EP0250207B1
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Improvements in and relating to adjustable chairs
Assignee: Mines & West Business Furniture Ltd
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Filing: 1987-06-16
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Granted: 1992-06-10
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Expires: 2007-06-16
Abstract
No abstract record available.
Inventors
- 👤 Adrian Michael Reed
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-06 10:07
CPC Classifications
A; A47; A47C; A47C1/00; A47C1/02; A47C1/031; A47C1/032; A47C1/03261; A47C1/03283; A47C1/03255
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
240 words
A chair comprising a base (1), a seat (2) and means (5) adjustably mounting the seat on the base, the seat comprising a seat portion (3) and a backrest portion (4) and the adjustable mounting means (5) comprising a forward support member (10), a rearward support member (11), and pivotal connection means for pivotally connecting each support member (10,11) to the base (1) and to the seat portion (3) for pivotal movement relative to the base and the seat portion about generally horizontal axes (12,13,14,15) extending transversely of the seat portion (3), the support members forming opposite sides of a quadrilateral linkage, the other sides of which are provided by the base (1) and seat portion (3), which extends generally between the front and rear of the seat portion and which permits movement of the seat portion relative to the base between forward and rearward positions, characterised in that the quadrilateral linkage is arranged so that, as the seat portion (3) is moved from its forward to its rearward position, the axes (14,15) of the pivotal connection means of both the support members (10,11) to the seat portion (3) move downwardly as well as rearwardly, the axis (15) of the pivotal connection means of the rearward support member (11) to the seat portion (3) moving downwardly by a greater amount than the axis (14) of the pivotal connection means of the forward support member (10) to the seat portion (3).
Claim 2
Dependent Claim
44 words
A chair as claimed in claim 1, wherein the backrest portion (4) is connected for movement with one of the support members (11) so as to move relative to the seat portion (3) with movement of the seat portion relative to the base (1).
Claim 3
Dependent Claim
46 words
A chair as claimed in claim 1 or claim 2, wherein the quadrilateral linkage is arranged to cause the angle between the backrest portion (4) and the seat portion (3) to decrease as the seat portion (3) moves from its rearward position to its forward position.
Claim 4
Dependent Claim
27 words
A chair as claimed in any one of the preceding claims, including stop means for limiting movement of the seat portion (3) relative to the base (1).
Claim 5
Dependent Claim
39 words
A chair as claimed in any one of the preceding claims, including biassing means (16) for biassing the seat portion to its forward position and for permitting the seat portion (3) to move to its rearward position in use.
Claim 6
Dependent Claim
20 words
A chair as claimed in claim 5, wherein the biassing means (16) act on one of the pivotal connection means.
Claim 7
Dependent Claim
24 words
A chair as claimed in claim 5 or 6, wherein the biassing means (16) act between an opposite pair of the pivotal connection means.
Claim 8
Dependent Claim
29 words
A chair as claimed in any one of the preceding claims, including locking means for fixing the seat portion (3) relative to the base (1) in a desired position.
Claim 9
Dependent Claim
18 words
A chair as claimed in claim 8, wherein the locking means are associated with the biassing means (16).
Claim 10
Dependent Claim
81 words
A chair as claimed in any of the preceding claims, wherein the biassing means (16) comprises a member (16) having a variable length which is pivotally connected to the seating portion (3) in the region of the axis of the pivotal connection means of the forward support member (10) to the seat portion (3) and to the base (1) in the region of the axis of the pivotal connection means of the rearward pivotal support member (11) to the base (1).
Claim 11
Dependent Claim
23 words
A chair as claimed in claim 10, wherein the biassing member (16) includes releasable locking means for preventing variation in the length thereof.
Claim 12
Dependent Claim
49 words
A chair as claimed in any of the preceding claims, wherein the distance between the axes (13,15) of the pivotal connection means of the rearward support member (11) is longer than the distance between the pivot axes (12,14) of the pivotal connection means of the forward connecting member (10).
Claim 13
Dependent Claim
35 words
A chair as claimed in claim 12, wherein the support members (10,11) extend rearwardly from the pivotal connection means thereof to the base (1) towards the pivotal connection means thereof to the seat portion (3).
References Cited (Backward Citations)
No citation records indexed.
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