KR100442536B1 - Operation levers mounting structure of swivel chair - Google Patents

Operation levers mounting structure of swivel chair Download PDF

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Publication number
KR100442536B1
KR100442536B1 KR10-2001-0052162A KR20010052162A KR100442536B1 KR 100442536 B1 KR100442536 B1 KR 100442536B1 KR 20010052162 A KR20010052162 A KR 20010052162A KR 100442536 B1 KR100442536 B1 KR 100442536B1
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KR
South Korea
Prior art keywords
gas
lever
backrest
seat plate
actuator
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KR10-2001-0052162A
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Korean (ko)
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KR20030018438A (en
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이종환
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이종환
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Priority to KR10-2001-0052162A priority Critical patent/KR100442536B1/en
Publication of KR20030018438A publication Critical patent/KR20030018438A/en
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Publication of KR100442536B1 publication Critical patent/KR100442536B1/en

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    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47C—CHAIRS; SOFAS; BEDS
    • A47C1/00—Chairs adapted for special purposes
    • A47C1/02—Reclining or easy chairs
    • A47C1/022—Reclining or easy chairs having independently-adjustable supporting parts
    • A47C1/024—Reclining or easy chairs having independently-adjustable supporting parts the parts, being the back-rest, or the back-rest and seat unit, having adjustable and lockable inclination
    • A47C1/0244—Reclining or easy chairs having independently-adjustable supporting parts the parts, being the back-rest, or the back-rest and seat unit, having adjustable and lockable inclination by fluid means
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47C—CHAIRS; SOFAS; BEDS
    • A47C1/00—Chairs adapted for special purposes
    • A47C1/02—Reclining or easy chairs
    • A47C1/022—Reclining or easy chairs having independently-adjustable supporting parts
    • A47C1/024—Reclining or easy chairs having independently-adjustable supporting parts the parts, being the back-rest, or the back-rest and seat unit, having adjustable and lockable inclination
    • A47C1/027—Reclining or easy chairs having independently-adjustable supporting parts the parts, being the back-rest, or the back-rest and seat unit, having adjustable and lockable inclination by means of clamps or friction locking members

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  • Health & Medical Sciences (AREA)
  • Dentistry (AREA)
  • General Health & Medical Sciences (AREA)
  • Chairs For Special Purposes, Such As Reclining Chairs (AREA)
  • Chairs Characterized By Structure (AREA)

Abstract

본 발명은 가스로 높낮이가 조절되며 등받이의 각도가 조절되는 회전의자의 가스작동레버와 등받이작동레버를 설치하는 구조이다. 좌판 하부의 좌판고정프레임(4)에 설치되어 가스관을 작동시킬 수 있는 가스작동레버(11)의 중간에 캠운동할 수 있는 가스작동쇠(5)를 설치하고, 가스작동레버(11)와 좌판고정프레임(4)에 설치되어 등받이고정프레임(20)의 회전 구속을 해제할 수 있는 등받이작동레버(24)의 중간에 캠운동할 수 있는 잠금장치 작동쇠(7)를 설치하며, 좌판고정프레임(4) 내에는 가스작동쇠(5)와 잠금장치 작동쇠(7)의 회전 각도를 제한하면서 축방향으로의 유동을 방지하는 홈(15a,15b)이 각각 형성된 하나의 고정편(6)을 설치한 것이다. 유동을 방지하면서 부품수 및 고정의 감소를 기할 수 있다.The present invention is a structure that installs the gas operating lever and the back operation lever of the rotating chair that the height is adjusted to the gas and the angle of the backrest is adjusted. A gas actuating lever (5) for cam movement is installed in the middle of the gas actuating lever (11) installed in the seat fixing frame (4) below the seat plate to operate the gas pipe, and the gas actuating lever (11) and the seat plate are installed. It is installed on the fixed frame (4) is installed in the middle of the backrest operating lever 24 that can release the rotation restraint of the backrest fixed frame 20 to install the locking device actuator (7) for cam movement, seat plate fixed frame In (4), one fixing piece 6 having grooves 15a and 15b formed therein for preventing the flow in the axial direction while restricting the rotation angles of the gas actuator 5 and the locking mechanism actuator 7 is provided. It is installed. It is possible to reduce the number of parts and fixation while preventing the flow.

