Beds – Sofa bed – Link supported unfolding
Patent
1984-08-16
1986-06-03
Holko, Thomas J.
Beds
Sofa bed
Link supported unfolding
5 29, 5 56, A47C 1704
Patent
active
045921024
ABSTRACT:
A rectangular mattress support frame has side rails formed of rail sections which are pivotally interconnected for movement between a folded seating position and an unfolded sleeping position. In the sleeping position, side rail portions projecting forwardly of the furniture frame are supported on a forward support leg and a center support leg. When a first rail section at the forward end of the side rail is pivoted upwardly, a linkage moves the forward support leg toward the first rail section, and this linkage also produces upward pivotal movement of a second rail section relative to a third rail section. The center leg is moved to a partially raised position in response to pivotal movement between the second and third rail sections, and it is moved to a fully raised position when a fourth rail section at the rear end of the side rail moves from a generally horizontal position to a generally vertical position. The fourth rail section is the back rail section, and it is one element of a four bar linkage which also includes a stationary mounting rail and two back support links which support the back rail section on the mounting rail. The back rail section moves translationally and inclinationally from a generally horizontal sleeping position to a generally vertical, rearward pitched, seating position. A lift lever on the mounting rail has one end connected to a tension spring and another end connected to a link which supports the side rail on the mounting rail.
REFERENCES:
patent: 2832965 (1958-05-01), Pokorny, Jr.
patent: 3292188 (1966-12-01), Gerth
patent: 3298041 (1967-01-01), Rogers, Jr.
patent: 3516096 (1970-06-01), Mikos
patent: 3657747 (1972-04-01), Rogers, Jr. et al.
patent: 3871035 (1975-03-01), Gerth
patent: 4068328 (1978-01-01), Gerth
Holko Thomas J.
Trettel Michael F.
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