Self-leveling construction alignment laser
First Claim
1. In a system for projecting and utilizing a light beam as a reference line for construction purposes comprising:
- a rectilinear rod supported for rotation about its major rectilinear axis,a line-of-sight device,a light beam projecting device enclosed in a housing,both of said sighting and projecting devices fixed to said rod and spaced apart thereon in a direction parallel to said rod axis, said devices being oriented relative to said rod axis with the line-of-sight of said line-of-sight device and with the center line of the light beam both directed generally transversely to said rod axis and in a common plane parallel to said axis, wherein rotary adjustment of said rod about said axis to bring the line-of-sight device into alignment with a predetermined point causes the projected beam of light to be positioned with its center line in a plane common to said point and to the line-of-sight of said line-of-sight device,means for angularly adjusting said devices relative to each other in a plane parallel to said rod axis including a clamp assembly removably attached to said light beam projecting device having an opening to accept said rectilinear rod, a hook plate adapted to retain said rod within said clamp assembly, a pivotable wall in said opening for angularly adjusting said light projecting device relative to the rectilinear rod in a plane parallel to said rod axis, anda light compensator means mounted within said light projection device for intercepting said beam of light and automatically correcting slight deviations of the light beam from true horizontal, said compensator having a liquid-air interface always parallel to the true horizontal to provide compensation.
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Accused Products
Abstract
The specification discloses an improved system for projecting and utilizing a light beam as a reference line for construction purposes. The system includes a light beam projection device mounted in a housing. A light path compensator is positioned within the housing and intercepts the beam of light emitted by the light beam projecting device and automatically corrects slight deviations of the light beam from true horizontal. A vertically adjustable leg is attached to the front end of the housing and a horizontally pivotable leg is attached to each side of the housing near the rear end of the housing to enable leveling and centering of the housing in a conduit or positioning and leveling on any surface. Structure is controllable from the rear of the housing to deflect the light beam in a vertical plane to vary the grade of the beam projected by the device. An indicator, readable from the rear of the housing, is provided for indicating the grade at which the light beam is projected. Structure is connected between the support legs and housing for rotating the housing in a horizontal plane to provide azimuthal adjustment of the light beam projected therefrom.
30 Citations
7 Claims
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1. In a system for projecting and utilizing a light beam as a reference line for construction purposes comprising:
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a rectilinear rod supported for rotation about its major rectilinear axis, a line-of-sight device, a light beam projecting device enclosed in a housing, both of said sighting and projecting devices fixed to said rod and spaced apart thereon in a direction parallel to said rod axis, said devices being oriented relative to said rod axis with the line-of-sight of said line-of-sight device and with the center line of the light beam both directed generally transversely to said rod axis and in a common plane parallel to said axis, wherein rotary adjustment of said rod about said axis to bring the line-of-sight device into alignment with a predetermined point causes the projected beam of light to be positioned with its center line in a plane common to said point and to the line-of-sight of said line-of-sight device, means for angularly adjusting said devices relative to each other in a plane parallel to said rod axis including a clamp assembly removably attached to said light beam projecting device having an opening to accept said rectilinear rod, a hook plate adapted to retain said rod within said clamp assembly, a pivotable wall in said opening for angularly adjusting said light projecting device relative to the rectilinear rod in a plane parallel to said rod axis, and a light compensator means mounted within said light projection device for intercepting said beam of light and automatically correcting slight deviations of the light beam from true horizontal, said compensator having a liquid-air interface always parallel to the true horizontal to provide compensation. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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Specification