JPH03266702A - Castor having automatic braking device - Google Patents

Abstract

PURPOSE: To simplify a structure and to reduce cost by vertically moving a partition wall in relation to wheels through a spring according to the presence or absence of load in relation to a caster, bringing or separating respective hubs into contact with or from brake parts, and braking the wheels or releasing braking. CONSTITUTION: When load is not applied to furniture such as a chair to be supported by a caster, a partition wall 2 and a turning shaft 6 are lifted in relation to wheels 1 by a spring 9. Therefore, hubs 5 of the wheels 1 and wheel brake parts 11 are elastically pressed to obtain the braking effect. While, when load is applied to the caster after a person seats on the furniture such as a chair, the partition wall 2 is pressed down in relation to the wheels 1 against the spring 9. Therefore, elastic pressing of the hubs 5 and the wheel brake parts 11 is released, the braking effect is eliminated, and the wheels are freely rotated. Accordingly, a caster with an automatic brake device can be provided with a simple and inexpensive structure.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a caster equipped with an automatic braking device.

BACKGROUND OF THE INVENTION Casters for office chairs, office furniture, etc. are known; - casters for boats are only capable of rotating. However, recently, when there is no load on the caster, a brake is applied to the caster wheel to make it difficult to rotate, and when a load is applied to the caster, for example, by a person sitting on a chair, the brake is applied to the caster wheel. A caster with a brake device that releases the function of the brake device and can rotate freely has been developed and is well known.

(Problems to be Solved by the Invention) The above-mentioned publicly known casters with a brake device have a relatively complicated structure of the brake device, so the number of parts is large, and the assembly work is troublesome and time-consuming. There was a problem in that these factors led to high costs.

SUMMARY OF THE INVENTION An object of the present invention is to provide a caster with an automatic brake device that has a simple structure by minimizing the number of parts used as a brake device, and that requires assembly work as a component at a low cost.

Furthermore, the casters are equipped with a safe automatic braking system that makes it difficult for the caster wheels to rotate when the chair is not in use, but allows the wheels to rotate freely when the chair is seated correctly, preventing falls. The purpose is to provide.

(Means for Solving the Problems) In order to achieve the above object, the caster with an automatic brake device of the present invention includes two wheels, a bulkhead through which the axles of these wheels pass, and a In a caster that has a vertical shaft insertion part that receives the pivot shaft of the caster provided at a displaced position, the shape of the axle through hole in the bulkhead is slightly oval in the vertical direction, and the bulkhead has a vertical shaft opening to the axle through hole. A hole is provided and a pressure expansion spring for compressing the axle is housed in the hole, and arcuate flange-shaped wheel brake parts are provided at both sides of the lower part of the axle through hole in the bulkhead. The respective hubs of the wheels are configured to be brought into elastic contact by the expansion elasticity of the expansion spring, and when the pressure of the load applied to the pivot shaft increases, the pressure contact of the wheel brake portion with the wheel hub is released. It is something.

(Function) If you use the casters with the automatic braking device configured as described above, the casters will be able to
When no one is sitting and there is no particular load applied, the bulkhead is pushed up against the wheel axle by the spring's expansion elasticity, and the wheel brake part and the wheel hub come into elastic contact, causing the brake The device works and provides a braking effect.

Next, when a person sits on the caster and a special load is applied to the caster, the bulkhead is pushed down against the expanding elasticity of the spring, and the contact between the wheel brake part and the wheel hub is broken and the braking effect is lost.

(Example) Hereinafter, an example of the caster with an automatic brake device of the present invention will be further described with reference to the accompanying drawings.

In the figure, 1 is a wheel, and two wheels 1 are arranged on both sides of a partition wall 2. An axle 4 is passed through the axle through hole 3 of the partition wall 2, and each end of the axle 4 is fitted and fixed to a bearing formed by the hub 5 of the wheel 1. A shaft insertion portion 7 for inserting a pivot shaft 6 is provided at a position of the partition wall 2 displaced with respect to the axle 4.

The axle through hole 3 of the partition wall 2 has a slightly oblong shape in the vertical direction, and the axle 4 can be vertically displaced within the axle through hole 3. A vertical hole 8 opening into the axle through hole 3 is provided in the center of the partition wall 2, and a pressure expansion spring 9 is housed in the vertical hole 8 to press the axle 4.

