US2124878A

US2124878A - Knife sharpener

Info

Publication number: US2124878A
Application number: US34939A
Authority: US
Inventors: Hammond Grant
Original assignee: Individual
Current assignee: Individual
Priority date: 1935-08-06
Filing date: 1935-08-06
Publication date: 1938-07-26
Anticipated expiration: 1955-07-26

Description

July 26, 1938. G, HAMMOND 2,124,878

KNIFE. SHARPENER Filed Aug. 6, 1955 Illlllllllllllllm Patented July 26, 1938 1.

UNITED STATES PATENT OFFICE KNIFE SHARPENER Grant Hammond, New Haven, Conn.

Application August 6, 1935, Serial No. 34,939

` Claims.

My invention relates to the class of devices for sharpening knives, Yand an object of my invention, among others, is the production of a sharpening device for this purpose that shall 5 be simple in construction and particularly eiiicient in operation.

One form of a Sharpener embodying my invention and in the construction and use of which the objects herein Set out, as well as others, may be attained is illustrated in the accompanying drawing in which Figure 1 is a side View of my improved sharpener.

Figure 2 is an end View showing the application of a knife thereto in the 4Sharpening operation.

Figure 3 is a top View.

Figure 4 is a View in central crosswise section. Figure 5 is a View in central longitudinal Section.

Figure 6 is a top view showing the operation v of sharpening a knife.

Figure 7 is a detail view on enlarged scale showing the Sharpeners and their relative locations.

In the operation of cutting meat, butchers require a knife with an extremely keen edge and at the present time the operation of sharpening a butcher knife, often by 'grinding requires eX- pert handling. By the use of my improved sharpening device a keen edge may be applied to a butcher knife without requiring any particular expert qualifications, such lSharpener being shown in the accompanying drawing in which the numeral 8 denotes the block of my improved Sharpener having a Slot 9 extending across it at about its lengthwise center. This slot is for the purpose of receiving the edge of the knife and also for receiving the material removed from Such edge in the Sharpening operation. This block may be hollowed out and provided with a chamber I0 if desired, the Slot 9 cutting across Such chamber, and as shown in Fig. 5 of the drawing. .15 A pair of Sharpeners II is pivotally attached to the block near each end thereof, and as Shown in Fig. 3 of the drawing, the pivot screws I2 passing through ythe Sharpeners near their outer ends. The inner or cutting ends of the Sharpeners are serrated or provided with cutting teeth I 4 the edges of which are beveled so that they converge downwardly, as shown in Fig. 1, this convergence providing sharpening notches I5 between the meeting edges of the Sharpeners. The teeth I4 also intermesh, as

(Cl. 'Y6-86) shown in Fig. 7. The teeth are also formed on a curve, the arc of which is Struck from the center of the pivots I2 so that aS the Sharpeners II are rotated on their pivots the teeth will intermesh from one edge of each cutter or Sharpener to its opposite edge and will also maintain the same cutting formation on the cutter irrespective of its position. An important feature of the invention resides in the arrangement of the teeth I4 which are formed or extend on the radius of a circle having the axis of the pivots I2 as their centers.

The Sharpeners are normally yieldingly held in a mid-position as Shown in Fig. 3 of the drawing. In the structure herein shown they are squared at their outer ends as at I6, and springs Il are secured to the block preferably in a 'groove I8 as by means of screws or other suitable fastenings. These springs are of considerable width and press against the Squared ends of the In the operation of Sharpening a knife blade 20 it is placed in the notch I5 and is then drawn or pushed toward one side of the block, as Shown in Fig. 6, the springs II exerting a resistance to Such movement. Under the application of proper pressure this resistance may be Suicient to permit the blade to move relatively to the Sharpeners and at the same time cause them to rotate on their pivots. A little practice will enable this action to be acquired. When the Sharpeners reach their extreme lateral movement the guides will stop such movement and the blade may be drawn or pushed until it is freed from the Sharpeners. It will usually be found that two or three applications in this manner will suffice to produce an extremely keen edge upon a comparatively dull blade.

It will be understood that the Sharpeners, partieularly as to the cutting ends, will be composed of material of suitable hardness to produce the cutting results such material, as nitrided steel, being readily obtained for the purpose.

By the use of my improved device a butcher may readily produce a very keen edge upon a butcher knife and with little effort and no particular skill and it will therefore not be required to employ the services of an expert grinder, as is the practice at the present time, to place a proper edge upon the blade.

