Patent GB-190913310-A (GB)
Title: Improvements in and relating to Combination or Keyless Locks.
Inventor: FARRAND OLIVER MOREHOUSE
IPC: E05B37/00
Filed: 1909-06-07
Granted: 1910-03-31
Abstract: 13,310. Farrand, O. M. June 7. Locks, permutation.-In a permutation lock which is operable by successive rotary and longitudinal motions of the knob, the spriog bolt A is actuated by a shoulder E on a disk N engaging a projection D on the bolt. The disk W is secured to the spindle of the outside knob, and is adapted for slight longitudinal motion in the casing as well as a rotary one. The disk carries a series of pins 0, which are adjustably secured in position so that they can be caused to protrude from either face of the disk. The edge of the disk travels between parallel arms P, P' of a lever pivoted on the pin Q. The distance between the two arms is just greater than the length of the pins, and a protruding pin would, if extended over one of the arms, come into engagement with a curved portion R of the arm and depress the lever so that the end T would lie directly in the path of a pin S on the disk W and thereby prevent any further motion of the disk to withdraw the bolt. If, however, when a pin comes over one of the arms P, P', the koob be given a longitudinal movement, the pin can be caused to lie wholly between the two arms, and the disk can thus be turned without depressing the lever. In Fig. 1, the two pins nearest the ends T of the lever are shown protruding from the further side of the disk, the next pin protrudes on the near side, the next three on the further side, and the last four on the near side. The operation of the knob will therefore be an outward longitudinal movement, and then successive rotary movements of 2, 1, 3, and 4 stops with a longitudinal movement after each rotary movement, a spring f being provided to engage corrugations e in the edge of the disk to determine the extent of each rotation. If the knob has been turned successively, the pin S will engage the underside of the arms P, P', and thereby raise the lever and at the same time release a locking-lever H from the bolt A, a pin K on the lever H engaging the arm P, and the bolt will be withdrawn. The bolt can be withdrawn from the inside by means of a follower r on the inside spindle, one arm M of which releases the locking-lever H, and the other arm G engages a projection F on the bolt. The lever P, P' is under the control of a springs, but is retained in the position into which it is placed by means of a blade spring l, Fig. 4, on the underside of the arm P' engaging depressions in the casing. To change the combination, the old combination is set to enable the lever P, P' to be turned on its pivot by the pin S, and to release thereby a pin Y on a shaft W, extending through the casing, from a projecting ledge X on the arm P. The shaft W is then turned by means of a screwdriver &c. until a spring arm b, Fig. 2, thereon engages a hole 2 in the edge plate of the casing ; in this position the pin Y is below the ledge X. The disk N is now returned to its original position, and the lever P is turned still further by means of an arm V on the shaft W engaging the inclined end Z of the lever, the shaft W being turned until the spring arm b engages the hole 3. In this position, the arms P, P<1> are immediately in the path of the pins 0 as shown in Fig. 10, and the latter can successively be brought between the two arms, and placed in either of the two positions in the disk N by moving the knob longitudinally. The outside and inside knobs are connected together by a spindle o, Fig. 6, which gives them the same longitudinal movement, but allows them to rotate independently of one another. The inside follower r cannot move longitudinally and is adjustably secured to the inside knob by a toothed connexion. In Fig. 16 is shown a bolt moved in both directions by the disk N. In this case a pin z on the bolt engages a cam slot in the disk, the slot being concentric with the disk for a certain distance to enable the permutation mechanism to come into use. In changing the combination in this form, the lever P, P<1> is moved to the correct position by means of the pivot pin Q, which can be turned by a screwdriver.