Security chain lock for doors

Details Security chain lock for doors Security chain lock for doors

1985-04-15

1987-03-10

Moore, Richard E.

Closure fasteners

Extension link

Chain

70143, E05C 1736

Patent

active

046486429

ABSTRACT:
A chain door lock includes first part attached to a door adjacent the free edge of the door, a second part attached to the door jamb, and a chain attached to the second part and removably attached to the first part. The first part includes a horizontal spring chamber, a slide element within the spring chamber, a chain holder attached to the slide element, and a shock-absorbing coil spring between the slide element and the spring chamber. The second part includes a leaf spring. The chain is sufficiently long that the door may be partially opened without compressing either spring. The coil spring is sized to absorb a substantial impact, as from the body of a would-be intruder.

REFERENCES:
patent: 198553 (1877-12-01), Von Auer
patent: 2704218 (1955-03-01), Claud-Mantle
patent: 3338612 (1967-08-01), Howard
patent: 3796450 (1974-03-01), Schulz
patent: 4422678 (1983-12-01), Tuckett et al.

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