Tiltable garage door locking mechanism - has spring loaded ratchet lever engaging with stop lug in open box section-type horizontal guide rail

摘要

The locking mechanism for motor driven tiltable garage door has its upper edge (5) linked with the operating mechanism by a push rod (13) jointed with a trolley (7) travelling in guide rail (8). The movement of the trolley is controlled by the endless chain (9), driven by electric motor-mounted sprocket and sheave pulley. There is a certain dead travel of the shaft before the trolley is carried along, when a stop lug at the ends of the shaft reaches the sliding block, At one end of the sliding block a spring-loaded ratchet lever is fitted, which snaps into locking engagement with a stop lug fitted within the guide rail box section, when the trolley reaches this particular terminal position. During the movement in opposite direction an inclined tongue fitted to the adjacent shaft end stop lug, which lifts the ratchet-clear of the top lug, so that the trolley continues its travel. In case of power failure the ratchet is released by hand through a pull rope arrangement.