US397500A - Drafting-instrument - Google Patents

Description

(No Model.)

S. HOADLEY.

DRAFTING INSTRUMENT.

No. 397,500. Patented Feb. 12, 1889..

UNITED STATES ATENT rricn.

DRAFTlNG-INSTRUMENT.

SPECIFICATION forming part of Letters Patent No. 397,500, dated February 12, 1889.

Application filed August 28, 1888. Serial No. 284,000. (No model.) i

To all whom it may concern.-

Be it known that I, SILvnsrEn I-lononnv, a citizen of the U11 itcd States, residing at Gosnort, in the county of Owen and State of Indiana, have invented certain new and useful Improvements in Drat'ting-Instn-uments, of which the following is a specification.

The object of my said invent-ion to produce an improved construction of instrument, by which any desired distance may be divided into any given n umber of equal spaces. This object is accomplished by hingin or pivoting a graduated bar to a suitable frame-work at one end, and securing said bar at the other end to a curved arm forming a segment of a circle of which the hinge-joint is the center.- The bar should have several sides, and each side should have a graduation different from the others. There should also be a thumbnut to fasten it to any desired position, and a draftsmans square (either with. or without the peculiar attachment to be hereinafter described)-is to be used in operating the device.

Referring to the accompanyingdrawings, which are made a part hereof, and on which similar letters indicate similar part s, l igure '1. is a perspective view of my im n'oved instrument; Fig. 2, a top or plan view of the same, two positions of the pivoted bar being shown, one by means of dotted lines; Fig. 3, a transverse sectional view looking toward the right from the dotted line 2 3 in Fig. 2; Fig. 4-, a detail sectional view on the dotted line -t 4- in Fig. 2, and Fig. 5 a detail section through the square on the dotted line 5 in Fig.

In said drawings the portions marked A represent the base of the instrument, ll the pivoted bar, C the curved arm, and D the square.

The base A is generally a bar of wood made in the form of a ruler, and it preferably has upon its upper edge a scale (shown as fifteen inches long) by which measurements may be had. Two arms, A and A extend out therefrom, to one of which the bar B is hinged or pivoted, and from the other of which the curved arm 0 extends, or with which said curved arm is formed in piece. These arms A and A permit a space in which to work. alongside the base A, between it and the bar B. The frame which the parts A, A, and A form should be strong and substantial, so that the instruimmt may give accurate results in use.

The bar 1 is secured to the arm A of the frame by a hinge or pivot joint, 7), and at the other end it is secured to the curved arm This bar is preferably made with several sides, (it is shown as having eight sides, or octagonal,) and each side is spaced equally throughout its length, the divisions being preferably shown by points, as indicated in the drawings. The graduations upon the several sides are different from each other, in order that the instrument maybe adapted to a great varietyot uses. .In order that the bar I may easily rotate, the hinge by which it is secured to the standard A, and also the means of attachment to the curved arm must be so constructed as to permit said bar to revolve Freely thereon. To this end the, rod or shaft B may extend entirely through the bar, and these attachments be made to said shaft, so that the bar itself shall be free to turn thereon. In Order, however, that it shall not turn too easily, a spring, I), may be interposed between its end and the inner face of the. curved arm 0. That portion oi the attachment which comes in innmaliate mntact with the curved arm is preterably formed with an opening or mortices, through which said arm passes, and a thumb-nut, U is placed upon the outer end of said attachment, and. by means of this nut when the bar is moved to the desired position it can be securely held thereby turning said nut so it will bear against said arm, ora washer, c, placed between it and s.-tid nut.

The arm is secured to the arm A or to the end of the base A, (said arm A' being of no particular use, except to give the instrument a symmetrical apljlearances) and exteinls out a sut'ticient distance, so that the bar l3 may be moved to any desired angle and there secured. Its only purpose is to enable said bar B to be held securol y to the desired position.

The square l) is, in its general form, substantially an ordinary drat'tsmans square. As it is, however, sometimes n.'eierable that the markings made by its use shall be at some thing of an angle, as when it is desired in laying off lettering to make theletters italicin form, I have provided a wing, I), which extends down from the blade of the square to the convenience and expedition with which such surface on which the instrument rests, which Wing is mounted upon a pivot, d. This pivot extends up through the blade of the square, and its upper end is preferably threaded and bears a tlillll'li)-lllli, (Z By this means said wing can be secured at anyanglewith the blade of the square desired,or directly in line therewith, as maybe necessary to enable the work in hand to be properly executed. As will be readily understood, this adds greatly to the work. can be performed. As before stated, the object of this inven tion is to enable the user to divide into equal l spaces any desired distance. This is useful in many sorts of drafting, particularlyin such i work as the dividing of the width of tombf stones and mmunnents when laying out the I lettering tor the inscriptions tilmreon. l or illustratitm, suppose that the available SIJZLPG foranycertain lineot lettering is eleven inches andthe number of letters to be put in the line i will require twentyseven spaces. In using an instrument of the character herein. shown I would first place the square D so that the side of its blade where it crossed the part A would register with the mark indicating eleven inches. I would then turn the bar I; until a point indicating twenty-sevmi (or a multiple thereof) was near the blade where it. crossed the bar. I would then move said bar on the curved arm (3 until said point was brougl'lt exactly alongside said blade, fasten the bar B in that position, and then by slipping the square from point to point and making a mark at each one (or each second or third one, as the case might be) the space would be exactly evenly divided into the twenty-seven spaces required. Asthe instru ment; I have made is constructed, it would be more convenient to bring the bar so that the tit.'t v.t.' urt;h point would come alongside the square when it crossed the bar A at. the elev(.*nth-inch mark, and then move the f square two points on the bar l for each mark made. In the practical laying out of letters where the letters are large the work may be Jnuch facilitated by so arranging the instrut ment that each letter laid out will take, say, five spaces and a single space be the distance between the letters, in Which case the position of both sides of each letter and the proper dis- I tance between the letters are all accurately determined at one operation.

I do not by any means expect to limit myself to the above use of my invention, as it may advantageously be put to a variety of uses, but have described that use as among those to which it is peculiarly adapted and where it is of great value.

Having thus fully described my said invention, what I claim as new, and desire to secure by Letters Patent, is

1.. In a draftirig-instrument, the combina tion of the base A, provided with the arms A and A the bar B, hinged to said arm A, the curved arm C, extending out from said arm A said bar I being mounted to slide thereon, and the dra'tt'tsmans square D, all arranged and operating substantially as set forth.

2. The combination, in a drafting-instrument, of a base or frame, a curved arm extending out therefrom, and a graduated bar having graduations of different lengths upon several sides hinged to said base or frame and rcvoluble upon its own axis, whereby either of its sides may be brought into use, substantially as set forth.

3. The combination, in a drafting-instrul ment, with the main structure thereof, of a draftsmans square extending across it, the blade of which is provided with a wing extending down to the surface on which the instrument rests, said wing being pivoted as describcwl, whereby the markings can bemade at an angle wit-h the direction in which the square is moved over the instrument, substantially as set forth.

In witness whereof I have hereunto set my hand and seal, at Indianapolis, Indiana, this 231d day of August, A. I). 1888.

SILYESTER HOADLEY. [L. s]

\V it nesses:

(3. BRADFORD, 1 wool).

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