US289463A

US289463A - Bevel

Info

Publication number: US289463A
Authority: US
Publication date: 1883-12-04
Anticipated expiration: 1900-12-04

Description

(No Model.)

L. s. STARRBTT;

REVEL.

No.1289,463. Patented Deo. 4, 1883.v

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man STATES iPATENT @Prina Bevel..

SPECIFICATION forming part of Letters Patent No. 289,463, dated December 4, 1883.

Application filed October :24, 1883. (No model.)

To all whom, it mf/,y/ concern:

Be it known that I, LAROY SUNDERLAND STARRETT, of Atho1,in the county of Worcester, of the Commonwealth of Massachusetts, have invented anew and useful Improvement in Beveling-Instruments; and I do hereby declare the same to be described in the following specification and represented in the accompanying drawings, of which- Figure l is a front elevation, Fig. 2 a rear view, and Fig. 3 avertical, central, and transverse section, of a beveling-instrument provided with my invention7 the nature of which is defined in the claims hereinafter presented.

Fig. 4 is an edge view of the revoluble or rotary limb as grooved on its face to receive the valve. Fig. 5 is a similar view of the rotary limb as recessed or rabbeted to receive the ruler. v

In the drawings, A denotes the stock ofthe instrument, it being provided with a straightedge, a. Vithin and extending through the stock is a. circular aperture or socket, b, for reception of a rotary circular limb, B, having marked on one face of it divisions of the arc of a circle, as shown at C. This aperture is rabbeted,l as shown at c, to receive a corresponding-shaped flange, d, extending from the periphery of the limb. A screw, d, arranged so that it shall lap upon the limb, is screwed into the stock, and with a clamp-screw, D, also screwed into the stock and provided with a metallic washer, c, 'serves to hold the limb and allow of it being revolved within the stock. The limb is grooved or rabbeted across its divided face and below the arc of divisions, such arc being semicircular, and having marks or figures to show the number of degrees of a `semicircle,the zero-mark being set at the middle of the are, and each tenth division being numbered therefrom in manner as represented. The groove or rabbet f of the limb has its bottom iiush with the divided arc of the limb and the front face of the stock, and is of the same or about the same depth as that of a straight ruler, E, arranged within it. In case of the limb being grooved to receive the ruler, thelatter will bear against and be supported by both edges of the groove, as the groove is of the same width as the ruler; but in case of the limb being rabbeted the ruler 4 at one edge of it will bear against the edge ofthe rabbet. In each case the limb is provided with a screw, F, which screws into it and against a metallic washer, h, that overlaps the ruler, as shown, such screw being to clamp the ruler in the groove or rabbet. I very much prefer to have a groove instead of a rabbet in the rotary limb, as the former supports the ruler to better advantage. rIhe groove affords two straight-edge bearings to the ruler, while the rabbet presents to it but one of such bearings. The clamp-screw not only operates to hold the ruler in place or against the edge bearing or bearings, butto force it down upon the bottom of the groove or rabbet or face of the rotary limb.

Heretofore in making beveling-instruments of thekind I have had the rotary limb grooved edgewise to receive the ruler, and in the latter I have had a groove lengthwise of it to receive a hooked screw, all being as represented in the drawings of the United States Patent No. 282,583, granted to me. My present improvement saves not only the groovings of the ruler and the employment therewith of a hooked clamp-screw and a nut thereto, but the extension of the limb across the front face ofthe ruler to cover up more or less of its divisions. Vith my present improvement none of the divisions or marks at or near the lower edge of the rule and few, if any, of those at or near t-he upper edge of it are covered, such being of advantage.

In i the beveling-instrument, therefore, I claiml. The divided rotary limb recessed across its face, so as to bear against but one only of the two opposite sides of the ruler, and provided with means of clamping the ruler to it (the said limb)\in combination with and arranged in the straight-edged stock, substantially as set forth.

2. The divided rotary limb recessed across its face, so as to bear against but one side and the two opposite edges of the ruler, and provided with means for clamping it (the said limb) to 'the ruler, in combination with and arrangedin the straight-edged stock, substantially as set forth.

3. The divided rotary limb arranged within the straight-edged stock, and having not IOO 1o clamping screws therefor, essentially as described, Witli the said limb recessed so as to receive the straight ruler and bear against but one of two opposite sides and one or both of the edges of it, and provided with means of clamping the ruler to the bottom of the groove 1 5 or recess, all being substantially as set forth.

LAROY SUNDERLAND STARRETT. Vitnesses:

R. H. EDDY, S. N. PIPER.