US524417A - Combined bevel and square - Google Patents

Description

(No M0de1.)

T. PAHEY. GOMBINED BBVEL AND SQUARE.

Patented Aug. 14, 1894.

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UNITED STATES PATENT Gruen.

` especially designed for carpenters and build` COMBINED eEvEL VAND SQUARE.

SPECIFICATION forming part of Letters Patent No. 524,417, dated August 14, 1894.

l Application led March 23, 1894- Serial No. 504,739. (No model.)

To a/ZZ whom it may cora/cern..-4

Be it known that I, TIMOTHY FAHEY, a citi zen of the United States, and a resident of Spokane, in the county of Spokane and State of `Washington, have invented certain new and useful Improvements in aCombined Bevel and Square; and I do hereby declare the following to be a full, clear, and exact description of the invention,such as will enable others skilled in the art to which it appertains to make and use the same.

This invention relates to a bevel and square ers to facilitate the laying ont of work in the construction of roofs and other coverings in which the beams are supported at their ends and incline to the horizontal throughout their j length.

The primary obj ect is to facilitate the reckoning of the lengths of beams for a given span and pitch and determine the top and the bot-V tom cuts. Also to accurately indicate the cuts of the ends of the braces, posts and rafters.

With these ends in View and such otherso as appertain to the invention, the improve- -ment consists of the novel construction of instrument hereinafter more fully described and claimed, and which is shown in the annexed drawings, in which- Figure l is a plan view of an instrument embodying the invention. Fig. 2 is a detail view in section showing the means for securing the blades together in the required position. Fig. 3 is an end View showing the clip for holding the free ends of the blades together when closed, and the flange to support the instrument on the beam, rafter or other part of the structure to which it is designed to apply the instrument.

The instrument consists of 4two blades A and B which are pivoted together near one end by suitable means. The blade B has a concentric series of graduations b at one end arranged in concentric arcs. Each arc is differently graduated to correspond with the different pitches, the number of arcs depending upon the range and scope of the instrument.

The blade-A has a semi-circular projection a which overlaps the blade B at the center of the graduations b and receives the pivot by means of which the two blades are connected.

The end projecting in the rear of the projection a is in line with the inner edge of the blade and is beveled, as shown at e, to travel on the graduations b and indicate the cuts at the ends of the beams corresponding to the length of span and the pitch of the rafter. The blade A when closed has its inner edge portion resting on amarginal portion f at the inner edge of the blade B and the free end extending beneath a keeper E attached to the blade B near the free end.

Each of the blades has a corresponding series of horizontal and longitudinal gradua tions which bear a certain relation to the semi-circular graduations b, and which indicate the top and the bottom cuts of the rafters, beams, braces, &c.

The pivot consists of a fiat headed screw G passing through the blades and provided on its projecting threaded end with a washer g corresponding to the head of the screw, and with a thumb screw H. To set the blades the thumb screw is loosened sufliciently to permit the blades to be turned relatively on the pivotal connection. After `the blades have been properly positioned they are secured by tightening up the thumb screw H.

To support the instrument on the rafter or beam it is provided with a laterally projecting iiange I which forms a base. This fiange is a piece of sheet metal havingits upturned edge soldered, riveted or otherwise secured to the marginal edge of the blade B and adapted to project from the side opposite to that having the graduations.

Having thus described the invention, what is claimed as new is 1. A combined square and bevel composed of two blades, one blade having a marginal edge and a concentric series of semi-circles dilferently graduated, the other blade having a semi-circular projection, and a beveled edge in the rear of the said projection to co-operate with the aforesaid semi-circular graduations, and a pivot connecting the blades, snbstantially as described.

2.1.A combined square and bevel composed of two blades, one blade having a marginal edge and a concentric series of semi-circular graduations, the other blade havinga semicircular projection and a beveled edge in the rear of the said projection, a pivot connecting the blades, a keeper at they free end of one of the blades, and a flange or base projected laterally from lthe marginal edge of the said blade,'substantially as described.

3. The herein described combined square;

bevel and reckoner composed of two blades having a corresponding seriesfof longitudinal and transverse graduations, one blade having at the pivoted end a concentric series of semi-crculargraduations, and having a marginal edge portion, the other blade having 'a semi-circular projection and a rear beveled 1 edge portion, a clamp pivotal connection for securing the blades together, a keeper at the i free ends of the blades, and a flange or base 15 projected laterally from one of the blades,

substantially as described for the purposes specified.

In testimony-whereof I'have signed this specification in the'presence of two subscribzo ing witnesses.

TIMOTHY FAHEY.

Witnesses:

P. F'. QUINN, THOMAS FAHEY.

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