Hair cutting system and attachment

A hair cutting system comprising a cutting head and an attachment which is releasably connectable to the cutting head,

• the cutting head comprising:
• a stationary cutting member comprising:
• a first wall portion, a second wall portion, and a bent intermediate wall portion connecting the first and second wall portions, wherein a plurality of primary cutter teeth each having a bent cross-section is provided on the bent intermediate wall portion;
• a third wall portion, a fourth wall portion, and a bent further intermediate wall portion connecting the third and fourth wall portions, wherein a plurality of further primary cutter teeth each having a bent cross-section is provided on the bent further intermediate wall portion;
• and
• first and second sides spaced apart in a direction parallel to a cutter axis, and opposite third and fourth sides spaced apart in a direction perpendicular to the cutter axis, wherein the plurality of primary cutter teeth and the plurality of further primary cutter teeth are respectively provided on the opposite third and fourth sides;
• a movable cutting member moveable in a reciprocating manner along the cutter axis in a guiding space enclosed by the first and second wall portions and the third and fourth wall portions, wherein the movable cutting member comprises a plurality of secondary cutter teeth for co-operation with the primary cutter teeth and a plurality of further secondary cutter teeth for co-operation with the further primary cutter teeth,
• wherein the first wall portion and the second wall portion each has an inner surface and an outer surface, wherein the inner surfaces of the first and second wall portions face each other, and wherein the outer surface of the first wall portion is part of a skin facing surface of the cutting head which faces a user's skin during operation,
• wherein the third wall portion and the fourth wall portion each has an inner surface and an outer surface, wherein the inner surfaces of the third and fourth wall portions face each other, and wherein the outer surface of the third wall portion is part of the skin facing surface of the cutting heads,
• wherein the plurality of primary cutter teeth define a cutting zone of the cutting head extending parallel to the cutter axis and having a length,
• wherein the plurality of further primary cutter teeth define a further cutting zone of the cutting head extending parallel to the cutter axis and having a further length;
• and
• the attachment comprising:
• first and second side portions configured to cover, respectively, the first and second sides of the stationary cutting member when the attachment is connected to the cutting head;
• and
• an intermediate portion interconnecting the first and second side portions of the attachment, and is configured to cover the outer surface of each of the first wall portion and the third wall portion of the stationary cutting member when the attachment is connected to the cutting head;
• and
• wherein, when the attachment is connected to the cutting head:
• the first and second side portions of the attachment protrude relative to the primary cutter teeth and the further primary cutter teeth in the direction perpendicular to the cutter axis and parallel to the first wall portion and the third wall portion of the stationary cutting member;
• and
• the first and second side portions of the attachment and the intermediate portion of the attachment define a recess exposing the primary cutter teeth and a further recess exposing the further primary cutter teeth, each of the recess and the further recess extending in the direction parallel to the cutter axis and being non-interrupted in the direction parallel to the cutter axis over a distance of at least 50% of the length of the cutting zone and the further cutting zone respectively, and
• wherein the first and second side portions of the attachment each has a convex outer surface, seen in a cross-section parallel to the first wall portion of the stationary cutting member when the attachment is connected to the cutting head, and wherein each of the recess and the further recess is bounded by a continuous longitudinal edge of the intermediate portion which, when the attachment is on the first and third wall portions of the stationary cutting member, extends in the direction parallel to the cuter axis.

A system including an attachment releasably connected to a cutting head of a hair cutting device, the cutting head comprising:

• a stationary cutting member comprising a first wall portion, a second wall portion, and a bent intermediate wall portion connecting the first and second wall portions, wherein a plurality of primary cutter teeth each having a bent cross-section is provided on the bent intermediate wall portion;
• and
• a movable cutting member moveable in a reciprocating manner along a cutter axis in a guiding space enclosed by the first and second wall portions of the stationary cutting member, wherein the movable cutting member comprises a plurality of secondary cutter teeth for co-operation with the primary cutter teeth,
• wherein the first wall portion and the second wall portion each has an inner surface and an outer surface, wherein the inner surfaces of the first and second wall portions face each other, and wherein the outer surface of the first wall portion is part of a skin facing surface of the cutting head which faces a user's skin during operation,
• wherein the plurality of primary cutter teeth define a cutting zone of the cutting head extending parallel to the cutter axis and having a lengths, and
• wherein the stationary cutting member has opposite first and second sides spaced apart in a direction parallel to the cutter axis;
• and
• the attachment comprising:
• first and second side portions configured to cover, respectively, the first and second sides of the stationary cutting member;
• and
• an intermediate portion interconnecting the first and second side portions of the attachment and configured to cover the outer surface of the first wall portion of the stationary cutting member;
• and
• wherein the first and second side portions of the attachment protrude relative to the primary cutter teeth in a direction perpendicular to the cutter axis and parallel to the first wall portion, and
• wherein the first and second side portions of the attachment and the intermediate portion define opposite recesses respectively exposing the primary cutter teeth, each recess extending in the direction parallel to the cutter axis and being non-interrupted in the direction parallel to the cutter axis over a distance of at least 50% of the length of the cutting zone,
• wherein the first and second side portions of the attachment each has a convex outer surface, seen in a cross-section parallel to the first wall portion of the stationary cutting member and parallel to the cutter axis, extending outwardly from the intermediate portion past the first and second sides of the stationary cutting member in opposite directions parallel to the cutter axis, and
• wherein each recess is bounded by a continuous longitudinal edge of the intermediate portion which, when the attachment is on the first wall portion of the stationary cutting member, extends in the direction parallel to the cuter axis.