US3802073A - Dryshaver construction and operation - Google Patents

Dryshaver construction and operation Download PDF

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Publication number
US3802073A
US3802073A US17996871A US3802073A US 3802073 A US3802073 A US 3802073A US 17996871 A US17996871 A US 17996871A US 3802073 A US3802073 A US 3802073A
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US
United States
Prior art keywords
shear
dryshaver
elements
abutment
biasing
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
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English (en)
Inventor
A Braun
F Schreiber
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Braun GmbH
Original Assignee
Braun GmbH
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Filing date
Publication date
Application filed by Braun GmbH filed Critical Braun GmbH
Application granted granted Critical
Publication of US3802073A publication Critical patent/US3802073A/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
    • B26B19/3853—Housing or handle
    • 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
    • B26B19/16—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 involving a knife cylinder or a knife cone or separate cutting elements moved like a rotating cylinder or a rotating cone
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T83/00—Cutting
    • Y10T83/04—Processes

Definitions

  • electrically operated dryshavers utilize an outer shear foil which is apertured and which is usually arcuately curved, and an inner shear element which presses against the inner side of the outer shear foil and is moved with reference thereto, either linearly or in rotation.
  • the inner element usually is in form of a block or member provided with a plurality of cutting edges which are in contact with the inner side of the shear foil, with the block being pressed against the inner side of the shear foil and being linearly reciprocated.
  • Another construction utilizes a more or less cylindrical or part-cylindrical element which is tumably or pivotally mounted in the housing of the shaver and pressed against the semi-cylindrically curvedshear foil. Either rotational motors or oscillating-armature motors are utilized.
  • shear foil is essentially of planar configuration and relatively rigid, and a plurality of cutter blades are located at the inner side of the shear foil and are pressed by springs against the latter when the cutter element of the shear system is rotated.
  • Another object of the invention is to provide a method of operating an electrically driven dryshaver.
  • an electrically driven dryshaver having a shear system which comprises an outer shear element, an inner shear element for cutting off beard stubble in cooperation with the outer shear element, with at least one of these elements being driven for movement with reference to the other, and biasing means which biases the shear elements into abutment with one another with a force in excess of 4 kg/cm
  • motors having between substantially 2,000 and 2,500 RPM, although these are not binding values. If the motor is of the polarized oscillating-armature type, an operating frequency of substantially 3,000-3,600 cycles is advantageous, meaning that the driven shear component will move between 3,000 and 3,600 times over the juxtaposed surface of the stationary shear system component.
  • the invention is suitable with all currently known types of dryshaver, but it is especially advantageous when used with the type of dryshaver having an apertured shear foil because in this type of construction there is more of a tendency for the shear foil components to move out of engagement with one another and such movement will result in a more marked deterioration of the shear effectiveness than in other types.
  • the invention also contemplates to make the pressure at which the shear foil components are pressed against one another variable.
  • an additional spring can be provided which can be used to add to or subtract from the contact pressure as desired.
  • a dryshaver is provided with a separate long-hair trimmer, that is in addition to the main cutter which is a cutter for the beard stubble, then it is customary in the art to drive the movable component of the long-hair trimmer with the same frequency as the movable component of the shear system, that is at high freuquency.
  • the present invention suggests that the movable component of such a long-hair trimmer be driven at a lower frequency, by interposing an additional stepdown drive. It has been found particularly advantageous if the movable component of the long-hair trimmer is driven at a frequency of less than 1,000 up to approximately l,500.
  • the long-hair trimmer according to the presentinvention can also bev subjected to'the increased contact pressure mentioned before, so that long hair can also be cut much more effectively than heretofore.
  • the lower force requirements for operatingsuch a long-hair trimmer make it possible to include it for the first time economically and reasonably in battery-operated dryshavers, where heretofore the utilization of long-hair trimmers resulted in a substantial and rapid draining of the battery charge.
  • FIG. 1 is a somewhat diagrammatic section illustrating a shear-foil type dryshaver with a linearly recipro- DESCRIPTION OF THE PREFERRED EMBODIMENTS
  • reference numeral 1 identifies an electromotorwhich may be of any known type utilized heretofore in the art.
  • Reference numeral 2 identifies a stepdown drive which is composed of a gear and a gear 21 in the illustrated embodiment, it being understood that such a step-down drive could also be composed of more than two components.
  • the step-down drive acts via a shaft 22 on the eccentric 30 of a rod 3 which in turn acts upon an arm 41 of the angular lever 4 which is journalled at 40.
  • the other arm 42 of the lever 4 engages in known manner the movable cutting member 5, that is the movable component of.v the shear system, which is composed of a plurality of blade portions 50 whose free circumferential edges are approximately of semi-circular contour.
  • the stationary component of the shear system is an apertured shear foil 51 which is connected rigidly or movably to the housing so that it surrounds these portions 50 approximately semicylindrically.
  • springs 6, 60 and 6l which press the member 5 against the inner side of this outer shear component
  • theentire contact pressure can be supplied by a single spring, and the spring characteristic of such a member could be varied, for instance via a lever such as the lever 62, so that depending upon its length. it will supply a contact pressure ranging between substantially 5 and 15 kg/cm
  • the composed of the components 711 and 72 which, as
  • step-down drive 2 comprises an additional pair of gears 23 and 24, and
  • the eccentric 80 is connected via shaft 25 with the rod 8, which in turn is connected with the arm 91 of a lever which is journalled at 90.
  • the other arm 92 of the lever is connected with the movable component 72 of the long-hair trimmer 7.
  • the movable component 72 is driven at a frequency of below 1,000 up to approximately 1,500.
  • FIG.'3 there is illustrated a somewhat modified embodiment analogous to that of FIG. 1-, in which the inner movable shear system component is constructed as a rotary element 52. It has inclined blades 53, but in place of these it would also be possible to provide helical or axially parallel straight blades and cutting edges, which themselves are known per se.
  • springs 63 and 64 are provided which draw the shear foil 51 over the member 52, in order to obtain the necessary contact pressure between them.
  • the springs could also be connected with the journals 54 and 55 of the member 52 in order to press the latter with the required contact pressure against the inner side of the shear foil 51, and this is illustrated by way of example with respect to the journal 54 and the spring 65.
  • combinations of the arrangements of the springs 63, 64 and 65 can also bev provided.
  • the contact pressure which again should be I at least 5 kg/cm and preferably, no more than approximately 15 kg/cm is obtained by appropriate dimensioning of the springs or spring combinations.
  • the motor 1 drives the member 52 via the modified step-down drive 2, and the gears 26, 27 and 28 in order to reduce the RPM of the motor to the desired lower RPM which are to be imparted to the member 52.
  • a shear system comprising an outer shear element, and an inner shear element for cutting beard stubble in cooperation with said outer shear element; biasing means biasing said shear elements into abutment with one another at a contact pressure between substantially 4 and 2O kg/cm and means for moving said shear elements relative to one another while said shear elements are in abutment at said contact pressure, said moving means including an electric motor, and a step-down gear train connected with said motor and one of said shear elements and being always operative for converting the rotation of said motor into at most about 2,500 movements per minute of said one shear element relative to the other shear element when said motor is activated.
  • biasing means biases said elements into abutment with a pressure in excess of 7 kg/cm 3. In a dryshaver as defined in claim 1, wherein said biasing means biases said elements into abutment with a pressure of 10 kglcm 4. In a dryshaver as defined in claim 1, wherein said biasing means biases said elements into abutment with a pressure in excess of 15 kg/cm but smaller than 20 kg/cm 5. In a dryshaver as defined in claim 1; and further comprising control means for varying said pressure at the will of an operator.
  • said biasing means comprising a plurality of springs and further comprising control means for adjusting the pretension of at least one of said springs to thereby vary said biasing force.
  • said biasing means comprising a plurality of biasing springs acting upon and pressing one of said elements into abutment with the other; at least one additional spring; and control means for selectively adding the pressure exerted by said additional spring to said biasing force.
  • said outer shear element being a perforate shear foil
  • said inner shear element being a cutter block having a plurality of cutting edges in abutment with one side of said shear foil, said inner shear element being mounted for linear reciprocatory movement with reference to said outer shear element; and wherein said biasing means comprises biasing springs.
  • said outer shear element being a perforate shear foil and said inner shear element being a movably mounted cutter member provided with a cutting edge in abutment with one side of said shear foil; and wherein said biasing means comprises biasing springs.

