Dry shaver

• US 7,739,798 B2
• Filed: 12/07/2007
• Issued: 06/22/2010
• Est. Priority Date: 12/08/2006
• Status: Active Grant

• Current Assignee: Panasonic Electric Works Company Limited (Panasonic Holdings Corporation)
• Original Assignee: Panasonic Electric Works Company Limited (Panasonic Holdings Corporation)
• Inventors: Fujimoto, Shinji, Shimizu, Hiroaki, Sato, Masaaki, Komori, Shunsuke, Shiba, Takeshi, Iwasaki, Jyuzaemon
• Primary Examiner(s): PAYER, HWEI SIU CHOU
• Application Number:
  US11/952,145
• Publication Number:
  US 20080134514A1
• Time in Patent Office: 928 Days
• Field of Search: 30/439, 30/439.1, 30/439.2, 303/465.1
• US Class Current: 30/43.92
• CPC Class Codes: B26B 19/10 involving two or more different types of reciprocating cutting elements, e.g. a pair of toothed shearing elements combined with a pair of perforated cutting elements or a combined toothed and perforated cutting assembly

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.

Claims

1. A dry shaver comprising:

a shaving head which is elongated to have a lengthwise axis and a width axis, said shaving head being configured to carry a semi-cylindrical first outer cutter, a semi-cylindrical finishing cutter, a slit cutter, and a semi-cylindrical second outer cutter which are all elongated along said lengthwise axis and are arranged in generally parallel relation with each other,

each of said first and second outer cutters comprising a main foil with a number of perforations and an inner cutter driven by a motor to move in sliding contact with said foil, said main foil being curved about an axis parallel with said lengthwise axis into an arcuate contour;

said slit cutter comprising an elongated outer blade with a number of slits opened at lateral edges of said outer blade, and an inner cutter driven to move in sliding contact with said outer blade,

said finishing cutter comprising a finishing foil with a number of perforations and an inner cutter driven by said motor to move in sliding contact with said finishing foil, said finishing foil being curved about an axis parallel with said lengthwise axis into an arcuate contour having a width perpendicular to said lengthwise axis,

wherein

said first and second outer cutters are disposed on opposite width ends of said shaving head with said finishing cutter and said slit cutter being disposed between said first and second outer cutters, and

wherein said finishing foil is shaped to have the width less than that of said main foil and to have a thin section of reduced thickness at least around a portion of each perforation relative to said main foil.

2. A dry shaver as set forth in claim 1, wherein

said finishing foil is configured to have the perforations each surrounded partly by said thin section and partly by a thick section, said thin section defined by a recess formed in a top skin contacting surface of said finishing foil.

3. A dry shaver as set forth in claim 1, wherein

said shaving head includes a frame which is configured to floatingly support said main foils, and said finishing foil, and

said main foils and said finishing foil are spring-biased for pressed contact with a user'"'"'s skin,

said main foil of the second outer cutter is given a spring bias greater than those given to said finishing foil and said main foil of said first outer cutter.

4. A dry shaver as set forth in claim 1, wherein

said first outer cutter is located to have its top end lower than that of said second outer cutter.

6. A dry shaver as set forth in claim 1, wherein

said finishing foil is shaped to have the width less than that of said main foil and to have the thin section of reduced thickness at least around a portion of each perforation relative to said main foil.

5. A dry shaver comprising:

a shaving head which is elongated to have a lengthwise axis and a width axis, said shaving head being configured to carry a semi-cylindrical first outer cutter, a semi-cylindrical finishing cutter, a slit cutter, and a semi-cylindrical second outer cutter which are all elongated along said lengthwise axis and are arranged in generally parallel relation with each other,

each of said first and second outer cutters comprising a main foil with a number of perforations and an inner cutter driven by a motor to move in sliding contact with said foil, said main foil being curved about an axis parallel with said lengthwise axis into an arcuate contour;

