KR20080005395U - Chair Caster - Google Patents

Abstract

The present invention relates to a caster installed on a chair leg, which is made of a semi-closed form with the bottom open, and has a pair of storage portions formed with guide grooves formed in a vertical direction on the sides protruding downwardly and facing each other therein. First body; A second body coupled to a bottom surface of the first body and having a pair of shaft supports fitted into the receiving unit, and having a drawing hole formed between the pair of shaft supports and communicating up and down; A wheel disposed between the first body and the first body, a portion of which is selectively exposed through the outlet hole; A shaft fitted to a rotation center of the wheel and supported by the shaft support part; And springs mounted on the pair of storage units, respectively.

Chair, caster

Description

Chair Caster {Chair Caster}

1 is an exploded perspective view of a caster for a conventional chair,

2 is a cross-sectional view of the caster for the chair shown in FIG.

3 is an exploded perspective view of the caster for a chair according to the first embodiment of the present invention,

4 is a coupling diagram of the caster for the chair shown in FIG.

5 is a cross-sectional view of the caster for chair shown in FIG.

6 is a cross-sectional view of a caster for a chair according to a second embodiment of the present invention,

7 and 8 are cross-sectional views of the caster for a chair according to the third embodiment of the present invention.

<Description of Symbols for Major Parts of Drawings>

100: caster 10: the first body

12: storage unit 16: guide groove

20: second body 22: support

24: drawer 30: wheels

35: shaft 40: spring

50: connecting member 60: bolt

80: buffer member

The present invention relates to a caster to be installed on the chair leg, and more particularly to a caster for a chair in which the wheel haunted downward depending on whether the user is seated.

In general, the chair is fixed to the ground through four legs. These chairs are stable because there is no shaking and movement since the legs and the ground contact each other by friction. However, as mentioned above, since the chair is in contact with the ground by friction as mentioned, noise occurs when the chair is dragged, and the movement of the chair is not easy.

For the same reason as above, in recent years, many chairs are equipped with wheels or casters. Chairs with casters are in contact with the ground and are very free to move. Therefore, it is mainly used in offices with a large amount of movement while the user is seated.

However, the chair provided with the caster can be moved in any direction by the caster irrespective of the intention of the seated occupant, so it is not suitable for students studying or those who are engaged in a business that requires concentration.

In recent years, casters (hereinafter referred to as 'prior art') have been developed to selectively move and fix several inconveniences. 1 is an exploded perspective view of a conventional caster for a chair, and FIG. 2 is a cross-sectional view of the caster for a chair shown in FIG. 1.

As shown in FIGS. 1 and 2, the conventional technology includes an outer cover 210, an inner cover 220 mounted inside the outer cover 210, and wheels installed on the inner cover 220. 230, a shaft 250 installed between the outer cover 210 and the inner cover 220, the spring 240 installed through the outer cover 230, and the inner cover 220 to fix the wheel 230. ), And guide pins 260 for guiding vertical movement of the inner cover 220.

In the prior art configured as described above, the wheel 230 installed on the inner cover 220 is protruded downward of the outer cover 210 by the elasticity of the spring 240 to facilitate the movement of the chair, but the user is seated on the chair. There is an advantage that the wheel 230 enters the inside of the outer cover 210 so that the chair does not move arbitrarily.

However, this prior art requires that the shaft 230 of the wheel 230 be installed through the outer cover 210 and the inner cover 220 at the same time, the assembly process is very difficult and difficult. In addition, in the prior art, a separate fixing member such as a guide pin 260 must be installed between the outer cover 210 and the inner cover 220 for the stable up and down movement of the inner cover 220, so that the assembly process is complicated. Do.

In addition, in the prior art, when the guide pin 260 is separated or damaged, the vertical movement of the inner cover 220 is not smoothly performed, and thus, the wheel 230 may not be stably placed or not depending on whether the user is seated. .

In addition, the prior art can not arbitrarily adjust the size of the elastic force of the spring, so that the wheel 230, depending on the weight of the seat occupant has a problem in which the appearance of the seated person (for example, small children sit down) Occation).

The present invention is to solve the problems as described above, the object of the assembly and assembly process is simple, and to provide a caster for a chair smooth movement up and down.

In addition, the present invention has an object to provide a caster for a chair that can adjust the size of the elastic force of the spring according to the weight of the seated person.

According to an embodiment of the present invention, the bottom surface is formed in a semi-closed form, the first body having a pair of receiving portions formed with a guide groove formed in the vertical direction protruding downwardly and facing each other in the longitudinal direction therein; A second body coupled to a bottom surface of the first body and having a pair of shaft supports fitted into the receiving unit, and having a drawing hole formed between the pair of shaft supports and communicating up and down; A wheel disposed between the first body and the first body, a portion of which is selectively exposed through the outlet hole; A shaft fitted to a rotation center of the wheel and supported by the shaft support part; And it is provided with a chair caster comprising springs respectively mounted to the pair of housing.

