KR101037763B1 - Caster for chair - Google Patents

Abstract

An object of the present invention is to move the chair while the user is sitting on the chair as in a conventional swivel chair, and at the same time can prevent the movement of the chair when the user is sitting on the chair while the switch member is locked, The structure is simple, can be easily used, to reduce the manufacturing cost, and to provide a caster for a chair that is easy to maintain and repair.

Chair casters

Description

Caster for chair {CASTER FOR CHAIR}

1 is an exploded perspective view showing a conventional caster for chairs,

2 is a longitudinal cross-sectional view of FIG.

Figure 3 is a longitudinal cross-sectional view illustrating a state in which the post is inserted into the chair in Figure 1,

Figure 4 is a perspective view of the chair caster according to one embodiment of the present invention,

5 is a rear perspective view of FIG. 4;

6 is an exploded perspective view showing an exploded chair caster according to an embodiment of the present invention;

Figure 7 is a longitudinal cross-sectional view of a state in which the locking member in the caster for a chair according to one embodiment of the present invention is released so that the wheel can be rotated even when the user is sitting on the chair.

8 is a longitudinal cross-sectional view showing a state in which the locking member in the caster for a chair according to an embodiment of the present invention is locked and the cover is not in contact with the indoor floor and the wheels are not rotated when the user is sitting on the chair.

FIG. 9 is a longitudinal cross-sectional view of one side wheel in a state in which the locking member of the caster for a chair according to one embodiment of the present invention is released to rotate the wheel even when the user is sitting on a chair.

10 is a longitudinal cross-sectional view of the locking member in the caster for the chair according to one embodiment of the present invention, when one side of the chair is locked and the cover is contacted with the indoor floor to remove one wheel while the wheel is not rotated. It is also.

<Explanation of symbols for the main parts of the drawings>

1a: left wall 1b: right wall

2a, 1b: Major 3: holding

3a: threaded portion 4: through hole

5: round projection 6: screw hole

7: Back side through hole 8: Air exhaust hole

10: housing body 20: switch member

21: Left wall part 21a, 22a: Cutting part

22: Right wall part 23: Front side protrusion

24: Rear side projection 30: Shaft

40: wheel 50: elastic member

60: operating member 70: cover

71: Through hole 80: Tightening bolt

The present invention relates to a chair caster, and in particular, the user can move the chair while the user is sitting on the chair, such as a conventional rotating chair, and at the same time the movement of the chair when the user sits on the chair with the switch member locked The present invention relates to a chair caster that is capable of preventing the fire, is simple in structure, can be easily used, can reduce manufacturing cost, and is easy to maintain and maintain.

A chair caster which has been widely used in the related art is disclosed in Publication No. 1989-0013009 (published date; August 08, 1989) of JP-A.

Chair caster disclosed in the publication No. 1989-0013009 of the Utility Model Publication of the public utility model of the struts (1) in which the projections 2 and the projections 3 integrally as shown in Figs. The groove (4) is concave on the top and the elastic stop ring (5) is inserted and the upper and lower bear surfaces (6) and (7) are replaced with a certain distance under the support (1), but the upper bear surfaces (6) are lower. The outside diameter is slightly larger than that of the bear (7), and the bearing (8) and the support piece (9) are inserted into the protrusions (2), the washer (10) is inserted into the bottom of the support piece (9), and the upper bear under the washer (10). The inner diameter of the metal fixing ring 11 is inserted into the lower surface 6 by slightly inserting the metal fixing ring 11 whose inner diameter is slightly smaller than the outer diameter of the upper 6 surface, and the metal fixing ring 11 is inserted. The support 12 is also forcedly inserted into the lower lower surface 7 and the reinforcing cap 15 is installed on the lower side of the lower end of the narrow strip 14 which is installed as a spring 13 on the support piece 9.

1 to 3, 16 is a roller, 17 is a shaft rod, 18 is a pin rod, 19 is a locking rod, 20 is a chair leg, 21 is a caster insertion hole formed in the chair leg, 22 is a locking groove.

In the conventional caster for chairs configured as described above, since the prop 1 is raised and the roller 16 is lowered by the spring force of the spring 13, the chair is free to move and the weight of the spring 13 ), The support (1) is lowered to support the load of the person and the chair is pressed when the support (1) is pushed into the insertion hole (21) of the chair leg (20) when the caster is mounted on the chair stop ring ( 5) is slightly compressed and entered into the locking groove 22, the stop ring (5) is re-expanded by the elastic, so that the caster is inserted into the chair leg 20 without falling out.