Description

회전의자의 작동레버 설치구조{OPERATION LEVERS MOUNTING STRUCTURE OF SWIVEL CHAIR}Operation lever installation structure of swivel chair {OPERATION LEVERS MOUNTING STRUCTURE OF SWIVEL CHAIR}

본 발명은 가스로 높낮이가 조절되며 등받이의 각도가 조절되는 회전의자의 가스작동레버와 등받이작동레버를 설치하는 구조에 관한 것이다.The present invention relates to a structure for installing the gas operation lever and the back operation lever of the rotating chair, the height of which is adjusted by the gas and the angle of the backrest is adjusted.

회전의자에서 높낮이 조절은 가스관을 가스작동레버로 눌러주면서 의자의 높이를 맞춘 후 가스작동레버를 원위치시키면 된다. 가스작동레버를 누른다는 것은 가스관의 스핀들 상단에 돌출한 누름부를 누르는 것을 말한다. 가스관은 튜브와 스핀들로 구성되어 있는데 튜브는 다리쪽에 고정되어 있고, 이 튜브에 끼워져 운동하는 스핀들은 좌판 밑의 좌판고정프레임에 고정되어 있다. 회전의자의 등받이 각도 조절은 등받이작동레버를 회전시키면서 등받이에 힘을 가하면 등받이가 그 하중만큼 뒤로 젖혀졌다가 하중이 감소하면 그만큼 복귀하는 것을 의미한다. 등받이작동레버는 좌판 밑의 좌판고정프레임에 고정되어 있다. 좌판고정프레임에 설치된 등받이작동레버의 선단은 연장되어 그 연장된 끝의 핀은 등받이를 고정시키는 등받이고정프레임의 구멍에 끼워져 등받이가 뒤로 젖혀지지 못하도록 규제한다. 그래서 등받이작동레버를 눌러 등받이고정프레임의 구멍에 꽂힌 핀을 빼면 좌판에 앉은 사람이 등에 힘을 실어 등받이를 뒤로 밀 수 있는 것이다.To adjust the height of the swivel chair, press the gas pipe with the gas operated lever, adjust the height of the chair, and then return the gas operated lever to its original position. Depressing the gas actuating lever means depressing the protruding press on the top of the spindle of the gas pipe. The gas pipe is composed of a tube and a spindle. The tube is fixed to the leg side, and the spindle moving in the tube is fixed to the seat plate fixing frame under the seat. Adjusting the backrest angle of the swivel chair means that when the backrest lever is rotated and a force is applied to the backrest, the backrest leans back by that load and then returns when the load decreases. The back support lever is fixed to the seat fixing frame under the seat. The tip of the back support lever installed on the seat plate fixing frame is extended so that the pins of the extended end are backrests for fixing the backrest and are inserted into the holes of the fixed frame to prevent the backrest from being rolled back. So, by pressing the back operation lever and removing the pin inserted in the hole of the fixed frame, the person sitting on the seat can push the back back with the power on his back.

그러나 위와 같은 회전의자에서는 가스작동레버와 등받이작동레버가 공히 좌판공정프레임의 중앙쪽에서 좌우로 각각 손잡이가 뻗치도록 설치되어 있는데, 이 각각의 레버가 별도의 회전각도 제어수단에 의하여 일정 각도만 회전할 수 있도록 하고 있고, 축방향으로의 유동도 레버축에 각각 끼워진 복수개의 스냅링에 의하여 규제되도록 하고 있다. 이렇게 하다 보니 가스작동레버와 등받이작동레버가 특히 축방향으로 유격이 발생하여 품질저하의 원인이 되고 있었고, 부품수도 상대적으로 증가해 제조 공수나 원가의 상승 원인이 되기도 하였던 것이다.However, in the above swivel chair, both the gas actuating lever and the backrest actuating lever are installed so that the handles extend from the center side of the seat frame to the left and right, respectively, and each lever can rotate only a certain angle by a separate rotation angle control means. The flow in the axial direction is also regulated by a plurality of snap rings respectively fitted to the lever shaft. As a result, gas-operated levers and back-restored levers caused deterioration in the axial direction, in particular, causing quality deterioration.