In accordance with the provisions of the patent statutes I have described the principles of operation of my invention together with the device which I now consider to represent the best embodiment thereof; but I desire to have it understood that the device Shown is only illustrative and that the invention may be carried out by other means and applied to uses other than those above set out.

I claim: y

l. A sharpening device including a block, a sharpener pivotally attached to said block and having a cutting end movable on said pivot in the direction of lengthwise sharpening movement of an article during .a sharpening operation, means cooperating with said end to support said article for application of pressure thereto, and means for resiliently resisting pivotal action of said Sharpener during the swinging sharpening movement.

2. A sharpening device including a block, a Sharpener pivotally attached to said block and having a cutting end movable on said pivot in the direction of lengthwise Sharpening movement of an article during a sharpening operation, means cooperating with said end to support said article for application of pressure thereto, said means and said end having cutting teeth, and means for resiliently resisting pivotal action of said Sharpener during its swinging sharpening movement caused by lengthwise movement of the article between said Sharpener and supporting means.

3. A sharpening device including a block, a pair of Sharpeners each pivotally attached to said block and having a cutting end, the pivot being disposed to effect pivotal action of the Sharpeners in the direction of lengthwise sharpening movement of an article during a sharpening operation, cutting elements formed on the ends of said Sharpeners to receive pressure of the article being sharpened, said Sharpeners being shaped to create a notch between them, and means for resiliently resisting pivotal action of said Sharpeners during their swinging sharpening movement caused by lengthwise movement of Said article between them.

4. A sharpening device including a block, a pair of Sharpeners pivotally attached to said block and having curved ends provided with cutting elements to receive pressure of an article being sharpened and to support Said article to maintain its Contact with said Sharpeners during sharpening movements, said pivots being disposed to effect swinging movement of said Sharpeners in the direction of lengthwise sharpening movement of said article during a sharpening operation, and means for resiliently resisting pivotal action of said Sharpeners during sharpening operations.

5. A sharpening device including a block, a pair of Sharpeners pivotally attached to said block and having intermeshing toothed ends comprising cutting elements, said pivots being disposed to effect swinging movement of said ends in the direction of lengthwise sharpening movement of an article during a sharpening operation and said ends being shaped to form a notch between them, and means for resiliently resisting pivotal action of said Sharpeners while permitting swinging pivotal movement thereof.

6. A sharpening device including a block, a pair of Sharpeners pivotally attached to said block and having squared ends, said pivots being disposed to effect swinging movement of said ends in the direction of sharpening movement of an article during a sharpening operation, and springs effecting pressure against said squared ends and toward the opposite ends of the sharpeners to hold them in a central position, the opposite ends ofsaid Sharpeners being supplied with cutting elements.

'7. A sharpening device including a block, a pair of Sharpeners pivotally attached at their opposite ends to said block and having the opposite adjacent ends supplied with cutting elements, said cutting elements being formed on arcs of circles having said pivots as their centers and said cutting elements intermeshing each with the other, guides for directing reciprocating movement of said Sharpeners, and springs arranged to resiliently resist movement of said Sharpeners from their central positions with respect to Said lateral movement.

8. A sharpening device including a block, a pair of Sharpeners pivotally attached at their opposite ends to said block and having the opposite adjacent ends supplied with cutting elements, said cutting elements being formed on arcs of circles having said pivots as their centers, and said cutting elements intermeshing each with the other, ,and springs arranged to resiliently resist movement of said Sharpeners from their central positions with respect to lateral movement.

9. A sharpening device including a block, a pair of Sharpeners pivotally attached at their opposite ends to said block and having the opposite ends supplied with cutting elements, said cutting elements being formed on arcs of circles having said pivots as their centers, guides for directing reciprocating movement of the sharpeners, and springs arranged to resiliently resist movement of said Sharpeners from their central positions with respect to lateral movement.

10. A sharpening device including a block, a Sharpener pivotally attached to Said block on a pivot disposed to effect swinging movement of the cutting end of the Sharpener in the direction of lengthwise sharpening movement of an article during a sharpening operation, Said Sharpener having cutting teeth on said end extending on the radius of an arc having said pivot for its center, means cooperating with Said end to receive pressure of a blade therebetween during the sharpening operation, said Sharpener having a pivotal action during such operation and the teeth being disposed substantially at right angles to the direction of movement of the article being sharpened, and means for resiliently opposing pivotal action of said Sharpener during the sharpening operation.

GRANT HAMMOND.