US2508706A

US2508706A - Pinking shears

Info

Publication number: US2508706A
Application number: US757565A
Authority: US
Inventors: Maurice L Cohn
Original assignee: CHANGE A BLADE CORP
Current assignee: CHANGE A BLADE CORP; CHANGE-A-BLADE Corp
Priority date: 1947-06-27
Filing date: 1947-06-27
Publication date: 1950-05-23
Anticipated expiration: 1967-05-23

Description

Patented May 23, 1950 PINKING SHEARS Maurice L. (John, New York, N. Y., assignor to Change-A-Blade Corporation, New York, N. Y., a corporation of New York Application June 27, 1947, Serial No. 757,565

This invention relates to pinking shears or scissors, with particular reference to those in which the cutting blade and the fabric-guiding means borne thereby are included in a single detachable element, permitting their replacement when dull or damaged.

An object of the invention is to provide in a structure of this character, means by which effective cutting of a zig-zag edge, commonly known in the trade as a pinking edge," will be effectively produced in either light or relatively heavy or thick fabrics, means being included by 2 Claims. (Cl. 30-230) which the fabric to be pinked is effectively guided to the toothed edges of the cutting blades.

Another object of the invention is to provide in a scissors of this character, a construction by which the blades, and the fabric guide members carried thereby, shall be removable from handle and replacement of these elements; of means by which the cutting and fabric-guiding elements may be preferably stamped or otherwise produced from sheet metal, thereby enabling the scissors to be manufactured economically, but of structurally sound construction. I

Still another object of the invention is to provide in a pinking scissors, the normal features of the conventionalstraight-edge shears, namely, the twist in the blades as well as the hollow ground effect which provides a most effective shearing action.

These and other objects are attained by the invention, a more particular description of which will hereinafter appear and be set forth in the claims appended hereto.

In the accompanying drawing, forming a part hereof, and in which an illustrated embodiment held removably on one of the shanks 3.

of the invention is disclosed, Fig. 1 is a face view of a pair of pinking scissors or shears constructed in accordance with the invention; Fig. 2 is a view of the inner face of one of the blades with the fabric-guiding member secured to the same; Fig. 3 is a face view of the opposite side of the blade; Fig. 4 is a sectional view on the line 4-4 of Fig. 2, looking in the direction of the arrows; Fig. 5 is a face view, on an enlarged scale, of one of the fabric-guiding members; Fig. 6 is a view of the opposite side of the fabric-guiding member, and Fig. '7 is a sectional view on the line 1-1 of Fig. 5, looking in the direction of the arrows.

With reference to the structure shown, I and 2, respectively, indicate the conventionally-shaped looped handle portions of the scissors. Integrally extending from each of the looped handles 2 tapering blade-like form, and provided with a hole for the reception of the pivot screw 4. The pivot screw may be of the conventional type employed in scissors, or it may be an adjustable type, such as shown in U. 8. Patent No. 2,382,341, dated August 14, 1945, to F. A. Snell, which can be effectively used for the pivoting of the handles together.

Each of the shanks 3 is provided with a headed stud 5 on its inside face adapted for detachable engagement with a slot 6 of the keyhole type provided in the cutting blades. Each of the

cutting blades

8 and 9 is provided with a hole 1 near its butt end through which the pivot screw 4 passes, so that each of the

blades

8 and 9. is thus This means for attaching a blade is shown in U. 8. Patent to Snell, No. 2,373,607, dated April 10, 1945, and is preferably but not necessarily, employed for holding the pinking blades of the scissors attached to the shanks of the handles.

The

blades

8 and 9 are similar in construction, except that the teeth onone of the blades are arranged to pass at points between the teeth of its companion blade when the two blades are moved shearingly together, and thus the two blades are not interchangeable but are made in pairs to secure this result. Each blade is preferably stamped from sheet metal and its inner face, indicated at [0 is transversely curved or hollowed, as seen in Fig. 4 in the known manner of scissor blades, and the forward or cutting edge of the blade is provided for the greater portion of its length with the teeth or serrations II. As previously stated, the similar teeth or serrations on the companion blade are positioned so that when the two blades are brought together in the cutting or pinking operation, the teeth on one of the blades will pass between those on the other blade. This is known. in pinking construction.

