US3710442A - Dry shaving apparatus - Google Patents

Dry shaving apparatus Download PDF

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Publication number
US3710442A
US3710442A US00094428A US3710442DA US3710442A US 3710442 A US3710442 A US 3710442A US 00094428 A US00094428 A US 00094428A US 3710442D A US3710442D A US 3710442DA US 3710442 A US3710442 A US 3710442A
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US
United States
Prior art keywords
cutter
carrier
upper cutter
guide
cutting
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
US00094428A
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English (en)
Inventor
G Meyer
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.)
Individual
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Individual
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Publication date
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Publication of US3710442A publication Critical patent/US3710442A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • 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
    • B26B19/14—Clippers or shavers operating with a plurality of cutting edges, e.g. hair clippers, dry shavers of the rotary-cutter type; Cutting heads therefor; Cutters therefor
    • B26B19/141—Details of inner cutters having their axes of rotation perpendicular to the cutting surface

Definitions

  • the invention relates to dry shaving apparatus comprising an upper cutter, a rotary cutter carrier, and a plurality of hook-shaped lower cutters supported by the carrier and cooperating with the upper cutter, the carrier including a straight guide for each of the lower cutters, and each of the lower cutters consisting of two parts, namely a first part carrying a cutting edge cooperating with the upper cutter and a second part movable in the respective guide.
  • a dry shaving apparatus constructed according to the invention has each guide and lower cutter so disposed and proportioned that the longitudinal direction of each guide makes, with the tangent drawn at the instantaneous point of contact of the lower cutter edge with the upper cutter to the path swept out by the cutting edge along the upper cutter, an angle, enclosing the cutting edge, of between and 65, whereby the pressing of each lower cutter on the upper cutter during shaving chiefly occurs through a component of the cutting forces which arise during cutting of the hairs.
  • a particularly good use of the cutting forces to press the lower cutter edges on the upper cutter is obtained if the ratio of the length of the portionof each second part engaged by the respective guide,to the length of the portion of the second partextending beyond the guide in the longitudinal direction of the latter and reckoned as far as the projection of the cutting edge onto this longitudinal direction, lies in the range between 0.5 and 5.
  • springs with slight force act between the carrier and the lower cutters and serve for engaging the lower cutters lightly against the upper cutter in the rest condition or during idle running of the apparatus, so that the lower cutters are held continuously in gentle contact with the upper cutter, and thus are always ready for operation.
  • the forces exerted in this way lie far below those which are necessary to provide the necessary pressing force for the lower cutters on the upper cutter during cutting of the hairs, so that the friction produced thereby can practically be neglected.
  • FIG. 1 shows in cross section along the line I --l in FIG. 2;
  • FIG. 2 in plan and partly in section, the part relevant to the invention of a first example, in which the lower cutters cooperate with a circular fixed perforated cutter as upper cutter,
  • FIG. 3 is a schematic sketch which serves to illustrate the general inventive concept
  • FIG. 4 shows in cross section the part relevant to the invention of asecond example, in which the lower cutters cooperate with an upper cutter formed as a lightly bowed cutter foil; in connection with this example,
  • FIG. 5 shows the cutter carrier in plan
  • FIG. 6 shows a lower cutter in perspective
  • I FIG. 7 shows in cross section a detail of the bearing of a lower cutter in the cutter carrier
  • FIG. 8 shows a variant for the construction of the lower cutters
  • FIG. 9 a third example is shown schematically, in which the lower cutters cooperate with an upper cutter formed as a cutter foil extending in a bowed shape.
