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Publication numberUS2416277 A
Publication typeGrant
Publication dateFeb 18, 1947
Filing dateNov 2, 1945
Priority dateNov 2, 1945
Publication numberUS 2416277 A, US 2416277A, US-A-2416277, US2416277 A, US2416277A
InventorsSam Siegel
Original AssigneeJerome J Adams
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Pocket knife
US 2416277 A
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Description  (OCR text may contain errors)

' Feb. 18, 1947. I IE 2,416,277

POCKET KNIFE Filed Nov. 2, 1945 nmgzvrox;

I 311%? W I ATTORN EY Patented Feb. 18, 1947 POCKET KNIFE Sam Siege], Brighton, N. Y., assignor to Jerome J. Adams, New York, N. Y.

Application November 2, 1945, Serial No. 626,319

6 Claims.

This invention relates to pocket knives, more especially to a combination knife blade and holder therefor.

It is common practice in this art to provide a sheath for protection of the blade when not in use, in a form so that this same sheath will function alternately as a handle for the blade proper, thus facilitating the holding and the use of the blade, to a very great extent. In the usual form of pocket knife, it is customary for the blade to be pivoted near one extremity thereof, so that rotation of the blade will cause the sharp edge thereof to enter within the handle or sheath, while the unsharpened or thicker edge of the blade remains outside the sheath. Retraction of the blade from the sheath is then accomplished by grasping the exposed edge of the blade and rotating it about the pivoted point thereof. Since a spring device, or the equivalent thereof, is employed to maintain the blade securely in both its open and its sheathed position, and since only a very narrow portion of the blade is available for grasping by the fingers of the user, it is customary to provide a notch or indentation upon one side of the blade, parallel to the back edge and slightly removed therefrom. The finger nail of the user may then enter this notch and can then exert sufiicient forceto enable the'blade to be opened up into a position ready for use.

In a knife of the type just described, it is frequently necessary to exert considerable force, via the finger nail of the user, in order .to retract the blade. The finger nail of the user is frequently damaged, and accomplishing the opening of the knife, so as to put it in a condition for use, is a clifiicult and often annoying operation. If the retaining spring be made weaker, in order to facilitate the opening of the knife, this will lead to the danger that the blade may not remain in the fully opened position, when subjected during use to some relativel slight force which would tend to rotate it about the pivot thereof.

This invention comprises a pocket knife so constructed that it is not necessary to use the finger nail, in order to open the blade into position ready for use, thus avoiding the difficulties and disadvantages just described.

One object of this invention is to provide a pocket knife in which the blade is easily transferred from a protected position within the handle or sheath, to an exposed position, ready for use.

Another object of this invention is to provide a pocket knife in which traction upon an exposed control element will cause the blade to assume the openposition, ready for use.

Still another object of this invention is to provide a pocket knife in which use of the finger nails when moving the blade from closed to open position, or vice versa, is not necessary.

Yet another object of this invention is to pro vide a pocket knife in which the element upon which force is exerted in order to open or close the knife is in the form of a rigid finger-piece extending externally of the knife for a distance sufficiently great to permit an easy grasp thereof by the ends of the fingers of the user, whereby ease of operation is secured.

Another purpose of this invention i to provide a pocket knife in which the blade may be caused to assume a position ready for use, with a minimum of exertion upon the part of the user, while at the same time, the blade, when once in such position ready for use, will not readily be dislodged therefrom except when an intentional closure of the blade is desired.

Other purposes and advantages of the pocket knife of this invention will be apparent to those skilled in the artby a consideration of the hereunto annexed drawings and from the following detailed disclosure thereof.

Reference is now made to the hereunto attached drawings in which:

Fig. 1 is a plan View of the knife in closed position.

Fig. 2 is a view of the knife in closed position, broken away to show the internal members.

Fig. 3 is a view of the knife in open position, broken away to show the internal members.

Fig. 4 is a cross section on the lines 44 of Fig. 2.

Fig. 5 is a cross section on the lines 55 of Fig. 2.

Referring now especially to Figs. 1 and 2, the combination handle and sheath I9 is provided with aslot l l more clearly evident in Fig. 4. This slot extends for nearly the entire width of the handle, leaving only a bridging portion 12, uniting the opposite sides of the handle. Transversely of the handle there extend two rivet like members l3 and l 4, firmly ailixed to the handle proper by any suitable means such as riveting or welding.

Within the handle are located blade l5 and operating member l6, Blade I5 is rotatably mounted upon element I3, which thereby functions as a pivot for the blade. The pivoted end of the blade is provided with a pinion 26, Operating member [6 lies Within slot l l and slides longitudinally therein, the movement thereof to- 8 of a suitable shape, located so as to engage pinion 25 of the blade. The sliding of member I6 to the left or right will thus cause rotation of blade 15 about pivotll'i. As member 16 is pulled to the rightby engagement of thefinger tips of r the user with a suitable shaped aperture Hi, provided in an externally extending portion 28 of the operating member, the rack and pinion action of the arrangement just described, will cause blade I to rotate to the left, and assume the position shown in Fig. 3 to which reference additionally made.