본 발명의 목적은 가스작동레버와 등받이작동레버의 회전각도 제어와 축방향으로의 유동방지를 하나의 수단에 의하여 달성되도록 함으로써 품질향상을 기하고 부품수 감소 등에 따른 제조 공수와 원가의 절감을 기할 수 있는 설치구조를 제시하는데 있는 것이다.An object of the present invention is to improve the quality by reducing the rotational angle control of the gas operating lever and the backrest operating lever and to prevent the flow in the axial direction by one means to reduce the number of manufacturing and the cost of manufacturing due to the number of parts, etc. It is to present a possible installation structure.

도 1은 본 발명의 적용부위를 예시한 회전의자의 단면구성도.1 is a cross-sectional view of a swivel chair illustrating the application of the present invention.

도 2는 본 발명의 실시예의 작동레버 설치부 확대사시도.Figure 2 is an enlarged perspective view of the operating lever installation portion of the embodiment of the present invention.

도 3은 도 2의 A-A선 확대단면도.3 is an enlarged cross-sectional view taken along the line A-A of FIG.

도 4는 도 2의 B-B선 확대단면도.4 is an enlarged cross-sectional view taken along the line B-B of FIG.

<도면의 주요 부분에 대한 부호의 설명><Explanation of symbols for the main parts of the drawings>

1:가스관, 3:스핀들, 4:좌판고정프레임, 5:가스작동쇠, 6:고정편, 7:잠금장치 작동쇠, 8,13:레버, 10,10',23:손잡이, 11:가스작동레버, 12:좌판, 15a,15b:홈, 16:연결봉, 17:잠금핀, 18:등받이압력조절쇠, 19:등받이, 20:등받이고정프레임, 21:힌지, 24:등받이작동레버1: gas pipe, 3: spindle, 4: seat fixing frame, 5: gas clamp, 6: fixing piece, 7: lock mechanism, 8, 13: lever, 10, 10 ', 23: handle, 11: gas Operating lever, 12: seat, 15a, 15b: groove, 16: connecting rod, 17: locking pin, 18: back pressure regulator, 19: backrest, 20: backrest fixing frame, 21: hinge, 24: backrest operating lever

본 발명은 상기 목적을 달성하기 위하여, 좌판 하부의 좌판고정프레임에 설치되어 가스관을 작동시킬 수 있는 가스작동레버와 상기 좌판고정프레임에 설치되어 등받이고정프레임의 회전 구속을 해제할 수 있는 등받이작동레버를 갖는 회전의자에 있어서, 상기 가스작동레버의 중간에 가스작동레버의 회전에 따라 캠운동할 수 있는 가스작동쇠를 설치하고, 상기 등받이작동레버의 중간에 등받이작동레버의 회전에 따라 캠운동할 수 있는 잠금장치 작동쇠를 설치하며, 상기 좌판고정프레임 내에는 상기 가스작동쇠와 상기 잠금장치 작동쇠의 회전 각도를 제한하면서 축방향으로의 유동을 방지하는 홈이 각각 형성된 하나의 고정편을 설치한 것이다.In order to achieve the above object, the present invention provides a gas actuating lever installed on the seat plate fixing frame below the seat plate to operate a gas pipe and a backrest operating lever installed on the seat plate fixing frame to release the rotational constraint of the backrest fixing frame. In the rotary chair having a gas actuating lever is installed in the middle of the gas operating lever in accordance with the rotation of the gas operating lever, and the cam movement in accordance with the rotation of the back operation lever in the middle of the back operation lever A locking device locking device is provided, and a fixing piece is formed in the seat plate fixing frame, each of which has grooves for preventing the flow in the axial direction while restricting rotation angles of the gas locking device and the locking device locking device. It is.

본 발명은 상기와 같은 구성에 따라, 가스작동레버를 작동시키면 가스작동쇠가 회전하여 가스관을 작동시키므로 의자의 높낮이를 조절할 수 있고, 등받이작동레버를 작동시키면 잠금장치 작동쇠가 회전하여 등받이고정프레임이 해제됨으로서 등받이를 뒤로 젖힐 수 있다. 이러한 작동시에 가스작동쇠와 잠금장치 작동쇠는 고정편에 의하여 회전 각도가 제한되며 좌우 유동도 방지된다.The present invention according to the configuration as described above, when operating the gas actuating lever to operate the gas pipe to operate the gas pipe can adjust the height of the chair, the actuation of the backrest lever to lock the locking device actuator to rotate the backrest fixed frame This release allows the backrest to tilt back. In this operation, the gas actuator and the lock actuator are limited in rotation angle by the fixing piece and the left and right flows are also prevented.

