EP0375949A2 - Electric razor with a moving shaving head - Google Patents

Electric razor with a moving shaving head Download PDF

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Publication number
EP0375949A2
EP0375949A2 EP89121739A EP89121739A EP0375949A2 EP 0375949 A2 EP0375949 A2 EP 0375949A2 EP 89121739 A EP89121739 A EP 89121739A EP 89121739 A EP89121739 A EP 89121739A EP 0375949 A2 EP0375949 A2 EP 0375949A2
Authority
EP
European Patent Office
Prior art keywords
shaving
shaving head
housing
axis
dry
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.)
Granted
Application number
EP89121739A
Other languages
German (de)
French (fr)
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EP0375949A3 (en
EP0375949B1 (en
Inventor
Werner Messinger
Karl Trölltsch
Bernd Tewes
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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
Publication of EP0375949A2 publication Critical patent/EP0375949A2/en
Publication of EP0375949A3 publication Critical patent/EP0375949A3/en
Application granted granted Critical
Publication of EP0375949B1 publication Critical patent/EP0375949B1/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
    • B26B19/14—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
    • B26B19/146—Complete cutting head being movable
    • 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

Definitions

  • the invention relates to an electric dry shaving apparatus with a housing, a movably mounted shaving head, in which at least one shaving system with a circular upper knife and a rotating lower knife is provided, the axis of rotation of which is aligned at right angles to a shear plane running parallel to the outer surface of the upper knife, and with a shaving head axis of symmetry intersecting the shear plane at the geometric center of the surface of the shear system (s) provided.
  • An electric shaver with a shaving head is already known (EP-A 0 176 128), in which two or three rotating shaving systems are arranged.
  • the shaving head according to FIGS. 7 and 8 is rotatably mounted about a fixed shaving head symmetry axis running through the geometric center of the surface of the three shaving systems provided, so that the position of the shaving plane relative to the outer surface of the upper blades of the shaving systems relative to the razor housing is not changed.
  • 9 is mounted between support arms provided on the shaver housing.
  • the pivot axis of the shaving head is provided relatively far below the shear plane of the rotating shear systems.
  • the invention has for its object to arrange the shaving head of a razor such that the entire shear surface that can be used for shaving comes into contact with the skin surface at normal angles of incidence of its housing to the skin surface and that with changing loads or shear directions of the shaving head on the skin surface tilting of the shaving surface or a part of the usable shearing surface from the skin surface is prevented.
  • the entire usable shaving surface regardless of the pressure forces acting on it, should follow the skin contour without further ado in order to ensure a perfect shave.
  • this object is achieved in a device of the type mentioned at the outset in that the geometric center of the surface is provided as a stationary pole for the shaving head symmetry axis which can be moved in any direction with the shear plane.
  • This mounting of the shaving head ensures that the shaving surfaces of the shaving system (s) provided are automatically moved in the form of a shaving plane to the skin surface and remain there, irrespective of the pressing forces acting on this shearing plane and changing shifting directions of the shaving plane, within the normal normal setting angle of the shaving head to the skin surface Shaving head over the surface of the skin.
  • a particular advantage of this balanced shaving head bearing is that the respective pressure forces exerted on the handle of the razor are evenly distributed over the effective shaving surfaces after the shaving plane is in contact with the skin surface. Since the pole of the shaving head and thus the intended shaving system (s) in geometric center point of the intended shaving surfaces, the shaving head system can oscillate very easily and thus directly follow the skin surface.
  • the shear plane and the shaving head axis of symmetry can be moved about three spatial axes running through the pole and oriented at right angles to one another.
  • the common movement of the shaving plane and the shaving head symmetry axis can expediently be limited by means of stops provided on the shaving head and on the housing.
  • the housing of the shaving head is at least partially designed as a spherical shell, which is pivotably mounted in a bearing shell designed in the form of a spherical cap in the housing of the shaving apparatus.
  • the common center of the radii of the spherical shell and the bearing shell lies in the pole.
  • form-fitting guides are provided in the region of the spherical shell of the shaving head and the bearing shell of the housing in accordance with another advantageous embodiment of the invention , in such an orientation that movement around the vertical spatial axis Z is blocked.
  • an advantageous further development of the invention provides a separate coupling part which engages both in the guides of the spherical shell and in the bearing shell.
  • the coupling part is preferably provided with ribs and blocks which intersect at right angles, the coupling part being mountable on the concave side of the spherical shell and, with its blocks penetrating correspondingly dimensioned recesses in the spherical shell, engaging in guides of the bearing shell.
  • an expedient development of the invention provides only a form-fitting guidance between the shaving head and the housing.
  • the shaving system 1 shows an electric dry shaving apparatus 1 with a housing 2 serving as a handle and a shaving head 4 which can be moved about a stationary pole 3 and in which three shaving systems 5 are provided, two of which can be seen from the illustration.
  • the shaving systems 5 each consist of a circular upper knife 6 and associated rotating lower knives 7, the axes of rotation 8 of which are aligned at right angles to the shear plane E formed by the outer surfaces 9 of the upper knives 6.
  • the fixed pole 3 is in the embodiment 1 at the height of the shear plane E, the exact position in the shear plane E being determined by the geometric center of the surface of the shear systems 5 provided, as is explained in more detail under FIG. 2.
  • the shaving head symmetry axis 10 intersecting the shear plane E at right angles runs through the pole 3 and, together with the shear plane E, performs all pivoting movements of the shaving head 4 around the stationary pole 3.
  • This swiveling or tumbling movement of the shaving head 4 around the stationary or stationary pole 3 can also be described as a swiveling movement about three spatial axes x, y, z which are directed at right angles to one another and pass through this pole 3, with the shaving head 4 in the central position , ie in the non-swung-out position, the spatial axes x and y lie in the shear plane E and the spatial axis z coincides with the shaving head axis of symmetry 10; the shaving head 4 therefore has three degrees of freedom.
  • the housing 11 of the shaving head 4 is at least partially designed, namely on the housing side opposite the outer surface 9, as a spherical shell 12 which is movably supported in any direction in a bearing shell 13 provided in the housing 2 and in the form of a spherical cap.
  • the common center of the radius R1 of the spherical shell 12 and the radius R2 of the bearing shell 13 is in the pole 3rd
  • an electric motor 15 is fastened to a holder 14, which is coupled via a gear 16 to the lower knives 7 of the shear systems 5 provided, in order to set them into a rotational movement after the motor has been started up.
  • the motor 15, which is arranged centrally in the shaving head 4 in relation to the shaving head axis of symmetry 10, protrudes from the housing 11 and into the housing 2 through an opening 17 provided centrally to the center of the spherical cap-shaped bearing shell 13.
  • the engine is surrounded by a plate-shaped slide bearing part 18, which is held on the convex wall 19 of the bearing shell 13 facing the interior of the housing 2 by means of a sleeve 20 which can be screwed onto the motor 15 in a slidable manner.
  • the shaving head 4 is thus slidably attached to the housing 2 via the motor 15, the slide bearing part 18 and the bearing part 13.
  • the opening diameter of the opening 17 and thus of the shaving head 4 is larger than the outside diameter of the motor 15.
  • the edge of the opening 17 serves as a stop 21 to limit the freedom of movement of the motor 15 within the opening 17.
  • the size of the opening 17 is such that, starting from the central position of the shaving head 4, in which the shaving head axis of symmetry 10 through both the center of the Opening 17 as well as through the pole 3, the shaving head axis of symmetry 10 together with the shear plane E together with an angular movement ⁇ around the stationary pole 3 in any direction, ie can perform a wobble movement up to approx. 20 ° around the pole 3, as is indicated by the circle K around the spatial axis Z.
  • a seal 22 is provided between the spherical shell 12 and the bearing shell 13, preferably in the region of the outer edge thereof, which is made of plastic or a ceramic material and additionally the bearing function of the bearing shell 13 can also take over the function as a seal. Furthermore, the friction between the two components and the choice of the pressing force by means of the sleeve 20, the smoothness and damping of movement of the movable shaving head 4 can be adjusted by selecting the suitable materials of the spherical shell 12 or the seal 22.
  • the three shear systems 5 are arranged on the outer surface 9 of the shaving head 4 in such a way that the three drive axes 8 lie in the corners of an isosceles triangle whose center of area is identical to the stationary pole 3 as the geometric center of the area.
  • the shaving head axis of symmetry 10 perpendicular to the shear plane E and, when the shaving head 4 is in the center position, the spatial axis z.
  • the spatial axes x and y lying in the shear plane E are entered.
  • the shaving head 4.3 has only one shaving system 5.
  • the pole 3 is at the same time the center of the surface of the shaving head 4.3, and through it - perpendicular to the plane of the drawing, which also represents the shaving plane E - the shaving head axis of symmetry 10 and the spatial axis z.
  • the spatial axes x and y lie in the shear plane E and go through the pole 3; the axis of rotation 8 of the shear system 5 also passes through it.
  • the shaving head 4.5 has four shaving systems 5, the axes of rotation 8 of which are arranged in the corners of a square standing on the top.
  • the center of the area lies at the intersection of the diagonals of the square, which here are identical to the spatial axes x - y, and is at the same time the pole 3 through which the spatial axis z and the shaving head axis of symmetry 10 go - perpendicular to the plane of the drawing.
  • the shaving head 4.6 also has four shaving systems 5, the axes of rotation 8 of which are arranged in the corners of a square, in the center of whose surface the pole 3, the shaving head axis of symmetry 10 and the vertical spatial axis z lie, but in the manner that the spatial axes x and y going through the pole 3 are directed parallel to the sides of the square.
  • the electric dry shaving apparatus 1.7 according to FIG. 7 is of a similar construction to that shown in FIG. 1; it has a housing 2.7 serving as a handle, a shaving head 4.7 provided with the rotating shaving systems 5 and an electric motor 15.7 mounted therein.
  • the shear plane E is also defined here as the outer surface 9 of the shear systems 5.
  • the shaving head axis of symmetry 10 penetrates the shear plane E in the stationary pole 3, through which the spatial axes x and y lying in the shear plane E go even when the shaving head 4.7 is in the middle (FIG. 9 ).
  • the shaving head 4.7 is also formed on its side opposite the shear plane E in the manner of a spherical shell 12.7, which, as in the exemplary embodiment according to FIG.
  • the centerpiece of these guides is a coupling part 23, which has on its longitudinal sides 24 two parallel ribs 25 and 26, on the center of which, transversely to this, are placed two blocks 27 and 28 which project outwards and which act as Guide elements transverse to the guide direction of the ribs 25 and 26 are used.
  • a cutout 29 for the motor 15.7 which is dimensioned such that it closely encloses the motor with the longitudinal sides 24, ie parallel to the ribs 25 and 26, while between the transverse sides 30, ie parallel to the blocks 27 and 28 and the corresponding dimensions of the motor 15.7 a game is provided which allows a relative movement of the motor 15.7 relative to the coupling part 23 within the selected pivoting movement of the shaving head 4.7.
  • FIG. 9 shows these relationships in a top view with a view of the concave side of the spherical shell 12.7 when the coupling part 23 is inserted in a schematic representation.
  • a central recess 36 for the motor 15.7 which has such an excess compared to its cross-sectional dimensions that the motor 15.7 can move freely in the direction of the x- and y-space axes when the shaving head is pivoted .
  • This recess 36 is adjoined on both sides - as shown in FIG. 9 - in the middle of its longitudinal edges by recesses 37 and 38 (FIG. 8) which are made transversely to the direction of the ribs 25 and 26.
  • the blocks 27, 28 engage in these recesses 37 and 38 for the purpose of guiding the pivoting movement of the shaving head 4.7 about the y-spatial axis.
  • the coupling part 23 is pushed onto the motor 15.7 before it is fastened in the shaving head 4.7 until the ribs 25, 26 engage in their recesses serving as guides and the blocks 27, 28 pass through the recesses 34, 35 to engage in them assigned, serving as a guide recesses 37, 38 come to rest in the bearing shell 13.7.
  • Ver tension of the shaving head 4.7 with the bearing shell 13.7 of the housing 2.7 also serves here a sleeve 39 which can be screwed onto the motor 15.7 and presses against the convex side of the bearing shell 13.7 via a slide bearing part 40.
  • the narrow sides of the slot-like recesses serve as stops to limit the pivoting movements of the shaving head.
  • a pivoting movement is provided only about a spatial axis passing through the pole 3, the x-axis.
  • the movements around the y and z spatial axes are blocked.
  • the structural design otherwise corresponds to the exemplary embodiment in FIG. 1.
  • the pole 3 lies at the point of intersection of the shaving head axis of symmetry 10 with the shear plane E, which is determined by the surface of the shear systems 5.
  • the electric motor 15 for driving the shaving systems 5 is fastened in the shaving head 4 and penetrates the underside of the shaving head 4, which is designed as a spherical shell 12, in the recess 41 and the spherical cap-shaped bearing shell 13 of the housing 2 in the recess 42; this is widened in the pivoting direction of the shaving head 4 and thus of the motor 15 by such an amount compared to the cross-sectional dimensions of the motor 15 that the motor 15 can move freely in this direction.
  • the motor 15 is surrounded by a plate-like slide bearing part 18, which is held in a slidable contact with the convex side of the bearing shell 13 by a sleeve 20 which can be screwed onto the motor 15.
  • a seal 22 is provided between the shaving head 4 and the housing 2.
  • the radii R1 of the spherical shell 12 and R2 of the bearing shell 13 have their common starting point in pole 3.

