US718817A - Protracting-square. - Google Patents

Description

No. 718,817. PATENTED JAN. 20, 1903.

S. A. CALDWELL & S. B. TERRY.

PROTRAGTING SQUARE.

APPLIOATION FILED APB. z5, 1902.

E() MODEL.

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UNrTED STATES PATENT Ormes.

STEVENSON A. CALDWELL AND SEYMOUR B. TERRY, OF LITTLE SIOUX, IOWA.

PROTRACTlNG-SQUARE.

SPWIFIGATION forming part of Letters Patent No. 718,817. dated January 20, 1903.

Application filed April 25. 1902. Serial No. 104|6SI. (No model.)

To all whom. t may concern.:

Beit known that we, STEVENSON A. CALD- WELL and SEYMOUR B. TERRY, citizens of the United States, residing at Little Sioux, in the county of Harrison and State of Iowa, have invented new and useful Improvements in Protracting-Squares, of which the following is a specilication.

This invention relates to a protractingsquare for use by carpenters and others; and the object of the same is to provide a device embodying means for adjusting an ordinary form of square at an angle and to positively vary the degrees of angular adjustment of said square through the use of a protractor ineluded in the organization of the contributing elements, and also to simplify the construction and produce a strong and durable device of this class adapted for use in performing different kinds of work and assisting an operator in maintaining and ascertaining different angles in cutting up lumber and in general structure erections.

The invention consists in the construction and arrangement of the several parts, which will be more fully hereinafter described and claimed.

' In the drawings, Figure l is a perspective view of a square embodying the features of the invention. Fig. 2 is a detail perspective view of a protractor-carrying member forming part of the device. Fig. 3 is a detail perspective view of a part of the stock. Fig. 4 is a detail perspective view of the'square proper. Fig. 5 is a transverse vertical section on the line 5\5, Fig. 1. Fig. 6 is a'transverse vertical section on the line 6 -6,'Fig.A 1. tail perspective view of the pivot-pin for the square.

Similar numerals of reference are employed to indicate corresponding parts in the several views.

The numeral 1 designates the lower stock member, comprising a metallic socket-plate 2, having a laterally-projecting protractor-support 3 at' one side'with an opening 4 therethrough and a surrounding or marginal flange 5., which continues from a flange 6, extending along the adjacent side edge of the plate 2 and over one end of the latter. Secured to the inner end of the socket-plate 2 is a wooden Fig. 7 is a destrip 7, having a recess 8 in the upper side thereof which provides a iiange 9, alined with the flange 6 and an end shoulder 10. The bottom wall of the recess 8 and the top surface of the socket-plate 2 are iush, and by this means the lower stock member lis formed with a seat to receive an upper stock member 1l, comprising a substantially rectangular wooden strip l2 and a metallic closing plate or protractor member 13, having a laterallyprojected protractor 14 at one side held by an arm 15, adapted to it into the protractor-support 3 of the plate 2. The protractor member 13 is formed of metal and has a flange 16 surrounding the edge and end of the same which normally bears upon the flange 6 of the plate 2, and by this means the upper side of the said protractor member is provided with a seat to receive an eXtension of lthe strip 12. When the strips 7 and l2 are respectively applied to the plate 2 and protractor member 13, a flushv upper and lower surface isA produced, the several connected parts being proportioned in such manner as to arrive at this result. The plate 2, protractor member 13, and the strips 11 and 7 are increased in width adjacent to the location of the protractor-support 3 and protractor 14. to form an extended bearing surface or inclosure for a purpose which will be presently set forth.

The improved device also comprises a metallic square 17, having the usual long and short arms and provided with scale-marks Vrepresenting inches and fractions of an inch.

At the inner corner or angle of intersection of the two arms ofthe square an opening 18 is formed to receive a collar 19 on a pivot or fulcrum pin 20, the said collar being centrally located, and portions of the pin above and below the collar are immovably held in the plate 2, protractor member 13, and strips 7 and 1l. The pivot-pin forms the center from which the arc of the protractor is struck or delineated, and by the use of the collar 19 the several parts of the stock, including the plate 2, with its protractor-support 3, and the protractor member 13,v with the protractor 14', are held apart a sufficient distance to permit the square 17 to swing or turn on the said collar outwardly from and partially into the slot IOO thus formed between the parts of the stock. Vhen the longer arm of the square is held closed within the stock, the improved device can then be used as an ordinary square for laying out work, and to maintain the square either in a partially-inclosed position, as set forth, or projected at an angle said square at the point of intersection of the arms or near said points is formed with asegmental slot 21, struck from the pivot-pin 20 as a center and engaged by a clamping-pin 22 passing therethrough and the adjacent portions of the stock and supplied with a clamping-nut 23 on the upper end thereof, which is adapted lo bear against the top of the stock. By tightening the clamping-nut 23 the square will be held immovable in the position desired. The square adjacent the point ot' intersection of the arms thereof is also .formed with a pointer or indicator 22, which movably projects out between the parts of the stock and extends across the openings in the protractor-support and protractor and has its free end held under the latter, as clearly shown by Fig. 1. This pointer or indicator 22a cooperates With the degree-scale of the protractor 14, and the square 17 can be set at any angle desired by adjusting the pointer to the mark on the protractor corresponding to such angle.

From the foregoing description it will be seen that a convenient tool or implement is provided for the use of carpenters and others in laying out work and in erecting structures where it is frequently necessary to transfer angles in making similar cuts in different pieces of timber, and also for ascertaining and measuring angles of structures to which additions are to be made and embodying irregular positions in relation to each other. It will also be seen that the free end of the pointer is protected and will be prevented from becoming broken, and when it is desired to use the implement as an ordinary square the longer arm of the square 17 may be held inclosed within the stock 1.

A material advantage resides in the disposition of the collar 19 and the pivot or fulcrum pin 20. While the collar on the said pivot-pin holds the parts of the stock separated, its main office is to insure firmness in the attachment and operation of the square. The collar gives a rotary bearing that retains the inner angle of the square ush With the operating edge of the stock at all times, no matter in what position the square is placed. This is essential in View of the fact that if the inner angle of the square does not remain constant with the plane of the operating edge of the stock the instrument would be imperfect.

It is obvious that changes in the size, form, proportions, dimensions, and minor details may be resorted to Without departing from the spirit of the invention.

Having thus fully described the invention, what is claimed as new isl. In an implement of the class set forth, the combination of a stock, comprisinga protractor-support and protractor at one side, the said stock being made up of superposed parts which, with the protractor-supportand proti'actor, are held in spaced relation, and a square movably mounted in the slot and having a pointer projecting through one side of the latter and the free end held between the protractor and protractor-support.

2. In an implement of the class set forth, the combination of stock comprising a protractor-support and protractor, the stock being made up of superposed members, separately carrying the protractor-support and protractor, a pivot-pin in concentric relation to the protractorand having a collar thereon which holds the parts of the stock separated, and a square having an opening therein to fit over the collar of the pivot-pin and also provided with a movable pointer to coperate With the protractor.

In testimony whereof we affix our signatures in presence of two witnesses.

S'IEVENSON A. CALDWELL. SEYMOUR B. TERRY. Witnesses:

J. M. IRELAND, L. L. REYNOLDS.

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