이하, 본 발명의 실시예를 첨부된 도면에 의하여 설명한다.Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

도 1은 본 발명의 적용부위를 예시한 회전의자의 단면구성도이고, 도 2는 작동레버 설치부를 확대한 사시도이다. 또, 도 3은 도 2의 A-A선 확대단면도이고, 도 4는 도 2의 B-B선 확대단면도이다.1 is a cross-sectional view of a swivel chair illustrating the application of the present invention, Figure 2 is an enlarged perspective view of the operating lever mounting portion. 3 is an enlarged cross-sectional view taken along the line A-A of FIG. 2, and FIG. 4 is an enlarged cross-sectional view taken along the line B-B of FIG.

먼저, 본 발명이 적용되는 부위는 도 1에서 보는 바와 같이 가스관(1)의 튜브(2)에 끼워진 스핀들(3)에 좌판고정프레임(4)이 고정되어 있는 부위이다. 도 1에서는 스핀들(3) 위에서 캠운동하는 가스작동쇠(5)가 도시되어 있고, 고정편(6)을 사이에 두고 가스작동쇠(5)의 반대편에 잠금장치 작동쇠(7)가 설치되어 있다.First, the site to which the present invention is applied is a site in which the seat plate fixing frame 4 is fixed to the spindle 3 fitted to the tube 2 of the gas pipe 1 as shown in FIG. 1. In FIG. 1, the gas actuator 5 is cam-moved on the spindle 3, and the locking mechanism 7 is installed on the opposite side of the gas actuator 5 with the fixing piece 6 interposed therebetween. have.

가스작동쇠(5)는 도 2 및 도 3에서 보는 바와 같이 중앙의 원통형 보스에 레버(8)가 끼워져 볼트(9)로 체결되고 한쪽은 고정편(6)의 홈(15a)에 끼워져 있으며 다른 쪽은 스핀들(3) 위에 면접촉하고 있다. 레버(8)는 헛돌지 않도록 하기 위해 다각형의 봉으로 구성할 수 있는 바 실시예에서는 육각형의 봉으로 하였다. 레버(8)의 양쪽은 좌판고정프레임(4)에 회전 가능하게 끼워져 있는데 레버(8)의 한쪽에는 손으로 잡고 일방향으로 회전시킬 수 있는 손잡이(10)가 설치되어 있다. 가스작동레버(11)를 일방향으로 회전시키면(누르면) 가스작동쇠(5)가 회전하면서 스핀들(3)을 눌러줌으로써 좌판(12)의 높낮이를 조절할 수 있게 된다.As shown in Figs. 2 and 3, the gas actuator 5 is fitted with a bolt 9 by a lever 8 fitted to a central cylindrical boss, and one end is fitted into a groove 15a of the fixing piece 6 and the other. The side is in surface contact with the spindle 3. The lever 8 is a hexagonal rod in the embodiment, which can be constituted by a polygonal rod so as not to drift away. Both sides of the lever 8 are rotatably fitted to the seat plate fixing frame 4, and one side of the lever 8 is provided with a handle 10 which can be held by a hand and rotated in one direction. When the gas actuating lever 11 is rotated in one direction (by pressing), the height of the seat plate 12 can be adjusted by pressing the spindle 3 while the gas actuating knob 5 rotates.

