Patent ID: 6449856
Filing Date: 2002-09-17
Classification: G01C,Y10S

Abstract:
A laser plumbing device for use in a plumbing operation of arranging a long member in a substantially vertical position and plumbing the arranged long member, comprising:a laser beam emitting device; a supporting device for supporting said laser beam emitting device arranged in a position for emitting a laser beam vertically downward, and allowing swinging movements of said laser beam emitting device in a first direction crossing a laser beam emitting direction and a second direction crossing the laser beam emitting direction and being perpendicular to said first direction; a two-direction drive device for swinging said laser beam emitting device in said first and second directions; an inclination angle detecting device for detecting an inclination angle of said laser beam emitting direction with respect to a vertical axis; and a controller for controlling the position of said laser beam emitting device by said two-direction drive device so as to change said laser beam emitting direction toward the vertical axis based on a signal output by said inclination angle detecting device; wherein said supporting device of said laser beam emitting device has a leveling base carrying said laser beam emitting device; a spherical member provided on said leveling base, projected upward and having a spherical or nearly spherical top surface; a spherical surface contact member being in contact with the top surface of said spherical member and located above said leveling base; and a spring elastically pushing and supporting said leveling base upward for keeping the top surface of said spherical member in contact with said spherical surface contact member and allowing swinging movements of said leveling base around the contact point between said spherical member and said spherical surface contact member in said first and second directions.