Abstract

An electric razor is equipped with a housing, a movably mounted shaving head, a shaving system with at least one circular upper cutter and rotating lower cutter whose axis of rotation extends perpendicularly to a shaving plane extending parallel to the outer surface of the upper cutter. In the geometric centre of area of the shaving systems, the moveable shaving-head axis of symmetry cuts the shaving plane in any desired direction. The geometric centre of area is provided as a static pole. <IMAGE>

Description

Die Erfindung bezieht sich auf einen elektrischen Trockenrasier­apparat mit einem Gehäuse, einem bewegbar gelagerten Scherkopf, in dem wenigstens ein Schersystem mit einem kreisrunden Obermesser und einem rotierenden Untermesser vorgesehen ist, dessen Rota­tionsachse rechtwinklig zu einer parallel zur Außenoberfläche des Obermessers verlaufenden Scherebene ausgerichtet ist, und mit einer die Scherebene im geometrischen Flächenmittelpunkt des bzw. der vorgesehenen Schersysteme rechtwinklig schneidenden Scherkopf­symmetrieachse.The invention relates to an electric dry shaving apparatus with a housing, a movably mounted shaving head, in which at least one shaving system with a circular upper knife and a rotating lower knife is provided, the axis of rotation of which is aligned at right angles to a shear plane running parallel to the outer surface of the upper knife, and with a shaving head axis of symmetry intersecting the shear plane at the geometric center of the surface of the shear system (s) provided.

Es ist bereits ein elektrischer Rasierapparat mit einem Scherkopf bekannt (EP-A 0 176 128), in dem zwei bzw. drei rotierende Scher­systeme angeordnet sind. Der Scherkopf nach den Figuren 7 und 8 ist um eine feststehende, durch den geometrischen Flächenmittel­punkt der drei vorgesehenen Schersysteme verlaufende Scherkopf­symmetrieachse drehbar gelagert, so daß die Lage der parallel zur Außenoberfläche der Obermesser der Schersysteme verlaufenden Scherebene zum Rasierergehäuse nicht verändert wird. Der Scherkopf nach Fig. 9 ist zwischen am Gehäuse des Rasierapparates vorgesehe­nen Trägerarmen gelagert. Die Schwenkachse des Scherkopfes ist re­lativ weit unterhalb der Scherebene der rotierenden Schersysteme vorgesehen. Aufgrund des relativ großen Abstandes zwischen der Scherebene der Schersysteme und der Schwenkachse wird als Folge der senkrecht auf die Scherebene einwirkenden Anlagekraft der je­weiligen Schiebekraft, mit der die Scherebene über die Hautober­fläche geführt wird, ein Drehmoment erzeugt, das in einer Schiebe­richtung die Scherebene zur Anlage an die Hautoberfläche dreht und in der entgegengesetzten Schieberichtung die Scherebene von der Hautoberfläche wegkippt. Je größer der Abstand zwischen der Scherebene und der Schwenkachse liegt, desto größer ist auch das wegkippende Drehmoment, so daß eine ständige Anlage der Scherebene der vorgesehenen Schersysteme an der Haut nicht gewährleistet ist.An electric shaver with a shaving head is already known (EP-A 0 176 128), in which two or three rotating shaving systems are arranged. The shaving head according to FIGS. 7 and 8 is rotatably mounted about a fixed shaving head symmetry axis running through the geometric center of the surface of the three shaving systems provided, so that the position of the shaving plane relative to the outer surface of the upper blades of the shaving systems relative to the razor housing is not changed. 9 is mounted between support arms provided on the shaver housing. The pivot axis of the shaving head is provided relatively far below the shear plane of the rotating shear systems. Due to the relatively large distance between the shear plane of the shear systems and the swivel axis, a torque is generated as a result of the contact force of the respective pushing force acting perpendicularly on the shear plane, with which the shear plane is guided over the skin surface, which generates a torque in a sliding direction against the system the skin surface rotates and the shear plane tilts away from the skin surface in the opposite sliding direction. The greater the distance between the Shear plane and the swivel axis, the greater the torque that tilts away, so that a constant contact of the shear plane of the intended shear systems with the skin is not guaranteed.

Der Erfindung liegt die Aufgabe zugrunde, den Scherkopf eines Rasierapparates derart bewegbar anzuordnen, daß bei normal üb­lichen Anstellwinkeln seines Gehäuses zur Hautfläche die gesamte für eine Rasur nutzbare Scherfläche an der Hautfläche zur Anlage kommt und daß bei wechselnden Belastungen bzw. Schieberichtungen des Scherkopfes an der Hautfläche ein Wegkippen der Scherfläche bzw. eines Teils der nutzbaren Scherfläche von der Hautoberfläche verhindert wird. Die gesamte nutzbare Scherfläche soll, unabhängig von den jeweiligen auf sie einwirkenden Andruckkräften, der Haut­kontur ohne weiteres folgen, um eine einwandfreie Rasur zu gewähr­leisten.The invention has for its object to arrange the shaving head of a razor such that the entire shear surface that can be used for shaving comes into contact with the skin surface at normal angles of incidence of its housing to the skin surface and that with changing loads or shear directions of the shaving head on the skin surface tilting of the shaving surface or a part of the usable shearing surface from the skin surface is prevented. The entire usable shaving surface, regardless of the pressure forces acting on it, should follow the skin contour without further ado in order to ensure a perfect shave.

