Geometrical instruments – Indicator of direction of force traversing natural media – Level or plumb – terrestrial gravitation responsive
Patent
1998-03-26
2000-01-11
Fulton, Christopher W.
Geometrical instruments
Indicator of direction of force traversing natural media
Level or plumb, terrestrial gravitation responsive
33227, 33281, 33451, 33DIG21, G01C 900, G01C 1502
Patent
active
060122293
ABSTRACT:
A combined leveling device and laser pointer includes a support body which holds a bubble tube and a rotary seat. The rotary seat extends from a front face to a rear face of the support body and has a through-hole which extends from the front face to the rear face and which includes a tapered clamping hole section that is tapered in a direction from the rear face to the front face. The rotary seat is graduated adjacent to the front face, and a clamp is movably provided in the through-hole. The clamp has a plurality of resilient clamp members which are resiliently movable toward or away from one another when the clamp moves into or outward from the tapered clamping hole section. A detachable laser light source unit is insertable into the clamp from the rear face so as to be clamped removably by the resilient clamp members. A hologram is mounted to the rotary seat adjacent to the front face to produce a one-dimensional linear projection image from the laser light source unit. After the laser light source unit is inserted into the clamp, the clamp is fixed in the tapered clamping hole section, thereby firmly holding the laser light source unit.
REFERENCES:
patent: 3894342 (1975-07-01), Goode
patent: 5519942 (1996-05-01), Webb
patent: 5531031 (1996-07-01), Green
patent: 5842282 (1998-12-01), Ting
patent: 5864956 (1999-02-01), Dong
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