US3919770A - Outer cutting blade for electric dry shaver - Google Patents

Outer cutting blade for electric dry shaver Download PDF

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Publication number
US3919770A
US3919770A US395403A US39540373A US3919770A US 3919770 A US3919770 A US 3919770A US 395403 A US395403 A US 395403A US 39540373 A US39540373 A US 39540373A US 3919770 A US3919770 A US 3919770A
Authority
US
United States
Prior art keywords
blade
ribs
openings
cutting blade
combination
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US395403A
Other languages
English (en)
Inventor
Satoshi Sakai
Norio Shimizu
Junji Nomura
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Panasonic Electric Works Co Ltd
Original Assignee
Matsushita Electric Works Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from JP47092442A external-priority patent/JPS5244264B2/ja
Priority claimed from JP12908072U external-priority patent/JPS53391Y2/ja
Application filed by Matsushita Electric Works Ltd filed Critical Matsushita Electric Works Ltd
Application granted granted Critical
Publication of US3919770A publication Critical patent/US3919770A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26B—HAND-HELD CUTTING TOOLS NOT OTHERWISE PROVIDED FOR
    • B26B19/00—Clippers or shavers operating with a plurality of cutting edges, e.g. hair clippers, dry shavers
    • B26B19/38—Details of, or accessories for, hair clippers, or dry shavers, e.g. housings, casings, grips, guards
    • B26B19/384—Dry-shaver foils; Manufacture thereof

Definitions

  • ABSTRACT An outer cutting blade for use with electric dry shavers employing rotary type inner cutting blade, which comprises a plurality of spiral rib portions respectively extending from the center to the vicinity of outer periphery of the blade, and a plurality of hair inlet holes provided between the respective adjacent ones of said spiral rib portions.
  • the holes are so arranged that their longitudinal direction will substantially coincide with the radial direction of the blade.
  • This invention relates to outer cutting blades for electric dry shavers.
  • the outer cutting blade for conventional electric shavers there have been used, for example, such net blade A wherein hair inlet holes a. are made in the form of a net as shown in FIG. 1 or such outer cutting blade A" wherein hair inlet holes a' are arranged on concentric circles as shown in FIG. 2.
  • the net blade A shown in FIG. 1 has defects that, as the holes a are hexagonal, long hairs are hard to be led into these holes, the opening rate, that is, the rate of the area of the holes to the total surface area of the net blade is small, the rib b between the respective holes a is narraow in some part and, therefore, the strength against the external pressing force is low.
  • the above mentioned problems have been successfully solved by providing several spiral ribs in the outer peripheral direction from the center in the outer cutting blade and forming hair inlet holes betwen the adjacent ribs in such that the lengthwise direction of each hole will substantially coincide with the radial direction of the outer cutting blade.
  • the present invention has such excellent features that:
  • the angle of the intersection of the side edge of the hair inlet hole in the outer blade with the rotary inner blade, that is, cutting blade angle can be made constant for each hole and, therefore, the cutting blade angle in any position can be set at a desirable value.
  • the stationary blade is made stronger and more resistant to forces normal to the blade as compared to a blade having an overall net pattern or one in which the ribbing is concentric such as in the prior art illustrated in FIGS. 1 and 2.
  • FIGS. I and 2 show outer cutting blades for conventional dry shavers
  • FIG. 3 shows an embodiment of the outer cutting blade for the dry shavers according to the present invention
  • FIG. 4 shows another embodiment of the present invention
  • I FIGS. 5 and 6 are explanatory views of the cutting blade angle according to the present invention.
  • A is a blade surface
  • a plurality of spiral ribs b are made in the outer peripheral direction from the center on said surface A and hair inlet holes a are formed between the adjacent ribs in the form of slits whose lengthwise direction substantially coincides with the radial direction of the outer cutting blade.
  • hair inlet holes 0 of a fixed length are formed at regular intervals to form a ring adjacent the outer peripheral side of the blade surface A, plurality of spiral ribs b are made in the outer peripheral direction from the center between the outer peripheral inlet holes c on the adjacent ring and the center of the blade surface, and inlet holes a are made so that the so-called holding angle 6 made by the cutting edge line d of the inner cutting blade D rotating while in contact with the outer cutting blade inside the outer cutting blade and the side in the lengthwise direction of each inlet hole a will be always constant in any position as shown in FIG. 5 between the adjacent spiral ribs b.
  • the length in the lengthwise direction of the inlet hole a is made gradually shorter, the longer diameter L and shorter diameter L of the respective holes a are made inversely proportional with each other, and both ends of the respective inlet holes a are formed to be substantially arcuate.
  • the hair holding angle formed by the inner cutting blade edge and the edge of the respective holes in the outer cutting blade is constant in any place and, if an optimum holding angle 6 (of about 20) at which the hair cutting efficiency is the highest is adopted, the cutting efficiency of the entire surface of the blade will be able to be improved, (ii) as the dimensions of the longer diameter and shorter diameter of the respective holes over the blade are made inversely proportional with each other, hairs can be led in and can be cut to be short without biting skin surface or irritating skins.
  • a circular stationary blade in the form of a thin metallic membrane is provided as illustrated particularly in FIGS. 3 and 4.
  • Cooperating with the stationary blade is a rotary blade having a generally radially oriented cutting edge.
  • the stationary blade is distinguished by a plurality of uniopening spanning the space between adjacent ribs and extending in a generally radial direction.
  • the ribs are more closely spaced as they spiral inwardly toward the center, with the length of the openings being correspondingly reduced in the central region.
  • the openings each have their longitudinal dimension oriented to produce a shallow shearing angle with respect to the cutting edge of the blade, the shearing angle being preferably on the order of It is one of the features of the embodiment shown in FIG.
  • each rib is of limited arcuate length, preferably on the order of 180 but in any event less than a full revolution.
  • a cutting blade assembly for a dry shaver including a circular stationary blade in the form of a thin metallic membrane and a rotating blade having a generally radially oriented cutting edge rotating concentrically against the stationary blade, the stationary blade having a plurality of uniformly interfitting smoothly continuous spiral ribs, adjacent ribs having formed between them a plurality of elongated hair inlet openings with adjacent openings closely spaced generally parallel to one another and with the longitudinal dimension of each opening spanning the space between adjacent ribs, the ribs being more closely spaced as they spiral inwardly toward the center with the length of the openings being correspondingly reduced, the openings having a slight incremental angle between them so that ad jacent openings bear substantially the same shallow angle with respect to the blade, with the longitudinal dimension of each opening extending in a symmetrically angled but generally radial direction.
  • each rib has an arc of at least about but less than 360.

