US3844034A - Dry shaver - Google Patents

Dry shaver Download PDF

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Publication number
US3844034A
US3844034A US00326863A US32686373A US3844034A US 3844034 A US3844034 A US 3844034A US 00326863 A US00326863 A US 00326863A US 32686373 A US32686373 A US 32686373A US 3844034 A US3844034 A US 3844034A
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US
United States
Prior art keywords
unit
carriers
cutter
combination
holder
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
US00326863A
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English (en)
Inventor
K Limberg
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.)
Robert Krups GmbH and Co KG
Original Assignee
Robert Krups GmbH and Co KG
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
Application filed by Robert Krups GmbH and Co KG filed Critical Robert Krups GmbH and Co KG
Application granted granted Critical
Publication of US3844034A publication Critical patent/US3844034A/en
Assigned to ROBERT KRUPS STIFTUNG & CO., KG reassignment ROBERT KRUPS STIFTUNG & CO., KG CHANGE OF NAME (SEE DOCUMENT FOR DETAILS). EFFECTIVE 1-19-81 Assignors: ROBERT KRUPS
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
    • B26B19/28—Drive layout for hair clippers or dry shavers, e.g. providing for electromotive drive
    • B26B19/282—Motors without a rotating central drive shaft, e.g. linear motors
    • 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
    • B26B19/28—Drive layout for hair clippers or dry shavers, e.g. providing for electromotive drive
    • B26B19/282—Motors without a rotating central drive shaft, e.g. linear motors
    • B26B19/284—Motors without a rotating central drive shaft, e.g. linear motors with an actuator oscillating about a pivot axis

