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Publication numberUS1778922 A
Publication typeGrant
Publication dateOct 21, 1930
Filing dateMar 17, 1927
Priority dateMar 17, 1927
Publication numberUS 1778922 A, US 1778922A, US-A-1778922, US1778922 A, US1778922A
InventorsCharles F Lepper, Robert W Tait
Original AssigneeCharles F Lepper, Robert W Tait
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
US 1778922 A
Abstract  available in
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Claims  available in
Description  (OCR text may contain errors)

Oct 21,1930. R. w. 1- srm. 1,778,922

SQUARE Filed March 17, 1927 jig -1. 7 r


LEPPEP Patented Oct. 21, 1930 ROBERT w. TAIT, or MYSTIC, AND'CHARLES r. LEPPER. or cE TEiivILLn, Iowa-j $VQUARE.

Applicationfile d March 1?, i927. seri inb, i7e, p74.'

Thisinvention relates to tools, and its embo-diment may best be set forth'in the wellknown steel square used inconnection with the' laying out of angles or the determining 'ofrniter -cuts for regular polygons.

' Theprimary-object of this invention is the provision of a square 'having'degree designations associatedwith the indications in terms of inches'which'are ordinarily made ,a

part of the square. 7 7

Another object of the present invention is to provide" a 7 square having an auxiliary designation associated with each indication in terms of inches,'which auxiliary designationiscomputed from a central point found by projecting intersecting lines from a predetermined point along each blade of the square.

A. yet further object of'the instant inven tion is the provision of a tool having auxiliary designations associated with the'stand; ard indications which will permit the computing of a miter cut for a regular polygon without having toresort to involved computations.

Minor obj ects of the invention and specific details of construction Willappear during the course of the detailed specification referring to the accompanying drawing, in which Figure 1- is a perspectiveview of a square made in accordance with this invention.

Fig. 2 is a diagrammatical view of an"L square showing one method of reaching the proper degree designation tobe associated with each graduation thereon in terms of inches.

Fig. 3 is a diagrammatical face view of the square made 1n accordance with tlllS lnvention being applied to work, and, f

' Fig. l is an enlarged fragmentary'view of the face of a square made in accordance with square which joins the shorter blade 6 at oneend of the heel of the square. The two blades 5 and6 extend perpendicularly from each other and each has graduation marks? engraved or otherwise imprinted on characters refer to like theface thereof adj'acent'thetwo edges i :alsoadj ac'ent the center of said faces.

In applying the improvement toan ordi-' nary square, the inch graduations: on the same are used iniconjunction with the added degree indications. However, this is only a matter of convenience, and the" invention may beappliedto a square in any-suitable. manner; according to the wishes of the man'u-.

facturer or risen: In the instance illustrated in the accompanying drawing, the auxiliary f designations are associated withthe graduations along the outer edge or each blade5 and 6. Degree designations 8 are applied to theface of the square adjacent each indicator '5 maybe set downasifollows; r p I Take,for-eramp'1e,itheinch indicator F512 at theoute'rxedgeof each blade5 and 6 're-I 7 9 and the arriving at the proper designation spe'ctivelyfelntend or PlOjQOiQfl "line 10. perpendicul'arly therefrom to a point 13 where V e the two intersect andthere establish a central' pointior describing an "arc 14:. The next step may be to divide'the arc mime degrees, rininutes and econd determine the degree line-intersecting the outer edge of the blades 5 and 6 and" eachf-inc'h graduation v 'Iiiark'therealong'and then mark' the proper" l associateddegree designation on theface of the blade adjacent the inch graduation?- and indicator"9. 'In'thisi e'Xample,="since by construction' the angle included between thelines 10 is 'degrees, and also since the apex of the scpiare bisects the arc of the circle sub "tended by. this 90 degree angle, thereforefthe twelve inch indicator on each blade 5 and 6 respectively is on the45' degree line extending from point-13 to are :14. In'm'a-rkingwsmaller or larger squares, this predetermined point mayibe-closer-or farther from the meet-"3 -ingt.en'ds of the two blades; 5 {i 4 Flg i i lustrates one extremely simple m n er O usinga square made in accordance with thisiinvention. The carpenter inlthis instancefdesires to form substantially a 60 5 9" 17, angle when'he cuts the board 15'. in 1 two without alarge amount of computing orfigurin'g." In this instance,sincea 45angle registers with the twelve inch graduationof each blade 5 and 6 respectively, audit is greater or'lessthan4 -degrees. 7

modifications desired to illustrate a use within the radius of 45and45 or the portion of the square between lines 10 asindicatedin Fig. 2, the

