US1096511A - Protractor. - Google Patents

Description

H. H. LIGHTLE. PROTRAOTOR. APPLIGATION FILED JUNI: 9, 1913.

Patented May 12, 1914.

HARVEY H. LIGH'ILE, 0F SYRACUSE, NEWT YORK.

PROTRAC'I'OR.

Specification of Letters Patent.

Patented May 12, 1914.

Application led June 9, 1913. Serial No. 772,500.

To all echo/n it may concern lie it known that l, HARVEY H. Lief-rims, a citizen of the Dominion of Canada and a subject otl the. King of (,irreat Britain, residing at Syracuse, in the county oi Onondaga and State of New York, have invented certain new and useful lmprovenients in Protractors, ot which the following is a speciiication.

My invention relates to improvements in drattmens and mechanics protractors, and has for its object to provide a movable graduated protractor or segment, having two straight rulers or drawing sides arranged at right angles to each other, and which permit the drawing of angular lines in any direction without hindrance 'from any of the supporting parts.

A. t'urther object is to provide meansI for determining or calculating the degree of any angle. as well as the dividing of a circle into the desired number o1 parts. And ay further object is to provide novel and simple means tor extending the straight or drawing sides ot the instrument.

These objects are attained by the means described in theI annexed specification, and illustrated in the accompanying drawing, m which Figure 1 is a plan View; showing by full and dotted lines the construction, arrange ment and operation ot my complete device. Fig. is an edge view of the same. Figs. 3 and l are resl'iectively a. plan and an edge view ot the extension blade or ruler. Fig. 5 is an enlarged sectional view taken substantially on line 5 5 of Fig. 1; showing the construction of the pivot which support-s the movable preti-actor. Fig. 6 is an enlarged sectional view taken on line 6t3 of Fig. l; showing the construction and arrangement ol'l the adjusting and (i-.lamping means. Fig. i' is a plan view ot' the movable protractor.

ln the drawing, 2 represents the protractor which preferably comprises one part, having the center cut away, and having. similar ruling sides or edges 3 and 4L, which are arranged to intersect at right angles to each other. The rulers 3 and il are connected at their corresponding ends, by means ot an integral arched l'n'otraetor 5, which preferably comprises a quadrant, graduated `from 0O to 90o, and the graduations are numbered so as to read from zero from the opposite ends of the part 5. The movable triangnlar part B-tis pivoted, and is therefore oscillatable, by means of a screw or stud and a nut. l to one end oil an arm or bracket 7, and is thus allowed free movement or swing in opposite directions, for drawing lilies along the edges and 4, at any angle within a radius of 1800. The bracket or support 7 is preferably formed A-shaped, as shown, so as to give it adequate strength. and its opposite end is rigidly secured to a base 8 in any suitable manner, as by rivets t). The base S is pre'feably disposed at right angles to the longitudinal center ot' the bracket 7, and its edge 8 is intended to rest against, or slide freely in opposite directions along a T-sqnare, or other suitable instrun'ient (not shown). The quadrant 5 is provided with a concentric slot ll), in which is disposed a screw ll, which engaged by a thumb-nut 12. The slot l() is of suitable length for allowing the protractor to be swung in opposite directions on the pivot (3, as indicated by the dotted lines in Fig. 1, and it may be readily secured in any desired position by the tightening up oi the thumb-nut l2. The base S is provided with a single graduation or mark 13, having an arrow point or head which points to the gra duations oit the quadrant 5. lVhen the movable protractor is set in the position shown in tull lines in Fig. l, the mark 13 points to lo degrees on the quadrant, and the dra'ltsuian may draw a line along either ot the edges 2% and lat an angle of exactly 45 to the base rhen the protractor is swung or moved to the right as far as allowed by the slot 110, and screw 11, a horizontal line may be drawn along the edge 4, while a vertical line may be drawn along the edge It. And when the protractor is swung to the le't't the tull distance, a horizontal line may be drawn along the side 3 and a vertical line may be drawn along the side 'l; (see dotted lines in Fie'. l).

lt is sometimes necessary to draw lines o1 greater length than the edges 3 and l, and in order to meetsuch a contingency, l. provide an extension bar or part 'l-l. which is pre'lrably made in the Atorni shown in Figs. l, 2, Il and l. rlhe extension is provided with a longitudinal slot l5 in its oltset portion 1l to receive al' thumb-screw 1G, the threaded portion ol? which passes tln'ough the slot 15 and screws into a perforation 1G near the intersection ol. the rulers 3 and 4. The thnmbscrew 1( .is employed tor holding thel bar T14 in place, and also serves as a pivot for allowing the extension to be swung in opposite directions :tor extending the lines. 17 represents a second thumb-screw which passes through a perforation 17 formed near the end of the portion 14 of the extension, and this screw engages corresponding threaded perfor-ations 18 in legs or parts 3 and 4.

In Fig. 1 l have shown the blade 14 in full lines set for extendino' a line drawn alone" the side 8. To shift and set the blade 111 for extending a. line drawn along the side t, the thumb-screw 17 is iii-st unscrewed and removed, and then the thumb-screw 16 is loosened stiliiciently t0 allow the blade 14 to be drawn outwardly away from the protractor to the extent allowed bv the slot 15. The blade 111 ma then be swung around until it alines with t ie ruler 4, after which it should be moved in the opposite direction the full length of the slot, which will allow the screw 17 to be applied to the other perforation 18. By this means 1 am able to provide for extending the angular lines in either direction in a quick and ready manner and accomplish the extension work with a common blade or ruler. For ordinary work the extension 11 may be dispensed with entirely. The portion 111 of the extension is preferably beveled on -its opposite sides so as to prevent unnecessary thickening of the drawing edge at the point where the parts overlap.

By constructing and arranging my oscillatable drawing` instrument as herein shown and described, a draftsman may draw lines in any direction along either of the rulers 3 or L1, as well as at right angles to another line, with perfect freedom and without liability of his pen or pencil coming in contact with either the bracket 7 or the base 8. And furthermore it is a particular object of the present invention to provide a combined protractor and drawing` instrument which may be used and moved freely along a T- square or other part while the ink is still wet without danger of marring or blurring the work. By the use of'my improvement, a di'aiitsman may draw ink lines in rapid succession, and slide the instrument from one position to another and not be required to pick up the instrument and replace or readjust it after each line is drawn.

lt is obvious that some changes or modifications niay be made in the parte and in the arrangement or' the saine, within the scope defined by the appended claim without departing from the spirit or' my invention.

Having thus described my invention,Y what claim as new and desire tov secure by Letters Patent, is-

in a device of the class described, the combination with a supporting frame, of a protractor pivotally connected tothe supporting frame, one of said parts having a graduated arcuate portion and the other of said parts having an index adapted to register therewith, said protractor including two ruling edges extending at an angle t0 each other, and an extension member adjustably connected to the protractor and'adapted to be adjusted to form a continuation of either of the rulingedges of the protractor.

ln testimony whereof I affix my signature in. presence of two witnesses.

HARVEY H. LIGHTLE.

Titnesses WM. C. ANDERSON, HARRY Dn WALLACE.

*ZE-pies of this patent may be obtained for ve cents each, by addressing the Commissioner of Patents,

Washington, D. C.

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