Chairs and seats – Bottom or back with means to alter contour – Providing support for lower back region
Reexamination Certificate
2007-12-04
2007-12-04
Brown, Peter R. (Department: 3636)
Chairs and seats
Bottom or back with means to alter contour
Providing support for lower back region
C297S284700, C297S408000, C297S410000, C297S405000
Reexamination Certificate
active
11634850
ABSTRACT:
A backrest adjusting device for office chairs comprising: a seat portion having a seat cushion and a stand for supporting the seat cushion; a back having a frame, a back cushion fixed on the surface of the frame, a connecting member for connecting the bottom of the back to a rear side of the seat portion, a hollow containing space formed at the middle section of the back, an n-shaped member being disposed in the containing space and extended backward; and a first attaching device installed on the n-shaped member of the containing space, thereby achieving the adjustment of the three-dimensional space of position, longitudinal buffer and angular rotation. Moreover, the back further includes a support member disposed at the top of the back, and a second attaching device installed on the support member and having a structure identical to the first attaching device. Meanwhile, the first attaching device has an attaching body made in compliance with the shape of a human waist to form a backrest bump. Furthermore, the second attaching device has an attaching body made in compliance with the shape of a human head to form a headrest. In this way, the three-dimensional space such as position, height, longitudinal buffer and angular rotation of a backrest or a headrest is adjustable.
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