Device for automatically opening and closing hinged door

Details Device for automatically opening and closing hinged door Device for automatically opening and closing hinged door

1985-05-07

1986-07-15

Kannan, Philip C.

Movable or removable closures

With specified means to effect emergency release to closure

49334, E05B 6510, E05F 1512

Patent

active

045998248

ABSTRACT:
A device for automatically opening and closing a hinged door includes a motor having a drive shaft, a speed reducer, an operating shaft adapted to be connected to the hinged door and operatively coupled through the speed reducer to the drive shaft, a chain sprocket fixed to the operating shaft, a chain trained in mesh around the chain sprocket, a first rod having an end coupled to an end of the chain, with a first fixed to an opposite end of the first rod, a second rod having an end coupled to an opposite end of the chain, with a second flange fixed to an opposite end of the second rod, a first tubular body in which the first rod is axially movably disposed, a first spring disposed around the first rod within the first tubular body for normally urging the first flange in a direction away from the chain sprocket, a second tubular body in which the second rod is axially movably disposed, and a second spring disposed around the second rod within the second tubular body for normally urging the second flange in a direction away from the chain sprocket. One of the first and second springs has a smaller spring force.

REFERENCES:
patent: 3064964 (1962-11-01), Carlson
patent: 3369323 (1968-02-01), Millard et al.
patent: 4045914 (1977-09-01), Catlett
patent: 4220051 (1980-09-01), Catlett
patent: 4333270 (1982-06-01), Catlett

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