US1628856A - Composite blade for scissors, shears, etc., and cutters therefor - Google Patents

Description

l. PATRICK COMPOSITE BLADE FOR SCISSORS, SHEARS, ETC., AND CUTTERS THEREFOR K May 11, 1927. 1,628,856

Filed May 23. 1925 By A lorneys,

5 INVENTOR 1 Patented May 17, 1927.

UNITED STATES i 1,628,856 PATENT* OFFICE.

IsAAo PATRicK, 'oF'JAMA1cA, NEW Yong.

coivrrosrrn BLADE non Soissons, sHEARs, 15nd AND voUrrERs rnrziarnit lL(v Application med may 23, 1925. 'serial Noj 32,316.

struction whereby an'improved cuttingac tion is secured, and a simple and secure connection between the parts of said blade is obtained. The improved construction is simple and well suitedfor large scale manufacture.

The invention provides a cutter or'cuttingl part which, with the parts of the fastening means formed thereon, is readily madefrom a flat strip of metal. K j .t

An embodiment of the inventionis illustrated inthe accompanying drawing, 'wheref embodyingthe composite blades. Y

Fig. 2 is a longitudinal sectional view through a pair of blades. y

Fig. 3 is a cross-sectional view-on the line III-III, Figure 1, through a pair. of blades. Fig. 4 is a cross-sectional View (enlarged) on the line IV-IV, Figure 1.

Fig. 5 is a cross-sectional view on the line III-III, Figure 1, showing the position of the blades with respect to the plane passing through the edges of a pair of blades at their point of meeting.

Fig. 6 is a side view of the part of the composite blade which supports the cutter.

Y Figs. 7 and `8 are respectively side .and edge viewsof a cutter. f

Beferringxto .Said drawing, numerals10, ,11 indicate a pair of yblades having handles 12, 13 ,forming ascissors, the blades of which .are lpivotedfas indicated at 1,5, said blades being adapted. to be opened and closed by Va ,Separation andr bringing together of the `handles 1 2, 13 in the usual and wellunderstood manner. One yor both of theblades, .10, 11 is .a composite blade, and as ,herein shown,.bo th,of said blades are ofthis type. The r`composite blade .comprises a Vcutter or cutting portion 17 and a supportingportion rllhe cutter 17 is preferably in ,the form of athin flexible flat strip of metal having a sharpened edge ,20' thereon .constituting .a cutting -.edg.e. The .supporting portion .18, on its linner face, fis provided `with a shallow Figure 1 is a side view of a pair of scissorsv recess 22, in which the cutter 17 is adapted to fit or lie, andbe fastened. The said sup-' porting portion 18 at the lower vpart of the recess 22, opposite theV cutting edge 20 (when saidcutter is' in said recess) is preferably provided with a shoulder 25 adapted to firmly support the said cutter 17 and to sustain the strain exertedl on the' said cutting edge 2O in the -act of cutting.

Means are provided for fastening the cutten-17 and the supporting portion 18 together. These meansare of such a character that the cutter 17 is substantially flat and vvery welllsuitedfto manufacture, kpackaging and use.

The 'fastening means comprise'a pin 3()` and the corresponding sloty or socket 31, the

lpin 30 being preferably provided upon the supporting portion 18, and they slotBl in the blade '17. The pin 30 is preferably formed with a inward taper,'as shown, and a part of the blade adjacent said slot or socket 31 is preferably made resilient, so as to spring over and hug' or engage'the said pin 30, Vthe said portion of the blade adjacent said slot 31, being split, asr indicated.,

by. the slits 31. The slits 34 preferably run longitudinally of the cutter '17, and preferably the shoulder 25 opposite the slit 'por-V tion of the cutter, as indicated at 36, is omitted, so kthat the resiliency of said part of the cuttef'is not prevented byjsaid shoulder `25. At the same time the shoulder 25, as heretofore stated, bears the strains on said cutter due to cutting, and relieves ,the fastening means'frorn the duty of Abearing such strains. vThe fastening means, however, could vbe arrangedA to bear'part orall of the strains. One or `more fastening means similarto the parts 30,' 31 could beV employed, but in practice one suchmeans in the midportion of the cutter `is found to be suflicier'it.l lThe vinner end of the cutter is preferably shaped `to fit beneath a'shoulder 38 `on the supporting part 18, Vopposite the shoulder 25, and these two shoulders 38 and 25 serve toglimitthe edgewise movement of said cutter, and the opposite blade serves to 'hold the-inner end vof the cutter `against lateral displacement in said recess `22.

