ELECTRIC TOOTHBRUSH HANDLE AND ELECTRIC TOOTHBRUSH

Description

State of the art

[0001] The invention relates to an electric toothbrush handle and an electric toothbrush comprising the electric toothbrush handle and a brush head. Brush heads for toothbrush handles, electric toothbrush handles, and electric toothbrushes have already been proposed, as for example in CN 201966781 U, DE 10 2012 006 723 A1, EP 0 893 106 A2, EP 2 234 561 B1, US 9,237,943 B2, US 2002 / 056402 A1, and WO 95 / 33419 A1.

[0002] From US 2011 / 0107536 A1, a brush head for a toothbrush handle is already known, comprising a head section that includes a brush head, a mounting section that includes an interface receptacle, and a neck section arranged between the head section and the mounting section.

[0003] From JP 2012-165954 A, an electric toothbrush handle is already known, comprising at least one interface for coupling with a brush head, at least one housing, at least one drive unit included in the housing for driving the interface, and at least one energy storage device for supplying the drive unit with energy.

[0004] From CN 206 198 074 U, an electric toothbrush handle is already known, comprising at least one housing with at least one drive unit included in the housing, an energy storage device for supplying the drive unit with energy, and a circuit board, wherein the electric toothbrush handle comprises a first frame unit on which the circuit board and the energy storage device are arranged, and wherein the electric toothbrush handle comprises a second frame unit designed separately from the first frame unit, on which the drive unit is arranged.

[0005] WO 2015 / 159250 A1 discloses an electric toothbrush handle with an interface for coupling with a brush head, and with a fixed, one-piece frame unit arranged in a housing, which accommodates a drive unit and an energy storage device in corresponding receiving areas, wherein the frame unit extends axially over the entire drive unit and the entire energy storage device, and wherein a charging coil is attached around connecting tabs on the outside of the proximal end of the frame unit and is in elastic pressure contact with the frame unit by means of a bridge spring.

[0006] The object of the invention is, in particular, to achieve advantageous properties with regard to a variable and / or easy-to-assemble and / or advantageously compact design and / or efficient transmission of motion from the drive to the brush head and / or cost-effective manufacturability and / or high cleaning performance with low risk of injury. This object is achieved according to the invention by the features of claim 1, while advantageous embodiments and further developments of the invention can be found in the dependent claims. Advantages of the invention

[0007] The invention relates to an electric toothbrush handle with at least one interface for coupling with a brush head with at least one housing, with at least one drive unit housed in the housing for driving the interface and with at least one energy storage device for supplying the drive unit with energy. and with a fixed, one-piece frame unit arranged in the housing, which accommodates the drive unit and the energy storage device, wherein the frame unit forms several receiving areas at least for the drive unit and the energy storage device, which are positioned in a defined relative to each other both in a mounted state and in an unmounted state of the frame unit, wherein the frame unit extends axially over the entire drive unit and the entire energy storage device, wherein at least one charging coil for charging the energy storage device is accommodated in the fixed frame unit, wherein a compressible length compensation element is attached for length compensation to absorb tolerances between the charging coil and the frame unit.

[0008] Preferably, the drive unit is formed by a motor. Furthermore, the energy storage device is formed by a rechargeable battery. However, in principle, other configurations of the energy storage device that would appear sensible to a person skilled in the art would also be conceivable, such as a battery. Preferably, the frame unit is designed to accommodate both a single energy storage cell, such as an AA energy storage cell, and three energy storage cells simultaneously, such as three AAA energy storage cells. Preferably, a frame is provided for three energy storage cells, which accommodates the three energy storage cells and fits into a receiving area of ​​the frame unit for each individual energy storage cell.

[0009] In this context, the term "housing" refers specifically to a protective outer shell of the toothbrush handle. Preferably, the housing surrounds a substantial portion of the toothbrush handle. Preferably, the housing also includes a grip area. Preferably, the housing forms the handle of the toothbrush handle. The housing is preferably made of plastic. However, in principle, other materials that would be suitable to a person skilled in the art would also be conceivable. Furthermore, the housing can be either a single piece or, in particular, a two-part shell. Preferably, the housing includes components consisting of at least one hard component, which have a structural support function. Particularly preferably, the housing consists of hard components and soft components, with the soft components forming, in particular, grip surfaces and buttons.Preferably, the soft components form an overmolding of the hard components. Furthermore, in this context, a "fixed frame unit" is understood to mean, in particular, a unit forming a support structure that is manufactured in one piece and / or consists at least exclusively of parts rigidly connected to one another. The fixed frame unit is, in particular, distinct from several separate individual frames. Preferably, the frame unit forms several receiving areas, in particular at least for the drive unit and the energy storage device, which are positioned in a defined manner relative to one another, especially both in an assembled and in an unassembled state of the frame unit. The fixed frame unit is, in particular, intended to form a prefabricated module that can be installed / inserted into the housing in one piece.

[0010] The design of the electric toothbrush handle according to the invention allows for particularly advantageous assembly of the toothbrush handle. Preferably, the frame unit enables pre-assembly of the components. This allows the frame unit to be inserted into the housing completely pre-assembled, thus avoiding assembly errors. Preferably, the wiring of the electric toothbrush handle, especially at least the drive unit and the energy storage device, can be carried out, preferably entirely, outside the housing.

[0011] As defined above, the electric toothbrush handle according to the invention has at least one charging coil for charging the energy storage device, which is located in the fixed

[0012] The frame unit is included. Alternatively, but not according to the invention, a separate frame unit for the charging coil can be formed, which can be mounted to the frame unit. Mounting can involve plugging, screwing, gluing, etc. This separate frame unit for the charging coil, which is not according to the invention, contains the charging coil and a compensating element that is pressed against the energy storage device by the charging coil. This compensates for length tolerances and absorbs impacts, for example, if the toothbrush is dropped. Preferably, the frame unit has a receiving area for a positionally fixed mounting of the charging coil, particularly at least relative to the energy storage device and / or the drive unit. This allows for a particularly advantageously precise alignment of the components of the toothbrush handle relative to each other. Furthermore, this allows for advantageously simple assembly.In particular, it can be achieved that the frame unit can be fully pre-assembled and inserted into the housing. In this context, a "charging coil" is understood to be, in particular, an induction coil for wireless energy transfer. Preferably, a voltage is induced in the charging coil in a charging state by means of a changing magnetic field, by means of which the energy storage device can be charged.

[0013] It is further proposed that the electric toothbrush handle includes a circuit board for controlling the drive unit, which is at least partially positively engaged by the frame unit and extends over at least a large part of the axial extent of the frame unit. Preferably, the circuit board extends over at least 50%, preferably at least 70%, and particularly preferably at least 90% of the axial extent of the frame unit. Preferably, the frame unit has an axial extent of at least 130 mm, preferably at least 140 mm, preferably a maximum of 200 mm, and particularly preferably a maximum of 170 mm. Furthermore, the frame unit has a width of at least 10 mm, preferably at least 13 mm, preferably a maximum of 30 mm, and particularly preferably a maximum of 25 mm.Furthermore, the frame unit has a height of at least 15 mm, preferably at least 18 mm, and preferably a maximum of 35 mm, most preferably a maximum of 28 mm. Preferably, the circuit board is positively locked to the frame unit by means of retaining clips. The circuit board is preferably formed from a printed circuit board (PCB). However, other configurations of the circuit board that would appear advantageous to a person skilled in the art are also conceivable. Preferably, the circuit board forms a control and / or regulating unit and / or an operating unit for the toothbrush handle. The circuit board is specifically designed for connecting and controlling the electrical functional elements of the toothbrush handle. This allows, in particular, the provision of a large-area circuit board. This, in turn, enables a particularly advantageous connection to the circuit board.Preferably, this allows for the complete integration of the electrically functional components into the frame unit. A "control and / or regulation unit" is understood to be, in particular, a unit with at least one control electronics unit. "Control electronics" is understood to be, in particular, a unit with at least one electronic circuit, which preferably consists of voltage and comparator control modules. However, the control electronics can also be more complex, for example, by using a processor unit and a memory unit, as well as an operating program stored in the memory unit.

[0014] Preferably, the frame unit for positively engaging the printed circuit board (PCB) has at least two hook-shaped locking elements designed to partially engage the PCB in a mounted state. Particularly preferably, the PCB has recesses corresponding to these locking elements on an outer edge, allowing it to be moved past the locking elements into a final position for mounting. Preferably, the PCB is placed onto the frame unit in a partially offset position during mounting, with the recesses allowing it to be guided past the locking elements. The PCB is then slid under the locking elements and thereby secured. Preferably, the locking elements also serve as hold-down devices, providing a force-fit connection for the PCB.

[0015] It is further proposed that the drive unit comprises at least one rotor, which includes at least one integral cage element having at least one receiving area for receiving at least one magnet. Preferably, the cage element comprises at least two receiving areas, each designed to receive a magnet. Preferably, the magnets are each formed by a permanent magnet. However, in principle, another design of the magnet that would appear advantageous to a person skilled in the art would also be conceivable. Preferably, the rotor is designed to perform an oscillating motion. Particularly preferably, the rotor is coupled to the interface, preferably to an axis of the interface, which is designed to transmit a drive motion to a brush attachment. This allows for a particularly advantageous rotor to be provided.Preferably, this allows for the provision of a rotor designed for the direct reception of at least one magnet. This allows for a significantly reduced number of components. In this context, a "cage element" is understood to be an element designed for the all-encompassing reception of at least one magnet. Preferably, the cage element forms a receiving area that is completely enclosed by the cage element in at least one plane.

[0016] Furthermore, it is proposed that the cage element has at least one receiving area for the base body comprising at least one magnet and axial extensions arranged on both sides of the base body, forming a rotational axis of the rotor. Preferably, the base body comprises at least two adjacent receiving areas. The axial extensions preferably serve to mount the cage element in the frame unit. Preferably, the base body of the cage element is rotatably mounted on the frame unit via the axial extensions. Particularly preferably, at least one of the axial extensions also serves to transmit a drive movement of the base body to the interface. Preferably, one of the axial extensions is directly coupled to an axis of the interface. This allows for a particularly advantageous mounting of the cage element. Furthermore, the number of components can be kept to a minimum.Furthermore, a conveniently simple and quick assembly of the toothbrush handle can be achieved. In this context, the term "interface axis" refers in particular to a shaft projecting from the housing of the toothbrush handle, which is designed for the direct transmission of a drive movement from the drive unit of the toothbrush handle to the brush head. Preferably, the interface axis is formed by a metal shaft. However, in principle, another design of the axis that would appear sensible to a person skilled in the art would also be conceivable. The cage element is preferably made of a hard component.

[0017] Furthermore, it is proposed that the rotor has at least one metallic cover designed to close the receiving area of ​​the cage element. Preferably, the receiving area of ​​the cage element is open on at least one side, and preferably on at least two opposite sides. More preferably, the rotor has two covers that are connected to the base body of the cage element from opposite sides and conceal the open sides of the receiving areas. The covers are particularly preferably screwed or glued to the cage element. Furthermore, the covers can be fixed with geometric elements, for example, with an insertion geometry at one end and with one or more hook-shaped positive locking elements on the other sides.The fixing with the hook-shaped positive locking elements can also occur only at the end opposite the entry geometry if the covers come to rest in a recess that prevents lateral displacement by its side walls. This allows for a particularly secure and advantageously secure hold of the at least one magnet. Preferably, this also allows for a more precise positioning of the magnet and improved distribution of the magnetic field. Furthermore, it allows for a simple and easy assembly of the toothbrush handle.

[0018] Furthermore, it is proposed that the drive unit has at least one return spring which is fixedly coupled at one end to a first axial extension of the rotor and at the other end is variably fixed to the frame unit via a fixing element. Preferably, the return spring engages at one end in a groove of the first axial extension of the cage element, which extends radially through an axis of rotation of the rotor. Preferably, the return spring is formed by a helical spring. However, other designs of the return spring that would appear advantageous to a person skilled in the art would also be conceivable, such as a spiral spring or leaf spring. This allows for the advantageous achievement of self-resetting of the rotor. In particular, it ensures that the axis of the interface always remains in the same position.This allows for simple, consistent assembly of the brush head, resulting in a high level of user comfort. Furthermore, the return position can be optimally adjusted, thus compensating for production variations. Additionally, readjustment of the initial position is possible, particularly improving the rotor's positioning in its rest position. This also results in a smooth-running drive unit. In this context, a "return spring" refers specifically to a spring element designed to move the rotor back to a defined initial position after rotation. Preferably, the spring element also dampens the rotor's oscillating motion.In particular, the return spring is designed to move the interface axis to its initial position after the drive unit is switched off. Furthermore, in this context, a "fixing element" is understood to mean, in particular, an element designed to fix, or especially clamp, one end of the return spring to a fixed component, such as the frame unit. Preferably, the fixing element is designed to fix the second end of the return spring by pressing the end against the frame unit. Preferably, the second end of the return spring can be fixed in different positions. The phrase "the return spring is variably fixed to the frame unit in a rotationally fixed manner" means, in particular, that the return spring is variably fixed to the frame unit in a rotationally fixed manner, at least with respect to one rotational position.Preferably, this means in particular that the return spring, especially by means of the fixing element, can be fixed to the frame unit in various rotational positions relative to the frame unit in a rotationally fixed manner. In particular, the fixing element can be used to set an entire rotational position of the return spring relative to the frame unit. In particular, an initial position of the rotor relative to the frame unit can be set indirectly.Furthermore, a "spring element" shall be understood to be, in particular, a macroscopic element that has at least an extent and / or a relative rotational position of its ends which, in a normal operating state, is elastically variable by at least 10%, in particular by at least 20%, preferably by at least 30%, and particularly advantageously by at least 50%, and which in particular generates a counterforce that is dependent on and preferably proportional to a change in the extent and / or the relative rotational position, and which opposes the change. The "extent" of an element shall be understood to be, in particular, the maximum distance between two points of a perpendicular projection of the element onto a plane. A "macroscopic element" shall be understood to be, in particular, an element with an extent of at least 1 mm, in particular of at least 5 mm, and preferably of at least 10 mm.

[0019] Alternatively, it is further proposed that the drive unit has a two-part return unit designed to return a rotor to its initial position. Preferably, the return unit is designed to counteract a restoring force on the rotor when it is deflected from its initial position. Preferably, the return unit is designed to move the rotor back to a defined initial position after rotation. It is preferably proposed that the return unit be rotationally fixed to a first axial extension of the rotor and be elastically supported on the frame unit. Furthermore, it is proposed that the return unit has a shaft vane that is mounted directly, and in particular axially, on a first axial extension of the rotor. The return unit, in particular...The wave-shaped vane of the return unit is mounted, with its opening, on a first axial extension of the rotor and thus coupled to it. Preferably, the wave-shaped vane has two opposing vanes extending perpendicular to an axis of rotation, each formed, in particular, by a rectangular extension. The vanes are each equipped with a through-hole. The vanes perpendicular to the axial extension are preferably fixed to the frame unit by means of a spring and damping element. It is preferably proposed that the return unit has an elastic spring and damping element arranged between the wave-shaped vane and the frame unit. The return unit consists, in particular, of the wave-shaped vane and the spring and damping element.Preferably, the shaft vane engages with its opening in a dovetail-shaped cross-section of the first axial extension of the cage element. The return action is preferably provided by the spring and damping element, which engages the shaft vane's wings through through holes or blind holes and rests on the frame element at the other end. The elasticity of the spring and damping element provides the desired return action or springiness. The elastic spring and damping element is designed to generate a restoring force, particularly when the shaft vane deflects from a rest position, especially at least circumferentially. In this context, "shaft vane" refers specifically to a shaft attachment designed for rotationally fixed coupling with a shaft, particularly the rotor of the drive unit.Preferably, the shaft vane has a base body that is at least substantially rotationally symmetrical, on which opposing vanes are arranged to support the base body. Preferably, the shaft vane is at least partially designed to perform a rotary motion. In this context, a "spring and damping element" is understood to be, in particular, an elastic element designed to return the rotor to a defined initial position after rotation. Preferably, the elastic element is also designed to dampen the oscillating motion of the rotor. In particular, the spring and damping element is designed to return the interface axis to an initial position after the drive unit is switched off. This allows, particularly advantageously, the rotor to return to its original position automatically.In particular, it can be ensured that the interface axis always remains in the same position. This allows for simple, consistent mounting of the brush head, resulting in a high level of user convenience. Preferably, the spring and damping element is also designed to dampen the oscillating movement of the rotor. Specifically, the return unit is designed to move the interface axis to its initial position after the drive unit is switched off. With this arrangement, the rotational position cannot be adjusted.

