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Publication numberUS1940855 A
Publication typeGrant
Publication dateDec 26, 1933
Filing dateJun 25, 1931
Priority dateJun 25, 1931
Publication numberUS 1940855 A, US 1940855A, US-A-1940855, US1940855 A, US1940855A
InventorsFriedman Hugo
Original AssigneeFriedman Hugo
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Knife
US 1940855 A
Images(1)
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Description  (OCR text may contain errors)

Dec. 26, 1933. FREEMAN} 1,940,855

KNIFE Original Filed June 25, 1951 132 2022 for Patented Dec. 26, 1933 UNITED STATES 1,940,855 KNIFE Hugo Friedman, Chicago, Ill.

Application June 25, 1931,-Serial No. 546,820

Renewed June 5," 1933 2 Claims.

ticularly to dental or surgical knives having detachable blades. Knives of this class thus far offered to the profession have presented numerous difiiculties in changing from one blade to another.

One of the objects of my invention is to provide a construction which will permit the several blades to be changed easily and quickly.

Another object is to provide a construction admitting of greater nicety of balance and design.

A further object is to provide a construction which will reduce the danger of personal injury to a minimum while changing blades.

Further objects will appear from the description and claims.

In the drawin trated,

Figure 1 is a side elevation of the knife;

Fig. 2 is a top view;

Fig. 3 is an enlargedview of, the knife with part of the handle broken away; a

Fig. 4 is a section on the line 44 of Fig. 2;

Fig. 5 is a fragmentary section showing the retaining spring in its raised position and a modified form of blade-positioning means, and

Fig. 6 is a section on the line 6-6 of Fig. 4.

Referring to the drawing in detail, the construction shown comprises a knife blade 1 removably retained in the slotted portion 2 of the ham dle 3 by means of the rivets 4 and the retaining spring5. The spring 5 has, at its forward end, an angular portion so formed as to be received in which my invention is illusin the slot 7 of the blade 1. The slottedportion of the handle 3 has a suitable hole 8 bored into it to receive and permit the necessary motion of the headed plunger or push button 9, said plunger having a head 10 to prevent its falling from the knife. As an alternative construction, the knife blade 1 may be positioned by means of the rib 4a, as shown in Fig. 5, and then retained in position by the retaining spring 5, as before.

In Fig. 4. the spring 5 and the plunger 9 are shown in the position they assume when the blade is locked in position. In Fig. 5 the spring 5 and plunger 9 are shown in the lifted position, as when a blade is to be inserted or withdrawn.

To detach a blade, the user simply grasps the handle in one hand and'presses on the push button 9 with the thumb to movethe latch portion 6 out of the notch '7 in the back of the blade, enabling the bladev to be readily withdrawn lengthwise from engagement with the handle.

It will be apparent that in the event the spring 5 breaks, it may be replaced without difficulty.

since it can be removed by simply withdrawing the shank portion 11 from the opening in the handle into which it fits snugly. V i I i In the embodiment shown I have provided a construction which will cause the blade to be posibutton having'a portion engageable for operation tively locked-in position and yet be readily removable. It will be seen that that the construction described enables the blades to be changed easily and quickly without danger of injury to the user. It is also apparent that while I have shown and described a surgical knife, this invention may be'used with any knife or device wherein it is necessary to use interchangeable blades.

It will be apparent to those skilled in the art that various modifications thereof may be appar- 7 ent to those skilled in the art without departing from the spirit and scope of this invention and, therefore, the same is to be limited only by the scope of the prior art andthe appended claims.

I claim:

1. A knife construction comprising a handle, a blade having a longitudinally extending openended slot in its securing portion, said handle having positioning means which enter the slot in assembly, and means for detachably securing said blade to said handle comprising a cantilever leaf spring member mounted on the handle and extending along the back thereof and having a latch portion adjacent its free end'for engaging an edge of the securing portion and a push button extending transversely through the handle and engaging a portion of the leaf spring intermediate its secured end and its free end, for moving the spring to releasing position, said push on the side of the handle opposite that along which the leaf spring extends.

