Beds – Sofa bed – Link supported unfolding
Patent
1989-02-23
1990-03-06
Grosz, Alexander
Beds
Sofa bed
Link supported unfolding
5 29, A47C 1704
Patent
active
049053280
ABSTRACT:
A sofa-bed assembly comprising a rear vertical section, a lower horizontal section, a front vertical section, and an upper horizontal section pivoted to one another in succession for folding movement between a collapsed sofa condition and an extended bed contidion. A mattress folded within the assembly presses upwardly against the upper horizontal section, and a locking linkage arrangement resists the tendency of the folded mattress to swing the upper horizontal section upwardly out of a horizontal plane when the assembly is in its collapsed condition. Release of the locking linkage involves initially compressing the mattress further, thereby increasing the force required to open the bed. Additional links respond to unfolding of the rear leg, which supports the unfolded lower horizontal section for relieving some of the pressure of the mattress on the upper horizontal section, thereby reducing the force required to open the locking linkage to permit unfolding of the upper horizontal section. The additional links serve to release the mattress pressure by causing the locked-together upper horizontal section and front vertical section to pivot through a small angle, about the pivot joining the front vertical section and lower horizontal section, in the direction of unfolding of the section.
REFERENCES:
patent: 3284811 (1966-11-01), Rogers, Jr.
patent: 4682375 (1987-07-01), Pokorny
Grosz Alexander
Levine Alan H.
Louis Pokorny Company, Inc.
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