Construction of and latching arrangement for large-size overhead

Details Construction of and latching arrangement for large-size overhead Construction of and latching arrangement for large-size overhead

1995-04-13

1996-10-01

Lindsey, Rodney M.

Closure fasteners

Bolts

Multiple

292125, 292201, 292DIG36, 160209, 160213, E05C 1910

Patent

active

055606580

ABSTRACT:
The large overhead bi-fold doors of the present invention are hinged along a centerline and hung by hinges from the top of the door opening. A motor mounted inside and above the door opening is connected to one end of a cable, the other end of which passes around a pulley at the bottom of the door and then upwardly to a latching mechanism located beneath the horizontal hinge line of the doors. When the motor is activated, the cable pulls on a dog or arm connected to a shaft which also carries the hook of a latching device. The hook engages a strike attached to the frame of the building on which the door is mounted, and when the motor is activated, the cable pulls on the dog which disengages the hook from the strike and further tension on the cable by the motor raises the door to an elevated position. When the door is lowered and is approaching closed position, the cable is slackened, allowing a torsion spring connected to the shaft to rotate the latch into engaging connection with the strike and to draw the door tightly against the sides of the opening in the building.

REFERENCES:
patent: 1135768 (1915-04-01), Clay
patent: 1720554 (1929-07-01), Johnson
patent: 2703247 (1955-03-01), Wolf et al.
patent: 3177022 (1965-04-01), McKee et al.
patent: 3258062 (1966-06-01), Lambert
patent: 5168914 (1992-12-01), Keller

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