# US 2023/0057750 A1 · Slide Cutting Shears

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- Number: US 2023/0057750 A1
- Document ID: US20230057750A1
- Status: Published application
- Kind: A1
- Application number: 17/394,308
- Filed: 2021-08-04
- Published: 2023-02-23
- Earliest claimed: 2021-08-04
- Inventors: Chao Wei
- Web page: https://patentgrep.com/patent/US20230057750A1

## CPC

- B26B 13/06: characterised by the shape of the blades
- B26B 13/20: with gripping bows in the handle
- B26B: HAND-HELD CUTTING TOOLS NOT OTHERWISE PROVIDED FOR (for harvesting A01D; for horticulture, for forestry A01G; for butchering or meat treatment A22; for manufactering or repairing footwear A43D; nail clippers or cutters A45D29/02; kitchen equipment A47J; {vegetable slicers, julienne cutters and similar devices and holders therefor, B26D3/28}; for surgical purposes A61B; for metal B23D; cutting by abrasive fluid jets B24C5/02; plier-like tools with cutting edges B25B7/22; pincers B25C11/02; handles for hand implements, in general B25G; guillotine-type cutters B26D; {perforating by non-mechanical means, e.g. by fluid jet, B26F1/26}; for erasing B43L19/00; for textile materials D06H)

## Abstract

A pair of slide cutting shears that have identical cutting angles of approximately 53 degrees on the thumb and finger blades, and where the thumb blade has approximately only 40% of the top end of the blade sharpened and the remaining section of the working blade is radiused and cannot cut. The shears have a four finger grip, and adjustable bump stop and a tightenable pivot pin assembly to draw the blades closer.

## Claims

### Claim 1

A pair of slide cutting shears comprising:
a finger blade having a first blunted tip, a first pivot pin orifice therethrough, a first cutting face, a first leading edge, and a four finger grip sequentially formed with a first and a second external concave finger grip, an enclosed finger grip with a finger orifice therethrough and a third external concave finger grip formed about a tail extending from said enclosed finger grip;
a thumb blade having a second blunted tip, second pivot pin orifice therethrough a second cutting face, a second leading edge opposing said first leading edge, an enclosed thumb grip with a thumb orifice therethrough, a bump tab extending therefrom said enclosed thumb grip, and a depth adjustable spherical bump stop threaded into and extending outward therefrom said thumb grip;
a pivot pin assembly made of a pivot pin with a proximal end and a distal end, and a pivot pin keeper, wherein said proximal end of said pivot pin has a gripable perimeter and said distal end is configured for tightenable, mating engagement with said pivot pin keeper to draw said finger blade and said thumb blade in closer proximity;
wherein said first leading edge has an approximately 53 degree included cutting angle between said first cutting face and a line extending perpendicularly from said first cutting face and extends an entire thickness of said finger blade; and
wherein said second leading edge has an upper cutting edge, a lower sliding edge and an interface therebetween, wherein said upper cutting edge has an approximately 53 degree included angle between said second cutting face and a line extending perpendicularly from said second cutting face and extends an entire thickness of said thumb blade, and wherein said lower sliding edge is radiused across an entire thickness of said thumb blade; and
wherein said pivot pin resides between said first pivot pin orifice and said second pivot pin orifice so as to enable pivotal movement of said thumb blade and said finger blade about said pivot pin.

### Claim 2 (depends on 1)

The sliding shears of claim 1 wherein said first cutting face and said second cutting face is planar.

### Claim 3 (depends on 2)

The sliding shears of claim 2 wherein a length of said upper cutting edge of said thumb blade is approximately 40% of a working blade length of said thumb blade and said lower sliding edge is approximately 60% of said working blade length.

### Claim 4 (depends on 3)

The sliding shears of claim 3 wherein said thumb blade leading edge does not reach or exceed a trailing edge of said finger blade when said shears are closed.

### Claim 5 (depends on 4)

The sliding shears of claim 4 wherein said shears have hardness of Rc 60 to 61.

### Claim 6 (depends on 5)

The sliding shears of claim 5 wherein the thumb orifice is larger than the finger orifice.

### Claim 7 (depends on 6)

The sliding shears of claim 6 wherein said shears are made of a drop forged stainless steel that contains 1.5-2.2% Cobalt plus or minus 0.2%, and that have been heat treated twice to between 500-1000 degrees F. and twice cold tempered in Liquid Nitrogen to minus 150-300 degrees F. so as to achieve a Rc scale hardness of 60-61.