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Publication numberUS1677396 A
Publication typeGrant
Publication dateJul 17, 1928
Filing dateJun 7, 1926
Priority dateJun 7, 1926
Publication numberUS 1677396 A, US 1677396A, US-A-1677396, US1677396 A, US1677396A
InventorsClifford G Mickel
Original AssigneeClifford G Mickel
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
US 1677396 A
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Description  (OCR text may contain errors)

July 17, 1928. 1,677,396 c. G. MICKEL INVENTOR. CL/'FFURD M/cmfz.


. having -therein an opening Patented July 17, 1928.

UNiran STATES 1,677,396 Parar oFFicE.



Application led .'iune t?, 1928. Serial No. 114,17?.

use. A still further object of my invention is to rovide a protractor within a triangle a complete visibility with isolated center and a bevelled edge for accurate reading.

A still further object of my invention is to rovide a beam having apertures longitudinally spaced thereon adaptable for pencil or crayon in the process of drawing circles.

These and other objects will hereinafter be more fully expxlained.

Referring to t e drawings:

Fig. 1 is a plan view of the triangle.

Figure 2 is a cross section taken on line 2-2 in Fig. l.

The instrument herein disclosed consists of a triangle 1 having centrally positioned 2, said opening being an arc and having degree graduations 3 around the circle thereof functioningl as a protractor of 180 degrees. The perip ery of the arc being bevelled as at A so that the aduations extend to close contact with t e surface on which the triangle is placed.

Spaced from the base or diametrical axis of the protractor is one wall of the opening as at B. Laterally extending therefrom and centrally positioned thereon is a tongue 4 having an aperture 5 therein, the center of which is on the base line of the protractor. The said a erture being the pivot point o f a beam 6, t e said beam adaptedl to revolve being connected thereto by an eyelet 7 That end of the beam having parallel edges asat C has a plurality of apertures 8 adapted to receive the end of a crayon as centering means when drawings. circ e; the opposite end of the beam bein pointed so that one edge as at D is radial y positioned with the graduations of the protractor, and in ali ment with said edge is a line E on oppositeiiides of the aperture and diametrically positioned therewith. Similar lines F are transversely positioned to the first said lines, the said lines function as cross hairs when placing the center of the protractor on a given point which is visible through the eyelet 7. The pointed end ofthe beam has a plurality of staggeredfiapertures 9 to receive the point of a pencil when making circles of different diameters. Note that the beam, will describe an entire circle as p artl indicated by dotted line G; one position eing shown by dotted line H.

Measurement graduations may be placed along the angles of the triangles as shown at l0. l do' not confine the measurements to the hypotenuse angle as shown in the drawings as right angles. Neither do I confine the grad they may be placed along the nations to any particular system, as the metric system may be applied on one -or more of the angles as well as the United States standard system.

It will be understood that the instrument may be applied on blackboards as well as working on a drawing table or desk and will be very useful to professional draftsmen or students, as the instrument may beused as a triangle or a protractor and circles of dierent diameters may be made within the scope vof the instrument When an ordinary compass is not available.

To establish angles of different degreesl from a given base line, the base of the protractor will be placed registering with the line and if a perpendicular line is to be considered in connection therewith the intersection of the lines are visible through the eyelet at which time the vertical cross hair will assist in the alignment. It beingunderstood that the edge D of the beam will register with 180 de rees and the opening extending belowlSO egrees provides an unobstructed view of the base line, therefore the instrument can be set more accurately.

Such modifications may be employed as lie within the scope of the appended claims.

Having thus described my invention, what I claim as new and desire to secure by Letters Patent is 1. In a triangle, a draftin instrument having an arcuate opening, a eam having a laterally extending member provided with an aperture, the center of the aperture being in alignment with the straight edge of one end of the beam, there being a bevel on the peripheral edge of the arcuate opening, said bevel having degree graduations thereon to .provide a protractor the aligned ed e of the beam with the said aperture comprising radial means for findin the degree of an angle, there being cross lines on the laterally extending member of the beam,

said lines being transversely positioned to each other adjacent the pivot and functioning as a cross hair for centering the aperture on a given point when the straight side of the beam is rocked to alignment with its respective plane of the triangle.'

2. In a drafting instrument. a triangular member having an arcuate opening therein, one edge of the opening being beveled, there being graduations on the bevel spaced as degrees and functioning as a protractor, a beam having n, lateral extension apertured for a pivot point, said extension being centrally positioned on the beam, edges ofthe beam on one side of the pivot point being parallel CLIFFORD e. monat..

Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US2482051 *Apr 16, 1945Sep 13, 1949Yingling Ralph SRotary checking fixture
US8025667 *Sep 27, 2007Sep 27, 2011Depuy Products, Inc.Apparatus for measuring an angle of a guide wire relative to a bone
U.S. Classification33/424
Cooperative ClassificationB43L7/12