Patent ID: 8201340
Filing Date: 2012-06-19
Classification: G01C

Abstract:
1. A measuring staff for use with a laser leveling system including a laser detector for detecting a laser beam, said staff comprising an upper section having a first elongated member and a second elongated member extendable and retractable relative to said first elongated member, means for urging said second elongated member towards an extended position relative to said first elongated member and opposing movement of said second elongated member to a retracted position relative to said first elongated member, means for selectively locking said first member to said second member, said laser detector being adapted to be located along said first member and fixed thereto in a position aligned in use with said laser beam to define a datum level, a graduated scale on said first member and extending longitudinally there along, indicating means movable with said second member and adapted to cooperate with said graduated scale whereby to provide, upon extension or retraction of said second elongated member relative to said first elongated member, measurements on said graduated scale of levels above or below said datum level, and a lower extension section extendable from and selectively lockable to said upper section, said lower extension section including a scale for indicating the extension of said lower extension section relative to said upper section .