US594873A - Douglas stanley hewitt - Google Patents

Description

(No Model.)

B. s. HEWITT. COMBINED SQUARE AND BEVEL.

No. 594,873. Patented Dec. 7, 1897 m "mum! "Willllll Hill *mm mm" 1 WWW mtfiesse Even 6 a I ag UNITED STATES PATENT OFFICE.

DOUGLAS STANLEY HEWITT, OF TORONTO, CANADA.

COMBINED SQUARE AND BEVEL.

SPECIFICATION forming part Of Letters Patent No. 594,873, dated December7, 1897.

Application filed January 8, 1897. Serial No. 618,482. (No model.)

' To all whom it may concern:

Be it known that I, DOUGLAS STANLEY HEWITT, of the city of Toronto, in the county of York, in the Province of Ontario, Canada, have invented a certain new and useful Oombined Square and Bevel; and I hereby declare that the following is a full, clear, and exact description of the same.

This invention relates to a combined square and bevel and the objects of the invention are to adjustably unite together the tongue and blade in such a manner that they can be readily set at any desired angle to each other to permit of the instrument being employed either as a square or a bevel, to provide the instrument with a protractor to accurately specify the angle at which the tongue and blade are set to each other, and to so arrange the joint between the tongue and blade that when the instrument is employed as a square the angle can be described from either the inside or outside edges of the instrument, the whole device being hereinafter more fully set forth and more particularly pointed out in the claim;

In the drawings, Figure 1 is a view of a portion of the instrument, showing the tongue closed against the blade. Fig. 2 is a similar view showing'the tongue set at an angle of ninety degrees to the blade. Fig. 3 is a plan View of the male portion of the hinge, showing it connected to the tongue. Fig. 4 is a View of the female portion of the hinge, showing it connected to the blade. Fig. 5 is a sectional view of the hinge.

Like letters of reference refer to like parts throughout the specification and drawings.

A represents the blade, and B the tongue, of the instrument, each of which has indicated on it the usual measures or scales commonly used.

O represents the female hinge, formed integrally with or rigidly connected to that end of the blade A adjacent to the tongue B, while D represents the male hinge, similarly connected to the adjacent end of the tongue B. I prefer tomake the hinges integral with their respective parts, but I may, if I so desire, make them separate and then rigidly connect them to their respective parts. The inner edge 0 of the female hinge 0 forms part of the edge of the blade A. Passing through the and consists of two flat plates or a.

hinge O is semicircular-shaped, the curve of which is struck with the center of the pivot pin or screw E as its center and the distance from the said center of the pivot pin or screw to the adjacent end of the blade-A as its radius. The curve of the outer edge 0 is continued as far as possible under the pivot pin or screw E in. order that a, shoulder F may be provided on the blade A for the end of the adjacent arm I) of the tongue B to abut against. The shoulder F is provided with a groove f to receive a tenon f at the adjacentend of the tongue B. By the insertion of the tenon f into the groove f the surfaces of the tongue and blade can be kept in perfect alinement. The tongue B, it will be noticed, is L-shaped, and in the angle formed by the long arm I) and short arm b is milled out a curved seat G for the female hinge O, the curvature g of the seat G corresponding with the curvature of the outer edge e of the female hinge O in order that when the blade and tongue are being set the outer edge of the female hinge will bear against the said seat, causing the smooth working and preventing the displace ment of the parts.

By reference to the drawings it will be noticed that the female hinge O is bifurcated The male hinge D, it will also be noticed, consists of a flat plate adapted to be inserted between the forks of the female hinge. Passing through the female hinge O and male hinge D is a pivot pin or screw E, which revolubly unites these parts together and permits of the tongue and blade being set at any desired angle to each other. The end of the inner edge 0 of the female hinge O abuts against the shoulder.

II, formed in the tongue B, when the tongue and blade are set at an angle of ninety detively rigid square and allowing the angle to be defined either from the outside or inside edges of the instrument.

To more firmly unite together the blade and tongue, I find it advisable to form in the male hinge D a slot I, concentric with the seat G, and to pass through the female hinge and slot I a set-screw J, by means of which any required clamping pressure can be placed on the forks a, a of the female hinge.

Formed on the tongue B contiguous to the seat G is a protractor K, and formed on the female hinge O is an indicator L. By means of the protractor and indicator it is possible to readily determine the angle at which the tongue and blade are set to each other. I do not confine myself to placing the protractor on the tongue and the indicator on the blade, as I may reverse this construction, if desired.

Again, by reference to the drawings it will benoticed that theinner end of the inner edge of the arm bis curved inwardly to meet the inner edge of the arm I), the curve having at its center the center of the pivot pin or screw E. The purpose of this construction is to permit of a proper delineation of the angle when the'instrument is used as a bevel.

Having thus fully described my invention, What I claim as new, and desire to secure by in alinement with the inner edge of the short arm, a tenon formed on the end of the short arm contiguous to its outer edge, in combination with the blade, having a semicircularshaped end fitting the countersunk seat, a pivot-pin passing through the blade and pivothole, a shoulder on the blade to engage the end of the short arm of the tongue, and having a groove to receive the tenon, the inner edge of the end of the blade engaging the" shoulder in the long arm ofthe tongue, when the blade and tongue are set at right angles,

and a clamping-screw passing through the blade and curvilinear slot, substantial ly as specified.

Toronto, December 29, A. D. 1396.

DOUGLAS STANLEY HEWITT.

In presence of N. O. WEsTWoon, C. H. RICHES.

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