  • FIG. 1 the housing of a dry shaving apparatus is indicated at l, on which an upper cutter 3 is fixed by means of a ring 2.
  • This upper cutter is made circular and has on its upper side 4 hair entry openings 5 to form a perforated cutter.
  • lower cutters 6 which are arranged movably in a disc-shaped cutter carrier 7.
  • the cutter carrier fits on a shaft 8, which is driven in the direction of the arrow 9 by a motor of the apparatus, which is not shown further.
  • Each lower cutter is formed hook-shaped,'and a first I part 10 carries a cutting edge 11 at its free end, while a second part 12, at an angle to this first part, serves for mounting the lower cutter in the cutter carrier 7.
  • each guide 13 makes, with the tangent l8 drawn at the instantaneous point of contact of the lower cutter edge with the upper cutter to the path of the cutting edge 11 along the upper cutter 3, an angled), enclosing the cutting edge, which lies between 10 and 65.
  • the cutting forces cease, so that the lower cutters are no more pressed by cutting forces against the upper cutter, so that the resultant friction between the lower cutters and the upper cutter ceases and an undesired heating is avoided.
  • the springs 16 already referred to are provided. These springs 16 have however only slight force, preferably in the order of magnitude of 10 pond (l0 gram-weight), so that the pressing forces produced by them are so slight that the friction arising from these pressing forces between the lower cutters and the upper cutter is practically negligible.
  • FIG. 3 With reference to FIG. 3, the inventive concept will be further explained.
  • a curved upper cutter 3 with which cooperates a hookshaped lower cutter 6.
  • the upper cutter is to be considered as a surface of rotation, while the lower cutter rotates about the axis of rotation.
  • the hook part 12 of the lower cutter is movable in the longitudinal direction 17 in a straight guide, which here consists of two bearings 20, in a cutter carrier which is not shown in more detail.
  • the tangent to the path of the cutting edge 1 1 along the upper cutter is further shown at 18.
  • angle 4 enclosing the cutter edge, between the longitudinal direction 17 and the tangent 18, which according to the invention should lie in the range between 10 and 65, because otherwise the lower cutter will extend so steeply or so flatly in relation to the upper cutter, that the pressing effect according to the invention will no longer be achieved. If the lower cutter 6 progresses in the direction of the arrow 9, then upon cutting of hairs a cutting force arises in the direction of the arrow 19, which has a force component 21 in the longitudinal direction 17 of the guide, which, as already explained, tends to press the lower cutter 6 with its cutting edge 11 against the upper cutter 3.
  • the ratio of the length of the portion of the hook part 12 engaged by the guide, to the length of the portion of this part extending beyond the guide in the longitudinal direction of the latter and reckoned as far as the projection of the cutting edge onto this longitudinal direction lies in the range between 0.5 and 5.
  • the portion of the hook part 12 engaged by the guide is marked a; in general under this heading should be understood that portion which corresponds to the two outermost ends of the entire straight guide, regardless of how many guiding places this has.
  • the portion which extends beyond the guide 20 in the longitudinal direction 17 of the latter as far as the projection of the cutting edge 11 upon this longitudinal direction is marked b in FIG. 3.
  • a perforated cutter foil is used as the upper cutter 3', which is tensioned with its edge in a ring 23, which can be screwed onto the housing 1" of the apparatus. With its central part, this perforated cutter foil engages on the free end of an axle 24 fixed in the apparatus, on which a cutter carrier 7' for the lower cutters 6' is freely rotatably arranged.
  • the cutter carrier For drive of the cutter carrier, the latter is connected with a toothed wheel 25, which cooperates with another toothed wheel 26, which is connected to a motor not further shown.
  • the cutter carrier 7 shown in plan in FIG. 5 has two groups of slits, 27 and 28 respectively, offset radially from one another, in which the hook-shaped lower cutters 6, shown in FIG. 6, can be inserted.