Preferably, between the spring and the shaft, one end is formed to be convex, the other end is preferably provided with a connection member is formed concave.

In addition, the first body is preferably provided with a tension adjusting means for adjusting the tension of the spring mounted on the receiving portion.

In addition, the tension adjusting means is preferably a bolt that is installed vertically penetrating through the receiving portion from the upper surface of the first body.

In addition, the wheel is preferably provided with a bearing to reduce the friction with the shaft.

In addition, the bottom surface of the second body is preferably provided with a buffer member to reduce the impact and noise.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

3 is an exploded perspective view of the chair caster according to the first embodiment of the present invention, Figure 4 is a coupling diagram of the chair caster shown in Figure 3, Figure 5 is a cross-sectional view of the chair caster shown in FIG. .

Chair caster 100 according to the first embodiment of the present invention is composed of a first body 10, the first body 20, the wheel 30, and a spring 40, as shown in FIG. do.

The first body 10 is generally in the form of a hemisphere that is convex upward. A sufficient space is formed inside the first body 10 to accommodate the wheel 30, and a pair of accommodating parts 12 may be formed to accommodate the spring 40. The pair of storage portions 12 protrude downward side by side. Each storage portion 12 has an open bottom surface. On the side surface (facing surface of each other) of the accommodating part 12, the guide groove 16 extended in the up-down direction is formed. In addition, a fastening portion for fastening with the second body 20 is formed in the first body 10. The first body 10 configured as described above is fixed to the leg of the chair through the means, such as bolts, screws.

The second body 20 is generally cylindrical in shape with a low height. In the interior of the second body 20, a pair of supporting portions 22 and one drawing hole 24 are formed. The pair of supporting parts 22 protrude side by side upward of the second body 20. The upper surface of the supporting portion 22 is formed to be concave to support the shaft 35 of the wheel (30). The pair of supporting parts 22 formed as described above is disposed at a position corresponding to the receiving part 12 of the first body 10 in the second body 20, and the first body 10 and the second body ( 20 is inserted into the receiving portion 12 or substantially in contact with the receiving portion 12 when the coupling. The lead-out hole 24 is positioned between the pair of support portions 22 and is formed long in a direction perpendicular to the arrangement direction of the pair of support portions 22. The wheel 30 protrudes into the drawing hole 24. On the other hand, the second body 20 is formed with a fastening portion into which the bolt is inserted similarly to the first body 10. The second body 20 configured as described above is coupled to the first body 10 through a bolt.

The wheel 30 is disposed in a sealed space formed by combining the first body 10 and the second body 20. At the center of rotation of the wheel 30, the shaft 35 is coupled to protrude to both sides of the wheel (30). The wheel 30 is installed on the support 22 of the second body 20 via the shaft 35 protruding from both sides, and rotates about the shaft 35.

The springs 40 are installed in the pair of storage portions 12, respectively. One end of the spring 40 contacts the inner surface of the first body 10 (more specifically, the upper inner surface of the housing 12), and the other end contacts the shaft 35 of the wheel 30. do. The spring 40 installed as described above serves as an excuse to push the wheel 30 downward (that is, in the direction of the ground) through the shaft 35.

Chair caster 100 configured as described above is usually shown in Figures 4 and 5, the wheel 30 by the elasticity of the spring 40 through the outlet hole 24 of the second body 20 It protrudes and makes cloud contact with the ground. Therefore, the chair equipped with the caster 100 of the present invention is easy to move during normal times (that is, when the user is not seated on the chair).

However, when the user is seated on a chair (not shown), the load applied to the chair is transmitted as it is to the caster 100 through the chair's legs, so that the wheel 30 is pressed and the spring 40 is compressed. Therefore, in this case, the caster 100 does not slide or move in surface contact with the ground (contact between the lower surface of the second body 20 and the ground).

The caster 100 of the present invention that operates as described above, because the wheel 30 is selectively sunk depending on the action of the load, it can provide both features of the mobility and stability required in the use of the chair.

In addition, the caster 100 of the present invention has a simple assembly structure of the wheel 30 and the spring 40 to apply the elastic force to the wheel 30 to move up and down according to the load, unlike the prior art, easy assembly and robust Do.