Nach der Erfindung wird diese Aufgabe bei einem Gerät der eingangs genannten Art dadurch gelöst, daß der geometrische Flächenmittel­punkt als ruhender Pol für die mit der Scherebene in beliebiger Richtung bewegbare Scherkopfsymmetrieachse vorgesehen ist. Diese Lagerung des Scherkopfes gewährleistet, daß innerhalb normal übli­cher Anstellwinkel des Scherkopfes des Rasierapparates zur Haut­oberfläche automatisch die Scherflächen des bzw. der vorgesehenen Schersysteme in Form einer Scherebene zur Hautfläche bewegt werden und dort verbleiben, unabhängig von den auf diese Scherebene ein­wirkenden Andruckkräften und wechselnden Schieberichtungen des Scherkopfes über die Hautoberfläche. Ein besonderer Vorteil dieser ausgeglichenen Scherkopflagerung besteht darin, daß die jeweiligen über den Handgriff des Rasierapparates ausgeübten Andruckkräfte nach Anlage der Scherebene an die Hautoberfläche sich gleichmäßig über die wirksamen Scherflächen aufteilen. Da der Pol des Scher­kopfes und somit des bzw. der vorgesehenen Schersysteme im geometrischen Flächenmittelpunkt der vorgesehenen Scherflächen liegt, kann das Scherkopfsystem sehr leicht pendeln und somit direkt der Hautoberfläche folgen.According to the invention, this object is achieved in a device of the type mentioned at the outset in that the geometric center of the surface is provided as a stationary pole for the shaving head symmetry axis which can be moved in any direction with the shear plane. This mounting of the shaving head ensures that the shaving surfaces of the shaving system (s) provided are automatically moved in the form of a shaving plane to the skin surface and remain there, irrespective of the pressing forces acting on this shearing plane and changing shifting directions of the shaving plane, within the normal normal setting angle of the shaving head to the skin surface Shaving head over the surface of the skin. A particular advantage of this balanced shaving head bearing is that the respective pressure forces exerted on the handle of the razor are evenly distributed over the effective shaving surfaces after the shaving plane is in contact with the skin surface. Since the pole of the shaving head and thus the intended shaving system (s) in geometric center point of the intended shaving surfaces, the shaving head system can oscillate very easily and thus directly follow the skin surface.

Der Vorteil der erfindungsgemäßen Lösung der gestellten Aufgabe wird auch dann noch erreicht, wenn durch eine elastische und/oder kippbare Lagerung des oder der Schersysteme eine geringfügige Ver­schiebung und/oder Verformung der Scherebene gegenüber dem ruhen­den Pol auftritt. Solche vorübergehend geometrische Abweichungen liegen daher im Schutzumfange des Hauptanspruches.The advantage of the achievement of the object according to the invention is also achieved when a slight displacement and / or deformation of the shear plane with respect to the stationary pole occurs due to an elastic and / or tiltable mounting of the shear system or systems. Such temporary geometric deviations are therefore within the scope of the main claim.

Nach einem Vorteil der Erfindung ist die Scherebene und die Scher­kopfsymmetrieachse um drei durch den Pol verlaufende, rechtwinklig zueinander gerichtete Raumachsen bewegbar.According to one advantage of the invention, the shear plane and the shaving head axis of symmetry can be moved about three spatial axes running through the pole and oriented at right angles to one another.

Zweckmäßig ist dabei die gemeinsame Bewegung der Scherebene und der Scherkopfsymmetrieachse mittels am Scherkopf und am Gehäuse vorgesehener Anschläge begrenzbar.The common movement of the shaving plane and the shaving head symmetry axis can expediently be limited by means of stops provided on the shaving head and on the housing.

In einer vorteilhaften Ausbildung der Erfindung ist vorgesehen, daß das Gehäuse des Scherkopfes wenigstens teilweise als Kugel­schale ausgebildet ist, die in einer im Gehäuse des Rasierappara­tes vorgesehenen, kugelkalottenartig ausgebildeten Lagerschale schwenkbar gelagert ist. Der gemeinsame Mittelpunkt der Radien der Kugelschale und der Lagerschale liegt im Pol.In an advantageous embodiment of the invention it is provided that the housing of the shaving head is at least partially designed as a spherical shell, which is pivotably mounted in a bearing shell designed in the form of a spherical cap in the housing of the shaving apparatus. The common center of the radii of the spherical shell and the bearing shell lies in the pole.

Nähere vorteilhafte Ausbildungsformen der Erfindung gehen aus den Kennzeichen der Unteransprüche 6 bis 9 hervor.Further advantageous forms of training of the invention emerge from the characteristics of subclaims 6 to 9.

Will man die Schwenkbewegung des Scherkopfes um alle drei Raum­achsen x, y und z auf eine Bewegung nur um die zwei Raumachsen x und y beschränken, sind gemäß einer anderen vorteilhaften Ausbil­dungsform der Erfindung formschlüssige Führungen im Bereich der Kugelschale des Scherkopfes und der Lagerschale des Gehäuses vor­gesehen, in solcher Ausrichtung, daß eine Bewegung um die verti­kale Raumachse Z gesperrt ist. Zu diesem Zweck sieht eine vorteil­hafte Weiterbildung der Erfindung ein separates, sowohl in die Führungen der Kugelschale als auch der Lagerschale eingreifendes Kupplungsteil vor. Vorzugsweise ist das Kupplungsteil mit sich rechtwinklig kreuzenden Rippen und Blöcken versehen, wobei das Kupplungsteil auf der Konkavseite der Kugelschale montierbar ist und, mit seinen Blöcken entsprechend bemessene Aussparungen der Kugelschale durchdringend, in Führungen der Lagerschale eingreift.If you want to limit the pivoting movement of the shaving head around all three spatial axes x, y and z to a movement only around the two spatial axes x and y, form-fitting guides are provided in the region of the spherical shell of the shaving head and the bearing shell of the housing in accordance with another advantageous embodiment of the invention , in such an orientation that movement around the vertical spatial axis Z is blocked. For this purpose, an advantageous further development of the invention provides a separate coupling part which engages both in the guides of the spherical shell and in the bearing shell. The coupling part is preferably provided with ribs and blocks which intersect at right angles, the coupling part being mountable on the concave side of the spherical shell and, with its blocks penetrating correspondingly dimensioned recesses in the spherical shell, engaging in guides of the bearing shell.

Bei weiterer Beschränkung der Bewegung der Scherkopfes um nur eine Raumachse x oder y sieht eine zweckmäßige Weiterbildung der Erfin­dung nur eine formschlüssige Führung zwischen Scherkopf und Ge­häuse vor.If the movement of the shaving head is further restricted by only one spatial axis x or y, an expedient development of the invention provides only a form-fitting guidance between the shaving head and the housing.

Weitere Vorteile und Einzelheiten der Erfindung ergeben sich aus der nachfolgenden Beschreibung und den Zeichnungen, in denen einige bevorzugte Ausführungsbeispiele dargestellt sind, und zwar zeigen:

  • Fig. 1 eine schematische Darstellung eines elektrischen Trockenrasierapparates mit einem Scherkopf, in dem drei in einer Scherebene liegende Schersysteme mit rotieren­den Untermessern, die gemeinsam mit dem Scherkopfrahmen um einen ruhenden Pol in beliebiger Richtung verschwenk­bar sind, vorgesehen sind;
  • Fig. 2 eine Draufsicht auf den Scherkopf gemäß Fig. 1;
  • Fig. 3-6 vier Scherköpfe in Draufsicht mit verschiedener Anord­nung und Anzahl des oder der Schersysteme und ihre Lage in bezug auf den ruhenden Pol;
  • Fig. 7 ein weiteres Ausführungsbeispiel eines elektrischen Trockenrasierapparates mit in zwei Richtungen schwenk­barem Scherkopf in schematischer Darstellung;
  • Fig. 8 eine Ansicht längs der Schnittlinie 8 - 8 in Fig. 7, in schematischer Darstellung;
  • Fig. 9 eine Einzelheit aus Fig. 7 in Draufsicht;
  • Fig. 10 eine weitere Einzelheit aus Fig. 7 in perspektivischer Ansicht;
  • Fig. 11 ein weiteres Ausführungsbeispiel eines elektrischen Trockenrasierapparates mit in einer Richtung schwenk­barem Scherkopf in schematischer Darstellung;
  • Fig. 12 eine konstruktive Variante zum Ausführungsbeispiel gemäß Fig. 11.
Further advantages and details of the invention result from the following description and the drawings, in which some preferred exemplary embodiments are shown, namely:
  • Figure 1 is a schematic representation of an electric dry shaver with a shaving head, in which three shaving systems are located in a shear plane with rotating lower knives, which can be pivoted together with the shaving head frame about a stationary pole in any direction.
  • FIG. 2 shows a top view of the shaving head according to FIG. 1;
  • Fig. 3-6 four shaving heads in plan view with different arrangement and number of the shaving system or systems and their position in relation to the stationary pole;
  • 7 shows a further exemplary embodiment of an electric dry shaving apparatus with a shaving head which can be pivoted in two directions in a schematic illustration;
  • 8 shows a view along the section line 8 - 8 in FIG. 7 in a schematic illustration;
  • FIG. 9 shows a detail from FIG. 7 in plan view;
  • FIG. 10 shows a further detail from FIG. 7 in a perspective view;
  • 11 shows a further exemplary embodiment of an electric dry shaving apparatus with a shaving head which can be pivoted in one direction in a schematic illustration;
  • 12 shows a constructive variant of the exemplary embodiment according to FIG. 11.

