MOVABLE BARRIER OPERATION HAVING CABLE TENSION SENSOR AND DOOR LOCK MECHANISM
摘要
<p>A cable tension sensing apparatus is mounted on a wall having a door opening. The jack shaft garage door operator includes a drive unit having an electric motor for driving a jack shaft mounted above a door opening. A pull-up cable drum is connected to the jack shaft and has a multi-strand steel pull-up cable that may be payed out to lower a door or wound up to raise the door. The cable tension sensing apparatus includes a cable guide to retain the cable a substantially fixed distance from the wall and a spring driven cable follower which urges against the cable extending between the drum periphery and the cable guide. An alerting switch is connected to the cable follower and sends a signal indicating loss of cable tension when the cable follower moves beyond a predetermined distance. Additionally, the movement of the cable follower moves a door blocking arrangement to a position to block movement of the door when being raised without use of the motor.</p>
申请公布号
EP1389258(A4)
申请公布日期
2005.02.09
申请号
EP20020726806
申请日期
2002.04.24
申请人
THE CHAMBERLAIN GROUP, INC.
发明人
MCCARTNEY, PHILLIP, A.;DUTKA, ROBERT, E.;GAVEL, ANDREW;CHEN, WILLIAM;OLMSTED, ROBERT, J.