Chairs and seats – Having detachably interfitting parts or components; i.e.,... – Interfitted back and back frame
Reexamination Certificate
2003-07-03
2004-03-23
Brown, Peter R. (Department: 3636)
Chairs and seats
Having detachably interfitting parts or components; i.e.,...
Interfitted back and back frame
C403S290000
Reexamination Certificate
active
06709060
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a chair backrest. In particular, the present invention relates to a chair-backrest with improved stability, improved sitting comfort, and improved safety.
2. Description of the Related Art
FIGS. 5 and 6
of the drawings illustrate a conventional chair including a backrest
1
′, a seat
2
′, a chassis
3
′, a leg assembly
4
′, and a connecting plate
5
′.
2
he backrest
1
′ includes an engaging portion
11
′ with fixing holes
12
′ on a lower central portion thereof for connection with the connecting plate
5
′. The chassis
3
′ is fixed to a central portion of an underside of the scat
2
′ and includes a lower end for connection with the leg assembly
4
′ and an engaging portion
31
′ with fixing holes
32
′ for connection with the connecting plate
5
′. The connecting plate
5
′ is a substantially L-shaped plate including two plate sections having fixing holes
51
′ and
52
′ through which screws are extended for connecting the backrest
1
′ and the seat
2
′ in a perpendicular manner.
The backrest
1
′ is supported by the connecting plate
5
′ when the user is lying down. However, the supporting point provided by the connecting plate
5
′ is only at the lower central portion of the backrest
1
′ such that the forces exerted on the two sides of the backrest
1
′ are not uniform when center of gravity of the user's back shifts as a result of movement of the user. As a result, the connecting plate
5
′ could not provide a stable support when the user's back is not lying flat in the backrest
1
′.
SUMMARY OF THE INVENTION
An object of the present invention is to provide a chair backrest with improved stability, improved sitting comfort, and improved safety.
A chair in accordance with the present invention includes a seat, a chassis fixed to an underside of the scat, a leg assembly attached to an underside of the chassis, a backrest, and a support frame. A plurality of engaging posts are formed on a peripheral portion of a rear side of the backrest, each engaging post having a groove, each engaging post further including a transverse fixing hole. The support frame extends along the peripheral portion of the rear side of the backrest A connecting beam includes a first end fixed to a lower portion of the support frame and a second end fixed to the chassis.
A plurality of connecting blocks are provided fixing the support frame to the rear side of the backrest. Each connecting block includes a sleeve portion through which the support frame extends. Each connecting block further includes an insertion portion engaged in the groove of the respective engaging post. The sleeve portion of each connecting block includes a slit allowing expansion of the sleeve portion when the support frame is extending through said connecting block. A fastener is extended through the transverse fixing hole in the respective engaging post into the insertion portion of the respective connecting block.
Other objects, advantages, and novel features of the invention will become more apparent from the following detailed description when taken in conjunction with the accompanying drawings.
REFERENCES:
patent: 2460027 (1949-01-01), Nash
patent: 2794660 (1957-06-01), D'Azzo
patent: 4830435 (1989-05-01), Nemschoff et al.
patent: 5018789 (1991-05-01), Sheckells
patent: 5779317 (1998-07-01), Neal
patent: 6116692 (2000-09-01), Tarnay et al.
patent: 6305750 (2001-10-01), Buono et al.
patent: 6312184 (2001-11-01), Hoshino
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