Fig. 1 zeigt einen elektrischen Trockenrasierapparat 1 mit einem als Handgriff dienenden Gehäuse 2 und einem um einen ortsfesten Pol 3 bewegbaren Scherkopf 4, in dem drei Schersysteme 5 vorge­sehen sind, von denen zwei aus der Darstellung ersichtlich sind. Die Schersysteme 5 bestehen jeweils aus einem kreisrunden Ober­messer 6 und diesen zugeordneten, rotierenden Untermessern 7, deren Rotationsachsen 8 rechtwinklig zu der von den Außenober­flächen 9 der Obermesser 6 gebildeten Scherebene E ausgerichtet sind. Der ortsfeste Pol 3 liegt bei dem Ausführungsbeispiel nach Fig. 1 in Höhe der Scherebene E, wobei die genaue Lage in der Scherebene E bestimmt ist durch den geometrischen Flächenmittel­punkt der vorgesehenen Schersysteme 5, wie unter Fig. 2 näher er­läutert ist. Die die Scherebene E rechtwinklig schneidende Scher­kopfsymmetrieachse 10 verläuft durch den Pol 3 und führt gemeinsam mit der Scherebene E sämtliche Schwenkbewegungen des Scherkopfes 4 um den ortsfesten Pol 3 aus.1 shows an electric dry shaving apparatus 1 with a housing 2 serving as a handle and a shaving head 4 which can be moved about a stationary pole 3 and in which three shaving systems 5 are provided, two of which can be seen from the illustration. The shaving systems 5 each consist of a circular upper knife 6 and associated rotating lower knives 7, the axes of rotation 8 of which are aligned at right angles to the shear plane E formed by the outer surfaces 9 of the upper knives 6. The fixed pole 3 is in the embodiment 1 at the height of the shear plane E, the exact position in the shear plane E being determined by the geometric center of the surface of the shear systems 5 provided, as is explained in more detail under FIG. 2. The shaving head symmetry axis 10 intersecting the shear plane E at right angles runs through the pole 3 and, together with the shear plane E, performs all pivoting movements of the shaving head 4 around the stationary pole 3.

Diese Schwenk- oder Taumelbewegung des Scherkopfes 4 um den orts­festen oder ruhenden Pol 3 kann auch als Schwenkbewegung um drei durch diesen Pol 3 gehende, rechtwinklig zueinander gerichtete, im Raum ortsfeste Raumachsen x, y, z beschrieben werden, wobei in der Mittelstellung des Scherkopfes 4, also in der nicht ausgeschwenk­ten Stellung, die Raumachsen x und y in der Scherebene E liegen und die Raumachse z mit der Scherkopfsymmetrieachse 10 zusammen­fällt; der Scherkopf 4 hat demnach drei Freiheitsgrade. Das Ge­häuse 11 des Scherkopfes 4 ist wenigstens teilweise, und zwar auf der der Außenoberfläche 9 gegenüberliegenden Gehäuseseite als Kugelschale 12 ausgebildet, die in einer im Gehäuse 2 vorgesehe­nen, kugelkalottenartig ausgebildeten Lagerschale 13 in beliebige Richtungen bewegbar gelagert ist. Der gemeinsame Mittelpunkt des Radius R₁ der Kugelschale 12 sowie des Radius R₂ der Lager­schale 13 liegt im Pol 3.This swiveling or tumbling movement of the shaving head 4 around the stationary or stationary pole 3 can also be described as a swiveling movement about three spatial axes x, y, z which are directed at right angles to one another and pass through this pole 3, with the shaving head 4 in the central position , ie in the non-swung-out position, the spatial axes x and y lie in the shear plane E and the spatial axis z coincides with the shaving head axis of symmetry 10; the shaving head 4 therefore has three degrees of freedom. The housing 11 of the shaving head 4 is at least partially designed, namely on the housing side opposite the outer surface 9, as a spherical shell 12 which is movably supported in any direction in a bearing shell 13 provided in the housing 2 and in the form of a spherical cap. The common center of the radius R₁ of the spherical shell 12 and the radius R₂ of the bearing shell 13 is in the pole 3rd

Im Gehäuse 11 ist an einer Halterung 14 ein Elektromotor 15 be­festigt, der über ein Getriebe 16 mit den Untermessern 7 der vor­gesehenen Schersysteme 5 gekoppelt ist, um diese nach Inbetrieb­nahme des Motors in eine Rotationsbewegung zu versetzen. Der zen­trisch zur Scherkopfsymmetrieachse 10 im Scherkopf 4 angeordnete Motor 15 ragt aus dem Gehäuse 11 heraus und durch eine zentrisch zum Mittelpunkt der kugelkalottenartig ausgebildeten Lagerschale 13 vorgesehenen Öffnung 17 in das Gehäuse 2 hinein. Der Motor ist von einem tellerartig geformten Gleitlagerteil 18 umgeben, das an der dem Inneren des Gehäuses 2 zugewandten, konvexen Wand 19 der Lagerschale 13 mittels eines auf den Motor 15 aufschraubbaren Hülse 20 in gleitbarer Anlage gehalten ist.In the housing 11, an electric motor 15 is fastened to a holder 14, which is coupled via a gear 16 to the lower knives 7 of the shear systems 5 provided, in order to set them into a rotational movement after the motor has been started up. The motor 15, which is arranged centrally in the shaving head 4 in relation to the shaving head axis of symmetry 10, protrudes from the housing 11 and into the housing 2 through an opening 17 provided centrally to the center of the spherical cap-shaped bearing shell 13. The engine is surrounded by a plate-shaped slide bearing part 18, which is held on the convex wall 19 of the bearing shell 13 facing the interior of the housing 2 by means of a sleeve 20 which can be screwed onto the motor 15 in a slidable manner.

Der Scherkopf 4 ist sonach über den Motor 15, das Gleitlagerteil 18 und das Lagerteil 13 am Gehäuse 2 gleitbar befestigt. Der Öff­nungsdurchmesser der Öffnung 17 und somit des Scherkopfes 4 ist gegenüber dem Außendurchmesser des Motors 15 größer ausgebildet. Der Rand der Öffnung 17 dient als Anschlag 21 zur Begrenzung der Bewegungsfreiheit des Motors 15 innerhalb der Öffnung 17. Die Größe der Öffnung 17 ist derart bemessen, daß, ausgehend von der Mittenstellung des Scherkopfes 4, in der dessen Scherkopfsymme­trieachse 10 sowohl durch den Mittelpunkt der Öffnung 17 als auch durch den Pol 3 verläuft, die Scherkopfsymmetrieachse 10 mit der Scherebene E gemeinsam eine Winkelbewegung α um den ortsfesten Pol 3 in beliebiger Richtung, d.h. eine Taumelbewegung bis zu ca. 20° um den Pol 3 ausführen kann, wie dies durch den Kreis K um die Raumachse Z angedeutet ist.The shaving head 4 is thus slidably attached to the housing 2 via the motor 15, the slide bearing part 18 and the bearing part 13. The opening diameter of the opening 17 and thus of the shaving head 4 is larger than the outside diameter of the motor 15. The edge of the opening 17 serves as a stop 21 to limit the freedom of movement of the motor 15 within the opening 17. The size of the opening 17 is such that, starting from the central position of the shaving head 4, in which the shaving head axis of symmetry 10 through both the center of the Opening 17 as well as through the pole 3, the shaving head axis of symmetry 10 together with the shear plane E together with an angular movement α around the stationary pole 3 in any direction, ie can perform a wobble movement up to approx. 20 ° around the pole 3, as is indicated by the circle K around the spatial axis Z.

