Chair tilting mechanism
First Claim
1. A chair tilting mechanism comprising:
- a) a fixed support having means for connection to a ground-engaging part of a chair;
b) a seat support having means for supporting a seat for the chair;
c) a first pivot connection between the seat and fixed supports;
d) a backrest support having an upper end and a lower end;
e) a second pivot connection between the backrest and seat supports, said pivot connection being located rearwardly of the first pivot connection and having a pivot axis which is substantially parallel to that of the first pivot connection;
f) biasing means mounted between the fixed and seat supports, said biasing means acting between anchorages on the fixed and seat supports which are located forwardly of the first pivot connection;
g) a single elongate link member having means for forming pivot connections at opposite ends thereof;
h) a third pivot connection between one end of said link member and the backrest support; and
i) a fourth pivot connection between the opposite end of said link member and the fixed support, said third and fourth pivot connections completing interconnection of the fixed, seat and backrest supports for synchronized tilting of the seat support with respect to the backrest support.
1 Assignment
0 Petitions
Accused Products
Abstract
A chair tilting mechanism (1) is disclosed which has a fixed support (2), a seat support (3) and a backrest support (4). The seat support (3) is pivotally connected to the fixed support (2) by a pivot pin (5). The backrest support (4) is pivotally connected to the seat support (3) by a pivot pin (6). There is additionally provided a link (7) connected by pivot pins (8,9) to the backrest support (4) and the seat support (2). Because of the link (7), rotation of either the backrest or seat support causes the other of the backrest or seat support to tilt in a pre-determined synchronised manner. The manner in which synchronised tilting occurs is set by the interconnection of the various parts. The invention also provides a means (41) for pre-setting the interconnection.
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Citations
7 Claims
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1. A chair tilting mechanism comprising:
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a) a fixed support having means for connection to a ground-engaging part of a chair; b) a seat support having means for supporting a seat for the chair; c) a first pivot connection between the seat and fixed supports; d) a backrest support having an upper end and a lower end; e) a second pivot connection between the backrest and seat supports, said pivot connection being located rearwardly of the first pivot connection and having a pivot axis which is substantially parallel to that of the first pivot connection; f) biasing means mounted between the fixed and seat supports, said biasing means acting between anchorages on the fixed and seat supports which are located forwardly of the first pivot connection; g) a single elongate link member having means for forming pivot connections at opposite ends thereof; h) a third pivot connection between one end of said link member and the backrest support; and i) a fourth pivot connection between the opposite end of said link member and the fixed support, said third and fourth pivot connections completing interconnection of the fixed, seat and backrest supports for synchronized tilting of the seat support with respect to the backrest support. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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Specification