lAsa means rO f steadyingand lresisting the l tendency yof the cutter to cant or twist in .the frecess 22, the said cutterv may be prorlhe ribsor projections l0, 41 are conveniently formed by punching the metal of the cutter, and grinding if necessary, to provide a close lit with the walls Vof the recesses 4t2, 48. n

The'supporting portions 18 of the blade are preferably bowed from their pivotal connection toward their outer ends, the tips of the two blades, when the scissors are open, being slightly crossed, and when the tips are together, the said blades are under tension due to the forcing apart of one blade by the other as the edges of 'the cutters cross progressively lengthwise of the blades. The cutters 17 are preferably thin and som-ewhat iexible, and the fastening means 30, 31 are such as to hold the cutter flexed in the recess 28 in substantial conformity with the bowed contour of the said supporting portion 18. As heretofore stated, the slotted portion of the cutter engages the pin 31, and this engagement is in'iproved by the tapered construction of the said pin 31. The back or broad faces of the recesses 22 of a pair of blades, and the substantially flat cutters 17 lying in said recesses, are preferably slightly inclined with relation to a plane 50 passing between the said blades at the point of the meeting edges of the said cutters, as illustratedin Fig. 5. This arrangement insures the cutting edges passing one another in contact successively the length of the cutters, as the blades are opened and closed.

The cutter 17 may be formed of flat sheet metal, and may be given a very hard temper, which enables a cutting edge to be provided which is more durable than that of the ordinary one-piece blades. Moreover, with the type of scissors herein described, adjustment of the cutting blades does not get out of order, due to sharpening, as in the ordinary one-piece blades, since the two cutting edges of the composite blades, even when one cutter 1.7 is substituted for another, always maintain their proper relation or tension.

When a cutter becomes dull, it may be replaced by another', the pin and slotted portion of the blade being forced or sprung apart, by separating the cutter and supporting part at one end, and inserting and sliding toward the pin a narrow prying instrument such as a knife blade, and thereby forcing the blade olf of the pin. A new cutter 17 is replaced by placing the cutter in the recess, forcing the resilient portion around the slot 31 to yield to allow the pin 30 to pass into said slot 31, and the cutter is thereupon pressed flat against the back side of the recess 22.

The supporting portion 18 of the blade may be formed of aluminum or other light metal such as now known possessing a hardness and strength similar to steel, by die shaping or casting. By this method, close uniformity in the size and shape of the supporting portions 18 of the blades may be obtained, which would thus render the substitution or renewal of cutters 1'? being made without diliiculty.l A uniform fit between the supporting part 18 and cutter 17 used to replaceotherfcutters, is thus obtained.

The pin 8O is preferably a hardened steel pin fitted onto the said portion 18 of the blade. The portion of the part 18 iinmediately adjacent the pin 30 may be milled out, as indicated at 55, to insure the cutter lying fiat in the recess 22.

` The two blades 10, 11 are preferably resiliently drawn together at the pivotal con- Serial No. @12,829, tiled October 10, 1924,

and Serial Nos.'

April 16, 1925.

rilhe invention may receive other Aembodiments than that herein specifically illustrated 28,505 and 23,506, filed vand described, and may be applied to otherV types of scissors and shears than that herein illustrated. y

What is claimed is:

1. A. composite blade comprising a cutter and a supporting part, and means for re'- movably fastening said parts together, said means comprising a pin andslot connection between said cutter and support-ing part, said connection being resilient whereby said parts may be resiliently held together.