Um zu verhindern, daß Schmutzpartikel, insbesondere Haarstaub, in das Innere des Gehäuses 2 dringen kann, ist zwischen der Kugel­schale 12 und der Lagerschale 13 vorzugsweise im Bereich dessen Außenrandes eine Dichtung 22 vorgesehen, die aus Kunststoff oder auch aus einem keramischen Material bestehen und zusätzlich zu der Funktion als Dichtung auch die Lagerfunktion der Lagerschale 13 übernehmen kann. Ferner kann durch Wahl der geeigneten Materialen der Kugelschale 12 bzw. der Dichtung 22 die Reibung zwischen bei­den Bauteilen und durch Wahl der Andruckkraft mittels der Hülse 20 die Leichtgängigkeit und Bewegungsdämpfung des bewegbaren Scher­kopfes 4 eingestellt werden.In order to prevent dirt particles, in particular hair dust, from penetrating into the interior of the housing 2, a seal 22 is provided between the spherical shell 12 and the bearing shell 13, preferably in the region of the outer edge thereof, which is made of plastic or a ceramic material and additionally the bearing function of the bearing shell 13 can also take over the function as a seal. Furthermore, the friction between the two components and the choice of the pressing force by means of the sleeve 20, the smoothness and damping of movement of the movable shaving head 4 can be adjusted by selecting the suitable materials of the spherical shell 12 or the seal 22.

Aus Fig. 2 ist ersichtlich, daß die drei Schersysteme 5 derart auf der Außenfläche 9 des Scherkopfes 4 angeordnet sind, daß die drei Antriebsachsen 8 in den Ecken eines gleichschenkligen Dreiecks liegen, dessen Flächenschwerpunkt als geometrischer Flächenmittel­punkt mit dem ruhenden Pol 3 identisch ist. Durch dessen Mittel­punkt bzw. Pol 3 geht die senkrecht auf der Scherebene E stehende Scherkopfsymmetrieachse 10 und bei Mittelstellung des Scherkopfes 4 auch die Raumachse z. Ferner sind die in der Scherebene E lie­genden Raumachsen x und y eingetragen.From Fig. 2 it can be seen that the three shear systems 5 are arranged on the outer surface 9 of the shaving head 4 in such a way that the three drive axes 8 lie in the corners of an isosceles triangle whose center of area is identical to the stationary pole 3 as the geometric center of the area. Through its center or pole 3, the shaving head axis of symmetry 10 perpendicular to the shear plane E and, when the shaving head 4 is in the center position, the spatial axis z. Furthermore, the spatial axes x and y lying in the shear plane E are entered.

Nach Fig. 3 besitzt der Scherkopf 4.3 nur ein Schersystem 5. Der Pol 3 ist gleichzeitig Flächenmittelpunkt des Scherkopfes 4.3, und durch ihn gehen - senkrecht zur Zeichenebene, die hier auch die Scherebene E darstellt - die Scherkopfsymmetrieachse 10 und die Raumachse z. Die Raumachsen x und y liegen in der Scherebene E und gehen durch den Pol 3; durch ihn geht ebenfalls die Rotationsachse 8 des Schersystems 5.3, the shaving head 4.3 has only one shaving system 5. The pole 3 is at the same time the center of the surface of the shaving head 4.3, and through it - perpendicular to the plane of the drawing, which also represents the shaving plane E - the shaving head axis of symmetry 10 and the spatial axis z. The spatial axes x and y lie in the shear plane E and go through the pole 3; the axis of rotation 8 of the shear system 5 also passes through it.

Nach Fig. 4 hat der Scherkopf 4.4 zwei Schersysteme 5; auf der Mitte der Verbindungslinie zwischen den Rotationsachsen 8 und da­mit im Flächenmittelpunkt liegt der Pol 3, durch den sowohl die Scherkopfsymmetrieachse 10 und die Raumachse z senkrecht zur Zei­chenebene = Scherebene E geht als auch die in dieser Ebene liegen­den Raumachsen x und y.4 the shaving head 4.4 has two shaving systems 5; on the middle of the connecting line between the axes of rotation 8 and thus in the center of the surface lies the pole 3 through which both the shaving head axis of symmetry 10 and the spatial axis z go perpendicular to the plane of the drawing = shear plane E and the spatial axes x and y lying in this plane.

Nach Fig. 5 hat der Scherkopf 4.5 vier Schersysteme 5, deren Ro­tationsachsen 8 in den Ecken eines auf der Spitze stehenden Qua­drates angeordnet sind. Der Flächenmittelpunkt liegt im Schnitt­punkt der Diagonalen des Quadrates, die hier identisch mit den Raumachsen x - y sind, und ist gleichzeitig der Pol 3, durch den die Raumachse z und die Scherkopfsymmetrieachse 10 - senkrecht zur Zeichenebene - gehen.5, the shaving head 4.5 has four shaving systems 5, the axes of rotation 8 of which are arranged in the corners of a square standing on the top. The center of the area lies at the intersection of the diagonals of the square, which here are identical to the spatial axes x - y, and is at the same time the pole 3 through which the spatial axis z and the shaving head axis of symmetry 10 go - perpendicular to the plane of the drawing.

Nach Fig. 6 hat der Scherkopf 4.6 ebenfalls vier Schersysteme 5, deren Rotationsachsen 8 in den Ecken eines Quadrates angeordnet sind, in dessen Flächenmittelpunkt in vorstehend beschriebener Weise der Pol 3, die Scherkopfsymmetrieachse 10 und die vertikale Raumachse z liegen, jedoch in der Weise, daß die durch den Pol 3 gehenden Raumachsen x und y parallel zu den Seiten des Quadrates gerichtet sind.6, the shaving head 4.6 also has four shaving systems 5, the axes of rotation 8 of which are arranged in the corners of a square, in the center of whose surface the pole 3, the shaving head axis of symmetry 10 and the vertical spatial axis z lie, but in the manner that the spatial axes x and y going through the pole 3 are directed parallel to the sides of the square.

