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US 2002/0158474 A1Published application
Lock
AssigneeBanham Patent Lock Limited
InventorBrian Edward Cowper
Life of this patent
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AssigneeBanham Patent Lock Limited
InventorBrian Edward Cowper
Estimating the term…
A lock for a door (10) comprising a casing (11), a bolt (55) operable to extend from or retract into the casing and manually operable bolt retention means to retain the bolt in its retracted state even when an automatically operating bolt holding member (74) is released by inwards movement of a bolt release member (69). The bolt retention means comprises a snib (106) having a part receivable in an opening (103) in the bolt (55) when the bolt is manually moved into the case from its normally retracted position. Once the snib part is in the opening and the inwards force on the bolt removed, the spring acting on the bolt moves the bolt to its normally retracted position, where it is then retained by the snib. To release the retention, the bolt is again moved further into the case, whereupon the snib part is moved clear of the bolt opening under spring bias, and the unretained bolt is moved by its bias to its normally retracted position.
A lock for a wing movable between respective open and closed positions relative to a frame comprising a casing, a bolt operable to extend from the casing or to retract into the casing to a first normally retracted position, and bolt retention means manually operable at one side of the wing, in use, the bolt retention means being inoperable when the bolt is in its first, normally retracted position, the bolt being movable in a direction into the casing from its first, normally retracted position, to a second retracted position in which said bolt retention means is operable to a position to retain the bolt retracted.
Dependencies are inferred from the claim text.