USRE1470E - Improvement in locks - Google Patents
Improvement in locks Download PDFInfo
- Publication number
- USRE1470E USRE1470E US RE1470 E USRE1470 E US RE1470E
- Authority
- US
- United States
- Prior art keywords
- tumblers
- tumbler
- bolt
- lock
- locks
- Prior art date
Links
- 238000010276 construction Methods 0.000 description 1
- 230000000994 depressed Effects 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 231100000773 point of departure Toxicity 0.000 description 1
- 239000004544 spot-on Substances 0.000 description 1
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Definitions
- this lock I have introduced several iinprovements, the principal ones relating, iirst, to the method of operating the tumblers, and, secondly, to the method of preventing picking.
- difficulty is often experienced in setting the tumblers, imperfect sight of the operator, or want of light, or g a wrong position of the eye preventing the indices usually employed from being brought to the exact spot which they must assume before the tumblers are adjusted and the lock can be unlocked.
- this defeet I have combined a tumbler with a revolving tooth on a separate shaft, the combination being such that a whole revolution of the tooth moves the tumbler only through the angular distance between two of its consecutive notches.
- Locks of this class have also been picked by new processes impossible to describe fully except in a specification of inordinate length, but depending for their success upon distinguishing one tumbler from the others and the dii'erence between false and true notches on either of them,by forcing the stump against the tumblers and noting the position of an index attached to the instrument, whatever it may be that retracts or tends to retract the bolt; and I have remedied this defect in this class of locks by combining, with tumblers set or adjusted separately and in succession, a bolt, and a vibrating stump or fence attached thereto, said fence Yacting to stop the motion of' the bolt at one and the same point irrespective of the precise tumbler or precise notch of a tumbler against which the stu mp is forced.
- the bolt is shown at B, and is guided as usual by the gate in the rim and by two pins, a a2.
- the post a is strongly secured to or made in one piece with. the lock-plate A, and is a cylinder with one side flattened. This flattening is merely to prevent the washers 1 2 3 4 from revolving.
- the tumblers D D D free to revolve thereon, and between the tumblers are the washers, the whole pack of washers and tumblers being held in place by a stout washer, H, secured by aspringring, I, taking into agroove on top of the post.
- tumblers are gated or deeply notched, as at d, for the entrance of the stu mp, and have also false notches surrounding them, as at l 2 3', &c., such notches also serving as cogteeth, by means of which each tumbler can be revolved.
- These notches extend all round the tumblers, except at one spot, as atti, where their original rim is left uncut, so as to secure a point of departure from which tocount the position of the stump-notch when the tumblers are revolved.
- the bolt has pivotedI to it at b4 an ordinary guard-tumbler, G, held in abutment against the pin a2, which serves as a stop for this tumbler.
- this tooth' and its shaft are clearly shown in the drawings, and on its shaft are twined a series of grooves whose distance from center to center is the same with that of the tumblers, and into these grooves takes a spring-pin attached to the curb, and clearly shown in Fig. 3.
- This pin permits the key to be shoved out and in within the ease ofthe lock, and serves to determine the position of the tooth, so that the tumbler upon which it is acting may be known.
- the distances between the true notches or gates into which the bolt-stump must enter before the lock can be unlocked and the blank spot on the periphery of the tumblers vary in each tumbler, and the numberof tumblers may vary from twovupward.
- one of the tumblers is to be turned by the revolving tooth operated by the crank until the blank is felt. Vhen the tooth strikes the blank, further revolution in the same direction is impossible. The key is then to be shoved in or pulled out, and another tumbler set in the same way until all the blanks lie over each other. Ihenby acting on each tumbler separately each one is to be revolved by the crank and tooth untilk the gate or true notch comes opposite the stump on the bolt, the necessary amount of revolution being known and depending upon the construction of each tumbler, or,
- each tumbler is moved separately, and when adjusted remains in the position for the stump to enter without being held in place by the key, thus differing from that class of locks in which the tumblers are lifted all at once and held in position bya key or bits while the lock-bolt is being retracted. It will also be observed that a whole revolution of the crank and tooth only turns each tumbler one notch.
- the bolt In locking, the bolt is to be shot, and the tumblers are then, by means of the tooth, to be moved so that their true notches are no longer opposite the stump.
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