US1627197A - Scissors or shears with composite blade - Google Patents

Description

May 3, 1927.

'l. PATRICK SCISSORS on sums IIITHCQIIPOSITB BLADE Filed d t. m. 1924 Patented May 3, 1927.

ISAAC PATRICKLOF JAMAICA, NEW YORK.

OFFICE.

SCISSORS-OR SHEARS WITH COMPOSITE BLADE.

Application filed October 10, 1924. Serial No. 742,829.

This invention relates to scissors or shears of the type having composite blades, one.

part of whichhas the cutting edge thereon and is replaceable by another when the edge on the first blade or part becomes dull, and aims to provide improvements therein.

The invention provides scissors or shears of the type referred to, of an improved conj struction whereby a secure, and durable, connection-between the parts of the com posite blade is obtained. The improved construction is simple and well suited for large scale manufacture.

An ei'nbodiment of the invention is illustrated in the accompanying drawings, wherein Figure 1 is a side view of a scissors or shears; 1p 1 .Fig. 2 is an enlarged sectional view on the line 2.2, Fig. 1; and

. Fig. 3 is a sectional view on the line 3 -3, Fig. 1. v i iris Referring to said drawings, the shears comprise a pair of blades 10, 11, having handles 12, 18, the blades in the illustrated embodiment being pivoted as indicated at 15, the blades being opened and closed by the opening and closing of thehandles 12, 13 in a manner. wellunderstood.

One or both of the blades 10, 11 is a composite blade. The blade. 11 is here shown as a composite-blade. The composite blade comprises a cutting portion 17 and a sup-.

1 porting portion 18. i

The cutting portion 17 is preferably in the form of a thin fiat strip of-metal havingia sharpened edge 20 thereon, constituting the cutting edge.- has a shallow recess 22 on, the inner face 28 thereof, in which recessthe' cutting por= tion 17 is adapted to fit and be fastened,

said supporting portion 18 having ashoulder 25 at the lower part of the recess 22 opposite the cutting edge 20 when said out- 5 ting portion is in said recess, whichshoulder 25 is adapted to firmly support said cutting portion 17 under the pressure exerted on the cutting edge 20 in the act of'cutting.

Means are provided for fastening the cut Hting portion 17 and supportmg portion 18 together. These means conveniently comprise tongue andslot connections 30, 31, at V or near the two ends of the cutting part '17.

Theconnection 30 at the inner end of the cutting part is preferably located at a portion ofthe blades which is notuncovthe connection 30 between said sand its supporting part, in place in the portion of said supporting 111 position in the slot 39, so

The supporting portion 18 ered by the opening of inal use of the blades. another. blade (as, 10)

. ,'The blade opposite for example, the blade serves to hold the cutting part17, and cutting part recess 22.

The tongue andslot connection 30 conveniently comprises a tongue 37 on said cutting part 17 conveniently formed by strik-.

edge of the strip ing up or bending over .one of metal from which the said cutting part 17 is formed, and a corresponding groove 39 formed in said supporting portion 18. The tongue 37 may also be bent to more or less than a right angle, being shown asbent over more than a right angle, so as to lay over a part 18 when as to hold the cutting part 17 against displacement perpendicularly away from the broad face of the recess 22. The tongue. 37 and slot 39 are preferably at an incline to the longitudinal axis of the blade, so that the cutting part 17 has a combined longitudinal and lateral movement parallel to the broad ofthe tongue 37 in the slot 39,.and thus effec- -;tive1y holds the cuttingportion 17 and supporting portion 18 of-the jbla'de fixedto- The connecting means 31 also-holds the cutting part 17 on gether at themeans 30,

the shoulder-25. The connection 31is conveniently formed asan inturnedx'tongue 15,

projecting intoa slot d6, and hearing at its sides against the side portions of the said slot 46, and at its upper portion against the upper face 48 ofsaid slot 46, the said face 18 being inclined away from the broad face of the recess 22 in such manner that the tongue may bear over a portion 49 of said supporting part 18,. and thereby normally the blades in the nor- The oppositecon hold the blade against displacement from I the broad face of the said recess 22. Thetongue 45 may be bent-against said surface 18 after-the cutting part 17 has been placed in the'recess 22, but the tongue 45.n1aybe previously bent, and be slightly resilient, so

as to allow the saidtongue 45, to pass over the portion 49 in putting saidcutting por-r tionin plac e and the resiliency offsaid' tongue, after the said cutting portion is in place in the recess 22, will serve to press the lower edge of the said cutting portion 17 against theshoulder 25. V

I1; assembling the parts 17 and 18 ol' the composite blade, with the tongue and slot connection formed as described, the blade 10 is turned to the position shown in dotted lines, Fig. 1, exposing the slot 39, whereupon the cutting portion is'slid into place in the recess 22 with a combined inward movement parallel to the broad face of said recess 22 and a longitudinal movement. The tongue is thereupon bent over into the recess as, or, it the tongue is previously bent, is pressed into the recess in such manner that the tongue engages under the portionelt) of the supporting part 18, thereby holding the outer end of the blade against displacement from the broad face of the recess 22,.and also against longitudinal displacement, and holds the lower edge of the cutting part 17 against theshoulder 25.

