# US 11,298,841 B2 · Hair cutting system and attachment

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- Number: US 11,298,841 B2
- Document ID: US11298841B2
- Status: Granted
- Kind: B2
- Application number: 16/614,828
- Filed: 2018-06-05
- Published: 2020-03-19
- Granted: 2022-04-12
- Earliest claimed: 2017-06-14
- Assignees: Koninklijke Philips N.V.
- Applicants: Koninklijke Philips N.V.
- Inventors: Rogier Enrico De Haas; Geert Willem De Goeij; Joost Tomas Glazenburg; Anke Gerda Sinnema
- Web page: https://patentgrep.com/patent/US11298841B2

## CPC

- B26B 19/3813: {Attachments}
- B26B 19/06: involving co-operating cutting elements both of which have shearing teeth
- B26B 19/20: with provision for shearing hair of preselected or variable length
- 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

There is disclosed an attachment (22) for a cutting head (100) of a hair cutting device (1). The attachment (22) comprises first and second side portions (24, 26) configured to cover, respectively, first and second sides (112, 114) of a stationary cutting member (115) of the cutting head (100), and an intermediate portion (28) interconnecting the first and second side portions (24, 26) and configured to cover an outer surface (120b) of a first wall portion (120) of the stationary cutting member (115). The first and second side portions (24, 26) are configured to protrude relative to the plurality of primary cutter teeth (118) of the stationary cutting member (115), which define a cutting zone of the cutting head. The first and second side portions (24, 26) and the intermediate portion (28) define a recess exposing the primary cutter teeth (118) of the stationary cutting member (115). The recess is non-interrupted over a distance of at least 50% of the length of the cutting zone.

## Claims

### Claim 1

A hair cutting system comprising a cutting head and an attachment which is releasably connectable to the cutting head,
the cutting head comprising:
a stationary cutting member comprising a first wall portion, a second wall portion, and a bent intermediate wall portion connecting the first and second wall portions, wherein a plurality of primary cutter teeth each having a bent cross-section is provided on the bent intermediate wall portion; and
a movable cutting member moveable in a reciprocating manner along a cutter axis in a guiding space enclosed by the first and second wall portions of the stationary cutting member, wherein the movable cutting member comprises a plurality of secondary cutter teeth for co-operation with the primary cutter teeth,
wherein the first wall portion and the second wall portion each have an inner surface and an outer surface, wherein the inner surfaces of the first and second wall portions face each other, and wherein the outer surface of the first wall portion is part of a skin facing surface of the cutting head which faces a user's skin during operation,
wherein the plurality of primary cutter teeth define a cutting zone of the cutting head extending parallel to the cutter axis and having a length, and
wherein the stationary cutting member further comprises first and second sides spaced apart in a direction parallel to the cutter axis; and
the attachment comprising:
first and second side portions configured to cover, respectively, the first and second sides of the stationary cutting member when the attachment is connected to the cutting head; and
an intermediate portion interconnecting the first and second side portions of the attachment and configured to cover the outer surface of the first wall portion of the stationary cutting member when the attachment is connected to the cutting head,
wherein, when the attachment is connected to the cutting head:
the first and second side portions of the attachment protrude relative to the primary cutter teeth in a direction perpendicular to the cutter axis and parallel to the first wall portion; and
the first and second side portions of the attachment and the intermediate portion define opposite recesses respectively exposing the primary cutter teeth, each recess extending in the direction parallel to the cutter axis and being non-interrupted in the direction parallel to the cutter axis over a distance of at least 50% of the length of the cutting zone,
wherein the first and second side portions of the attachment each has a convex outer surface, seen in a cross-section parallel to the first wall portion of the stationary cutting member, extending outwardly from the intermediate portion past the first and second sides of the stationary cutting member in opposite directions parallel to the cutter axis when the attachment is connected to the cutting head, and
wherein each recess is bounded by a continuous longitudinal edge of the intermediate portion which, when the attachment is on the first wall portion of the stationary cutting member, extends in the direction parallel to the cuter axis.

### Claim 2 (depends on 1)

The hair cutting system according to claim 1, wherein each recess is non-interrupted over a distance of at least 90% of the length of the cutting zone.

