Chairs and seats – Movable back – Tiltable
Reexamination Certificate
2002-08-22
2004-02-10
Nelson, Jr., Milton (Department: 3636)
Chairs and seats
Movable back
Tiltable
C297S376000, C297S354130
Reexamination Certificate
active
06688694
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a releasable safety device for a chair backrest. In particular, the present invention relates to a safety device that limits an inclination angle of a chair backrest, wherein the safety device can be released for transport purpose.
2. Description of the Related Art
FIG. 1
of the drawings illustrates a seat frame
10
and a backrest frame
11
for a chair of a conventional design. The seat frame
10
and the backrest frame
11
are connected together by hinges
12
. Further, a stepless pneumatic positioning cylinder
13
is provided for actuating the backrest frame
11
to a desired inclined position relative to the seat frame
10
under control of a control rod
14
. At least one extension
15
extends from the backrest frame
11
for limiting the inclination angle of the backrest frame
11
to be about 125 degrees, as indicated by the phantom lines in FIG.
1
. This avoids falling of the user resulting from over inclination of the backrest
11
. However, this safety design results in an inconvenience to transport. In particular, the leg assembly of the chair is detached from the seat for transport, but the backrest frame
11
could not be moved to a position aligned with the seat frame
10
, thereby occupying a considerable space that incurs additional cost for transport.
SUMMARY OF THE INVENTION
An object of the present invention is to provide a safety device that limits an inclination angle of a chair backrest, wherein the safety device can be released for transport purpose.
A chair in accordance with the present invention comprises a seat frame and a backrest frame. A first connecting member is provided on each of two lateral sides of the seat frame. A second connecting member is provided on each of two lateral sides of the backrest frame. Each second connecting member is pivotally connected with an associated first connecting member. The inclination angle of the backrest frame relative to said seat frame is adjustable. A safety device includes a frame fixed to one of the second connecting member and a pin extending through the frame and including an end located on a path of the associated first connecting member, thereby restraining a maximum inclination angle of the backrest frame relative to the seat frame. The safety pin is movable away from the path of the associated first connecting member, allowing the backrest frame to be moved to a position aligned with the seat frame.
REFERENCES:
patent: 3024067 (1962-03-01), Brandoli
patent: 3744844 (1973-07-01), Nomaki et al.
patent: 3784252 (1974-01-01), Peterson
patent: 3807796 (1974-04-01), Wirges
patent: 5222783 (1993-06-01), Lai
patent: 5568961 (1996-10-01), Colasanti
Jr. Milton Nelson
Pro-Techtor Inter-national Services
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