Therefore, assembling is very quick and easy, and since the formation of the spiral is not easy, the manufacture of the support 1 is easy and there is no fear of loosening. The support piece 9 is simply pushed upward by the spring force of the spring 13 so that the bearing (8) and by inserting the washer (10) instead of the bearing on the lower side, the assembly work to install the bearings on the upper and lower parts without any operational troubles is quick and easy, the production cost is low, and the upper metal bear ring (6) (11) is inserted, so the work is much faster than screwing the fixing nut on the spiral, and productivity is high and there is no fear of being relaxed.The support (12) is also inserted into the lower side of the bear (7), so it is not in use. The reinforcement cap 15 has an effect of reinforcing the end of the narrow strip 14 to increase the firmness and at the same time make the appearance very beautiful.

The conventional caster for a chair configured as described above has a problem in that even when the user sits on the seat of the chair, the roller 16 is rotated to fix the chair at a predetermined position.

In order to solve this problem, U.S. Patent No. 6,419,319 (notice date; July 16, 2002) and Japanese Patent No. 3180249 (registration date; April 20, 2001) operate the wheel at no load and at the same time. Disclosed is a wheel device in which a wheel is moved out of a type of wheel, in which a wheel is moved out of a load.

By the way, the conventional wheel device configured as described above has the effect of being able to set both the deportation state and the depreciation state, but there is a problem in that the structure is complicated and requires a lot of maintenance and repair costs, and the structure is complicated, thereby reducing the manufacturing cost. There were various problems, such as not being able to save.

Accordingly, the present invention has been made to solve the above various problems, the object of the present invention is to move the chair while the user is sitting on the chair, such as a conventional swivel chair, and at the same time the user in the locked state of the switch member It is to provide a chair caster that can prevent the movement of the chair when the sitting on the chair.

Another object of the present invention is to provide a caster for a chair that is simple in structure and easily usable.

Another object of the present invention to provide a caster for a chair that can reduce the manufacturing cost.

It is another object of the present invention to provide a caster for a chair that is easy to maintain / repair.

In order to achieve the above object, the caster for the chair of the present invention has a long hole in the vertical direction on the left and right walls, respectively, symmetrically with each other, the lower part is open, screwed to the outer circumferential surface to be coupled to the leg of the chair fixed to the upper side And a switch member inserted into the through hole formed in the front surface of the housing body to block the cushioning force when the front protrusion protrudes, and to control the cushioning force when the rear protrusion protrudes. And a shaft which is rotatably fitted to the inverted U-shaped cutting part respectively formed to face the long hole formed in the left and right walls of the housing main body and the left and right wall portions of the switch member, respectively, on both ends of the shaft. A pair of wheels and a circular protrusion formed downward from the inner upper portion of the housing main body When the front projection of the switch member protrudes from the through hole of the elastic member, the elastic member for elastically supporting the shaft and the concave groove for accommodating the elastic member are formed in the upper portion, and the lower portion of the concave groove is formed in the upper portion. A through-hole through which the shaft penetrates is formed to support the shaft upwardly and downwardly in the long hole of the housing body as the elastic member contracts and expands, and a cover covering the lower opening of the housing body; And a fastening bolt which penetrates the through hole formed in the cover and is screwed into the screw hole formed inside the housing main body to fix the cover to the housing main body.

Hereinafter, a chair caster according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

Figure 4 is a perspective view of the chair caster according to an embodiment of the present invention, Figure 5 is a rear perspective view of Figure 4, Figure 6 is an exploded view of the chair caster according to an embodiment of the present invention 7 is an exploded perspective view, FIG. 7 is a longitudinal cross-sectional view of a state in which a locking member of a chair caster according to an embodiment of the present invention is released so that a user can rotate a wheel even when the user is sitting on a chair, and FIG. In the chair caster according to an embodiment of the locking member is locked, when the user is sitting on the chair, the cover is in contact with the indoor floor is a longitudinal cross-sectional view showing a state that the wheel does not rotate, Figure 9 The locking member in the caster for the chair according to the embodiment is released so that one side of the wheel can be removed while the user can rotate the wheel even when the user is sitting on the chair. Figure 10 is a locking member in the caster for a chair according to an embodiment of the present invention when the user is sitting on the chair is locked, the cover is contacted to the floor of the room to remove the one wheel in the state that the wheel does not rotate Longitudinal section.

