# US 11,897,151 B2 · Electric beard trimmer

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- Number: US 11,897,151 B2
- Document ID: US11897151B2
- Status: Granted
- Kind: B2
- Application number: 17/157,879
- Filed: 2021-01-25
- Published: 2021-07-29
- Granted: 2024-02-13
- Earliest claimed: 2020-01-23
- Assignees: Braun GmbH
- Applicants: Braun GmbH
- Inventors: Alois Koeppl; Reinhold Eichhorn; Jana Schmitt; Martin Fuellgrabe
- Web page: https://patentgrep.com/patent/US11897151B2

## CPC

- B26B 19/3846: {Blades; Cutters (B26B19/044, B26B19/141 take precedence)}
- B26B 19/042: {Long hair cutters or older types comprising a cutting grid}
- B26B 19/046: {Cutters being movable in the cutting head}
- B26B 19/10: involving two or more different types of reciprocating cutting elements, e.g. a pair of toothed shearing elements combined with a pair of perforated cutting elements or a combined toothed and perforated cutting assembly
- B26B 19/205: {by adjustment of the cutting members}
- B26B 19/3893: {Manufacturing of shavers or clippers or components thereof}
- B26B 19/06: involving co-operating cutting elements both of which have shearing teeth
- 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 a cutter system for an electric shaver and/or trimmer, comprising a pair of comb-like cutting elements with cooperating toothed cutting edges and movably supported relative to each other by a support element, wherein lateral ends of at least one of the cutting elements are provided with lateral protection elements having rounded and/or chamfered edge contours for soft skin engagement, wherein the lateral protection element is enveloping and covering a gap movably receiving the other cutting element and/or enveloping the support element.

## Claims

### Claim 1

A cutter system for an electric shaver and/or trimmer, comprising a pair of cooperating cutting elements supported relative to each other by a support element, wherein each of lateral ends of at least one of said cutting elements are provided with at least a part of a lateral protection element having rounded and chamfered edge contours for soft skin engagement, said cooperating cutting elements comprising a first stationary cutting element having a side facing a second moveable cutting element and an opposing side defining a skin contact surface, said second moveable cutting element being moveable in a movement direction, said pair of cooperating cutting elements having lateral sides perpendicular to said movement direction and longitudinal sides parallel to said movement direction, wherein said lateral protection elements are protruding only in a direction away from the skin contact surface of the opposing side of said first stationary cutting element, wherein the lateral protection elements do not cross or extend above a plane containing the skin contact surface of the opposing side of said first stationary cutting element, each of the lateral protection elements enveloping or covering a gap movably receiving said second moveable cutting element at said lateral sides and enveloping or covering the support element.

### Claim 2 (depends on 1)

The cutter system according to claim 1, wherein an outer contour of each of said lateral protection elements, when viewed in a direction perpendicular to said skin contact surface of the opposing side of said first stationary cutting element, is L- or U-shaped with a first protective portion extending at a toothed cutting edge of said first stationary cutting element, a second protective portion extending along said lateral end and a rounded corner protective portion connecting said first and second protective portions, wherein each of said first, second and corner protective portions is bent or curved away from said skin contact surface.

### Claim 3 (depends on 1)

The cutter system according to claim 1, wherein each of said lateral protection elements is provided as an extension of said support structure.

### Claim 4 (depends on 1)

The cutter system according to claim 1, wherein each of said lateral protection elements is formed in part by said first stationary cutting element and in part by the support element which projects at least laterally beyond said first stationary cutting element, wherein said support element and said first stationary cutting element together define a rounded and chamfered contour for lateral soft skin engagement.

### Claim 5 (depends on 4)

The cutter system according to claim 4, wherein a space between said support element and said first stationary cutting element which said space receives said second moveable cutting element, is filled by a filler material which forms a part of said rounded and chamfered contour.

### Claim 6 (depends on 1)

The cutter system according to claim 1, wherein said first stationary cutting element comprises first thickened or rounded tooth tips overhanging extending beyond the tooth tips of the second moveable cutting element, wherein said first tooth tips are provided with a two-step rounding including a spherical or drop-shaped or pearl-shaped thickening and a bend tooth portion connecting said thickening to a main tooth portion and bent away from the skin contact surface of said main tooth portion.

### Claim 7 (depends on 6)

The cutter system according to claim 6, wherein
said bend tooth portion has a bending radius smaller than 400 μm, and
said thickening has a diameter ranging from 300-550 μm, and
an overhanging length defining the length of the protrusion of the first tooth tips extending beyond the tooth tips of the second moveable cutting element ranging from 400-800 μm.

### Claim 8 (depends on 1)

The cutter system according to claim 1, wherein said first stationary cutting element comprises cutting teeth, at a main tooth portion providing for cutting action, have a tooth width ranging from 250-550 μm and a thickness ranging from 50-150 μm, wherein the cutting teeth have a tooth height including the rounded, thickened tooth tips ranging from 300-550 μm and define a gap between neighboring cutting teeth, having a gap width ranging from 200-500 μm.

### Claim 9 (depends on 1)

The cutter system according to claim 1, wherein said first stationary cutting element comprises cutting teeth of different rows of cooperating cutting teeth having skin contact surfaces which are coplanar to each other and to an upper surface of the lateral protection elements.

### Claim 10 (depends on 1)

The cutter system according to claim 1, wherein the second moveable cutting element is sandwiched between the first stationary cutting element and said support element, wherein at least one spacer defines the gap in which the second moveable cutting element is movably received, said spacer and thus said gap having a thickness larger than the thickness of the second moveable cutting element by an amount smaller than the diameter of hair to be cut, wherein said support element, said spacer and the first stationary cutting element form a rigid sandwiching frame having a gap in which the second moveable cutting element is slidably received.

### Claim 11 (depends on 1)

A method of manufacturing the cutter system of claim 1, wherein each of the lateral protection elements are formed by bending lateral end portions of the first stationary cutting element away from the skin contact surface such that the bent portions form a rounded and/or chamfered contour enveloping and covering up a gap movably receiving the second moveable cutting element and enveloping and covering up the support element at the lateral sides of the cutter system.

### Claim 12 (depends on 11)

The method according to claim 11, wherein the first stationary cutting element comprises cutting teeth and the lateral protection elements are formed by bending of the lateral edge portions of the first stationary cutting element into the same bending direction and in one bending step and using the same bending tool and holding the first stationary cutting element in the same holding tool.

### Claim 13 (depends on 11)

The method according to claim 11, wherein the lateral end portions of the first stationary cutting element to be bent to form the lateral protection elements are thinned before bending by means of removing material from the first stationary cutting element to form a notch.