US919976A - Sharpening device. - Google Patents

Description

A. J. STURM. SHARPBNING DEVICE. APPLIoAIoN'rILBD AUG. 25, 190e.

919,976. Patented Apr. 27, 1909.

WJTNESSES l .NI/ENTOR ALEXANDERJ. STURM, OF STRATFOREWISCONSIN 4sHARrnNrive DEVICE.

Specification of Letters Patent.

Patented April 27, 1909.

Application filed August 25, 1908. Serial No. 450,145.

To all 'whom it 'may concern:

Be it known that I, ALEXANDER J STURM, a citizen of the United States, residing at Stratford, in the county of Marathon and State of Wisconsin, have invented certain new and useful Improvements in Sharpening Devices; and I do ereby 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. i

My invention relates to new and useful improvements in sharpening devices and more whereby the thickness of the cutting edge may be varied anda still further object is to provide means for securing the sharpening device to a suitable support.

Other objects and advantages will be here-V inafter referred to and more particularly pointed out in the claim.

In the accompanying drawings which are made a part of 'this application, the iigure is a erspective view of t e invention.

eferring to the drawings in which similar 4 reference numerals designate corresponding parts throughout the several views, 1 indicates the base of my improved sharpening device, said base having vertically extending end sections 2 and the u per ends of the end sections having inward y extending terminals 3, which terminals are dis osed in a plane above and parallel with t e base l. The meeting ends of the terminals 3 are spaced apartso that a knife or similar object may be introduced between the ends of the terminal and into engagement with sharpening plates 4.

The plates 4 are placed edgewise between the terminals 3 and base 1, the loweredges of the plates 4 being entered in a channel plate 5 fixed to the base 1, while the upper edges thereof are engaged by the lower face of the terminals 3 and in order to hold the plates 4 in their. fixed ositions, binding screws 6 are introduced t rough the terminals 3 and threaded into the base, said screws, 4when properly adjusted, forcing the terminals into engagement with the lates 4 with sufficient pressure to lhold the p ates in their adjusted positions.

The side walls of the channel late 5 are inclined, sov that the plates 4 may e tilted to various rangles and thereby form cutting edges on the tool of varying thicknesses and in order to cause the terminals to positively engage the upper edges of the plates 4, the meeting edges of the terminals are curved, said curvature co-inciding to the swinging radius of the plates 4.

The Sharpener is secured to any suitable form of support by fixing bars 7 to the base 1, the ends of the bars extending 'beyond each edge of the base, through which are disposed bolts or screws 8 and by which means the bars arel securely clamped to the supporting object.

-The faces of the plates 4 are preferably milled or roughened, or said lates may consist of sections of files, the milled surfaces of the plates serving to remove portions of the metal constituting the blades of the tools and thereby forming a sharp edge on the tool and the extent of the cutting edge may be readily governed by the inclination of the plates, as should a more or less keen cutting edge be desired, the upper edges of the plates 4 are moved closer to each other, while if an abrupt cutting edge is desired, the upper edges of the plates are to be separated a greater' distance than when a keen edge is desired and by milling both faces of the plates, said plates may be reversed and the ife of the plates greatly enhanced.

In view of the extreme simplicity of my improved device, it can be very cheaply constructed and the sharpening plates can be renewed from time to time at a very nominal cost and it will further be seen that by securing the plates in position as shown, the extent ofthe cutting edge ofthe tools may be varied at will; v

What I claim is:

A device of the character described, comprising a spring holder having arranged centrally therein a channel late with u wardly and outwardly inclinedp walls, said) holder having its terminal portions formed in segmental outline,

edges, duplicate edgewise arranged sharpenwith opposed spaced apartV ing plates, the lower ends of' which are rel In testimony whereof l have signed my oeived by said channel plete and their upper naine to this speoiiieation in the presence of ends engaged by the segmental portions of l two subscribing Witnesses.

said holder, said holder also being ,equipped l ALEXANDER J. STURM. 5 with holding screw bolts for the effective rel YWitnesses:

tention of said sharpening plates in position M. J. CURTIN,

in said holder. HARRY A. CURTIN.

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