Definitions

  • ABSTRACT A shear foil is mounted on a housing and located within the latter is a vibratory system including a cutter unit reciprocable beneath and relative to the shear foil, an electrically energized drive including a vibratory armature and a connection from the same to the cutter unit.
  • the vibratory system has an inherent vibratory frequency.
  • An arrangement is provided for accommodating this inherent vibratory frequency to the frequency of the electric current with which the drive is energized.
  • FIG SHEET 2 [IF 2 lllll DRY SHAVER I BACKGROUND OF THE INVENTION
  • the present invention relates to a dry shaver in general, and more particularly to an electrically operated dry shaver. Still more particularly the invention relates to an electrically operated dry shaver having an arrangement for accommodating the inherent vibratory frequency of its vibratory system to the frequency of the electric current by which the drive is energized, the purpose being to obtain optimum operating conditions even if the dry shaver is to be used with current of different frequencies or cycles. This is done by providing components which are connected with or disconnected from the vibratory system to thereby change the mass of the same and thereby accommodate its inherent vibratory frequency to the frequency of the electric current.
  • a dry shaver having a housing, a shear foil in the'housing, a vibratory system provided in the housing and including a cutter unit reciprocable beneath and relative to the shear foil, an electrically energized drive including a vibratory armature, and springs connecting the armature and cutter unit and being flexible in direction of reciprocation of the latter having an inherent vibratory frequency.
  • Means is provided for accommodating the inherent vibratory frequency to the 2 frequency of the electric current by which the drive is energized by varying the mass of the cutter unit.
  • the cutter unit In dry shavers the cutter unit is invariably readily accessible, being located directly beneath the shear foil and becoming quite rapidly clogged with cut-off beard stubble. To be able to remove this beard stubble the cutter unit must of course be accessible. This is accomplished by removably mounting the shear foil in the housing, usually in a separate head portion carrying the shear foil and which can be removably connected with the housing itself.
  • the cutter unit is readily accessible and, since the present invention proposes to ac commodate the inherent vibratory frequency of the vibratory system to the frequency of the electric current by varying the mass of the cutter unit, this presents no problem when the latter is readily accessible. This, in turn, means that the necessary adjustments can be made in a very simple manner without requiring any technical knowledge or expertise, and by the user himself.
  • the mass of the cutter unit may be either increased or decreased, depending upon the particular requirements of a given situation.
  • the cutter unit which has a pluralityof cutter blades and carriers for the same, is provided with mass-varying components which can be connected with and disconnected from the cutter unit, ad-
  • the mass of the cutter unit may be accommodated to the highest frequency of electric current by which the dry shaver is to operate, and may be varied so as to accommodate it to a lower current frequency by adding the mass-varying components to the cutter unit.
  • the holder has two spaced end walls provided with recesses which can be clampingly engaged carriers of the cutter unit when the end walls are introduced between respective pairs of spaced cutter blades of the cutter unit. This eliminates separate connecting means which otherwise would have to be provided for the purpose of connecting the holder to the cutter unit, and it is now merely possible to push the holder from below onto the cutter unit until it couples with the same.
  • the holder itself is of a synthetic plastic mate rial having at least some resiliency so that it can yield when it is pushed onto or pulled off the cutter unit.
  • Nylon could be such a material, and of course many others are known in the art.
  • the carriers for the cutter blades of the cutter unit can be made hollow, and in this case it is possible to so configurate the mass-varying components that they can be accommodated in the interior of the carriers without requiring the holder mentioned above.
  • a holder may not be usable, or mass-varying components insertable into hollow carriers of a cutter unit may not be employable.
  • the cutter units being interchangeable depending upon the mass required.
  • the cutter unit which is intended to have the lower mass be formed with cutter blade carriers which are hollow in their cross-section, whereas the cutter unit having the higher mass is formed with cutter blade carriers having a solid cross-section.
  • the former would then be used for a lower frequency of electric current and the latter would be used for a higher frequency of electric current.
  • the mounting arrangement for the cutter blades itself change from one unit to the next as long as the mass is different.
  • FIG. 1 is a partially diagrammatic vertical section through a dry shaver according to the present invention
  • FIG. 2 is a vertical section through a cutter unit of a dry shaver according to the present invention, illustrating one embodiment of the invention
  • FIG. 3 is a top-plan view of a detail of FIG. 2;
  • FIG. 4 is a section taken on line IV-lV of FIG. 3;
  • FIG. 5 is a view analogous to FIG. 2 but illustrating a further embodiment of the invention.
  • FIG. 1 in particular illustrates a dry shaver in which only those components are shown which are essential for an understanding of the invention.
  • Other components such as an ON-OFF switch and electrical connections for connecting the dry shaver to a source of electrical energy, have been omitted in order to permit a clearer illustration of the components which are necessary for an understanding of the invention.
  • the dry shaver has a housing 10 of which only one half is illustrated, the other half having been omitted to permit illustration of the interior components.
  • a vibratory armature drive 11 which is known per se to those skilled in the art, and at the upper end of the housing there is provided a shear head 12 which is releasably connected with the housing and which carries a shear foil 31 which is apertured so that beard stubble will pass through the apertures of the shear foil when the latter is placed against the skin of a user.
  • the drive 11 is mounted in a manner also known from the art in a frame 13 at the lower end of which there is provided a stator 14 which can be connected with a source of electrical energy.
  • the stator 14 has windings out of which extend pole shoes 15; arranged above the latter is a vibratory armature 16 whose pole shoes 17 can move closely adjacent and above the pole shoes 15.
  • a journal 18 is provided which pivotably journals the vibratory armature 16, and the latter is supported at both sides in the direction of movement by flex springs 19 located between the pole shoes 17 and the journal 18.
  • the armature 16 has a vibratory arm 20 extending upwardly of the journal 18 and passing through an opening 21 in the housing and through a base plate 22 of the shear head 12.
  • the element 24 comprises a sleeve 25 mounted on the arm 20 and an articulated component 26 on which the cutter unit 23 is provided and which is connected with the sleeve 25 in a semi-cardanic manner (i.e., not for universal displacement but only for displacement in two mutually opposite directions).
  • the sleeve 25 is secured to the arm 20 in the illustrated manner, projections 27 of the arm being provided which extend through interior axially extending grooves in the sleeve and which engage in operating position the upper edge thereof. In this manner the cutter unit 23 can be released together with the coupling 24 from the arm 20 at any time this is desired.
  • the element 26 is connected via portions 26' with one or more carriers 28 carrying the individual cutter blades 23' of the cutter unit 23 and this connection can also be made releasable when and if desired.
  • the element 26 also abuts with a projection 29 against a spring-loaded pressure element 30 arranged in the interior of the arm 20 as shown in FIG. 1.