A through hole 10 is formed in the lower part of the axle through hole 3 at an extension position of the vertical hole 8, and before inserting the axle 4 into the axle through hole 3, the pressure expansion spring 9 is inserted through the through hole 10. Accommodate in 8.

An arcuate flange-shaped wheel brake part 11 is provided at both sides of the lower part of the axle through hole 3 of the partition wall 2, and the hub 5 of the wheel 1 on both sides of the partition wall 2 is brought into contact with this wheel brake part 11. The elastic contact is made by the expansion elasticity of the expansion spring 9. The elastic force of the expansion spring 9 lifts the pivot shaft 6 when furniture such as a chair supported by casters is not under load, and causes the hub 5 of the wheel 1 and the wheel brake part 11 to come into elastic contact. When a person sits and receives a load, the bulkhead 2 is pushed down against the wheel 1, and the hub 5 of the wheel 1 and the wheel brake part 1 are
The size must be such that contact with 1 is released and there is no braking effect.

That is, when furniture such as a chair supported by casters is not under any special load, the bulkhead 2 and the pivot shaft 6 are moved by the expansion elasticity of the expansion spring 9, as shown in FIGS. 1 and 2. It is lifted relative to the wheel 1, and the hub 5 of the wheel 1 and the wheel brake part 11 of the bulkhead 2 come into elastic contact, providing a braking effect.

On the other hand, when a person sits on furniture such as a chair supported by casters and a special load is applied, the partition wall resists the expansion elasticity of the expansion spring 9, as shown in FIGS. 8 and 4. 2
is pushed down relative to the wheel 1, the contact between the hub 5 of the wheel 1 and the wheel brake part 11 is broken, the braking effect disappears, and the wheel 1 can rotate freely.

Although not shown in the drawings, it is effective to make the contact surface of the wheel brake part 11 rough to further enhance the braking effect, and it is also possible to form appropriate irregularities. Further, it is desirable that the partition wall 2 is provided with a wheel cover.

(Effects of the Invention) In the caster with automatic brake device of the present invention, the shape of the axle through hole in the partition wall is slightly oval in the vertical direction, and the partition wall is provided with a vertical hole that opens into the axle through hole. An arcuate flange-shaped wheel brake part is provided at both sides of the lower part of the axle through hole in the partition wall to house the pressure expansion spring, and the hub of the wheel is brought into elastic contact with the wheel brake part by the expansion elasticity of the pressure expansion spring. Because of this structure, compared to casters without a brake device, there is only a pressure expansion spring, the number of parts is extremely small, the structure is simple, and the assembly work is simple, making it possible to create casters with automatic brake devices at low cost. It has the effect that it can provide.

In addition, while the wheels of the casters are made difficult to rotate when the chair is not in use, the wheels can be rotated freely by sitting correctly on the chair, which is effective in preventing dangers such as falls and is a safe automatic We can provide casters with brake devices.

[Brief explanation of drawings]

Fig. 1 is a partially cutaway front view of a caster with an automatic braking device in an unloaded state, taken along the line I-I in Fig. 2, and Fig. 2 is a central vertical sectional side view and Figure 3 is a partially cutaway front view similar to Figure 1 in a loaded state, and Figure 4 above
It is shown along the line -■, and FIG. 4 is a central longitudinal sectional side view in the same loaded state. 3-Axle through hole 4-Wheel 5-Hub 6-1. - Swivel axis 7 - Axis insertion part
8 - Vertical hole 9 - Expansion spring 10 - Through hole 11 - Wheel brake part

Claims (1)

[Claims] two wheels and a bulkhead through which the axles of these wheels pass;
In a caster that has a vertical shaft insertion part that receives the pivot shaft of the caster provided at a position displaced from the axle of the bulkhead, the shape of the axle through hole of the bulkhead is slightly oval in the vertical direction, and the axle is inserted into the bulkhead. A vertical hole opening into the through hole is provided, a pressure expansion spring for compressing the axle is housed in the vertical hole, and arcuate flange-shaped wheel brake parts are provided at both sides of the lower part of the axle through hole in the bulkhead. 2 on the brake part
The hubs of the wheels are configured to come into elastic contact with each other by the expansion elasticity of the expansion spring, and when the pressure of the load applied to the rotation axis increases, the pressure contact of the wheel brake part with the wheel hub is released. Casters with automatic braking device.