  • the two groups of slits are in this connection so arranged that the paths of both cutter groups overlap, so that the individual lower cutters can be made narrower, while nevertheless a large area of the upper cutter can be uniformly covered by them.
  • the slits 27, 28 are arranged at an angle (15, which lies between 10 and 65,
  • a central bore 29 in the slits serves to receive a weak spring 16, which abuts on the one hand against the end of the bore and on the other hand against the end faces 30 of two recesses 31 formed in the lower cutter 6. These springs urge engagement of the lower cutters on the perforated cutter foil, so that the lower cutters are always ready for operation. If desired, means can also be provided, by which the lower cutters cannot be expelled from the slits unintentionally, when the perforated cutter foil is removed from the apparatus.
  • FIG. 8 shows another constructional form of a lower cutter 6' for such an apparatus, in which the hook form is simply obtained, in that, in order to form the cutting edge 1 1', a hollow groove 32 is ground in a cutter plate
  • a perforated cutter .foil which is cylindrically curved and engaged in the neighborhood of its longitudinal edges on parts of the apparatus 1".
  • the hook-shaped lower cutter 6" are here arranged along the circumference of a drum-shaped cutter carrier 7", which is rotatably supported in the apparatus and driven by a motor.
  • Obliquely extending slits 34 are provided in the cutter carrier, which serve as guides for the respective parts 12" of the lower cutters, while the longitudinal directions 17" of the latter enclose theangle d) with the tangent 18" at the point of contact of the cutting edge 11" of the lower cutter with the perforated cutter foil.
  • a dry shaving apparatus including an upper cutter, a rotary cutter carrier, and means for rotating said carrier, the improvement in combination therewith comprising a plurality of hook-shaped lower cutters supported by the carrier and cooperating with the upper cutter, the carrier having a straight guide for each of the lower cutters, and each of the lower cutters having a first part carrying a cutting edge cooperating with the upper cutter and a second part movable in one of said guides, each of said guides: restricting the lower cutter movement to substantially linear movement, each guide and lower cutter being so disposed and proportioned that the longitudinal axis of each guide makes an angle of between 10 and 65 with the tangent drawn to the upper cutter at the instantaneous point of contact of the lower cutter cutting edge with the upper cutter on the path swept by the cutting edge along the upper cutter, whereby each lower cutter is urged against the upper cutter during shaving chiefly through a component of the cutting forces which arises during cutting of the hairs.
  • a dry shaving apparatus wherein there is a ratio in the range of 0.5 to 5 of the length of the portion of each second part engaged by the respective guide, to the length of the portion of the second part extending beyond the guide in the longitudinal direction of the latter extending to the projection of the cutting edge onto this longitudinal direction.
  • a dry shaving apparatus according to claim 1 further comprising springs with slight force, each of which acts between the carrier and a lower cutter and serves for urging the lower cutter slightly against the upper cutter in the rest condition and during idle running of the apparatus.
  • a dry shaving apparatus including an upper cutter, a rotary cutter carrier, and means for rotating said carrier, the improvement in combination therewith comprising a plurality of hook-shaped lower cutters supported by the carrier and cooperating with the upper cutter, the carrier having a straight guide for each of the lower cutters, and each of the lower cutters having a first part carrying a cutting edge cooperating with the upper cutter and a second part movable in one of said guides, each guide and lower cutter being disposed and proportioned such that the longitudinal axis of each guide makes an angle of between 10 and 65 with a tangent drawn to the upper cutter at the contact point thereon by said lower cutter cutting edge, whereby each lower cutter is urged against the upper cutter during shaving chiefly through a component of the cutting forces which arises during cutting hairs, the apparatus further comprising at least one spring acting between the carrier and each lower cutter and urging said lower cutter slightly against the upper cutter.