As shown in FIGS. 4 to 10, the casters for chairs according to the embodiment of the present invention have long holes 2a and 2b formed on the left and right side walls 1a and 1b in a symmetrical direction, respectively. Is opened, a housing main body 10 having a support 3 formed with a threaded portion 3a on its outer circumferential surface to be coupled to and fixed to a leg of a chair (not shown) on the upper one side, and a penetration formed in the front of the housing main body 10. A switch member 20 inserted into the ball 4 to block the cushion force when the front protrusion 23 protrudes, and to have a cushion force when the rear protrusion 24 protrudes, and the housing body ( Inverted U-shaped cut portions formed to face each other in the long holes 2a and 2b formed in the left and right walls 1a and 1b and the left and right wall portions 21 and 22 of the switch member 20, respectively. A shaft 30 rotatably fitted to 21a and 22a, and a pair provided at both ends of the shaft 30, respectively. The front side of the switch member 20 from the through hole 4 of the housing main body 10 is fitted to the wheel 40 and the circular projection 5 formed from the inner upper portion of the housing main body 10 toward the lower side. When the protrusion 23 protrudes, an elastic member 50 for elastically supporting the shaft 30 and a concave groove 61 accommodating the elastic member 50 are formed thereon, and A through hole 62 through which the shaft 30 penetrates is formed in the lower portion of the concave groove 61 so that the housing 30 may be formed in the long holes 2a and 2b of the housing body 10 as the elastic member 50 contracts and expands. An operating member 60 supporting the shaft 30 upwardly and downwardly, a cover 70 covering a lower opening of the housing body 10, and a through hole 71 formed in the cover 70. The cover 70 is screwed into the screw hole 6 formed inside the housing main body 10 and penetrates the housing main body 10. It consists of a fastening bolt 80 to secure the installation.

The switch member 20 is formed with the inverted U-shaped cutting parts 21a and 22a facing each other and disposed in parallel at regular intervals, and the left and right wall parts 21 and 22, and the left and right wall parts. The front side protrusion 23 integrally formed at the front side of the front side 21 and 22 so that the housing body 10 can be installed in the through-hole 4 of the housing main body 10, and the left and right side wall portions 21 and 22, respectively. Integrally formed at the rear side of the front projection 23 protrudes from the rear side through hole 7 of the housing main body 10 when the front projection 23 is immersed into the through hole 4 of the housing main body 10, When the front side protrusion 23 protrudes from the through hole 4 of the housing main body 10, the rear side protrusion 24 disposed to be immersed into the rear side through hole 7 of the housing main body 10. Consists of.

The rear side through hole 7 is formed by the rear surface of the housing main body 10 and the rear surface of the lid 70.

It is preferable that the elastic member 50 uses a coil spring.

In the drawing, reference numeral 8 denotes an air discharge hole for discharging air in the housing main body 10 to the outside when the elastic member 50 contracts.

Next, the operation and effects of the chair caster according to the embodiment of the present invention configured as described above will be described.

First, after screwing the screw portion (3a) of the support (3) protruding above the housing body 10 of the chair caster according to an embodiment of the present invention to the leg of the chair not shown, and then the switch member 20 In which the front side projections 23 are immersed into the through holes 4 formed in the front surface of the housing body 10, that is, the rear side projections 24 of the switch member 20 are formed in the housing body ( The lower surface of the left and right side wall portions 21 and 22 of the switch member 20 is protruded outward from the rear side through hole 7 formed by the rear surface of the back surface 10 and the rear surface of the lid 70. While contacting the upper outer peripheral surface of the shaft 30, the left and right wall portions 21 and 22 of the switch member 20 face each other to the left and right walls 1a and 1b of the housing body 10. The heights of the long holes 2a and 2b formed toward each other are generally closed by 1/2.

At this time, the shaft 30 is in contact with the lower surface of the left and right side wall portions 21 and 22 of the switch member 20 so that the shaft 30 is rotatable and the user does not show a chair. Sit in and push the indoor floor surface with the foot and the shaft 30 is rotated while the wheels 40 respectively installed on both ends of the shaft 30 is rotated clockwise or counterclockwise with the shaft 30 in a conventional chair Like this, the position of the chair can be easily changed.

Meanwhile, when the rear side protrusion 24 of the switch member 20 is pushed into the rear side through hole 7, the front side protrusion 23 of the switch member 20 is formed on the front surface of the housing main body 10. The inverted U-shaped cutting portions 21a and 22a formed in the left and right side wall portions 21 and 22 of the switch member 20 are protruded forward from the formed through-holes 4, respectively. The long holes 2a and 2b formed on the left and right side walls 1a and 1b of (10), respectively, are in a state where they coincide.

