Chairs and seats – Bottom or back with means to alter contour – Providing support for lower back region
Reexamination Certificate
2002-12-14
2004-02-24
Cranmer, Laurie K. (Department: 3636)
Chairs and seats
Bottom or back with means to alter contour
Providing support for lower back region
C297S450100, C297S451100
Reexamination Certificate
active
06695403
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a backrest supporting assembly that provides improved supporting stability and improved seating 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 substantially L-shaped connecting plate
5
′. The backrest
1
′ includes a connecting portion
11
′ in an intermediate portion of a lower end of a rear face thereof, the connecting portion
11
′ having fixing holes
12
′ for connection with an arm of the L-shaped connecting plate
5
′ that has fixing holes
51
′. The chassis
3
′ is fixed to an underside of the seat
2
′ and has a lower end for connection with the leg assembly
4
′. Further, the chassis
3
′ includes a connecting portion
31
′ at a rear end thereof, the connecting portion
31
′ having fixing holes
32
′ for connection with the other arm of the L-shaped connecting plate
5
′ that has fixing holes
52
′.
In use, a person sitting in the seat
2
′ and lying his or her back on the backrest
1
′ imparts a load to the backrest
1
′ which is supported by the connecting plate
5
′. The supporting point is located in a central position of the lower portion of the backrest
1
′. Two sides of the backrest
1
′ are subject to unequal forces if the center of gravity of the person is offset from the central vertical axis of the backrest
1
′. Thus, the connecting plate
5
′ could not provide reliable support to the backrest
1
′.
SUMMARY OF THE INVENTION
An object of the present invention is to provide backrest supporting assembly that provides improved supporting stability and improved seating safety.
A chair in accordance with the present invention comprises a seat, a backrest mounted to the seat, the backrest including a rear face having two sides, a chassis fixed to an underside of the seat, a leg assembly attached to the chassis, two stays respectively attached to the sides of the rear face of the backrest, and a connecting frame. Each stay has an upper end fixed to an associated side of the rear face of the backrest. The connecting frame has two ends and an extension extending from the connecting frame. The extension is securely connected to a rear end of the chassis. Each end of the connecting frame is fixed to a lower end of an associated stay.
Two connecting plates are respectively fixed to the sides of the rear face of the backrest. Each connecting plate is securely connected to the upper end of an associated stay. A waist is securely connected between the connecting plates.
Each connecting plate includes a guide slot. The waist includes two ends each having a peg with a fixing hole, the peg being extended through the guide slot. A pressing block is attached to each peg and has a fixing hole in a first end thereof and an engaging groove in a second end thereof, the engaging groove of the pressing block being aligned with the fixing hole of the pressing block. Each peg is received in the engaging groove of an associated pressing block, with a fastener being extended through the fixing hole of the pressing block and the fixing hole of the peg.
REFERENCES:
patent: 2832397 (1958-04-01), Premo
patent: 3947068 (1976-03-01), Buhk
patent: 6471294 (2002-10-01), Dammermann et al.
patent: 6572190 (2003-06-01), Koepke et al.
Baxley Charles E.
Cranmer Laurie K.
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