Chair

Patent metadata

Field	Value
Publication number	US-10362876-B2
Application number	US-201615772725-A
Country	US
Kind code	B2
Filing date	Nov 4, 2016
Priority date	Nov 6, 2015
Publication date	Jul 30, 2019
Grant date	Jul 30, 2019

Abstract

A chair ( 1 ) includes an installation base ( 10 ), a leg column ( 11 ) supported by the installation base ( 10 ) in a tiltable manner, a seat body ( 12 ) supported on an upper part of the leg column ( 11 ), an elastic member ( 19 ) which urges the leg column ( 11 ) to an initial tilted posture, and a coming-off restriction member ( 22 ) which restricts coming-off of the leg column ( 11 ) from the installation base ( 10 ). On a support wall ( 16 ) of the installation base ( 10 ) having an insertion hole ( 20 ) through which part of the coming-off restriction member ( 22 ) is inserted, a slide guide ( 21 ) coming into slidable contact with a slide guide ( 21 ) at a peripheral edge portion of a lower surface side of the insertion hole ( 20 ) is provided. The coming-off restriction member ( 22 ) has an upwardly protruding spherical guide surface ( 23 ) which is slidably brought into contact with the slide guide ( 21 ) below the insertion hole ( 20 ).

First claim

The invention claimed is:

1. A chair comprising:
an installation base which is mounted on or fixed to an installation surface and includes a tilting allowance hole;
a leg column which stands upward from the installation base and is supported by the installation base in a tiltable manner;
a seat body which is supported on an upper part of the leg column to receive a seating load of an occupant;
an elastic member which is interposed between the leg column and the installation base and urges the leg column to take a vertical posture which is an initial tilted posture;
a support wall which supports the elastic member on the installation base and has an insertion hole; and
a coming-off restriction portion which penetrates the support wall from below to restrict coming-off of the leg column from the installation base,
wherein, in the support wall of the installation base, part of the coming-off restriction portion is inserted through the insertion hole, and a slide guide coming into slidable contact with a lower surface of a peripheral edge portion of the insertion hole of the coming-off restriction portion is provided, and
the coming-off restriction portion has a spherical guide surface which upwardly protrudes and comes into slidable contact with the slide guide below the insertion hole.

2. The chair according to claim 1 , wherein the elastic member is sandwiched and fixed in a compressed state between the leg column and the support wall of the installation base.

3. The chair according to claim 2 , wherein an abutting portion of the slide guide coming into contact with the guide surface of the coming-off restriction portion is a protruding curved surface.

4. The chair according to claim 3 , wherein the abutting portion of the slide guide coming into contact with the guide surface of the coming-off restriction portion is formed in an annular shape along a circumferential region of the insertion hole.

5. The chair according to claim 3 , wherein the support wall and the slide guide of the installation base are formed of separate members.

6. The chair according to claim 3 , wherein the leg column has an abutting wall which protrudes outward in a radial direction from a main body portion of the leg column and comes into contact with an upper surface of the elastic member.

7. The chair according to claim 3 , wherein:
the coming-off restriction portion is formed of a component different from a member of a main body portion of the leg column; and
in a state in which the elastic member is sandwiched between the member of the main body portion and the support wall of the installation base, the coming-off restriction portion is fastened and fixed to the member of the main body portion together with the support wall, and a spacer member which restricts displacement of the coming-off restriction portion with respect to the member of the main body portion in approaching and separating directions is provided.

8. The chair according to claim 1 , wherein an abutting portion of the slide guide coming into contact with the guide surface of the coming-off restriction portion is a protruding curved surface.

9. The chair according to claim 8 , wherein the abutting portion of the slide guide coming into contact with the guide surface of the coming-off restriction portion is formed in an annular shape along a circumferential region of the insertion hole.

10. The chair according to claim 8 , wherein the support wall and the slide guide of the installation base are formed by separate members.

11. The chair according to claim 1 , wherein the leg column has an abutting wall which protrudes outward in a radial direction from a main body portion of the leg column and comes into contact with an upper surface of the elastic member.

12. The chair according to claim 1 , wherein:
the coming-off restriction portion is formed of a component different from a member of a main body portion of the leg column; and
in a state in which the elastic member is sandwiched between the member of the main body portion and the support wall of the installation base, the coming-off restriction portion is fastened and fixed to the member of the main body portion together with the support wall, and a spacer member which restricts displacement of the coming-off restriction portion with respect to the member of the main body portion in approaching and separating directions is provided.

13. The chair according to claim 1 , wherein the leg column has an abutting wall which presses an upper surface of the elastic member, the tilting allowance hole of the installation base is disposed above the abutting wall of the leg column, the leg column is tiltably inserted into the tilting allowance hole, a cover member which is tiltably and integrally engaged with the leg column and closes the tilting allowance hole from below is disposed above the abutting wall, and downward displacement of the cover member is restricted by the leg column in a state in which the cover member is not fixed to the leg column.

14. The chair according to claim 1 , wherein the downward displacement of the cover member is restricted by the abutting wall in a state in which the cover member is not fixed to the abutting wall.

Assignees

• Okamura Corp

Inventors

• Aono Keisuke
• Ono Naho

Classifications

• A47C3/30

  with vertically-acting fluid cylinder · CPC title

• A47C7/14

  of adjustable shape; elastically mounted {; adaptable to a user contour or ergonomic seating positions (movably-coupled seat and backrests with elastic adjustment means A47C1/03261)} · CPC title

• A47C7/004

  for chairs or stools with central column, e.g. office chairs · CPC title

• A47C9/002 Primary

  with exercising means or having special therapeutic or ergonomic effects · CPC title

• A47C3/026 Primary

  with a central column, e.g. rocking office chairs; Tilting chairs · CPC title