Shaver provided with a shaving head having a sub-frame and a main frame
The invention relates to a shaving device which comprises a shaving head ( 1 ) having at least one cutting blade ( 5 ) and two skin-supporting members ( 11, 13 ), said cutting blade comprising a cutting edge ( 7 ) extending perpendicularly to a shaving direction (X) of the shaving head, and said skin-supporting members, viewed in the shaving direction, being arranged, respectively, in front of and behind said cutting blade, and defining a contact surface ( 17 ) between the shaving head and a skin surface ( 53 ) to be treated. The cutting blade and the skin-supporting members are mounted to a sub-frame ( 9 ), which is coupled to a main frame ( 19 ) and can be displaced with respect to said main frame against a spring force (F S ). According to the invention, the main frame comprises two further skin-supporting members ( 21, 23 ) which, viewed in the shaving direction, are arranged, respectively, in front of and behind the sub-frame and extend substantially in said contact surface. As a result, a contact force (F C ) between the skin surface and the skin-supporting members of the sub-frame and hence a skin curvature (w 2 ) between the skin-supporting members of the sub-frame, i.e. at the location of the cutting member, is mainly determined by the value of said spring force and, accordingly, substantially independent of a pressure force (F P ) exerted by a user to press the shaving head against the skin surface.
1. A shaver comprising a shaving head including at least one cutting blade and two skin-supporting members, the cutting blade having a cutting edge extending perpendicularly to a shaving direction of the shaving head, and the skin-supporting members being arranged, viewed in the shaving direction, respectively, in front of and behind the cutting blade and extending substantially in a contact surface wherein, in operation, the shaving head contacts a skin surface to be treated, while the cutting blade and the skin-supporting members are secured to a sub-frame, which is coupled to a main frame and can be displaced, against a spring force, with respect to the main frame, wherein:
the main frame comprises two further skin-supporting members which, viewed in the shaving direction, are arranged, respectively, in front of and behind the sub-frame and which extend substantially in the contact surface;
the sub-frame is secured to the main frame by means of a mechanical spring unit, and is at least tiltable with respect to the main frame about two mutually perpendicular tilt axes and displaceable with respect to the main frame in a displacement direction perpendicular to said tilt axes, thereby deforming the spring unit;
the mechanical spring unit comprises a central portion and two pairs of leaf springs facing away from each other, which leaf springs each extend from the central portion in a direction substantially perpendicular to the shaving direction, and each support the sub-frame at a location close to a corner, and
the central portion of the spring unit is provided with a sphere segment-shaped supporting element with which the spring unit rests against the main frame.
2. A shaver comprising a shaving head including at least one cutting blade and two skin-supporting members, the cutting blade having a cutting edge extending perpendicularly to a shaving direction of the shaving head, and the skin-supporting members being arranged, viewed in the shaving direction, respectively, in front of and behind the cutting blade and extending substantially in a contact surface wherein, in operation, the shaving head contacts a skin surface to be treated, while the cutting blade and the skin-supporting members are secured to a sub-frame, which is coupled to a main frame and can be displaced, against a spring force, with respect to the main frame, wherein:
the main frame comprises two further skin-supporting members which, viewed in the shaving direction, are arranged, respectively, in front of and behind the sub-frame and which extend substantially in the contact surface; and the shaving head is provided with means for adjusting the spring force.
3. A shaving head which can suitably be used in a shaver as claimed in claim 2 .