초록 ▼

A chair has a seat 1 and a backrest 2 and the backrest 2 is allowed to be tilted backward by elastic deformation of right and left back frame devices 4. The right and left back frame devices 4 each are composed of two unit frames 43 and 44. The back frame device 4 has a main portion 4a which are dis

A chair has a seat 1 and a backrest 2 and the backrest 2 is allowed to be tilted backward by elastic deformation of right and left back frame devices 4. The right and left back frame devices 4 each are composed of two unit frames 43 and 44. The back frame device 4 has a main portion 4a which are disposed outside the right and left sides of the seat 1, upper inward portions 43a and 44a which are connected to an upper rear end of the main portion 4a, lower inward portions 43b and 44b which go under the seat 1 from a lower end portion of the main portion 4a, and forward end portions 43c and 44c which are integrally connected to the lower inward portions 43b and 44b. The forward end portions 43c and 44c are fixed to the base 7. The back frame device 4 can be largely elastically deformed with the combination of a characteristic in which the back frame device is long, a characteristic in which the back frame device has the lower inward portions 43b and 44b, and a characteristic in which the back frame device has the forward end portions 43c and 44c. Accordingly, the backrest 2 can be tilted backward at a large angle.

대표청구항 ▼

The invention claimed is: 1. A chair comprising:a base;a seat supported by the base;a backrest which is backwardly tiltable; andright and left back frame devices each including a main portion positioned outside right and left sides of the seat, each of the right and left back frame devices comprisin

The invention claimed is: 1. A chair comprising:a base;a seat supported by the base;a backrest which is backwardly tiltable; andright and left back frame devices each including a main portion positioned outside right and left sides of the seat, each of the right and left back frame devices comprising two unit frames formed of bars or pipes, the two unit frames having different lengths and disposed at different heights, whereinthe tilt of the backrest is supported by the back frame devices and is allowed by elastic deformation of the back frame devices; andeach of the main portions has a shape opened toward a rear end in a side view and comprises:an upper connecting portion to which the backrest is attached, positioned at an upper rear end of each of the main portions; anda lower connecting portion which goes under the seat, integrally formed with a lower rear end of each of the main portions, whereinthe lower connecting portion has an end portion extending to a front side; and