US2761260A - Cutter blade holder during sharpening thereof - Google Patents

Description

p 1956 1. s. BARTO 2,761,260

CUTTER BLADE HOLDER DURING SHARPENING THEREOF Filed May 14, 1953 INVENTOR. 151W: 5. BARTO ATTORNEY United States Patent CUTTER BLADE HOLDER DURING SHARPENING THEREOF Isaac S. Barto, Williamsport, Pa.

Application May 14, 1953, Serial No. 354,970

1 Claim. (Cl. 51-224) This invention relates to a holder for use in the sharpening of tool blades on a grindstone, emery wheel or similar tool sharpening device, and has as its primary object the provision of a holder through the use of which straight cutting edges of the cutting blades of a tool can be quickly and accurately sharpened.

Another object of the invention is the provision of a device of the character described which is extremely simple of construction and therefore comparatively cheap of manufacture, yet highly efficient and durable in operation.

A still further object of the invention is the provision of a holder which can be quickly and readily attached to or associated with the conventional tool rest ordinarily found on grindstones and emery wheels as now manufactured and in use.

Other objects, as well as advantages, of the invention will appear from the following description when read in the light of the accompanying drawings in which an embodiment of the inventive concept is illustrated in combination with a grinding wheel.

In the drawings:

Fig. 1 is a top plan view of the invention.

Fig. 2 is a vertical transverse section on the line 22 of Fig. 1 looking in the direction indicated by arrows.

Fig. 3 is a fragmentary vertical sectional view on the line 3-3 of Fig. 1 looking in the direction indicated by arrows, and

Fig. 4 is a perspective view of a conventional power driven grinding wheel.

With reference to the drawings in which like parts are designated by similar reference numbers and characters throughout the description, and having reference particularly to Fig. 4, A is a motor for driving the grinding wheel 1. This motor can be suitably secured to a bench 2 or the like by a cradle 3. Such grinding wheels are conventionally furnished with a tool rest B which is provided with a slot 4 by which the rest arm 5 of the rest can be selectively adjusted towards and away from the grinding wheel. To enable the association of the present tool blade holder with such a conventional grinding or sharpening apparatus it is necessary only to drill the tool rest arm 5 to provide therein an opening 6.

By reference now to the other figures of the drawing, C is a table or base which can be made of any desired material and is substantially rectangular in configuration. Intermediate its length the table is provided with a wing nut bolt 7 which extends through the opening 6 in the grinding wheel tool rest arm 5. The wing nut 8 preferably tightens down against a lock washer 9 below the tool rest arm.

As will be seen in Fig. 2, the table has its inner side 10 closely associated with but in spaced relationship to the grinding wheel 11. At this edge the table throughout its length is provided with a guide bar D which is stamped or bent from metal to provide a horizontal leg 12 which 'ice is suitably secured to the top 13 of the table by screws 14 or the like and a vertical leg 15.

The tool to be sharpened is illustrated as a chisel E the blade 16 of which is provided with the conventional beveled cutting edge or end 17. The blade of the chisel illustrated has straight side edges 18 and 19 but it is to be understood that many chisel blades have their edges disposed at an inclination, and this is true also of the blades of other cutting tools.

The blade to be sharpened, whether it be the blade of a chisel, a plane or the cutting blade of some other cutting tool, rests upon the upper surface or face of the carriage F and is adjustably secured thereto by an elongated bar clamp 20, the ends of which are clamped down upon the blade by the wing nut bolts 21 and 22 which pass through the clamp bar and the carriage. The carriage throughout the length of its inner edge is bent downwardly to provide a leg 23 which when the device is in use, lies behind the guide bar leg 15, as clearly appears in Fig. '2. The carriage at its outer edge is bent under and backwardly upon itself as at 24 and terminates in a downwardly extending short leg or flange 25 which extends throughout the length of the carriage.

