# US 7,607,229 B2 · Electric razor

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- Number: US 7,607,229 B2
- Document ID: US7607229B2
- Status: Granted
- Kind: B2
- Application number: 11/658,555
- Filed: 2005-07-25
- Published: 2008-12-18
- Granted: 2009-10-27
- Earliest claimed: 2004-07-30
- Assignees: Matsushita Electric Works, Ltd.
- Inventors: Ryo Motohashi; Hiroaki Shimizu; Noboru Kobayashi
- Web page: https://patentgrep.com/patent/US7607229B2

## CPC

- B26B 19/288: {Balance by opposing oscillation}
- B26B 19/282: {Motors without a rotating central drive shaft, e.g. linear motors}
- 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

An electric razor including an actuator, an outer cutter and an inner cutter. The actuator has a first vibrator and a second vibrator. The outer cutter and the inner cutter are respectively supported at the first vibrator and the second vibrator so that the cutters can slide against each other. The actuator vibrates the first vibrator and the second vibrator so that the vibrators slide in reciprocation toward opposite directions to each other. Even though vibration of the first vibrator is interrupted by external force through the outer cutter, the second vibrator relatively vibrates so as to slide in reciprocation with respect to the first vibrator and therefore it is easy to meet specified shaving performance.

## Claims

### Claim 1

An electric razor wherein
a linear actuator with a first vibrator and a second vibrator; and
first and second outer cutters and first and second inner cutters that are respectively supported at the first vibrator and the second vibrator so that the cutters can slide against each other,
wherein the actuator vibrates the first vibrator and the second vibrator so that the vibrators slide in reciprocation in opposite directions to each other,
wherein the linear actuator comprises:
a stator that is constructed as an electromagnet and supported inside a body of the electric razor;
a first mover as the first vibrator, the mover having a first permanent magnet arranged opposite the electromagnet, the mover being resiliently supported at the stator; and
a second mover as the second vibrator, the second mover having a second permanent magnet that has the opposite pole of the first permanent magnet and is arranged opposite the electromagnet, the second mover being resiliently supported at the stator;
wherein the linear actuator vibrates the first mover and the second mover so that the movers slide in reciprocation toward opposite directions to each other when the electromagnet is excited, and
the first outer cutter and the first inner cutter are respectively supported at the first mover and the second mover so that the cutters can slide against each other; and
the second outer cutter and the second inner cutter are respectively supported at the second mover and the first mover so that the cutters can slide against each other.

### Claim 2 (depends on 1)

The electric razor of claim 1, wherein the first mover and the second mover slide in reciprocation in opposite directions to each other so as to absorb vibration in direction of the reciprocation.

### Claim 3 (depends on 1)

The electric razor of claim 1, wherein the linear actuator is resiliently supported inside the body of the electric razor so that the actuator can freely vibrate in a direction of the reciprocation.