On the other hand, the bottom surface of the second body 20 is further attached to the buffer member 80 made of rubber or synthetic resin to increase the contact between the second body 20 and the ground, and to absorb the shock transmitted through the chair Can be. In addition, a bearing for smoothly rotating the wheel 30 may be further installed at a contact portion between the wheel 30 and the shaft 35.

Next, another embodiment of the present invention will be described. 6 is a cross-sectional view of a chair caster according to a second embodiment of the present invention, Figures 7 and 8 is a cross-sectional view of a chair caster according to a third embodiment of the present invention. For reference, the same configuration as the first embodiment uses the same reference numerals, and detailed description of these components is omitted.

The caster for chair 100a according to the second embodiment further includes a connecting member 50 in the form of the first embodiment, as shown in FIG. 6, through which the spring 40 and the shaft 35 come into contact with each other. Improved.

The connecting member 50 is generally cylindrical in shape with a low height. At one end of the connecting member 50, a protrusion 52 is formed to be fitted inside the coil spring 40, and at the other end of the connecting member 50 to smoothly contact the circumference (or circumferential surface) of the shaft 35. Concave grooves 54 are formed. Therefore, when the connecting member 50 is installed between the shaft 35 and the spring 40 of the wheel 30, the connecting member 50 is in wide contact with the circumference of the shaft 35 and one end of the spring 40 The force acting between the spring 40 and the shaft 35 can be transmitted smoothly.

That is, the wheel 30 can compress the spring 40 by stably transmitting the load acting on the chair to the spring 40 through the shaft 35, and the spring 40 has the elastic force of the shaft 35. By transmitting to the wheel 30 through the wheel 30 can protrude to the outside (bottom) of the second body (20).

The caster for chair 100b according to the third embodiment further includes an elastic force adjusting bolt 60 in the form of the first embodiment, as shown in FIGS. 7 and 8, to arbitrarily size the elastic force of the spring 40. You can adjust it as you like.

The elastic force adjusting bolt 60 is fastened to the receiving portion 12 of the first body 10. The bolt 60 is fitted downward from the upper portion of the receiving portion 12 and in contact with the upper surface of the spring 40.

In such a configuration, when the bolt 60 is rotated in one direction and moved downward, the spring 40 is compressed by the bolt 60, and when the bolt 60 is moved upward in the other direction, the compressed spring ( 40) elongate again.

Therefore, when a person who weighs a relatively large amount of weight sits on the chair, the spring 40 is compressed by turning the bolt 60 in one direction to increase the elastic force of the spring 40, and a person who weighs relatively less (child) In this sitting, in order to reduce the elastic force of the spring (40) by turning the bolt 60 in the other direction to make the spring (40) in an extended state.

By adjusting the compression state of the spring 40 as described above, it is possible to give a shock absorbing function to the chair through the variable elastic force of the spring 40, even if a light weight person is seated on the chair 30 It can be smoothly entered into the body of the caster (100b).

According to the present invention, the assembly structure of the wheel 30 and the spring 40 which exerts an elastic force on the wheel 30 move up and down according to the load is simple, so that the assembly is easy and robust.

In addition, the present invention can arbitrarily adjust the size of the spring elastic force according to the load to be applied to the chair, it is possible to ensure the accurate movement of the wheel up and down.

Although the present invention has been shown and described with respect to specific preferred embodiments, the present invention is not limited to the above-described embodiments, and those skilled in the art to which the present invention belongs will have the following utility model registration claims Various modifications can be made without departing from the spirit and scope of the technical idea of the present invention.

Claims (6)

A first body having a semi-closed shape with an open bottom, and having a pair of receiving portions formed therein with a guide groove formed in a vertical direction on the sides protruding downwardly and facing each other; A second body coupled to a bottom surface of the first body and having a pair of shaft supports fitted into the receiving unit, and having a drawing hole formed between the pair of shaft supports and communicating up and down; A wheel disposed between the first body and the first body, a portion of which is selectively exposed through the outlet hole; A shaft fitted to a rotation center of the wheel and supported by the shaft support part; And Chair caster including springs respectively mounted to the pair of housing. The method according to claim 1, Between the spring and the shaft, one end is formed convex, the other end is a chair caster characterized in that it is further installed concave formed. The method according to claim 1 or 2, Chair caster, characterized in that the first body is further provided with a tension adjusting means for adjusting the tension of the spring mounted to the receiving portion. The method according to claim 3, The tension adjusting means is a chair caster, characterized in that the bolt is installed to penetrate vertically from the upper surface of the first body to the housing. The method according to claim 3, Chair caster, characterized in that the wheel is provided with a bearing to reduce the friction with the shaft. The method according to claim 3, Chair caster, characterized in that the bottom of the second body is further provided with a cushioning member to reduce the impact and noise.

Images