Patent GB-1035068-A (GB)
Title: Improvements in or relating to combination locks
Inventor: MILLER HARRY CLAYTON
IPC: E05B37/08
Filed: 1964-08-15
Abstract: 1,035,068. Combination locks. SARGENT & GREENLEAF Inc. Aug. 15, 1964, No. 33422/64. Heading E2A A combination lock comprises selectively adjustable, peripherally recessed tumbler wheels 19, 20, 21, a rotatable driving cam 18 for adjusting said tumbler wheels, a bolt 25, a fence lever 26 pivotally connected to said bolt with a nose 34 for engaging the periphery of said driving cam and a radially extending fence 29 transversely overlying the peripheries of said tumbler wheels, said driving cam having a peripheral gate 33 for receiving said nose to permit said fence to enter the tumbler recesses when the latter are adjusted in register therewith, shielding means for preventing entry of said nose 34 into said gate including a reciprocative shielding slide 37 supported on said driving cam for radial movement into and out of a shielding position, a movable actuating member, manipulating means 53 coupled to said actuating member 46 for moving the latter relative to said shielding slide over a pre-selected range of movement and spring means 57 coupled to said actuating member to be actuated by movement of the actuating member to store up energy and release the same to drive said shielding slide to said non-shielding position. In the first embodiment described the combination lock is of the kind disclosed in Specification 651,187 and U.S.A. Specification 2,807,954. The rear face of the driving cam 18 has a pair of guide blocks 35 (Fig. 5, not shown) for supporting a shielding guide 37 the length of which corresponds to the diameter of the driving cam. The slide 37 has a forwardly projecting pin 40 which co-operates with a fly 24 to impart motion thereto when the slide is in the shielding position. The guide blocks 35 also support a second slide 46, the actuating slide, having a straight upper end 48 with a rigid finger 49. Both slides 37, 46 have central slots 41, 50 respectively, the actuating slide also having an opening 51 to receive the nose 52 of a slide actuating cam or tang 53 which is fixed to the inner spindle 54. As an auxiliary knob 55 rotates the tang 53 through the spindle 54, the actuating slide 46 is moved upwardly carrying with it the stud 56 so that as it passes above the stud 42 the force of a spring 57 slides the shielding slide to a non-shielding position (Fig. 2, not shown) which exposes the cam gate 33 to receive the fence lever nose 34. While the dial 15, 16 is manipulated to align the recesses 22 in the tumbler wheels, the slides are in the position shown in Fig. 3, the dial 16 being turned finally to a position in which the finger 49 is aligned with a groove 65 (Fig. 4, not shown) in the rear cover. The shielding slide is then moved as above described and the fence lever 26 is pivoted inwards away from a boss 31, so that further counterclockwise rotation of the dial 16 retracts the bolt, the finger 49 sliding in a further groove 66 provided in the rear cover. In another embodiment the actuating slide slides within the shielding slide itself and has two springs which are received in notches in a projection of the actuating slide, the other ends being mounted on the guide blocks.