2.. A knife construction comprising a handle, a blade having a longitudinally extending openendedslot in its securing portion, said handle having positioning means which enter the slot in assembly, and means for detachably securing said blade to said'handle comprising a cantilever leaf spring member mounted on the handle and ex tending along the back thereof and having a latch 10o portion adjacent its free end for engagingan edge of the securing portion and a push button extending transversely through the handle and engaging a portion of the leaf spring interme diateits secured end and its free end for mov- 05 ing the spring to releasing position, said push button having a portion engageable for operation on [the side of the handle opposite that along which the leaf spring extends, said leaf spring member having a shank portion extending into the handle and frictionally'held therein whereby the spring can be readily removed for repair and-replacement.

HU GO FRIEDMAN. V

Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US2507019 *Dec 6, 1946May 9, 1950Johnson Carl SKnife with reversible blade
US2530918 *Aug 3, 1946Nov 21, 1950Don TaylorHair shaper
US2630029 *Sep 9, 1949Mar 3, 1953Imp Brass Mfg CoCombination tube working tool and reamer
US2695450 *Mar 13, 1950Nov 30, 1954Western States Cutlery And MfgCombination cutlery tool
US2939213 *Oct 13, 1958Jun 7, 1960Daniel John MInsertible blade scissors
US2970569 *Mar 26, 1958Feb 7, 1961Erikan Elsa HeynauWriting implements
US3085332 *Apr 26, 1961Apr 16, 1963Philip Morris IncHandle for surgical blades, and the like
US3262205 *Jan 21, 1964Jul 26, 1966Ruth B ArdenScalpel
US3300858 *Mar 30, 1965Jan 31, 1967Dominion Electric CorpBlade-connecting means
US3307259 *Jun 22, 1964Mar 7, 1967Scovill Manufacturing CoPower operated knife
US3317998 *Sep 20, 1965May 9, 1967Matwijcow John JInterlocked blade and holder having resilient latching means
US3412467 *Nov 25, 1966Nov 26, 1968John J. MatwijcowSurgical scalpel
US3683498 *Nov 16, 1970Aug 15, 1972Stanley WorksCutting knife
US3877147 *Jun 25, 1973Apr 15, 1975Acme United CorpDisposable scalpel handle
US3900950 *Mar 18, 1974Aug 26, 1975Collins Walter WKnife with removable blade
US4534348 *Jan 10, 1983Aug 13, 1985Moskovsky Nauchno-Issledovatelsky Institut Mirrokhirurgii GlazaInstrument for making corneal incisions
US4608757 *Apr 11, 1985Sep 2, 1986Eckerle Douglas WDouble ended throwing knife
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US6105260 *Jan 23, 1998Aug 22, 2000Alterra Holdings CorporationUniversal saw adapter
US6113618 *Jan 13, 1999Sep 5, 2000Stryker CorporationSurgical saw with spring-loaded, low-noise cutting blade
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US7930829Apr 14, 2009Apr 26, 2011Stanley Black & Decker, Inc.Compact utility knife
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US8584367 *Jun 24, 2011Nov 19, 2013Hui-Tung ChuPocketknife with an assisted opening and closing mechanism
US8695221Aug 21, 2008Apr 15, 2014Wen HaoUtility knife with extended travel carriage
US20120324738 *Jun 24, 2011Dec 27, 2012Hui-Tung ChuPocketknife with an assisted opening and closing mechanism
EP0289957A1 *Apr 29, 1988Nov 9, 1988Kai Cutlery Center Co., Ltd.Cutter
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WO2000061014A1 *Apr 7, 2000Oct 19, 2000Michael S G BellScalpel assembly
Classifications
U.S. Classification279/24, 30/337, 30/339
International ClassificationA61B17/32
Cooperative ClassificationA61B17/3213
European ClassificationA61B17/3213