Movable or removable closures – Safety means responsive to obstruction to closure – Closure drive stopping or reversal
Patent
1975-12-24
1976-12-14
Gilliam, Paul R.
Movable or removable closures
Safety means responsive to obstruction to closure
Closure drive stopping or reversal
49139, 49362, 318266, E05F 1510
Patent
active
039966976
ABSTRACT:
An operator for opening and closing an upwardly acting door, which operator includes an elongated rotatable drive screw having one end thereof drivingly connected to a power unit and the other end thereof disposed adjacent the upper edge of the door opening. The rotatable drive screw has a carriage engaged therewith which is slidably confined by an elongated guide rail for slidable movement therealong, which carriage is connected by a drawbar to the door for controlling the movement thereof. A floatable bearing arrangement is slidably disposed within the rail and has portions thereof positioned on opposite sides of the carriage so as to be movable along the rail in response to carriage movement, thereby providing an intermediate support for the drive screw. The drive screw is supported for limited axial movement and coacts with a control device for causing reversing of the door movement when the door strikes an obstruction when moving in its closing direction. Upon striking an obstruction, the reaction of the drive mechanism causes a slight axial movement of the screw in a direction away from the door opening, which in turn activates the control device and its associated switch for reversing the door movement. The control device is independent of the limit switches which deactivate the power unit when the door reaches its fully opened and fully closed positions.
REFERENCES:
patent: 2253170 (1941-08-01), Dunham
patent: 2882045 (1959-04-01), Moore
patent: 2991406 (1961-07-01), Seith et al.
patent: 3240484 (1966-03-01), Klamp
patent: 3481074 (1969-12-01), Moss
Bailey Morris W.
Boyles Nesbitt A.
Harris Donald S.
Sumnicht Victor
Dorner Kenneth J.
Gilliam Paul R.
Overhead Door Corporation
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