Bar-tumbler type safety lock
OwnerRoger Frankinventor
Life of this patent
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Abstract
Disclosed is a bar-tumbler type safety lock, as well as a key and a coding process for said lock. According to a single-key-entry embodiment, this lock comprises a body, a two-piece washer, a latch holder and a barrel having recesses in which notched tumblers can slide and which is maintained rotatingly and removably toward the front of said body by a stud and a stopping finger retained in two annular slots made radially in this body and which can be retracted by the introduction of a special extraction key into the lock; the coding of the lock is obtained by the forming, in the annular washer-assembly groove, of notches simultaneously in each of the tumblers by a conventional turning process, with the key inserted.
Claims13
A bar-tumbler safety lock comprising:
- a hollow body having an opening at a front end thereof,
- a barrel shaped to move into the said opening in the body and rotatably mounted therein, a plurality of recesses extending longitudinally along an outward portion of the barrel, a bar-tumbler longitudinally slidable in each recess, in a first direction, and return means for opposing movement of the tumblers in said first direction, said bar-tumblers each including an operative notch therein,
- a split washer located within the body at an operative position surrounding the barrel, the outer periphery of the washer engaging the body so as to be stationary against rotation relative to the body but movable longitudinally therein from said operative position to said opening, portions of the inner periphery of the washer being located inwardly of the outermost portions of the tumblers, but outwardly of the portions of said tumblers exposed by said operative notches, whereby when operative notches of the tumblers are longitudinally aligned with the washer, the barrel can rotate relative to the washer and the body,
- a radially extending annular groove formed in the barrel at a location intermediate to the ends thereof and receiving said split washer therein, said annular groove opening into said recesses and permitting access to said tumblers when the barrel is removed from the body, the width of said groove being no greater than the widths of the operative notches of the tumblers,
- a latch holder operatively engaged with the barrel to rotate therewith,
- said barrel with said washer being movable as a unit out of said front opening of the body,
- and a restraining means for preventing longitudinal movement of the barrel out the front opening of the body in the normal rest position of the barrel in the body and for releasing the barrel for removal longitudinally out of the body at a certain given rotary position of the barrel, angularly displaced from said normal rest position.
Bar-tumbler type safety lock according to cliam 1, with a single key entry, provided with a single body and a single barrel and characterised by the fact that the central channel of the barrel, in which the key is directly inserted from the front, is separated from a broaching made in the rear part of this barrel for engaging the latch holder by a massive partition on the front face of which bears directly the end of the key fully engaged in the barrel and the periphery of which is only pierced with longitudinal hollows in which the nibs of the tumbler can engage, said hollows being extended toward the front by longitudinal ports which place each of said recesses of the tumblers in communication with the central channel and in which are guided and slide these nibs of the tumblers.
Dependencies are inferred from the claim text.