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:
Jul. 25, 2000
Filed:
Jan. 27, 1999
Scott A Crowner, Lynnwood, WA (US);
Brian G Denault, Seattle, WA (US);
Gerald N O'Berto, Colorado Springs, CO (US);
Hy-Security Gate, Inc., Seattle, WA (US);
Abstract
A barrier operator moves a movable barrier using a motive source having a movable member, a station, and first and second flexible members. The station includes a drive system operatively coupled to the movable member of the motive source. The drive system includes input and output members. The first and second flexible members each have first and second ends and a portion extending from the station. The first ends of each flexible members are operatively coupled to the movable barrier and the second ends of each of the flexible members are operatively coupled to the output drive system member of the station. Aspects include the first and second flexible members being cable or wire. Other aspects include the output drive system member of the station being a spool. The drive system further includes a gear box operatively coupled to the spool. Other aspects include the movable barrier being a gate or door. Further aspects include the motive member being a 3-phase alternate current electric motor having a motor shaft as the movable member. The electric motor is supplied with 3-phase electrical power having voltage levels less than 65 volts root mean square. Additional aspects include calibration of fully opened and closed positions of the movable barrier, automatically positioning of the movable barrier by the barrier operator, supplying 0 hertz electrical power to the electric motor for heating based upon a temperature threshold, and control of frequency of the electrical power supplied to the motor based according to a continuous function of barrier position.