasing the constituent portion in the engaging direction, The second locking component is engaged with the first locking component by the urging force of the urging means, which is disengaged in the turning lock releasing direction by abutting at the releasing position of the working part and released at the braking position of the operating part. A caster lock device comprising: a swing lock portion having a restraining piece portion that is displaceably fitted. 2. The caster lock according to claim 1, wherein the cam surface is formed in a V shape so as to come into surface contact with the shoe plate corresponding to a braking position or a releasing position of the operation pedal. apparatus. 3. A mounting hole is provided on the top surface of the yoke part to fit a mounting slope having a substantially angled cross section, and the swing lock part and the operating part are pivoted to the yoke part by pivots through the mounting plate. The caster lock device according to claim 1, wherein the shoe plate is attached to the back surface of the mounting plate, and the base end of the shoe plate is fixed to the back surface of the mounting plate. 4. The swivel lock portion has a downward hole, and a recoil spring placed on a mounting plate is fitted into the swivel lock portion to bias the swivel lock portion in the engaging direction. The caster locking device according to Item 3.