US2195129A - Beveled edge sharpener - Google Patents

Description

March 26, 1940. s. c. HOOD 2,195,129

BEVELED EDGE SHARPENER Filed Aug. 19, 1959 5AM UEL 6) H000 wan/awn 5. ATTORNEY.

Patented Mar. 26, 1940 [UNITED sTATEsIPATE T- OFF-ice Application August 19,

3 Claims.

This invention relates to blade sharpening devices, with especial reference to the blades of hand shears, scissors and the like, in Whichthe thin cutting edges of the blades are beveled i opposite directions.

To sharpen such blades the abrading tool, whether a file, stick of carborundum, emery, Whetstone, etc., mustbe operated at a proper oblique angle with reference to the inner, fiat surface of the blade or the results will be far from satisfactory; if applied at too great an angle thecutting edge of the shear blade becomes dulled, on the other hand if the angle is too acute, the blade is worn away unnecessarily and p its cutting edge weakened.

The correct bevel of such blades fore the abrading element should be adjustable; furthermore, the cutting edge must be maintained straight throughout its entire length or its appearance and operation both suffer.

It is therefore an object of this invention to provide a blade sharpening device including a block of abrasive material and a combined holder and guide adjustable at any angle relative to the blade.

A further. feature is in the provision of a blade sharpener easily operated by hand throughout the entire length of the blade, keeping the cutting edge straight and at such angle as .is most suitable for the work to be performed. f

Another purpose is to produce an essentially simple device, inexpensive to manufacture and readily used even by inexperienced persons.

These objects are accomplished by thenovel and practical construction and arrangement of few and simple parts hereinafter described'and illustrated in the accompanying drawing, constituting an essential component of this disclosure, and in which:

Figure 1 is a perspective view of a blade sharpener made in accordance with the invention, in.- dicating its application Figure 2 is an end elevational View thereof.

Figure 3 is a front elevational View of the same. 1 n a Figure 4 is a transverse sectional view showing the guides in different angular positions relative to the abrading element.

Figure 5 is a plan View of the guide blank. Referring in greater detail'to the drawing, a sheet of metal is stamped to produce a single unitary blank l5, substantially rectangular; in provaries in ac- 1939, SerialNo. 290,937

extend guide plates l1 shaped triangularly with their outer convergent edges convexly curved as shown.

At the ends of the opening l6 are narrow arms 1 l8 connected at their inner ends by circular bosses I9 having central perforations 2B.

"The bosses l9 are bent at a right angle to the plane of the guide plates l'l, into parallelism, by twisting the arms l8, bringing 'the perforations into alinement, centrally of and in the plane of the, opening l6. l

A block 22 of abradant material, of rectangular cross section, its width greater than the width of the opening I6, and its thickness considerably less, is formed with a central passage 23, the block closely fitting between the arms l8 and bosses l9. ,Passing through the opening 23 and perforations 20. is a bolt 25, one end having a head 26 and the other'screw threaded to receive a thumb nut 21, which upon being tightened on the bolt draws thebosses into clamping engagement with the ends of the block 22, holding it firmly in any I desired angular position relative to the guide plates.

' From the foregoing it will beseen that the ar- .the block on each of its two main sides into position for operation, as indicated best in Figure 4.

. 25' rangement is such as to present two portions of sure as may be required; the simplicity of construction and. operation is plainly apparent.

Obviously a file may be substituted for the 7 block 22, the arrangement being as described.

Although the foregoing is'descriptive of the best known embodiment of the invention, it is to be understood that all suchminor changes and unitary holder in which said element is pivotally mounted, means integral with said holder to guide. a blade presented against either side of said element; and means to clamp said element in an adjusted position.

2. A beveled. blade sharpener comprising an abrasive element of rectangular cross section having opposed fiat surfaces and a central passage extending longitudinally therethrough, a flat holder apertured to receive said element, blade guides integral with said holder, perforate bosses at the ends of said holder, and a bolt passing through said bosses and abrasive element whereby the latter may be clamped.

3. A beveled blade sharpener comprising a holder composed of a single piece of flat sheet metal having an elongated rectangular opening 10 in its central portion, opposed wing-like guides SAMUEL 0.11001).

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