Pull-resistant lock core

Details Pull-resistant lock core Pull-resistant lock core

1981-07-16

1984-04-24

Smith, Gary L.

Locks

Operating mechanism

Key

70371, 70373, E05B 904, E05B 2704

Patent

active

044440340

ABSTRACT:
A key-removable core of figure-8 cross section having increased pull resistance. A recess is formed in the pin tumbler lobe of the core body and opens both outward through the side of the body and downward toward the key plug lobe. A control sleeve in the key plug lobe has a wide longitudinal rib which carries a core-retaining lug which extends from such rib both circumferentially of the sleeve and radially outward thereof into said recess so as to substantially increase the effective cross section of the lug for increased pull resistance. Cores with thus enlarged lugs may be used in standard receptacles. Also, the plug may be in two segments providing two end faces for retaining engagement with two shoulders in the wall of the receptacle. The lug may be further enlarged by increasing its length, and the increased length accommodated by forming the core chamber with deeper clearances and wider lug-engaging shoulders.

REFERENCES:
patent: 1384022 (1921-07-01), Best
patent: 1656854 (1928-01-01), Best
patent: 2145085 (1939-01-01), Heyer
patent: 2418080 (1947-03-01), Ledin et al.
patent: 3206958 (1965-09-01), Best
patent: 3603123 (1971-09-01), Best
patent: 3667264 (1972-06-01), Surko, Jr. et al.
patent: 3713310 (1973-01-01), Surko, Jr.
patent: 3713311 (1973-01-01), Oliver et al.
patent: 4098103 (1978-07-01), Raskevicius
patent: 4195504 (1980-04-01), Foshee
patent: 4294093 (1981-10-01), Best et al.
patent: 4328690 (1982-05-01), Oliver

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