US2471699A - Device to form teeth in the edge of a knife - Google Patents

Description

May 31, 1949. PAVESI ET AL 2,471,699

DEVICE TO FORM TEETH IN THE EDGE OF A KNIFE Filed Feb. 5, 1947 2 Sheets-Sheet 1 I INVENTZORS. Lou/s Paves/ y Franc/s F. Roa'om @L' -wkr- May 31, 1949. PAVESI ET AL 2,471,699

DEVICE TO FORM TEETH IN THE EDGE OF A KNIFE Filed Feb. 5, 1947 2 Sh'eefs-Sheet 2 5 INI ENTQRS.

Lou/s Paves/ y Franc/s F. Rodon/ Patented May 31, 1949 OFFICE DEVICE TO FORM TEETH IN THE EDGE OF A KNIFE Louis Pavesi and Francis F. Rodoni, San Francisco, Calif.

Application February 5, 1947, Serial No. 726,708

4 Claims.

This invention relates to improvements in knife sharpening devices, and has particular reference to a device for forming teeth on the edge of a knife.

The principal object of this invention is to produce a device wherein teeth may be formed upon the opposite edges and ends of an ordinary table knife.

A further object is to produce a device of this character which may be used by an unskilled person with equally uniform results.

Another object is to produce a device of this character which is economical to manufacture, one which may be easily transported and one which is neat and attractive in appearance.

Other objects and advantages will be apparent during the course of the following description.

In the accompanying drawings forming a part of this specification and in which like numerals are employed to designate like parts throughout the same,

Fig. 1 is a perspective view of our device.

Fig. 2 is a top plan view of Fig. 1, having portions thereof broken away.

Fig. 3 is a front plan view of our device, having portions broken away.

Fig. 4 is a side elevation of a knife after the same has been edged in our device, and

Fig. 5 is a cross-sectional view taken on the line 5-5 of Fig. 2, and looking in the direction of the arrow.

An ordinary table knife, or so-called silver knife, is relatively dull and, therefore, cannot be used for the purpose of separating hard-to-cut food. It has heretofore been customary to pro vide sharp, steel knives, commonly termed steak knives, whenever such food is to be served. This requires not only additional equipment, as in restaurants and the like, but also requires extra handling, washing, etc.

Applicants have. therefore, devised a machine for the sharpening of the edges of silver knives, by forming teeth along the forward cutting portion of the knife so that the same will have a sawing effect, thereby eliminating the necessity for providing steel steak knives.

In the accompanying drawings wherein for the purpose of illustration is shown a preferred embodiment of our invention, the numeral 5 desi nates a base plate, having standards 6 and l. between which are parallel, tubular spacers 8 and 9.

Mounted substantially halfway between the spacers, and parallel thereto, is a toothed cutter in the form of a file ll of special construction, 1. e., the cutting portion of the toothed cutter or file is formed with diverging ridges extending from a medial line towards both ends of the file.

The file is preferably positioned on an angle and held in the uprights by screws l2.

Mounted upon the spacers 8 and 9 is a slider l3, which slider has a pin 14, which extends through a slot l6 into the upper spacer, the purpose of which will be later seen.

A similar pin I! extends through a slot l8 in the lower spacer 8.

In the upper spacer we place springs 19 and 2 l, against which the pin l4 may contact.

Positioned on the base 5 is a support 22, which has secured to its upper end a V-shaped knife gauge 23, which is adapted to be contacted by the end of the knife shown at A. The knife is angularly disposed and held to the slider l3 by a retainer 24 which hooks over the top of the knife. (See Figs. 1 and 5.)

The result of this construction is that when a knife is placed in the retainer, as shown in Fig. 1, the knife will be in edging position.

By now moving the knife as a whole toward the left of the drawing and bearing downwardly thereon, the blade will be brought into contact with the teeth of the file, and the tip of the knife will be guided along one side of the V-shaped knife gauge 23.

Consequently, the teeth of the file will move across the edge of the blade, thereby cutting teeth in the blade, the guide 23 assuring a uniform cross movement, so that if the knife is moved across the file several times it will always contact the same teeth of the file, thus increasing the depth of the tooth being cut.

By lifting the handle of the knife slightly a rocking motion will permit the teeth to be formed along the curvature of the knife, as shown in Fig. 4.

As the knife moves toward the left the pin 14 will tend to compress the spring l9, thus giving a slight resistance to the sidewise movement of the knife.

When it is desired to sharpen the opposite side of the knife the same is withdrawn and placed on the left side of the slider and the same general operation repeated.

It will thus be seen that we have produced a device which will accomplish all of the objects above set forth.

It is to be understood that the form of our invention herewith shown and described is to be taken as a preferred example of the same and that various changes relative to the material, size, shape and arrangement of parts may be resorted to without departing from the spirit of the invention or the scope of the subjoined claims.

Having thus described our invention, we claim:

1. In a device for cutting teeth along the edge of a knife-blade, an elongated cutter having oppositely diverging cutting ridges extending from a medial line toward the opposite ends of said cutter, knife positioning means mounted adjacent said cutter, and a gauge mounted parallel to the cutting ridges of said cutter whereby a knife in said positioner and abutting said gauge may be moved over said cutting ridges to form teeth therein.

2. In a device for cutting teeth in the edge of a knife, a cutter having diagonally positioned cutting ridges formed therein, a slider resiliently and slidably positioned parallel to said cutter, knife positioning means-carried on said slider, and a gauge having its end overlying said cutter and positioned. parallel to the cutting ridges of said cutter whereby a knife positioned in said positioner will engage the teeth of said cutter and be guided thereover.

3. In a device for cutting teeth on the edges of a knife, a base, a pair of standards mounted on said base, tubular spacers extending between .4 said standards, an elongated cutter positioned between said spacers, said cutter having cutting ridges formed thereon, said ridges diverging toward the opposite ends of said cutter from the medial line of said cutter, and a V-shaped gauge supported from said base and having its ends overlying said cutter, the ends being parallel to the cutting ridges of said cutter.

4. In a device for cutting teeth on the edges of a knife, a base, a pair of standards mounted on said base, tubular spacers extending between said standards, an elongated cutter positioned between said spacers, said cutter having cutting ridges formed thereon, said ridges diverging toward the opposite ends of said cutter from the medial line of said cutter, a V-shaped gauge supported from said base and having its ends overlying said cutter, the ends being parallel to the cutting ridges of said cutter, a slider mounted on said spacers and normally held adjacent the medial line of said cutter by opposing springs, and a knife positioner mounted on said slider and serving to position a knife angularly disposed with relation to the cutting surface of said cutter.

LOUIS PAVESI. FRANCIS F. RODONI.

No references cited.

Images