### Claim 3 (depends on 1)

The hair cutting system according to claim 1, wherein the intermediate portion comprises an elongate wall which, when the attachment is connected to the cutting head, extends in the direction parallel to the cutter axis and has a convex outer surface seen in a cross-section perpendicular to the cutter axis.

### Claim 4 (depends on 3)

The hair cutting system according to claim 3, wherein the convex outer surface of the elongate wall has a radius of curvature of between 10 mm and 50 mm in said cross-section perpendicular to the cutter axis.

### Claim 5 (depends on 1)

The hair cutting system according to claim 1, wherein, when the attachment is connected to the cutting head, the first and second side portions protrude relative to the primary cutter teeth in the direction perpendicular to the cutter axis and parallel to the first wall portion by a distance of between 0.5 mm and 3 mm.

### Claim 6 (depends on 1)

The hair cutting system according to claim 1, wherein the convex outer surfaces of the first and second side portions each have a radius of curvature in the cross-section parallel to the first wall portion which is between 0.5 and 2 times a length of the respective side portion in the direction perpendicular to the cutter axis and parallel to the first wall portion.

### Claim 7 (depends on 1)

The hair cutting system according to claim 1, wherein the first and second side portions of the attachment each has the convex outer surface, seen in a cross-section perpendicular to the first wall portion and a cross-section parallel to the cutter axis.

### Claim 8 (depends on 7)

The hair cutting system according to claim 7, wherein the convex outer surfaces of the first and second side portions each has a radius of curvature in said cross-section perpendicular to the first wall portion and said cross-section parallel to the cutter axis which is between 1 mm and 5 mm.

### Claim 9 (depends on 1)

The hair cutting system according to claim 1, wherein the attachment is connectable to the cutting head by means of a releasable snap-on connector.

### Claim 10 (depends on 1)

The hair cutting system according to claim 1, wherein the attachment is toothless.

### Claim 11 (depends on 1)

The hair cutting system according to claim 1, wherein the attachment further comprises:
a releasable snap-on connector comprising elastically deformable edge portions formed on the first and second side portions of the attachment and configured to clamp around the first and second sides of the stationary cutting member.

### Claim 12

A hair cutting system comprising a cutting head and an attachment which is releasably connectable to the cutting head,
the cutting head comprising:
a stationary cutting member comprising:
a first wall portion, a second wall portion, and a bent intermediate wall portion connecting the first and second wall portions, wherein a plurality of primary cutter teeth each having a bent cross-section is provided on the bent intermediate wall portion;
a third wall portion, a fourth wall portion, and a bent further intermediate wall portion connecting the third and fourth wall portions, wherein a plurality of further primary cutter teeth each having a bent cross-section is provided on the bent further intermediate wall portion; and
first and second sides spaced apart in a direction parallel to a cutter axis, and opposite third and fourth sides spaced apart in a direction perpendicular to the cutter axis, wherein the plurality of primary cutter teeth and the plurality of further primary cutter teeth are respectively provided on the opposite third and fourth sides;
a movable cutting member moveable in a reciprocating manner along the cutter axis in a guiding space enclosed by the first and second wall portions and the third and fourth wall portions, wherein the movable cutting member comprises a plurality of secondary cutter teeth for co-operation with the primary cutter teeth and a plurality of further secondary cutter teeth for co-operation with the further primary cutter teeth,
wherein the first wall portion and the second wall portion each has an inner surface and an outer surface, wherein the inner surfaces of the first and second wall portions face each other, and wherein the outer surface of the first wall portion is part of a skin facing surface of the cutting head which faces a user's skin during operation,
wherein the third wall portion and the fourth wall portion each has an inner surface and an outer surface, wherein the inner surfaces of the third and fourth wall portions face each other, and wherein the outer surface of the third wall portion is part of the skin facing surface of the cutting heads,
wherein the plurality of primary cutter teeth define a cutting zone of the cutting head extending parallel to the cutter axis and having a length,
wherein the plurality of further primary cutter teeth define a further cutting zone of the cutting head extending parallel to the cutter axis and having a further length; and
the attachment comprising:
first and second side portions configured to cover, respectively, the first and second sides of the stationary cutting member when the attachment is connected to the cutting head; and
an intermediate portion interconnecting the first and second side portions of the attachment, and is configured to cover the outer surface of each of the first wall portion and the third wall portion of the stationary cutting member when the attachment is connected to the cutting head; and
wherein, when the attachment is connected to the cutting head:
the first and second side portions of the attachment protrude relative to the primary cutter teeth and the further primary cutter teeth in the direction perpendicular to the cutter axis and parallel to the first wall portion and the third wall portion of the stationary cutting member; and
the first and second side portions of the attachment and the intermediate portion of the attachment define a recess exposing the primary cutter teeth and a further recess exposing the further primary cutter teeth, each of the recess and the further recess extending in the direction parallel to the cutter axis and being non-interrupted in the direction parallel to the cutter axis over a distance of at least 50% of the length of the cutting zone and the further cutting zone respectively, and
wherein the first and second side portions of the attachment each has a convex outer surface, seen in a cross-section parallel to the first wall portion of the stationary cutting member when the attachment is connected to the cutting head, and wherein each of the recess and the further recess is bounded by a continuous longitudinal edge of the intermediate portion which, when the attachment is on the first and third wall portions of the stationary cutting member, extends in the direction parallel to the cuter axis.

