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1. WO2013093718 - IMPROVED SHAVING HEAD WITH DOMING CONTROL

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[ EN ]

CLAIMS:

1. A cutter (4) for a rotary shaver comprising a support member (14) having an axis of rotation and carrying a plurality of upstanding legs (16), each leg terminating in a distal portion (18) having a forward face (26), angled at a cutter angle (a) with respect to a direction of movement of the leg, and an upper face (22) intersecting with the forward face in a cutting edge (24), wherein the upper face is convex in a plane perpendicular to the direction of movement for engagement with a concave inner surface of a shaving track of a cap (2) of the rotary shaver, characterized in that at least an upper portion of the forward face (22) including the cutting edge (24) is concave in a plane perpendicular to the axis of rotation.

2. The cutter according to claim 1, wherein the cutting edge lies in a plane parallel to the axis of rotation.

3. The cutter according to claim 1 or claim 2, wherein the cutting edge extends in a radial plane with respect to the axis of rotation.

4. The cutter according to any preceding claim, wherein the cutter angle is between 35 0 and 700 to the direction of movement, preferably between 400 and 50 °.

5. The cutter according to any preceding claim, wherein the convex upper face is a circular cylindrical face having a first radius R and the concave forward face is a circular cylindrical face having a second radius r, wherein r is selected depending on the cutter angle such that R = r.cos(a).

6. A cutter unit (1) for a rotary shaver comprising a cutter according to any preceding claim and a cap, the cap comprising a shaving track (8) having a concave inner surface (12) for engagement by the convex upper face of the cutter distal portion and a plurality of slots (30) for passage of hairs to be cut.

7. The cutter unit according to claim 6, wherein the shaving track has a domed upper surface (10).

8. The cutter unit according to claim 6 or claim 7, wherein the cutting edge and a cutting surface (32) of at least one of the slots are angled with respect to each other at a shearing angle (β) and the shearing angle is constant over a radial extent of said at least one of the slots.

9. The cutter unit according to any of claims 6 to 8, wherein the slots are angled to a radial direction with respect to the axis of rotation.

10. The cutter unit according to any of claims 6 to 9, wherein the slots are straight, each slot lying in a plane parallel to the axis of rotation.

11. The cutter unit according to any of claims 6 to 10, wherein the concave inner surface follows the profile of a torus, having a partially circular cross-section.

12. The cutter unit according to any of claims 6 to 11, wherein the cap has a plurality of concentric shaving tracks.

13. A shaver comprising one or more cutter units according to any of claims 6 to 12 and a drive unit to cause rotation of the cutter(s) of the one or more cutter units.

14. The shaver according to claim 13, comprising two cutter units.

15. The shaver according to claim 13, comprising three cutter units arranged at the vertices of an equilateral triangle.