Abstract: Permutation and key-operated padlock having a driver tumbler formed integrally with its tumbler post. The tumbler post extends through the top face of the padlock casing and is retained to the dial knob for dialing the tumblers by a spinning operation to form an integral dial knob and tumbler post assembly which cannot be removed from the casing by unauthorized efforts to release the shackle. The permutation mechanism includes the driver tumbler and driven tumblers freely rotatable on the tumbler post and biased into engagement with each other. A spindle for the driven tumblers extends within the tumbler post and the driver and driven tumblers have the usual axially extending driver lugs to rotate said tumblers upon movement of the driver tumblers to the correct combination numbers and align radially extending slots in the tumblers to receive a tongue from a rocker carrying a latch bolt and accommodate release movement of said rocker and release of the latch bolt from the shackle.

Abstract: Combination-controlled and key-operated padlock constructed to be partially assembled and stocked. When the lock is to be shipped, a desired key barrel and cylinder subassembly may be selected and assembled to the padlock without any alteration to the padlock or its casing. A two-piece inner back plate is provided, a larger part of which covers the combination tumblers and retains the tumbler post in position and forms a mounting for a pivot shaft for the rocker for the tumbler post. The smaller part of the back plate forms a mounting for a key cylinder subassembly including a key barrel within the key cylinder, a transmission plate movably mounted in the key cylinder and connected with the key barrel to be pivoted about the axis of the key barrel upon turning of the key. The smaller back plate is secured to a lug extending axially of a fin extending radially of the key cylinder so the partial back plate, key cylinder and transmission plate may be assembled to the lock in a simplified operation.