2. A composite blade comprising a cutter and a supporting part, and meansl for removably fastening said lparts together, said means comprising a pin and slot connection between said cutter and supporting part, said cutter having the slot formed therein and being split adjacent said slot to malte said cutter resilient adjacent said slot.

231A composite blade comprising a cutter and a supporting part, and means for removably fastening said parts together, said means comprising a pin and slot connection between said cutter and supporting part, said cutter having the slot formed therein and being split adjacent said slot to make said cutter resilient adjacent said slot, said supporting part having means for supporting the'edgc of said cutter opposite its cutting edge, said supporting means, however, beneath said split Ypart of said bladebeing omitted.

4. A composite blade comprising a cutter and a supporting part, and means for removably fastening said parts together, said means comprising a pin and slot connection between the ends .of the cutter, and shoulders lill) at the inner end of the cutter retaining said end against edgewise displacement, the opposite `blade retaining said cutteron said support against lateral displacement.

5. A composite blade comprising a cutter and a supporting part supporting the cutter throughout its length, and means for removably fastening said parts together, said supporting part being bowed longitudinally, said cutter being flexible, and said fastening means holding said cutter in flexed condition substantially conforming to the bow of said supporting part.

6. A composite blade comprising a cutter and a supporting part supporting the cutter throughout its' length, and means for removably fastening said parts together, said supporting part being bowed longitudinally, said cutter being flexible, and said fastening means holding said cutter in flexed condition substantially conforming to the bow of said supporting part, said fastening means comprising a pin and slot connection between the ends of the cutter.

7. A composite blade comprising a cutter and a supporting part, and means for removably fastening said parts together, said supporting part being bowed longitudinally, said cutter being flexible, and said fastening means holding said cutter in flexed condition substantially conforming to the bow of said supporting part, said fastening means comprising a pin and slot connection between the ends of the cutter, said pin being tapered, and said slotted part resiliently engaging said tapered pin.

8. A composite blade comprising a cutter and a supporting part, and means for removably fastening said parts together, vsaid cutter having its outer face inclined to a plane passing through the cutting edges of two cutters at their point of meeting.

9. A cutter for a composite blade having part of a fastening means thereon, said part comprising a slot adapted to fit a pin, said cutter being slit adjacent said slot to render the slotted portion resilient.

10. A cutter for acomposite blade having part of a fastening means thereon, said part comprising a slot adapted to fit a pin, said cutter being slit longitudinally.adjacent said slot to render the slotted portion resilient.

l1. A cutter for a composite blade having part of a fastening means thereon, said part comprising a slot intermediate the ends of the cutter adapted to t a pin, and` said cutter having projections thereon for engaging slots in the part of the blade to which the v l2. A cutter for a composite blade having part of a fastening means thereon, said part Y comprising a slot adapted to fit a pin, said cutter being notched at its inner end to engage a shoulder on the part of the blade to which the cutter is fitted.

13. A cutter for a composite blade havino part of a fastening means thereon, sai part comprising a slot adapted to fit a pin, said cutter-being slit adjacent said slot to render the slotted portion resilient, said cutter being notched at its inner end .to engage a shoulder on the part of the blade to which the cutter is fitted. Y

14. A cutter for a composite blade having'` part of a fastening means thereon, said part comprising a slot adapted to fita pin, said cutter being slit adjacent said slot to render the slotted portion resilient, said cutter having projections thereon for engaging vslots in the part of the blade to which the cutter is fitted.

v l5. A composite blade comprising a cutter and a supporting part, and means for fastening said parts together, saidcutter being a flat plate, said fastening means comprising parts on said cutter lying in the planes of the faces of said plate, and said supporting part having a longitudinal recess in its linner face into which said cutter is adapted to fit, said recess having a shoulder'fat its lower side for supporting said cutter opposite its cutting edge, said recess extending to near the pivotal point of the scissors, atA

a part of the'blade which is partly coveredv isAAc PATRICK.

Images