US154526A - Improvement in bevel-gages - Google Patents

Description

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Beye'l-Gagea Patented Aug. 25,1374.V

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THE GRAPH l; C0. PHOTO .LXTH. 29 4l PARK PLACE, N.Y,

`'lELrrENT OFFICE.

WILLIAM E. SKINNER, OF MILFORD, MICH., ASSIGNOR OF TWO-THIRDS HIS RIGHT TO GEO. D. AUSTIN AND QUINOY MATTHEWS, OF SAME PLACE.

IMPROVEMENT IN BEVEL-GAGES.

Specification forming part of Letters Patent No. 154,526, dated August 25, 1874; application filed f May 5, 1873.

To all whom it may concern:

Be it known that/I, WILLIAM E. SKINNER,

of Milford, county of Oakland and State of Michigan, have invented an ImprovedBevel- Gage.

The following description, taken in connection with the accompanying plate of drawings hereinafter referred to, forms a full and exact specification, wherein are set forth the nature and principles of the invention, by which the same may be distinguished from others of a similar class, together with such parts thereof as are claimed as new, and are desired to be secured by Letters Patent of the United States.

My invention consists in an attachment to carpenters7 bevel-squares, whereby the blade or tongue of the same can be adjusted and set to any desired angle and securely fixed there; said attachment consisting of a quadrant divided on its face intoA the degrees of a quartercircle, fastened to the stock of a bevel-square by means of a stationary hinge, and sliding and turning upon the same.

In describing, I refer to the annexed drawings making part of this specification, and illustrating my invention more fully.

Figure lrepresents my invention in a perspective view. Fig. 2 is a top view of my in vention attached to a bevel-square. Fig. 3 is an end view of the same.

Likeletters of reference in the several ligures indicate like parts.

A is a metallic plate, its shape being that of a quarter-section of a ring. It is provided on its face with a number of divisions, A1, on both its circular edges, said divisions being the degrees of a quadrant, and having a common center wherefrom they radiate. The face of the plate A is also provided with a number of lines, A2, and two rows of numerals, A3, directly between and corresponding with lines A2. The dial-plate A is bent on one edge to a double right angle, and there provided with two hinges, B B. G is a stationary hingeplate. 1t is fastened to the stock of a bevelsquare, and provided with a stationary pivot, y,

D, whereupon the dial-plate A is sliding and turning. E is the stock of a common bevelsquare, and F the tongue or blade of the same. G is a thumb-screw, fastening tongue F within the stock E.

It will be observed that the dial-plate A is movable upon the pivot D, and that it is sliding upon the same. This is rendered necessary, from the fact Vthat the point of intersection of all the divisions upon plate A andl the blade or tongue F varies according to the number of degrees of the angle indicated between them. It will also be observed that, besides the degrees of a circle, the face of the dial-plate A is provided with eight lines on each end of the circular partof plate A, marked A2, and with two rows of numerals directly below the lines A2, marked A3. Their purpose is to enable a carpenter to set the bevel-square to any desired inclination or pitch of a roof for buildings, and at the same time give ready means for calculating the proper length for the rafters for said building, the lines A2 and the rst row of numerals, A3, indicating what is known to carpenters as one-eighth, one-sixth, one-fth, onefourth, one-third, one-half, two-thirds, and three-fourths pitch, and the second row of numerals, directly below andcorresponding with those of the first row, designating that for every foot of half the width of a building, three-eighths, or live-eighths, or seven-eighths, or one and three-eighths, or two and threeeighths, or live, or eight, or nine and veeighths inches are to be added to that number to give the proper length of the rafter of the building; as, for example, suppose a building to be twenty-four feetv wide and of oneeighth pitch of the roof, then 24-2-2=12 12:12 feet 4g; inches, the proper length of the rafter.

In order to set the tongue of the bevelsquare to any desired angle, it is only necessary to slide the plate A up and down and turn the blade or tongue F until its edge coincides with the divisions or degrees on both edges of the circular part of A, when the same will be set to the desired angle, and can be securely held there by means of the thumbscrew G. The object of sliding the dialplate, as described, is to adjust the same so that the radial divisions on its face may be brought to coincide With the face of the blade or tongue F at the points required. This adjustment is rendered necessary on account of the face of the blade being used While the blade is pivoted on the thumb-screw Gr, passing through the center of the blade F.

When the blade F has been adjusted by means of the dial-plate A, the said dial-plate may be swung backward, as indicated in dotted lines n Fig. 3, When it will be'entirelyout of the way, and the bevel-square ready for use.

I prefer to make my improved attachment of sheet metal, and stamping the divisions and figures upon the same; but it may be also made in various other Ways.

able plate A, provided on its face and both its circular edges with indentations or marks corresponding to the degrees of a quarter of a circle, and fastened to the stock E by means of the` stationary hingepart C and pivot D, substantially as described. v

WILLIAM E. .SKINNER Witnesses:

AMICHAEL J. STARK, DANIEL MORRISON.

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