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Forests & Forestry (AREA)
  • Mechanical Engineering (AREA)
  • Dry Shavers And Clippers (AREA)
US395403A 1972-09-13 1973-09-10 Outer cutting blade for electric dry shaver Expired - Lifetime US3919770A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP47092442A JPS5244264B2 (xx) 1972-09-13 1972-09-13
JP12908072U JPS53391Y2 (xx) 1972-11-09 1972-11-09

Publications (1)

Publication Number Publication Date
US3919770A true US3919770A (en) 1975-11-18

Family

ID=26433863

Family Applications (1)

Application Number Title Priority Date Filing Date
US395403A Expired - Lifetime US3919770A (en) 1972-09-13 1973-09-10 Outer cutting blade for electric dry shaver

Country Status (5)

Country Link
US (1) US3919770A (xx)
DE (1) DE2342677C2 (xx)
FR (1) FR2203306A5 (xx)
GB (1) GB1437445A (xx)
IT (1) IT994220B (xx)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4180906A (en) * 1977-10-31 1980-01-01 May Russell P Razor with orbiting discs with sharp-edge slots, and method for making discs
US5329702A (en) * 1992-04-17 1994-07-19 Izumi Products Company Electric razor
CN1044986C (zh) * 1993-03-18 1999-09-08 褚新栋 电动剃须器
CN1293999C (zh) * 2003-02-26 2007-01-10 株式会社泉精器制作所 旋转式电动剃须刀
US20090025228A1 (en) * 2004-11-01 2009-01-29 Koninklijke Philips Electronics N.V. Inner cutter with cutter blades at different radii, method for manufacturing such unit, shaver head and rotary shaver provided therewith
US20120110854A1 (en) * 2010-11-08 2012-05-10 Izumi Products Company Rotary electric shaver
US20160183978A1 (en) * 2014-09-19 2016-06-30 Chibuzo Aniemena Callous, dead, dry or hard skin remover
CN112088075A (zh) * 2018-05-01 2020-12-15 皇家飞利浦有限公司 剃刮单元和剃刮器具

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0162393U (xx) * 1987-10-12 1989-04-20

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2119021A (en) * 1938-01-15 1938-05-31 Frederick E Moskovies Shaving apparatus
US2677885A (en) * 1950-09-08 1954-05-11 Kenneth W Chaun Shaving apparatus
US2742694A (en) * 1950-08-02 1956-04-24 Charles G Stone Mechanical shaver

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH246511A (de) * 1943-12-13 1947-01-15 W Degele Peter Scherkopf für Trockenrasierapparate.
DE1856031U (de) * 1961-03-02 1962-08-02 Suhl Elektrogeraete Veb K Scherkammfolie fuer trockenrasiergeraete.
NL6612851A (xx) * 1966-09-13 1968-03-14
BE759429A (fr) * 1969-12-05 1971-04-30 Carinthia Elektrogeraete Gmbh Rasoir a sec

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2119021A (en) * 1938-01-15 1938-05-31 Frederick E Moskovies Shaving apparatus
US2742694A (en) * 1950-08-02 1956-04-24 Charles G Stone Mechanical shaver
US2677885A (en) * 1950-09-08 1954-05-11 Kenneth W Chaun Shaving apparatus

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4180906A (en) * 1977-10-31 1980-01-01 May Russell P Razor with orbiting discs with sharp-edge slots, and method for making discs
US5329702A (en) * 1992-04-17 1994-07-19 Izumi Products Company Electric razor
CN1044986C (zh) * 1993-03-18 1999-09-08 褚新栋 电动剃须器
CN1293999C (zh) * 2003-02-26 2007-01-10 株式会社泉精器制作所 旋转式电动剃须刀
US20090025228A1 (en) * 2004-11-01 2009-01-29 Koninklijke Philips Electronics N.V. Inner cutter with cutter blades at different radii, method for manufacturing such unit, shaver head and rotary shaver provided therewith
US8245404B2 (en) * 2004-11-01 2012-08-21 Koninklijke Philips Electronics N.A. Inner cutter with cutter blades at different radii, method for manufacturing such unit, shaver head and rotary shaver provided therewith
US20120110854A1 (en) * 2010-11-08 2012-05-10 Izumi Products Company Rotary electric shaver
US20180361600A1 (en) * 2010-11-08 2018-12-20 Izumi Products Company Rotary electric shaver
US20160183978A1 (en) * 2014-09-19 2016-06-30 Chibuzo Aniemena Callous, dead, dry or hard skin remover
CN112088075A (zh) * 2018-05-01 2020-12-15 皇家飞利浦有限公司 剃刮单元和剃刮器具

Also Published As

Publication number Publication date
FR2203306A5 (xx) 1974-05-10
IT994220B (it) 1975-10-20
DE2342677C2 (de) 1982-01-14
DE2342677A1 (de) 1974-04-04
GB1437445A (en) 1976-05-26

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