Patent ID: 8365560

Claim:
A key mechanism for locking and unlocking a cylinder of a bolt lock of the type having tumblers, the key mechanism comprising: a key mounting bracket for grasping by a person using said key mechanism; a key blade attached to said mounting bracket, said key blade having notches which, together with the tumblers of the cylinder bolt lock, provide a unique combination for opening the cylinder bolt lock; said key mechanism having a slot that can be opened and closed by manipulation of said key mechanism so that a respective tumbler of the cylinder bolt lock can fall into said slot when open, and said tumbler can be lifted from said slot during closing of said slot; and said key mechanism constructed to be insertable into the cylinder bolt lock to a first position wherein the cylinder bolt lock is operable to be locked and unlocked, and insertable to a second position wherein a tumbler of the cylinder bolt lock enters into the open slot in said key mechanism, thereby preventing the key from being removed from the cylinder bolt lock.