Optics: measuring and testing – Fiducial instruments – Artificial reference
Patent
1997-01-06
1998-05-19
Font, Frank G.
Optics: measuring and testing
Fiducial instruments
Artificial reference
33227, 33286, G01C 912
Patent
active
057542872
ABSTRACT:
A plumb apparatus is described in two embodiments having common operational and construction features. In a first embodiment, a beam projector is mounted within an upper end of an elongate pipe which is slidingly fit in an angularly pivotable mounting. The lower end of the pipe is formed with a point adapted to contact a target point on a supporting surface when a base in which the angularly pivotable mounting is held is placed on the surface. A bi-axial level is attached to the upper end of the pipe to ascertain vertical orientation of the pipe, which orientation is maintained by the weight of the base structure which is in contact with the supporting surface. The beam projector is activated to project a beam to a target point on the ceiling above. According to the second preferred embodiment, a beam projector is mounted into an upper end of a pipe, the lower end of which is mounted into a ball. The ball is placed into a cup which is engaged by a clamp cover having an opening through which the pipe extends. A bi-axial level is attached to the upper end of the pipe to ascertain vertical orientation of the pipe, which orientation is maintained by screwing the clamp cover to prevent further pivoting of the ball.
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Font Frank G.
Stafira Michael P.
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