US1458104A - Detachable-blade knife - Google Patents

Description

june 5, i923. )1,458M- H. Bmx

DETACHABLE BLADE KNIFE Filed Jan. 20. 1922 Patented ,lune 5, 1323.

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tattica carica.

HAROLD BRIX, OF CHICAGO, IL XLLINOIS,

DETACHABLE-BLADE KFIFE.

Application tiled January 20, 1922. Serial No. 530,598.

7'0 all whom t may concern:

Be it known that l, HAROLD Bmx, a citizen of the United States, residing at 65 East Lake Street, Chicago, in the county ot' Cook and State of illinois, have invented a new and useful improvement in Detachable-Blade Knives, of which the following is a specification.

This invention relates to improvements in detachable blade knives, and more particularly to a device of that character in which the blade is made of thin sheet-metal, which is more or less flexible; so that the handle, in which the blade is mounted for use, not only holds the blade, but also reinforces and stifl'ens it to a certain extent.

The invention will be fully understood by reference to the followingr specitieation and vaccompanying drawing, in which Figure 1 is a view in side elevation of a device embodying the features of my invention, Figure 2 is a top plan view, Figure 3 is a view on an enlarged scale with one of the blades removed from the handle, Figure l is a Avertical sectional view of the handle, Figure .3 is a view similar to Fig. 1 showing the blade in place, and Figure 6 is a view taken as indicated by the line 6 of Fig. Ll.

As shown in the drawings, the handle of the knife comprises a hand-grip portion l10 having at one end a blade-supporting portion comprising two parallel prongs 11, separated by a slot 12. The two prongs 11 are joined near which extends across the slot 12.

Mounted in the part 10 of the handle at the end where the prongs 11 join, is a circular spring 1T as shown. This spring 17v is put in place in a hole provided, and a plug 18 is then inserted to hold the spring in place,

In Fig. 3 is shown one of the blades 50. This blade is made preferably of thin sheet-metal. Blades from such metal can be easily and cheaply made; and can ordinarily be stamped out in the shape shown. Such metal is usually more or less flexible. 2t) indicates the cutting edge of the blade. 'lhe upper edge 21 of the blade is provided with a downwardlyy and rearwardly extending notch or eut 22, adapted to accommodate the pin 13, when the blade is in place. 'llhe back end of the blade is eonvexly their ends by a pin 13,v

curved, as indicated by 23. 1n this curve and at about the center, is provided a recess or notch 24. The bottom of the rear edge of the blade is also provided with a depending tongue 26. The forward end of the part 10 of the handle, where it meets the rear end of the slot 12, is concavely curved, as indicated by 30, to correspond with the convex curve 23 on the rear end of the blade. The spring 17 is so located that it projects .slightly into the slot 12, as shown.

in operation, the blade is placed in the slot 12 behind the pin 13, and moved so that the cut or slot 22 embraces the pin 13; so that it will be in position, as indicated by the broken lines in Fig. 5. 'llhe back end of the blade is then pressed downwardly, causing the blade to rotate on the pin .13, until the notch 24 at the rear of the blade 'snaps over the spring 17. lVhen in this position the convexly curved rear end 23 of the blade will be in contact with the concavely curved part 30 of the handle, thus preventing further downward movement of the back end` of the blade; and the pin 13 will be at the inner end of the cut or notch 22. The blade will thus be firmly held in position for use. In removing the blade, upward pressure on the tongue 26 will release the notch 21 from the spring 17, permitting the back end of the blade to be swung upwardly, so that the notch or cut can be removed from the pin 13 and the blade lifted out.

lt will be noted that the prongs 11 of the handle are considerably thicker than the blade and extend forwardly more than half Iof the length of the blade. These prongs not only assist in supporting the blade in the handle, but also strengthen and stiti'en it and prevent bending of the blade in use. v li'hile I have shown and described eertain embodiments of my invention, it is to be understood that it is capable of many modifications. Changes therefore in the construction and arrangement may be made without departing from the spirit and scope of the invention as disclosed in the appendedrclaims, in which it is my intention *to claim all novelty inherent in my invention as broadly as possible in View of the prior art.