The supporting portion or portions 18 of the blade or blades may be formed of an aluminum alloy possessing a hardness and strength similar to steel, by die shaping or casting. By this method, close uniformity in size and shape of the supporting portions '18 ot' the blades may be obtained, which would thus render the substitution or renewal of cutting parts 17 being made without difficulty. A uniform fit between the supporting part 18 and cutting parts 17 used to replace other cutting'parts, is thus obtained. I

The pivot 15 may comprise a pintle passing through the two blades, and havingshoulders 61, 62 at each end for holding the blades against separation. A. spring washer or washers may be interposed between theshoulder 61 or the shoulders and 62 and the corresponding shoulder or shoulders on the blade or blades. Thespring washers 65 bearing against the blades and against the shoulders (51, 62 on the pintle 60, press the two blades together, and consequently cause one blade to press the cutting part 17" of the opposite blade against the broad face of the recess 22 in which it is titted. The pintle 60 is conveniently formed as a short hollow tube or sleeve, the edges. of which are turned over to form theshoulders 61, 62.

The invention may receive other embodiments than that herein illustrated, and may be applied to other types of scissors or shears than that illustrated.

\Vhat I claim is:

1. Scissors or shears having a compositeblade comprising a cutting part and a supporting part, means for fastening said parts together, said supporting part having a longitudinal recess on its inner taco into which I said cutting part is adapted to fit, said recess having a shoulder at its lower side for support ng said cutting part opposite its cutting edge, said fastening means comprising a tongue and slot connection between blade comprising a cutting part and a supporting part, means for fastening said parts together, said supporting part having a longitudinal recess on its innertace into which said euttingpa-rt is adapted to lit, said re- .cess having a shoulder at its lower side for supporting-said cutting part opposite its cutting edge, said fastening means compris- .ing a. tongue and slot connection between said supporting part and said cutting part of the blade at a part not entirely uncover-ed by the blades when opened in the actot cutting, said tongue and slot being inclined with relation to the longitudinal axis of the blade. I

3. Scissors or shears having a composite "blade, comprising a cutting partand a supporting part, means for fastening said parts together, said supporting part having a longitudinal recess on its inner face into which said cutting part is adapted to fit, said recess having a shoulder at its lower side for supporting said cutting part opposite its cutting edge, said fastening means comprising a tongue and slot connection between said supporting part and said cutting part of the blade at a part not entirely uncovered by the blades when opened in the act or cutting, said tongue and slot being inclined with relation to the longitudinal axis of the I blade, said fastening means also comprising means preventing longitudinal movement of said blade, whereby the parts of the inclined tongueand slot connection are held against movement in a direction at right angles to the longitudinal axis of said blade.

4. Scissors-or shears having a composite blade comprising a cutting part and asup porting part, means for fastening said parts together, said supporting part having a 1011- gitudinal recess on its inner face into which said cutting part is adapted to fit, said recess-having a shoulder at its lower side for supporting said cutting part opposite its cutting edge, said fastening means comprising a tongue and slot connectionibetween said supporting part and said cutting part of the blade at a part not entirely uncovered by the blades when opened in the act of cutting, said tongue and slotbeing inclined with relation to the longitudinal axis of the o. Scissors or-shears having a composite blade comprising a cuttingpart and a supporting part, means for fastening said parts together, said supporting part having a 1011- gitudinal recess on its inner face into which said cutting part is adapted to fit, said recess having a shoulder at its lower side for supporting said cutting part opposite its cutting edge, said fastening means comprising a tongue and slot connection between said supporting part and said cutting part of the blade at a. part not entirely uncovered by the blades when opened in the act of cutting said tongue and slot being inclined with relation to the longitudinal axis of the blade, said fastening means also including a tongue and slot connection between said cutting part and supporting part at the outer end of said blade, said latter tongue and slot connection holding said cutting part against said shoulder on said support ing part.

6. Scissors or shears having a composite blade comprising a cutting part and a supporting part, means for fastening said parts together, said supporting part having a 1011- gitudinal recess on its inner face into which said cutting part is adapted to fit, said recess having a shoulder at its lower side for V silipporting supporting said cutting part opposite its struck up therefrom at each end adaptedto form part of the connection to said supporting part.

7. Scissors or shears having a composite blade comprising a cutting part and a sup porting part, means for fastening said parts together comprising tongue and slot connections, one of said connections being at a part of the cutting part not entirely uncovered by the blades when opened in the act of cutting, and another of said connections being provided by'a resilient tongue struckup from the cutting part and fitted in a slotin the supporting part, said slot having an undercut face inclined away from the broad or supporting face of the part, and the resilient tongue being adapted to engage behind said undercut face and thereby hold the cutting part in engagement with the supporting face of the supporting part.

In witness whereof, I have hereunto signed my narri'e,

ISAAC PATRICK.

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