Counterbalanced door assembly with reduced initial closing force

Details Counterbalanced door assembly with reduced initial closing force Counterbalanced door assembly with reduced initial closing force

1992-10-01

1993-04-27

Kannan, Philip C.

Movable or removable closures

With means mounting closure for swinging

With biasing means

49379, 52 72, E05F 110

Patent

active

052050734

ABSTRACT:
A door closing mechanism, preferably mounted on a counterbalanced door assembly, which provides a mechanical advantage to close the door and overcome the forces of friction, inertia and any counterbalancing forces. A slot plate with a curved control slot is mounted to the door. A control arm, pivotally mounted at one end to the door frame, has a handle and slot engager mounted at the other end. The slot engager slides along the control slot and pulls the door closed as the handle is pulled. The control slot is preferably curved only along a first portion and straight in a second portion to provide greater mechanical advantage at the beginning of its motion.

REFERENCES:
patent: 3896595 (1975-07-01), Anghinetti et al.
patent: 4145843 (1979-03-01), Lyons
patent: 4873791 (1989-10-01), Lyons, Sr.
patent: 5067277 (1991-11-01), Magalotti
patent: 5136811 (1992-08-01), Lyons, Sr.

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