Geometrical instruments – Indicator of direction of force traversing natural media – Level or plumb – terrestrial gravitation responsive
Patent
1993-10-18
1995-02-14
Wirthlin, Alvin
Geometrical instruments
Indicator of direction of force traversing natural media
Level or plumb, terrestrial gravitation responsive
33374, 206372, G01C 924, B65D 8500
Patent
active
053883381
ABSTRACT:
An interlocking screed level and method comprising a rectangularly-shaped screed section having a top surface, a bottom surface, a front surface, a back surface, and a first and second end. A rectangular preform extension member of a lesser dimension than the exterior boundary of the screed section extends axially from the first end of the screed section. A rectangular joint recess extends axially from the exterior of the second end of the screed section and has a depth commensurate with the length of the extension member with a boundary of minimally less than the extension member for receiving extension members of adjoining screed sections. A first lock component is located at the first end of the screed section and a second lock component is located at the second end of the screed section. A bottom surface for planing concrete surfaces is provided. A level gage is provided in the top surface for ensuring levelness of the concrete surface.
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patent: 4515268 (1985-05-01), Telly
patent: 5119936 (1992-06-01), Sevey
Smith Hugh E.
Wirthlin Alvin
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