Abstract A lock cylinder is formed having a plurality of projections extending from the periphery of its body in radial directions and having a plurality of pin bores spaced apart by a predetermined distance. The pin bores extend to a keyway in a rotatable barrel housed in the body. Tumbler pins, driver pins and springs are inserted in a desired number of selected pin bores, whereby the lock cylinder is adapted for a vast number of different locking combinations. The rear end of the barrel incorporated in the lock cylinder extends outward from the body of the lock cylinder. Within the keyway, at the extension thereof, there is provided a slidable locking plate which is usually urged by a spring into engagement with a latch portion formed in the body to prevent the rotation of the barrel. The locking plate thus serves as a pickproof means and is freed from locking engagement when a key is inserted into the keyway and acts as an actuating member for the locking mechanism when the barrel is rotated.
A pin-tumbler lock cylinder including a barrel rotatably disposed in a body of said cylinder, pin bores extending through the body and the barrel to a keyway and tumbler pins, driver pins and springs inserted in said pin bores such that different locking combinations are provided depending upon whether or not said pin and springs are accommodated in a particular pin bore, said lock cylinder comprising a locking plate disposed at the end of a rearward extension of the barrel and rotatably supported in the keyway, said locking plate being slidable within a range defined by a slot formed in said locking plate when a key is inserted in the keyway, said locking plate being mechanically urged into engagement with a latch portion formed in the body.
Claim 2
Dependent Claim
127 words
A pin-tumbler lock cylinder including a barrel rotatably disposed in a body of said cylinder, pin bores extending through the body and the barrel to a keyway and tumbler pins, driver pins and springs inserted in said pin bores such that different locking combinations are provided depending upon whether or not said pin and springs are accommodated in a particular pin bore, said lock cylinder comprising a locking plate disposed at the end of a rearward extension of the barrel and rotatably supported in the keyway, said locking plate being slidable within a range defined by a slot formed in said locking plate when a key is inserted in the keyway, said locking plate being mechanically urged into engagement with a latch portion formed in the body.
Claim 3
Dependent Claim
64 words
The pin-tumbler lock cylinder as set forth in claim 1 wherein when said locking plate is disengageable from the latch portion of the body by a key insertable into the keyway, the locking plate is rotated along with thE barrel by the rotation of the key to come into contact with a locking mechanism and act as an actuating member for an unlocking operation.