Der elektrische Trockenrasierapparat 1.7 gemäß Fig. 7 ist von ähn­lichem Aufbau wie der in Fig. 1 dargestellte; er hat ein als Hand­griff dienendes Gehäuse 2.7, einen mit den rotierenden Scher­systemen 5 versehenen Scherkopf 4.7 und einen in diesem montierten Elektromotor 15.7. Die Scherebene E ist auch hier definiert als die Außenoberfläche 9 der Schersysteme 5. Die Scherkopfsymmetrie­achse 10 durchstößt die Scherebene E im ruhenden Pol 3, durch den auch bei Mittelstellung des Scherkopfes 4.7 die in der Scherebene E liegenden Raumachsen x und y gehen (Fig. 9). Der Scherkopf 4.7 ist ferner auf seiner der Scherebene E entgegengesetzten Seite ebenfalls nach Art einer Kugelschale 12.7 ausgebildet, die wie bei dem Ausführungsbeispiel nach Fig. 1, mit einer kugelkalottenar­tigen Lagerschale 13.7 des Gehäuses 2.7 korrespondiert. Zwischen beiden Schalen 12.7 und 13.7 ist ebenfalls eine Dichtung 22.7 an­gebracht. Der gemeinsame Mittelpunkt beider Radien R₁ und R₂ der Schalen 12.7 und 13.7 ist der Pol 3. Zur Bestimmung der Schwenkbewegung des Scherkopfes 4.7, ausschließlich um die Raum­achsen x und y, d.h. Ausschluß einer Schwenkbewegung um die Verti­kalachse Z bzw. Scherkopfsymmetrieachse 10, sind zwischen den Schalen 12.7 und 13.7 wirkende, formschlüssige Führungen vorge­sehen, die nachstehend in Verbindung mit den Figuren 8, 9 und 10 näher beschrieben sind. Kernstück dieser Führungen ist ein Kupp­lungsteil 23, das an seinen Längsseiten 24 zwei parallele Rippen 25 und 26 aufweist, auf deren Mitte, quer zu diesem, zwei frei nach außen abstehende Blöcke 27 und 28 aufgesetzt sind, die als Führungselemente quer zur Führungsrichtung der Rippen 25 und 26 dienen. In der Mitte des Kupplungsteiles 23 ist eine Aussparung 29 für den Motor 15.7 angebracht, die so bemessen ist, daß sie den Motor mit den Längsseiten 24, d.h. parallel zu den Rippen 25 und 26 eng umschließt, während zwischen den Querseiten 30, d.h. pa­rallel zu den Blöcken 27 und 28 und den entsprechenden Maßen des Motors 15.7 ein Spiel vorgesehen ist, das eine Relativbewegung des Motors 15.7 gegenüber dem Kupplungsteil 23 im Rahmen der gewählten Schwenkbewegung des Scherkopfes 4.7 erlaubt. In der Kugelschale 12.7 des Scherkopfes 4.7 sind eine zentrale Aussparung 31 mit den Abmessungen des Motorquerschnittes (siehe Fig. 8) und schlitz­artige Ausnehmungen 32, 33 für die Rippen 25, 26 und Ausnehmungen 34, 35 für die Blöcke 27, 28 vorgesehen. Fig. 9 zeigt diese Ver­hältnisse in Draufsicht mit Blick in die Konkavseite der Kugel­schale 12.7 bei eingesetztem Kupplungsteil 23 in schematischer Darstellung. Entsprechend ist in der Lagerschale 13.7 des Gehäuses 2.7 eine zentrale Aussparung 36 für den Motor 15.7 angebracht, die gegenüber seinen Querschnittsabmessungen ein solches Übermaß auf­weist, daß sich der Motor 15.7 bei der Schwenkbewegung des Scher­kopfes in Richtung der x- und y-Raumachse frei bewegen kann. An diese Aussparung 36 schließen sich nach beiden Seiten - entspre­chend der Darstellung in Fig. 9 - in der Mitte ihrer Längskanten Ausnehmungen 37 und 38 (Fig. 8) an, die quer zur Richtung der Rippen 25 und 26 angebracht sind. In diese Ausnehmungen 37 und 38 greifen die Blöcke 27, 28 zwecks Führung der Schwenkbewegung des Scherkopfes 4.7 um die y-Raumachse ein. Ihre Länge ist nach dem gewählten Maß des Ausschlags der Schwenkbewegung bestimmt. Zur Montage wird das Kupplungsteil 23 auf den Motor 15.7 vor seiner Befestigung im Scherkopf 4.7 soweit aufgeschoben, bis die Rippen 25, 26 in ihre als Führungen dienende Ausnehmungen eingreifen und die Blöcke 27, 28 durch die Ausnehmungen 34, 35 hindurchgreifen, um in den ihnen zugeordneten, als Führung dienenden Ausnehmungen 37, 38 in der Lagerschale 13.7 zur Anlage zu kommen. Zur Ver­ spannung des Scherkopfes 4.7 mit der Lagerschale 13.7 des Gehäuses 2.7 dient auch hier eine Hülse 39, die auf den Motor 15.7 auf­schraubbar ist und über ein Gleitlagerteil 40 gegen die Konvex­seite der Lagerschale 13.7 drückt. Die Schmalseiten der schlitzartigen Ausnehmungen dienen als Anschläge zur Begrenzung der Schwenkbewegungen des Scherkopfes.The electric dry shaving apparatus 1.7 according to FIG. 7 is of a similar construction to that shown in FIG. 1; it has a housing 2.7 serving as a handle, a shaving head 4.7 provided with the rotating shaving systems 5 and an electric motor 15.7 mounted therein. The shear plane E is also defined here as the outer surface 9 of the shear systems 5. The shaving head axis of symmetry 10 penetrates the shear plane E in the stationary pole 3, through which the spatial axes x and y lying in the shear plane E go even when the shaving head 4.7 is in the middle (FIG. 9 ). The shaving head 4.7 is also formed on its side opposite the shear plane E in the manner of a spherical shell 12.7, which, as in the exemplary embodiment according to FIG. 1, corresponds to a spherical cap-like bearing shell 13.7 of the housing 2.7. A seal 22.7 is also attached between the two shells 12.7 and 13.7. The common center of both radii R₁ and R₂ of the shells 12.7 and 13.7 is the pole 3. To determine the pivoting movement of the shaving head 4.7, only about the spatial axes x and y, ie excluding a pivoting movement about the vertical axis Z or shaving head axis of symmetry 10, are between the Shells 12.7 and 13.7 acting, form-fitting guides are provided, which are described below in connection with Figures 8, 9 and 10. The centerpiece of these guides is a coupling part 23, which has on its longitudinal sides 24 two parallel ribs 25 and 26, on the center of which, transversely to this, are placed two blocks 27 and 28 which project outwards and which act as Guide elements transverse to the guide direction of the ribs 25 and 26 are used. In the middle of the coupling part 23 there is a cutout 29 for the motor 15.7, which is dimensioned such that it closely encloses the motor with the longitudinal sides 24, ie parallel to the ribs 25 and 26, while between the transverse sides 30, ie parallel to the blocks 27 and 28 and the corresponding dimensions of the motor 15.7 a game is provided which allows a relative movement of the motor 15.7 relative to the coupling part 23 within the selected pivoting movement of the shaving head 4.7. In the spherical shell 12.7 of the shaving head 4.7, a central recess 31 with the dimensions of the motor cross section (see FIG. 8) and slot-like recesses 32, 33 for the ribs 25, 26 and recesses 34, 35 for the blocks 27, 28 are provided. FIG. 9 shows these relationships in a top view with a view of the concave side of the spherical shell 12.7 when the coupling part 23 is inserted in a schematic representation. Correspondingly, in the bearing shell 13.7 of the housing 2.7 there is a central recess 36 for the motor 15.7, which has such an excess compared to its cross-sectional dimensions that the motor 15.7 can move freely in the direction of the x- and y-space axes when the shaving head is pivoted . This recess 36 is adjoined on both sides - as shown in FIG. 9 - in the middle of its longitudinal edges by recesses 37 and 38 (FIG. 8) which are made transversely to the direction of the ribs 25 and 26. The blocks 27, 28 engage in these recesses 37 and 38 for the purpose of guiding the pivoting movement of the shaving head 4.7 about the y-spatial axis. Its length is determined according to the chosen dimension of the swing movement. For assembly, the coupling part 23 is pushed onto the motor 15.7 before it is fastened in the shaving head 4.7 until the ribs 25, 26 engage in their recesses serving as guides and the blocks 27, 28 pass through the recesses 34, 35 to engage in them assigned, serving as a guide recesses 37, 38 come to rest in the bearing shell 13.7. Ver tension of the shaving head 4.7 with the bearing shell 13.7 of the housing 2.7 also serves here a sleeve 39 which can be screwed onto the motor 15.7 and presses against the convex side of the bearing shell 13.7 via a slide bearing part 40. The narrow sides of the slot-like recesses serve as stops to limit the pivoting movements of the shaving head.

Bei dem in Fig. 11 dargestellten Ausführungsbeispiel eines Trockenrasierapparates ist eine Schwenkbewegung nur um eine durch den Pol 3 gehende Raumachse, die x-Achse, vorgesehen. Die Be­wegungen um die y- und z-Raumachse sind gesperrt. Der konstruktive Aufbau entspricht sonst dem Ausführungsbeispiel in Fig. 1. Der Pol 3 liegt im Kreuzungspunkt der Scherkopfsymmetrieachse 10 mit der Scherebene E, die durch die Oberfläche der Schersysteme 5 bestimmt ist. Im Scherkopf 4 ist der Elektromotor 15 zum Antrieb der Scher­systeme 5 befestigt und durchdringt die als Kugelschale 12 ausge­bildete Unterseite des Scherkopfes 4 in der Aussparung 41 und die kugelkalottenartig ausgebildete Lagerschale 13 des Gehäuses 2 in der Aussparung 42; diese ist in Schwenkrichtung des Scherkopfes 4 und damit des Motors 15 um ein solches Maß gegenüber den Quer­schnittsmaßen des Motors 15 erweitert, daß sich der Motor 15 in dieser Richtung frei bewegen kann. An der Konvexseite der Kugel­schale 12 sind beiderseits der Aussparung 41 für den Motor 15 zwei Rippen 43 angebracht - in Fig. 11 ist nur eine Rippe 43 zu sehen -, die in zwei entsprechend angeordneten und um das notwen­dige Bewegungsspiel für den Scherkopf 4 verlängerte Führungs­schlitze 44 eingreifen. Auch hier ist der Motor 15 von einem tellerartigen Gleitlagerteil 18 umgeben, das von einer auf den Motor 15 aufschraubbaren Hülse 20 in gleitbarer Anlage mit der Konvexseite der Lagerschale 13 gehalten ist. Wie schon in Fig. 1 dargestellt, ist eine Dichtung 22 zwischen Scherkopf 4 und Gehäuse 2 vorgesehen. Die Radien R₁ der Kugelschale 12 und R₂ der Lagerschale 13 haben ihren gemeinsamen Ausgangspunkt im Pol 3.In the exemplary embodiment of a dry shaving apparatus shown in FIG. 11, a pivoting movement is provided only about a spatial axis passing through the pole 3, the x-axis. The movements around the y and z spatial axes are blocked. The structural design otherwise corresponds to the exemplary embodiment in FIG. 1. The pole 3 lies at the point of intersection of the shaving head axis of symmetry 10 with the shear plane E, which is determined by the surface of the shear systems 5. The electric motor 15 for driving the shaving systems 5 is fastened in the shaving head 4 and penetrates the underside of the shaving head 4, which is designed as a spherical shell 12, in the recess 41 and the spherical cap-shaped bearing shell 13 of the housing 2 in the recess 42; this is widened in the pivoting direction of the shaving head 4 and thus of the motor 15 by such an amount compared to the cross-sectional dimensions of the motor 15 that the motor 15 can move freely in this direction. On the convex side of the spherical shell 12 there are two ribs 43 on both sides of the cutout 41 for the motor 15 - only one rib 43 can be seen in FIG. 11 - which are arranged in two guide slots 44 which are arranged accordingly and are extended by the necessary play for the shaving head 4 intervention. Here, too, the motor 15 is surrounded by a plate-like slide bearing part 18, which is held in a slidable contact with the convex side of the bearing shell 13 by a sleeve 20 which can be screwed onto the motor 15. As in Fig. 1 a seal 22 is provided between the shaving head 4 and the housing 2. The radii R₁ of the spherical shell 12 and R₂ of the bearing shell 13 have their common starting point in pole 3.

