Geometrical instruments – Indicator of direction of force traversing natural media – Level or plumb – terrestrial gravitation responsive
Patent
1987-08-04
1989-05-16
Haroian, Harry N.
Geometrical instruments
Indicator of direction of force traversing natural media
Level or plumb, terrestrial gravitation responsive
33381, G01C 916
Patent
active
048296767
ABSTRACT:
A level indicating device comprising a level having attached thereto a pair of detachable securing clips whereby the level indicating device can be maintained mounted flush with a structural member in any spatial orientation without further manual manipulation. The level has clip receiving slots formed in the opposed ends thereof adapted for force-fit reception of the detachable securing clips. The detachable securing clips have mirror-image symmetry and comprise a transverse segment adapted to be force fit inserted into the clip receiving slots, a pair of opposed leg segments extending from opposed ends of the transverse segment for elastically engaging the outer peripheral surface of the structural member to maintain the level indicating device flush with the structural member, and curved end segments terminating the opposed leg segments. The detachable securing clips may be formed in cross-sectional configurations which are compatible for elastically engaging the periphery of structural members of a wide variety of shapes such as pipes and construction-type beams. The length of the opposed leg segments may be varied to form a set of detachable securing clips which can elastically engage structural members having a wide range of ODs or outer dimensions or configurations. The level further includes at least one level indicating means for determining the spatial orientation of the structural member. The level indicating means comprises a liquid filled glass tube having a movable reference mark disposed therein and a plurality of visually perceptible gradations superimposed on the outer surface thereof. Each pair of adjacent gradations defines a field therebetween which represents a predetermined pitch rate.
REFERENCES:
patent: 1940808 (1933-12-01), Linsert
patent: 3707772 (1973-01-01), Cutter
patent: 3844459 (1974-10-01), Chambers
patent: 4290207 (1981-09-01), Browning et al.
patent: 4295279 (1981-10-01), Sienknecht
patent: 4419833 (1983-12-01), Wright
patent: 4501057 (1985-02-01), Palomera
patent: 4589213 (1986-05-01), Woodward
patent: 4593475 (1986-06-01), Mayes
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