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Forests & Forestry (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Dry Shavers And Clippers (AREA)
US17996871 1970-09-14 1971-09-13 Dryshaver construction and operation Expired - Lifetime US3802073A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
LU61683 1970-09-14

Publications (1)

Publication Number Publication Date
US3802073A true US3802073A (en) 1974-04-09

Family

ID=19726484

Family Applications (2)

Application Number Title Priority Date Filing Date
US17996871 Expired - Lifetime US3802073A (en) 1970-09-14 1971-09-13 Dryshaver construction and operation
US3768348D Expired - Lifetime US3768348A (en) 1970-09-14 1973-02-15 Dryshaver operation

Family Applications After (1)

Application Number Title Priority Date Filing Date
US3768348D Expired - Lifetime US3768348A (en) 1970-09-14 1973-02-15 Dryshaver operation

Country Status (16)

Country Link
US (2) US3802073A (fr)
AT (1) AT317040B (fr)
AU (1) AU3337071A (fr)
BE (1) BE772290A (fr)
BR (1) BR7105867D0 (fr)
CA (1) CA953898A (fr)
CH (1) CH538335A (fr)
DE (1) DE2139419A1 (fr)
FR (1) FR2107383A5 (fr)
GB (1) GB1356824A (fr)
IL (1) IL37670A (fr)
IT (1) IT940349B (fr)
NL (1) NL7112300A (fr)
SE (1) SE363131B (fr)
TR (1) TR17271A (fr)
ZA (1) ZA715947B (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3949469A (en) * 1973-02-16 1976-04-13 Braun Aktiengesellschaft Electric shaver comprising a rotatable cylindrical shearing foil
US20070169350A1 (en) * 2006-01-23 2007-07-26 Tae-Jun Oh High speed link type reciprocating electric shaver
US7251896B2 (en) 2004-09-14 2007-08-07 Ideavillage Products Corp. Hair clipper with pivot head
USD1013957S1 (en) 2021-04-05 2024-02-06 Church & Dwight Co., Inc. Angled shaver

