Abstract: In a reciprocation type electric shaver having an outside blade unit detachable from a main body, the outside blade unit comprises a main blade, a slit blade and an outside blade holder for holding the main blade and the slit blade capable of floating up and down. A coupling structure for coupling the slit blade on the outside blade holder has a retaining structure for engaging the slit blade and the outside blade holder in a lateral direction of the outside blade unit so as to prevent disengagement of the slit blade from the outside blade holder when the slit blade is floated up and down with inclination. The retaining structure is a pair of fitting recesses formed on the slit blade and a pair of fitting protrusions formed on the outside blade holder.

Abstract: A dry shaver has an elongated shaving head with a lengthwise axis. The shaving head carries semi-cylindrical first and second outer cutters disposed on its opposite width ends, and a semi-cylindrical finishing cutter and a slit cutter interposed between the first and second outer cutters. The finishing cutter has a finishing foil which is deeply curved than a foil of the first and second outer cutters into an arcuate contour having a width less than that of the first and second outer cutters. The finishing foil disposed behind the first outer cutter comes into contact with a user's skin to make closer shaving than the first and second cutters. A skin guard project between the first outer cutter and the finishing cutter to protect the skin from being pressed excessively to a side of the finishing foil when moving the shaving head across a user' skin with the first outer cutter leading in a moving direction, thereby reducing skin irritation.

Abstract: A dry shaver has an elongated shaving head with a lengthwise axis. The shaving head carries semi-cylindrical first and second outer cutters disposed on its opposite width ends, as well as a semi-cylindrical finishing cutter and a slit cutter Interposed between the first and second outer cutters. The finishing cutter has a finishing foil which is deeply curved than a foil of the first and second outer cutters into an arcuate contour having a width less than that of the first and second outer cutters. The finishing foil disposed behind the first outer cutter comes into contact with a user's skin to make closer shaving than the first and second cutters.

Abstract: A shaving foil for a dry shaver has a plurality of perforation arranged in an array. The shaving foil is formed in its skin contact surface with a plurality of recesses which define a thin section of reduced thickness at the recesses, while leaving thick sections at the remainder of the foil. Each perforation is configured to have its circumference defined partly by the thin section and partly by the thick section. Both of the thin and thick sections can come into contact with a user's skin for smoothly guiding hairs into the perforations to make close shaving without irritating the skin, while the shaving foil is moved across the skin. Especially, the thin sections act to cut the hairs shorter than the thick section, as wall as to raise flattened hairs into the perforations for successfully cutting the flattened hairs.

Abstract: An electric shaver includes net-shaped outer blades; and inner blades sliding reciprocally over an inner side of the outer blades as detachably connected with driving units driven by a motor. Each of the inner blades includes a blade plate having an inversed-like-U shape seen from a longitudinal direction in parallel with a reciprocating sliding direction; and a blade holder having attaching portions to be attached to the blade plate in longitudinally defined end regions, wherein connection portions to be detachably connected with the driving units are provided at the blade holder in a longitudinally defined center region, and, when dissembling the blade holder from the driving units, anti-detach portions are provided to thereby prevent separation of the blade holder in the longitudinally defined center region from the blade plate in the longitudinally defined center region due to a tensile load between the connection portions and the driving units.

Abstract: An inner cutter of an electric shaver that cuts hairs by sliding along an inner surface of an outer cutter includes a base portion that is connected to a driving unit, a plurality of cutting pieces that are formed in a U-shape and whose both ends in the longitudinal direction are fixed to the base portion, and a plate member whose one end is fixed to the base portion and the other end is connected to the cutting piece. The plate member is elastically deformed corresponding to elastic deformation of the cutting piece.

Abstract: The electric shaver in accordance with the present invention comprises a hand grip 10 configured to be gripped by a user's hand, and a blade head 20 provided on an upper end of the hand grip. The blade head carries at least one shaving unit 50 comprising an outer blade foil 70 and an inner blade 80 driven in a shearing engagement manner with the outer blade foil. The outer blade foil has a plurality of holes in which hairs are introduced. The outer blade foil is elongated and has a length, and is curved along a width direction to form a generally C-shaped cross section, and is curved convexly and uniformly along its length to have a longitudinal curved outline. The feature of the present invention resides in that a radius of curvature of the longitudinal curved outline is 150 mm to 350 mm.

Abstract: In a reciprocation type electric shaver having an outside blade unit detachable from a main body, the outside blade unit comprises a main blade, a slit blade and an outside blade holder for holding the main blade and the slit blade capable of floating up and down. A coupling structure for coupling the slit blade on the outside blade holder has a retaining structure for engaging the slit blade and the outside blade holder in a lateral direction of the outside blade unit so as to prevent disengagement of the slit blade from the outside blade holder when the slit blade is floated up and down with inclination. The retaining structure is a pair of fitting recesses formed on the slit blade and a pair of fitting protrusions formed on the outside blade holder.

Abstract: A shaving head for a dry shaver is capable of increasing the cutting efficiency, yet allowing the use of the inner cutter of simple structure. The shaving head has a slit cutter unit composed of an outer cutter shaped to have a top surface for contact with a user's skin, and an inner cutter in contact with a bottom surface of the outer cutter. The outer cutter has a U-shaped structure with a pair of legs connected by a crossbar, and to have a plurality of slits which are spaced in a lengthwise axis of the outer cutter to leave a plurality of bridges each between the adjacent ones of the slits. The slits extend continuously over a full width of the crossbar and into upper ends of the legs in a direction generally perpendicular to the lengthwise axis, giving two straight slit paths respectively on opposite width ends of the outer cutter. The straight slit paths on the opposite width ends are staggered with respect to each other along the lengthwise axis.

Abstract: An inner cutter for a dry shaver has a plurality of blades 30 supported on a base 20 and is driven in hair-shearing engagement with an outer cutter 10 for cutting the hairs. The blades 30 are arranged in parallel with each other and are each provided on opposite sides at its top with cutting edges 32. The cutting edge 32 is defined between the top face of the blade and a rake fade 33 on the underside of the blade. The rake face 33 is inclined with respect to the top face at an angle of ? (°), while the cutting edge is rounded at its tip to have a curvature radius R (?m) which satisfies a relation that R??0.067·?+4.7. With this result, the cutting resistance for cutting the hair can be lowered below a load necessary for bending the hair. Thus, the blade of the inner cutter can itself cut the hair without bending the hair, giving a flat cutting plane finish and enabling a close shave only with a fewer shaving strokes.

Abstract: An inner cutter for a dry shaver has a plurality of blades 30 supported on a base 20 and is driven in hair-shearing engagement with an outer cutter 10 for cutting the hairs. The blades 30 are arranged in parallel with each other and are each provided on opposite sides at its top with cutting edges 32. The cutting edge 32 is defined between the top face of the blade and a rake fade 33 on the underside of the blade. The rake face 33 is inclined with respect to the top face at an angle of &agr; (°), while the cutting edge is rounded at its tip to have a curvature radius R (&mgr;m) which satisfies a relation that R≧−0.067·&agr;+4.7. With this result, the cutting resistance for cutting the hair can be lowered below a load necessary for bending the hair. Thus, the blade of the inner cutter can itself cut the hair without bending the hair, giving a flat cutting plane finish and enabling a close shave only with a fewer shaving strokes.