Closure fasteners – Bolts – Sliding
Patent
1976-12-03
1977-09-27
Frazier, Roy D.
Closure fasteners
Bolts
Sliding
292177, 292DIG15, E05C 102
Patent
active
040507238
ABSTRACT:
Mechanism for securing a door in open or closed position comprises a casing which is secured to the inside of the door near the bottom and has vertically aligned openings to receive a vertically movable hollow cylinder. The cylinder is biased upwardly by a helical spring in the casing, upward movement of the cylinder being limited by a plate which is affixed to the cylinder and engageable with the upper end wall of the casing. A plunger which is reciprocable in the cylinder is biased downwardly relative to the cylinder and is held in an upper or retracted position by a latch provided at the upper end of the cylinder. When the latch is released, the plunger is forced downwardly by its spring into engagement with the floor or with a socket set in the floor. When the cylinder is pushed downwardly far enough for the latch to engage the plunger and is then released, the cylinder and plunger are moved to their upper positions by the spring acting on the cylinder.
REFERENCES:
patent: 288028 (1883-11-01), Coultaus
patent: 587131 (1897-07-01), Markert
patent: 643850 (1900-02-01), Rogers
patent: 648299 (1900-04-01), Reeves
patent: 658122 (1900-09-01), Rogers
patent: 777408 (1904-12-01), Fletcher
patent: 834398 (1906-10-01), McKenzie
patent: 1768326 (1930-06-01), Miller
Adams Bruce L.
Burns Robert E.
Frazier Roy D.
Holko Thomas J.
Lobato Emmanuel J.
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