# US 2022/0274271 A1 · Attachment comb, cutting head and hair cutting appliance

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 2022/0274271 A1
- Document ID: US20220274271A1
- Status: Published application
- Kind: A1
- Application number: 17/747,007
- Filed: 2022-05-18
- Published: 2022-09-01
- Earliest claimed: 2017-04-14
- Assignees: Koninklijke Philips N.V.
- Applicants: Koninklijke Philips N.V.
- Inventors: Luca IACCARINO
- Web page: https://patentgrep.com/patent/US20220274271A1

## CPC

- B26B 19/20: with provision for shearing hair of preselected or variable length
- B26B 19/063: {Movable or adjustable cutting head}
- B26B 19/386: {Means for attaching the head thereto}
- 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 attachment comb, particularly a skin protecting comb, for a blade set of a cutting head of a hair cutting appliance, the attachment comb including a supporting frame and comb teeth that are arranged in a series and that define a skin contact zone at a top side thereof. The teeth extend from the supporting frame and include rounded tips at frontal ends thereof. Additionally, the teeth are non-uniform along the series and include two outer lateral teeth that define lateral ends of the series, along with central teeth arranged therebetween. At the lateral teeth, a lateral teeth tip radius (Rtl) is present that is greater than a tip radius (Rtc) of the central teeth. Also described herein is corresponding a cutting head and hair cutting appliance.

## Claims

### Claim 1

An attachment comb, particularly a skin protecting comb, for a blade set of a cutting head of a hair cutting appliance, the attachment comb comprising:
a supporting frame; and
a plurality of comb teeth that are arranged in a series and that define a skin contact zone at a top side thereof,
wherein:
the plurality of comb teeth extend from the supporting frame and comprise rounded tips at frontal ends thereof,
the plurality of comb teeth are non-uniform along the series and comprise two outer lateral teeth that define lateral ends of the series having rounded lateral tooth tips, and central teeth having rounded central teeth tips arranged therebetween,
the lateral teeth comprise a lateral teeth tip radius (Rtl) corresponding to a curvature of the rounded lateral tooth tips when the lateral teeth are viewed in a side view perpendicular to the extension direction of the series of teeth,
the central teeth comprise a central teeth tip radius (Rtc) corresponding to a curvature of the rounded central tooth tips when the central teeth are viewed in a side view perpendicular to the extension direction of the series of teeth, and
at the lateral teeth, the lateral teeth tip radius (Rtl) is greater than the central teeth radius (Rtc), and
the plurality of teeth further comprise a rear side facing the blade set in the mounted state, and a front side that is opposite to the rear side, wherein the top side where the skin contact zone is formed connects the front side and the rear side, wherein the rounded tips of the plurality of comb teeth are formed at a transition between the front side and the top side, wherein the rounded tips are convex, and wherein at the front side a concave curvature adjoins the rounded tips.

### Claim 2 (depends on 1)

The attachment comb as claimed in claim 1, wherein at the central teeth a uniform central teeth tip radius (Rtc) is present that is, seen in side view, smaller than the lateral teeth tip radius (Rtl).

### Claim 3 (depends on 1)

The attachment comb as claimed in claim 1, wherein the lateral teeth tip radius (Rtl) is in a range of 1.0 mm to 2.5 mm, optionally in a range of 1.5 mm to 1.8 mm, and wherein the central teeth tip radius (Rtc) is in a range of 0.25 mm to 0.8 mm, optionally in a range of 0.35 mm to 0.7 mm.

### Claim 4 (depends on 1)

The attachment comb as claimed in claim 1, wherein in a vertical direction, the lateral teeth protrude beyond the central teeth towards the top side, and wherein the lateral teeth tips are upwardly offset with respect to the central teeth tips.

### Claim 5 (depends on 1)

The attachment comb as claimed in claim 1, wherein in a longitudinal direction, the lateral teeth protrude beyond the central teeth, wherein the lateral teeth tips are forwardly offset with respect to the central teeth tips.

### Claim 6 (depends on 1)

The attachment comb as claimed in claim 1, wherein a longitudinal extension of the lateral teeth is greater than or equal to a longitudinal extension of the central teeth, wherein the longitudinal extension of the lateral teeth is preferably 0.1 mm to 0.3 mm greater than the longitudinal extension of the central teeth, optionally 0.1 mm to 1.5 mm greater than the longitudinal extension of the central teeth.

### Claim 7 (depends on 1)

The attachment comb as claimed in claim 1, wherein a width of the lateral teeth is greater than a width of the central teeth, wherein a ratio between the width of the lateral teeth and the width of the central teeth is in a range between greater than 1.0 and 1.5, optionally between 1.25 and 1.5.

### Claim 8 (depends on 1)

The attachment comb as claimed in claim 1, wherein tooth slots are formed between the plurality of comb teeth of the series, wherein the tooth slots have a width of no more than 1.5 mm, optionally no more than 1.2 mm.

### Claim 9 (depends on 1)

The attachment comb as claimed in claim 1, wherein the supporting frame forms opposite lateral walls, wherein lateral lugs extend inwardly from the lateral walls to contact top side lateral end bars of a stationary blade of the blade set, wherein at a bottom side of the attachment comb a linking bar extends between the lateral walls, and wherein the plurality of comb teeth extend substantially in a vertical direction from the linking bar.

### Claim 10 (depends on 9)

The attachment comb as claimed in claim 9, wherein the lateral walls and the lateral teeth form snap-on mounting features that cooperate for releasably attaching the attachment comb to the blade set.

### Claim 11 (depends on 1)

The attachment comb as claimed in claim 1, wherein the attachment comb is operable in a minimized offset configuration, wherein, in the mounted state, the skin contact zone formed at the top side of the attachment comb is upwardly offset from a top surface of the stationary blade of the blade set, by an offset value in a range of greater than 0.0 mm to 0.2 mm, optionally by an offset value of 0.05 mm to 0.2 mm.

### Claim 12 (depends on 1)

The attachment comb as claimed in claim 1, comprising a first series of comb teeth and a second series of comb teeth that is opposite to the first series of comb teeth, wherein the first series of comb teeth and the second series of comb teeth define therebetween a recess for the blade set of the hair cutting appliance.

### Claim 13 (depends on 1)

A cutting head for a hair cutting appliance, the cutting head comprising:
a blade set comprising a stationary blade and a movable blade, the stationary blade and the movable blade comprising at least one toothed leading edge jointly defined by respective teeth of the stationary blade and the movable blade, the teeth of the stationary blade and the movable blade basically extending in a longitudinal direction, wherein the stationary blade further comprises a top surface at the teeth thereof, the top surface being arranged to face a user's skin when in operation, and
an attachment comb as claimed in claim 1, wherein the attachment comb is releasably mounted to the blade set.

### Claim 14 (depends on 13)

The cutting head as claimed in claim 13, further comprising a swiveling mechanism that couples the blade set and a housing portion, wherein the attachment comb is arranged, in a mounted state, to be pivoted together with the blade set with respect to the housing portion.