Tri-fold mechanism

Details Tri-fold mechanism Tri-fold mechanism

1985-02-05

1986-05-27

Murtagh, John E.

Beds

Sofa bed

Link supported unfolding

5 29, 5 31, A47C 1704

Patent

active

045906300

ABSTRACT:
A convertible sofa-bed is disclosed which has a seating area, a back rest, and a mechanism support frame located below the seating area. A folding mechanism for supporting a mattress when the mechanism is unfolded and for supporting a seat in the seating area when folded with the mechanism located within the frame below the seat is also provided. The mechanism has first, second and third main sections, a fourth auxiliary section pivotally interconnecting the first and second sections, a fifth auxiliary section pivotally interconnecting the second and third sections, and a linkage mechanism operatively engaged with the third section for supporting the mechanism in the support frame. An additional linkage mechanism permits the three main sections to be folded over one another in an overlapping generally parallel relationship, so that the entire mechanism can be supported within the frame below the seating area of the sofa-bed.

REFERENCES:
patent: 3292188 (1966-12-01), Gerth
patent: 3503081 (1970-03-01), Mikos
patent: 4080692 (1978-03-01), Eakins
patent: 4200941 (1980-05-01), Gill et al.
patent: 4301559 (1981-11-01), Geenberghe
patent: 4398312 (1983-08-01), Duff
patent: 4439878 (1984-04-01), Stevens

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