[0020] Furthermore, it is proposed that the elastic spring and damping element be rigidly connected to the shaft vane. Preferably, the elastic spring and damping element is rigidly connected to the shaft vane via a plug connection. The elastic spring and damping element and the shaft vane form the return unit, wherein the return unit, in particular, rests only against the frame unit. The shaft vane rests against the frame unit, in particular, via the spring and damping element. It is further proposed that the elastic spring and damping element, in a mounted state, has a preload relative to the frame unit, wherein the frame unit forms a bearing surface for the spring and damping element. Preferably, the elastic spring and damping element consists at least partially of a soft component, in particular of silicone, while the shaft vane consists of a hard component.Preferably, it is proposed that the elastic spring and damping element consist at least partially of a soft component, in particular silicone, with a Shore A hardness of 25 to 75, preferably 35 to 65. Furthermore, it is proposed that the elastic spring and damping element be designed to limit the rotation of the shaft vane to a rotation angle of 2° to 10°, preferably 3° to 7°. This allows for the advantageous achievement of self-centering of the rotor. Moreover, the number of components required for the centering mechanism and the assembly effort can be minimized.

[0021] The shaft vane, viewed from above, has a cross shape. At its center, the shaft vane features an approximately cylindrical base body with a blind hole and a rotational engagement contour extending axially. This blind hole with the rotational engagement contour serves to secure the rotor's axial extension in a rotationally fixed manner. An extension is preferably formed on the base body in the axial direction opposite the blind hole, preventing axial displacement within the assembly when mounted. A locking device is preferably provided to secure the shaft vane to the rotor's axial extension. The shaft vane extension preferably has a diameter of 1.5 mm to 5 mm, more preferably 2.5 mm to 3.5 mm. The extension is preferably 1.5 mm to 5 mm long, more preferably 2.5 mm to 3.5 mm.The blind hole of the wave vane preferably has a depth of 7 mm to 14 mm, more preferably of 9 mm to 12 mm. The width of the wave vane, measured across the vanes, is particularly between 14 mm and 22 mm, more preferably between 17 mm and 19 mm. The outer diameter of the cylindrical body of the wave vane is advantageously between 7 mm and 11 mm, more preferably between 8 mm and 10 mm.

[0022] The spring and damping element is shaped in cross-section, in particular, as a semicircular element with lateral flanges. On its underside, the element preferably has two projections on the flanges, which rest on the frame unit when assembled. Projections are also preferably provided on the upper side, which are formed on the flanges, adjacent to the geometry, for receiving the shaft vane. These projections are preferably designed to be mounted in the through-holes of the shaft vane and to hold the two parts together. The projections preferably have undercuts to accomplish this. The internal geometry of the spring and damping element is specifically adapted to the external geometry of the shaft vane. The geometry is selected such that the necessary partial rotation of the shaft vane is possible. The spring and damping element has a length of, in particular, 4 mm to 8 mm, preferably 5 mm to 6.5 mm.The width perpendicular to this is in particular between 14 mm and 22 mm, preferably between 17 mm and 19 mm. The height – from the curve to the extension – is in particular between 6 mm and 11 mm, preferably between 7.5 mm and 9.5 mm. The extensions on the underside advantageously have a height of 1 mm to 3 mm, preferably between 1.2 mm and 1.8 mm. The extensions 162b, 162b' on the upper side preferably have a height of 1.5 mm to 4 mm, preferably between 2 mm and 3.5 mm. The inner diameter at the spring and damping element 148b is advantageously between 7 mm and 11 mm, preferably between 8 mm and 10 mm. It is further proposed that the drive unit be formed by a vibrating armature motor. Preferably, the vibrating armature motor is driven sinusoidally. This allows, in particular, improved movement of the rotor of the drive unit. In particular, it allows for advantageously smooth movement of the rotor.Furthermore, noise from the drive unit can be reliably avoided. In this context, a "resonating armature motor" is understood to mean, in particular, a drive designed for the electromagnetic generation of a vibrational motion, especially an oscillatory motion. The drive comprises, in particular, a stationary iron core with an excitation coil and a movable rotor, which includes at least one magnet. Preferably, the rotor is held in its rest position by a return spring.

[0023] It is further proposed that the drive unit comprises at least one stator, which includes a one-piece carrier, a laminated core inserted into the carrier, and a coil surrounding the laminated core. Preferably, the laminated core forms the iron core of the stator, while the coil forms the excitation coil of the stator. Preferably, the stator coil is driven sinusoidally during operation. Particularly preferably, the coil and the laminated core are contactless. Preferably, the stator is formed from a prefabricated module that can be installed as a single unit. This allows for a particularly compact and easy-to-assemble stator. In particular, the number of components can be kept to a minimum. Furthermore, this allows for a particularly advantageous modular stator.In this context, a "sheet metal package" is understood to mean, in particular, a package consisting of several sheet metal parts connected to and / or abutting each other. Preferably, the sheet metal parts each have the same shape and are connected closely together in the same orientation to form a package.

[0024] Furthermore, it is proposed that the drive unit support be directly connected to the frame unit and cover at least one side of the drive unit's rotor. Preferably, the drive unit support is screwed directly to the frame unit. However, another type of connection that would appear practical to a person skilled in the art would also be conceivable. Preferably, the drive unit's rotor is received in a receiving area of ​​the frame unit, the receiving area being open preferably on one, and preferably on at least two, sides. The support is specifically designed to close at least one open side of the frame unit's receiving area. Preferably, in an assembled state, the drive unit's rotor is at least partially enclosed by the stator's laminated core. This allows for a toothbrush handle that is particularly easy to assemble.In particular, this allows for a simple and reliable alignment of the stator relative to the rotor during assembly. This helps to avoid assembly errors.

[0025] Furthermore, it is proposed that the electric toothbrush handle has at least one stop element designed to limit the rotation of the drive unit's rotor from a starting position. Preferably, the stop element is designed to limit an oscillating movement of the rotor. More preferably, the stop element serves to ensure a consistent movement of the rotor. Preferably, the stop element is formed by a mechanical stop against which the rotor mechanically abuts when it reaches an end position. This allows for the targeted limitation of the rotor's movement. In particular, this allows for the targeted and defined limitation of the rotor's movement. Specifically, this prevents damage to the return spring, especially due to overloading and / or over-rotation.Furthermore, manual over-rotation of the rotor, for example by an operator, can be avoided by twisting the brush head. In particular, damage to the toothbrush handle can be specifically prevented.

[0026] Furthermore, it is proposed that the at least one stop element is formed by a pin rigidly connected to the rotor of the drive unit, the pin being elastically mounted at one end on the frame unit. Preferably, the pin is inserted radially into an opening in the rotor, in particular in the shaft extension, and more preferably in the second shaft extension. Preferably, the pin is fixed in position on the rotor and projects radially from the rotor. Particularly preferably, the pin is mounted in the frame unit at one end facing the rotor via an elastic sleeve, in particular a rubber sleeve. This allows for the implementation of an advantageously simple stop element. In particular, an advantageously compact stop element can be provided.

[0027] Furthermore, it is proposed to integrate a stop element directly into the shaft vane. The vanes of the shaft vane lie above the spring and damping element, which in turn rests against the frame unit. This arrangement limits the movement of the shaft vane's vane, which corresponds to a limitation of the rotor's movement, since the rotor is directly connected to the shaft vane, or rather, the shaft vane is mounted onto the rotor.

[0028] It is further proposed that the electric toothbrush handle has at least one rotor cover which is firmly connected to the frame unit and, together with the frame unit, serves to support and / or fix a rotor of the drive unit. Preferably, the rotor of the drive unit is received in a receiving area of ​​the frame unit, the receiving area being open on one, and preferably at least two, sides. Preferably, at least one open side of the receiving area of ​​the frame unit is closed by a support of the drive unit, with the rotor cover closing the second open side. Preferably, the rotor cover is screwed to the frame unit. However, another type of connection that would appear practical to a person skilled in the art would also be conceivable.Preferably, both the rotor cover and the frame unit form at least a semicircular axle receptacle for receiving at least one axle extension of the rotor. Preferably, the rotor is mounted directly between the frame unit and the rotor cover. This allows for advantageously simple and quick assembly. In particular, advantageous protection and mounting of the rotor can be provided. Furthermore, advantageously quick and precise installation of the rotor can be ensured. Preferably, the rotor cover and the frame unit also serve to support and / or seal the interface axle. The axle is preferably mounted via a seal in an axle receptacle, which is composed of a semicircular axle receptacle in the frame unit and a semicircular axle receptacle in the rotor cover.

[0029] It is further proposed that at least one stop element be integrally formed with the rotor cover. Preferably, the stop element forms an integral extension with the rotor cover, facing the rotor. Preferably, the shape of the extension is adapted to the end positions of the rotor. Preferably, the stop element is formed by a recess in the rotor cover. This allows for the creation of an advantageously simple stop element. In particular, an advantageously easy-to-install stop element can be provided. Furthermore, an advantageously robust and easy-to-manufacture stop element can be provided. Preferably, a separate stop element can be dispensed with. In particular, only one shape of the rotor cover needs to be adapted.

[0030] The handpiece or axis 110 is operated in at least one operating state at a frequency of 200 Hz to 320 Hz, preferably 240 Hz to 280 Hz. The deflection angle of the axis 110 per side of the zero position is in particular in a range of 2.5° to 9°, preferably 4° to 7°.

[0031] Furthermore, the invention relates to a method for manufacturing the electric toothbrush handle.

[0032] Furthermore, the invention relates to an electric toothbrush with the electric toothbrush handle and with the brush head.

[0033] In this context, the terms "axial" and "radial" refer specifically to a principal axis of extension of the brush head and / or the electric toothbrush handle, such that the term "axial" specifically denotes a direction that runs parallel or coaxial to one of the principal axes of extension. Furthermore, the term "radial" in the following specifically denotes a direction that runs perpendicular to one of the principal axes of extension. Preferably, the principal axis of extension of the brush head runs parallel to the principal axis of extension of the electric toothbrush handle. A "principal axis of extension" of an object is understood to be, in particular, an axis that runs parallel to a longest edge of the smallest geometric cuboid that just completely encloses the object and, in particular, intersects a geometric center point of the object.

[0034] Furthermore, the terms "top" or "front" of the toothbrush, in this context, should be understood to refer specifically to the side of the toothbrush on which the thumb rests. The top or front is also normally the side towards which the bristle field, particularly of the brush head of the brush head, is directed. The "bottom" or "back" of the toothbrush should be understood to refer specifically to the side facing away from the bristle field of the brush head. Furthermore, the terms "left side" and "right side" each refer to a view of the front. The "bottom of the brush head" refers to the side that is placed in the recess of the base and faces the underside of the toothbrush. Similarly, the "top of the brush head" faces the top of the toothbrush.

[0035] The electric toothbrush handle, the electric toothbrush, and the method according to the invention are not limited to the application and embodiment described above. In particular, the electric toothbrush handle, the electric toothbrush, and the method according to the invention may, to achieve a functionality described herein, comprise a different number of individual elements, components, and units than that specified herein. Drawings

[0036] Further advantages become apparent from the following description of the drawings. The drawings illustrate two exemplary embodiments. The drawings, the description, and the claims contain numerous features in combination. Naturally, the embodiments shown in this document are merely examples. Within the scope of the invention, the individual features and elements of these embodiments can be combined with other embodiments without departing from the scope of this invention.

[0037] The in the Figures 1 to 39 as well as the Figures 45 to 52 The brush heads shown are not according to the invention and serve only for illustration purposes. Figures 53-59 show an alternative toothbrush handle which is not part of the claimed invention. They show:

