High security lock
OwnerJerry R. Smithinventor
Life of this patent
Estimating the term…
Abstract
A pick resistant lock includes a secondary hole in the cylinder which is turned into alignment with a driver pin as the lock is being opened. A shuttle pin slidably positioned in the secondary bore prevents the driver pin from entering the secondary bore when a key bit is inserted in the key way. However, when there is no key bit in the key way, the driver pin will drop into the secondary bore and prevent opening the lock. Two embodiments of the lock also include features to prevent the driver pin from being pushed out of the secondary bore without disassembling the lock. In one of these embodiments, the shuttle pin is locked against movement by a tertiary pin, and in another embodiment, the service pin blocks access to the shuttle pin to accomplish this result.
Claims8
In cylinder lock apparatus comprised geneerally of a cylinder housing, a cylindrical key plug positioned rotatably in said cylinder housing and having a keyway channel extending longitudinally therethrough and a service pin bore extending radially therein from a peripheral surface to intersect said keyway channel, a chamber housing on said cylinder housing with a chamber pin bore therein extending radially outward in axial alignment with said service pin bore, a driver pin slideably positioned in said chamber pin bore and biased toward said key plug, a key bit adapted for removeable insertion into said keyway channel to engage said service pin, the improvement comprising:
- said key plug also having a secondary bore therein in angular spaced relation to said service pin bore and extending radially inward in said key plug, said secondary bore being axially alignable with said chamber pin bore by rotation of said key plug in said cylinder housing, spacer means positioned in said secondary bore and being interactive with said key bit when said key bit is positioned in said keyway for prohibiting protrusion by said driver pin into said secondary bore while allowing protrusion therein by said driver pin when said key bit is not positioned in said keyway channel and said key plug is rotated to axially align said secondary bore with said chamber pin bore in such a manner as to prohibit further rotation of said key plug in relation to said cylinder housing, and lock means for preventing removal of said driver pin from said secondary bore once it has protruded therein.
In cylinder lock apparatus comprised of a cylinder housing, a cylindrical key plug positioned rotatably in said cylinder housing and having a keyway channel extending longitudinally therethrough and a service pin bore extending radially therein from a peripheral surface to intersect said keyway channel, a chamber housing on said cylinder housing with a chamber pin bore therein extending radially outward in axial alignment with said service pin bore, a driver pin slideably positioned in said chamber pin bore and biased toward said key plug, and a service pin slideably positioned in said service pin bore, and a key bit adapted for removeable insertion into said keyway channel to engage said service pin, the improvement comprising:
- a shuttle pin positioned slideably in a shuttle pin bore extending radially outwardly from said keyway in said key plug an angular spaced distance from said service pin bore and axially alignable with said chamber pin bore by rotating said key plug in relation to said chamber housing, said shuttle pin being of a length equal to the distance between the peripheral surface of said key plug and said key bit when said key bit is positioned in said keyway channel, and said shuttle pin bore also being adapted to receive a portion of said driver pin therein when said shuttle pin bore is aligned with said chamber pin bore and said key bit is not positioned in said keyway channel, and
- a lock pin positioned slideably in a lock pin bore in said key plug that intersects said shuttle pin bore, said lock pin being biased toward said shuttle pin bore and adapted to engage and retain said driver pin in said shuttle pin bore when said driver pin is positioned across the shear line between said key plug and said cylinder housing.
Dependencies are inferred from the claim text.