Einen abweichenden, konstruktiven Aufbau eines elektrisch ange­triebenen Trockenrasierapparates 45 zeigt Fig. 12. Dessen Gehäuse 46 trägt an seinem oberen Ende zwei abgewinkelte Wangen 47 und 48, zwischen denen der Scherkopf 49 um eine waagerechte Achse 50 schwenkbar gelagert ist. Die Schersysteme 5 sind zum Scherkopf in der in Fig. 4 dargestellten Weise angeordnet, d.h. die Achse 50 ist identisch mit der Raumachse x und geht durch den zwischen den beiden Schersystemen 5 liegenden Pol 3, der praktisch in der Scherebene E liegt. Der Antriebsmotor 51 ist im Scherkopf 49 an einer Antriebsplatte 52 befestigt; die getriebliche Verbindung zu den Schersystemen ist der Übersichtlichkeit halber nicht darge­stellt. Zur Aufnahme des Motors 51 ist das Gehäuse des Scherkopfs 49 nach unten verlängert und das Apparate-Gehäuse 46 entsprechend ausgespart. Will man diese Gestaltung vermeiden, bietet es sich an, den Motor fest im Gehäuse 46 zu installieren und die Scher­systeme 5 über eine geeignete, gelenkige Verbindung anzutreiben, z.B. eine biegsame Welle, eine Welle mit Kardangelenken oder Ke­gelradgetrieben, wie dies an sich bekannt ist.

  • 1 Rasierapparat 1.7
  • 2, 2.7 Gehäuse
  • 3 Pol
  • 4,4.3,4.4 Scherkopf 4.5,4.6,4.7
  • 5 Schersysteme
  • 6 Obermesser
  • 7 Untermesser
  • 8 Rotationsachsen
  • 9 Außenoberfläche
  • 10 Scherkopfsymmetrieachse
  • 11 Scherkopfgehäuse
  • 12, 12.7 Kugelschale
  • 13, 13.7 Lagerschale
  • 14 Halterung
  • 15,15.7 Elektromotor
  • 16 Getriebe
  • 17 Öffnung in 13
  • 18 Gleitlagerteil
  • 19 Innenwand von 13
  • 20 Hülse
  • 21 Anschlag
  • 22, 22.7 Dichtung
  • 23 Kupplungsteil
  • 24 Längsseiten
  • 25 Rippe
  • 26 Rippe
  • 27 Block
  • 28 Block
  • 29 Aussparung in 23 K Kreis der Taumelbewegung E Scherebene R₁ Radius Kugelschale 12 R₂ Radius von Lagerschale 13 α Ausschlagwinkel der Taumelbewegung von Achse 10 x y z Raumachsen
  • 30 Querseite
  • 31 Aussparung in 12.7
  • 32 Ausnehmungen in 12.7
  • 33 Ausnehmungen in 12.7
  • 34 Ausnehmungen in 12.7
  • 35 Ausnehmungen in 12.7
  • 36 Aussparung in 13.7
  • 37 Ausnehmungen in 13.7
  • 38 Ausnehmungen in 13.7
  • 39 Hülse
  • 40 Gleitlager
  • 41 Aussparung in 12, Fig. 11
  • 42 Aussparung in 13, Fig. 11
  • 43 Rippen an 12
  • 44 Führungsschlitze in 13
  • 45 Rasierapparat Fig. 12
  • 46 Gehäuse Fig. 12
  • 47 Wangen Fig. 12
  • 48 Wangen Fig. 12
  • 49 Scherkopf Fig. 12
  • 50 Achse Fig. 12
  • 51 Elektromotor Fig. 12
  • 52 Antriebsplatte Fig. 12
FIG. 12 shows a different, constructive structure of an electrically driven dry shaving apparatus 45. Its housing 46 has at its upper end two angled cheeks 47 and 48, between which the shaving head 49 is pivotably mounted about a horizontal axis 50. The shaving systems 5 are arranged in relation to the shaving head in the manner shown in FIG. 4, ie the axis 50 is identical to the spatial axis x and passes through the pole 3 lying between the two shaving systems 5, which lies practically in the shear plane E. The drive motor 51 is fastened in the shaving head 49 to a drive plate 52; the gear connection to the shear systems is not shown for the sake of clarity. To accommodate the motor 51, the housing of the shaving head 49 is extended downward and the apparatus housing 46 is recessed accordingly. If you want to avoid this design, it makes sense to install the motor firmly in the housing 46 and to drive the shaving systems 5 via a suitable, articulated connection, for example a flexible shaft, a shaft with cardan joints or bevel gear drives, as is known per se.
  • 1 razor 1.7
  • 2, 2.7 housing
  • 3 pin
  • 4,4.3,4.4 shaving head 4.5,4.6,4.7
  • 5 shaving systems
  • 6 upper knives
  • 7 lower knives
  • 8 axes of rotation
  • 9 outer surface
  • 10 shaving head symmetry axis
  • 11 shaving head housing
  • 12, 12.7 spherical shell
  • 13, 13.7 bearing shell
  • 14 bracket
  • 15, 15.7 electric motor
  • 16 gears
  • 17 opening in 13
  • 18 plain bearing part
  • 19 inner wall of 13
  • 20 sleeve
  • 21 stop
  • 22, 22.7 seal
  • 23 coupling part
  • 24 long sides
  • 25 rib
  • 26 rib
  • 27 block
  • 28 block
  • 29 recess in 23 K circle of wobble movement E shear plane R₁ radius spherical shell 12 R₂ radius of bearing shell 13 α deflection angle of the wobble movement of axis 10 xyz spatial axes
  • 30 short side
  • 31 recess in 12.7
  • 32 recesses in 12.7
  • 33 recesses in 12.7
  • 34 recesses in 12.7
  • 35 recesses in 12.7
  • 36 recess in 13.7
  • 37 recesses in 13.7
  • 38 recesses in 13.7
  • 39 sleeve
  • 40 plain bearings
  • 41 recess in 12, FIG. 11
  • 42 recess in FIG. 13, FIG. 11
  • 43 ribs on 12
  • 44 guide slots in 13
  • 45 Shaver Fig. 12
  • 46 housing Fig. 12
  • 47 cheeks Fig. 12
  • 48 cheeks Fig. 12
  • 49 shaving head Fig. 12
  • 50 axis Fig. 12
  • 51 electric motor Fig. 12
  • 52 drive plate Fig. 12

Claims (13)

