# US 12,109,718 B2 · Razor head

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- Number: US 12,109,718 B2
- Document ID: US12109718B2
- Status: Granted
- Kind: B2
- Application number: 17/630,661
- Filed: 2019-09-10
- Published: 2022-08-18
- Granted: 2024-10-08
- Earliest claimed: 2019-07-31
- Assignees: Kai R&D Center Co., Ltd.
- Applicants: Kai R&D Center Co., Ltd.
- Inventors: Kengo Hashimoto
- Web page: https://patentgrep.com/patent/US12109718B2

## CPC

- B26B 21/4012: {Housing details, e.g. for cartridges}
- B26B 21/222: {with the blades moulded into, or attached to, a changeable unit (B26B21/4006 takes precedence)}
- 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 razor head includes a frame, elongated blades arranged on an inner side of the frame, and two bridge walls each extending between two points of the frame in an interior of the frame, the bridge walls each including projections arranged in an arrangement direction of the blades. Each of the blades is held between adjacent ones of the projections of the bridge walls. Each of the projections includes a first flat surface and a second flat surface. In each of the bridge walls, the first flat surface and the second flat surface are shifted from each other in a longitudinal direction of the blades so as not to overlap each other, and the first flat surfaces and the second flat surfaces are located on the same position as viewed in the arrangement direction. Each of the projections has a horizontal cross-sectional shape of a parallelogram.

## Claims

### Claim 1

A razor head, comprising:
a frame; and
elongated blades arranged on an inner side of the frame, wherein the frame includes:
two opposing long side walls; two opposing short side walls; and first, second, and third bridge walls each extending between the two opposing long side walls in an interior of the frame,
the first bridge wall extends between a middle of the two opposing long side walls in a longitudinal direction of the frame,
the second bridge wall and the third bridge wall extend on opposite sides of the first bridge wall, respectively,
the second bridge wall and the third bridge wall are symmetrical with respect to the first bridge wall,
a length of the first bridge wall in the longitudinal direction is greater than lengths of the second and third bridge walls in the longitudinal direction,
the second bridge wall has a first narrow portion recessed from a side surface of the second bridge wall facing the first bridge wall and the third bridge wall has a second narrow portion recessed from a side surface of the third bridge wall facing the first bridge wall,
the first and second narrow portions between the two opposing long side walls are portions where the second and third bridge walls are connected to one of the two opposing long side walls, the second and third bridge walls each including include protrusions projections arranged in an arrangement direction of the blades,
a length of each of the protrusions in the longitudinal direction is equal to the lengths of each of the second and third bridge walls in the longitudinal direction,
each of the blades is held between adjacent protrusions of the second and third bridge walls,
each of the protrusions includes:
a first flat surface that is in contact with one of the blades located on one side of the protrusion in the arrangement direction;
a second flat surface that is in contact with another of the blades located on the other side of the protrusion in the arrangement direction; and
a third flat surface and a fourth flat surface that are inclined with respect to the first flat surface and the second flat surface,
the first flat surface is parallel to the second flat surface,
the third flat surface is parallel to the fourth flat surface,
in each of the second and third bridge walls,
the first flat surface and the second flat surface are offset from each other in a longitudinal direction of the blades so as not to overlap each other as viewed in the arrangement direction, and
the first flat surfaces are located on the same position as viewed in the arrangement direction and the second flat surfaces are located on the same position as viewed in the arrangement direction.

### Claim 2 (depends on 1)

The razor head according to claim 1, wherein each of the first flat surface and the second flat surface of each of the protrusion has the same length in the longitudinal direction of the blades.

### Claim 3 (depends on 1)

The razor head according to claim 1, wherein a space is provided between the frame and each of two ends of the blades in the longitudinal direction.

### Claim 4 (depends on 3)

The razor head according to claim 3, wherein
each of the second and third bridge walls includes leaf springs that protrude in a direction away from the other one of the bridge walls, and
each of the leaf springs supports a corresponding one of the blades.