[0038] Fig. 1 a brush head with a brush head and an interface receptacle in a first 3D view, Fig. 2 the brush head with the interface receptacle in a second 3D view, Fig. 3 the brush head in a third 3D view, Fig. 4 the brush head with the brush head in a front top view, Fig. 5 the brush head with the brush head in a side top view, Fig. 6 the brush head in a rear top view, Fig. 7 the brush head in a top view along a longitudinal axis towards the interface receptacle, Fig. 8 the brush head in a top view along a longitudinal axis towards the brush head, Fig. 9 the brush head in a longitudinal section view along section line IX-IX, Fig. 10 the brush head in a longitudinal section view along section line XX, Fig. 11 the brush head in a cross-sectional view along section line XI-XI, Fig.12 the brush head in a cross-sectional view along section line XII-XII, Fig. 13 the brush head in a cross-sectional view along section line XIII-XIII, Fig. 14 the brush head in a cross-sectional view along section line XIV-XIV, Fig. 15 the brush head in a cross-sectional view along section line XV-XV, Fig. 16 a toothbrush handle with a housing and with an interface in a front view, Fig. 17 the toothbrush handle with the housing and with the interface in a side view, Fig. 18 the toothbrush handle with the housing and with the interface in a rear view, Fig. 19 an electric toothbrush with the electric toothbrush handle and with the brush head in a first 3D view, Fig. 20 the electric toothbrush with the electric toothbrush handle and with the brush head in a second 3D view, Fig.21 The electric toothbrush with the electric toothbrush handle and with the brush head in a top view from the front, Fig. 22 The electric toothbrush with the electric toothbrush handle and with the brush head in a partial sectional view from the side, Fig. 23 The brush head with a first bristle field arrangement in a top view from the side, Fig. 24 The brush head of the brush head with an alternative second bristle field arrangement in a top view from the front, Fig. 25 The brush head of the brush head with an alternative third bristle field arrangement in a top view from the front, Fig. 26 The brush head of the brush head with an alternative fourth bristle field arrangement in a top view from the front, Fig. 27 The brush head of the brush head with an alternative fifth bristle field arrangement in a top view from the front, Fig.28. The brush head of the attachment brush with an alternative sixth bristle field arrangement in a front top view, Fig. 29. The brush head of the attachment brush with an alternative seventh bristle field arrangement in a front top view, Fig. 30. The brush head of the attachment brush with an alternative eighth bristle field arrangement in a front top view, Fig. 31. The brush head of the attachment brush with an alternative ninth bristle field arrangement in a front top view, Fig. 31b. The brush head of the attachment brush with the alternative ninth bristle field arrangement in a 3D view, Fig. 32. The brush head of the attachment brush with an alternative tenth bristle field arrangement in a front top view, Fig. 32b. The brush head of the attachment brush with the alternative tenth bristle field arrangement in a 3D view, Fig. 33. The brush head of the attachment brush with an alternative eleventh bristle field arrangement in a front top view, Fig.33b the brush head of the attachment brush with the alternative eleventh bristle field arrangement in a 3D view, Fig. 34aden brush head of the attachment brush with an alternative twelfth bristle field arrangement in a front top view, Fig. 34bden brush head of the attachment brush with the alternative twelfth bristle field arrangement in a 3D view, Fig. 35aden brush head of the attachment brush with an alternative thirteenth bristle field arrangement in a front top view, Fig. 35bden brush head of the attachment brush with the alternative thirteenth bristle field arrangement in a 3D view, Fig. 36den brush head of the attachment brush with an alternative fourteenth bristle field arrangement in a front top view, Fig. 37den brush head of the attachment brush with an alternative fifteenth bristle field arrangement in a front top view, Fig. 38den brush head of the attachment brush with an alternative sixteenth bristle field arrangement in a front top view, Fig.39 the brush head of the brush head with an alternative seventeenth bristle field arrangement in a front view, Fig. 40 a part of the toothbrush handle according to the invention with a frame unit, with an energy storage device, with a drive unit and with the interface in a first 3D view, Fig. 41 the part of the toothbrush handle according to the invention with the frame unit, with the energy storage device, with the drive unit and with the interface in a second 3D view, Fig. 42 the part of the toothbrush handle according to the invention with the frame unit, with the energy storage device, with the drive unit and with the interface in an exploded view in the first 3D view, Fig. 43 the part of the toothbrush handle according to the invention with the frame unit, with the energy storage device, with the drive unit and with the interface in an exploded view in the second 3D view, Fig.44 a part of the toothbrush handle according to the invention with the frame unit, with an alternative energy storage device, with the drive unit and with the interface in a third 3D view, Fig. 45 an alternative brush head in a top view along a longitudinal axis to the interface receptacle, Fig. 46 the alternative brush head in a longitudinal section view according to section line IX-IX according to . Figure 8 of the first embodiment, Fig. 47 the alternative attachment brush in a longitudinal section view according to section line XX according to Figure 8of the first embodiment, Fig. 48 the alternative brush head in a cross-sectional view along section line XLVIII-XLVIII, Fig. 49 the alternative brush head in a cross-sectional view along section line XLIX-XLIX, Fig. 50 the alternative brush head in a cross-sectional view along section line LL, Fig. 51 the alternative brush head in a cross-sectional view along section line LI-LI, Fig. 52 the alternative brush head in a cross-sectional view along section line LII-LII, Fig. 53 a part of an alternative toothbrush handle with a frame unit, with an energy storage device, with a drive unit and with the interface and a frame unit of the charging coil in a first 3D view, Fig.54. The part of the alternative toothbrush handle with the frame unit, with the energy storage device, with the drive unit, and with the interface and a frame unit of the charging coil in a second 3D view, Fig. 55. The part of the alternative toothbrush handle with the frame unit, with the energy storage device, with the drive unit, and with the interface and a frame unit of the charging coil in an exploded view in the first 3D view, Fig. 56. The part of the alternative toothbrush handle with the frame unit, with the energy storage device, with the drive unit, and with the interface and a frame unit of the charging coil in an exploded view in the second 3D view, Fig.57. The part of the alternative toothbrush handle with the frame unit, with the energy storage device, with the drive unit which has a return unit consisting of a wave vane and a spring and damping element, with the interface and with a frame unit of the charging coil in a sectional view along LVII - LVII through the wave vane and the spring and damping element, Fig. 58. The wave vane and the spring and damping element of the drive unit of the alternative toothbrush handle in an exploded view in the first 3D view and Fig. 59. The wave vane and the spring and damping element of the drive unit of the alternative toothbrush handle in an exploded view in the second 3D view. Description of the exemplary implementations

[0039] The Figures 1 to 15Figure 10a shows a brush head. The brush head 10a is designed for a toothbrush handle 12a. The brush head 10a is designed for an electric toothbrush handle 12a. The brush head 10a is a replaceable brush. The brush head 10a and / or an interface receptacle 20a or interface 24a are generally designed for use with electric toothbrushes 90a with a pivoting or vibrating motion. However, the brush head 10a and / or the interface receptacle 20a or interface 24a can also be used for other products, such as manual toothbrushes, especially reusable toothbrushes (e.g., replaceable-head toothbrushes), alternative electric toothbrushes (especially those with translational and / or rotating movements), and attachments for interdental cleaners (especially interdental brushes with twisted bristles) and / or tongue cleaners.

[0040] The following will refer to the Figures 1 to 15 Reference is made to the different views of the brush head 10a. Due to these different views, some elements are not shown in all figures and therefore not labeled with reference symbols in all figures.

[0041] The brush head 10a has a head section 14a. The head section 14a comprises a brush head 16a. The brush head 10a also has a mounting section 18a. The mounting section 18a includes an interface receptacle 20a. Furthermore, the brush head 10a has a neck section 22a arranged between the head section 14a and the mounting section 18a. The head section 14a, the mounting section 18a, and the neck section 22a are each spatial sections of the brush head 10a. The head section 14a, the mounting section 18a, and the neck section 22a are each axial subsections of the brush head 10a. Advantageously, the brush head 10a consists of exactly three sections: the head section 14a, the neck section 22a, and the mounting section 18a. The sections advantageously adjoin each other directly.The head section 14a, the attachment section 18a and the neck section 22a extend together in an axial direction over the entire attachment brush 10a.

[0042] A general shape of the brush head 10a, viewed from the front, transitions from a greater width in the attachment section 18a to a narrowing in the neck section 22a, and then to a greater width in the head section 14a. The brush head 16a of the brush head 10a has a narrow, elongated base. Viewed from the front, the brush head 16a of the brush head 10a is essentially elliptical. From the side, the brush head 16a has a constant thickness. However, it would also be conceivable for the brush head 16a to have a contoured shape from the side, such as a wave-like form or an increasing thickness towards the neck. Furthermore, additional functional elements, such as a tongue cleaner, can influence this dimension of the brush head 16a. The brush head 16a, free of bristles, has a height of 3 mm to 9 mm, preferably 4 mm to 6 mm. The brush head 16a is free of sharp edges.The brush head 10a is also shaped with a substantially rotational symmetry in the neck section 22a and the attachment section 18a, with a smooth transition occurring towards the head section 14a, at which point the rotational symmetry is lost. The transition between the neck section 22a and the head section 14a preferably occurs via a waist, which forms a minimal diameter for the brush head 10a. Alternatively, however, a shape without a waist would also be conceivable. The consequence of this is that the head section 14a has a more massive, less elegant appearance and is less distinct from the neck section 22a. The brush head 10a is conical in the neck section 22a, with the diameter increasing towards the attachment section 18a.In the attachment section 18a, the conical shape of the neck section 22a is continued, with the brush head 10a also having a concave conical shape towards a free end in the attachment section 18a. In front of a free end facing away from the brush head 16a, the brush head 10a has a short, frustoconical cut, which forms a chamfer and through which a drip edge 108a is formed. The drip edge 108a forms a sharp transition from the chamfer to the rounded surface of the outer skin. The drip edge 108a forms a radially outermost edge of the brush head 10a. The chamfer, measured as the surface normal to the longitudinal axis, has an angle of 30° to 70°, preferably 40° to 60°. Furthermore, the drip edge 108a, viewed in the axial direction, has a distance of 0.5 mm to 4 mm, preferably 1 mm to 3 mm, from the base surface.Furthermore, the drip edge 108a has a diameter of 12 mm to 20 mm, preferably 14 mm to 18 mm. This design allows both geometrically larger and narrower handles to be attractively coupled to the brush head 10a. With wider handles, the drip edge 108a and the chamfer form a finished edge, while with narrow handles, the drip edge 108a and the chamfer create a transition. The drip edge 108a also serves the function of allowing liquid to drip off advantageously when the brush head 10a is placed on a surface. Additionally, the drip edge 108a reduces the amount of liquid that runs towards the surface and, consequently, less liquid flows towards the interface 24a when the brush head is mounted.

[0043] The base is formed at a free end of the attachment section 18a, facing away from the brush head. A base body 26a of the attachment brush 10a forms the base. The base is formed by an annular surface of the base body 26a, which is arranged around the longitudinal axis. The surface has a width of 0.5 mm to 2 mm, preferably 0.7 mm to 1.5 mm. Furthermore, the outer diameter of the base is 9 mm to 17 mm, preferably 11 mm to 15 mm, and the inner diameter is 7 mm to 15 mm, preferably 9 mm to 13 mm. The base allows the attachment brush 10a to be placed on a flat surface, such that a main extension direction 98a of the attachment brush 10a extends substantially perpendicular to the surface.Whether the base can effectively perform its function depends on various factors that influence the center of gravity, such as the design of the bristle field 43a, in particular the bristle length, and / or a mass distribution in the body.

[0044] The brush head 10a has an axial length of 50 mm to 110 mm, preferably 70 mm to 90 mm. Furthermore, the brush head 10a has a width of 7 mm to 16 mm, preferably 10 mm to 14 mm, in the head section 14a. In the neck section 22a, the brush head 10a has a width of 3 mm to 8 mm, preferably 5 mm to 7 mm. In the attachment section 18a, the brush head has a width of 12 mm to 20 mm, preferably 14 mm to 18 mm.

[0045] Furthermore, the brush head 10a has a supporting base body 26a. The supporting base body 26a has a hard component. The supporting base body 26a consists of a hard component. In principle, however, it would also be conceivable for the base body to consist of several different hard components. In particular, this would allow different properties to be achieved at different parts of the base body 26a with the different components. For example, the interface receptacle 20a could be made of a material suitable for good design and properties of the interface receptacle 20a, while the actual head section 14a consists of a second material that is more resistant to chemical oral hygiene products such as toothpaste. Alternatively, plastics of different densities or specific masterbatches with different densities can be used. For vibrating toothbrushes such as sonic, ultrasonic, etc.The weight distribution on the product can be extremely relevant for the propagation of vibrations. For example, components of the base body 26a, or other components, could be made with high density to increase the weight and thus optimize vibration. Furthermore, a certain weight distribution can be achieved by incorporating heavy areas to obtain optimal vibration. For example, a ring can be injected invisibly from a second heavy hard material, particularly 2K injection molded, preferably even internally. Three hard components and / or a combination with soft components are also conceivable. The supporting base body 26a forms a supporting structure for the brush attachment 10a. The supporting base body 26a forms a supporting structure for the brush head 16a. Furthermore, the supporting base body 26a forms a supporting boundary for the interface receptacle 20a.Furthermore, the brush head 16a is essentially rigidly coupled to the interface receptacle 20a via the supporting base body 26a. The supporting base body 26a extends from the attachment section 18a, over the neck section 22a, to the head section 14a. The base body 26a is formed in one piece. However, it would also be conceivable that the base body 26a is at least partially interrupted and that the attachment brush 10a, for example, has a movable joint by which the brush head 16a is movably mounted.

[0046] The attachment brush 10a can also be made entirely of hard components or consist only of a base body 26a without overmolding 32a.

[0047] Furthermore, the brush head 10a has an overmolding 32a. The overmolding 32a is made of a material different from the base body 26a. The overmolding 32a includes a soft component. The overmolding 32a consists of a soft component. The overmolding 32a and the base body 26a are manufactured using a multi-component injection molding process. However, another manufacturing process that would appear sensible to a person skilled in the art would also be conceivable. The overmolding 32a covers a substantial portion of an outer surface of the base body 26a. The base body 26a is free of the overmolding 32a in the area of ​​one front surface of the brush head 16a. This facilitates, in particular, the insertion of bristles. However, it would also be conceivable that the brush head 16a is provided with soft elements made from the soft component of the overmolding 32a. Furthermore, the base body 26a is free from overmolding 32a in the area of ​​the interface receptacle 20a.Furthermore, the base body 26a has a support area 92a on the back side of the brush head 26a, which is free of the overmolding 32a. The support area 92a serves in particular to support the brush head 16a when bristles are inserted into the base body 26a and / or when the base body 26a is overmolded. The overmolding 32a would yield in this process and would not allow for precise bristle positioning. Additionally, a tongue cleaner could be implemented on the back side of the brush head 26a. The tongue cleaner can, for example, have nubs and / or lamellae, particularly in circles or as straight or wavy longitudinal or transverse strips, and can be made of a hard component, a soft component, or a combination of hard and soft components. When using soft components, the soft component can, for example, be formed as a ring around the support area 92a.Furthermore, the base body 26a has a logo area 94a in the neck section 22a, which is free of the overmolding 32a. The logo area 94a serves primarily for printing on the base body 26a, for example by pad printing, laser marking, or embossing. Alternatively, the lettering can already be implemented as a lettering insert in the injection mold. The lettering is then applied as a recessed or raised inscription. A secondary function of the logo area 94a is also to provide support for the precise positioning of the base body 26a in the injection mold during the injection of a second component or the soft component for the overmolding 32a.

[0048] The interface receptacle 20a has several partial receptacle areas 36a, 38a, 40a, 96a. The interface receptacle 20a is subdivided into several partial receptacle areas 36a, 38a, 40a, 96a. The interface receptacle 20a has a first, essentially cuboid partial receptacle area 36a. The first partial receptacle area 36a forms a final partial receptacle area of ​​the interface receptacle 20a. The first partial receptacle area 36a is designed to receive a tip of the interface 24a of the toothbrush handle 12a. The first partial receptacle area 36a is designed to receive a front, free axial section of an axis 110a of the interface 24a of the toothbrush handle 12a. The first partial receptacle area 36a forms a partial receptacle area of ​​the interface receptacle 20a facing the brush head 16a. Furthermore, the first essentially cuboid partial recording area 36a has a taper 42a.The first partial intake area 36a tapers radially at the taper 42a from at least one side. The first partial intake area 36a tapers radially at the taper 42a from two opposite sides. The taper 42a is formed by two opposing chamfered shoulders. The cross-section of the first partial intake area 36a decreases in the axial direction towards the brush head 16a. On one side of the taper 42a facing the second partial intake area 38a, the first partial intake area 36a has an axial length of 2 mm to 7 mm, preferably 3.5 mm to 5 mm. On one side of the taper 42a facing away from the second partial intake area 38a, the first partial intake area 36a has an axial length of 5 mm to 11 mm, preferably 7 mm to 9 mm.On the rear side of the first partial recording area 36a, the tapered section 42a facing the second partial recording area 38a has a maximum distance of 0.5 mm to 3 mm, preferably 1 mm to 2 mm, from a longitudinal axis of the brush head 10a. Furthermore, on the rear side of the first partial recording area 36a, the tapered section 42a facing away from the second partial recording area 38a has a maximum distance of 0.8 mm to 1.6 mm, preferably 1.1 mm to 1.4 mm, from a longitudinal axis of the brush head 10a. Finally, on the front side of the first partial recording area 36a, the tapered section 42a facing away from the second partial recording area 38a has a maximum distance of 0.8 mm to 1.6 mm, preferably 1.1 mm to 1.4 mm, from a longitudinal axis of the brush head 10a.The sides of the first partial receiving area 36a have a maximum distance of 0.5 mm to 3 mm, preferably 1 mm to 2 mm, from the longitudinal axis of the brush attachment 10a on the side of the taper 42a facing the second partial receiving area 38a. Furthermore, the sides of the first partial receiving area 36a have a maximum distance of 1 mm to 2 mm, preferably 1.3 mm to 1.7 mm, from the longitudinal axis of the brush attachment 10a on the side of the taper 42a facing away from the second partial receiving area 38a. The first partial receiving area 36a has a certain degree of "tightness" due to the necessary demoldability during manufacturing, particularly injection molding. The clamping of the axis 110a takes place in the first partial receiving area 36a. However, the axis 110a does not rest completely on it, as complementary geometries with an air gap between them are formed.For example, when viewed in a cross-section, the axis has a round geometry which is arranged in a square part of the interface geometry.

