Chair

Abstract

The present claimed invention intends to provide a chair having a frame structure that is effective for securing a required strength without needless structure to reinforce the strength.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a perspective view showing a chair in accordance with one embodiment of this invention.

FIG. 2 is a front view thereof.

FIG. 3 is a left side view thereof.

FIG. 4 is a longitudinal cross-sectional view thereof.

FIG. 5 is a perspective view showing an internal structure of a diameter expanding base part in accordance with this embodiment.

FIG. 6 is a plain view of the chair in accordance with this embodiment in a state that a mesh member is omitted to show and an upper end cover of a leg support post is removed.

FIG. 7 is a bottom view of the chair in accordance with this embodiment.

FIG. 8 is an exploded view of FIG. 4.

FIG. 9 is an exploded perspective view of the chair in accordance with this embodiment.

FIG. 10 is a cross-sectional view showing a state that the mesh member is fitted into an opening of the back frame.

FIG. 11 is a cross-sectional view showing a state that the mesh member is fitted into an opening of the seat frame.

FIG. 12 is a plain view of the chair in accordance with this embodiment.

FIG. 13 is a view showing a modified form of this invention.

Claims

1. A chair wherein a chair body comprises a seat frame, a back frame and a rib that reinforces between the seat frame and the back frame,the rib is formed to extend to a side direction so as to be used as an arm frame,the seat frame, the back frame and the arm frame are continuously and integrally formed three-dimensionally, and a single opening into which another member to form a seating face is fitted is arranged at a portion ranging from the seat frame to the back frame.

2. A chair wherein a chair body comprises a seat frame, a back frame and a rib that reinforces between the seat frame and the back frame, the rib is formed to extend to a side direction so as to be used as an arm frame,the seat frame, the back frame and the arm frame are continuously and integrally formed three-dimensionally, and an opening into which another member to form a seating face is fitted is arranged at the seat frame and the back frame respectively.

3. A chair wherein a width of a valid supporting part locating above a lumbar corresponding part of a back frame is generally the same as a width of a seat frame, a hip corresponding part locating below the lumbar corresponding part of the back frame is gradually narrowed along downward, and a width of a boundary part between a back and a seat is set to be smaller than a width of the valid supporting part of the back frame and a width of the seat frame, a rear end of an arm frame is formed to extend to a front side direction from the back frame, a front end of the arm frame is formed to extend to an upper side direction from the seat frame and whole of the arm frame, the seat frame and the back frame is integrally made of resin, and then a peripheral border of an opening formed by the arm frame, the seat frame and the back frame is curved not two-dimensionally but three-dimensionally.

4. The chair described in any one of claim 1, claim 2 or claim 3, wherein a boundary part between a seat and a back is of a shape of U-character whose opening faces forward in a longitudinal sectional view, and its longitudinal sectional view forms a continuous three-dimensional shape with curving gently along a hip in a plain view.

5. The chair described in any one of claim 1, claim 2 or claim 3, wherein a front hanging part is arranged at a front end of a seat, the front hanging part is of a reverse L-character in a longitudinal sectional view, and its longitudinal sectional view forms a continuous three-dimensional shape with gently curving along a front edge of the seat.

6. The chair described in any one of claim 1, claim 2 or claim 3, wherein a horizontal part is continuously arranged in a smoothly folded manner at an upper end of the arm frame.

7. The chair described in any one of claim 1, claim 2or claim 3, wherein the arm frame has such a configuration that an end thereof is continuous to an end of the seat frame and extends to a side direction from the seat frame and then smoothly rises upward.

8. The chair described in any one of claim 1, claim 2 or claim 3, wherein the arm frame has such a configuration that an end thereof is continuous to an end of the back frame and extends to a front side direction from the back frame with forming a smooth curve.

9. The chair described in any one of claim 1, claim 2 or claim 3, wherein one end of the arm frame is connected to the back frame at a height generally the same as a height of a lumbar corresponding part most protruding forward among a back rest supporting face.

10. The chair described in any none of claim 1, claim 2 or claim 3, wherein the another member comprises a mesh member, a supporting face having a curved surface that supports the mesh member is arranged at an edge of the opening, and when the mesh member receives a load the curved surface supports the load through the mesh member with the mesh member smoothly bowing along the curved surface.

11. The chair described in any one of claim 1, claim 2 or claim 3, wherein corner portions of the seat frame are rotatably supported by a leg support post through the multiple seat support frames that extend radially.