US649059A - Attachment for knives. - Google Patents

Description

No. 649,059. Patented May 8, |9002- W. S. KERN.

ATTAcHMENT Eon Krruvns.

(Application Bled Feb. 8, 1900.)

(N0 Model.)

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NTTED STATES PATENT Prien.

WILLIAM S. KERN, OF lVlLKES-BARR, PENNSYLVANIA.

ATTACHMENT FOR KNIVES.

SPECIFICATION forming part 0f Letters Patent NO. 649,059, dated. May 8, 1900.

Application tiled February 3, 1900.Y Serial No. 3,865. (No model.)

To @ZZ whom, it may concern:

Be it known that I, WILLIAM S. KERN, a citizen of the United States, residing at l/Vilkes-Barr, in the county of Luzerne and State of Pennsylvania, have invented certain new and useful Improvements in Attachments for Knives, of which the following is a specification.

My invention relates to an attachment for knives by means of which the hand of the operator is protected from injury and the cutting operation is facilitated. It is particularly adapted for use in connection with thinbladed knives, such as are used in shops and factories for the purpose of cutting leather, cloth, the., and popularly known as cutters knives. I shall therefore describe and illustrate my invention in connection with a knife of this description.

In the 'accompanying drawings, Figure lis a perspective view of a knife with the fingerrest attached. Figs. 2 and 3 are upper and lower perspective views of the finger-rest. Fig. 4 is a similar view showing the manner of using the knife with the rest, and Fig. 5 is a similar View illustrating the manner in which the knife is ordinarily used.

Referring to Fig. l of the drawings, A indicates a knife of well-known form and very largely used for the purpose of cutting cloth, leather, dac. This knife consists of a handle l, clamps 2, and a blade 3. (Indicated in dotted lines in said figure and in full lines in Figs. 4 and 5.) The clamps are tightened upon the blade by means ofa screw 8 at the end of the handle. As theknife is well known and forms no part of my invention, further description of the knife itself is unnecessary. The blades used in knives of this kind have very thin edges, and it is customary in the use of the knife, particularly in cutting upon curves away from the operator, to place the foreinger upon the edge of the blade, as shown in Fig. 5, in order to secure the desired pressure and more perfect guidance of the blade. This results in continual cutting of the forenger of the operator, and as the pressure of said finger upon the blade cannot be very great it is necessary to grasp the handle more firmly than is desirable for the best results. For the purpose of cutting upon curves it is desirable to apply the pressure at the blade or at the forward end of the handle in order to permit the rear of the handle to swing around within the hand. If sufficient pressure cannot be applied at these points, then the handle must be grasped as before stated, and, as the knife and hand move t0- gether, the former can only be turned as far as the wrist-joint will permit. This is the situation as soon as the ringer of the operator becomes sore. In order to overcome this difficulty, I arrange upon the clamps 2.a removable finger-rest B, having a circular top 4, hollowed out or dished toward the center, as shown at 5, and having a longitudinally-slot- -ted shank G upon its under side. A set-screw 7 is arranged in one arm of the shank. The finger-rest is placed upon the clamp 2, as shown in Fig. 1, the clamp fitting within the slot and the head 4 resting upon the back of the clamp. The rest is secured in place by means of the set-screw 7. The set-screw pre-y vents the rest from sliding upon the clamp, and the hollow or dished upper surface of the rest prevents the forefinger, which bears upon it, from slipping olf. In practice the forenger is placed upon the rest, as shown in Fig. 4, and the handle is supported by the remaining fingers, which extend beneath it. The forefinger gives the required pressure -upon the knife-blade, and the handle need not, therefore, be grasped so tightly as where the finger-rest is not used. This permits the handle to be turned readily within the hand by the fingers which support it, and the cutting operation is thereby greatly facilitated, while at the same time the hand of the operator, is protected from injury.

The rest may be applied to other forms of knives; but it is peculiarly adapted to use Von knives of the kind described for the reasons mentioned.

Having described my invention, what I claim, and desire to secure by Letters Patent and means for seouringsad rest to the clamps,`

of the United States, issubstantially as described. 1o

The combination with a knife having In testimony whereof I affix my signature clamps for the blade extending forwardly of in presence of two witnesses.

5 the handle, of L finger-rest having a slotted l WILLIAM S. KERN.

shank fitting over said clamps, said rest hav- Vtnesses: ing :n head, hollowed ont or dished upon its JAMES COOL,

upper surface and resting upon said clamps, S. R. SMITH.

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