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Publication numberUS292917 A
Publication typeGrant
Publication dateFeb 5, 1884
Publication numberUS 292917 A, US 292917A, US-A-292917, US292917 A, US292917A
InventorsFeiedeich Wilhelm Kaldesbach
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Friedricii wiliielm kaldexbacu
US 292917 A
Abstract  available in
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Claims  available in
Description  (OCR text may contain errors)

(No Model.)



Ptentednb. 5. 1884.

1 l f f 1 f n f WIT/758858 Friedrich lflflhelmkzldenbach,


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SPECIFICATION forming part of Letters Patent No. 292,917, dated February 5, 1884.

Application filed August 6, 1883.

To all-whom, it may concern.- Be it known that I, FRIEDRICH WILHELM KALDENBACII, a subject of the King-of Prussia, Germany, residing at the city of Solingen, in the Kingdom of Prussia, Germany, have invented certain new and useful Improvements in Pocket-Knives, of which the following is a specification.

This invention relates to that class of pocket-knives which have sliding `-blades capable of being withdrawn into the handle and projected therefrom; and it consists in novel means for holding the knife-blade in either a projected or retracted position. Y

In the drawings, Figure l is a longitudinal sectional view of a knife, showing the blade in an open or projected position. Fig'. 2 is a back view of the same. Fig. 3 is a cross-section of the handle or sheath. Fig. 4t is a detail view of the locking-pin for the lblade. Figs. 5 and G are back views of modified forms of handles or sheaths. 'y

rlhe essential feature of the present construction is the push-pin a, which has the two Y offsets or projections c and the head d, this push-pin being so tted in a vertical cut or seat made in a rearwardly-extended knifeblade, B, that it can be moved up and down `in said seat.

This vertical cut intersects with or leads into a second horizontal cut,.in which is seated a spring, f, having one of its arms or members bearing -upon the lower side of the push-pin.

'The knife handle or sheath-A is provided with a space or recess, which extends throughout its entire length, so that the blade can be drawn into the same.

A'slot or elongated opening, 7L, made inthe back of the sheath, leads into the space or r'ecess thereof, and in this slit the neck portion b of the pin a is entered. i

The slot h can, for the purpose of more certainly insuring a locking of the blade, be provided with enlargements t', as is shown in Figs.

5 and 6.y

The opening and closing of a knife embodying my improvements is effected in the following vmanner: The head of the push-pin (No model.)

is grasped and slid to the front end of the sheath, thus carrying with it the knife-blade, and projecting it beyond the sheath; and as soon as the push-pin has reached the enlargement 'i of the guide-slot, the pressure of the spring f causes it to be pressed in an outward direction. This will cause the enlargement i to be occupied by the angular part of the pin, the neck portion b of the latter projecting beyond the sheath, and lthe oifsets c preventing the push-pin from being thrown out too far.` NVhen the blade is required to be pushed "back into the handle, the head d is depressed until the neck portion b is in line with, or on a level with, the guide-slot h, whereupon the blade can be pushed.v back again. lVhen the blade is in a closed or retracted position its casual displacement or movement is prevented by means of the spring f, which exerts a strong pressure upon wthe push-pin, and holds the neck portion of the latter in contact with the inner surfaces of the back of the sheath or handle.

If great safety or a very firm retention of the blade is desired, as in the construction l shown in Fig. 6, which represents la dirkknife, it is advisable to provide an enlargement of the guide-slot at its lower end. rIhis enlargement, however, can, in ordinary knives, be omitted altogether, as the friction of the pin c on the inner or under side of the surfaces of the back bordering the guideslot is great enough to prevent a slipping or displacement of the blade when the knife is in use. On the other hand, however, it may be found necessary to provide enlargements of the guide-slot at a point or points between` a, neck I), head d, and bottom projections7 c,

In testimony whereof Ihzwe signed n1 y naine ro to this speciiication in the presence of two subas and for the purpose set forth.

scribing witnesses.

2. The combination of the sheath. or handle A, having :L slot7 h, in its back, provided with one or more enlargements, @with the sliding knifeblade B, having a locking-pin consisting of the body a, neck b, head el, and I XVitiiesses: bottom lugs, o, and the spring f, bearing upon i LEOPOLD GEISENHEIMER, said pin7 is Aand for the purpose set forth. l GUs'rAv KREMER.


Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US2530917 *May 17, 1946Nov 21, 1950Don TaylorHair shaper
US2601402 *Dec 12, 1947Jun 24, 1952Autopoint CompanySliding blade knife
US5222951 *Apr 13, 1992Jun 29, 1993Leonard BloomGuarded skin hook for surgical use
US5511311 *Jan 12, 1994Apr 30, 1996Collins; Walter W.Knife with sliding base
US9676105May 15, 2012Jun 13, 2017Richard Wayne McChesneySystems, devices, and/or methods for managing an assisted opening retractable knife
WO1993020755A1 *Apr 7, 1993Oct 28, 1993Bloom, LeonardGuarded skin hook for surgical use
Cooperative ClassificationB26B5/001