Search Images Maps Play YouTube News Gmail Drive More »
Sign in
Screen reader users: click this link for accessible mode. Accessible mode has the same essential features but works better with your reader.


  1. Advanced Patent Search
Publication numberUS1319532 A
Publication typeGrant
Publication dateOct 21, 1919
Filing dateNov 25, 1914
Publication numberUS 1319532 A, US 1319532A, US-A-1319532, US1319532 A, US1319532A
InventorsGeorge V. Basm Ttssekt
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
George v
US 1319532 A
Abstract  available in
Previous page
Next page
Claims  available in
Description  (OCR text may contain errors)




1,3195%, Patented Oct. 21,1919.

.L I El. w/lim/eww 4a 3/ M j Swim mm GEURGE 1/ R/I8MUSSE/V 1-1": rmmmm mlmnulmvn' co, WASHINGTON ma.



Specification of Letters Patent.

Patented Oct. 731, 1219.

Application filed November 25, 1914. Serial N o. 873,853.

To all whom it may concern:

Be it known that I, GEORGE V. RASMUSSEN, a: citizen of the United States, and resident of the borough and county of Richmond, city and State of New York, have invented certain new and useful Improvements in Pocket-Knives, of which the following is a specification.

My invention relates to knives known as self opening wherein the blade is locked in the closed position and a spring is provided for throwing the blade toward the open position when the same is released or unlocked. The same locking means is generally also adapted to lock the blade in the open position.

Knives of this class as ordinarily made are provided with-a locking'device adapted to be operated by direct pressure normal to the side of the knife upon a locking member which device is apt to be accidentally released when the knife is in the pocket, in which case the one carrying the knife is liable to be cut or injured if the hand is placed in the pocket.

The object of my. invention is to overcome these objections by producing a knife ofsimple construction in which a movable cam is adapted to release the locking device of the blade. This arrangement not only requires a sliding action for operating" the locking device but avoids the possibility of the blade being released by direct pressure acting on the locking member normal to the side of the knife.

In the accompanying drawings I have illustrated severalforms of my invention.

Figure 1 is a side view of my pocket knife with handle shell removed and Fig. 2 a back view, with the shell partially broken away. Figs. 3 and 4 are corresponding views of another example of my knife. Fig. 5 is a view of the complete knife of the form shown in Figs. 3 and 4 and Fig. 6 is a view of the locking spring used in the forms shown in Figs. 3 and 4:.

Referring to the drawings, 1 is the knife blade provided with a shank 2 which is preferably circular in outline, the blade being pivoted at 3. The shank 2 is provided with two notches or depressions 4 located at diametrically opposite positions and adapted to receive a locking member when the blade is in either the open or closed position, the

open position of the knife being indicated in Figs. 1 and 2 and the closed position in Fig. 3. The blade is secured between the lining members 5 by means of a tubular rivet 6 which acts as the pivot for the blade, the back 7 being secured between the lining members by rivets 8 in the usual manner. l/Vitbin the knife and near the back thereof is located a leaf or flv spring 9 held in place by a rivet 10 substantially as illustrated in the drawings. The leaf spring is adapted to operate against the heel. of the blade when the same is closed for the pur pose of throwing the blade open or partially open when the locking member isreleased or withdrawn from the notch 4:- The locking member may be constructed in several. different ways as hereinafter pointed out.

In Figs. 1 and 2 a leaf spring 20 is employed and provided with the tongue piece 21 adapted to cooperate with notches 4: in the shank of the blade to lock the same in either its open or its closed position. In this construction the spring locking member is L-shaped and is provided at 22 with an upturned cam face adapted to cooperate with a cam face 23' formed on lever 24 pivoted at 25 to the lining 5 as indicated in Figs. 1 and 2 of the drawing. The oppo site end of the lever 2 lis provided at 26 witha finger piece adapted to project through an opening 27 in the shell 18 of the knife handle, as indicated in Fig. .2 of the drawing. A. spring is provided for restoring the lever to normal inactive position such a spring being indicated at 28 as a continuation or tail to the locking member 20 which is riveted at 29 to the lining 5. In operating this form of the device it will be seen that by a lateral pressure upon the finger piece 26 the cam 23 is forced under the cam face 22 to lift the tongue piece 21 out of the notches 4 of the blade and release the same so that it may be open or closed in the manner indicated. Obviously the form shown in Figs. 1 and 2 can be utilized for constructing a knife having two, three or four blades as desired; for a two bladed knife the opposite end of the knife can be provided with a blade and locking mechanism similar to that shown in the drawings and if it is desired to incorporate four blades in the knife the lining plates on each side can be provided with the locking and releasing mechanism at each end since all the operative mechanism is confined to one side and one end of the knife.

