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1. US20160279814 - Shaving apparatus as well as a cutting unit for such a shaving apparatus

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Claims

1. A cutting unit comprising an external cutting member and an internal cutting member which is drivable relative to the external cutting member in at least one driving direction, which internal cutting member comprises at least one cutting element comprising a cutting edge being movable along a cutting path whilst being driven in the at least one driving direction, which external cutting member comprises at least one hair-entry aperture which is bounded by at least a first wall portion and a second wall portion of the external cutting member, at least the first wall portion comprising a cutting edge for cooperation with the cutting edge of the internal cutting member, wherein at least an edge portion of the second wall portion facing a plane comprising the cutting path, in a cross section taken substantially perpendicularly to the plane comprising the cutting path, touches a virtual circle with a radius of at least 30 micrometer at at least two contact points on the virtual circle, and wherein tangents at two successive contact points of the at least two contact points where the edge portion touches the virtual circle, form and enclose an angle of at least 150 degrees.
2. The cutting unit according to claim 1, wherein the edge portion of the second wall portion, seen in a direction perpendicular to the driving direction, extends beyond the cutting path of the cutting edge of the internal cutting member.
3. The cutting unit according to claim 1, wherein the cutting unit is configured for a rotary type shaving apparatus, wherein the at least one driving direction is a single rotating driving direction, wherein the edge portion of the second wall portion, seen in a direction perpendicular to the rotating driving direction, is located within the cutting path of the cutting edge of the internal cutting member and opposite to the first wall portion.
4. The cutting unit according to claim 1, wherein the edge portion of the second wall portion has a radius of curvature of at least 40 micrometer.
5. The cutting unit according to claim 1, wherein the edge portion of the second wall portion facing the plane comprising the cutting path comprises a number of segments, wherein the segments in the cross section taken substantially perpendicularly to the plane comprising the cutting path, touch the virtual circle at the at least two contact points.
6. The cutting unit according to claim 1, wherein at least near the cutting path the first wall portion and the second wall portion are connected to each other by an intermediate wall portion forming a gradual transition from the cutting edge of the first wall portion to the edge portion of the second wall portion facing the plane comprising the cutting path.
7. The cutting unit according to claim 1, wherein the virtual circle is a first virtual circle and the edge portion is a first edge portion, wherein, in a cross section taken substantially perpendicularly to the plane comprising the cutting path, a second edge portion of the second wall portion touches, at at least two contact points a second virtual circle with a radius of less than half the radius of the first virtual circle touched by the first edge portion of the second wall portion.
8. The cutting unit according to claim 7, wherein the second virtual circle touched by the second edge portion of the second wall portion has a radius of less than 15 micrometer.
9. The cutting unit according to claim 1, wherein the cutting edge of the first wall portion, in a cross section taken substantially perpendicularly to the plane comprising the cutting path, includes an angle of 90 degrees or less.
10. A shaving apparatus provided with at least one cutting unit according to claim 1.
11. A cutting unit comprising an external cutting member and an internal cutting member which is drivable relative to the external cutting member in at least one driving direction, which internal cutting member comprises at least one cutting element comprising a cutting edge being movable along a cutting path whilst being driven in the at least one driving direction, which external cutting member comprises at least one hair-entry aperture which is bounded by at least a first wall portion and a second wall portion of the external cutting member, at least the first wall portion comprising a cutting edge for cooperation with the cutting edge of the internal cutting member, wherein at least an edge portion of the second wall portion facing a plane comprising the cutting path, in a cross section taken substantially perpendicularly to the plane comprising the cutting path, touches a virtual circle with a radius of at least 30 micrometer at at least two contact points of the at least two contact points on the virtual circle, and wherein tangents at two successive contact points where the edge portion of the second wall portion touches the virtual circle, enclose an angle of at least 150 degrees.
12. A cutting unit comprising an external cutting member and an internal cutting member which is drivable relative to the external cutting member in at least one driving direction, which internal cutting member comprises at least one cutting element comprising a cutting edge being movable along a cutting path whilst being driven in the at least one driving direction, which external cutting member comprises at least one hair-entry aperture which is bounded by at least a first wall portion and a second wall portion of the external cutting member, at least the first wall portion comprising a cutting edge for cooperation with the cutting edge of the internal cutting member, wherein at least a first edge portion of the second wall portion facing a plane comprising the cutting path, in a cross section taken substantially perpendicularly to the plane comprising the cutting path, touches a first virtual circle with a radius of at least 30 micrometer at at least two contact points on the first virtual circle, and wherein tangents at two successive contact points of the at least two contact points where the edge portion of the second wall portion touches the first virtual circle, enclose an angle of at least 150 degrees, wherein, in a cross section taken substantially perpendicularly to the plane comprising the cutting path, a second edge portion of the second wall portion touches, at at least two contact points of the at least two contact points a second virtual circle with a radius of less than half the radius of the first virtual circle touched by the first edge portion of the second wall portion.
13. The cutting unit according to claim 12, wherein the second virtual circle touched by the second edge portion of the second wall portion has a radius of less than 15 micrometer.