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Publication numberUS1412373 A
Publication typeGrant
Publication dateApr 11, 1922
Filing dateJul 20, 1921
Priority dateJul 20, 1921
Publication numberUS 1412373 A, US 1412373A, US-A-1412373, US1412373 A, US1412373A
InventorsShields Howard F
Original AssigneeShields Howard F
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Self-opening pocketknife
US 1412373 A
Abstract  available in
Previous page
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Claims  available in
Description  (OCR text may contain errors)




Patented Apr. 11,



Application filed July 20, 1921.

T 0 all whom it may concern:

Be it known that I, HowARD F. SHIELDS, a citizen of the United States, residing at Eureka, in the county of Humboldt and State of California, have invented certain new and useful Improvements in Self-Opening Pocket-knives, of which the following is a specification.

This invention relates to self opening pocket knives and more particularly to an improvement in the structure for the pocket knife whereby it will not be necessary to have the blade extending a slight distance from the blade holder in order to obtain a grip on the blade for opening it.

The primary object of the invention is to provide a pocket knife having a spring arrangement engageable with the blade wnereby the spring may be manually released for permitting the blade to be thrownpartially open whereby it may be conveniently gripped'to be pulled fully open.

Other objects of the invention will appear upon consideration of the following detail description and accompanying drawings, wherein 1 Figure 1 is a side elevation of the device constructed in'accordance with my invention showing the blade in open position.

Figure 2 is a longitudinal section showing the blade closed.

Figure 3 is a longitudinal transverse section showing the blade closed with the mechanism in position for being released to release the blade.

Referring to the drawing by numerals, the pocket knife casing 1 consists f the longitudinal strips 2 and 3 between which a space 4 is provided to receive the blade 5, the latter being pivotally mounted upon the pivot member (3 in the usual manner.

Laterally spaced from the side member 3 is an outer panel 7 through which the pivot member 6 extends. Between the outer panel 7 and the space 4 which contains the knife blade, a housing 8 is formed to receive a coil spring which is disposed in the position shown in Fig. 2, one end of the spring 9 being provided with a cap 10 whereby the cap may be depressed to contact the spring.

By referring to Fig, 2 it will be noted that the wall 3 is cut at an angle or in a manner as indicated at 11 and this is to permit the arcuate swinging movement of the pressure pin 12 carried by the knife blade when it is swung on its pivot 6. lVhen the blade is closed the pin 12 will engage the spring cap Specification of Letters Patent.

Patented Apr. 11, 1922.

Serial No. 486,051.

l0 and force the spring downwardly whereupon a latch pin 13 is inserted through a side opening in the outer wall 7 and permit it to engage a groove in the top of the cap 10 as shown in Fig. 2 so that the cap will be held in locked position. The releasing pin 13 is provided with a knob 14 whereby it may be conveniently gripped, and it will be obvious from the construction described and illustrated that when the knob is pulled out- 'ardly to release the pin 13 from the groove in the spring cap, the spring will act to force the spring cap upwardly and throw the knife blade upwardly by virtue of the contact with the pin 12 carried by the knife blade. Of course, when the blade is thrown partially open it may be conveniently grasped by the fingers of the user in order that it may be swung fully open to be used.

lVliat is claimed is:-

1. ll. knife of the character described comprising a knife casing having a knife blade adapted to fold into the casing one side of the casing provided with a compartment, a coil spring mounted in the compartment and equipped with a spring cap, the said knife blade having a projecting pin adapted to engage the spring cap when the knife blade is closed, and means to releasably hold the spring cap in position against the pressure of the spring when the knife blade is held within the casing.

52. A self opening pocket knife comprising a knife casing. a blade adapted to fold into the casing and equipped with a laterally projecting pin, a compartment formed in the casing in the path of movement of the said pin when the knife blade is swung to closed position, a spring arranged within the compartment, a spring cap mounted on the upper end of the spring, the said cap being provided with a transverse groove in its upper surface, and a releasing pin extending laterally through the side of the casing and adapted to engage the said groove in the spring cap when the blade is swung to closed position whereby the blade may be held within the casing and forcibly ejected therefrom when the said releasing pin is disengaged from the spring cap.

In testimony whereof, I have aiiixed my signature in the presence of two witnesses.




Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US2491629 *Nov 13, 1945Dec 20, 1949Zenith Radio CorpAntenna
US2808646 *Jun 8, 1954Oct 8, 1957Karl LohrPocket knife
US6460433Oct 16, 1998Oct 8, 2002C-Tech AgMultipurpose hand device
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
US7107686Feb 6, 2004Sep 19, 2006Buck Knives, Inc.Spring assist knife
US7140110Jun 4, 2004Nov 28, 2006Lake Ronald WFolding knife having a locking mechanism
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
US7774939Jan 28, 2005Aug 17, 2010Kai U.S.A., Ltd.Stud-lock knife
US8001693Jun 5, 2006Aug 23, 2011Onion Kenneth JClosable knife with opening mechanism
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
U.S. Classification30/159
International ClassificationB26B1/00, B26B1/06
Cooperative ClassificationB26B1/06
European ClassificationB26B1/06