  • the shear head 12 has a shear head frame 32 provided with a cut-out, and the shear foil 31 overlies the cut-out.
  • the manner in which it is connected with the shear head frame 32 is conventional in the art and requires no detailed discussion, especially inasmuch as it is not a part of the invention.
  • the frame 32 in turn can be pivoted from the operating position shown in FIG. l'about a hinge 32' away from the plate 22, so as to expose and make accessible the cutter unit 23.
  • the shear head 12 need not be pivoted to the housing in the manner just discussed but could be otherwise releasably connected with, for
  • the arm 20, the armature 16, the springs 19 and the cutter unit 23 together form a vibratory system having an inherent vibratory frequency.
  • the inherent vibratory frequency of this system is so chosen that it will be 60 cycles in normal operation that being the number of cycles at which electrical current is supplied for operation of the drive in many countries.
  • the inherent vibratory frequency of the vibratory frequency must be made variable so that it can be accommodated to the lower number of cycles. According to the present invention this is achieved by increasing the mass of the cutter unit 23 and thereby accommodating the inherent vibrator'yfrequency of the vibratory system to the SO-cycle current.
  • FIG. 2 shows an embodiment in which a holder 34 is provided, having a plurality of mass-varying components 33. These components and the holder 34 can be connected with the cutter unit 23 by placing beneath the latter the cutter unit 23 as shown in FIG. 2, and coupling it to the cutter unit 23.
  • a holder 34 having a plurality of mass-varying components 33.
  • the holder. 34 with the components 33 will be connected with the cutter unit 23 as shown in FIG. 2; conversely, if it is desired to reconvert from SO-cycle current to 60-cycle current, the holder 34 with the components 33 will be disconnected from the cutter unit 23.
  • the holder 34 in a frame-like manner and providing it'with a central opening 35 through which the coupling 24 can extend.
  • the holder 34 also has longitudinally spaced end walls 36 each of which can be inserted between two adjacent individual cutter blades 23 of the unit 23 and eachv of which is provided with a cut-out 37 (see FIG. 4) by means of which it can be secured to the center carrier 27 of the unit 23 by exerting sufficient pressure for the carrier'27 to snap into the two recesses 37.
  • the holder 34 also has a bottom wall, identified with reference numeral 38 as shown in FIG. 2. Extending from-the end walls 36 bottom wall 38 is conically depressed to the opening 35, so that the available space within the confines of the holder 34 increases towards the middle thereof, affording more room for the components 33 which, as FIG. 3 shows-most clearly, can be inserted with end portions 39 into cut-outs 40 of side walls 41 of the holder 34 and which are located at opposite sides of the opening 35.
  • the holder 34 is to be connected to or disconnected from the cutter unit 23 it is merely necessary to remove the shear head 12 with its frame 32, making the cutter unit 23 accessible. Now, the cutter unit 23 is disconnected from the arm and, if the holder 34 is to be connected with the cutter unit 23, it is placed beneath the cutter unit and is pressed onto the same until they are coupled in the manner discussed above via the recesses 37. Conversely, if the holder 34 is to be disconnected from the cutter unit 23, then it is merely necessary to pull the two apart.
  • the holder 34 is of a synthetic plastic material (for instance nylon, polyvinylchloride, or the like) which has sufficient resiliency to permit snap coupling connection or disconnection.
  • the holder 34 of FIGS. 1-4 has been omitted.
  • the cutter unit 23 is provided with holders 28 for its individual cutter blades 23', which holders 28 are hollow and tubular in configuration.
  • the mass-varying components 43 are so configurated in this embodiment that they can be received in the hollow tubular carriers 28, filling the interior thereof.
  • this omits the holder 34 which is not necessary in this embodiment and of course a changeover to accommodate the system to a different electric current frequency is effected by removing the components 43 from the interior of the carriers 28.
  • FIGS; 1-4 and 5 Another embodiment, not illustrated but clearly within the concept of the present invention, proposes that in circumstances where the possibilities of FIGS; 1-4 and 5, respectively, cannot be used or are not desired to be used, the cutter units 23 themselves may provide for a variation in the mass and thereby in the inherent vibratory frequency of the system.
  • two (or of course more) cutter units 23 could be provided of which one has a greater and the other a lesser mass.
  • the carriers 28 of the unit desired to have the greater mass could be of solid cross-section and the carriers 28 of the unit desired to have the lesser mass could be of hollow tubular cross-section as in the embodiment of FIG. 5 without, however, the separate components 43.
  • the appropriate cutter unit When the system is to be accommodated to electric currents of different frequency the appropriate cutter unit would then be chosen and con-' nected with the arm 20. Particularly in the case of the heavier cutter unit, where the carriers 28 would be of solid cross-section, the carriers together with the end walls 43 could be made of one piece, for instance in a casting procedure.
  • the discussed embodiments make it possible to obtain optimum operating results when the vibratory frequency of the system is changed to be accommodated to, the frequency or number of cycles of 50 or 60 cycles, respectively, while at the same time providing for a quadrupled mass or a reduction of the mass by three-quarters of the cutter unit. Theoretically, a usable operating efficiency of the dry shaver can be obtained if the mass of the cutter unit is doubled or halved, but this would be the lower boundary of the usable range.
  • a combination comprising a housing; a shear foil on said housing; a vibratory system in said housing and including a cutter unit comprising a plurality of cutter blades, said unit being reciprocable beneath and relative to said shear foil, an electrically energized drive including an oscillating arm connected with a lower side of said unit for effecting reciprocation of the same, and including a vibratory armature, and springs engaging said armature and being flexible in a direction of movement of the latter, said vibratory system having an inherent vibratory frequency; and means, comprising releasable elements releasably connected with said unit, to vary the combined mass thereof and thereby change the inherent vibratory frequency of said system, so as to accommodate said inherent vibratory frequency to the frequency of the electric current by which said drive is energized by varying the mass of said cutter unit.
  • said plurality of cutter blades further comprising carriers for the same; and wherein said releasable elements are connectable with and disconnectable from said carriers.
  • said means comprises at least one holder surrounding said arm and clampingly engageable with said unit.
  • said unit including a plurality of cutter blades, and carriers for the same; and wherein said holder comprises recesses arranged to frictionally receive at least one of said carriers.
  • said holder also having a pair of spaced parallel end walls and a bottom wall connecting said end walls and provided with a central opening, said bottom wall being conically tapered in direction from said end walls to said central opening; and further comprising a coupling connecting said unit with said arm and extending through said central opening.
  • said unit including a plurality of cutter blades, and hollow carriers for the same; and wherein said means comprises elements dimensioned for releasable accommodation in the interior of said carriers.
  • said means comprises at least one additional cutter unit similar to the first-mentioned unit but having a mass different from that of said first-mentioned unit and being connected in place of the same with said drive.
  • one of said cutter units comprises a plurality of cutter blades and solid cross-section carriers for the same, and wherein the other cutter unit comprises a plurality of cutter blades and hollow cross-section carriers for the same.

