# US 11,077,568 B2 · Electric shaver

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- Number: US 11,077,568 B2
- Document ID: US11077568B2
- Status: Granted
- Kind: B2
- Application number: 15/718,339
- Filed: 2017-09-28
- Published: 2018-03-29
- Granted: 2021-08-03
- Earliest claimed: 2016-09-28
- Assignees: Braun GmbH
- Applicants: Braun GmbH
- Inventors: Joachim Krauss; Cirilo Javier Perez Lopez; Uwe Ludaescher; Sebastian Hottenrott
- Web page: https://patentgrep.com/patent/US11077568B2

## CPC

- B26B 19/386: {Means for attaching the head thereto}
- B26B 19/046: {Cutters being movable in the cutting head}
- B26B 19/048: {Complete cutting head being movable}
- B26B 19/063: {Movable or adjustable cutting head}
- B26B 19/146: {Complete cutting head being movable}
- B26B 19/3826: {Separate accessories}
- B26B 19/388: {Sensors; Control}
- B26B 19/3893: {Manufacturing of shavers or clippers or components thereof}
- B26B 19/042: {Long hair cutters or older types comprising a cutting grid}
- B26B 19/282: {Motors without a rotating central drive shaft, e.g. linear motors}
- B26B 19/40: Lubricating
- 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

The present invention relates to electric shavers, handpieces of such shavers and a method of manufacturing such electric shavers. More particularly, the present invention relates to a shaver set comprising a plurality of electric shavers.

## Claims

### Claim 1

A shaver set comprising:
a plurality of electric shavers, each shaver comprising:
a handle comprising a housing,
a motor received in said housing,
a shaver head connected to said handle by a support structure mounted to connector elements of said housing,
at least one cutter unit provided on said shaver head and including a cutter element and a shearfoil, wherein said cutter element is configured to be driven along a cutter oscillation axis by said motor via a drive transmitter extending from said housing, past the connector elements of said housing and into the support structure connecting said motor to said cutter element,
wherein the housings of all electric shavers including the drive transmitters supported by said housings and the connector elements of said housings are identical to each other, wherein the identical structure of the connector elements of all housings matches with the support structure of each shaver head,
wherein
the shaver heads and the support structure thereof are different from each other, wherein the following three types of support structures are included:
a first support structure configured to provide for a swivel axis and a tilting axis about which a corresponding said shaver head may swivel and tilt relative to said associated handle, a second support structure configured to provide for only a swivel axis about which a corresponding said shaver head may swivel relative to said associated handle, and
a third support structure configured to rigidly hold a corresponding said shaver head relative to said associated handle.

### Claim 2 (depends on 1)

The shaver set according to claim 1, wherein each of said first, second and third support structures include a pair of link arms connected to the connector elements of the housing of the associated handle, said connector elements forming joints providing for pivot axes extending transverse to the longitudinal axis of the handle, wherein
the link arms of said first support structure are pivotably connected to a shaver head frame by head joints providing for pivot axes extending substantially parallel to the pivot axes provided by the connector elements of the housing, thus forming a four-joint linkage for tiltably supporting said head frame about said tilting axis, wherein said shaver head frame pivotably supports a cutter support frame about said swivel axis, said cutter support frame supporting the at least one cutter unit,
the link arms of said second support structure are rigidly connected to a shaver head frame, said shaver head frame pivotably supporting a cutter support frame about said swivel axis, said cutter support frame supporting said at least one cutter unit, and
the link arms of said third support structure are rigidly connected to a shaver head frame to which a cutter support frame is rigidly connected, said cutter support frame supporting said at least one cutter unit.

### Claim 3 (depends on 2)

The shaver set according to claim 2, wherein said link arms are mounted in a standing configuration with connection points of the link arms being connected with the shaver head so as to be further away from the handle than connection points of the link arms which are connected with the handle, wherein said link arms are uncovered and freely accessible between the handle and the shaver head with said link arms being visible to a user.

### Claim 4 (depends on 1)

The shaver set according to claim 1, wherein the shaver head of each of the electric shavers is positioned spaced apart from the associated handle with a gap defined between a bottom face of the shaver head and a top face of the handle, said gap forming a peripheral contraction in the outer contour of the shaver around the support structure and giving access to the support structure bridging the gap, wherein said gap, at its smallest section, has a width of more than about 3 mm, said width corresponding to the distance of the bottom face of the shaver head from the top face of the handle.

