US 2016/0101530 A1Published application

Stationary cutting blade for a hair clipping device

AssigneeKoninklijke Philips N.V.

InventorsSIEGFRIED SABLATSCHAN, ROEL ALEXANDER RETHMEIER, WILLEM MAAT

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Abstract

The present invention relates to a stationary cutting blade (12) for a hair clipping device (100) with a base body and a plurality of coined cutting teeth (22) which are spaced apart from each other and arranged on a front side (38) of the base body and each extend parallel to a longitudinal axis (40) of the stationary cutting blade (12). The stationary cutting blade (12) is a full metal cutting blade. A thickness ratio between the thickness of the base body (ti) and the thickness of the cutting teeth (t2) is larger than 1.1. Each of the plurality of cutting teeth (22) has a substantially wedge-shaped cross-section with a scissor angle (a) and a wedge angle (y), wherein a sum of the scissor angle (a) and the wedge angle (y) is smaller than 70°.

Claims15

Dependent claims

A stationary cutting blade for a hair clipping device, comprising:

a base body;
and
a plurality of coined cutting teeth which are spaced apart from each other and arranged on a front side of the base body and each extend parallel to a longitudinal axis of the stationary cutting blade;
wherein the stationary cutting blade is a full metal cutting blade and the base body has a first thickness (t1), said first thickness (t1) being measured between a top side and a bottom side of the base body along a transverse axis perpendicular to the longitudinal axis, wherein the cutting teeth have a second thickness (t2) measured parallel to the transverse axis, wherein a thickness ratio between the first and the second thickness (t1/t2) is larger than 1.1;
wherein each of the plurality of cutting teeth has a substantially wedge-shaped cross-section with a top face, a bottom face and two opposing lateral faces running in between the top and the bottom face;
wherein a cutting edge that is defined at the intersection between the top face and an upper section of one of the lateral faces has a scissor angle (α), which is defined between the cutting edge and an imaginary plane that is parallel to the longitudinal axis and the transverse axis, and a wedge angle (γ), which is defined between said upper section of the one of the lateral faces and the top face;
wherein a sum of the scissor angle (α) and the wedge angle (γ) is smaller than 70°.

4 more elements

A process for manufacturing a stationary cutting blade for a hair clipping device, comprising the steps of:

providing a piece of metal having a first thickness (t1) that serves as raw material;
creating a tapered shape into the piece of metal in order to create a rough shape of a tip of the stationary cutting blade;
stamping a preliminary teeth geometry into the tip to create a plurality of spaced-apart cutting teeth having a second thickness (t2) measured in parallel to the first thickness (t1), such that a thickness ratio between the first and the second thickness (t1/t2) is larger than 1.1;
coining the final teeth geometry by means of a coining die to form teeth with a substantially wedge-shaped cross-section, a top face, a bottom face and two opposing lateral faces running in between the top and the bottom face and to simultaneously form a cutting edge at the intersection between the top face and an upper section of one of the lateral faces, wherein at the cutting edge a scissor angle (α) is created, which is defined between the cutting edge and an imaginary plane that is parallel to a longitudinal axis and a transverse axis of the stationary cutting blade, and a wedge angle (γ) is created, which is defined between said upper section of the one of the lateral faces and the top face;
wherein a sum of the scissor angle (α) and the wedge angle (γ) is smaller than 70°.

2 more elements

Dependencies are inferred from the claim text.