Locks – Operating mechanism – Using a powered device
Patent
1974-10-24
1976-02-03
Craig, Jr., Albert G.
Locks
Operating mechanism
Using a powered device
70356, 70365, E05B 4700
Patent
active
039357201
ABSTRACT:
The rotatable plug of a cylinder lock has an axially extending outwardly open cavity paralleling a key slot and normally registering with an axially extending groove in the inner wall surface of the surrounding cylinder, the groove and the cavity being bridged by a locking bar with sloping flanks cammable radially inwardly, against the force of compression springs within the recess, upon rotation of the plug relative to the cylinder. Seated in the cavity are a plurality of axially spaced tumblers which are freely rotatable about pins transverse to the cylinder axis and have recesses alignable, in a predetermined operating position, with respective projections on the locking bar to enable the inward camming of the latter; each tumbler carries a pair of permanent magnets confronting a thin partition between the cavity and the key slot. Upon insertion of the right key into the slot, pairs of magnets on the key surface adjoining the partition coact with the magnets on the tumblers to align their recesses with the associated projections on the locking bar. A longitudinal rib on the key, fitting into an axially extending channel of the key slot, prevents improper insertion of the key and has a notch engageable by a spring-loaded latch, transversely slidable in the plug near its entrance end, which blocks rotation of the plug if a key or other object is partly introduced into the slot.
REFERENCES:
patent: 3486355 (1969-12-01), Halfyard
patent: 3499302 (1970-03-01), Spain et al.
patent: 3499303 (1970-03-01), Spain
patent: 3654782 (1972-04-01), Heimann
patent: 3722240 (1973-03-01), Spain et al.
patent: 3855827 (1974-12-01), Hallman et al.
Craig, Jr. Albert G.
Dubno Herbert
Montague Ernest G.
Ross Karl F.
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