US 4,744,152 AGranted

Tool for measuring angles on various articles

OwnerDaniel Roach, George Spectorinventors

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Abstract

A protractor quadrant tool accessory is provided and consists of two arms attached pivotally together at one end, degree calibrations so that the angle between the arms is readily read and a locking device whereby the angle between the arms can be maintained fixed so that the protractor quadrant tool accessory can be used by a machinest and carpenter to measure angles on various articles. In a modification stud guides attached to outer parallel straight edges of the arms can stabilize the tool accessory when measuring the stairways stud angles and the like, used as an isometric center finder and making equal and opposite converse lines upon a stud. In still another modification an adjustable trimitre is slideably locked upon one arm so as to stabilize the tool accessory when measuring the stud angles and the like to be cut.

Claims3

Dependent claims

A protractor quadrant tool accessory for measuring angles on various articles, which comprises:

(a) first and second similar flat arms, each of said arms having inner and outer parallel straight edges, said first arm having a circular lower hub at distal end and said second arm having a similar upper hub at distal end, wherein said hubs are concentric and having spaced parallel outer faces forming coplanar extensions of said arms;
(b) means for securing said hubs pivotally;
(c) calibrated indicia on said hubs for measuring said angles further comprising pairs of guides, each of which includes:
(a) a cylindrical housing with top and bottom surfaces having a slot parallel to said surfaces to fit upon said outer parallel straight edges;
and
(b) a securement bolt threaded into said top to extend transversely into said slot for securing said pairs of guides on said outer parallel straight edges so as to contact the article being measured to stabilize said tool accessory when measuring said angle and the like.

3 more elements

Dependencies are inferred from the claim text.