US458359A

US458359A - Drill-gage

Info

Publication number: US458359A
Authority: US
Publication date: 1891-08-25
Anticipated expiration: 1908-08-25

Description

(No Model.) f A W. A. GROPPER & J. A. LONIE. .DRILL GAGE.

No. 458,359. Patented Aug. 25, 1891.

'%M%% wa.

I THE mm pgnns co mum-1mm, wAsmncn-ou, n. c.

UNITED STATES PATENT OFFICE.

\VI LLIAM A. CHOPPER AND JOHN A. LONIE, OF BOSTON, MASSACHUSETTS.

DRILL-GAGE.

SPECIFICATION forming part of Letters Patent No. 458,359, dated August 25, 1891.

Application filed January 27, 1891. Serial No. 379,254. (No model.)-

To all whom it may concern:

Be it kn own that we, WILLIAM A. CROPPER and JOHN A. LONIE, of Boston, in the county of Suffolk and State of Massachusetts, have invented a new and Improved Gage for Usein Grinding Drills, of which the following is a specification.

In grinding (for sharpening purposes) drills such as are used in drilling metal it is extremel ydiiiicult to grind the two lips equally- -z'. e., so that they are of equal length. As, it the lips are not alike, the hole made by the drill will be too large, owing to the fact that one lip cuts away more stockthan the other, It is important that some device should be employed to accurately gage the lips.

The accompanying drawing is a view or elevation showing a drill with our gage applied thereto, a small portion of the latter being broken out.

A represents an ordinary drill, such as is used in operating on metal, and a a are the lips, which are ground from time to time as needed.

B is a long metallic rod bent back upon itself ait B, with its upper or hooked end pointed, as shown at 6.

LC is a sliding block perforated to receive the rod B, and held in any desired position on esaid rod by the set-screw D.

E is an indicating gage or pointer integral with the slide C and extending therefrom at right angles with the rod B and pointed at its outer end E.

To gage the lips a, the drill A is held in one hand and the pointed end I? dropped into the small depression which is alwaysfound in the upper end of a drill By adjusting the block 0 on the rod D the drill may be turned and the two lips to presented in turn to the point E of the pointer E and their accuracy tested.

Having thus fully described our invention, What we claim, and desire to secure by Letters Patent, is

The herein-described gage for use in grinding drills, consistingof the integral rod B, bent back upon itself at B and pointed at its upper end I) to engage in the depression in the upper end of the drill, and the slide C, provided with the pointer E, pointed at its outer end E for gaging the lips of the drill, said slide being adjustably secured to the rod, sub stantially as set forth.

\VILLIAM A. OROPPER. JOHN A; LONIE.

\Vitnesses:

HENRY W. WILLIAMS, J. M. HARTNETT.