Mutually counterbalancing upper and lower flap doors of wide doo

Details Mutually counterbalancing upper and lower flap doors of wide doo Mutually counterbalancing upper and lower flap doors of wide doo

1975-09-23

1977-05-24

Frazier, Roy D.

Movable or removable closures

Closures interconnected for concurrent movement

Closures mounted for swinging

296 51, E05C 706

Patent

active

040246710

ABSTRACT:
Upper and lower flap doors respectively hinged to an upper lintel member and to a lower sill member of a doorway frame constituting almost the entire side wall of the body of a van type motortruck to swing open respectively outwardly and upwardly to a horizontal position and outwardly and downwardly to a vertical position are intercoupled by a coupling device comprising two coupling mechanisms installed close to two posts constituting side members of the doorway frame, each coupling mechanism comprising members intercoupling the flap doors to synchronize their movements and cause gravitational forces acting thereon to counterbalance each other, thereby reducing the physical effort required for manual opening and closing of the doors.

REFERENCES:
patent: 1067146 (1913-08-01), Schoell
patent: 2220202 (1940-11-01), Bohne
patent: 2249932 (1941-07-01), Beale
patent: 2538930 (1951-01-01), Zummach
patent: 2606786 (1952-08-01), Howard
patent: 2772913 (1956-12-01), Holan et al.

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