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Publication numberUS57902 A
Publication typeGrant
Publication dateSep 11, 1866
Publication numberUS 57902 A, US 57902A, US-A-57902, US57902 A, US57902A
InventorsCharles Hibbaed
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Improved spring dirk-knife
US 57902 A
Abstract  available in
Previous page
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Claims  available in
Description  (OCR text may contain errors)



Specification forming part of Letters Patent No. 57,902, dated September 1l, 1866.

To all whom it may concern: its center, upon which the arms respectively Be it'known that I, CHARLES HIBBARD, of work as a fulcrum. On the under side, near Chicago, in the county of Cook and State of the end of each arm, a nose or catch, c c', is Illinois, have invented a new and Improved formed, the nose c catching into a recess in Spring Dirk-Knife, and I do hereby declare the bolster of the blade when the blade has that the following is a full, clear,r and exact been thrust in for the purpose of keeping it "enable others incased, and the nose c resting against a shoulskilled in the art to make and use the same, der on the bolster of the blade for keepingthe reference being had to the accompanying blade thrust out.l A drawings, forming part or" this specification, The arms ot the catch-bar are operated by a in which" thumb-piece, f, on the back of the knife. B

Figure l is a side view of the knife with the pressing down upon this thumb-piece it throws blade extended. Fig. 2 is a longitudinal verboth catches c c into position to catch the tical section taken in the plane of the line :n x, blade in either a closed or open position, and Fig. l. Fig. 3 is a section taken in the plane byl raising it up with the thumb it releases of the line y y, Fig. l. both the catches c c.

Similar letters ot reference indicate like A pin, g, is provided for drawing back the parts. blade. is pin is run through a hole in the To enable others to understand my invenbolster oi the blade, so that it will, on turning tion, I will proceed to describe it. the handle sidewise, fall out for a short dis- A designates the handle of the knife. he tance, so that it can be taken hold of; and it said handle is hollow, being made of two parts runs along a slot, 7L, Fig. 1, when drawing in and united together by rivets in the usual way. the blade.

Bis the blade, which is fitted to slide in. This knife4 can be easily operated with one and out of the handle in any proper way, and hand, and by reason. of the spring it can be its length is suchv that 1t can be pushed fully allnost instantly adjusted for use. into the handle, so that its pointwill be covl What I claim as new, and desire to secure ered. by Letters Patent, is-

C is a spiral spring located in the handle, 1. The catch-bar D D, having catches c c one end resting against the end wall of the on its ends, in combination with the blade B handle and the other against the blade B. and spiral spring C, substantially as described.

his spring is of a sufficient capacity to vthrow 2. rIhe pin g, in combination with the blade the blade out instantly when the latter has B and spring C, substantially as and for the been released. purpose specified.

D represent the two arms of the catch- CHARLES HIBBARD. bar. These arms are jointed together, as shown Witnesses: at b, and a rivet, c, connecting the two parts MOWRY FANUM,

of the handle, passes through each arm near J. K. BOYD.

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US2447381 *Feb 13, 1946Aug 17, 1948Albert White HaroldBottle opener
US7086158Apr 22, 2002Aug 8, 2006Les HalpernSliding knife with disengaging blade actuation mechanism
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
US7574804Feb 14, 2006Aug 18, 2009Kai U.S.A., Ltd.Knife with sliding blade and disengageable deployment mechanism
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
Cooperative ClassificationB26B5/001