US886639A - Bevel-square. - Google Patents

Description

No. 886,639. PATENTED MAY 5, 1908.

M. RENNER.

v BEVEL SQUARE. APPLIUATION FILED s211126, 1901.

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MANFRED RENNER, OF CHICAGO, ILLINOIS.

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' BEvEL-sQUARE.

Specification of Letters Patent.

Patented May 5, 1908.

Application filed September 26, 1907. Serial No. 394,611.

To all whom it may concern:

Be it known that I, MANFRED RENNER, a citizen of the United States, residing at Chicago, in the county of Cook and State of Illinois, have invented a new and useful Improvement in Bevel-Squares, of which the following is a complete specification.

This invention relates to two-bladed bevel squares, and more particularly to the means employed for setting and fixing the blades at any desired angle with respect to each other, and for setting the stock in a fixed relation to the blades and in a position to bisect the angle therebetween.

The object in view is to provide asimple and effective tool for facilitating the cutting of butt and miter joints, for measuring, laying oil and bisecting either exterior or interior angles, for marking rafter cuts and general use in framing work.

.Referring to the accompanying drawings- Figure l shows a plan of a bevel square enibodying my invention. Fig. 2 is a similar view but with the blades in position to measure an interior angle. Fig. 3 represents also a plan view but with the covering plate and blades removed from the stock. F ig. 4 represents a central longitudinal section of the stock, and Fig. 5 is a detail plan of the graduated end of the lower blade.

In the drawings A designates the stock which is preferably formed of a rectangular shaped casting recessed on its upper surface to provide spa-ce for the device which fixes the blades to the stock. A covering plate A1 is secured to the upper face of the stock by means of the rivets l). In the stock A and covering plate A1, at the blade ends thereof, are formed the alining perforations a and al, respectively, the perforation in the stock be ing considerably, larger than that in the cover. In the perforation a fits the boss c of the thumb nut O of the binding screw D. In the perforation al nts the sleeve E, the said sleeve surrounding the screw D and being interposed between the inner end of the boss c and the two bladesf andf1 on the projecting end of said screw. The binding screw D thus forms a pivotal aXis for the blades F, and the head d thereof, when the screw is tightened, draws the blades down tightly upon the end of-the sleeve. To prevent the .hwblrades being drawn against the cover plate A1 when the thumb nut O on the binding screw is tightened, the sleeve E is made to project a slight distance through the cover plate, when the head of said thumb nut bears against the stock A or in other words, the combined length of the boss c and said sleeve E is made a trifle greater than the thickness of the stock A and cover A1. The effect of this will be to bind or fix the blades with respect to each other but allow them to remain free to turn on their pivotal axes on the stock, the screw D, the nut C and sleeve E all turning at such time in the stock. The head lend d of the screw D is provided with the squared portion d1, which fits a'corresponding aperture in the upper blade f, thus causing the screw to turn with said blade.

The following means are provided for fixing the blades to the stock: The boss a0 which surrounds the aperture a, and is some what sh'orter than the boss c of the nut C,

lextends rearwardly, as shownA in Fig. 4, and

is vprovided at its end with the V-shaped notch a2. Laterally and inwardly projecting lugs or shoulders a3 are formed on the side walls of the stock A, near the top thereof and intermediate the notch a2 and the center of the screw D. Beneath these shoulders a3, and on top of the boss a", is laced the binding block G. This binding b ook is provided with an aperture g1, which loosely engages the sleeve E and is adapted to bear downwardly on the end of the boss c. The rear end of the block G has formed on its under side a V-shaped notch .which registers with the notch a2 in the boss a0. A longitudi nally extending, conically headed rod II engages with its cone-shaped head h the two notches g2 and a2. This rod H is provided with a threaded portion h1 which engages `the correspondingly threaded lug a4 in the stock A. By turning the thumb nut h2, fixed on the end of the rod H, which projects through an aperture in the end wall of the stock, the said rod will be advanced or retracted. Such movement of the rod, it is evident, will cause its conical head 7L to lift or depress the rear end of the binding block G about the fulcrum formed by the shoulders a3. If the rear end of the block is pressed upwardly, its forward end will be forced downward against the inner end of the boss c, thus` pressing the ends of the blades into contact with the cover plate A1 andholding them securely by frictional contact. By the construction thus described the blades are first fixed in relation to each other and then, by an independently acting device, are fixed to the stock.