[0049] Furthermore, the interface receptacle has a second, essentially cylindrical partial receptacle area 38a. The second partial receptacle area 38a projects axially, at least partially, into the first partial receptacle area 36a. The second partial receptacle area 38a is arranged to completely overlap the first partial receptacle area 36a axially. The second partial receptacle area 38a is arranged axially completely within the first partial receptacle area 36a. The second partial receptacle area 38a is located at an end of the first partial receptacle area 36a facing away from the end of the interface receptacle 20a. The second partial receptacle area 38a is closed off on a side facing the opening of the interface receptacle 20a together with the first partial receptacle area 36a. A maximum cross-section of the second partial receptacle area 38a perpendicular to a principal extension direction 98a of the brush attachment 10a is larger than a corresponding maximum cross-section of the first partial receptacle area 36a.The first partial recording area 36a is eccentric relative to the second partial recording area 38a. The first partial recording area 36a projects axially through the second partial recording area 38a with at least two edges in an overlapping area. The first partial recording area 36a also projects radially out of the second partial recording area 38a with at least two edges in an overlapping area. Furthermore, the second partial recording area 38a has a taper 100a. The second partial recording area 38a tapers radially towards the first partial recording area 36a at the taper 100a from at least one side. The taper 100a is formed by a chamfered shoulder. The taper 100a has an angle of 25° to 65°, preferably 35° to 55°, relative to the longitudinal axis of the brush head 10a.The minimum distance of the taper from the longitudinal axis of the brush head 10a is 0.3 mm to 1.5 mm, preferably 0.5 mm to 1 mm. The taper has an axial length of 0.2 mm to 2 mm, preferably 0.5 mm to 1.5 mm. The cross-section of the second partial receiving area 38a decreases in the axial direction towards the brush head 16a. The first partial receiving area 36a and the second partial receiving area 38a are both mirror-symmetrical. The second partial receiving area 38a has a diameter of 2 mm to 6 mm, preferably 3.5 mm to 5 mm, on a side facing away from the brush head 16a. Furthermore, the second partial receiving area 38a has a length of 2 mm to 6 mm, preferably 2.5 mm to 4.5 mm. The second partial recording area 38a is slightly angled relative to a longitudinal axis of the brush head 10a. The second partial recording area 38a, or rather its side walls, has an angle of 0 with respect to the longitudinal axis.5° to 5° preferably from 1° to 3°. Furthermore, the second partial receiving area forms a chamfer on a side facing the brush head 16a towards the first partial receiving area 36a. The second partial receiving area 38a serves to receive the axis 110a or to guide the axis 110a into the correct position in the interface receptacle 20a. For this purpose, the axis 110a is rounded on one side at this point, towards the rear, and has a flattened front side.

[0050] Furthermore, the interface receptacle 20a has a third frustoconical partial receptacle 40a. The third partial receptacle 40a is directly adjacent axially to the second partial receptacle 38a. The third partial receptacle 40a does not overlap with the first partial receptacle 36a and the second partial receptacle 38a. Furthermore, the third partial receptacle 40a is arranged at least approximately coaxially with the second partial receptacle 38a. Preferably, the third partial receptacle 40a adjoins the first partial receptacle 36a and the second partial receptacle 38a on one side facing the opening of the interface receptacle 20a.Preferably, the interface receptacle 20a forms a union of the first partial receptacle area 36a, the second partial receptacle area 38a, and the third partial receptacle area 38a. A maximum cross-section of the third partial receptacle area 40a perpendicular to the main extension direction 98a of the brush head 10a is larger than a corresponding maximum cross-section of the second partial receptacle area 38a. At an end facing away from the second partial receptacle area 26a, the third partial receptacle area 40a has a diameter of 5 mm to 13 mm, preferably 7 mm to 11 mm. At an end facing the second partial receptacle area 26a, the third partial receptacle area 40a has a diameter of 4 mm to 12 mm, preferably 6 mm to 10 mm. Furthermore, the third partial receptacle area 40a has an axial length of 3 mm to 11 mm, preferably 5 mm to 9 mm. The third partial recording area 40a is essentially rotationally symmetric.

[0051] Furthermore, the interface receptacle 20a has a fourth partial receptacle area 96a. The fourth partial receptacle area 96a has a frustoconical shape, with one lateral surface of the partial receptacle area 96a being concavely curved. The fourth partial receptacle area 96a is axially directly adjacent to the third partial receptacle area 40a. Furthermore, the fourth partial receptacle area 96a is arranged approximately coaxially with the third partial receptacle area 40a. The fourth partial receptacle area 96a adjoins the third partial receptacle area 40a on one side facing the opening of the interface receptacle 20a. The fourth partial receptacle area 96a forms the opening of the interface receptacle 20a. The fourth partial receptacle area 96a serves to receive a shaft of the interface 24a of the toothbrush handle 12a.The fourth partial receiving area 96a forms the point at which an axis 110a of the toothbrush handle 12a is inserted into the brush heads 10a. The fourth partial receiving area 96a serves as an insertion aid and begins with a small step opposite the base. The fourth partial receiving area 96a has a diameter of 7 mm to 15 mm, preferably 9 mm to 13 mm, at a free end. At a transition to the third partial receiving area 40a, the fourth partial receiving area 96a has a diameter of 5 mm to 13 mm, preferably 7 mm to 11 mm. Furthermore, the fourth partial receiving area 96a has an axial length of 1 mm to 5 mm, preferably 1.5 mm to 3.5 mm. The fourth partial receiving area 96a is essentially rotationally symmetrical. The third partial recording area 40a and the fourth partial recording area 96a serve to record a cam of the toothbrush handle 12a.If there is no cam, the axis 110a is guided through the "space" through which it can be guided, since the axis 110a is usually less voluminous than a cam.

[0052] The interface receptacle 20a is formed by a universal interface receptacle. The interface receptacle 20a is suitable for receiving at least two different interfaces 24a of different toothbrush handles 12a. The interface receptacle 20a therefore fits interfaces 24a of different shapes and / or dimensions. The supporting base body 26a, which partially adjoins the interface receptacle 20a, has a clamping unit 28a for this purpose. The clamping unit 28a is designed to be elastically deflected to receive an interface 24a of a toothbrush handle 12a. The clamping unit 28a is designed to clamp the axis 110a. The clamping unit 28a is directly adjacent to the interface receptacle 20a. The clamping unit 28a is arranged axially in a region of the first partial receptacle area 36a. The clamping unit 28a is arranged axially completely within a region of the first partial receptacle area 36a.Furthermore, the clamping unit 28a is partially axially arranged in a region of the second partial receiving area 38a.

[0053] The clamping unit 28a has at least a partially freestanding clamping wall 30a, 30a', which is directly adjacent to the interface receptacle 20a. The clamping unit 28a has two partially freestanding clamping walls 30a, 30a', which are directly adjacent to the interface receptacle 20a on opposite sides. The clamping walls 30a, 30a' each adjoin one side of the interface receptacle 20a. The first partial receptacle area 36a of the interface receptacle 20a is bounded on two opposite sides by the clamping walls 30a, 30a'. The clamping walls 30a, 30a' are partially freestanding relative to a remaining portion of the base body 26a. The clamping walls 30a, 30a' are partially freestanding relative to a remaining portion of the base body 26a via slots and openings to the interface receptacle 20a, which each extend parallel to the longitudinal axis.The slots are arranged behind the clamping walls 30a, 30a', starting from the interface receptacle 20a, while the openings are arranged next to the clamping walls 30a, 30a' and open into the interface receptacle 20a. The slots and openings each have a length of 6.5 mm to 9 mm, preferably 7 mm to 8 mm. The total dimension of the slot together with the width of the clamping wall is 1 mm to 2.5 mm, preferably 1.2 mm to 1.8 mm. The openings each have a height of 0.02 mm to 0.3 mm, preferably 0.05 mm to 0.15 mm, and a width of 0.1 mm to 0.5 mm, preferably 0.15 mm to 0.3 mm. The clamping walls 30a, 30a' are designed to be deflected radially outwards when the brush head 10a is attached to a toothbrush handle 12a. The clamping walls 30a, 30a' of the clamping unit 28a extend axially in the insertion direction 102a of the interface 24a across the tapered section 42a of the first partial receiving area 36a.The clamping walls 30a, 30a' of the clamping unit 28a are arranged axially in the insertion direction 102a behind the tapered section 100a of the second partial receiving area 38a. The overmolding 32a surrounds the clamping walls 30a, 30a' directly in at least one plane 34a, at least to a substantial extent. The overmolding 32a surrounds the clamping walls 30a, 30a' radially on one side facing away from the interface receptacle 20a. The clamping walls 30a, 30a' are bounded on two sides by the overmolding 32a. Viewed radially from the interface receptacle 20a, the overmolding 32a is located behind the clamping walls 30a, 30a'. The base body 26a has a two-stage recess behind the clamping walls 30a, 30a' on one side where the interface receptacle 20a is applied, which becomes narrower towards the inside and wider towards the outside.In the area of ​​the openings in the base body 26a, which are molded by means of the overmolding 32a, the overmolding 32a directly abuts the interface receptacle 20a. The overmolding 32a serves to cushion an elastic deflection of the clamping walls 30a, 30a'. The clamping walls 30a, 30a' have an axial distance of 3 mm to 6 mm, preferably 4 mm to 5 mm, from the base surface. Furthermore, the clamping walls 30a, 30a' each have a wall thickness of 0.3 mm to 1.2 mm, preferably 0.5 mm to 0.9 mm. The clamping walls 30a, 30a' are designed such that, in the inserted state of the axis 110a, they lie flat against the axis 110a. The axis 110a is laterally flat in the area of ​​the clamping walls 30a, 30a'. The contact surfaces of the clamping walls 30a, 30a' are also smooth.

[0054] The clamping force applied by the clamping walls 30a, 30a' is fundamentally dependent on the axis design, specifically the geometry and dimensions of axis 110a. Clamping is achieved not through point contact but through surface contact of the parts. Parallel to the lateral clamping, a certain degree of clamping capability is automatically created on the rear side of the element, between the two openings. The desired clamping force of the clamping walls 30a, 30a' is from 1 kg to 4 kg, preferably from 1.2 kg to 2.5 kg.

[0055] In principle, it would also be conceivable that the spaces around the internal geometry are not filled with overmolding 32a. This could, in particular, represent a single-component solution, for example, that the brush attachment 10a consists only of a hard component and that technical geometries, such as the clamping walls 30a, 30a', are not overmolded and thus remain exposed. This could result in a cost-effective brush attachment 10a. Furthermore, an additional venting option could be provided when inserting the axis 110a.

[0056] Furthermore, the clamping unit 28a has a partially freestanding clamping rib 104a. The clamping rib 104a is arranged axially at the level of the clamping walls 30a, 30a'. The clamping rib 104a delimits the first partial receiving area 36a of the interface receptacle 20a on a third side. The clamping rib 104a of the clamping unit 28a extends axially in the insertion direction 102a of the interface 24a over the tapered section 42a of the first partial receiving area 36a. The overmolding 32a surrounds the clamping rib 104a directly in at least one plane 34a, at least to a substantial extent. The overmolding 32a surrounds the clamping rib 104a radially on a side facing away from the interface receptacle 20a.

[0057] The overmolding 32a has several functions. It allows for high flexibility in clamping and return. Furthermore, it generally improves the grip of the brush head 10a. In addition, the overmolding 32a, when assembled, provides sealing functions, for example, for the interface receptacle 20a, against the environment. The overmolding 32a also dampens the brush head 16a. The possibility of molding a tongue cleaner from the overmolding has already been demonstrated.

[0058] Furthermore, the clamping unit 28a has a clamping projection 106a that projects at least partially into the interface receptacle 20a. The clamping projection 106a is formed by a projection on an inner wall of the base body 26a that defines the interface receptacle 20a. The clamping projection 106a is arranged axially completely within a region of the first partial receptacle area 36a. The clamping projection 106a is arranged axially in the insertion direction 102a of the interface 24a behind the tapered section 42a of the first partial receptacle area 36a. The clamping projection 106a is axially at least 1 mm, preferably at least 1.5 mm, and preferably a maximum of 3 mm, particularly preferably a maximum of 2.5 mm, away from the tapered section 42a. The clamping projection 106a extends axially to one end of the first partial receptacle area 36a. For reasons of demoldability, the clamping elevation 106a extends axially to one end of the first partial receiving area 36a.The clamping projection 106a has an axial length of 4 mm to 8 mm, preferably 5 mm to 7 mm. Furthermore, the clamping projection 106a has a width of 0.7 mm to 1.8 mm, preferably 1 mm to 1.5 mm, and a height of 0.04 mm to 0.5 mm, preferably 0.06 mm to 0.3 mm. The clamping projection 106a is also located 0.7 mm to 1.5 mm, preferably 1 mm to 1.3 mm, away from the central axis. The clamping projection 106a is arranged on one side of the clamping web 104a of the clamping unit 28a. The clamping projection 106a is arranged on a rear side of the first partial receiving area 38a. The clamping projection 106a extends partially axially across the clamping web 104a. By adjusting the height of the clamping projection 106a, the pull-off force of the brush head can be set. The clamping projection 106a therefore serves to adjust the holding force and to clamp the axis 110a in the interface receptacle 20a.A contact surface of the axis 110a to the clamping projection 106a preferably has a ribbing and / or roughening.

[0059] A depicted perforated area 109a of the brush head 16a in the base body 26a is, as shown, designed for the use of conventional filaments. The perforated area 109a has three regions. The perforated area 109a has a front region, which is directed towards the free end. The front region has two transverse rows. The first row has two holes, while the second row has three holes. The perforated area 109a has an increasing number of holes towards a central region of the perforated area 109a. The central region of the perforated area 109a is located in the center of the perforated area 109a and has five transverse rows. Each transverse row has four holes. Furthermore, the perforated area 109a has a rear region, which is directed towards the brush neck. The rear region has three transverse rows. The first transverse row, adjacent to the central region, has three holes. This is followed by another row with three holes.At the free end, there is another transverse row with two holes. The number of holes decreases towards the neck section 22a. To create the different areas, the holes are arranged in transverse rows, allowing for displacement and thus cutting / profiling of the bristles.

[0060] Figure 23Figure 1 shows the brush head 16a with a conventional bristle field 43a and a conventional arrangement of bristle bundles 44.1a. Various configurations of the bristle field 43a within the perforated field 109a are conceivable. For example, bundles of bristles with a pointed and a rounded cylindrical end can be provided, with the bristle field 43a comprising identical bristle bundles 44.1a and / or asymmetrically punched bristle bundles 44a. Furthermore, a central comb can be formed within the bristle field 43a, which in particular consists of cylindrical filaments. A cut is designed such that the front and rear ends are raised, and a raised section and / or a comb is also formed in the center of the bristle field 43a. The central comb can be formed by means of flat bristle bundles 44.1a.1a can be realized, wherein profiling is achieved by means of several small steps, as well as by means of bristle bundles cut at an angle 44.1a, as in . Fig. 23 shown. Alternatively, it would also be conceivable that the comb is designed as a raised transverse row of bundles, with a front and rear end of the transverse row of bundles cut obliquely. Various filaments that would appear suitable to a person skilled in the art are conceivable as filaments for the bristle bundles 44.1a, such as 2K filaments, Stain Devil (from Perlon®), charcoal, or spiral / twister filaments in a bristle field of a sonic brush.

