Geometrical instruments – Indicator of direction of force traversing natural media – Level or plumb – terrestrial gravitation responsive
Patent
1998-04-17
1999-12-07
Bennett, G. Bradley
Geometrical instruments
Indicator of direction of force traversing natural media
Level or plumb, terrestrial gravitation responsive
33382, 33407, G01C 928
Patent
active
059962380
ABSTRACT:
A right angle level holder includes a right angle level base, and a plurality of thumb screws. The right angle level base has two legs which are disposed 90 degrees apart from one another. Each leg has a slot which receives a straight level. A first side of the slot has an inverted acute angle surface which is structured to retain a first edge of a straight level. The second side of the slot has a raised portion which is high enough for tapping a threaded hole. The thumb screw is threaded in the threaded hole to retain a second edge of a straight level. The thumb screw has a first end which is adapted for turning by finger pressure. The second end of the thumb screw has a swivel tip that is adapted for retaining the second edge of a straight level.
REFERENCES:
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patent: 4501057 (1985-02-01), Palomera
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patent: 5088205 (1992-02-01), Egbert
patent: 5129150 (1992-07-01), Sorensen
patent: 5408752 (1995-04-01), Eadens
Bennett G. Bradley
Ersler Donald J.
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