At this time, when the shaft 30 is up and down in the long holes 2a and 2b formed on the left and right walls 1a and 1b of the housing body 10, respectively, the user sits on a chair not shown. The body is brought into contact with the upper surfaces of the long holes 2a and 2b formed on the left and right walls 1a and 1b of the housing main body 10 by weight, and the through hole of the operating member 60 Since the shaft 30 penetrates 62, the shaft 30 is moved upward.

At the same time, since the operation member 60 is pushed upward while compressing the elastic means 50 as the shaft 30 is moved upward, the wheels 40 installed at both ends of the shaft 30 are upper. Going up.

Accordingly, the lower surface of the cover 70 covering the lower opening of the housing main body 10 has the same lower outer circumferential surface of the wheel 40 so that the wheels 40 installed on both ends of the shaft 30 rotate. The chair position can be kept constant.

Accordingly, the caster for chair of the present invention can move the chair while the user is sitting on the chair like a conventional rotary chair, and at the same time, the front protrusion 23 of the switch member 20 of the housing main body 10 can be moved. When the user sits in the chair in the state immersed into the through hole 4 formed in the front surface, that is, the locking state of the switch member 20, the movement of the chair can be prevented, and the structure is simple and can be used easily. In addition to reducing manufacturing costs, maintenance and repair are easy.

In the above description, the specific embodiments have been shown and described, but the present invention is not limited thereto, for example, by those skilled in the art without departing from the concept of the present invention. Of course, the design can be changed in various ways.

As described above, according to the chair caster of the present invention, the user can move the chair in a state where the user sits on the chair as in a conventional rotating chair, and when the user sits on the chair while the switch member is locked. It can prevent the movement of, the structure is simple, can be used easily, not only can reduce the manufacturing cost, but also has an excellent effect of easy maintenance and repair.

Claims (4)

Long holes 2a and 2b are formed on the left and right walls 1a and 1b in the longitudinal direction, respectively, symmetrically with each other. The cushioning force is blocked when the front protrusion 23 is inserted into the housing main body 10 having the strut 3 formed therein, and the through hole 4 formed in the front of the housing main body 10, and the rear side protrusion 23 protrudes. When the protrusions 24 protrude, the switch member 20 is controlled to have a cushion force, and the long holes 2a and 2b formed on the left and right walls 1a and 1b of the housing main body 10 and the switch member ( A shaft 30 rotatably fitted to the inverted U-shaped cutting portions 21a and 22a respectively formed on the left and right wall portions 21 and 22 of the 20, respectively, and on both ends of the shaft 30; It is fitted to a pair of wheels (40) which are respectively installed, and a circular protrusion (5) formed from the inner upper portion of the housing body 10 toward the lower portion When the front projection 23 of the switch member 20 protrudes from the through hole 4 of the housing main body 10, an elastic member 50 for elastically supporting the shaft 30, and an upper portion A concave groove 61 for accommodating the elastic member 50 is formed in the upper portion, and a through hole 62 through which the shaft 30 penetrates is formed in the lower portion of the concave groove 61 so that the elastic member ( As the contraction and expansion of the 50, the operating member 60 for supporting the shaft 30 in the upholstery (2a, 2b) of the housing main body 10 to be upward and downward, and the housing of the housing 10 The cover 70 covering the lower opening and the through-hole 71 formed in the cover 70 are screwed into the screw hole 6 formed inside the housing body 10 to be coupled to the housing body 10. Chair caster, characterized in that consisting of a fastening bolt 80 for fixing the cover 70. According to claim 1, wherein the switch member 20 is formed with the inverted U-shaped cutting portion (21a, 22a) facing each other and the left and right wall portion (21, 22) arranged in parallel at a predetermined interval and And a front side protrusion 23 integrally formed at the front side of the left and right wall portions 21 and 22 so as to be protruded into the through hole 4 of the housing main body 10, and the left and right sides. It is integrally formed at the rear side of the wall portions 21 and 22 so that when the front side protrusion 23 is immersed into the through hole 4 of the housing main body 10, the rear side through hole of the housing main body 10 ( 7 is projected from the rear side, and when the front side protrusion 23 protrudes from the through hole 4 of the housing main body 10, it is disposed to be immersed into the rear side through hole 7 of the housing main body 10. A caster for chairs, characterized by comprising side projections (24). The chair caster according to claim 2, wherein the rear side through hole (7) is formed by a rear surface of the housing main body (10) and a rear surface of the cover (70). The chair caster of claim 1, wherein the elastic member is a coil spring.

Images