US2355364A

US2355364A - Scissor

Info

Publication number: US2355364A
Application number: US502745A
Authority: US
Inventors: Maurice L Cohn
Original assignee: CHANGE A BLADE CORP
Current assignee: CHANGE A BLADE CORP; CHANGE-A-BLADE Corp
Priority date: 1943-09-17
Filing date: 1943-09-17
Publication date: 1944-08-08
Anticipated expiration: 1961-08-08

Description

1944. M. L. COHN 2,355,364

' SCISSORS 4 Filed Sept. 17, 1943 lllllllllllll 3 IN V EN OUL Patented Aug. 8, 1944 SCISSOR New York, N. Y., assignor to Maurice L. Cohn,

OFFICE Ghange-A-Blade Corporation, New York, N. Y., a corporation of New York Application September 17, 1943, Serial No. 502,'745

(c. 3o-260) 'I portions herein termed handle members," 2 and 1 Claim.

4 This invention relates to scissors havingremovable blades, andto means by which said blades may be readily and securely fitted on the blade-retaining elements. I

One of the objects of the present invention is to provide a removable blade of the character described, preferably made by being stamped from relatively thin sheet metal in accordance with the manufacturing method disclosed in U. S. patent to William A. Zeidler, No. 2,177,41i, and which shall be provided with means by which such a relatively thin sheet metal blade will be materially stiffened and made rigid to withstand cutting strains imposed upon it without becoming bent or distorted. The invention contemplates the provision of a turned-over reinforcement or fiange extending along the rear edge of the blade and constituting a i stifiening spine therefor.

The lnvention also contemplates an improved means for attaching ,the blade to its holder whereby the blade is held in a secure, non-Shiftable relation to its holder, yet in such a manner as to permit speedy removal and replacement of the blade. I i

A'still further object 'of the inventionis to provide in a scissors, means by which the pivot pin may be adjusted easily and by which any set adjustment of said pin, and consequently the relative adjustmeritof the blades to one another, may be readily Secured and-indefinitely maintained. i

These and other' objects are accomplished by the invention, amore particular description of which will appear hereinafter and be set forth in the claim appended -hereto.

In the accompanying drawing, fcrming a part hereof,`-Fig. is a'front elevation of a scissors constructed in accordance with the invention; Fig. 2 shows the opposite face of 'the scissors, with the scissors in open position; Fig. 3 is an edge view of the scissors; Fig. 4 is a sectional View on the line 4-4 of Fig. 1, looking in the direction of the arrows; Fig. 5 is a sectional view on the line 5-5 of Fig. 1, looking in the direction of the arrcws; Fig. 6 is a sectional View on the line 6-6 of Fig.' 2; Fig. "I is a View looking at the inside face of one of the handle members; Fig. 8 is a face View of one of the detachable blades; Fig. 9 is an edge View of one of the blades; Fig. 10 is a face view of a section of sheet metal of curved conformation, showing how the scissor blades are cut obliquely therefrom, and Fig. 11 is an edge view of said section of metal.

3, a pivot pin 4, and the two detachable blades 5, one of each of said blades being detachably Secured to each handle member in the manner hereafter set forth. Each handle member is provided with the conventional finger hole 6 by means of which these members are engaged to enable the scissors to be operated in the known manner. Close to the -pivot 4, each of the

handle members

2 and 3 has a portion removed equal to the thickness of the blade 5, and this extends clear to the ends or pointed extremities 'l of the handle members.

As is well known, in ordinary scissors, it is necessary to give the cutting edges a peculiar shape and adjacent to these edgesthe scissors have warped or twisted surfaces. I attain this desired shape in the blades of the present invention by constructing them in the manner set forth in the Zeidler Patent No. 2,177,414 heretofore referred to.