In Figs. 3, 4L and 5 a modified form of the cam member is shown in which a lever is pivoted at 51 to the lining of the knife and is provided at 52 with an upturned cam por tion adapted to cooperate with the beveled face 53 of the pin 5% slidable in the tubular rivet of the blade pivoted substantially as indicated in Figs. 3 and a of the drawing. The locking spring member of this form of the device is clearly illustrated in Fig. 6 wherein it is shown that the spring is riveted to one of the lining plates at 45 and is provided at 4l6 with an enlarged hole through which one of the rivets 43 is adapted to pass freely for the purpose of fastening the shell of the handle to the lining as indicated in Fig. elof the drawing. The lever 50 of the form shown in Figs. 3 and 4 is provided with a finger piece 55 on the end opposite to that carrying the beveled face 52 which finger piece projects through an opening 56 in the shell 18 substantially as shown in Figs. d and 5 of the drawing. The spring 57 is provided and adapted in any suitable manner to actuate the lever 50 to restore it to normal inoperative position after it has been displaced to move the cam face 52 across the beveled end of the pin 54 to release the locking member. This form of the device wherein parts of the operating mech anism are located on opposite sides of the blade obviously does not lend itself to a four blade construction, but it will be understood that two bladesone at each end of the handle can readily be constructed if so desired.

I have shown in the accompanying draw ing various modifications of my device but it will be understood that I do not wish to be limited to the forms shown or described for obviously those skilled in the art can vary the details of construction of the several forms of the device shown without decopiel of this patent may be obtained for five cent: each, by addressing the Commissioner of fatenta.

parting from the spirit and scope of my invention as defined in the accompanying claims.

I claim:

1. In a pocket knife the combination with a blade provided with looking notches in the shank thereof, of means cooperating with said notches for locking the blade opened or closed, a lining plate, a lever pivotally mounted thereon for movement in a plane parallel to said plate, one end of said lever being operatively connected with said locking means for unlocking said blade, a spring for normally holding said leverin position for the locking means to lock said blade, a scale provided with an elongated opening, and a finger piece secured to said lever and, extending through the opening in said scale, the opening being arranged to permit movement of the finger piece and lever for unlocking said blade.

2. In a pocket knife, the combination with a blade provided with locking notches in the shank thereof, of a lining plate, a lever pivotally mounted thereon for movement in a plane parallel to said plate, a member fastened to the lining plate and having a movable end arranged to engage the locking notches and operatively connected with the aforesaid lever, the other end of said menr ber constituting a spring for normally holding the lever in position for the movable end to lock the blade, a scale provided with an elongated opening, and a finger-piece secured to said lever and extending through the opening in said scale, the opening being arranged to permit movement of the finger-piece and lever for unlocking said blade. Q

In testimony whereof I have hereunto set my hand in the presence of two subscribing witnesses. V e GEORGE V. RASMUSSEN. WVitnesses: r


Washington, D. G. 7

Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US4974323 *Jul 11, 1988Dec 4, 1990Cassady William ECoherent control device for folding knife, tool, etc.
US7107686Feb 6, 2004Sep 19, 2006Buck Knives, Inc.Spring assist knife
US7124509 *Sep 17, 2004Oct 24, 2006Grant Woodrow HawkSpring powered toggle joint lock for a folding knife
US7140110Jun 4, 2004Nov 28, 2006Lake Ronald WFolding knife having a locking mechanism
US7146736 *Aug 30, 2004Dec 12, 2006Collins Walter WFolding knife with cantilevered spring
US7296355Oct 12, 2004Nov 20, 2007Kai U.S.A., Ltd.Adjustable blade-assisting mechanism for a folding knife
US7313866Jan 31, 2006Jan 1, 2008Buck Knives, Inc.Spring assist knife
US7340838Jun 16, 2003Mar 11, 2008Kai U.S.A., Ltd.Folding knife with safety lock
US7395599Nov 18, 2004Jul 8, 2008Kai U.S.A., Ltd.Blade-assisting mechanism for a folding knife
US7458159Nov 14, 2005Dec 2, 2008Kai U.S.A., Ltd.Folding knife having a locking mechanism
US7506446Apr 16, 2004Mar 24, 2009Kai U.S.A., Ltd.Locking mechanism for a folding knife
US7774939Aug 17, 2010Kai U.S.A., Ltd.Stud-lock knife
US8001693Aug 23, 2011Onion Kenneth JClosable knife with opening mechanism
US8020302 *Sep 20, 2011Chih-Chen KaoFolding knife having a poking element
US8161653Nov 12, 2007Apr 24, 2012Leatherman Tool Group, Inc.Folding tool having a rotatable locking mechanism
US8307555May 3, 2011Nov 13, 2012Onion Kenneth JClosable knife with opening mechanism
US20040088865 *Jun 16, 2003May 13, 2004Onion Kenneth J.Folding knife with safety lock
US20060174490 *Nov 14, 2005Aug 10, 2006Kai U.S.A., Ltd., Dba Kershaw KnivesFolding knife having a locking mechanism
US20090126200 *Dec 21, 2007May 21, 2009Chih-Chen KaoFolding knife having a poking element
US20110203115 *Aug 25, 2011Onion Kenneth JClosable knife with opening mechanism
U.S. Classification30/159
Cooperative ClassificationB26B1/046