Security lock

Details Security lock Security lock

1975-03-27

1976-04-20

McCall, James T.

Closure fasteners

Seal bolts

85 7, 292302, E05C 1302

Patent

active

039514439

ABSTRACT:
A security system for double doors which incorporates keeper blocks secured to the doors near their free edges in positions such that they overlap vertically when the doors are closed. The blocks have holes extending vertically therethrough which align when the doors are closed to form a passage for reception of a lock pin assembly having irremovable heads above and below the blocks. The lock pin can only be removed by destroying the pin or the keeper blocks or their supports. The blocks are secured to and shielded by vertically extending reinforcing ribs attached to the doors near their free edges. A pilot hole of a diameter exceeding that of the pin extends through one of the blocks perpendicular to the axis of the pin so that the pin can be cut by means of a drill, allowing the two severed sections of the pin to be moved out of the aligned holes to free the doors.

REFERENCES:
patent: 79801 (1868-07-01), Adams
patent: 151859 (1874-06-01), Dodge
patent: 1131085 (1915-03-01), Reilly
patent: 1332291 (1920-03-01), Goodell
patent: 1397101 (1921-11-01), Kelly
patent: 1571159 (1926-01-01), Posson
patent: 2843350 (1958-07-01), Wilson
patent: 3633954 (1972-01-01), Tantlinger
patent: 3768849 (1973-10-01), Sytko
patent: 3862775 (1975-01-01), Gudmundsen

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