Patent ID: 7454839

Claim:
A laser unit for providing at least one of a laser level line and a laser plumb line, the laser unit comprising: a housing; a pendulum assembly located within said housing; a laser assembly for providing either a level line or a plumb line, said laser assembly being mounted upon said pendulum assembly such that said laser unit is configured to provide at least one of a level line or a plumb line when said pendulum assembly is in a unlocked mode; and a pendulum locking mechanism for locking said laser assembly into a locked mode in which said laser assembly is locked into a fixed position regardless of the orientation of said laser unit; wherein said pendulum assembly includes: a pendulum bearing that is pivotably attached to a pendulum bearing support assembly; and a pendulum bob mounted below said pendulum bearing; wherein said pendulum locking mechanism includes: a pendulum lock drive arm that includes a pair of L-shaped slots; and a pair of pivotable pendulum locks that each include a pin configured to mate with one of said L-shaped slots.