US853157A - Try-square. - Google Patents

Description

PATENTBD MAY 7, 1907. lR. A. BRBUL. TRY SQUARE. APPLICATION FILED APB. 26, 1906.

, rus Nomus Psr'sns co., WASHINGTON, n. c,

UNIT STATES FFIUE.

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TRY-SQUARE.

Specification of Letters Patent.

Patented May '7, 19,07.

Application filed April 26,1906. Serial N0. 313,772.

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Be it known that I, RICHARD A. BRE'UL, a citizen of the United States, and a resident of Bridgeport, in the county of Fairfield and State of Connecticut, have invented certain new and useful Improvements in Try- Squares, of which the following is a specification.

My invention relates to an improvedl square and belongs to that class of` squares having an adjustable blade for laying out both right angle andbevel lines.

It is the object of my invention to produce an all steel square, of the above class, with an improved form of back to which the blade is pivoted; to provide a square which can be used both as a try square or a bevel square with means for adjusting the blade and locking it in various positions representing different degrees of a circle; to provide means whereby the blade may be quickly set and fixed in any particular position desired, and finally to design it in such a manner as to permit of its manufacture from sheet metal, which can be inexpensively stamped ou and struck up to form the several parts ready for assembling.

Referring to the accompanying drawings forming a part of this specification similar characters of reference denote like or corresponding parts throughout the several figures and of which,

Figure 1, shows a side elevation of a square embodying my improvements, the blade being also shown in a shifted position, by dotted lines. Fig. 2, is a top edge or plan view of the square shown in Fig. 1. Fig. 3, is a detached plan view of the lifting lever shown in Figs. 4 and 5. Fig. 4, is a back edge view of the square shown in Figs. 1 and 2. Fig. 5, is a similar back edge view of the square, the blade being shown in an inclined position. Fig. 6, is a detail side elevation of the inner end portion of the blade. Fig. 7, shows an end, and a central vertical sectional view of the sheet metall stud attached to the blade and by means of which it is pivotally connected to the back. Fig. 8, shows a fragmentary side elevation of the upper portion of the back and inner end'of the blade, in an adjusted position, with a slightly modified form of locking device.

Referring in detail to the numerals of reference marked upon the drawings, 10 indi eates a blade which maybe graduated in the usual or any preferred manner, and which obviously contains an upper and lower straight edge, along which lines may be drawn as in the marking out of work.

11 indicates the back of the square which may be formed of sheet steel slightly heavier than that of the blade. The two vertical edges of this back are deflected in op osite directions at a right angle to the back), one forming the outer edge 12 and the other an inner edge 13 parallel with the outer edge, either of which may be used against one edge of the work, while laying out angular lines with relation thereto. The upper portion of the back 11 is provided with a round hole 14 through 'which the cylindrical portion 15 of the stud 16 is pivoted and operates in the shifting of the blade. The stud is further provided with a square portion 17 which in practice is seated in the square hole 18 in the inner end of the blade in a manner to rigidly secure the parts together. The stud further contains a flange 19 one face of which lays up flush against the back of the blade when the parts are assembled. The inner reduced square end portion 20 of the stud 16 engages a corresponding square hole in the swinging arm 21 attached thereto. In practice the extremity of this small end of the stud is laid back over the face of the arm 21 as indicated in the several figures, to firmly secure the parts together, it being obvious of course that both the blade and arm thus become rigidly fixed to the shouldered portions ofthe stud, While the cylindrical portion of said stud is free to turn within the holey 14 of the back, thus allowing the blade to be adjusted from the right angle position shown in Fig. 1, to any intermediate angular or bevel position desired, as indicated by the dotted lines of the blade shown in Fig. 1. The inner end of the blade is cut away as at 22 to accommodate the upper portion of the fiange 12 of the back, and is further provided with a shoulder 23 which in practice is seated upon the top edge of said ange 12 when the blade is disposed at a right angle to the back, as shown in Fig. 1.

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To the front side of the back I attach by I means of a screw 24 a spring plate 25, the upper end of which is cut away to form a circular series of teeth 26 which in practice are engaged by the toothed end 27 of the arm 21 the normal tendency of the upper end of this spring plate is to lay up close to the back as indicated in Fig. 4. A pocket 28 is formed on the under side of the plate and is provided IOS IIO

with a hole 29 through which a lifting lever 30 is operated. Said lever is preferably formed of sheet metal and contains trunnions 31 which in practice lay transversely across the pocket intermediate of plate and back in a manner to hold the lever in place at t all times ready for operation. The said parts are so constructed and proportioned as to permit of the springplate assuming its normal position' close against the back, -in engage'inent with the tooth 27 of the arm 21, when the lever is in a closed osition as shown in Fig. 4, and to insure said plate being withdrawn from the engagement of said arm, when the lever is disposed at a right angle, as shown in Fig. 5. This latter position ofthe lever obviously permits of the free adjustment of the blade and arm to any position desired and provides a convenient and quick form of lock to retain said parts in such adjusted position. As designed in Fig. 1, each of the teeth represent tive degrees, which permit of the blade being adjusted and locked in a position indicating any degree of a uarter circle which is a multiple of ive. W 'le the construction shown in Fig. 8 conh tains a finer toothed edge, which obviously would allovir the blade to be adjusted liner and to positions representing any degree desired. The arm 21 may contain one or more teeth 27 as shown, the upper portion of the teeth being preferably beveled or cut away as shown at 22 in Fig. 1, to insure a more positive and quicker engagement of the spring plate with the arm, as is obviously ap arent.

{aving thus described my invention what I claim and desire to secure by Letters Patent is 1. In a square of the class described, the combination of a back, a bladepivotally connected thereto, a toothed arm connected with said pivotal blade, a spring plate attached to the back and having a series of teeth to engage the teeth of the arm, and means to engage and disengage the plate i .from such arm.

` gage and disengage the plate from such arm.

3. In a square of the class described, the combination of a back, a blade pivotally connected thereto, a toothed arm connectedwith said pivotal blade, a plate attached to the back having a circular series of teeth to engage the yteeth of the arm, and a lever to engage and operate the plate to disconnect it from the arm to permit of the adjustment of said arm and plate; t

4. In a square of the class described, the combination of a back, a stud pivoted in the back, a blade secured to the stud at one side of the back, an arm secured to the stud at the other side of the back, a spring plate attached to the back, having a circular series of teeth to engage the teeth of the arm, and

means to engage and disengage the plate from such arm.

5. ln a square, the combination with a blade, of a back connected therewith having its outer edge deileoted in one direction and the inner edge deflected in the opposite direction said edges forming flanges along the entire length of the back, the said inner flange arranged to extend both above and below the inner edge of the blade.

6. In a square of the class described, the combination with a back, a blade pivotally connected thereto, an arm connected with said blade bearing a tooth having a beveled top edge, a spring plate attached to the back having a circular series of teeth to engage the beveled tooth of the arm, and means for operating the spring plate to engage and disengage saidplate. l

7. The combination in a s uare, of a back, a blade pivotally connected t ereto, a spring plate to hold the blade in dilierent positions, a lever pivoted in a pocket of the plate, and adapted to be operated to lock and unlock vthe blade.

8. In a square of the class described, the hcombination with a back and blade, of a stud pivotally connecting the two, and comprising Fair ield, and State of Connecticut, this 25th day of April, D., 1906. t

RCHARD A. BREUL.

Witnesses:

C. M. NEWMAN, RUTH RAYMOND.

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