US1465751A - Knife - Google Patents

Description

Aug. 21, 1923.

R. L. WRlGHT KNIFE Fiied May 9, 1922 /M l .w m

Patented Aug. 21, 1923.

ROBERT LLOYD WRIGHT, OF SALEM, OHIO.

KNIFE.

Application filed May 9,

To all whom z'tmay concern:

Be it known that I, ROBERT L. WRIGHT, a citizen of the United States, and resident of Salem, county of Columbiana, and State of Ohio, have invented a new and useful -Improvement in Knives, of which the following is a specification.

My invention relates to knives having disappearing and renewable knife blades.

One of the objects of my invention is a knife having a renewable blade which can easily be inserted into or removed from the handle; another object is a means, directly on the knife, for sharpening the blade without grinding; another object is a knife in which used razor blades can be utilized for knife purposes; another object is a knlfe in which the blade can easily be brought into or outv of operative position: another object is a knife in which the blade is protected to prevent injury to its cutting edge as well as to the operator: another objectis a knife into which a blade can be clamped without tools; other objects will appear or become apparent in the description of this invention.

I attain these objects by the mechanism shown, in one exemplification, in the accompanying drawing in which Fig. 1 is a general side view of a complete knife made according to the present invention, partly broken away to show location and arrangementof elements thereof; Fig. 2 is an end view of Fig. 1 at 2, on a larger scale; Fig. 3 is a section on line 3-3 of Fig. 1,- also on a larger scale; Fig. at is a section on line 4-4 of Fig. 1, also on a larger scale; Fig. 5 is a section on line 5-5 of Fig. 1. also on a larger scale; Fig. 6 is an end view of Fig. 1 at 6, also on a larger scale: Fig. 7 is a perspective view of the sheath; Fig. 8 is a perspective view of the blade holder shell: Fig. 9 is a perspective view of the blade holder spacer; Fig. 10 is a perspective view of the blade clamp, and Fig. 11 is a general perspective view showing method of breaking of? the ends of the blades.

Similar reference characters refer to similar parts throughout the views.

In many instances it is necessary that a very sharp and pointed knife blade be available. For instance. for ripping seams in households. or in tailor shops. for cutting cloth intailor shops or elsewhere, for cutting paper in various industries as in pack- 1922. Serial NO. 559,504.

which can readily be sharpened by anopera'.

tor not skilled in sharpening knives.

Referring now particularly to the draw- I 1 ing.

drawn brass although other material may be used, is formed as shown perspectively in Fig. 7 and sectionally in Figs. 3, 4, and 5, and further in Figs. 2 and 6.

The blade holder B is, preferably, made of hard drawn brass although other material may be used, and is formed as shown perspectively in Fig. 8 and seotionally in Figs. 3, 4, and 5.

The outside of this blade holder B fits stiflly into the inside of the hollow 10 of the sheath A and is formed with the slot 11 extending all the way through both the wider portion 12 and the narrower portion 13. Both walls of the portion 13 are reduced in thickness at 14 and these portions 14 are provided with the hinge pin hole 15. Thel: purpose for the above will appear present v.

The spacer C, preferably made of brass, is formed as shown perspectively in Fig. 9 and sectionally in Figs. 3, 4;, and 5, and has the wider portion 16, the handle portion 17, the narrow portion 18, and the projecting portion 19. This spacer fits into the slot 11 of the holder B and is secured therein by spot welding or other means.

The clamp D is formed as shown in Fig. 10. of somewhat springy or tenacious material, preferably brass. and has the hinge pin hole 20 and the slot 21 which fits over the reduced ends 14: and is hinged thereto by the hinge pin 22.

The thickness and width of the ends 14 should be reduced sufliciently so that the outside of the clamp D is flush with the outside of the portion 13 for the purpose of permitting the holder B to slide endwise freely inside of the sheath A when the holder is assembled with the spacer C and the clamp D in position.

The clamp D is first formed with the slot 21 somewhat narrower than the width The sheath A, preferably made of hard I over both of the ends 14 so that the clamp forces these ends 14 inward or together and thereby clamp them upon the blade E when the clamp is in normal position as seen n Fig. 1 and thereby holds the blade E 1n position in the holder.

The blade E, either a used razor blade or one made for the purposes of the present knife, fits into the slot 11 and over the projection 19 and extends outwardly therefrom.

The spacer C does not extend to the full rear end of the holder B, thus leaving the end portion of the slot 11 open a short distance inward at this rear end.

This open slot provides a means for resharpening the blades which; sharpening is accomplished by inserting the dull end of the blade E into this slot and breaking off the dull portion which action presents a new cutting edge at the front end or point where the resent knife is mostly used.

T e spacer C does not extend to the full front end of of the holder B, thus leaving the slot 11 open at the ends 14 for the purpose of inserting the blade E.

The ends 14 on the holder B are also cut away on the top at 23 of a depth equal to the thickness of the metal of the clamp D so that the top thereof is flush with the top of the holder B to permit the holder to slide freely inside of the sheath A.

