Chairs and seats – Collapsible chair; i.e. – relatively folding bottom – back,... – With means to hold chair in plural operative configurations
Patent
1984-05-11
1986-10-21
Lyddane, William E.
Chairs and seats
Collapsible chair; i.e., relatively folding bottom, back,...
With means to hold chair in plural operative configurations
297255, 297355, 280 474, 280650, B62B 714
Patent
active
046181849
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The invention relates to a foldable chair frame in which, when the frame is in its erected condition, a seat back is movable between an upright position and a lie-back position.
BACKGROUND ART
In known foldable chair frame constructions, such as in the lie-back push chair disclosed in European Patent Specification No. 0 000 937, the seat back is supported in its upright and lie-back positions by adjustable links extending respectively from rear legs of the frame and back rest members respectively disposed on opposite sides of the seat back. In order to move the seat back between its upright and lie-back positions, both links must be released, moved to their new supporting positions, and then relocked in position. Moreover, during this operation, it is normally preferable to ensure that the chair frame is not supporting any load. Thus, in the case of a push chair, it is necessary to remove a child carried in the push chair whenever the seat back is moved between its upright and lie-back positions.
DISCLOSURE OF THE INVENTION
It is an object of the present invention to provide a foldable chair frame in which, when the frame is erected, a seat back is movable between an upright position and a lie-back position and support means are provided for facilitating movement of the seat back into and out of its upright and lie-back positions.
This is achieved by providing the chair back with support means which are releasably engagable with different parts of the frame when the seat back is in its upright and lie-back positions.
An embodiment of the invention is hereinafter described by way of example, with reference to the accompanying drawings.
BRIEF DISCRIPTION OF THE DRAWINGS
FIG. 1 is a perspective view of a collapsable lie-back push chair as disclosed in European Patent Specification No. 0 000 937, modified so as to accord with the present invention;
FIG. 2 is a perspective view of part of the push chair shown in FIG. 1, to a slightly larger scale, showing more clearly support means for supporting a seat back, forming part of the push chair, in a lie-back position;
FIG. 3 is a perspective view similar to FIG. 2, but showing the seat back moved from its lie-back position part way towards its upright position; and
FIG. 4 is a perspective view similar to FIGS. 2 and 3, but showing the seat back in its upright position.
MODE FOR CARRYING-OUT THE INVENTION
As shown in FIG. 1, the collapsable lie-back push chair comprises two base members 11a which are pivotably interconnected to form a laterally collapsable X-frame 11 in which the opposite ends of the two base members 11a provide front and back corners of the X-frame. Two back members 12 are disposed on co-planar axis and respectively extend upwardly from pivotal connections at the back corners of the X-frame. Two lower brace members 13 are respectively pivoted at their lower ends, to the front corners of the X-frame 11 and two upper brace members 14 are respectively pivoted at their upper ends to the upper ends of the back members 12. Two knuckle joints 16 respectively connect the two lower brace members 13 to the two upper brace members 14 so as to prevent folding of the back members 12 towards the X-frame 11 when the chair frame is extended with the lower brace members 13 respectively extending substantially colinearly with the upper brace members 14 and the front or rear corners of the X-frame 11 are held apart, but in such a way as to allow the knuckle joints 16 to move towards the back corners of the X-frame 11 thus permitting folding of the back members 12 towards the X-frame 11 when the back corners of the X-frame 11 are allowed to move towards each other.
Two seat support members 15 are respectively pivoted to the two back members 12 adjacent the back corners of the X-frame 11 and are respectively pivoted to the lower brace members 13 between the knuckle joints 16 and the front corners of the X-frame 11. Two upwardly extending back reinforcements 29b, which are disposed on co-planer axis, form part of a laterally collapsab
REFERENCES:
patent: 2751232 (1956-06-01), Sundberg
patent: 4089543 (1978-05-01), Osborne
patent: 4398748 (1983-08-01), Duvignacq
Andrews MacLaren Limited
Cranmer Laurie K.
Lyddane William E.
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