In addition to being provided with the hollow inner face In, each blade is also provided with a slight twist in the known manner of conventional straight-cutting scissors. At its rear edge, the blade is provided with a laterally bent flange II a against which one of the edges of the shank 3 fits as clearly seen in Fig. 1, said flange ll tending to add material stiffness to the blade.

At I 2 is shown a fabric guide member which is in the form of a thin metal blade secured to the outer face of each of the

cutting blades

8 and 9 by the rivets l3 and I4 located near the opposite ends of the guide member II. The guide memis a shank portion 3 of reduced thickness and of be her is widened at one end. as indicated at II and 3 atitsrearedgeitiscurvedortapered-asshown at it to clear the guide member is provided with a curled or rolled edge constituting a bead l'l which extends for the length of the toothed edge portion of the cutting blade on which the guide member is attached. When the guide member is attached to the cutting blade as shown in Fig. 1, it will be noted that the bead i'l extends beyond the teeth II and overhangs or projects over the pointed terminals of the teeth in the manner most clearly seen in Fig. 4. It will be therein noted that the rounded edge of the bead i'l projects over the ends of the teeth for a substantial portion of the width of the teeth, or for a distance of approximately one-half of the thickness of the teeth. The free end it of the bead is extended outwardly or away from the teeth, so that the fabric passing between the teeth during the cutting or pinking operation, is forced or guided between the teeth by the inner rounded portion is of the bead II on each of the guide members, and the result is that a perfect zig-zag or pinking cut is attained.

It will be noted that the edge of each cutting blade on which the teeth H are produced is curved and hence the beaded edge ll of the guide member I! following the toothed edge of the blade is corresponding curved. The teeth of cutting blade thus formed on an arc.

In the operation of the scissors, the fabric is placed between the cutting edges and as the handles l and 2 are manipulated to bring the blades toward one another, and the rounded or beaded edges of the guide members I! will engage the fabric and direct it between them into the toothed edges of the cutting blades 8 and I. It will be observed that the guide members I! are secured to the

blades

8 and 8 by the rivets l3 and It located at the ends of the guide members l2, and since the guide members are composed of relatively thin and flexible metal, the

guide members will possess considerable resiliency between their points of attachment to the shank 3. Along its outer edge.

the same can be replaced when dulled or-damaged by simply removing the pivot 4 and sliding the blades endwisely or toward their tips to free the studs I from the slots 6. This at once permits separation of the blades and the guide members I! carried thereby, from the shanks I, and new blades can be replaced immediately.

Having described one 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 claims.

What I claim is:

1. A pinking shears comprising, a pair of pivotally connected handles having integral shanks, a cutting blade detachably secured to each shank. each blade being provided with a serrated edge, a guide blade attached to the outer face of each cutting blade, each guide blade having a distorted edge, said distorted edge being curled inwardly to at least partly overhang the ends of the serrations on the cutting blade to which the guide blade is attached, and thence bent outwardly and away from the ends of said serrations.

2. A pinking shears having a pair of handles pivotally connected together, a blade on each handle, each blade having a serrated cutting edge, a guide member in the form of a thin blade attached to the outer face 01' each of the cutting blades, each guide member having a longitudinal edge which is curled inwardly and then outwardly to form a rounded bead, said bead presenting a rounded surface over the ends of the serrations on the cutting edge, said head terminating in an edge located outwardly and away from the serrations.

MAURICE L. COHN.

REFERENCES CITED 0 The following references are of record in the cutting blades and are thereby enabled to ac- I commodate various thicknesses of fabric being cut by the scissors. This adaptability of the guide members to the materials being cut eflectiveiy enables accurate and precise pinking to be performed on thick and thin fabric alike.

Due to the detachable mounting for the blades,

file of this patent:

UNITED STATES PATENTS Number Name Date 291,591 Gorton Jan. 8, 1884 360,159 Keatlng Mar. 29, 1887 2,382,341 Snell Aug. 14, 1945 FOREIGN PATENTS Number Country Date 544,955 Germany Feb. 24; 1932