The height of the leg 25 in respect to the height of the leg 15 of the guide bar is such as to give to the blade 16 of the chisel the proper inclination to the horizontal to agree or coincide with the bevel or angle 17 of the blade so that the blade is presented properly to the grinding wheel 11 of the sharpening operation.

It is essential that the straight edge end 26 of the blade be presented square to the grinding wheel and to assure this the carriage is provided with an adjustable blade positioner G. This comprises a horizontal leg 27 which rests fiat upon the upper face of the carriage and at its end is provided with a leg or abutment 28 which engages one side 18 of the blade. The positioner is provided with an elongated slot 29 through which extends the wing nut bolt 30 by which it is possible to move the positioner toward and away from the blade and to also swing the positioner so that its leg or abutment 28 can accommodate itself to a blade the sides of which are at an inclination rather than straight in respect to its straight cutting edge 26. Through the instrumentality of this positioner the blade to be sharpened can be assuredly squared with the grinding wheel.

In operation: The blade is squared with the grinding wheel by proper adjustment of the positioner G and then is clamped against movement by the clamp bar 20. This is clearly illustrated in Fig. 1 wherein it will be seen that i the blade end to be sharpened extends well outwardly beyond the carriage so that it Will engage the grinding wheel, as illustrated in Fig. 2. The carriage is free to slide along the table or base C so that the blade is moved transverse the grinding edge of the grinding wheel. Throughout this movement and at all times a rearward or outward pressure is exerted upon the carriage through the blade or the handle thereof, with the result that the guide D in combination with the inclination of the carriage properly presents the blade at all positions to the grinding wheel for accurate sharpening thereof. The guide bar assures that the blade moves in a straight line across the grinding surface of the grinding wheel.

With the exception of the wing nut bolts, all parts of the device can be fabricated by a stamping or bending process which makes it possible to manufacture the device at a comparatively small cost. The device itself is simple of construction and composed of a minimum number of parts the nature of which is such that there is practically no upkeep thereon, making the device very durable in use. With the device a blade can be quickly and accurately sharpened, which fact would tend to make work- 3 men keep their cutting tools in highly efficient condition, thus assuring efiiciency in their work.

Departures from the specific construction illustrated and described can, be made without departingfronr the inventive concept, and the invention is accordingly to be limited. onlyby the. terms of the following claim.

, What I claim is:

In an apparatus of the characterdescribeia grinding wheel, ajhorizontally disposed table having an inner .side positioned ,closely adjacent, and extending transverse. the peripheral. grinding surface of the grinding Wheel, an upwardly extending guide bar extending along andclosely adjacent the inner side of the table, a carriagehayingan inner side restinguponthe top of the guide barand: provided with a downwardly extendingflange disposed behind the guide bar, the carriage extending outwardly and downwardly frQmv theguide bar, therouter side ofthe carriage heingproyided with a, supporting leg resting on the table top,;the carriage being freely .slidable along the guide bar and table top,jthe carriage adjacent one of its, endsbeing provided 'with 7 an upwardly extendingthreaded .bolt provided with,a thumb nut, a cutting blade positioner plate resting on thecarriage ,top and beingprovided withan elongated slot and also being provided at one of its ends with an upwardly extending flange, said bolt extending through said slot, the positioner plate being selectively swingable about the bolt and slidable toward and away from a side of the blade for positioning the flange of the plate in abutment with the side of the blade, and means to clamp a cutting blade to the top of the carriage with a side of the blade in abutment with the flange of the positionervplate and with the cutting. edge of-the-blade in contact with the peripheral grinding surface of the grinding wheel.

='References Cited in the fileof this patent UNITED STATES PATENTS 354,690 Cleary Dec. 21, 1886 1,872,096 Runshang W Aug. 16, 1932 1,915,247 Holloway et al. June 20, 1933 230,08 ,943 Bodey July 23, 1935 2,458,347 'Christiansen Jan. 4, 1949 72,565,291 Amendola Aug. 21, 1951 -2;636,326 Rivard Apr. 28, 1953

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