said slit cutter comprising an elongated outer blade with a number of slits opened at lateral edges of said outer blade, and an inner cutter driven to move in sliding contact with said outer blade,

said finishing cutter comprising a finishing foil with a number of perforations and an inner cutter driven by said motor to move in sliding contact with said finishing foil, said finishing foil being curved about an axis parallel with said lengthwise axis into an arcuate contour having a width perpendicular to said lengthwise axis,

wherein

said first and second outer cutters arc disposed on opposite width ends of said shaving head with said finishing cutter and said slit cutter being disposed between said first and second outer cutters, and

said finishing foil is shaped to have the width less than that of said main foil or to have thin section of reduced thickness at least around a portion of each perforation in relation to said main foil,

wherein

said shaving head includes a frame which is configured to floatingly support said main foils, and said finishing foil, and

said main foils and said finishing foil are spring-biased for pressed contact with a user'"'"'s skin,

said main foil of the second outer cutter is given a spring bias greater than those given to said finishing foil and said main foil of said first outer cutter,

wherein said finishing foil is coupled to said main foil of said first outer cutter by means of an adjustor spring so as to be urged from said main foil of said first outer cutter in a direction of being pressed against the user'"'"'s skin.

7. A dry shaver as set forth in claim 5, wherein

said finishing foil is configured to have the perforations each surrounded partly by said thin section and partly by a thick section, said thin section defined by a recess formed in a top skin contacting surface of said finishing foil.

8. A dry shaver as set forth in claim 5, wherein

said first outer cutter is located to have its top end lower than that of said second outer cutter.

9. A dry shaver comprising:

a shaving head which is elongated to have a lengthwise axis and a width axis, said shaving head being configured to carry a semi-cylindrical first out cutter, a semi-cylindrical finishing cutter, a slit cutter, and a semi-cylindrical second outer cutter which are all elongated along said lengthwise axis and are arranged in generally parallel relation with each other,

each of said first and second outer cutters comprising a main foil with a number of perforations and an inner cutter driven by a motor to move in sliding contact with said foil, said main foil being curved about an axis parallel with said lengthwise axis into an arcuate contour,

said slit cutter comprising an elongated outer blade with a number of slits opened at lateral edges of said outer blade, and an inner cutter driven to move in sliding contact with said outer blade,

said finishing cutter comprising a finishing foil with a number of perforations and an inner cutter driven by said motor to move in sliding contact with said finishing foil, said finishing foil being curved about an axis parallel with said lengthwise axis into an arcuate contour having a width perpendicular to said lengthwise axis;

wherein

said first and second outer cutters are disposed on opposite width ends of said shaving head with said finishing cutter and said slit cutter being disposed between said first and second outer cutter, and

said finishing is shaped to have the width less than that of said main foil or to have a thin section of reduced thickness at least around a portion of each perforation in relation to said main foil,

wherein

said shaving head includes a frame which is configured to floatingly support said main foils, and said finishing foil, and

said main foils and said finishing foil are spring-biased for pressed contact with a user'"'"'s skin,

said main foil of the second outer cutter is given a spring bias greater than those given to said finishing foil and said main foil of said first outer cutter,

wherein

said outer blade of said slit cutter is floatingly supported to said frame, and

said outer blade is coupled to said finishing foil by means of an adjustor spring so as to be urged from said finishing foil in a direction of being pressed against the user'"'"'s skin.

10. A dry shaver as set forth in claim 9, wherein

said finishing foil is shaped to have the width less than that of said main foil and to have the thin section of reduced thickness at least around a portion of each perforation relative to said main foil.

11. A dry shaver as set forth in claim 9, wherein

said finishing foil is configured to have the perforations each surrounded partly by said thin section and partly by a thick section, said thin section defined by a recess formed in a top skin contacting surface of said finishing foil.

12. A dry shaver as set forth in claim 9, wherein

said first outer cutter is located to have its top end lower than that of said second outer cutter.