### Claim 5 (depends on 1)

The shaver set according to claim 1, wherein, in each of said shavers, the drive transmitter includes a shaft having a shaft portion extending out of the housing and supporting a crank element to which at least one drive pin is rigidly connected, wherein said shaft, said crank element and said drive pin form a rigid structure with the drive pin defining a longitudinal axis holding a fixed orientation relative to the handle, and wherein, in each shaver head, the cutter element of the at least one cutter unit includes a drive pin recess in which the drive pin is received fixedly in the direction of the cutter oscillation axis.

### Claim 6

A method of manufacturing a shaver set comprising a plurality of electric shavers, each shaver comprising a handle having a housing, a shaver head including at least one cutter unit comprising a shearfoil and a cutter element drivable under said shearfoil along a cutter oscillation axis, and a motor connected to said cutter element via a drive transmitter, the method comprising:
a) manufacturing, for each of said electric shavers, a corresponding said housing for containing the motor and supporting the drive transmitter, the drive transmitter extending from said housing, past connector elements of said housing and into a support structure for a corresponding said shaver head, a portion of said housings containing and fully enveloping the motor and supporting the drive transmitter, being identical to each other and having the connector elements for connecting the support structure of each of the shaver heads to said housing, with all housings of all shavers of the shaver set having the identical structure of connector elements,
b) manufacturing, for each of the electric shavers, a support structure for connecting the shaver head to said housing,
wherein said support structures include the following three support structures:
a first support structure configured to provide for a swivel axis and a tilting axis about which said corresponding shaver head may swivel and tilt relative to said associated housing,
a second support structure configured to provide for a swivel axis about which said corresponding shaver head may swivel relative to said associated handle, and
a third support structure configured to rigidly hold the corresponding shaver head non-moveable relative to the associated housing,
wherein the support structures of all shaver heads are manufactured to match the connector elements of all housings of all electric shavers of the shaver set.

### Claim 7 (depends on 6)

The method according to claim 6, wherein said housing includes an inner housing portion for receiving said motor and an outer housing portion surrounding said inner housing portion.

### Claim 8

A shaver handpiece of an electric shaver, wherein said shaver handpiece comprising a handle having a housing, a motor received in said housing, a drive transmitter connected to said motor and including a drive shaft having a shaft portion extending outside of said housing, said shaft is driven by said motor to rotate in a reciprocating manner, wherein said housing is provided with connector elements for connecting a shaver head to the handle, wherein
said housing comprises an inner housing portion receiving said motor and an outer housing portion surrounding said inner housing portion, the outer housing portion comprising shell elements positioned on opposite sides of the inner housing portion, wherein said connector elements for connecting the shaver head are provided on said inner housing portion and include joints providing for a pair of pivot axes extending transverse to the longitudinal axis of the drive shaft and positioned on opposite sides of the drive shaft, wherein said joints are positioned in place at said inner housing portion.

### Claim 9 (depends on 8)

The shaver handpiece according to claim 8, wherein said handle has an elongated shape the cross-section of which continuously increases from a bottom portion toward a top portion opposite to said bottom portion.

### Claim 10 (depends on 8)

The shaver handpiece according to claim 8, wherein said drive transmitter further includes a crank element rigidly connected to said shaft and at least one drive pin rigidly connected to said crank element and defining a longitudinal drive pin axis having a fixed orientation relative to the handle, wherein said crank element and said drive pin are positioned outside the inner housing portion and the outer housing portion.

### Claim 11 (depends on 8)

The shaver handpiece according to claim 8, wherein said outer housing portion includes a ring element surrounding said shaft and having an inner diameter which is smaller than a maximum diameter of the inner housing portion, said ring element being positioned at an end portion of the handle where the shaft penetrates the inner housing portion, said outer housing portion shell elements to be connected to each other, wherein at least one of said shell elements is to be connected to said ring element.

### Claim 12 (depends on 8)

The shaver handpiece according to claim 8, wherein said inner housing portion is only provided with a first opening for the shaft of the drive.

### Claim 13 (depends on 8)

The shaver handpiece according to claim 8, wherein said inner housing portion is provided with at least one soft material portion which is associated with a switching element arranged inside said inner housing portion.