잠금장치 작동쇠(7)는 도 2 및 도 4에서 보는 바와 같이 중앙의 원통형 보스에 레버(13)가 끼워져 볼트(14)로 체결되고 한쪽은 고정편(6)의 홈(15b)에 끼워져 있다. 레버(13)는 헛돌지 않도록 하기 위해 다각형의 봉으로 구성할 수 있는 바 실시예에서는 육각형의 봉으로 하였다. 레버(13)의 양쪽은 좌판고정프레임(4)에 회전 가능하게 끼워져 있는데 레버(13)의 한쪽에는 손으로 잡고 일방향으로 회전시킬 수 있는 손잡이(10')가 설치되어 잠금장치 작동쇠(7)와 함께 하나의 등받이작동레버(24)를 이루고 있다. 잠금장치 작동쇠(7)의 하부에는 고정편(6)의 밑으로 지나가는 연결봉(16)이 연결되어 있으며 이 연결봉(16)의 끝에는 잠금핀(17)이 연결되어 있다. 잠금핀(17)은 좌판고정프레임(4)의 후방을 통과하여 등받이압력조절쇠(18)의 후방 하부에 끼워지도록 설치되어 있다. 등받이압력조절쇠(18)는 등받이(19)가 부착되는 등받이고정프레임(20)의 하부에 고정되어 있으며 좌판고정프레임(4)에 힌지(21)로 결합되어 있고 스프링(22)의 탄력을 손잡이(23)로 조절함으로써 등받이(19)가 뒤로 젖혀지는 압력을 조절할 수 있게 된다.As shown in Figs. 2 and 4, the locking device clamp 7 is fitted with a bolt 13 by a lever 13 fitted to a central cylindrical boss, and one end is fitted into a groove 15b of the fixing piece 6. . The lever 13 is a hexagonal rod in the embodiment, which can be constituted by a polygonal rod so as not to drift away. Both sides of the lever 13 are rotatably fitted to the seat plate fixing frame 4, and one side of the lever 13 is provided with a handle 10 ', which can be held by a hand and rotated in one direction, so that the locking device actuating mechanism 7 Together with the backrest operation lever 24 is achieved. A connecting rod 16 passing under the fixing piece 6 is connected to the lower portion of the locking device clamp 7, and a locking pin 17 is connected to the end of the connecting rod 16. The locking pin 17 is installed to pass through the rear of the seat plate fixing frame 4 so as to be fitted to the rear lower portion of the backrest pressure adjuster 18. The backrest pressure adjuster 18 is fixed to the lower part of the backrest fixing frame 20 to which the backrest 19 is attached, and is coupled to the seat plate fixing frame 4 by a hinge 21 and handles the elasticity of the spring 22. By adjusting to 23, the pressure at which the backrest 19 is tilted back can be adjusted.

고정편(6)은 한쪽이 짧고 다른 쪽이 긴 디귿자형 단면으로 구성된다. 이 고정편(6)은 좌판(12) 아래에서 좌판(12)을 유동 가능하게 고정시키며 디귿자형 단면을 갖는 좌판고정프레임(4) 중앙 내부에서 좌판고정프레임(4)과 교차되는 방향으로 설치되어 있다. 고정편(6)에는 위에서 언급한 대로 가스작동쇠(5)가 끼워지는 홈(15a)과 잠금장치 작동쇠(7)가 끼워지는 홈(15b)이 형성되어 있다. 그래서 가스작동쇠(5)를 회전시키게 되면 가스작동쇠(5)가 일정 각도 회전하였다가 고정편(6)의 홈(15a)에 걸려 더 이상 회전하지 못하게 되며, 잠금장치 작동쇠(7)도 가스작동쇠(5)와 마찬가지로 회전시키게 되면 일정 각도 회전하였다가 고정편(6)의 홈(15b)에 걸려 더 이상 회전하지 못하게 된다.The stationary piece 6 is comprised by the diagonal cross section which is short in one side and long in the other. The fixing piece 6 is installed in a direction intersecting with the seat plate fixing frame 4 inside the center of the seat plate fixing frame 4 having a depression-shaped cross section to securely seat the seat plate 12 under the seat plate 12. have. The fixing piece 6 is formed with a groove 15a into which the gas actuator 5 is fitted and a groove 15b into which the lock actuator 7 is fitted, as mentioned above. Therefore, when the gas actuator 5 is rotated, the gas actuator 5 rotates at an angle and is caught in the groove 15a of the fixing piece 6 so that it can no longer be rotated. When the gas operated key 5 is rotated, it rotates at an angle, and is caught in the groove 15b of the fixing piece 6 so that it can no longer be rotated.

