US1980513A - Puzzle lock - Google Patents

Description

Nov. 13, 1934. L. ZEUMER, GEB. KLEIBR 1,980,513

A PUZZLE Locx Filed Oct. 2, 1930 E? fr Patented Nov. 13, 1934 PATENT OFFICE vPUZZLE Loony Luise Zeumer, geb. Kleiber, Karlsruhe in Baden, Germany, .assignor to Eugene Leuner, Zurich,

Switzerland Application OctoberA 2,

1930, Vserial No. 485,883

In Germany October 14, 1929 3 Claims.

This invention relates to a puzzle lock (keyless safety lock) with two tumblers rotatable around a common axle and adjustable 1by a shiftable turning knob, which lock differs from the known -5 locks of this type through the great simplicity of yits construction and the facility of production in that it has only a single spring and, besides this spring, the turning knob and a few pins, comprises only stamped and partly pressed sheet l metal parts.

The lock is illustrated by way of example in the accompanying drawing in which:- Fig. 1 is a longitudinal section on the broken line I-I of Fig. 2.

Fig. 2 is a top plan View with the cover removed, the lock being in open position.

Fig. 3 is a similar view to Fig. 2, the lock being however in locking position.

On the bottom plate of the lock casing 1 a plate 20. 2 of substantially rectangular shape and shiftable in longitudinal direction is arranged, which carries a latch 3 and a projection 4 and has an elongated hole 5 and two longitudinal slots 6 KFig. 2). The projection 4 and the elongated fhole 5 are situated in the longitudinal axis of the lock, the slots 6 being symmetrical and parallel "thereto, Two circular tumbler discs 7 lie on the plate 2, as also a somewhat smaller intermediate disc 8 and two hook-shaped levers 9, these parts .30.. -lying loosely on one another. The discs 7 have a large circular hole 10 in the centre (Figs. 1 and f2), the disc 8 has a somewhat smaller circular hole 11 and four notches on its circumference. Each of the discs 7 has further a radial rectangu- 35. lar slot 12, which in the position shown in Figs. l and 2 registers with a similar slot 13 in the disc 8 which lies opposite to the projection 4 of the plate 2, and on the outer edge an upwardly pro- ',jecting lug 14 (Figs. 2 and 3) at the side of which ,40 the free end of the lower or upper lever 9 projects. The bottom plate of the casing 1 has four pins l5 which, like the notches of the disc 8, are arranged at the corners of a square, the centre point of which lies in the longitudinal axis of the lock and coincides with that of the discs 7 and 8, 'and which project through the slots 6 and close against the inner edge of the discs 7 through holes 10 therein and the notches in the disc 8 so that they secure the latter against shifting and 50,. turning and the discs 7 only against shifting. One of the two left hand pins 15 constitutes the pivot of the lower lever 9 and the other left hand pin 15 for the upper lever 9, as it projects through a hole in the lever up to the upper side thereof,

K,whereas the two right hand pins 15 project only up to the plane ofthe upper surface of the upper disc 7.

On the cover plate16 ofthe casing 1 the turning knob 17,y shiftable in longitudinal direction, is arranged, which has a collar 18 lying in an elongated hole in the cover plate and carries a pin 19 engaging in the elongated hole 5 in the plate 2; A circular disc 20 having a radial arm 21 (Figs. 2 and 3) is mounted on the pin 19 directly above the upper lever 9, and between this disc and the cover plate 16 a loose square plate 23 is arranged and which is secured against rotation by two projections 22 (Fig. 2) on the under side of the cover plate and having a downwardly projecting lug 24. The bottom plate of the casing l has also two pins 25 and 26 projecting through slots in the plate 2. A coil spring 27 is mounted on the pin 25 having two long arms' lying transversely over the plate 2, the lower of said arms bearing against the latch 3 and the upper on the lug 24 and with its free end on the pin 26, so that this spring tends to hold the plate 2 with the latch 3 and the projection 4 in the extended position shown in Figs. 1 to 3, and the plate 23 and the parts 17, 18, 19 and 20 in the position shown in Figs. 1 and 2, in which positions the plate 2 abuts against the pin 25 and the pin 19 against the right hand end of the elongated hole 5.

When the tumbler discs 7 are in the position shown in Figs. 1 and 2, the knob 17 and therewith also the plate 2 together with the latch 3 through the pin 19 can be pulled back into the position shown in dot dash lines in Figs. 1 and 2, in that the projection 4 can enter into the registering slots 12 and 13 of the discs 7 and 8 situated opposite thereto. In order tosecure the plate 2 with the latch 3 in extended position,

the knob 17 is first turned with the disc 20 so v that its arm 21 comes opposite the lug 24 of the plate 23, which position is indicated by marks on the foot of the knob and on a scale arranged on the cover plate 16. The knob 17 together with the parts 18, 19, 20 and 23 is then pushed to the left, against the action of the spring 27, until the pin 19 abuts against the left hand end oi" the elongated hole 5 (see Fig. 3). Thus this pin forces apart the crossed inner ends of the levers 9 situated in front of it, so that these levers turn and, owing to their outer ends bearing against the lugs 14 of the discs 7, these discs are also rotated from the position shown in Figs. 1 and 2 into that shown in Fig. 3, in which the projection 4 of the plate 2, instead of lying opposite the slots 12, is opposite a portion of the outer edgesr of the. discs 7, so that the return movement of the plate 2 towards the right is prevented by the projection 4 abutting against the edges of the discs.

In order to release the lock, the knob 1'7 pushed back in the solid line intermediate position shown in Figs. 1 and 2, is turned together With the disc rst in one and then in the other direction until the mark applied on the foot of the knob coincides with a certain division line on the scale tted on the cover plate 16. The tumbler .discs '7 and the levers 9 are thus also turned back into the position shown in Figs. 1 and 2 in thatjthe disc 20, by means of its arm 21 bearing against the lugs 14, shifts the discs 7, which in turn shift the levers 9 through the intermediary of said lug thus bringing the projection 4 vopposite the carrying said rotatable shifting knob, two tumbler discs rotatable about said pin, pinsvforming a hubv about which said tumblers rotate, two

hook-shaped levers pivotally mounted on said jshaped levers.

said casing into its locking position. 5

LUISE ZEUMER, GEB. KLEIBER.

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