Geometrical instruments – Straight-line light ray type – Vertical angle
Patent
1998-01-15
2000-08-15
Hirshfeld, Andrew H.
Geometrical instruments
Straight-line light ray type
Vertical angle
33281, 33285, 33DIG21, G01C 1510
Patent
active
061017280
ABSTRACT:
A plumb system for construction projects having a laser module embedded within includes a spring or the like device acting as a connecting device to a tripod or the like apparatus for projecting a vertical laser beam to a vertical end point, from the floor to a certain top point. Conversely, a spring or the like device mounted to the opposite end of the laser module of the plumb can be mounted to a certain high point for projecting a top to bottom laser beam for determining an end point at the floor. An optional horizontal base designed to horizontally receive the plumb for projecting a horizontal laser beam. A horizontal level indicator mounted onto the horizontal base can ensure a true horizontal plane. An optional self standing horizontal block can be used to determine the intermediate points of the horizontal laser beam. In addition, it can be used as a fixed point on a vertical surface by positioning the laser beam to lock on to it, the other horizontal point in line with the fixed point can be determined.
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patent: 5912733 (1999-06-01), Dunlop et al.
Hirshfeld Andrew H.
Smith R A
Wu Charles C. H.
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