Blade set for hair cutting appliance and method for its manufacture

Patent metadata

Field	Value
Publication number	US-10300618-B2
Application number	US-201715848731-A
Country	US
Kind code	B2
Filing date	Dec 20, 2017
Priority date	Apr 3, 2012
Publication date	May 28, 2019
Grant date	May 28, 2019

Abstract

A stationary blade for a blade set of an electrically operated hair cutting appliance includes first and second walls, where each wall has a first surface, a second surface facing away from the first surface, and a laterally extending leading edge having a plurality of laterally spaced apart longitudinally extending projections. The first surfaces of the first and second walls face each other, at least at their leading edges, while corresponding projections along the leading edges of the first and second walls are mutually connected at their tips to define a plurality of generally U-shaped teeth. The first surfaces of the first and second walls are separated to define a laterally extending guide slot for insertion of a movable blade of the blade set between them. The projections of the first wall have an average thickness that is less than an average thickness of the projections of the second wall.

First claim

The invention claimed is:

1. A stationary blade for a blade set of an electrically operated hair cutting appliance, comprising:
a first wall and a second wall, each of the first and second walls having a first surface, a second surface facing away from the first surface, and a leading edge with projections,
wherein the first surfaces of the first and second walls face each other, at least at the leading edges,
wherein the projections facing each other along the leading edges of the first and second walls are mutually connected at tips of the projections facing each other to define U-shaped teeth,
wherein the first surfaces of the first and second walls along the leading edges are separated to define a guide slot for insertion of a movable blade of the blade set between the first surfaces of the first and second walls in the guide slot, the guide slot having a U-shaped cross-section with legs defined by the projections of the first and second walls, and
wherein the projections of the first wall forming one of the legs of the U-shaped cross-section have the second surfaces that are configured to contact a skin of a user and have an average thickness that is less than an average thickness of the projections of the second wall.

2. The stationary blade of claim 1 , wherein at least the projections of the first wall have an average thickness less than 200 μm.

3. The stationary blade of claim 1 , wherein the first wall is substantially planar.

4. The stationary blade of claim 1 , wherein the first wall, seen in a cross-sectional plane perpendicular to a lateral direction, is convexly curved.

5. The stationary blade of claim 1 , wherein at least one of the teeth, seen in a cross-sectional plane perpendicular to a lateral direction, has a convexly curved tip.

6. The stationary blade of claim 1 , wherein the first and second walls are mutually connected by at least one discrete connector portion that extends between their respective first surfaces.

7. The stationary blade of claim 1 , wherein an average thickness of the stationary blade, measured between the second surfaces of the first and second walls at their projections, is less than 1 mm.

8. The stationary blade of claim 1 , wherein the first and second walls are at least partially made of sheet metal.

9. A stationary blade for a blade set of an electrically operated hair cutting appliance, comprising:
a first wall and a second wall, each of the first and second walls having a first surface, a second surface facing away from the first surface, and a leading edge with projections,
wherein the first surfaces of the first and second walls face each other, at least at the leading edges,
wherein the projections facing each other along the leading edges of the first and second walls are mutually connected at tips of the projections facing each other to define a plurality of U-shaped teeth,
wherein the first surfaces of the first and second walls are separated to define a guide slot for insertion of a movable blade of the blade set between the first surfaces of the first and second walls in the guide slot,
wherein the projections of the first wall have an average thickness that is less than an average thickness of the projections of the second wall, and
wherein at least one tip of a U-shaped tooth of the stationary blade is provided with a convexly curved, plastic coating.

10. The stationary blade of claim 1 , wherein the guide slot extends linearly, and the projections extend substantially in parallel.

11. A stationary blade for a blade set of an electrically operated hair cutting appliance, comprising:
a first wall and a second wall, each of the first and second walls having a first surface, a second surface facing away from the first surface, and a leading edge with projections,
wherein the first surfaces of the first and second walls face each other, at least at the leading edges,
wherein the projections facing each other along the leading edges of the first and second walls are mutually connected at tips of the projections facing each other to define a plurality of U-shaped teeth,
wherein the first surfaces of the first and second walls are separated to define a guide slot for insertion of a movable blade of the blade set between the first surfaces of the first and second walls in the guide slot,
wherein the projections of the first wall have an average thickness that is less than an average thickness of the projections of the second wall, and
wherein the guide slot extends tangentially around a central axis along a circularly curved path, while the projections extend radially relative to the central axis.

12. A blade set for a hair cutting appliance, comprising:
a stationary blade having a first wall and a second wall, each of the first and second walls having a first surface, a second surface facing away from the first surface, and a leading edge with projections; and
a movable blade having a toothed leading edge,
wherein the first surfaces of the first and second walls face each other, at least at the leading edges,
wherein the projections facing each other along the leading edges of the first and second walls are mutually connected at tips of the projections facing each other to define a plurality of U-shaped teeth,
wherein the first surfaces of the first and second walls along the leading edges are separated to define a guide slot for insertion of the movable blade of the blade set between the first surfaces of the first and second walls in the guide slot, the guide slot having a U-shaped cross-section with legs defined by the projections of the first and second walls,
wherein the projections of the first wall forming one of the legs of the U-shaped cross-section have the second surfaces that are configured to contact a skin of a user and have an average thickness that is less than an average thickness of the projections of the second wall, and
wherein the movable blade is laterally movably arranged within the guide slot defined by the first and second walls of the stationary blade, wherein, upon lateral reciprocation or rotation of the movable blade relative to the stationary blade, the toothed leading edge of the movable blade cooperates with the plurality of U-shaped teeth of the stationary blade to enable cutting of hair caught therebetween in a scissor action.

13. The blade set of claim 12 , wherein at least the projections of the first wall have an average thickness less than 200 μm, and wherein an average thickness of the stationary blade, measured between the second surfaces of the first and second walls at their projections, is less than 1 mm.

14. A blade set for a hair cutting appliance, comprising:
a stationary blade having a first wall and a second wall, each of the first and second walls having a first surface, a second surface facing away from the first surface, and a leading edge with projections; and
a movable blade having a toothed leading edge,
wherein the first surfaces of the first and second walls face each other, at least at the leading edges,
wherein the projections facing each other along the leading edges of the first and second walls are mutually connected at tips of the projections facing each other to define a plurality of U-shaped teeth,
wherein the first surfaces of the first and second walls are separated to define a guide slot for insertion of the movable blade of the blade set between the first surfaces of the first and second walls in the guide slot,
wherein the projections of the first wall have an average thickness that is less than an average thickness of the projections of the second wall, and
wherein the movable blade is

Assignees

• Koninklijke Philips Nv

Inventors

• Stapelbroek Martinus Bernardus
• Van Dalen Jan

Classifications

• B26B19/384

  Dry-shaver foils; Manufacture thereof · CPC title

• B26B19/06 Primary

  involving co-operating cutting elements both of which have shearing teeth · CPC title

• B26B19/143

  Details of outer cutters · CPC title

• B26B19/3846

  Blades; Cutters (B26B19/044, B26B19/141 take precedence) · CPC title

• B26B19/3893

  Manufacturing of shavers or clippers or components thereof · CPC title