US2373607A

US2373607A - Scissors

Info

Publication number: US2373607A
Application number: US547652A
Authority: US
Inventors: Francis A Snell
Original assignee: CHANGE A BLADE CORP
Current assignee: CHANGE A BLADE CORP; CHANGE-A-BLADE Corp
Priority date: 1944-08-02
Filing date: 1944-08-02
Publication date: 1945-04-10
Anticipated expiration: 1962-04-10

Description

April 10, 194-5. SNELL 2,373,607

SCISSORS Filed Aug. 2, 1944 INVENTOR. Francis 4. Snell fitment of the blades on the shanks dles is attained.

Patented Apr. 10, 1945 v UNITED STATES FIes 1 7 Claims. (.01. 30-349) This invention relates to scissors having removable blades, and to means by which the blades may be readily and securely fitted on the bladeretaining elements of the scissors. I

An example of scissors of the type to which v the invention relates will be found in U. S. patent to Zeidler, No. 2,177,414, and to M. L. Colin, No.

In'both' of these patents is shown a scissors having handle parts provided with. extending shank portions on which the blades fit, andwith interengaging elements by which each blade is fitted and held on its shank. In the structures disclosed in these patents; as well as in other patents in the art, the detachable blades are held in place by various means, such means usually including the pivot-screw of the scissors. Thisnot onlyrequires the use of a tool for removing and replacing the blades, but-the removal and replacement of the pivot screw often alters the extent of frictional contact between the cutting edge parts of the blades,so that the adjustment is changed, and wholly satisfactory cutting action is not attained from the scissors.

An object, therefore, of the present invention I is to provide a scissors in which the detachable blades may be removed and replaced without disturbance or removal ofthe pivot screw. It further contemplates the provision of means by which the blades may be removed and replaced withoutthe use of tools, and by which a secure and accurate ofthe han- A further object of the invention is to provide a blade-retaining means of 'a construction enabling the blade to be removed by a simple lengthwise manual pull on the blade, sothat the removal and replacement of a blade can be instantly done.

In the accompanying drawing, wherein an illustrative embodiment of the invention is disclosed.

Fig. Us a. face view of a pair of scissors in open position, embodying the invention;

Fig. 2 is a view of the inner face of one oftlie removable blades;

Fig. 3 is an enlarged side view of one of the handle shanks;

Fig. .4 is an enlarged view of a part of the inner face of one of the blades, showing the buttonhole opening;

Fig. 5 is a view of the inner face of one of the handles; and V Fig. 6 is a sectional view on the line 6-6 of Fig. 2.

With reference to the structure shown, land 2, 55

respectively, indicate the conventionally shaped handle'portions. lntegrallyextending from each of the handles is a shank portion 3 of reduced thickness and of tapering bladeelike form, and

provided with the pivot-screw hole 9 for' reception of the'usual pivot screw. l0. Near the screw hole 9 is a shoulder Li-and. extending therefrom, in a direction toward the tip 6 of the shank,is an integrally formed.projectionor lug 8. Near the tip 6 of the 'shankis a rounded protuberance or knob 5. ofhemispherical shape, and located between the. knob Sand the lug 8 is a stud 4 having a shank part 41) and enlarged fiat head ta. .The projecting

elements

4, 5 and 8 :are all locatedon the inside face of the shank .3, and are intended for engagement with apertures provided in. the blade [1, as will be described. t .1

' Thedetachableblade II ispreferably, but not necessarily, made from sheet metal, and the longitudinal'edge, indicated at' Ila, is the cutting edge, and; the opposite longitudinal .edge is stiffened'or reinforced bymean of a turned-down flange l2. The blade isslightly transversely con- I caved, as seen in Fig. 6, and is of tapering form.

Near its pointed extremity or tip, the blade is formed with a pair of slightly spaced apertures or holes I3 and I4, whichare. adapted to successively engage the knob 5 while the blade is being placed in position on the shank 3, and after it is positioned thereon, asz'will .be described; Properly spaced from the holes-.ii3, I4 .is a socalled button-hole aperture I 5, sometimes called the headed stud 4. -At the base or butt endof the bladeisformed a slot l9 of a shape to enable it to closely fit around the lug 8 on the shank 3.