6059 17 angledesire'd tobe reached. may

be quickly found by placing blade 5 on board with its twelve inch graduation at the lower edge of theboard. WVith this point in I placegblade 6 is swung around to position the seven inch graduation at the lower "edge 'of boardl 5. The square is; now in the rela tive'p'o'sitionw ith respectto board 15 shown in Fig. 3. :In this position, the line 16- may be drawn acrossthe board. It will be 'at'th-e' angle desired. 'Atbladefi, theangle of, 60? a. h 59.,l7 is presented; at l'al adeb', the comple 5 ment of'that angle 99 43 is found. I

. Becauseof the relationship oftheiinch graduatiohs 7 andthe degree designations 8,

the equation 7 isto 12 as 12 is to 2l' is presented. By glancing at the degree designations associated withthese' figures on the novelly constructed'tool', it will be found that the degree difference betweenlthe associa ted designations at the 7. inch and 12inch graduation (blade 6) is 15 degrees, The. angle desired is 60, 59 ;17 and the inch, graduation at. the designation reached when p 15 issubtracted therefrom (4:5 degrees) is the twelve inch graduation (blade or that properly placedat thelower edge of the board as above set forth and, shown inFig. 3.

1 An instance of arriving ata 60 '59- 17 cutwhen departing from the radius ,of,

i and:.45 is si1nple,inthat the designation closest to 597 17 'is located on the face of blade 5 As shown, 'thisrdesignationis at the twenty-o1ie inch indicaton; With this point place at the lower edge of theboard, the other I blade .6[ of the square is swung V around to a place where the; forty-f ve de-' gree designation is also at the lower edge of the board 15. Inthisposition, a line may be drawn across theboard along the edge of blade 6. This line will be at the desired angle,

This principle. of operation may be deductedfroin the above examples. ,To obtain ,7 aline for a cross cut of any desiredangle, get" 'thepoint on one of theblades at its outer edge which registers with thedegree of the angle of the cut desired, then get thel5-v degree point on the outer edge of the other blade. Place these two points on the same edgeofthe board to be marked, and; the angle made by the second mentioned blade with 7 theboard W111 be are desired' angle. This is is claimed as newand. desired from the heel of the square formantiatefs'eeang lines drawn-perpendicnlarly to each blade at the same distance 2. An Lsquareoffthe kind'describedmom prising afp'air jo'f blades extending perpena s y; ro i each "ot yea 'h p .sa

blades having .graduations: in inches rn arked a n e Outr e -t e a dd r e; d na i n s i t d w h, chi she ad ia ion, both of said; rdegree and inch designations s aa t e (heel 'Q s id sq are-a a Zero point, thesaid degreedesignationsbeing computed and set down aloiig-jthe outer straight V edges i? d S u re by' i eieet ne.redi lines from a center. pointthrough each inch graduation, sa d polnt, be ng. determined by the intersecting of aperpendicular line drawn through, inch .graduations "equidistant from the zero point on each blade;

In testimony whereof we hereunto our signatures. 4 a

- ROBERT W. TAITL true whether the angle'to be obtained is It isunderstoodthat many in' inaking a'tool accordance with this invention maybe followed, and it lSzClQSlI'Gd to'be limited only by, the scope of the appended ,claims. a Y

Havingthusdescribed the invention, what 7 CHARLES FJLEPPERl I

Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US5875557 *Mar 27, 1997Mar 2, 1999Ueki; KatsumiScale
US6336274 *Jul 26, 2000Jan 8, 2002Sandra L. Ness WebsterRight angle graphing template
US8166663 *Aug 26, 2009May 1, 2012Lora EliasEvidence preservation items
US20100077624 *Aug 26, 2009Apr 1, 2010Lora EliasEvidence Preservation Items
U.S. Classification33/476
International ClassificationG01B3/56
Cooperative ClassificationG01B3/56
European ClassificationG01B3/56