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Forests & Forestry (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Dry Shavers And Clippers (AREA)
  • Scissors And Nippers (AREA)
US00094428A 1969-12-05 1970-12-02 Dry shaving apparatus Expired - Lifetime US3710442A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
AT1139969A AT296078B (de) 1969-12-05 1969-12-05 Trockenrasiergerät

Publications (1)

Publication Number Publication Date
US3710442A true US3710442A (en) 1973-01-16

Family

ID=3628488

Family Applications (1)

Application Number Title Priority Date Filing Date
US00094428A Expired - Lifetime US3710442A (en) 1969-12-05 1970-12-02 Dry shaving apparatus

Country Status (12)

Country Link
US (1) US3710442A (ja)
JP (1) JPS4841661B1 (ja)
AT (1) AT296078B (ja)
BE (1) BE759429A (ja)
CA (1) CA918900A (ja)
CH (1) CH515102A (ja)
DE (1) DE2059499A1 (ja)
ES (1) ES192429Y (ja)
FR (1) FR2090458A5 (ja)
GB (1) GB1326918A (ja)
NL (1) NL7017703A (ja)
SE (1) SE363476B (ja)

Cited By (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3890709A (en) * 1973-01-12 1975-06-24 Philips Corp Rotatable cutter head for an electric dry shaver
US4275497A (en) * 1978-09-21 1981-06-30 U.S. Philips Corporation Shaving apparatus
US4283849A (en) * 1978-09-21 1981-08-18 U.S. Philips Corporation Cutting unit for a dry-shaving apparatus
US4329781A (en) * 1978-12-07 1982-05-18 U.S. Philips Corporation Shaving apparatus having a shear plate with hair-entry apertures and a cutting unit with lead cutters, which unit is drivable relative to the shear plate
EP0228128A1 (en) * 1985-12-20 1987-07-08 Koninklijke Philips Electronics N.V. Dry-shaving apparatus
EP0246367A2 (en) * 1986-05-22 1987-11-25 Koninklijke Philips Electronics N.V. Dry shaving apparatus
EP0285191A1 (en) * 1987-03-04 1988-10-05 Koninklijke Philips Electronics N.V. Shaving apparatus
US4811484A (en) * 1985-12-20 1989-03-14 U.S. Philips Corp. Dry-shaving apparatus
US5035053A (en) * 1988-09-19 1991-07-30 U.S. Philips Corp. Shaving apparatus
US5408749A (en) * 1993-02-12 1995-04-25 Izumi Products Company Electric razor
US6158125A (en) * 1999-02-22 2000-12-12 Dolev; Moshe Cutter assemblies for electric shavers
EP1747858A2 (en) * 2005-07-26 2007-01-31 Matsushita Electric Works, Ltd. Nose hair cutter
EP1884331A1 (en) * 2006-08-04 2008-02-06 Izumi Products Company Inner cutter for a rotary shaver and a rotary shaver using the same
US20100299929A1 (en) * 2009-05-28 2010-12-02 Tae-Jun Oh Insert Type Blade Assembly of Rotation Drum Type Electric Razor
US20110173816A1 (en) * 2010-01-18 2011-07-21 Tsafrir Ben-Ari Motorized shaving apparatus head and shaving apparatus implementing the same
US20120000075A1 (en) * 2010-01-18 2012-01-05 Tsafrir Ben-Ari Motorized shaving apparatus head and shaving apparatus implementing the same
EP2602071A1 (en) * 2011-12-09 2013-06-12 Rovcal, Inc. Inner cutter for rotary shaver
US20170057103A1 (en) * 2014-02-18 2017-03-02 Hybrid Razor Ltd Shaving apparatus
US10195752B2 (en) 2013-05-17 2019-02-05 Hybrid Razor Ltd Shaving apparatus
US10456935B2 (en) 2010-01-18 2019-10-29 Hybrid Razor Ltd Shaving apparatus and shaving apparatus head
US11272772B2 (en) 2016-05-16 2022-03-15 Spectrum Brands, Inc. Heated hair setter apparatus and method

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3794045A (en) * 1971-12-06 1974-02-26 American Optical Corp Passive hysteresis circuit demand pacer
DE2342677C2 (de) * 1972-09-13 1982-01-14 Matsushita Electric Works Ltd., Kadoma, Osaka Scherkammfolie für den Scherkopf eines elektrischen Trockenrasiergerätes
JPS50156460U (ja) * 1974-06-13 1975-12-25
JPS5234761U (ja) * 1975-09-02 1977-03-11
ES2067411B1 (es) * 1993-06-18 1995-11-01 Asturiana De Zinc Sa Catodo para la deposicion electrolitica de metales ferreos.

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2280836A (en) * 1940-03-04 1942-04-28 Eleanor U Andrews Blade support for shaving devices
US2289323A (en) * 1939-02-13 1942-07-07 Lawrence E Dettle Electric shaver
US2331500A (en) * 1939-02-18 1943-10-12 Remington Rand Inc Mechanical razor

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2289323A (en) * 1939-02-13 1942-07-07 Lawrence E Dettle Electric shaver
US2331500A (en) * 1939-02-18 1943-10-12 Remington Rand Inc Mechanical razor
US2280836A (en) * 1940-03-04 1942-04-28 Eleanor U Andrews Blade support for shaving devices