The sheath A is first formed with the lower edges 24 and 25 touching each other. The portions 26 and 27 are then cut away, thus forming the slot 28 wherein the portion 16 of the spacer C can slide freely.

At each end of the slot 28, the portions 24 and 25 act as stops to arrest the forward and the backward movement of the holder B durin the normal manipulations thereof.

After the parts are made up as set forth, the knife as a whole is assembled as follows:

Place the spacer G into the holder B in proper position and secure it there. Then place the clamp D in position and insert and secure the hinge pin 22. Then swing the clamp to out of the way position or releasing position on the pin 22 as indicated by dotted lines in Fig. 1 whereupon the ends 14 spring outward slightly, thus releasing the ends 14 and increasing the width of the slot 11. It is noted that the clamp D is not quite as wide as the portion 13, thus providing the shoulder 29 against which pressure may be exerted, by finger nail or I otherwise, to push the clamp, which fits tightly over the ends 14 when in normal position, out of the way. Then insert the lads E into the slot 11 and over the projection 19 and then push the clamp D down and over the ends 14 which operation clamps the blade into position.

Then insert and push the now assembled holder and blade longitudinally into the slot 10 at the rear end of the sheath A until the shoulder 30 strikes the lower and rear ends 24 and 25. Then exert sufficient pressure, also longitudinally, to force these ends 24 and 25 apart sufficiently to permit the holder to enter. Then push the holder further, in the same direction, until the neck of the handle 17 resides in the slot 28 where it can move back and forth freely. l

The operation of the appearing and disappearing feature of this knife is as follows:

After the holder with the blade is inserted and the knife is completely assembled, the holder is pushed backwards by means of the handle 17 until the rear end thereof strikes the normally touching ends 24 and 25 which acts as a stop and indicates that the blade is in receded position within the sheath A Where the cutting edge of the knife as well as the user thereof is protected from injury.

When it is desired to use the knife, push the holder forward by means of the handle 17 until the front end thereof strikes the normally touching ends 24 and 25 which acts as a stop forwardly and indicates that the blade is fully extended outside of the sheath A where it is available for cutting purposes.

When it is desired to insert a new blade, the holder is pushed backwards, by means of the handle 17, until it strikes the rear ends 24 and 25; a further and more forceful push backwards opens these ends and permits the holder to be removed from the sheath. A new blade is then inserted into the holder by means of the clamp D as previously set forth.

To prevent rusting of the knife, it is preferred that all parts except the blade be made of nonferrous metal, brass for instance, and may be nickeled or otherwise plated.

Modifications of the knife shown and described may be made within the scope of the appended claims.

Therefore, without limiting myself to the precise construction shown and described,

I claim:

1. A knife comprising a hollow sheath, a blade holder slidably mounted in said sheath and provided with a slot at the front end, a blade having one end thereof mounted in said slot, and a clamp over said front end and adapted to clamp said blade into operative position and to release the same for removal thereof.

2. A knife comprising a hollow sheath provided with a slot on one elge intermeiate its ends a blade holder slidably mounted in said sheath and provided with a slot at the front end and with a neck projecting through said slot in said sheath and with a handle projectindg outside of said slot in said sheath, stop e gas on each end of said slot in said sheath to prevent excessive backward and forward movement of said holder, a blade having one end thereof mounted in said slot, and a clamp over said front end and adapted to clamp said blade into operative position and to release the same for removal thereof.

3. A knife blade holder having a slotted portion adapted to receive a knife blade and a second slotted portion adapted to engage a knife blade for the purpose of breaking off the end thereof, a U shaped clamp over the first said slotted portion and hinged thereto and adapted to close in or release the first said slotted ortion.

4. A kni e comprising a hollow sheath having a slot on one edge intermediate its ends, a blade holder slidably mounted in said hollow sheath and provided with a blade holding means on its front end and with a neck extending through said slot and with a handle on said neck and projecting outside of said sheath, a blade having the near end thereof mounted in said holding means, and a stop means to prevent excessive backward and forward movement of said holder.

5. A knife comprising a hollow sheath having a slot on one ed and a stop at each end of this slot, a b ade holder slidably mounted in said sheath and provided with a blade holding means on its front end and withv a neck on its rear end projecting through said slot intermediate said stops and with a handle on said neck and projecting outside of said sheath, and a blade in sald blade holding means.

6. A knife comprising a hollow sheath having a slot on one edge and a stop at each end of this slot, a blade holder slidably mounted in said sheath andprovided with a sharpening slot at one end and with a second slot on the other end, a blade in said second slot, and a U shaped clamp over and hinged to the said other end of said holder.

7. A knife comprising a hollow sheath 0 en at each end and having a slot on one e ge and a sto at each end of this slot, a blade holder sli ably mounted in said sheath and adapted to be inserted into and removed from said sheath through the rear one of said open ends and.provided with a sharpening slot at one end and with a second slot on the other end, a blade in said second slot and adapted to slide in and out through the front one of said open ends in the sheath, and a clamp over and hinged to the said other end of the holder.

In testimony whereof I have hereunto aflixed my si ature.

R0 ERT LLOYD WRIGHT.

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