Hemispherical lock cylinder

Details Hemispherical lock cylinder Hemispherical lock cylinder

1979-05-31

1981-04-21

Wolfe, Robert L.

Locks

Operating mechanism

Key

70362, 70364A, 70395, 70417, E05B 2700

Patent

active

042625050

ABSTRACT:
A cylinder (10) which is highly pick-resistant and also highly resistant to other means of forced entry is provided. The cylinder is of a unique hemispherical construction, involving a hemispherical shell (12), hemispherical plug (13) and hemispherical plug insert (14). In a preferred embodiment, the keyway (28) includes two keyways (23, 25). The key is of a correspondingly complex configuration including a generally circular handle portion (28) and two generally semicircular tumbler pin actuating portions (36 and 37). The hemispherical configuration and the multiplicity of keyways renders it particularly difficult to pick the lock.

REFERENCES:
patent: 616751 (1898-12-01), Vedden et al.
patent: 898767 (1908-09-01), Mercer
patent: 1237115 (1917-08-01), Stein
patent: 2089300 (1937-08-01), Schlitz
patent: 3621688 (1971-11-01), Asman

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