### Claim 13 (depends on 12)

The hair cutting system according to claim 12, wherein, when the attachment is connected to the cutting head, the first and second side portions of the attachment protrude relative to the primary cutter teeth by a first distance and protrude relative to the further primary cutter teeth by a second distance different from the first distance.

### Claim 14

A system including an attachment releasably connected to a cutting head of a hair cutting device, the cutting head comprising:
a stationary cutting member comprising a first wall portion, a second wall portion, and a bent intermediate wall portion connecting the first and second wall portions, wherein a plurality of primary cutter teeth each having a bent cross-section is provided on the bent intermediate wall portion; and
a movable cutting member moveable in a reciprocating manner along a cutter axis in a guiding space enclosed by the first and second wall portions of the stationary cutting member, wherein the movable cutting member comprises a plurality of secondary cutter teeth for co-operation with the primary cutter teeth,
wherein the first wall portion and the second wall portion each has an inner surface and an outer surface, wherein the inner surfaces of the first and second wall portions face each other, and wherein the outer surface of the first wall portion is part of a skin facing surface of the cutting head which faces a user's skin during operation,
wherein the plurality of primary cutter teeth define a cutting zone of the cutting head extending parallel to the cutter axis and having a lengths, and
wherein the stationary cutting member has opposite first and second sides spaced apart in a direction parallel to the cutter axis; and
the attachment comprising:
first and second side portions configured to cover, respectively, the first and second sides of the stationary cutting member; and
an intermediate portion interconnecting the first and second side portions of the attachment and configured to cover the outer surface of the first wall portion of the stationary cutting member; and
wherein the first and second side portions of the attachment protrude relative to the primary cutter teeth in a direction perpendicular to the cutter axis and parallel to the first wall portion, and
wherein the first and second side portions of the attachment and the intermediate portion define opposite recesses respectively exposing the primary cutter teeth, each recess extending in the direction parallel to the cutter axis and being non-interrupted in the direction parallel to the cutter axis over a distance of at least 50% of the length of the cutting zone,
wherein the first and second side portions of the attachment each has a convex outer surface, seen in a cross-section parallel to the first wall portion of the stationary cutting member and parallel to the cutter axis, extending outwardly from the intermediate portion past the first and second sides of the stationary cutting member in opposite directions parallel to the cutter axis, and
wherein each recess is bounded by a continuous longitudinal edge of the intermediate portion which, when the attachment is on the first wall portion of the stationary cutting member, extends in the direction parallel to the cuter axis.

### Claim 15 (depends on 14)

The system according to claim 14, further comprising:
a releasable snap-on connector comprising elastically deformable edge portions formed on the first and second side portions of the attachment and configured to clamp around the first and second sides of the stationary cutting member.

### Claim 16 (depends on 14)

The system according to claim 14, wherein the first and second side portions each has the convex outer surface, seen in a cross-section perpendicular to the first wall portion and the cross-section parallel to the cutter axis.

### Claim 17 (depends on 16)

The system according to claim 16, wherein the convex outer surfaces of the first and second side portions each has a radius of curvature in the cross-section perpendicular to the first wall portion and the cross-section parallel to the cutter axis which is between 1 mm and 5 mm.