Abstract

This invention relates to sequential locking apparatus used to lock, for example a door which has an actuating handle and an associated bolt opening mechanism. The apparatus has a lock release arm, a pin and barrel associated with the lock release arm and acode entry mechanism which collectively control whether the lock can be unlocked by a user. The code entry mechanism comprises a rotatable shaft, an obstruction portion provided on the rotatable shaft for selective engagement with a portion of the lock release arm and a series of clutch mechanisms provided on the rotatable shaft. Each clutch mechanism has drive and driven components and an actuation portion communicable with an associated entry button such that pressing the associated entry button selectively results in rotation of the rotatable shaft to cause actuation of the lock release arm. This arrangement only allows the locking apparatus to be unlocked when the entry code is entered in sequence.

IPC Classes  ?

• E05B 37/16 - Permutation locksPuzzle locks with two or more push or pull knobs, slides, or the like
• E05B 13/00 - Devices preventing the key or the handle or both from being used