JPH0733921Y2 - Caster braking system - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to a caster mounted on furniture or the like, and more particularly to a structure of a braking device thereof.

[Conventional technology]

Usually, in this type of braking device, an intermediate portion of a braking lever is pivotally supported in a hollow portion mainly for turning, and an inner tip of the braking lever is engageable with a groove portion formed on an inner peripheral side of a wheel. A restraining piece is formed, and the outward protruding end of the braking lever is operated to rotate the restraining piece so that the restraining piece is locked in the wheel groove portion to perform braking.

[Problems to be solved by the device]

Since the conventional braking device has the above-described configuration, the braking lever is held at the non-braking position in addition to the spring mechanism for biasing the braking lever to the braking position, against the bias of the spring mechanism. In addition to the need for a holding mechanism for the above, it is inevitable that the groove side is also formed on the wheel side to complicate the structure and increase the size.

The present invention has been made in view of the above points, and an object thereof is to provide a braking device having a simple structure that does not require engraving of a groove on the wheel side.

[Means for Solving the Problems]

In order to achieve the above object, a braking device for casters according to the present invention comprises a turning main body that pivotally inserts and supports a vertical shaft having a mounting portion for furniture and the like, at a position deviated from the vertical shaft center to a wheel. In a caster with a supporting shaft that supports
A groove is formed in a stepped shape on the side of the turning body opposite to the vertical shaft supporting portion with respect to the support shaft, and a braking elevating rod is upwardly moved by a spring in a through hole formed in the bottom surface of the groove. It is elastically urged to fit in the groove so that the side part of the braking lever is laterally inserted into the groove so as to abut the bottom surface of the groove and the top surface of the lifting rod, and the middle part of the lever is The lever is pivotally supported by a pin supported between the side walls of the groove portion, and the lever is set so that the lower end surface of the lever can be crimped and held at the lowered grounding position by the lower end surface of the lever when the lever is rotated and erected.

[Action]

Since the present invention has the above-described structure, the supporting shaft is located rearward in the traveling direction from the vertical shaft center and the braking lever is located further rearward than the supporting shaft during traveling. The braking lever is always located on the rear side of the main body of turning, and in the normal state, the braking lever is a braking hoisting rod urged upward by a spring so that the lever side portion is abutted and the braking lever is laid horizontally along the bottom of the groove. The brake lever can be held at the position, and when the brake lever is rotated and erected, the brake lever can be held at the braking position where the lower end surface of the lever is brought into surface contact with the top surface of the elevating rod so that the elevating rod is pressed and held at the descending ground position.

〔Example〕

 The present invention will be described below with reference to illustrated embodiments.

In the figure, (1) is a vertical shaft having an attachment portion for furniture or the like having an upper end formed as a male screw portion, and (2) is a turning main body which rotatably fits and supports the lower portion of the vertical shaft, and the vertical shaft (1 The shaft (4) for supporting the wheels (3), (3) on both sides is laterally mounted at a position deviated from the shaft center of (1).

However, (5) is a groove formed in the swivel main body (2) by forming a stepped notch on the opposite side of the spindle (4) from the vertical shaft bearing, and (6) is this groove ( 5) An elevating rod for braking which is inserted into a through hole (7) formed in the bottom surface of 5), and is stretched between the lower surface of the head of the elevating rod (6) and the intermediate step portion of the through hole (7). It is biased upward by the spring (8). (9) is a cover (10) at the lower end of this lifting rod (6)
A grounding piece, which is preferably made of an elastic material such as rubber, is attached via a braking lever, and (11) is a braking lever having an intermediate portion pivotally supported by a pin (12) supported between both side walls of the groove portion (5). In the example, it is formed in a T shape. In the non-braking position shown in FIG. 1, the brake lever (11) is an elevating rod () that is urged by a spring (8) from below in a horizontal position with the lever side portion along the bottom surface of the groove (5). It is held in contact with the top surface of 6). In the illustrated embodiment, the through hole (7) is surrounded below the swinging main body (2), and the projecting tubular portion (13) is provided. In the non-braking position, the cover (10) below the lifting rod (6) is provided. While contacting the lower surface of the tubular portion (13),
The top surface of the lifting rod (6) is set to be substantially flush with the bottom surface of the groove (5).

Because of the above-described configuration, in this embodiment, if the T-shaped portion of the braking lever (11) is rotated and erected by operating the T-shaped portion with a hand or a foot, as shown in FIG. ) Is pressed by the lower end of the braking lever (11), the braking elevating rod (6) is urged downward in the through hole (7) against the spring (8), and the braking lever (6) is urged downward. The lower end surface of (11) comes into contact with the top surface of the elevating rod (6) and is held in the lowered position by their surface contact. Then, in this lowered position, the grounding piece (9) made of an elastic material provided at the lower end of the lifting rod (6) is pressed against the floor surface to hold the caster in the braking position. To release the braking, the brake lever (11) occupying the position shown in FIG. 4 is stepped down with a foot or the like, and the lifting rod (6) is urged upward by the spring (8), as shown in FIG. Obviously, the immediate return to the non-braking position.

The braking lever (11) is not limited to the T-shape shown in the drawing, but may be a rod-shaped one as long as it has a side surface and a lower end surface.

[Effect of device]

As described above, according to the present invention, during traveling, the support shaft is located on the rear side in the traveling direction from the vertical shaft center, and the braking lever is located further behind the support shaft. Since the braking lever is always located on the rear side of the turning main body, the operation is easy. In addition, since the braking action can be performed simply by operating the braking lever and holding the lifting rod at the lowered installation position, the wheel side does not require any special processing for braking, which simplifies the structure. Can be achieved.

[Brief description of drawings]

Each of the figures shows an embodiment of the present invention,
Figure is a vertical side view of the caster, Figure 2 is its front view, and Figure 3
The figure is a plan view and FIG. 4 is a similar side view shown in a different operating position from FIG. (1) …… Vertical axis (2) …… Mainly turning (3) …… Wheel (4) …… Support shaft (5) …… Groove (6) …… Elevating rod (7) …… Through hole (8) ...... Spring (11) …… Brake lever (12) …… Pin In addition, the same reference numerals in the drawings indicate the same or corresponding parts.

Claims (1)

[Scope of utility model registration request] 1. A caster in which a supporting shaft for supporting a wheel is laterally installed at a position deviated from the vertical shaft center on a revolving main body which rotatably inserts and supports a vertical shaft having a mounting portion for furniture and the like, A groove is formed in a stepped shape on the side of the turning body opposite to the vertical shaft supporting portion with respect to the support shaft, and a braking elevating rod is upwardly moved by a spring in a through hole formed in the bottom surface of the groove. It is elastically urged to fit in the groove so that the side part of the braking lever is laterally inserted into the groove so as to abut the bottom surface of the groove and the top surface of the lifting rod, and the middle part of the lever is A caster braking device, wherein the lever is pivotally supported by a pin supported between the side walls of the groove portion, and the lever is set so that the lower end surface of the lever can be crimped and held at the descending grounding position by the lower end surface of the lever when the lever is turned upright.