이와 같이 구성된 본 발명은 가스작동레버와 등받이작동레버의 회전각도 제어와 축방향으로의 유동방지를 스냅링 등의 독립된 유니트로서의 설치구조를 피하면서 하나의 고정편에 의하여 설치되도록 함으로써 불필요한 유동이 없어지면서 구조가 간단해져서 품질향상을 기하게 되며 부품수 감소 등에 따른 제조 공수와 제조 원가의 절감을 기할 수 있다.The present invention configured as described above allows the control of the rotation angle of the gas actuating lever and the backrest actuating lever and the prevention of flow in the axial direction by being installed by one fixing piece while avoiding the installation structure as an independent unit such as a snap ring while eliminating unnecessary flow. The structure is simplified, so that quality can be improved, and manufacturing cost and manufacturing cost can be reduced by reducing the number of parts.

Claims (2)

좌판 하부의 좌판고정프레임에 설치되어 가스관을 작동시킬 수 있는 가스작동레버와 상기 좌판고정프레임에 설치되어 등받이고정프레임의 회전 구속을 해제할 수 있는 등받이작동레버를 갖는 회전의자에 있어서,In the rotary chair having a gas operation lever is installed on the lower plate fixed frame of the lower plate to operate the gas pipe and the back operation lever is installed on the seat plate fixed frame to release the rotation restraint of the back frame, 상기 가스작동레버의 중간에 가스작동레버의 회전에 따라 캠운동할 수 있는 가스작동쇠를 설치하고, 상기 등받이작동레버의 중간에 등받이작동레버의 회전에 따라 캠운동할 수 있는 잠금장치 작동쇠를 설치하며, 상기 좌판고정프레임 내에는 상기 가스작동쇠와 상기 잠금장치 작동쇠의 회전 각도를 제한하면서 축방향으로의 유동을 방지하는 홈이 각각 형성된 하나의 고정편을 설치한 것을 특징으로 하는 회전의자의 작동레버 설치구조.Install a gas actuator for cam movement in accordance with the rotation of the gas operating lever in the middle of the gas actuating lever, and a locking device actuator for cam movement in accordance with the rotation of the backrest operating lever in the middle of the back actuating lever. Rotating chairs are provided in the seat plate fixing frame is provided with one fixing piece each formed with grooves for preventing the flow in the axial direction while limiting the rotation angle of the gas actuator and the locking device actuator. Operating lever mounting structure. 제1항에 있어서,The method of claim 1, 상기 가스작동레버와 상기 등받이작동레버는 각각 다각형의 봉으로 구성한 것을 특징으로 하는 회전의자의 작동레버 설치구조.And the gas actuating lever and the backrest actuating lever are structured by polygonal rods, respectively.
KR10-2001-0052162A 2001-08-28 2001-08-28 Operation levers mounting structure of swivel chair KR100442536B1 (en)

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KR100678653B1 (en) * 2005-05-16 2007-02-05 기 석 우 Multifunctional chair
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EP0521762A1 (en) * 1991-07-01 1993-01-07 Airax Column destined for a support which is equipped with a gas spring
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EP0169418A2 (en) * 1984-07-23 1986-01-29 SOL. ID S.r.l. Improved mechanism for selecting the vertical positioning of load-bearing furniture components
EP0362038A1 (en) * 1988-09-30 1990-04-04 Airaxs.A. Control device for a blockable gas spring
EP0366128A1 (en) * 1988-10-26 1990-05-02 Stabilus GmbH A length variable and lockable positioning device
EP0521762A1 (en) * 1991-07-01 1993-01-07 Airax Column destined for a support which is equipped with a gas spring
JPH0541449U (en) * 1991-11-13 1993-06-08 株式会社イトーキクレビオ Bellows mounting structure for the chair support
KR930017656U (en) * 1992-01-28 1993-08-20 유창근 Height adjustment device for swivel chair
KR970007966U (en) * 1995-08-28 1997-03-27 이강종 Link mechanism for chairs with backrest adjustment
EP0806165A2 (en) * 1996-05-09 1997-11-12 Haworth, Inc. Forward-rearward tilt control for chair
JP2000346116A (en) * 1999-03-26 2000-12-12 Takano Co Ltd Gas spring and stool utilizing the same
KR200243560Y1 (en) * 2001-04-16 2001-10-11 동성사무기기(주) Gas control type base for a chair which is adjusted angle of back of a chair

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