The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 22, 1978
Filed:
Sep. 19, 1977
Maw Huei Lee, Cincinnati, OH (US);
Clopay Corporation, Cincinnati, OH (US);
Abstract
A garage door operator includes a drive screw, rotationally and longitudinally movable in a shuttle track or guide rail, and a screw-driven shuttle mounted on the track and connected to the door. A lever arm is attached to the screw at a rearward end thereof and is pivoted to the operator at one side of the screw. Another end of the lever arm, adjacent an opposite side of the screw, is operatively disposed with respect to control switches and is spring-loaded, whereby door engaged obstructions cause the rotating screw to move longitudinally, against the spring bias, and to actuate, through the lever arm, a switch for stopping or for reversing the operator motor. A sleeve coupling permits longitudinal screw movement with respect to the operator's motor, and is provided with means to permit continued motor operation, drivingly disengaged from the screw, upon control malfunction, in order to prevent damage or injury.