Geometrical instruments – Indicator of direction of force traversing natural media – Level or plumb – terrestrial gravitation responsive
Patent
1977-02-01
1978-01-17
Phillips, Charles E.
Geometrical instruments
Indicator of direction of force traversing natural media
Level or plumb, terrestrial gravitation responsive
G01C 928
Patent
active
040683869
ABSTRACT:
A line level made of two substantially identical halves molded from thermoplastic material. Each half has an internal surface in the shape of a part of a cylinder which co-operates with a like surface on the other half to receive an end of a level vial. The ends of each half are rectangular and a cylindrical level vial is sandwiched between the halves with its ends resting on the internal cylindrical surfaces. Each half has an outer rectangular surface and a pintle extending inwardly on one end and a hollow boss on the other end which receives the pintle on the other half. An energy director is formed on the one half on the edges that engage the other part for ultrasonically welding the parts together.
REFERENCES:
patent: 2014709 (1935-09-01), Volz
patent: 3878617 (1975-04-01), West et al.
Bronson Sonic Power Co., Ultrasonic News, July 1972.
Bronson Sonic Power Co., Ultrasonic News, Feb. 1973.
Lovercheck Charles L.
Phillips Charles E.
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