[0061] Furthermore, other bristle-setting methods that would appear sensible to a specialist are also conceivable. For example, it would be conceivable that the brush head 16a could have recesses for AFT plates or for the PTt process. In particular, it would be conceivable that the bristle-setting method could be specifically designed for pivoting and sonic movements. This could be achieved, for example, using the PTt process, as this requires a minimal head thickness and therefore less material. Furthermore, a small distance between the bristles and the edge can be achieved.

[0062] Furthermore, other alternative configurations and arrangements of the bristle bundles 44.1a.1 of the bristle field 43a are also conceivable. In the Figures 24 to 39Various alternative configurations and arrangements of bristle bundles 44.2a; 44.3a; 44.4a; 44.5a; 44.6a; 44.7a; 44.8a; 44.9a; 44.10a; 44.11a; 44.12a; 44.13a; 44.14a; 44.15a; 44.16a; 44.17a of the bristle field 43a for the brush head 16a are shown as examples. The brush head 16a has a bristle field 43a with at least two substantially different bristle bundles 44.2a; 44.3a; 44.4a; 44.5a; 44.6a; 44.7a; 44.8a; 44.9a; 44.10a; 44.11a; 44.12a; 44.13a; 44.14a; 44.15a; 44.16a; 44.17a. The bristle bundles 44.2a; 44.3a; 44.4a; 44.5a; 44.6a; 44.7a; 44.8a; 44.9a; 44.10a; 44.11a; 44.12a; 44.13a; 44.14a; 44.15a; 44.16a; 44.17a differ in shape and / or orientation.

[0063] Figure 24Figure 1 shows the brush head 16a of the attachment brush 10a with an alternative second arrangement of the bristle bundles 44a.2 of the bristle field 43a. The bristle bundles 44.2a are each formed by combs. The bristle bundles 44.2a are each formed by combs that are bent in a longitudinal profile and have different lengths. The bending is particularly individual and can, in principle, also vary within a bristle field 43a and / or within the bristle bundle 44.2a. One of the bristle bundles 44.2a has a ring shape. A portion of the bristle bundles 44.2a is bent around the ring-shaped bristle bundle 44.2a, while a portion of the bristle bundles 44.2a is bent away from the ring-shaped bristle bundle 44.2a.

[0064] Figure 25Figure 1 shows the brush head 16a of the attachment brush 10a with an alternative third arrangement of the bristle bundles 44.3a of the bristle field 43a. The bristle bundles 44.3a are each formed by combs. The bristle bundles 44.3a are each formed by combs that are bent in a longitudinal profile. One of the bristle bundles 44.3a has a ring shape. A remainder of the bristle bundles 44.3a is bent around the ring-shaped bristle bundle 44.3a.

[0065] Figure 26 Figure 1 shows the brush head 16a of the attachment brush 10a with an alternative fourth arrangement of the bristle bundles 44.4a of the bristle field 43a. The bristle bundles 44.4a are each partially formed by combs. Furthermore, two of the bristle bundles 44.4a are formed by conventional circular bundles. Some of the bristle bundles 44.4a are bent around the circular bristle bundles 44.4a, while some of the bristle bundles 44.4a are bent away from the circular bristle bundles 44.4a.

[0066] Figure 27Figure 1 shows the brush head 16a of the attachment brush 10a with an alternative fifth arrangement of the bristle bundles 44.5a of the bristle field 43a. The bristle bundles 44.5a are each partially formed by combs. Furthermore, two of the bristle bundles 44.5a are formed by conventional circular bundles. The comb-like bristle bundles 44.5a are bent around the circular bristle bundles 44.5a.

[0067] Figure 28 Figure 1 shows the brush head 16a of the brush head 10a with an alternative sixth arrangement of the bristle bundles 44.6a of the bristle field 43a. The bristle bundles 44.6a each have a partial arrow shape, with the tips pointing outwards. This allows for an advantageous cleaning effect, particularly when used on a sonic toothbrush or a toothbrush with a back-and-forth motion. Furthermore, several of the bristle bundles 44.6a are formed from conventional circular bundles.

[0068] Figure 29 Figure 1 shows the brush head 16a of the brush head 10a with an alternative seventh arrangement of the bristle bundles 44.7a of the bristle field 43a. The bristle bundles 44.7a are formed from conventional circular bundles, the size of which varies and the distribution of which is at least partially random. In particular, the distribution is free of an axis of symmetry parallel to the principal directions of the toothbrush. Also integrated are two nested bristle bundles 44.7a, one of which is designed as an annular bundle and the other as a conventional circular bundle lying within the annular bundle.

[0069] Figure 30Figure 1 shows the brush head 16a of the attachment brush 10a with an alternative eighth arrangement of the bristle bundles 44.8a of the bristle field 43a. Some of the bristle bundles 44.8a are formed from conventional circular bundles, with the size of the bristle bundles 44.8a varying. Another part of the bristle bundles 44.8a has a freeform shape.

[0070] The Figures 31a and 31bFigure 1 shows the brush head 16a of the attachment brush 10a with an alternative ninth arrangement of the bristle bundles 44.9a of the bristle field 43a. The bristle bundles 44.9a are each formed by combs. The bristle bundles 44.9a are each formed by combs that are wavy in a longitudinal and / or an end profile. The number of wave troughs and crests is variable. Different waves are possible within the same bristle field 43a. The combs each exhibit partially different inclinations, with the angle of inclination relative to a normal of the brush head 16a increasing for the bristle bundles 44.9a towards the front and rear ends of the bristle field 43a, and the bristle bundles 44.9a of the middle combs being more perpendicular.

[0071] The Figures 32a and 32bFigure 1 shows the brush head 16a of the attachment brush 10a with an alternative tenth arrangement of the bristle bundles 44a.10 of the bristle field 43a. The bristle bundles 44.10a have an elongated basic shape and each exhibits partially different inclinations. The transversely arranged combs with inclinations form an X-shape when viewed from the side and the bristle field is viewed longitudinally.

[0072] The Figures 33a and 33b Figure 1 shows the brush head 16a of the attachment brush 10a with an alternative eleventh arrangement of the bristle bundles 44.11a of the bristle field 43a. The bristle bundles 44.11a are each partially formed by combs that are bent in a longitudinal profile. Furthermore, the bristle bundles 44.11a each exhibit partially different inclinations, again forming an X-shape.

[0073] The Figures 34a and 34bFigure 1 shows the brush head 16a of the brush head 10a with an alternative twelfth arrangement of the bristle bundles 44.12a of the bristle field 43a. The bristle bundles 44.12a are each partially formed by combs that are bent in a longitudinal profile. Furthermore, the bristle bundles 44.12a each exhibit partially different oblique angles. The main extent of most of the combs is parallel to the longitudinal axis of the toothbrush, with the curvature of the individual combs being symmetrical to the longitudinal axis of the toothbrush.

[0074] The Figures 35a and 35bFigure 1 shows the brush head 16a of the brush head 10a with an alternative thirteenth arrangement of the bristle bundles 44.13a of the bristle field 43a. The bristle bundles 44.13a are each partially formed by combs that are bent in a longitudinal profile. Furthermore, the bristle bundles 44.13a each exhibit partially different oblique angles. The main extent of the combs is parallel to the longitudinal axis of the toothbrush, with the bending of the individual combs being symmetrical to the longitudinal axis of the toothbrush.

[0075] Figure 36 Figure 1 shows the brush head 16a of the attachment brush 10a with an alternative fourteenth arrangement of the bristle bundles 44.14a.14 of the bristle field 43a. Part of the bristle bundles 44.14a are formed by conventional circular bundles. Furthermore, part of the bristle bundles 44.13a are each formed by combs that are bent in a longitudinal profile and each has partially different inclinations.

[0076] Figure 37 Figure 1 shows the brush head 16a of the attachment brush 10a with an alternative fifteenth arrangement of the bristle bundles 44.15a of the bristle field 43a. Two of the bristle bundles 44.15a are elliptically shaped. Furthermore, several bristle bundles 44.15a are arranged around the elliptical bristle bundles 44.15a, which have different, partly opposing, inclinations.

[0077] Figure 38 Figure 1 shows the brush head 16a of the attachment brush 10a with an alternative sixteenth arrangement of the bristle bundles 44.16a of the bristle field 43a. Some of the bristle bundles 44.16a have a freeform shape and each form the shape of a turbine blade. Furthermore, at least two of the bristle bundles 44.16a are formed by conventional circular bundles. The freeform bristle bundles 44.16a are arranged around the circular bristle bundles 44.16a.

[0078] Figure 39Figure 1 shows the brush head 16a of the attachment brush 10a with an alternative seventeenth arrangement of the bristle bundles 44.17a of the bristle field 43a. One of the bristle bundles 44.17a is elliptically shaped. The remaining bristle bundles 44.17a are free-form and each form the shape of a turbine blade. The free-form bristle bundles 44.17a are arranged around the elliptical bristle bundle 44.17a.

[0079] The bristle fields 43a each exhibit a certain degree of symmetry, in particular point and / or mirror symmetry. However, arrangements free of symmetry would also be conceivable. Furthermore, other arrangements and shapes of the bristle bundles are also conceivable, such as multilevel tufts, in which the bristle bundles have different heights within the bundle.

[0080] Figure 16Figure 1 shows an electric toothbrush handle 12a. The toothbrush handle 12a has an interface 24a for coupling with the brush head 10a. The interface 24a has an axis 110a for direct engagement with the interface receptacle 20a of the brush head 10a. The axis 110a is formed by a metal shaft. However, in principle, another design of the axis 110a that would appear sensible to a person skilled in the art would also be conceivable. Furthermore, the toothbrush handle 12a has a housing 46a. The housing 46a has a base body 112a made of a hard component. The base body 112a forms a supporting structure of the housing 46a. The base body 112a is manufactured in one piece. However, in principle, another design that would appear sensible to a person skilled in the art would also be conceivable, such as a two-part design. Furthermore, the housing 46a has an overmolding 114a made of a soft material.The overmolding 114a is partially arranged on an outer surface of the base body 112a. The overmolding 114a forms a grip area of ​​the housing 46a. Furthermore, the electric toothbrush handle 12a has a cover 113a. The cover 113a is designed to close the housing 112a on a side facing away from the interface 24a ( ). Figures 16, 17, 18 , 19 and 20 ).

[0081] The following will refer to the Figures 40 to 44 Reference is made to the figures, which show different views of the toothbrush handle 12a, with the housing 46a and the lid 113a hidden in each case. Due to the different views, some elements are not shown in all figures and are therefore not labeled with reference symbols in all figures.

[0082] Furthermore, the toothbrush handle 12a has a fixed frame unit 52a arranged in the housing 46a. The frame unit 52a is inserted into the housing 46a in an assembled state. The frame unit 52a is formed in one piece. The frame unit 52a extends axially over a large part of the housing 46a. The frame unit 52a is formed by a plastic frame. The frame unit 52a is made of plastic, preferably polypropylene. However, in principle, other designs of the frame unit 52a that would appear sensible to a person skilled in the art would also be conceivable. The frame unit 52a also has various geometries arranged in series for receiving different components of the internal workings of the toothbrush handle 12a. Furthermore, the frame unit 52a has openings and slots for cables and for weight reduction.

[0083] Furthermore, the toothbrush handle 12a has a drive unit 48a, which is housed in the casing 46a, for driving the interface 24a. The drive unit 48a is designed to drive the axis 110a of the interface 24a. The drive unit 48a is a motor. The drive unit 48a is a oscillating armature motor. The frame unit 52a at least partially houses the drive unit 48a. The frame unit 52a fully houses the drive unit 48a. The drive unit 48a is mounted directly in the frame unit 52a. In particular, there is no separate motor assembly. The drive unit 48a has a rotor 58a. The rotor 58a is designed to perform an oscillating movement. The rotor 58a has a one-piece cage element 60a. The cage element 60a is designed to accommodate at least one magnet 62a, 62a'.The cage element 60a is designed to receive two magnets 62a, 62a'. The magnets 62a, 62a' are each formed by permanent magnets. The cage element 60a has a receiving area for each of the magnets 62a, 62a'. Furthermore, the cage element 60a has a base body 64a comprising at least one receiving area and axial extensions 66a, 68a arranged on both sides of the base body 64a, which form an axis of rotation for the rotor 58a. The axial extensions 66a, 68a are arranged on opposite sides of the base body 64a. A first axial extension 66a is arranged on a side of the base body 64a facing away from the interface 24a. A second axial extension 68a is arranged on a side of the base body 64a facing the interface 24a. The second axial extension 68a is directly coupled to the interface.The second axial extension 68a is designed to provide a rotationally fixed mounting for the axis 110a of the interface 24a. The mounting of the axis 110a can be achieved, for example, by press fit, bonding, or welding. Furthermore, the rotor 58a has at least one cover 70a, 70a', which is designed to close the receiving areas of the cage element 60a. The rotor 58a has at least two covers 70a, 70a', each designed to close one side of the receiving areas of the cage element 60a and, in particular, also to direct the magnetic field. The receiving areas are open on two opposite sides and are closed by means of the covers 70a, 70a' after the magnets 62a, 26a' have been inserted. The covers 70a, 70a' are each screwed, glued or bolted to the base body 64a of the cage element 60a.During assembly, the first cover 70a is preferably connected to the base body 64a first, then the magnets 62a, 62a' are inserted, and subsequently the second cover 70a' is connected to the base body 64a. Bearings 118a, 120a are then mounted to support the rotor 58a. The rotor 58a is held in a receiving area of ​​the frame unit 52a by its bearings 118a, 120a. The receiving area for the rotor 58a is open on two opposite sides. The covers 70a, 70a'' are designed to cover the magnets 62a, 62a'' and to distribute the magnetic field of the magnets 62a, 62a''.

[0084] Furthermore, the drive unit 48a has a return spring 72a. The return spring 72a is formed by a helical spring. However, another design of the return spring, which would appear sensible to a person skilled in the art, would also be conceivable, such as a spiral spring or leaf spring. The return spring 72a is rotationally fixed at one end to the first axial extension 66a of the rotor 58a. For this purpose, the return spring 72a engages at one end in a groove of the first axial extension 66a of the cage element 60a, which extends radially through an axis of rotation of the rotor 58a. The first end of the return spring 72a is further secured to the first axial extension 66a by means of a nut 115a screwed onto the first axial extension 66a and a clamping ring 117a interacting with it. The clamping ring 117a serves to optimally distribute the force for fixing by the nut 115a onto the return spring 72a.Furthermore, the return spring 72a is variably fixed to the frame unit 52a at one end via a fixing element 74a, thus preventing rotation. The return spring 72a is variably fixed to the frame unit 52a in a rotational position relative to the frame unit 52a. The return spring 72a can be fixed to the frame unit 52a in various rotational positions relative to the frame unit 52a by means of the fixing element 74a. The fixing element 74a allows for the adjustment of the return spring 72a's rotational position relative to the frame unit 52a, thereby compensating for manufacturing tolerances. This also indirectly allows for the adjustment of the rotor 58a's initial position relative to the frame unit 52a. The fixing element 74a is fixed against the frame unit 52a by means of a screw 116a, which extends through the frame unit 52a into the fixing element 74a, and which receives the second end of the return spring 72a.The second end of the return spring 72a is received in a recess of the fixing element 74a. The screw 116a is guided through an elongated hole in the frame unit 52a, allowing the fixing element 74a to be fixed to the frame unit 52a in various positions relative to the frame unit 52a. This holds the second end of the return spring 72a in its current position. In particular, the second end of the return spring 72a can be fixed in various positions relative to the frame unit 52a. During assembly, the fixing element 74a can be pre-assembled with the return spring 52a without tightening the screw 116a. The axle 110a or the rotor 58a can then be aligned, and subsequently the screw 116a tightened. The return spring 72a is designed to allow a rotation of 2° to 10°, preferably 3° to 7°.