Cited By (31)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3890709A (en) * 1973-01-12 1975-06-24 Philips Corp Rotatable cutter head for an electric dry shaver
US4275497A (en) * 1978-09-21 1981-06-30 U.S. Philips Corporation Shaving apparatus
US4283849A (en) * 1978-09-21 1981-08-18 U.S. Philips Corporation Cutting unit for a dry-shaving apparatus
US4329781A (en) * 1978-12-07 1982-05-18 U.S. Philips Corporation Shaving apparatus having a shear plate with hair-entry apertures and a cutting unit with lead cutters, which unit is drivable relative to the shear plate
EP0228128A1 (en) * 1985-12-20 1987-07-08 Koninklijke Philips Electronics N.V. Dry-shaving apparatus
US4811484A (en) * 1985-12-20 1989-03-14 U.S. Philips Corp. Dry-shaving apparatus
EP0246367A2 (en) * 1986-05-22 1987-11-25 Koninklijke Philips Electronics N.V. Dry shaving apparatus
EP0246367A3 (en) * 1986-05-22 1989-02-22 Koninklijke Philips Electronics N.V. Dry shaving apparatus
EP0285191A1 (en) * 1987-03-04 1988-10-05 Koninklijke Philips Electronics N.V. Shaving apparatus
US5035053A (en) * 1988-09-19 1991-07-30 U.S. Philips Corp. Shaving apparatus
US5408749A (en) * 1993-02-12 1995-04-25 Izumi Products Company Electric razor
US6158125A (en) * 1999-02-22 2000-12-12 Dolev; Moshe Cutter assemblies for electric shavers
EP1747858A3 (en) * 2005-07-26 2007-03-07 Matsushita Electric Works, Ltd. Nose hair cutter
US20070022605A1 (en) * 2005-07-26 2007-02-01 Matsushita Electric Works, Ltd. Nose hair cutter
EP1747858A2 (en) * 2005-07-26 2007-01-31 Matsushita Electric Works, Ltd. Nose hair cutter
US7401406B2 (en) * 2005-07-26 2008-07-22 Matsushita Electric Works, Ltd. Nose hair cutter
EP1884331A1 (en) * 2006-08-04 2008-02-06 Izumi Products Company Inner cutter for a rotary shaver and a rotary shaver using the same
US20080028618A1 (en) * 2006-08-04 2008-02-07 Izumi Products Company Inner cutter for a rotary shaver and a rotary shaver using the same
US8434233B2 (en) * 2006-08-04 2013-05-07 Izumi Products Company Inner cutter for a rotary shaver and a rotary shaver using the same
US20100299929A1 (en) * 2009-05-28 2010-12-02 Tae-Jun Oh Insert Type Blade Assembly of Rotation Drum Type Electric Razor
US8316546B2 (en) * 2009-05-28 2012-11-27 Tae-Jun Oh Insert type blade assembly of rotation drum type electric razor
US20120000075A1 (en) * 2010-01-18 2012-01-05 Tsafrir Ben-Ari Motorized shaving apparatus head and shaving apparatus implementing the same
US8033022B2 (en) * 2010-01-18 2011-10-11 Hybrid Razor Ltd Motorized shaving apparatus head and motorized shaving apparatus
US20110173816A1 (en) * 2010-01-18 2011-07-21 Tsafrir Ben-Ari Motorized shaving apparatus head and shaving apparatus implementing the same
US8601696B2 (en) * 2010-01-18 2013-12-10 Hybrid Razor Ltd Motorized shaving apparatus head and shaving apparatus implementing the same
US10456935B2 (en) 2010-01-18 2019-10-29 Hybrid Razor Ltd Shaving apparatus and shaving apparatus head
EP2602071A1 (en) * 2011-12-09 2013-06-12 Rovcal, Inc. Inner cutter for rotary shaver
US10195752B2 (en) 2013-05-17 2019-02-05 Hybrid Razor Ltd Shaving apparatus
US20170057103A1 (en) * 2014-02-18 2017-03-02 Hybrid Razor Ltd Shaving apparatus
US10350771B2 (en) * 2014-02-18 2019-07-16 Hybrid Razor Ltd Shaving apparatus
US11272772B2 (en) 2016-05-16 2022-03-15 Spectrum Brands, Inc. Heated hair setter apparatus and method

Also Published As

Publication number Publication date
BE759429A (fr) 1971-04-30
SE363476B (ja) 1974-01-21
CA918900A (en) 1973-01-16
ES192429Y (es) 1975-06-01
AT296078B (de) 1972-01-25
CH515102A (de) 1971-11-15
NL7017703A (ja) 1971-06-08
JPS4841661B1 (ja) 1973-12-07
GB1326918A (en) 1973-08-15
FR2090458A5 (ja) 1972-01-14
DE2059499A1 (de) 1971-06-09
ES192429U (es) 1975-01-16

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