In placing one of the blades on the handle part or shank 3, the enlarged portion l6 of the buttonhole opening [5 is placed over the head 4a of the stud 4. I At-this time, the knob 5 will'be resting in the hole I4. The blade is then pushed longie tiudinally towardthe handle part-lor 2, so, that the shank 4b of the stud 4 moves up into the narrowed part I! of the button-hole opening. The portion of the opening I 5 around the narrowed part I! is counter-sunk, thus providing a, ledge I8 which engages behind the head 4a when the blade is moved home, as described. When the head 4a is in the position just mentioned, its face will be flush with the face of the blade. This longitudinal movement of the blade causes knob 5 to snap from the inner'hole l 4 to the outer hole l3, and engage therein, where it serves to lock the blade against endwise movement until it is intentionally moved by pulling it in a direction toward gagement of the head of the stud 4 with the.

countersunk portion of the aperture l5, and will be held against the force of the cutting action.

by the stud 4 and the retaining lug 8.

While the elements described. securely afilx the blade in place, the arrangement of these partsis such that the blade may be placed on, and removed from, the handle part instantly and wholly- Without the use of tools, since the blade is de-- tached by merely manually moving it in a direction towarditstip; Thus-,.in.the embodiment described, the removal. of the pivot. screw Ill: is unnecessary, and the. removal andi replacement ofa pair of blades is theworkbf an instant;

While I have described the-blade. as beings pro.- vided with means for holding it in placewithout requiring. thev employment of the: pivot. screw I for that purpose, it is;possible to1-alsozutilize;thepivot screw. for aid holding the blade inzplace; when such an-arrangement isdeemeddesirable. This, and other modifications, may be; readily made without departing fromv the spirit oftheginvention.

What I claim is:

1. In a scissors of the character described; a handle having a shank portion, said. shank'portion being provided with. a. headed stud, a blade having an aperture of. button-hole. form for receiving the stud, said: aperture. includinga. counter-sunk part. for engagement behind the; head-.of the studwhen the blade is longitudinally moved to bring the stud toward. one. end ofzsthe aperture, and cooperating meanson the; shank and blade for holding the blade against inadvertent. longitudinal movement in respect to the shank said means being located between. the button-hole aperture and 'the tip ofthe blade.

2. Ina. scissorsof the; character-described,- a handle havingia shank portion, said shank portion being provided with .a-headed stud; abladehaving an aperture of button-hole form for receivingthe stud, said apertureincluding acounten-sunkpart for engagement behindithei head of the; studwhen the blade islongitudinally moved to; bring the studtoward one end of theraperturmandmooperating means on the shank and blade .for; holding the blade againstinadverent longitudinal movement in respect to the shank; saidimeans.--com-. prising a rounded projection on the shank and an opening. in the blade engagedbysaid projection.

3. In a scissors of. the character: described, a

handle having a shank portion, said shank portion having a stud projecting from its inner face, the stud having an enlarged head, a blade having an elongated aperture of button-hole form, said aperture having a part of a size permitting passage of the head, and a, narrowed part through which the head cannot pass, and interengaging elements on the blade and shank for interengagement to hold the blade against longitudinal movement when the stud is located in the narrowed part of the aperture, said interengaging elements being located between the tip of the blade and the button-hole aperture.

4. In a scissors ofv the character described, a handle. having a blade-like shank portion provided with a rib-like lugs, a projecting headed stud and a rounded projection near its extremity, all of said elements. projecting from the inner face of the. shank, a detachable blade having an openended slot in its butt end for fitment over the lugv on. the-shank; the blade: havingv a buttonehcle aperture forfitment aboutthe stud: on the. shank, and: the, blade; also having. aplurality of spaced holes near its tipfor successive engagementwith the rounded projection when. the blade is being placed ontheshank.

5. In a scissors. of the character described, a handle having a shank, a blade for fitment theree on, the shank having a studprojecting fromits inner face, a rounded knob. also projecting from theinner face of the shank, the blade having a slot-like opening for engagement with the stud, the: opening: being contracted in part to. prevent passageof the. stud therethroug-h When the. stud is positioned. in that partof theslot-like opening, and. the bladealso having at least twoholes, one of. which engages the knob. when the studis. in position. to. pass through the opening}, and. the

other of which engages the: knob. whenthe stud is in. the narrowed. part of the opening; and cannot. pass. therethrough.

6. A scissors. as calledfor. an claim 5, wherein the, slot-likezopening is of, button-hole or keyhole shape; wherein the blade,- has. an open-end slot at its butt end; and wherein the shank .has a lug around which the open-end'slot fits when the respective interengaging; elements of the blade and shank are in cooperative relation.

'7. In a scissors of the; characterv described, a handle shank and a; blade; for attachment to one face: of .the. shank, means for; attaching. said blade, said. means including abutton-hole; opening in the blade and a headed stud on theshank entering-the button-hole opening, .means for restraining the stud from movementout of thecpening includinga rounded projection'near oneendof the shank and a hole. in the-.bladenearthetipof the blade-for. engagement with the. rounded projection when the headed stud is inengagement with: the button-hole opening.

FRANCIS A. SNELL.