[0085] Alternatively, screw 116a can be inserted through a simple blind hole instead of a slotted hole. This eliminates the adjustability, making alignment impossible. However, the return spring 72a can still be positioned and fixed.

[0086] Furthermore, the drive unit 48a has a stator 76a. The stator 76a comprises a one-piece carrier 78a, a laminated core 80a inserted into the carrier 78a, and a coil 82a surrounding the laminated core 80a. The stator 76a includes the one-piece carrier 78a made of a hard component, the laminated core 80a inserted into the carrier 78a, the coil 82a surrounding the laminated core 80a, and a guide vane cover arranged between the coil 82a and the laminated core 80a. The stator 76a is designed as a module. The carrier 78a is formed from a plastic substrate. The carrier 78a is formed from a substantially cuboid substrate which has a cuboid recess on one side for receiving the laminated core 80a. The sheet metal stack 80a has a U-shaped cross-section, with the free ends of the sheet metal stack 80a pointing away from the support.The laminated core 80a consists of a multitude of closely packed guide vanes. These guide vanes are bonded, pressed, snapped, or otherwise connected to the supports 78a. Furthermore, the support 78a has a guide groove on the reverse side of the recesses for receiving the coil 82a. The coil 82a surrounds the support 78a and the laminated core 80a. The coil 82a is wound around the laminated core 80a and the support 78a. The coil 82a is oriented longitudinally. The coil 82a and the laminated core 80a are designed without contact. To insulate the coil 82a from the laminated core 80a on a side facing away from the support 78a, the stator 76a has a concealed insulating plate located between the coil 82a and the laminated core 80a. The insulating plate is formed by a guide vane cover. The insulating plate is made of plastic.The guide plate cover is mounted by snapping, gluing, or similar means. The insulating plate protects the wire of the coil 82a from the edges of the laminated core 80a and prevents a short circuit between the coil 82a and the laminated core 80a. The support 78a of the drive unit 48a is directly connected to the frame unit 52a. The support 78a is screwed to the frame unit 52a. In principle, however, another connection that would seem sensible to a specialist would also be conceivable. The support 78a covers the rotor 58a of the drive unit 48a from one side. The support 78a conceals one open side of the receiving area of ​​the frame unit 52a for the rotor 58a. Furthermore, the laminated core 80a partially protrudes into the receiving area of ​​the rotor 58a. In a mounted state, the laminated core 80a at least partially surrounds the rotor 58a.

[0087] Furthermore, the electric toothbrush handle 12a has a rotor cover 88a. The rotor cover 88a covers the rotor 58a of the drive unit 48a from a side opposite the carrier 78a. The rotor cover 88a conceals a second open side of the receiving area of ​​the frame unit 52a for the rotor 58a. In an assembled state, the rotor 58a is directly surrounded by the stator 76a, the frame unit 52a, and the rotor cover 88a. The rotor cover 88a is formed from a plastic part. The rotor cover 88a is firmly connected to the frame unit 52a. The rotor cover 88a is connected to the frame unit 52a opposite the carrier 78a. The rotor cover 88a is screwed to the frame unit 52a. In principle, however, another type of connection that would appear sensible to a person skilled in the art would also be conceivable. The rotor cover 88a, together with the frame unit 52a, is intended for the storage and fixing of the rotor 58a of the drive unit 48a.The rotor cover 88a and the frame unit 52a each form two semicircular axle mounts for a single mount of the rotor 58a. Each semicircular axle mount is formed by corresponding axle mounts, which together form a complete axle mount.

[0088] The axle mounts are each designed to receive the two axle extensions 66a, 68a of the rotor 58a via bearings 118a, 120a, respectively. The bearings 118a, 120a are housed in the axle mounts and, in turn, support the axle extensions 66a, 68a of the rotor 58a relative to the frame unit 52a. Various configurations of the bearings 118a, 120a are conceivable that would appear practical to a person skilled in the art. The rotor 58a is supported between the frame unit 52a and the rotor cover 88a. The rotor cover 88a, together with the frame unit 52a, also provides support and sealing for the axle 110a of the interface 24a. The rotor cover 88a and the frame unit 52a each form a semicircular axle receptacle for a sealing ring 122a and a bearing 124a for the axle 110a. The axle 110a is mounted between the rotor cover 88a and the frame unit 52a.Several configurations of the bearing 124a are conceivable that would appear sensible to a specialist. For example, it would be conceivable that the bearing 124a is formed by a plain bearing made of plastic or the material Iglidur. The rotor cover 88a therefore extends axially from the drive unit 48a to an axis exit of the interface 24a from the housing 46a.

[0089] Furthermore, the electric toothbrush handle 12a has a cover cap 126a. The cover cap 126a is designed to be slid over an axial end of the rotor cover 88a and the frame unit 52a. In its assembled state, the cover cap 126a encompasses the axial end of both the rotor cover 88a and the frame unit 52a. The cover cap 126a serves to further connect and center the rotor cover 88a and the frame unit 52a relative to each other. The cover cap 126a also guides the axis 110a of the interface 24a. The axis 110a passes through the cover cap 126a. Finally, the cover cap 126a seals the interior of the housing against the interface 24a. The cover cap 126a serves to seal between the housing 46a and the frame unit 52a. The cover cap 126a includes a sealing ring 128a for this purpose.

[0090] Furthermore, the electric toothbrush handle has at least one stop element 84.1a, 84.2a. In the illustrated embodiment, two stop elements 84.1a, 84.2a are disclosed by way of example, although in principle only one of the two stop elements 84.1a, 84.2a could also be provided. The stop elements 84.1a, 84.2a are designed to limit rotation of the rotor 58a of the drive unit 48a from a starting position. The stop elements 84.1a, 84.2a each form an end stop of the rotor 58a during an oscillating drive movement. The stop elements 84.1a, 84.2a serve in particular to prevent overextension of the return spring 72a. A first stop element 84.1a is formed by a pin 86a that is fixedly connected to the rotor 58a of the drive unit 48a. The pin 86a is inserted radially into an opening 130a of the rotor 58a.The pin 86a is inserted radially into an opening 130a of the second axial extension 68a. The pin 86a is fixedly arranged on the rotor 58a and projects partially radially from the rotor 58a. Furthermore, the pin 58a is elastically mounted at one end to the frame unit 52a. The pin 58a is elastically mounted at a free end to the frame unit 52a. The end of the pin 58a facing the rotor 58a is supported in an opening 131a of the frame unit 52a via an elastic sleeve 132a. The sleeve 132a is, for example, formed by a silicone sleeve. In principle, however, another embodiment that would appear sensible to a person skilled in the art would also be conceivable. The stop positions or a maximum angle are defined by the size of the opening 131a in the frame unit 52a.

[0091] A second stop element 84.2a is integrally formed with the rotor cover 88a. This second stop element 84.2a forms an integral extension with the rotor cover 88a, which faces the rotor 58a. The shape of the second stop element 84.2a is adapted to the end positions of the rotor 58a. The second stop element 84.2a serves as a stop for the base body 64a of the cage element 60a and / or for the covers 70a, 70a' of the rotor 58a. The second stop element 84.2a is formed by a recess in the rotor cover 88a. However, it would also be conceivable for the second stop element 84.2a to be formed by a separate component attached to the rotor cover 88a.

[0092] The stop elements 84.1a, 84.2a and the corresponding limiting counter elements, in particular the openings 130a ,131 a and the cover 70a', are selected / shaped such that movement from a zero position per side is only possible within a range of 3° to 12°, preferably 4° to 8°.

[0093] Furthermore, the toothbrush handle 12a has an energy storage device 50.1a; 50.2a housed in the casing 46a for supplying energy to the drive unit 48a. The frame unit 52a accommodates the energy storage device 50.1a; 50.2a. The energy storage device 50.1a; 50.2a is located on the side of the drive unit 48a facing away from the interface 24a. The energy storage device 50.1a; 50.2a is radially clamped by lateral retaining arms of the frame unit 52a. Furthermore, longitudinal displacement of the energy storage device 50.1a; 50.2a is prevented by the chamber-like structure of the frame unit 52a. The energy storage device 50.1a; 50.2a is arranged essentially coaxially with the drive unit 48a. The energy storage device 50.1a; 50.2a is formed by a battery, in particular a NiMH battery and / or a Li-ion battery. However, in principle, another design of the energy storage device 50.1a; 50. would also be possible, which would appear sensible to a person skilled in the art.2a is conceivable, for example as a battery. Two different energy storage devices 50.1a and 50.2a are provided as examples, which are used with the toothbrush handle 12a. A first proposed energy storage device 50.1a, as it is in the . Figures 40 , 42 and 43 The first proposed energy storage device 50.1a is formed by a single AA energy storage cell. A second proposed energy storage device 50.2a, as shown in the Figure 44The assembly shown is formed by three energy storage cells connected by a frame 134a of the energy storage unit 50.2a. The frame unit 52a, with slight modifications, is suitable for accommodating both energy storage units 50.1a and 50.2a. The frame unit 52a is designed to accommodate either a single AA energy storage cell or three AAA energy storage cells within the frame 134a. The frame 134a is designed to connect the three energy storage cells in series. This series connection is achieved by metal plates that serve as the contact points for the energy storage cells. The axial extent of the frame 134a corresponds to the axial extent of each individual AA energy storage cell.

[0094] The electric toothbrush handle 12a further comprises a charging coil 54a for charging the energy storage device 50.1a; 50.2a. However, charging the energy storage device 50.1a; 50.2a directly via a plug connection would also be conceivable. The charging coil 54a is formed by an induction coil. The charging coil 54a is housed in the fixed frame unit 52a. The frame unit 52a has a receiving area for the positionally fixed mounting of the charging coil 54a. The charging coil 54a is held and clamped externally by the frame unit 52a. For this purpose, the frame unit 52a has at least two to five, preferably at least three to four, retaining arms 55a, which are integrally formed on a base body of the frame unit 52a and secure the position of the charging coil 54a both radially and axially. Preferably, the frame unit 52a has, by way of example, exactly four retaining arms.In principle, however, a different number of retaining elements, particularly more than five, is also conceivable, provided it appears reasonable to a person skilled in the art. The charging coil 54a is mounted, in particular, along its longitudinal axis. The charging coil 54a is arranged on the side of the energy storage device 50.1a; 50.2a facing away from the drive unit 48a. The charging coil 54a is arranged essentially coaxially with the energy storage device 50.1a; 50.2a and the drive unit 48a. Furthermore, the cover 113a engages with the charging coil 54a in its assembled state to allow a ferrite core of a charger to be placed inside the coil. The charging coil 54a has, in particular, an inner diameter of 6 mm to 14 mm, preferably 8 mm to 15 mm, and an outer diameter of 12 mm to 19 mm, preferably 14 mm to 17 mm. Furthermore, the charging coil 54a has a height of 4 mm to 15 mm, preferably 5 mm to 10 mm.

[0095] Furthermore, the electric toothbrush handle 12a has a circuit board 56a. The circuit board 56a is designed to control the drive unit 48a. In operation, the circuit board 56a is designed to provide a sinusoidal control signal to the drive unit 48a. For this purpose, the circuit board 56a is coupled to the energy storage device 50.1a; 50.2a. The energy storage device 50.1a; 50.2a is connected to the actual drive unit 48a via lines running through the circuit board 56a, on which the control unit is integrated. The energy storage device 50.1a; 50.2a is connected to the coil 82a, which is wound around the laminated core 80a. The coil 82a does not rest directly on the laminated core 80a but rests on the support 78a on one side and on the guide plate cover on the other. An alternating current is generated in the coil 82a, which ensures that an alternating polarization is formed at the free ends of the laminated core 80a.In rotor 58a, the magnets 62a, 62a' are fixedly arranged and mounted by means of the covers 70a, 70a', which optimize the field generated by the magnets 62a, 62a'. Rotor 58a is rotatably mounted within the laminated core 80a. When the free ends of the laminated core 80a are polarized, rotor 58a tends to realign itself with the magnets 62a, 62a' in the field, thus generating movement. If the ends of the laminated core 80a are repolarized, rotor 58a tends to align itself in the opposite direction. This results in an oscillating back-and-forth motion of rotor 58a. The return spring 72a on the axis of rotation ensures that rotor 58a returns to a zero position and also provides smoother transitions in movement when the polarization changes. Overall, the return spring 72a is necessary to make the movements possible at all, since otherwise the forces due to the polarization would be so large that no oscillation would be possible.

[0096] The circuit board 56a controls the energy pulses supplied to the drive unit 48a. These parameters are specifically adapted to the drive in question and the product. To ensure smooth operation of the drive unit 48a, it is driven sinusoidally rather than with pulses and pauses.

[0097] Furthermore, the circuit board 56a is coupled to the charging coil 54a. The circuit board 56a is designed to control the charging process of the energy storage device 50.1a; 50.2a. The circuit board 56a also features an actuating element 136a that can be actuated through the base body 112a of the housing 46a and serves to activate and / or deactivate the toothbrush handle 12a. The actuating element 136a is designed to be actuated through the overmolding 114a of the housing 46a. The circuit board 56a also includes other elements, such as, in particular, conductors, resistors, LEDs, and / or a control unit. The circuit board 56a is also partially positively engaged with the frame unit 52a and extends over a large portion of the axial extent of the frame unit 52a. The circuit board 56a extends at least over the energy storage unit 50.1a; 50.2a and the drive unit 48a of the toothbrush handle 12a.For a positive-locking connection of the printed circuit board 56a, the frame unit 52a has several hook-shaped positive-locking elements 138a, which are designed to partially engage the printed circuit board 56a in a mounted state. For mounting, the printed circuit board 56a has recesses 140a corresponding to the positive-locking elements 138a on an outer edge, allowing the printed circuit board 56a to be moved past the positive-locking elements 138a into a final position. Preferably, when mounting the printed circuit board 56a into a final position, it is placed onto the frame unit 52a in a pre-positioned position, allowing the printed circuit board 56a to be guided past the positive-locking elements 138a by means of the recesses 140a. The printed circuit board 56a is then slid under the positive-locking elements 138a and thereby secured. For this purpose, the printed circuit board 56a has separate, small recesses, not visible, for snapping into the final position.Additionally, the positive locking elements 138a serve as hold-downs, which forcefully secure the circuit board 56a. At one lower end of the circuit board 56a, the frame unit 52a also has a stop with a ramp, which serves for the precise positioning of the circuit board 56a.

[0098] Tolerances between the frame unit 52a and its components and the housing 46a must be compensated for so that, on the one hand, the actuating element 136a is in the correct position for actuation through the housing 46a when assembled, and on the other hand, the charging coil 54a is optimally positioned so that the inductive charging process achieves optimal efficiency. Furthermore, tolerances must be compensated for so that the frame unit 52a sits securely in the housing 46a and no noise is generated during operation. According to the invention, length compensation for these tolerances is achieved by inserting a compressible length compensation element 57a, for example, a compressible plastic, which is positioned between the charging coil 54a and the frame unit 52a. Alternatively, elastic elements could also be integrated into the frame unit 52a to ensure length compensation.For example, flexible elements that are stretched, i.e. bent, when the lid 113a is fitted.