Families Citing this family (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2548572B1 (fr) * 1983-07-04 1988-03-18 Novation Indle Ste Civile Et Rasoir electrique
DE3340661C2 (de) * 1983-11-10 1991-03-07 Philips Patentverwaltung Gmbh, 2000 Hamburg Scherkopf für einen Trockenrasierapparat mit einer gekrümmt eingespannten Scherfolie
DE3346656C1 (de) * 1983-12-23 1988-12-22 Braun Ag, 6000 Frankfurt Vorrichtung zur Umwandlung der Drehbewegung eines Exzenters in eine hin- und hergehende Bewegung
GB9614160D0 (en) * 1996-07-05 1996-09-04 Gillette Co Dry shaving apparatus
JP2004254757A (ja) * 2003-02-24 2004-09-16 Izumi Products Co 往復動式電気かみそり
GB2425277B (en) * 2005-02-11 2009-12-02 Gillette Co Electric razor assembly
US9283685B2 (en) * 2012-07-26 2016-03-15 Shavelogic, Inc. Pivoting razors
WO2014051842A1 (fr) 2012-09-27 2014-04-03 Shavelogic, Inc. Systèmes de rasage
US9486930B2 (en) * 2012-09-27 2016-11-08 Shavelogic, Inc. Shaving systems
WO2014051843A1 (fr) 2012-09-28 2014-04-03 Shavelogic, Inc. Systèmes de rasage
US9623575B2 (en) 2012-12-18 2017-04-18 Shavelogic, Inc. Shaving systems
US20150158192A1 (en) 2013-12-09 2015-06-11 Shavelogic, Inc. Multi-material pivot return for shaving systems
US11325270B2 (en) 2014-03-21 2022-05-10 Sl Ip Company Llc Metal spring return and method
DE102017003965B4 (de) 2017-04-25 2019-12-12 Zapp Precision Metals Gmbh Martensitischer Chromstahl, Stahlfolie, perforierte und/oder gelochte Komponente aus einer Stahlfolie, Verfahren zum Herstellen einer Stahlfolie

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1806116A (en) * 1930-04-22 1931-05-19 Logan S Peterson Hedge trimmer
CH276797A (fr) * 1948-10-20 1951-07-31 Ryser Jean Rasoir mécanique du genre tondeuse.
US2822610A (en) * 1951-05-16 1958-02-11 Jacob L Kleinman Shaving implement having a frictional motor compartment cover
US3521093A (en) * 1968-07-26 1970-07-21 Braun Ag Oscillating motor driving arrangement

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1806116A (en) * 1930-04-22 1931-05-19 Logan S Peterson Hedge trimmer
CH276797A (fr) * 1948-10-20 1951-07-31 Ryser Jean Rasoir mécanique du genre tondeuse.
US2822610A (en) * 1951-05-16 1958-02-11 Jacob L Kleinman Shaving implement having a frictional motor compartment cover
US3521093A (en) * 1968-07-26 1970-07-21 Braun Ag Oscillating motor driving arrangement

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3949469A (en) * 1973-02-16 1976-04-13 Braun Aktiengesellschaft Electric shaver comprising a rotatable cylindrical shearing foil
US7251896B2 (en) 2004-09-14 2007-08-07 Ideavillage Products Corp. Hair clipper with pivot head
US20070169350A1 (en) * 2006-01-23 2007-07-26 Tae-Jun Oh High speed link type reciprocating electric shaver
US7698820B2 (en) * 2006-01-23 2010-04-20 Tae-Jun Oh High speed link type reciprocating electric shaver
USD1013957S1 (en) 2021-04-05 2024-02-06 Church & Dwight Co., Inc. Angled shaver

Also Published As

Publication number Publication date
NL7112300A (fr) 1972-03-16
BR7105867D0 (pt) 1973-05-10
BE772290A (fr) 1972-01-17
CA953898A (en) 1974-09-03
SE363131B (fr) 1974-01-07
FR2107383A5 (fr) 1972-05-05
IL37670A0 (en) 1971-11-29
DE2139419A1 (de) 1972-03-23
CH538335A (de) 1973-06-30
IL37670A (en) 1974-07-31
GB1356824A (en) 1974-06-19
TR17271A (tr) 1975-03-24
AU3337071A (en) 1973-03-22
IT940349B (it) 1973-02-10
US3768348A (en) 1973-10-30
ZA715947B (en) 1972-05-31
AT317040B (de) 1974-08-12

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