Protractor

Details Protractor Protractor

1992-05-22

1993-03-09

Haroian, Harry N.

Geometrical instruments

Indicator of direction of force traversing natural media

Level or plumb, terrestrial gravitation responsive

G01C 912

Patent

active

051917149

ABSTRACT:
A protractor has a main body, a frame and an indicating means. The main body comprises a vertically arranged flat board provided with two pressing edges attached integrally and respectively to upper and lower sides thereof and with a slot. Each of the pressing edges has a plane portion facing outwardly. The frame is disposed inside the slot and is provided with two positioning arms and an arcuate portion bridging the two positioning arms and having scales marked thereon. The indicating means has a shaft base mounted on the frame and a pointer mounted pivotally on a shaft mounted on the shaft base. The pointer has one end extending to reach the scales and other end provided with a balancing weight serving to keep the pointer to remain perpendicular to a horizontal surface, against which an object intended to be measured is set, at the time when the plane portion of the main body is placed on the measured surface of the object.

REFERENCES:
patent: 1250340 (1917-12-01), Nordling
patent: 1495629 (1924-05-01), Arthur
patent: 2704405 (1955-03-01), Kupchak

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