Anti-drop device

A door system of comprising, a door movable between a closed vertical position and an open horizontal position, a cable attached to said door and normally providing a counterbalancing force to said door, said cable extending along a vertical line adjacent said door and being normally substantially taut, and an anti-drop assembly having a pawl pivotally supported on said door and attached to said cable, a stop surface positioned adjacent to said door, and a spring operable to urge said pawl toward engagement with said stop surface, wherein when taut said cable opposes the biasing force of said spring and wherein upon said cable going slack said spring urges said pawl into engagement with said stop surface to decelerate said door, said pawl having a body portion with a head extending from said body portion at an oblique angle relative to said body portion.

A door system of comprising, a door movable between a closed vertical position and an open horizontal position, a cable attached to said door and normally providing a counterbalancing force to said door, said cable extending along a vertical line adjacent said door and being normally substantially taut, and an anti-drop assembly having a pawl pivotally supported on said door and attached to said cable, a stop surface positioned adjacent to said door, and a spring operable to urge said pawl toward engagement with said stop surface, wherein when taut said cable opposes the biasing force of said spring and wherein upon said cable going slack said spring urges said pawl into engagement with said stop surface to decelerate said door, said pawl having a body portion that defines a spring bore with said spring being at least partially received within said spring bore and said spring being a ball plunger having a spring-loaded plunger housed within a hollow casing, said casing being secured within said spring bore and said spring loaded plunger being axially moveable relative to said casing to apply the biasing force.

A door system of comprising, a door movable between a closed vertical position and an open horizontal position, a cable attached to said door and normally providing a counterbalancing force to said door, said cable extending along a vertical line adjacent said door and being normally substantially taut, and an anti-drop assembly having a pawl pivotally supported on said door and attached to said cable, a stop surface positioned adjacent to said door, and a spring operable to urge said pawl toward engagement with said stop surface, wherein when taut said cable opposes the biasing force of said spring and wherein upon said cable going slack said spring urges said pawl into engagement with said stop surface to decelerate said door, said pawl has a cable bore adapted to receive an end of said cable and wherein said end of said cable is secured to said pawl within said cable bore and a first bore in said pawl in registry with said cable bore and a fastener insertable through said first bore and protruding into said cable bore, whereby said fastener clamps said cable within said cable bore.

In a door system having a door movable between a closed vertical position and an open horizontal position and having a cable interconnected to said door near the bottom thereof and extending along a vertical line adjacent said door and being normally substantially taut, an anti-drop assembly comprising, a pawl having a body portion fixedly secured to the cable and a pivot portion rotably mounted on a pivot supported on the door to transmit a selected counterbalance force through said pivot support to the door, a stop surface mounted adjacent to the door, and means for biasing said pawl toward engagement with said stop surface, whereby said cable, when taut, holds the pawl against the force of said means for biasing and whereby when the tension is released from the cable said means for biasing urges said pawl into engagement with said stop surface to decelerate the door.