Combination lock

607,278. Locks. YALE & TOWNE MANUFACTURING CO. Aug. 14, 1944, No. 15474. Convention date, Sept. 16, 1943. [Class 44] In a lock of the kind mounted in a housing to be secured to a locker &c. and including a locking bolt adapted to lock the main latch bolt of the locker &c, in which the locking bolt is mounted for movement on the lock housing in releasing and locking directions with the movement of the main bolt, the locking bolt is adapted to be released under the control of a series of tumblers having gatings by which they are adapted to control the movements of a fence, and the movement of the bolt in releasing direction is normally prevented by a pivotallymounted locking member which is adapted to be made ineffective when the fence moves into the gatings of the tumblers. The general arrangement is shown in Figs. 1 and 3. The locker 10 has the usual bolt 11, with a handle 12 and lugs 13, which are adapted to slide behind ears 14 on striking plates 15 on the locker frame. The door is released by upward movement of the bolt 11, and the bolt is held up by engagement of a spring 19 in a notch 20 on the bolt. On closing the door, the spring 19 is disengaged by contact with the striking plate 15, allowing the bolt to drop. The locking bolt 22 moves vertically, but when locked, prevents movement of the bolt 11 by contact with the arm 24 thereon, and is provided with lugs 23 on each side so as to be applicable to either right or left opening doors. When unlocked, bolt 22 is raised by bolt 11 on turning the handle 12. In a modification, the bolt 11 has arms engaging both upper and lower surfaces of the bolt lug 23, and bolt 11 is not provided with a handle, the operating knob of the lock serving to operate the bolt 11. The lock, Figs. 7, 9, 14, comprises a housing 26 with track ways 27 at each side accommodating vertical guides 28 on the bolt 22. Springs 29 bear on shoulders 30 on the bolt 22 and on the heads of guide pins 32, which bear partly against shoulders 33 on the bolt and partly against shoulders 34 on the housing 26, thus tending to bring the bolt to the central position. Rotating within an opening 35 in the housing is a tumbler casing 36, Figs. 19, 20, carrying two pins 37, 38. Within casing 36 a series of tumblers 40 are. mounted to rotate on a pin 39. These are actuated through fingers on a series of operating discs 42 in the usual manner. The outermost tumbler 44 is formed with a clutch disc 45 having internal ratchet teeth 46. The fence 48, Fig. 18,