1. Trockenrasierapparat (1) mit einem Gehäuse (2, 2.7), einem be­wegbar gelagerten Scherkopf (4), in dem wenigstens ein Scher­system (5) mit einem kreisrunden Obermesser (6) und einem rotierenden Untermesser (7) vorgesehen ist, dessen Rotations­achse (8) rechtwinklig zu einer parallel zur Außenoberfläche (9) des Obermessers (6) verlaufenden Scherebene (E) ausgerich­tet ist, und mit einer die Scherebene (E) im geometrischen Flächenmittelpunkt des bzw. der vorgesehenen Schersysteme (5) rechtwinklig schneidenden Scherkopfsymmetrieachse (10), dadurch gekennzeichnet, daß der geometrische Flächenmittel­punkt als ruhender Pol (3) für die mit der Scherebene (E) in beliebiger Richtung bewegbare Scherkopfsymmetrieachse (10) vorgesehen ist.1. dry shaving apparatus (1) with a housing (2, 2.7), a movably mounted shaving head (4), in which at least one shaving system (5) with a circular upper knife (6) and a rotating lower knife (7) is provided, the axis of rotation of which (8) is aligned at right angles to a shear plane (E) running parallel to the outer surface (9) of the upper knife (6), and with a shaving head symmetry axis (10) that cuts the shear plane (E) at the geometric center of the surface of the shear system (s) (5) provided ), characterized in that the geometric center of the surface is provided as a stationary pole (3) for the shaving head symmetry axis (10) which can be moved in any direction with the shear plane (E). 2. Trockenrasierapparat nach Anspruch 1, dadurch gekennzeichnet, daß die Scherebene (E) und die Scherkopfsymmetrieachse (10) gemeinsam um drei durch den Pol (3) verlaufende, rechtwinklig zueinander gerichtete Raumachsen (x, y, z) bewegbar sind.2. Dry shaving apparatus according to claim 1, characterized in that the shear plane (E) and the shaving head axis of symmetry (10) are movable together about three through the pole (3), perpendicular to each other directed spatial axes (x, y, z). 3. Trockenrasierapparat nach Anspruch 1 oder 2, dadurch gekenn­zeichnet, daß die gemeinsame Bewegung von Scherebene (E) und Scherkopfsymmetrieachse (10) mittels am Scherkopf (4) und am Gehäuse (2) vorgesehener Anschläge (21) begrenzbar ist.3. Dry shaver according to claim 1 or 2, characterized in that the common movement of the shear plane (E) and shaving head symmetry axis (10) by means of the shaving head (4) and the housing (2) provided stops (21) can be limited. 4. Trockenrasierapparat nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß das Gehäuse (11) des Scherkopfes (4) wenigstens teilweise als Kugelschale (12, 12.7) ausgebildet ist, die in einer im Gehäuse (2) des Rasierapparates (1) vor­gesehenen, kugelkalottenartig ausgebildeten Lagerschale (13, 13.7) schwenkbar gelagert ist.4. Dry shaver according to one of claims 1 to 3, characterized in that the housing (11) of the shaving head (4) is at least partially designed as a spherical shell (12, 12.7) which in a in the housing (2) of the shaving apparatus (1) provided, spherical cap-shaped bearing shell (13, 13.7) is pivotally mounted. 5. Trockenrasierapparat nach den Ansprüchen 1, 2 oder 4, dadurch gekennzeichnet, daß der gemeinsame Mittelpunkt der Radien (R₁, R₂) der Kugelschale (12, 12.7) und der Lagerschale (13, 13.7) im Pol (3) liegt.5. Dry shaver according to claims 1, 2 or 4, characterized in that the common center of the radii (R₁, R₂) of the spherical shell (12, 12.7) and the bearing shell (13, 13.7) lies in the pole (3). 6. Trockenrasierapparat nach den Ansprüchen 1 und 4, dadurch gekennzeichnet, daß das Gehäuse (11) des Scherkopfes (4) eine Halterung (14) aufweist, an der ein Elektromotor (15) als An­trieb für das oder die Schersysteme (5) koaxial zur Scherkopf­symmetrieachse (10) montiert ist, der mit seinem freien Ende durch eine Öffnung (17) in der Lagerschale (13) in das Innere des Apparategehäuses (2) ragt, daß auf das freie Ende des Motors eine Hülse (20) aufschraubbar ist und daß zwischen Hülse (20) und Lagerschale (13) ein tellerartiges Gleitlager­teil (18) vorgesehen ist, dessen Durchmesser größer ist als der Durchmesser der Öffnung (17) im Lagerteil (13) des Ge­häuses (2), und daß das Gleitlagerteil (18) durch die Hülse (20) in gleitbarer Anlage an der Wand (19) der Lagerschale (13) gehalten ist.6. Dry shaving apparatus according to claims 1 and 4, characterized in that the housing (11) of the shaving head (4) has a holder (14) on which an electric motor (15) as a drive for the shaving system or systems (5) coaxially Shaving head symmetry axis (10) is mounted, which projects with its free end through an opening (17) in the bearing shell (13) into the interior of the apparatus housing (2), that a sleeve (20) can be screwed onto the free end of the motor and that between the sleeve (20) and the bearing shell (13) a plate-like plain bearing part (18) is provided, the diameter of which is larger than the diameter of the opening (17) in the bearing part (13) of the housing (2), and that the plain bearing part (18) through the sleeve (20) is slidably supported on the wall (19) of the bearing shell (13). 7. Trockenrasierapparat nach den Ansprüchen 1 und 4, dadurch gekennzeichnet, daß zwischen der Kugelschale (12, 12.7) und der kugelkalottenartigen Lagerschale (13, 13.7), vorzugsweise in dessen Außenrand, eine ringförmige Dichtung (22, 22.7) vor­gesehen ist.7. Dry shaving apparatus according to claims 1 and 4, characterized in that an annular seal (22, 22.7) is provided between the spherical shell (12, 12.7) and the spherical cap-like bearing shell (13, 13.7), preferably in the outer edge thereof. 8. Trockenrasierapparat nach den Ansprüchen 1 bis 6, dadurch gekennzeichnet, daß der Durchmesser der Öffnung (17, 42) in der Lagerschale (13, 13.7) gegenüber dem Durchmesser des Motors (15, 15.7) ein Übermaß aufweist, das der gewünschten Bewegungsfreiheit des Scherkopfes (4, 4.7) entspricht, wobei der Rand der Öffnung (17, 42) als Anschlag (21) für die Be­wegung des Scherkopfes (4) vorgesehen ist.8. dry shaver according to claims 1 to 6, characterized in that the diameter of the opening (17, 42) in the bearing shell (13, 13.7) compared to the diameter of the motor (15, 15.7) has an excess that the desired freedom of movement of The shaving head (4, 4.7) corresponds, the edge of the opening (17, 42) being provided as a stop (21) for the movement of the shaving head (4). 9. Trockenrasierapparat nach den Ansprüchen 1 bis 8, dadurch gekennzeichnet, daß der Ausschlagwinkel (α) der Schwenkbe­wegung oder Taumelbewegung (K) der Scherkopfsymmetrieachse (10) gemeinsam mit der Scherebene (E) um den ruhenden Pol (3) bis zu ca. 20° beträgt.9. Dry shaver according to claims 1 to 8, characterized in that the deflection angle (α) of the pivoting movement or wobble movement (K) of the shaving head axis of symmetry (10) together with the shear plane (E) around the stationary pole (3) up to about 20 ° is. 10. Trockenrasierapparat nach den Ansprüchen 1 und 2, gekenn­zeichnet durch formschlüssige Führungen (25 bis 28, 32 bis 35, 37, 38, 43, 44) im Bereich der Kugelschale (12, 12.7) des Scherkopfes (4, 4.7) und der Lagerschale (13, 13.7) des Ge­häuses (2, 2.7) in solcher Ausrichtung, daß mindestens eine Schwenkbewegung um die vertikale Raumachse gesperrt ist.10. dry shaving apparatus according to claims 1 and 2, characterized by positive guides (25 to 28, 32 to 35, 37, 38, 43, 44) in the region of the spherical shell (12, 12.7) of the shaving head (4, 4.7) and the bearing shell (13, 13.7) of the housing (2, 2.7) in such an orientation that at least one pivoting movement around the vertical spatial axis is blocked. 11. Trockenrasierapparat nach Anspruch 10, gekennzeichnet durch ein in die Führungen (32 bis 35, 37, 38, 43, 44) der Kugel­schale (12, 12.7) und der Lagerschale (13, 13.7) eingreifendes Kupplungsteil (23).11. Dry shaving apparatus according to claim 10, characterized by a coupling part (23) engaging in the guides (32 to 35, 37, 38, 43, 44) of the spherical shell (12, 12.7) and the bearing shell (13, 13.7). 12. Trockenrasierapparat nach den Ansprüchen 10 und 11, dadurch gekennzeichnet, daß das Kupplungsteil (23) mit sich recht­winklig kreuzenden Rippen (25, 26) und Blöcken (27, 28) ver­sehen ist, daß das Kupplungsteil (23) auf der Konkavseite der Kugelschale (12.7) montierbar ist und mit seinen Blöcken (27, 28) entsprechend bemessene Aussparungen (34, 35) der Kugel­schale (12.7) durchdringend, in Führungen (37, 38) der Lager­schale (13) eingreift.12. Dry shaving apparatus according to claims 10 and 11, characterized in that the coupling part (23) with ribs (25, 26) and blocks (27, 28) crossing at right angles is provided in that the coupling part (23) on the concave side of the spherical shell (12.7) is mountable and penetrates with its blocks (27, 28) correspondingly dimensioned recesses (34, 35) of the spherical shell (12.7), in guides (37, 38) of the bearing shell (13). 13. Trockenrasierapparat nach den Ansprüchen 1 und 2, dadurch gekennzeichnet, daß zwischen Scherkopf (4) und Gehäuseteil nur eine Führung (Rippe 43, Schlitz 44) vorgesehen ist, die eine Schwenkbewegung um eine der beiden in der Scherebene (E) lie­genden Raumachsen (x oder y) ermöglicht, während Bewegungen um die anderen beiden Raumachsen (y) oder (x) bzw. (z) gesperrt sind (Fig. 11).13. A dry shaver according to claims 1 and 2, characterized in that only one guide (rib 43, slot 44) is provided between the shaving head (4) and the housing part, which pivots about one of the two spatial axes lying in the shear plane (E) ( x or y) enables while movements around the other two spatial axes (y) or (x) or (z) are blocked (Fig. 11).
EP89121739A 1988-12-24 1989-11-24 Electric razor with a moving shaving head Expired - Lifetime EP0375949B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3843936 1988-12-24
DE3843936A DE3843936C1 (en) 1988-12-24 1988-12-24

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EP0375949A2 true EP0375949A2 (en) 1990-07-04
EP0375949A3 EP0375949A3 (en) 1991-07-10
EP0375949B1 EP0375949B1 (en) 1994-09-21

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ID=6370290

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Country Status (6)

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US (1) US5007168A (en)
EP (1) EP0375949B1 (en)
JP (1) JP2667267B2 (en)
AT (1) ATE111798T1 (en)
DE (2) DE3843936C1 (en)
ES (1) ES2061899T3 (en)

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US5313704A (en) * 1991-11-18 1994-05-24 U.S. Philips Corporation Electric shaver
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EP2281670A1 (en) * 2009-08-06 2011-02-09 Izumi Products Company Rotary electric shaver
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US9592614B2 (en) 2013-05-16 2017-03-14 Koninklijke Philips N.V. Shaving head with pivotable shaving unit
CN104191439A (en) * 2014-09-03 2014-12-10 上海奔腾电工有限公司 Shaver head mechanism
CN107735231A (en) * 2015-06-08 2018-02-23 芭比丽丝法科私人有限公司 Shaver with the diced system for swinging installation

Also Published As

Publication number Publication date
DE58908409D1 (en) 1994-10-27
EP0375949A3 (en) 1991-07-10
EP0375949B1 (en) 1994-09-21
JPH02213378A (en) 1990-08-24
DE3843936C1 (en) 1990-05-31
ES2061899T3 (en) 1994-12-16
ATE111798T1 (en) 1994-10-15
JP2667267B2 (en) 1997-10-27
US5007168A (en) 1991-04-16

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