' edge of the blade adapted' to embrace the pin joining the ends of the prongs, and a notch at the back end of the blade adapted to engage with spring means in the handle.

2. A thin flexible blade provided with a downwardly and rearwardly extending slot with parallel sides at its upper edge and having its back end convexly curved and provided with a notch. l

3. ln a device of the character described,

a handle comprising a hand-grip portion and a blade-supporting portion, the blade-supporting portion comprising two parallelly arranged stiff prongs with a slot between adapted to accommodate a thin flexible blade, a in ,joining the prongs near their ends, a thln flexible blade adapted to fit in the slot between the prongs and provided at its upper edgewith a downwardly and rearwardly extending notch adapted to embrace said pin, and means for yieldingly-pressing the blade forward to retain the pin in the notch.

4. ln a device of the character described, a handle comprising a hand-grip portion and a blade-supporting portion, the bladesupporting portion comprising two parallelly arranged stii prongs with a slot between adapted to accommodate a thin flexible blade. a pin joining the prongs near their ends, a thin flexible blade adapted to it in the slot between the prongs and provided at.

its upper edge with a downwardly and rearwardly extending notch adapted-fte embrace said pin, and a notch at the back end of the blade adapted to engage with spring means in the handle. c

5. lna device of the character described; a handle comprising a hand-'grip portion and a blade-supportlng portion; the bladesupporting portion comprising two parallelly arranged stili' prongs with a slot between adapted to accommodate a thin flexible bla-de; a pin joining the prongs near their ends; a thin flexible blade adapted to fit in the slot between the prongs and provided at its upper edge with a notch adapted to embrace said pin; said blade adapted to be placed in position by placing said notch in engagement with said pin with the back end of said blade projecting above said prongs, and pivoting the same about said pin as an axis by lowering the back end; and

means for yieldingly retaining said blade in position.

6. In a device of the character described, a handle comprising a handgrip portion and a blade-supporting portion, the bladesupporting portion comprising two parallelly arranged stiff prongs with aslot between adapted to accommodate a thin flexible blade, a thin flexible blade adapted to be swung into position into saidl slot from the top and be embraced by said prongs and means for detachably retaining the blade in the slot.

7. In a device of the character described, a handle comprising a4 hand-grip portion and a blade-supporting portion, the bladesupporting portion comprising two parallelly arranged stiff prongs with a slot be- 4 tween adapted to accommodate a thin flexible blade, and a thin flexible blade adapted to be swung into position into said slot from the top and `be embraced by said prongs at its upperedge.

8. In a device of the character described, a handle comprising a hand-grip portion and a blade-supporting portion, the blade-supporting portion comprising two parallelly arranged stili' prongs with a slot between adapted to accommodate a thin flexible blade, and a thin flexible blade adapted to be swung into position into said slot fromI the top andbe embraced by said prongs along the major part of its upper edge.

9. In a device of the character described, a handle comprising a hand-grip portion and a blade-supporting portion, the blade supporting portion comprising two parallelly arranged stiff prongs with a slot between adapted to accommodate a thin flexible blade, a pin joining the prongs near their ends, a thin flexible blade adapted to be swung into position from the top into the slot between the prongs andprovided at its upper edge with a notch adapted to embrace said pin and means for detachably retaining the blade in the slot between the prongs.

10. In a device of the character described, a handle lcomprising a hand-grip portion and a blade-supporting portion, the blade supporting-portion comprisingj two parallelly arranged stili prongs witi a slot between adapted to accommodat a thin ilexible blade, a pin joining the prongs near their ends. a thin flexible blade adapted to be swung into position from the top into the slot between the prongs, a notch in the upper edge of the blade adapted to embrace the pin joining the ends ot' the prongs, and means at the back end of the blade adapted to engage with co-acting means in the handle for yieldingly retaining the blade in position in the slot between the prongs.

HAROLD BRIX.

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