Cutting unit with guard teeth and hair-cutting device
AssigneeKoninklijke Philips Electronics N.V.
InventorHannes Floessholzer
Life of this patent
Estimating the term…
Abstract
To minimize the risk for injuries due to hooked hair catching teeth, but still have a reasonable hair-cutting efficiency, a cutting unit (107) for a hair-cutting device (100) having two blades (202, 206) moving relatively to each other with at least one of the blades (202, 206) being toothed is proposed, wherein at least some teeth (208) have a larger cross-sectional area (CA) at their free end (210) than at their end (212) making the junction with the blade (206), wherein the larger cross-sectional area (CA) is 0.3 mm2 or more and wherein the shape of the larger cross-sectional area (CA) is such that the tooth (208) surface oriented to face the surface (305) with hair (301) to be cut when cutting has a larger distance to the middle axis (M) than the equivalent surface of the blade-side-end (212).
Claims8
A haircutting device with a cutting unit, the cutting unit comprising:
- a plurality of blades configured to be moved relative to each other;
- and
- a plurality of teeth, each of the plurality of teeth having a free end and a junction end joined to a corresponding end of one of the plurality of blades,
- wherein at least some teeth have a larger cross-sectional area at the free end than at the junction end joined to the corresponding end of one of the plurality of blades,
- wherein the larger cross-sectional area is at least 0.32 mm2,
- wherein a distance from a surface of the free end facing a skin with hair to be cut to a middle axis of the tooth is greater than a distance from a surface of the blade facing the skin to the middle axis of the tooth, and
- wherein, for the teeth with the larger cross-sectional area, a distance from a surface of the free end opposite the surface facing the skin to the middle axis of the tooth is greater than a distance from a surface of the blade opposite the surface facing the skin to the middle axis of the tooth.
A cutting unit for a hair-cutting device, comprising:
- two blades configured to be moved relative to each other;
- and
- a plurality of teeth joined to a portion of each blade, each tooth having a free end and an end joined to the blade,
- wherein at least some teeth have a larger cross-sectional area at the free end than at the end joined to the blade,
- wherein the larger cross-sectional area is at least 0.3 mm2,
- wherein, for the teeth with the larger cross-sectional area, a distance from a surface of the free end facing a skin with hair to be cut to a middle axis of the tooth is greater than a distance from a surface of the blade facing the skin to the middle axis of the tooth, and
- wherein, for the teeth with the larger cross-sectional area, a distance from a surface of the free end opposite the surface facing the skin to the middle axis of the tooth is greater than a distance from a surface of the blade opposite the surface facing the skin to the middle axis of the tooth.
Dependencies are inferred from the claim text.