Operating member is has a recessed portion 2| at the rack end thereof. In this ,recess .is arranged a spring 22, engaging the bridging portion ll of the handle, tending to force the rack and pinion into close frictionalengagement'with one another and additionally increasing the degree of force needed to operate the rack and pinion, thus reducing the possibility of accidental operation thereof, Operating member 18 is also provided with a slot 23. The portion 2a of this member, lying above slot 23, is in contact with the main body portion ofmember H5 at one end only, so that rivet l5 which-engages the upper surface of portion 24, will tend to force this resilient portion downwardly, thus increasing the friction between the lower edge of member iii and bridge portion 12 of the handle. Due to the controllable friction exercised both by spring 22 and by portion 2 3, the amount of force necessarily exerted upon the finger piece portion Ed, in order to cause extension or retraction of the blade l5, maybe set at a predetermined value.

It is to be noted that the provision of an ample finger-piece, having a large aperturetherein, not only permits a greater force to be exerted thereupon with ease, but the aperture also permits the knife to be suspended from a chain or the like, if so desired. 1

While there have been shown certain embodiments of this invention, other embodiments and modifications thereof will be apparent to those skilled in the art and the scope of this invention is limited only by the hereunto appended claims.

' What is claimed is:

1. A pocket knife including a handle provided with a "slot extending substantially the entire lengthof the handle and for the'major portion of the width thereof, a blade member pivoted in said's'lotnear one end of the handle and provided with a pinion at the pivoted end thereof, a substantially straight backed and non-resilient operating member slidably mounted in said slot, having a rack at one end, engaging said pinion of said blade member so as to rotate said blade member upon'sliding of'said operating member, andihavinga resilient portion near the other end thereof, .means for restraining said operating member within said slot, and means for limiting the slidingmovementof said operating member, said operating, member including afinger-piece portion extending externally of said handle, and

said means for restraining said operating element within said slot including a pin transversely afiixed to said handle and frictionally engaging said resilient portion of said operating member,

so as effectively to prevent longitudinal sliding motion thereof, until a predetermined degree of force is exerted upon said finger piece.

2. Apocket knife according to claim 1, in which the rack end of said operating member is slightly recessed at a point opposite the rack, and also including a spring member located in the recess and pressing against the bottom of said slot, so as to increase the amount of forceneeded to operate said rack and pinion.

3. Apocket knife according to claim 1, inwhich said operating element is pro-vided with a stop member, laterally projecting substantially at right angles to said operating element, whereby longitudinal sliding motion of said operating member is limited in extent in one direction by the engagement of said stop member and said pin affixed to said handle, motion in the other direction being limited by the action of said rack and pinion.

4. A pocket knife of the type wherein a rack sliding within the knife sheath rotates a pinion upon one end of a'blade and causes the blade to be alternatively extended or retracted, characterized in that the rack is substantially nonresilient as a whole but is formed with a longitudinal slot near one side thereof, thereby providing said rack with a portion of sufficiently small cross section to be effectively resilient, the resilient portion has a tooth-like member projecting substantially at right angles therefrom, and

the sheath has a transverse pin against which said tooth-like member engages laterallyysoas to limit the'inovement of the rack in one direction.

5. A pocket knife comprising a hollow sheath formed with two parallel fiat walls and a bridge portion along one edge of'each, acting to space apart said walls, a blade pivotally mounted between said walls, near one end of said sheath, a pinion surrounding the pivoted end of said blade, an operating element substantially non-resilient as a whole and slidably mounted between said walls, a rack at one end of said operating element, engaging said pinion, a resilient spring portion at the other end of said operating element, a rivet affixed to said sheath and engaging said spring portion so as to increase the sliding friction of said operating element, a stop member projecting substantially at right angles from said operating element, tangentially engaging with said rivet to limit the sliding of said operating element, and a spring recessed opposite said rack so as to increase the friction between said rack and said pinion.

6. A pocket knife according to claim 5, in which said rivet is of substantially circular cross section, and said stop member has the side thereof which engages said rivet lying in a substantially fiat plane, whereby said stop member presses against said rivet substantially wholly longitudinally and requires no lateral movement to be disengaged therefrom.


Non-Patent Citations
1 *None
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US4177560 *Aug 8, 1978Dec 11, 1979Hiroshi SakuraiSafety knife
US4347665 *May 11, 1981Sep 7, 1982Glesser Louis SPocket knife
US4525928 *Sep 8, 1983Jul 2, 1985Foster John EBlade opening scabbard for folding knife
US4719700 *Jun 26, 1986Jan 19, 1988Taylor Jr William JKnife opening mechanism
US5331741 *Aug 10, 1992Jul 26, 1994Taylor Jr William JLever-actuated folding knife
US5349753 *May 19, 1993Sep 27, 1994Patrick GaffneyOne-handed knife system
US6360443Sep 6, 2000Mar 26, 2002Cesar RemusFolding knife with blade actuating mechanism
US6460433Oct 16, 1998Oct 8, 2002C-Tech AgMultipurpose hand device
US6618947Aug 12, 2002Sep 16, 2003Imperial Schrade Corp.Spring for knife
US6779425Jul 16, 2002Aug 24, 2004Ctech AgMultipurpose handheld implement
US6941604Aug 28, 2003Sep 13, 2005Ctech AgMultipurpose hand-held implement of the pocket-knife type
US6948409Aug 23, 2004Sep 27, 2005Ctech AgMultipurpose handheld implement
US20120180319 *Jan 17, 2012Jul 19, 2012Isaac VellekampKicker Assist Mechanism
U.S. Classification30/158
International ClassificationB26B1/02, B26B1/00
Cooperative ClassificationB26B1/02
European ClassificationB26B1/02