# US 7,743,507 B2 · Rotary type electric shaver

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- Number: US 7,743,507 B2
- Document ID: US7743507B2
- Status: Granted
- Kind: B2
- Application number: 11/353,669
- Filed: 2006-02-14
- Published: 2006-08-17
- Granted: 2010-06-29
- Earliest claimed: 2005-02-15
- Assignees: Izumi Products Company
- Inventors: Tsuyoshi Nakano
- Web page: https://patentgrep.com/patent/US7743507B2

## CPC

- B26B 19/141: {Details of inner cutters having their axes of rotation perpendicular to the cutting surface}
- B26B 19/143: {Details of outer cutters}
- 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 rotary type electric shaver with an outer cutter frame provided on a shaver main body. An outer cutter installed in this outer cutter frame and having its shaving surface on the upper surface of a ring-shaped thin layer portion. An inner cutter 16 having a cutter body that rotates and makes sliding contact from below with the lower surface of the outer cutter 14, wherein a thin layer portion 28 is formed in a substantially arc shape that is convex upward in a radial and vertical cross section that includes a center axis line which is the rotational center of the inner cutter. The thickness of the thin layer portion near the apex of the upward convex is smallest at the apex and gradually becomes thicker as distance increases away from the apex.

## Claims

### Claim 1

A rotary type electric shaver comprising an outer cutter frame tat is provided on a shaver main body, an outer cutter that is installed in said outer cutter frame and has a shaving surface on an upper surface of a ring-shaped thin layer portion thereof, and an inner cutter that is driven rotationally and has a cutter body which makes sliding contact from below with a lower surface of said thin layer portion of said outer cutter, wherein
said thin layer portion has a substantially arc shape that is convex upward in said radial and vertical cross-section that includes a center axis line which is a rotational center of said inner cutter,
a thickness of said thin layer portion is smallest near an apex of said convex arc shape and becomes larger as a distance from said apex increases, and
said shaving surface of said outer cutter is formed therein with a flat surface portion that is not orthogonal to said center axis line.