US1671569A - Scissors, shears, and like implement - Google Patents

Description

May 29, 1928.

J. H. c. BOYD SCISSORS, SHEARS, AND LIKE IMPLEMENT Filed Aug. 5, 1926 M w I ZIQ Q 1 and the blades being aperture Patented May 29, 1928,

UNITED STATES PATENT oFF-ics SGISSOBS, SHEABS, AND LIKE IMPLEMENT.

Application filed August 8, 1826, Serial 110. 126,814, and in Great Britain May 20, 1928.

This invention relates to scissors, shears and like implements of the type comprising a pair of scissor-like elements or carriers on each of which is detachably mounted a thin flat blade or cutting element and has for its object to permit the ready attachment of the blades to the carriers without the necessit of using a screw driver or any special too so that blunt blades may be replaced with great facility.

' T he improved scissors comprise a pair of scissor-like elements or carriers, and thin blades or cutting elements detachably supported on said carriers,'each carrier being formed (a) near the tip of the blade-can ing portion thereof with a lon itudina y extending undercut recess adapte to receive a correspondingly ofi'set longitudinally extending tongue on a blade, (6) near the butt end of said portion with a transversely extending undercut slot adapted to receive the butt end of a blade, and c) with a longitudinally extending rib a apted to support the back edge of a bladei the carriers sage to the pivot pin of the implement, whereby the blades are secured in position on the carriers andthe carriers are secured and pivoted to one another.

The invention is illustrated, by way of example, in the accompanying drawings wherein Figure 1 is a front elevation of a pair of scissors, Figure 2 is a artial side elevation, Figure 3 is a partial ont elevation of a blade carrier, Figure 4 is a front elevation and Figure 5 a side elevation of a blade, Figures 6, 7 and 8 are cross-sections on the lines 6-6, 7 7 and 8-8 respectively, Figure 1 on an enlarged scale showing details.

As illustrated a pair of scissor-like elements or carriers a b are pivoted together by a pin 0 and each carries a thin blade or cutting element (1. Each carrier (1 b is formed near its tip with a longitudinally extending undercut recess e adapted to receive a correspondingly off-set longitudinally extending ton ue f on a blade d, (as shown especially in igure 7), the free end of said tongue extendin towards the butt end of the blade so that ongitudinal movementoftli' blade towards the pivot pin a is necessary to efiect engagement. At the butt end of its blade-carrying portion each to give pas-- carrier a b is formed with a transversely. extendlng undercut slot 9 adapted to receive thebutt end of a blade d (see especially Figure 8), when moved longitudinally as aforesaid, the engagement of both ends of a blade with a carrier serving to hold the former in position during assembly and to some extent when assembled. The undercut groove 9 in the carrier (1 is formed beneath an arcuate boss it (see Figure 3) the surface of which is inclined to the generalplane of said carrier as also is the opposing face-of the carrier 7). so as to serve as cams and the latter is formed at one end with a fiat head n and near its other end with a peripheral groove 0 (see .Figure 8). The carrier a has slidably mounted thereon a locking plate slotted as at g to give passage to a hea ed securing rivet r and key- 7 hole slotted as at s on the one-hand to give passage to the pivot pin 0 and on the other hand to engage in the peripheral groove 0, 1

the plate 12 being bowedso asto present frictional resistance against longitudinal movement and furnish with an upstanding end it to enable it so to be moved for the purpose of looking or unlocking the parts. The cams for the purpose of forcing together thefcutting edges of the blades (1 (1 'may be formed on the blades themselves (instead of on the carriers) by stamping out therefrom inclined arcuate ribs.

Inasmuch as a blade d can be placed in position by a mere longitudinal slidin movement it is unnecessary to ensure carefu registry of several apertures and securing means such as screws or rivets as are sometimes employed with detachable blades, and this coupled with the similar longitudinal movement of the locking plate 1) enables the arts to be assembled or separated very readily without the, use of a screw driver 'or any s ecial tool or the necessity of undoing any t umb or other screws. In use the ments being provided witha'longitudmally' tures and-means for removably securing said extending under-cut recess near its, tip end, a transversely extending under-cut slot near its butt end and a longitudinally-extending rib for supporting the back edge of the blade each of the respective blades bein provide with an ofi'-set longitudinally tongue for cooperation with the under-cut recess of the corresponding blade carrying ele-f ment, while the butt end of the blade is adapted to enter the corresponding transverse under-c-ut slot, said carrying elements and the blades being provided with coincident pivot apertures, a pivot passing through said aperpivot so that the blades may be changed when desired.

2. A scissors comprising a pair of carrier members, each provided with a pivot aperture, adapting t the tip end thereof, the under-cut surface of which lies transversely of the carrier member and extends at an angle toward the pivot, a

rib extending as a laterally projecting flange along the back edge of each (Farrier member,

said rib being of substantially the same thickness as and adapted for supporting the back edge of a detachable blade, a detachable thin "f metal scissors blade for each carrier member,

each blade being provided with a pivot aperture adapted to register with the pivot aperture of the corresponding carrier member and a punched-out ton ue near the tip end of the blade, having its ace lying-transversely of and its free end extending at an angle totending e carrier members to be piv oted together, and an under-cut recess near ward the pivot end of the blade and adapted for coperative engagement vwith'ithe corresponding under-cut recess of the carrier member, said engagement being effected by a sliding movement-of the blade ongitudinally along the face of the carrier member inthe Tlirection of the pivot, 'and a pivot pin passing through said pivot apertures for securing the carrier members together and for holdingithe' respective blades in position, the a'rrangement 'and relative dimensions being I such that when pivoted together the tongues ofthe'blades fit loosely in the respective under-cut recesses of the carrier members so as to take none of the cuttin thrust, all of which is adapted to be ta en by the ribs of said carrier members.

3. The scissors as claimed in claim- 2, wherein the tongues'of the blades are adapted to fit in the under-cut recesses so loosely as to rmit the backs of the blades to engage sai ribs so that the latter take the entire cut- :ing thrust of the blades, and said ribs extend beyond the recesses in the -carrier members so as to take the thrust of the blades beyond the tongues thereof.

4. A carrier member for detachable scissors blades, provided with a pivot'aperture and an undercut recess, the latter being between the pivot aperture and the tip end of said member and having the under-cut sur: face thereof lying transversely of the member and extending atan angle toward the pivot aperture, and a rib comprising a flange projecting laterally of the face of the member, approximately the thickness of the blade to be used, and extending along the back of said member for supporting the back of the detachable blade, said rib extending beyond said under-cut recess so as to provide a support for the end of the blade at andbeyond said recess.

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