Ring shaped hanging lock with replaceable core

Details Ring shaped hanging lock with replaceable core Ring shaped hanging lock with replaceable core

1990-01-05

1991-03-12

Smith, Gary L.

Locks

Portable

Padlocks

70 48, 70369, E05B 6728

Patent

active

049984233

ABSTRACT:
A ring shaped hanging lock which includes a casing, a replaceable core and a ring shaped shackle. A tool can be used to remove the core when the shackle is in an intermediate position. But when the lock is open or closed, an opening is obstructed by the shackle such that the tool cannot be inserted into the casing.

REFERENCES:
patent: 521994 (1894-06-01), Sparks
patent: 823919 (1906-06-01), Caldwell
patent: 862690 (1907-08-01), Ackerman
patent: 936863 (1909-10-01), Byrne
patent: 1463768 (1923-07-01), Wieland
patent: 1490453 (1924-04-01), Caldwell
patent: 3735612 (1973-05-01), Popovici
patent: 3785182 (1974-01-01), Van Lahr
patent: 4697444 (1987-10-01), Maffey
patent: 4776187 (1988-10-01), Evans et al.

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