US390470A - Combined try-square and device for laying out angles - Google Patents

Description

(No Model.)

P. L. FOX.

COMBINED TRY SQUARE AND DEVICE FOR LAYING OUT ANGLES. No. 390,470 Patented Oct. 2,4888.

PHILO L. FOX, OF BRIDGEPORT, CONNECTICUT.

COMBINED TRY-SQUARE AND DEVICE FOR LAYING OUT ANGLES.

SPECIFICATION forming part of Letters Patent No. 390,470, dated October 2, 1888.

Application filed April 10, 1888. Serial No. 270,178. (No model.)

To aZZ whom, it may concern.-

Be it known that I, PHILo L. FoX,a citizen of the United States, residing at Bridgeport, in thecountyof Fairfield and State of Connecticut, have invented certain new and useful Iniprovements in Combined Try-Square and Device for Laying Out Angles; 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.

My invention has for its object to produce a tool for carpenters and for general use,which, while adapted to all of the uses of an ordinary try-square, shall be especially adapted to the laying out of angles other than right angles as, for example, in indicating the pitch of roofs.

With this end in View I have devised the simple and novel tool of which the following description, in connection with the accompanying'drawings, is a specification, numbers being used to denote the several parts.

Figure 1 is a plan View showing the man ner in which my novel tool is used to lay out angles of a definite pitch; Fig. 2, a back view corresponding therewith and showing the gage,- and Fig. 3 is a view illustrating the use of the tool as a bevel.

It will thus be seen that I combine in one tool the functions of a try-square, adevice for laying out definite angles, and also an ordinary bevel.

1 denotes the blade,which is widened at the rear end and provided with a slot, 2, and is also provided with a hole, 3, to adapt the device for use as a bevel.

4 denotes the handle, which may be made of metal, wood, or any suitable material. WVhen not made of metal, I preferably provide it with a face-plate, 5.

6 denotes a bar having aslot, 7, to receive the blade, and holes 8 and 9, for attachment, respectively, to slot 2 and hole 3 in the blade by means of a set-screw, 10, the head of which is preferably provided with a hole, 11, to receive a nail or piece of wire, by which it is turned in adjusting.

12 denotes a gage on the back of bar 6, the marks of which are adapted to register with the lower edge of the rear end of the blade and indicate the rise per foot of an angle laid out at the special adjustment at which the bar may be set.

It is of course well understood that carpenters use the terms six-inch pitch, nine inch pitch, 850., to denote the number of inches rise in each linear foot, the common way being to speak of a six-inch rise as a half pitch, a nine inch rise as a three quarter pitch, a twelve-inch rise-in other words, a perfect right ang1e--being called a full pitch.

The operation is as follows: Suppose that it is desired tolay out a definite angle in carpentry-for example, the pitch of a roof in cutting the end of arat'ter. The set-screw which passes through hole 8 in bar 6 and slot 2 in the blade is loosened and the bar is set so that the de sired rise per foot is indicated by gage 12. The set screw is then tightened to lock the bar in position. Angles are laid out by placing the upper inner corner of the handle (denoted by 13) and the upper end of the bar (denoted by 14.) against the side of the piece to be marked. The outer edge of the blade will then indicate the desired angle. The dotted lines in Fig. 1 indicate the side of the piece against which points 13 and 14 are placed in laying out an angle. The upper end of the bar is preferably rounded, as shown, for convenience both inlaying out definite angles and in using the bar for a bevel. When used for the latter purpose, the setscrew is passed through hole 9 in bar 6 and through hole 3in the blade, as shown in Fig. 3. The dotted lines, as in Fig. 1, denote the side of the piece to be marked against which thebar is laid. The blade may then be turned in either direction, as indicated by dotted lines in Fig. 3, and any possible angle may be laid out,the same as with an ordinary bevel.

Having thus described my invention, I claiml. A try-square the blade of which projects back from the handle and is provided with a slot, 2, a bar slotted to receive the rear end of the blade, and a set-screw passing through the bar and the slot, whereby the bar may be locked at any desired adjustment, as and for the purpose set forth.

2. A try-square the blade of which pro jects back from the handle and is provided with a slot, 2, a bar, 6, slotted to receive the blade, a set-screw passing through the bar and through the slot in the blade, and a gage on the back of the bar which registers with the lower edge of the blade, whereby the bar i may be adjusted so that the outer edge of the blade will lie at any desired angle to aline inceive the blade and adapted to be secured thereto by a set-screw passing through said slot orsaid hole, whereby the tool is adapted v to lay out definite angles or to serve the pur- I5 pose ofa bevel.

In testimony whereof I affix my signature in tersecting points 13 and 14 on the handle and presence of two witnesses. bar, respectively.

3. A try-square having a blade projecting backward from the handle and provided with a slot, 2, and a hole, 3, and abar slotted to re- PHILO L. FOX. Witnesses:

A. M. WOOSTER, BERTHA E. LEE.

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