Untitled record

Application filed .November 19,1880. , (No model.) . To all whom it may .concern:

Be it known that I, George Byron Kirkham, of 167 East Thirty-third street, city, county, and State of New York, have invented a 5 Try-Square or Bevel-Square, of which the following is a specification.

The object of my invention is to produce an adjustable try-square or bevel-square the blade of which can be placed in any position desired io and used either On square work or bevel work. This square differs from other try-squares and bevel-squares in this particular, that, whereas in most squares the binding-screw passes through both the blade and handle of the -, 15 square and pinches the shoulders of the handle i against the blade, in this square the screw only k passes part way through the handle, and the point of the screw presses against one side of an angular groove in the blade, forcing the 20 blade down against a shoulder in the handle to form a try-square, or the point of the screw presses against the blade simply to form a bevel-square.

In Figure 1, A is the body or handle of the ' ' -. 25 square, which has a slot cut in its upper end to hold the blade B, which moves freely in the slot, being held down against the bottom of the slot G by the thumb-screw E. The bottom of the slot has a curve in it, as shown by 30 the dotted line G. This curve enables the blade B to swing without striking its corners j when the instrument is used as a bevel-square;

also, it leaves a shoulder on each-side for the blade B to rest against, andthus be firmer aud truer when the tool is used as a try-square. 35 In the blade B an angular or curved groove, C D, is cut, and the conical point of the screw E presses against the side D when the screw is screwed in tight, thus forcing the blade down against the bottom of the slot G, and making 40 a solid try-square of it.

An end section of the blade B, with the angular groove, is shown at Fig. 2.

A side view of the thumb-screw E is shown at E', and when it is necessary to have the top 45 of the screw flush with the body A a screw made as represented at F can be used.

The groove O D is cut parallel to and near the upper edge of the blade B, and this enables the blade to swing around in a circle, as 50 shown at B' C D', and form a bevel-square, being held in any position that may be desired by the screw E or F.

The groove C D and point of E or F can be made rounding instead of angular, and work ςς equally well.