Each of the blades is of tapering shape as disclosed in the drawing, and has a wider end or base H and a pointed extremity l8. Near the base I 'I is provided a hole 8 through which the pivot pin 4 passes. Adjacent to the hole 8 is another and smaller hole 9 which closely ts around a small stud [0 projecting from the inside face ll of one of the handle members. Nearer to the point or tip IB of the blade is provided another small hole l2 which is drilled or punched diagonally through the blade. In other words, said hole I 2 inclines upwardly or in a direction toward the tip of the blade,- as will be clearly seen in Fig. 6. Adapted to engage and closely fit within the diagonal hole I 2 is a diagonally extending stud !3 projecting from the inside face of the handle member. From the foregoing, the manner in which one of the blades is fitted onto a handle member will be readily understood; The hole !2 is first engaged with the diagonal stud |3 by The improved scissors is composed of two body sliding the blade 5 longitudinally toward the pivot opening in the handle member until the stud moves into the hole. This will serve to line up hole 9 With the stud IU so that said stud will now engage with the hole. When the two blades have been applied to the handle members in' the manner described, the pivot pin 4 is then inserted through the handle members and through the holes 8 in the two blades. Since the blades can only be detached from the handle members by longitudinal movement of said blades to thereby detach studs l3 completely from the holes !2, and since such lon-gitudinal movement of the blades relative to the handle members' is pre- Vented by the e'ngagemeht of the pivot pin 4 with the holes 8, and also by the engagement of the studs o with the holes 9, it is obvious that the blades will be firmly secured to the handle members until it is desired to manually remove them. To do this, the pivot pin 4 is first removed. Then the blade is Sprung laterally to an ezxtent suflicient to disengage the stud from the hole 9. Next the blade is slid longitudinally, or in a direction toward its tip, and this longitudinal movement of the blade will free the stud !3 from I the diagonal hole !2 and thus completely free the blade from the handle member. v

In the manufacture of the as indicated in Fig. 11. The blades are cut obliquely from this curved sheet, leaving openings therein substantially as'shown at 15.' Since each blade is cut from an arched or 'curved 3 sheet and at an angle thereto, the resultant blade is not onlyslig'htly arched-longitudinally but the blades have a, slight desirable transverse twist. This arched and 'twisted arrangement of the blades, secured in each blade by the manner in which the blade is cut from the sheet, as distinguished'irom being formed by grinding of the blade, causes the two co-oper-' ating blades to be` held in perfect shearing re'- lationship. It also insures 'the uniformity of all blades. .As the blades are stamped out from rela'tively thin sheet metal, it is desirable that each 'blade shall be reinforced or stifiened; I attain this' rest firmly against the long'itudinaledges 9 of the handle parts, this engagenentoi" the blades With saidvparts acting to materially stiffen and strengthen the blades. t will also be noted rom Figs. 4 and 5, that ?the widthof each ofj the fianges '16 is no greaterthan the thickness of the handle parts against which ,these ;flanges are disposed, so that' a smooth taperingeffectisf'obtained bythe fitment of theblades against; 5 5

the handle parte in the manner described 'I'hepivot'pin 4 consists of a simple threaded stud which freely passes through an unthreaded' blades, a sheet oi metal !4 is employed, said sheet being curved,

ual force.

hole 2!) in one of the handle members, and is threadably received in an internally threaded hole 2| in the second handle member. The hole is counter-sunk as indicated at 22 to receive the head 23 of the pin. As will be noted in Figs. 2 and "I, the threaded hole 2| has lateral slot extensions in the form of the lengthy oppositely disposed s1ots .24 and-25. .The parts of the handle members on` opposite sids of these slots may be Sprung by the entry of the stud 4 thereinto, so that the threaded hole 2l may be made slightly undersize.

-' threads in hole 2l will bind slightly on those As a result the of the studsothat the stud can only be turned within the ho1e2lyby the exertion of some man- Through this arrangement, the adp justment between the two blades of the scissors i can 'be regulated and consistently maintained.

The" threaded hole 2| engages the threads on the pivot pin with sufficient friction to prevent rotative movement of the pivot pin during normal cutting use of the scissors. However, when it is desired to change the clearance between the blades, a screw driver 'engaging the slot in the head 23 of the pivot 'pin can overcome the frictional resistance of the threads in the hole 2| on those of the'pivot pin and enable the pin to be manually turned in the desired direction to permit of precise adjustment of the blades. i

While I have shown an embodiment of'the invention, it is obvious 'that the same is not to be restricted thereto, but is` broad enough to cover all structures coming within 'the scope of the annexed claim. r

What I claim is:

A scissor having a detachable blade, said scissor having a handle part provided with a pivot-pin 40 opening, a shank formed integrally with the handle part and extending rrom the pivot-pin opening toward the tip of the blade but terminating at a distance from said tip, a detachable blade removably secured against a face of the shank, the blade'being of tapered form and extending beyond the end of the shank and having a bentover flange extendingalong its rear edge only and at right angles to the bodypf the blade,

the shank extending over and covering one face of the blade for the greater part of the length of the blade with a part of the blade ;extending beyond the shank to form a relatively sharp point, said blade being stiffened by the shank, the shank having a flat edge disposed against the flange of theblade and havingitsopposite edge =tapering toward the cuttin'g edge of thebIadeL i e vL U Ici:(L. COHN.