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  • Life Sciences & Earth Sciences (AREA)
  • Forests & Forestry (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Dry Shavers And Clippers (AREA)
US00326863A 1972-01-25 1973-01-26 Dry shaver Expired - Lifetime US3844034A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19722203346 DE2203346A1 (de) 1972-01-25 1972-01-25 Elektrisch antreibbares trockenrasiergeraet

Publications (1)

Publication Number Publication Date
US3844034A true US3844034A (en) 1974-10-29

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ID=5833938

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US00326863A Expired - Lifetime US3844034A (en) 1972-01-25 1973-01-26 Dry shaver

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US (1) US3844034A (de)
JP (1) JPS4882961A (de)
CH (1) CH546628A (de)
DE (1) DE2203346A1 (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4139940A (en) * 1976-12-13 1979-02-20 The Gillette Company Electric shaver
US20160226364A1 (en) * 2015-01-30 2016-08-04 Sunbeam Products, Inc. Electric Hair Clipper/Trimmer

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1045853B (de) * 1956-03-02 1958-12-04 Siemens Ag Elektrisches Trockenrasiergeraet mit von einem umlaufenden Antriebsmotor in hin- und hergehende Schwingbewegungen versetztem Schneidteil
US3389467A (en) * 1965-06-10 1968-06-25 Krups Robert Dry shaver having a spring biased rocking lever to reciprocate a cutter block
US3685149A (en) * 1970-09-10 1972-08-22 Krups Fa Robert Dry shaving device

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1045853B (de) * 1956-03-02 1958-12-04 Siemens Ag Elektrisches Trockenrasiergeraet mit von einem umlaufenden Antriebsmotor in hin- und hergehende Schwingbewegungen versetztem Schneidteil
US3389467A (en) * 1965-06-10 1968-06-25 Krups Robert Dry shaver having a spring biased rocking lever to reciprocate a cutter block
US3685149A (en) * 1970-09-10 1972-08-22 Krups Fa Robert Dry shaving device

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4139940A (en) * 1976-12-13 1979-02-20 The Gillette Company Electric shaver
US20160226364A1 (en) * 2015-01-30 2016-08-04 Sunbeam Products, Inc. Electric Hair Clipper/Trimmer

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Publication number Publication date
DE2203346A1 (de) 1973-08-02
CH546628A (de) 1974-03-15
JPS4882961A (de) 1973-11-06

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Legal Events

Date Code Title Description
AS Assignment

Owner name: ROBERT KRUPS STIFTUNG & CO., KG

Free format text: CHANGE OF NAME;ASSIGNOR:ROBERT KRUPS;REEL/FRAME:003933/0172

Effective date: 19810623