[0099] Overall, the frame unit 52a can be divided into several zones. The frame unit 52a has a coil zone. Viewed from below, the coil zone forms the first zone and serves for the direct mounting and installation of the charging coil 54a. Furthermore, the frame unit 52a has a battery zone. The battery zone connects directly to the coil zone and is designed to accommodate the energy storage device 50.1a; 50.2a. The frame unit 52a also has a spring zone. The spring zone connects directly to the battery zone on a side opposite the coil zone and is designed to accommodate the return spring 72a and the fixing element 74a. Finally, the frame unit 52a has a vibrating armature zone. The vibrating armature zone connects directly to the spring zone on a side opposite the coil zone and is designed to accommodate the drive unit 48a. The frame unit 52a is completely open in the area of ​​the vibrating armature zone.Furthermore, the frame unit 52a has an axis zone. The axis zone connects directly to the oscillating armature zone on a side facing away from the coil zone and is designed to accommodate interface 24a or axis 110a of interface 24a. Additionally, the frame unit 52a has a print zone. The print zone is located on a front side of the frame unit and is designed to accommodate the printed circuit board 56a.

[0100] The frame unit 52a is primarily assembled from the rear. Only the circuit board 56a and the stator 76a are mounted from the front. Furthermore, the charging coil 54a and a connecting cap are mounted along the longitudinal axis. The drive unit 48a and the energy storage unit 50.1a; 50.2a are mounted from the rear of the frame unit 52a.

[0101] According to the invention, when assembling the electric toothbrush handle 12a, the entire internal assembly is first mounted over the frame unit 52a and then, in a second step, inserted into the housing 46a. The frame unit 52a is clamped in the housing 46a. For this purpose, the frame unit 52a has locking lugs that engage in locking recesses in the housing 46a. Subsequently, in a third step, the cover 113a is attached to the housing 46a and secured, thus sealing the internal assembly. The cover 113a can be screwed to the housing 46a or, for example, locked using a bayonet fitting.

[0102] The Figures 19 to 22Figure 1 shows an electric toothbrush 90a with the electric toothbrush handle 12a and the brush head 10a in an attached position. Due to the different viewpoints, some elements are not shown in all figures and are therefore not labeled with reference symbols in all figures. When the brush head 10a is mounted onto the electric toothbrush handle 12a, correct assembly is ensured by the shape of the shaft 110a. During insertion, the user knows approximately which side is the front, particularly from the bristles on the brush head 10a and the design of the toothbrush handle 12a. The internal geometry of the brush head 10a, with its various steps and contours of the interface receptacle 20a and ultimately guided by the two flattened sections of the shaft 110a at the front and rear, ensures precise and correct assembly. A free end of the shaft 110a serves as a stop during assembly.

[0103] To further stabilize the brush head 10a on the toothbrush handle 12a, the cavity of the interface receptacle 20a, in the area where the shaft 110a exits the handle housing, can be filled. This can be achieved, for example, by forming a pin around the shaft 110a, which can be designed as a continuation of the cover cap 126a. Alternatively, the cavity can be filled with a component that fits over the shaft 110a. This component can be attached to the shaft reversibly or irreversibly. Filling the cavity provides the brush head 10a with a stop in the event of a load. This directs the forces of the load during use not only onto the shaft but also onto the housing or frame unit, thus relieving stress on the drive unit. Figures 45 to 59Another embodiment is shown. The following descriptions are essentially limited to the differences between the embodiments, whereby with regard to components, features and functions that remain the same, reference is made to the description of the embodiment of the Figures 1 to 44 Reference can be made to. To distinguish the embodiments, the letter a in the reference numerals of the embodiment is used in the Figures 1 to 44 by the letter b in the reference numerals of the embodiment of the Figures 45 to 59 replaced. With regard to identically designated components, especially those with the same reference numerals, reference can generally also be made to the drawings and / or the description of the embodiment of the Figures 1 to 59 be referred.

[0104] In the Figures 45 to 52An alternative design variant of an interface receptacle 20b or a clamping unit 28b of a brush head 10b is shown. The external shape of the brush head 10b does not change visually when it is tapered. However, a base body 26b of the brush head 10b has a different appearance.

[0105] The clamping unit 28b has at least a partially freestanding clamping wall 30b, 30b', which is directly adjacent to the interface receptacle 20b. The clamping unit 28b has two partially freestanding clamping walls 30b, 30b', which are directly adjacent to the interface receptacle 20b on opposite sides. The clamping walls 30b, 30b' each adjoin one side of the interface receptacle 20b. The first partial receptacle area 36b of the interface receptacle 20b is bounded on two opposite sides by the clamping walls 30b, 30b'. The clamping walls 30b, 30b' are partially freestanding relative to a remaining portion of the base body 26b. The clamping walls 30b, 30b' are partially freestanding relative to a remaining portion of the base body 26b via slots and openings to the interface receptacle 20b, which each extend parallel to the longitudinal axis.The slots are arranged behind the clamping walls 30b, 30b', starting from the interface receptacle 20b, while the openings are arranged next to the clamping walls 30b, 30b' and open into the interface receptacle 20b. In this embodiment, the slot is shaped such that the clamping walls 30b, 30b' are identical in shape to the first embodiment in a first section. The slot then continues tapering towards the head section, i.e., the height of the wall or the depth of the slot decreases to zero. The total length of the slots and openings is 10.5 mm to 14.5 mm, preferably 11 mm to 13 mm. The other dimensions remain as in the first embodiment. The clamping walls 30b, 30b' are designed to be deflected radially outwards when the brush head 10b is attached to a toothbrush handle 12b.The clamping walls 30b, 30b' of the clamping unit 28b extend axially in the insertion direction 102b of an interface 24b across the tapered section 42b of the first partial receiving area 36b. The clamping walls 30b, 30b' of the clamping unit 28b are arranged axially in the insertion direction 102b behind a tapered section 100b of the second partial receiving area 38b. An overmolding 32b surrounds the clamping walls 30b, 30b' directly, at least to a substantial extent, in at least one plane 34b. The overmolding 32b surrounds the clamping walls 30b, 30b' in a radial direction on one side facing away from the interface receiving area 20b. The clamping walls 30b, 30b' are bounded on two sides by the overmolding 32b. The overmolding 32b is, viewed radially from the interface receptacle 20b, behind the clamping walls 30b, 30b'.The base body 26b has a two-stage recess behind the clamping walls 30b, 30b' on one side facing away from the interface receptacle 20b, which becomes narrower towards the inside and wider towards the outside. In an area of ​​the openings in the base body 26b, which are molded by means of the overmolding 32b, the overmolding 32b abuts directly against the interface receptacle 20b. The overmolding 32b serves to cushion an elastic deflection of the clamping walls 30b, 30b'. The contact surfaces of the clamping walls 30b, 30b' are smooth.

[0106] In this second embodiment, the partially freestanding clamping web 104b is also designed as a clamping bridge 142b. The clamping bridge 142b is characterized by its elastic design, similar to the clamping walls 30b, 30b'. This elastic design allows the clamping bridge 142b to contribute to the clamping force and result in an increased pull-off force. If the clamping web 104b is made thinner in the radial direction, it becomes a clamping bridge 142b that is connected to the body of the base body 26b only at the front and rear and is otherwise laterally freestanding with the openings. The clamping bridge 142b is parallel to the clamping walls 30b, 30b'. The material thickness of the clamping bridge 142b is comparable to that of the clamping walls 30b, 30b'.

[0107] The clamping bridge 142b is arranged axially at the level of the clamping walls 30b, 30b'. The clamping bridge 142b delimits the first partial receiving area 36b of the interface receptacle 20b on a third side. The clamping bridge 142b of the clamping unit 28b extends axially in the insertion direction 102b of the interface 24b over the tapered section 42b of the first partial receiving area 36b. The overmolding 32b surrounds the clamping bridge 142b directly in at least one plane 34b, at least to a substantial extent. The overmolding 32b surrounds the clamping bridge 142b radially on one side facing away from the interface receptacle 20b.

[0108] The clamping force applied by the clamping walls 30b, 30b' and the clamping bridge 142b is fundamentally dependent on the axis design, specifically the geometry and dimensions of the axis 110b. Clamping does not occur via point contact, but rather via surface contact of the parts on three or four sides. Three sides are equipped with flexible clamping elements, while the fourth side is rigid. Parallel to the lateral clamping provided by the clamping walls 30b, 30b', a clamping force is thus achieved by means of the clamping bridge 142b. The desired clamping force of the clamping unit 28b is within the range of that of the first embodiment.

[0109] In principle, it would also be conceivable that the spaces around the internal geometry are not filled with overmolding 32b. This could, in particular, represent a single-component solution, for example, that the brush attachment 10b consists only of a hard component and that technical geometries, such as the clamping walls 30b, 30b' and clamping bridge 142b, are not overmolded and thus remain exposed. This could result in a cost-effective brush attachment 10b. Furthermore, an additional venting option could be provided when inserting the axis 110b.

[0110] The following will refer to the Figures 53 to 56 , as well as the Figures 57 to 59Reference is made to the figures, which show different views of the toothbrush handle 12b or sections of the toothbrush handle and its parts, with a housing 46b and a cover 113b respectively hidden. This toothbrush handle 12b is an embodiment of the invention. Due to the different views, some elements are not shown in all figures and are therefore not provided with reference numerals in all figures.

[0111] Furthermore, the toothbrush handle 12b comprises a fixed frame unit 52b arranged in the housing 46b and an additional frame unit 144b for a charging coil 54b. The frame unit 52b, with the frame unit 144b of the charging coil 54b mounted on it, is inserted into the housing 46b in an assembled state. The frame unit 52b is formed in one piece, while the frame unit 144b of the charging coil 54b is mounted to it. The frame unit 52b, with the frame unit 144b of the charging coil 54b mounted on it, extends axially over a large portion of the housing 46b. The frame unit 52b and the frame unit 144b of the charging coil 54b are formed by a plastic frame. The frame unit 52b and the frame unit 144b of the charging coil 54b are made of plastic, preferably polypropylene. In principle, however, a different design of the frame unit 52b and / or frame unit 144b of the charging coil 54b, which would appear sensible to a specialist, would also be conceivable.The frame unit 52b with the mounted frame unit 144b of the charging coil 54b also features various interconnected geometries for accommodating different internal components of the toothbrush handle 12b. Furthermore, the frame unit 52b has openings and slots for cables and for weight reduction.

[0112] Furthermore, the toothbrush handle 12b has a drive unit 48b, which is housed in the casing 46b, for driving the interface 24b. The drive unit 48b is designed to drive the axis 110b of the interface 24b. The drive unit 48b is a motor. The drive unit 48b is a oscillating armature motor. The frame unit 52b at least partially houses the drive unit 48b. The frame unit 52b houses the drive unit 48b completely. The drive unit 48b is mounted directly in the frame unit 52b. In particular, there is no separate motor assembly. The drive unit 48b has a rotor 58b. The rotor 58b is designed to perform an oscillating movement. The rotor 58b has a one-piece cage element 60b. The cage element 60b is designed to accommodate at least one magnet 62b, 62b'.The cage element 60b is designed to receive two magnets 62b, 62b'. The magnets 62b, 62b' are each formed by permanent magnets. The cage element 60b has a receiving area for each of the magnets 62b, 62b'. Furthermore, the cage element 60b has a base body 64b encompassing at least one receiving area and axial extensions 66b, 68b arranged on both sides of the base body 64b, which form an axis of rotation for the rotor 58b. The axial extensions 66b, 68b are arranged on opposite sides of the base body 64b. A first axial extension 66b is arranged on a side of the base body 64b facing away from the interface 24b. A second axial extension 68b is arranged on a side of the base body 64b facing the interface 24b. The second axial extension 68b is directly coupled to the interface.The second axial extension 68b is designed to provide a rotationally fixed mounting for the axis 110b of the interface 24b. The mounting of the axis 110b can be achieved, for example, by press fit, bonding, or welding. Furthermore, the rotor 58b has at least one cover 70b, 70b', which is designed to close the mounting areas of the cage element 60b. The rotor 58b has at least two covers 70b, 70b', each designed to close one side of the mounting areas of the cage element 60b and, in particular, also to direct the magnetic field. The mounting areas are open on two opposite sides and are closed by means of the covers 70b, 70b' after the magnets 62b, 26b' have been inserted.The covers 70b, 70b' are each screwed, glued, or bolted to the base body 64b of the cage element 60b, or attached by clamping / clicking as described above. During assembly, the first cover 70b is preferably connected to the base body 64b first, then the magnets 62b, 62b' are inserted, and subsequently the second cover 70b' is connected to the base body 64b. Bearings 118b, 120b are then mounted to support the rotor 58b. The rotor 58b is held in a receiving area of ​​the frame unit 52b by its bearings 118b, 120b. The receiving area for the rotor 58b is open on two opposite sides. The covers 70b, 70b' are designed to cover the magnets 62b, 62b' and to distribute a magnetic field from the magnets 62b, 62b'.

[0113] Furthermore, the drive unit 48b includes a return unit. The return unit is constructed in two parts. The return unit is designed to return a rotor 58b to its initial position. The return unit is rotationally fixed to a first axial extension 66b of the rotor 58b and is elastically supported by the frame unit 52b. The return unit has a shaft vane 146b, which is mounted directly axially to a first axial extension 66b of the rotor 58b. The return unit also includes an elastic spring and damping element 148b, which is arranged between the shaft vane 146b and the frame unit 52b. The return unit is formed by the shaft vane 146b and the spring and damping element 148b.

[0114] The wave vane 146b, with its opening (a blind hole), is mounted on or coupled to the first axial extension 66b of the rotor 58b. The resulting dovetail-shaped geometry, as also found in Fig. 57 As can be seen, a rotationally fixed connection is provided between the shaft vane 146b and the first axial extension 66b of the cage element 60b. The connection is preferably designed as an interference fit, but it is also conceivable that the connection is not rigid and that, apart from the radial anti-rotation device, no further axial locking is implemented, since slippage in the axial direction is prevented by the interaction of the other components.

[0115] The wave vane 146b rests on, or is connected to, the spring and damping element 148b. The elastic spring and damping element 148b is rigidly connected to the wave vane 146b. The spring and damping element 148b, in turn, rests on the frame unit 52b, so that, in the assembled state of all elements, the return unit is formed by the interaction of these elements. The spring and damping element 148b is, in particular, rotationally fixed to the frame unit 52b. The return unit rests against the frame unit 52b. The spring and damping element 148b is designed to generate a return force when the wave vane 146b is deflected circumferentially from a rest position. The elastic spring and damping element 148b further exhibits a preload relative to the frame unit 52b in a mounted state, the frame unit 52b forming a bearing surface for the spring and damping element 148b.The shaft vane 146b is preferably formed from a rigid hard component, while the spring and damping element 148b is preferably formed from a soft component, preferably a silicone, with a Shore A hardness of 25 to 75, preferably 35 to 65. This arrangement causes the shaft vane 146b to also deflect when the rotor 58b is deflected, thus pressing the spring and damping element 148b against the frame unit 52b. When the deflection forces decrease, the spring and damping element 148b pushes the shaft vane 146b back into its neutral position. The neutral position is defined as the position without any deflection of the drive.

[0116] In a different configuration, the spring and damping element 148b can also be fixed to an element other than the frame unit 52b. For example, the spring and damping element 148b can rest against or be fixed to a housing, which serves as the fixed point of the application. In this case, the wave vane 146b would be mounted on an axle, and the spring and damping element 148b would rest against / be fixed to the housing. The spring and damping element 148b and the wave vane 146b do not necessarily have to be connected to each other to function. The fixed point provided by the housing enables return to its original position in the application.

[0117] In any application of wave vane 146b and spring and damping element 148b, it must be ensured that the axle, in particular the axle extension 66b, onto which the wave vane 146b is mounted, is sufficiently rigid together with the wave vane 146b and is not bent by the loads during operation.

[0118] The return unit thus designed is particularly intended to carry out a rotation of 2° to 10°, preferably 3° to 7°. The elastic spring and damping element 148b limits a rotation of the shaft vane 146b to a rotation angle of 2° to 10°, preferably 3° to 7°.