` graduations exten In order to set the blades at `any desired angle with respect to each other, a scalelor series of graduations is formed on the pivotal end of one of the blades, with corresponding index marks on the other blade.

As it is more frequently desired to lay offthe angles which correspond `with the interior or exterior angles of regular polygons, or to lay off given angles upon the work irrespective of their measured amount, the

little more than a blade in alinement with the index marks thereon, the cut-away portions exposing the graduation on the lower blade and the numeial designatingtlie number of sides of the f polygon corresponding with that particular position.

In the position indicated in Fig. 1 the index mark on the top blade f registers with the graduation numbered 3 on the lower blade, l

which indicates that the blades are. set tol measure off the exterior angle of a triangle; w'liile in Fig. 2 they are set to measure the interior angle of a hexagoii. It is evident that the blades may thus be employed to transfer established angles or lay off angles corresponding to polygons ofA any number of sides provided for. After setting to the required angle the blades are fixed to" each A other by tightening the thumb screw C. In

transferring these angles to the work it becomes necessary to biscct theangle between the blades. This is done. by moving the stock A around to a bisectingposition between the blades and then securing the blades to the stock by advancing the threaded rod H and lifting the binding block G, as before explained. The bisecting position of the stock is determined by means of corresponding finely divided scales along the opposing edges of the blades, as shown; for instance, in the dotted line position of the stock-A, shown in Fig. l, the stock has been moved until its edges register with the corresponding number, 35 in this instance, on the scale along the edges of the blades. After having been adjusted to` this position the blades are fixed to the stock as before explained. Y

pitch angle when one of the blades is made to register therewith. The graduations on one side of the stock, or plate, are marked --C, C, etc., which refers to the pitch for common rafters, and the graduations on the other side are marked --H, H, etc., referring to the angle for hip rafters of the corresponding itch.

hat I claim as my invention, and desire to secure by Letters Patent, is:

l. A bevel square comprising a stock, two independently movable blades pivotally mounted thereon, two sets or series of graduations ard corresponding index marks provided on the pivotal ends of said blades, one series for measuring external angles and one for measuring interior angles, the said graduuations enabling the blades to be set at any angle with respect to each other, means for fixing the blades relative to each other, and independent means for fixing the blades to the stock, substantially as and for the purpose described. q

2. A bevel square comprising a stock provided on its upper. face with rafter-pitcli graduations with which the blades may be made to register and thereby indicate the required angle in rafter work, one margin of said face being provided with pitch graduations for common rafters, and the other. margin thereof with pitch graduations for hip rafters, twox independently 'movable blades pivotally mounted thereon, said blades having on their pivotal ends two seiies of graduations enabling them to be set at any desired angle with respect to each other, a thumb screw a sleeve and bolt for'fixing the blades relative to each other, and means for fixing the blades to said stock, substantially as and for the purpose described. l

3. A bevel square comprising a two-piece hollow stock, a bolt extending through one end of the stock, two independently movable bladesmounted on one end of said bolt, Aa thumb screw provided with an inwardly projecting boss engaging the other end of said bolt, a sleeve surrounding said bolt and interposed between the end of the inwardly projecting boss and the said blades, the length of the boss and sleeve being slightly greater than the thickness of the stock, thereby permitting'the blades to be fixed to each v other without being xed to the stock, graduations formed in the pivotal ends of said blades to enable them to be set at any desired angle with respect to each other, and means for fixing the blades to the stock, substantially as and for the purpose specified.

MANFRED RENNER.

Witnesses:

J. C. WARNER, GEORGE H. SPAULDING. s

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