Blade set for hair cutting appliance and method for its manufacture

Patent metadata

Field	Value
Publication number	US-9873203-B2
Application number	US-201314387862-A
Country	US
Kind code	B2
Filing date	Mar 26, 2013
Priority date	Apr 3, 2012
Publication date	Jan 23, 2018
Grant date	Jan 23, 2018

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 method of manufacturing a stationary blade of an electrically operated hair cutting appliance, the method comprising acts of:
providing a first metal wall with a first laterally extending leading edge, and having a first surface and a second surface;
providing a second metal wall having a second laterally extending leading edge, and having a further first surface and a further second surface;
providing a metal strip having a lateral dimension that corresponds to that of the first and second laterally extending leading edges of the first and second metal wall;
forming a stacked arrangement by stacking the second metal wall on top of the first metal wall, wherein the first surface and the further first surface face each other, at least at the first and second laterally extending leading edges, and arranging the metal strip in between the first and second laterally extending leading edges, such that a longitudinal cross-section of the stacked arrangement of the stationary blade is generally U-shaped;
fixing the stacked arrangement by fixing the metal strip between the first and second laterally extending leading edges to mutually connect the first and second laterally extending leading edges; and
creating generally U-shaped teeth by forming a plurality of laterally spaced apart slots into a leading edge of the stacked arrangement, such that said slots extend longitudinally beyond the metal strip,
wherein the first surface of the first metal wall and the further first surface of the second metal wall in the stacked arrangement define a guide slot for insertion of a movable blade of said blade set between the first surface and the further first surface, and
wherein the first laterally extending leading edge has an average thickness that is less than an average thickness of the second laterally extending leading edge.

2. The method of claim 1 , wherein a longitudinal dimension of the metal strip is smaller than that of the first and second metal walls.

3. The method of claim 1 , wherein the act of fixing the stacked arrangement by fixing the metal strip between the first and second laterally extending leading edges includes welding the metal strip between the first and second laterally extending leading edges.

4. The method of claim 1 , wherein the act of creating generally U-shaped teeth by forming the plurality of laterally spaced apart slots into the leading edge of the stacked arrangement includes machining the plurality of laterally spaced apart slots into the leading edge of the stacked arrangement.

5. The method of claim 1 , wherein a longitudinal dimension of the metal strip is smaller than that of the first and second metal walls, wherein the act of fixing the stacked arrangement by fixing the metal strip between the first and second laterally extending leading edges includes welding the metal strip between the first and second laterally extending leading edges, and wherein the act of creating generally U-shaped teeth by forming the plurality of laterally spaced apart slots into the leading edge of the stacked arrangement includes machining the plurality of laterally spaced apart slots into the leading edge of the stacked arrangement.

Assignees

• Koninklijke Philips Nv

Inventors

• Stapelbroek Martinus Bernardus
• Van Dalen Jan

Classifications

• B26B19/143

  Details of outer cutters · CPC title

• B26B19/3846

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

• B26B19/06 Primary

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

• B26B19/3893

  Manufacturing of shavers or clippers or components thereof · CPC title

• B26B19/384

  Dry-shaver foils; Manufacture thereof · CPC title