[0119] Furthermore, the drive unit 48b has a stator 76b. The stator 76b comprises a one-piece carrier 78b, a laminated core 80b inserted into the carrier 78b, and a coil 82b encompassing the laminated core 80b. The stator 76b includes the one-piece carrier 78b made of a hard component, the laminated core 80b inserted into the carrier 78b, the coil 82b encompassing the laminated core 80b, and a guide vane cover arranged between the coil 82b and the laminated core 80b. The stator 76b is designed as a module. The carrier 78b is formed from a plastic substrate. The carrier 78b is formed from a substantially cuboid substrate which has a cuboid recess on one side for receiving the laminated core 80b. The sheet metal stack 80b has a U-shaped cross-section, with the free ends of the sheet metal stack 80b pointing away from the support.The laminated core 80b consists of a multitude of closely packed guide vanes. The guide vanes are bonded, pressed, snapped, or otherwise connected to the supports 78b. Furthermore, the support 78b has a guide groove on the reverse side of the recesses for receiving the coil 82b. The coil 82b surrounds the support 78b and the laminated core 80b. The coil 82b is wound around the laminated core 80b and the support 78b. The coil 82b is oriented longitudinally. The coil 82b and the laminated core 80b are designed without contact. To insulate the coil 82b from the laminated core 80b on a side facing away from the support 78b, the stator 76b has a concealed insulating plate located between the coil 82b and the laminated core 80b. The insulating plate is formed by a guide vane cover. The insulating plate is made of plastic.The guide plate cover is mounted by snapping, gluing, or similar means. The insulating plate protects the wire of the coil 82b from the edges of the laminated core 80b and prevents a short circuit between the coil 82b and the laminated core 80b. The support 78b of the drive unit 48b is directly connected to the frame unit 52b. The support 78b is screwed to the frame unit 52b. In principle, however, another connection that would seem sensible to a specialist would also be conceivable. The support 78b covers the rotor 58b of the drive unit 48b from one side. The support 78b conceals one open side of the receiving area of ​​the frame unit 52b for the rotor 58b. Furthermore, the laminated core 80b partially protrudes into the receiving area of ​​the rotor 58b. In a mounted state, the laminated core 80b at least partially surrounds the rotor 58b.

[0120] Furthermore, the electric toothbrush handle 12b has a rotor cover 88b. The rotor cover 88b covers the rotor 58b of the drive unit 48b from a side opposite the carrier 78b. The rotor cover 88b also covers a second open side of the receiving area of ​​the frame unit 52b for the rotor 58b. In its assembled state, the rotor 58b is directly surrounded by the stator 76b, the frame unit 52b, and the rotor cover 88b. The rotor cover 88b is made of a plastic part. The rotor cover 88b is firmly connected to the frame unit 52b. The rotor cover 88b is connected to the frame unit 52b opposite the carrier 78b. The rotor cover 88b is screwed to the frame unit 52b. However, in principle, another type of connection that would appear sensible to a person skilled in the art would also be conceivable. The rotor cover 88b, together with the frame unit 52b, is intended for the storage and fixing of the rotor 58b of the drive unit 48b.The rotor cover 88b and the frame unit 52b each form two semicircular axle mounts for the rotor 58b. Each semicircular axle mount is formed by corresponding axle mounts, which together form a complete axle mount. The axle mounts are each designed to support the two axle extensions 66b, 68b of the rotor 58b via bearings 118b, 120b. The bearings 118b, 120b are located in the axle mounts and, in turn, support the axle extensions 66b, 68b of the rotor 58b relative to the frame unit 52b. Various configurations of the bearings 118b, 120b are conceivable that would appear advantageous to a person skilled in the art. The rotor 58b is mounted between the frame unit 52b and the rotor cover 88b. The rotor cover 88b, together with the frame unit 52b, is also intended for the bearing and sealing of the axis 110b of the interface 24b.The rotor cover 88b and the frame unit 52b each form a semicircular axle receptacle for a sealing ring 122b and a bearing 124b for the axle 110b. The axle 110b is mounted between the rotor cover 88b and the frame unit 52b. Various configurations of the bearing 124b are conceivable that would appear practical to a person skilled in the art. For example, the bearing 124b could be a plain bearing made of plastic or the material Iglidur. The rotor cover 88b therefore extends axially from the drive unit 48b to an axle exit point 24b in the housing 46b.

[0121] Furthermore, the electric toothbrush handle 12b has a cover cap 126b. The cover cap 126b is designed to be slid over an axial end of the rotor cover 88b and the frame unit 52b. In its assembled state, the cover cap 126b encompasses the axial end of both the rotor cover 88b and the frame unit 52b. The cover cap 126b serves to further connect and center the rotor cover 88b and the frame unit 52b relative to each other. The cover cap 126b also guides the axis 110b of the interface 24b. The axis 110b passes through the cover cap 126b. Finally, the cover cap 126b seals the interior of the housing against the interface 24b. The cover cap 126b serves to seal between the housing 46b and the frame unit 52b. The cover cap 126b includes a sealing ring 128b for this purpose.

[0122] Furthermore, the return unit, consisting of shaft vane 146b and spring and damping element 148b, serves as a stop element. The stop element is designed to limit the rotation of the rotor 58b of the drive unit 48b from a starting position. The stop element forms an end stop for the rotor 58b during an oscillating drive movement.

[0123] Overall, this stop element presented here can also be combined with other stop elements, such as those present in connection with the embodiment of the invention.

[0124] Furthermore, the toothbrush handle 12b has an energy storage device 50b.1; 50.2 housed in the casing 46b for supplying energy to the drive unit 48b. In the present embodiment, the frame unit 52b accommodates the energy storage device 50b.1; 50.2 at one end in the longitudinal direction. The energy storage device 50b.1; 50.2 is arranged on a side of the drive unit 48b facing away from the interface 24b. The energy storage device 50b.1; 50.2 is guided radially by lateral retaining arms of the frame unit 52b – it is not clamped in this case. Furthermore, longitudinal displacement of the energy storage device 50b.1; 50.2 is prevented by the mounting of the frame unit 144b of the charging coil 54b in conjunction with the charging coil 54b and the compensating element. The energy storage device 50b.1; 50.2 is arranged essentially coaxially to the drive unit 48b in the assembled state. The energy storage device 50b.1; 50.2 is formed by an accumulator, in particular a NiMH accumulator and / or a Li-ion accumulator. However, in principle, another design of the energy storage device 50b.1; 50.2, which would appear sensible to a person skilled in the art, would also be conceivable, such as a battery.

[0125] The electric toothbrush handle 12b also includes a charging coil 54b for charging the energy storage device 50b.1; 50.2. However, charging the energy storage device 50b.1; 50.2 directly via a plug connection would also be conceivable. The charging coil 54b is formed by an induction coil. The charging coil 54b is housed in the fixed frame unit 144b of the charging coil 54b and fixed to the frame unit 52b by means of this frame unit. The frame unit 144b of the charging coil 54b has a receiving area for the positionally fixed mounting of the charging coil 54b. The charging coil 54b is held externally by the frame unit 144b of the charging coil 54b and held in a longitudinal position by means of the compensating element. The position of the charging coil 54b is thus secured both radially and axially. The charging coil 54b is mounted, in particular, along its longitudinal axis. The charging coil 54b is arranged on one side of the energy storage device 50b.1; 50.2 facing away from the drive unit 48b.The charging coil 54b is arranged essentially coaxially with the energy storage device 50b.1; 50.2 and the drive unit 48b. The cover 113b further engages with the charging coil 54b in an assembled state to allow a ferrite core of a charger to be placed inside the coil. The charging coil 54b has, in particular, an inner diameter of 6 mm to 14 mm, preferably 8 mm to 15 mm, and an outer diameter of 12 mm to 19 mm, preferably 14 mm to 17 mm. Furthermore, the charging coil 54b has, in particular, a height of 4 mm to 15 mm, preferably 5 mm to 10 mm.

[0126] Furthermore, the electric toothbrush handle 12b has a circuit board 56b. The circuit board 56b is designed to control the drive unit 48b. In operation, the circuit board 56b is designed to provide a sinusoidal control signal to the drive unit 48b. For this purpose, the circuit board 56b is coupled to the energy storage device 50b.1; 50.2. The energy storage device 50b.1; 50.2 is connected to the actual drive unit 48b via lines through the circuit board 56b, on which the control unit is integrated. The energy storage device 50b.1; 50.2 is connected to the coil 82b, which is wound around the laminated core 80b. The coil 82b does not rest directly on the laminated core 80b, but rather rests on the support 78b on one side and on the guide plate cover on the other. An alternating current is generated in the coil 82b, which causes an alternating polarization to form at the free ends of the laminated core 80b.In rotor 58b, magnets 62b, 62b' are fixedly arranged and mounted by means of covers 70b, 70b', which optimize the field generated by magnets 62b, 62b'. Rotor 58b is rotatably mounted within the laminated core 80b. When the free ends of the laminated core 80b are polarized, rotor 58b tends to realign itself with magnets 62b, 62b' in the field, resulting in movement. If the ends of the laminated core 80b are repolarized, rotor 58b tends to align itself in the opposite direction. This results in an oscillating back-and-forth motion of rotor 58b. The return mechanism on the axis of rotation ensures that rotor 58b returns to a zero position and also provides smoother transitions in movement when the polarization changes. Overall, the reset unit is necessary to make the movements possible at all, since otherwise the forces due to polarization would be so great that no oscillation would be possible.

[0127] The circuit board 56b controls the energy pulses supplied to the drive unit 48b. These parameters are specifically adapted to the drive or product in question. To ensure smooth operation of the drive unit 48b, it is driven sinusoidally rather than with pulses and pauses.

[0128] Furthermore, the circuit board 56b is coupled to the charging coil 54b. The circuit board 56b is designed to control the charging process of the energy storage device 50b.1; 50.2. The circuit board 56b also features an actuating element 136b that can be actuated through a base body 112b of the housing 46b and serves to activate and / or deactivate the toothbrush handle 12b. The actuating element 136b is designed to be actuated through an overmolding 114b of the housing 46b. The circuit board 56b also includes other elements, such as, in particular, conductors, resistors, LEDs, and / or a control unit. The circuit board 56b is also partially positively engaged with the frame unit 52b and extends over a large part of the axial extent of the frame unit 52b. The circuit board 56b extends at least over the energy storage unit 50b.1; 50.2 and the drive unit 48b of the toothbrush handle 12b.For a positive-locking connection of the printed circuit board 56b, the frame unit 52b has several hook-shaped positive-locking elements 138b, which are designed to partially engage the printed circuit board 56b in a mounted state. For mounting, the printed circuit board 56b has recesses 140b corresponding to the positive-locking elements 138b on an outer edge, allowing the printed circuit board 56b to be moved past the positive-locking elements 138b into a final position. Preferably, when mounting the printed circuit board 56b into a final position, it is placed onto the frame unit 52b in a pre-positioned position, allowing the printed circuit board 56b to be guided past the positive-locking elements 138b by means of the recesses 140b. The printed circuit board 56b is then slid under the positive-locking elements 138b and thereby secured. For this purpose, the printed circuit board 56b has separate, small, recesses, not visible, for snapping into the final position.Additionally, the positive locking elements 138b serve as hold-downs, which forcefully secure the circuit board 56b. At one lower end of the circuit board 56b, the frame unit 52b also has a stop with a ramp, which serves for precise positioning of the circuit board 56b.

[0129] Tolerances between the frame unit 52b and its components and the housing 46b must be compensated for so that, on the one hand, the actuating element 136b is in the correct position for actuation through the housing 46b when assembled, and on the other hand, the charging coil 54b is optimally positioned so that the inductive charging process achieves optimal efficiency. Furthermore, tolerances must be compensated for so that the frame unit 52b and the frame unit 144b of the charging coil 54b are firmly seated, in particular without play, in the housing 46b and no noise is generated during operation. According to the invention, length compensation for these tolerances is achieved by the compensating element, for example, a compressible plastic, as is arranged between the charging coil 54b and the energy storage device 50b.1, 50.2. Alternatively, elastic elements could also be integrated into the frame unit 52b to ensure length compensation.For example, flexible elements that are stretched, i.e. bent, when fitting a lid 113b.

[0130] Overall, the frame unit 52b with the charging coil 54b mounted in frame unit 144b can be divided into several zones. The charging coil 54b frame unit 144b has a coil zone. Viewed from below, the coil zone forms the first zone and serves for the direct mounting of the charging coil 54b. Furthermore, the frame unit 52b has a battery zone. The battery zone connects directly to the coil zone and is designed to accommodate the energy storage device 50b.1; 50.2. The frame unit 52b also has a spring zone. The spring zone connects directly to the battery zone on a side opposite the coil zone and is designed to accommodate the reset unit. Finally, the frame unit 52b has a oscillating armature zone. The oscillating armature zone connects directly to the spring zone on a side opposite the coil zone and is designed to accommodate the drive unit 48b.Frame unit 52b is completely open in the area of ​​the vibrating armature zone. Frame unit 52b also has an axle zone. This axle zone connects directly to the vibrating armature zone on the side facing away from the coil zone and is designed to accommodate interface 24b or the axle 110b of interface 24b. Furthermore, frame unit 52b has a printed circuit board (PCB) zone. This PCB zone is located on the front side of the frame unit and is designed to accommodate the printed circuit board 56b.

[0131] The frame unit 52b is primarily assembled from the rear. Only the circuit board 56b and the stator 76b are mounted from the front. Furthermore, the charging coil 54b and a connecting cap are mounted along the longitudinal axis. The drive unit 48b and the energy storage device 50b.1; 50.2 are mounted from the rear of the frame unit 52b.

[0132] According to the invention, in a first step, the entire internal assembly of the electric toothbrush handle 12b is mounted over the frame unit 52b and the frame unit 144b of the charging coil 54b, and then, in a second step, inserted into the housing 46b. The frame unit 52b, with the frame unit 144b of the charging coil 54b mounted, is clamped in the housing 46b. The frame unit 52b has locking lugs that engage in locking recesses in the housing 46b. Subsequently, in a third step, the cover 113b is attached to the housing 46b and secured, thus sealing the internal assembly. The cover 113b can be screwed to the housing 46b or, for example, locked by means of a bayonet fitting.

[0133] In the Figures 57 to 59 Further details on the wave-shaped wing 146b and the spring and damping element 148b will become apparent.

[0134] The shaft vane 146b has a cruciform structure in its top view. A cylindrical body is formed in the center, which features a blind hole 150b with a dovetail-shaped cross-section in the axial direction. This geometry later serves to accommodate the axial extension 66b of the rotor 58b. Furthermore, vanes 152b and 152b' are formed laterally, opposite each other 180° to the axis (symmetrically). The vanes 152b and 152b' are equipped with a through hole 154b and 154b', respectively. An extension 156b is formed in the axial direction, opposite the blind hole 150b, which, in the assembled state, prevents axial displacement within the assembly. To secure the shaft vane 146b on the axial extension 66b of the rotor 58b, a snap nose is formed on the rotor 58b and a snap ring 158b is formed on the shaft vane 146b.

[0135] The extension 156b has a diameter of 1.5 mm to 5 mm, preferably 2.5 mm to 3.5 mm. The length of the extension 156b is 1.5 mm to 5 mm, preferably 2.5 mm to 3.5 mm. The blind hole 150b has a depth of 7 mm to 14 mm, preferably 9 mm to 12 mm. The width of the shaft vane 146b, measured across the vanes 152b, 152b', is between 14 mm and 22 mm, preferably between 17 mm and 19 mm. The outer diameter of the cylindrical body is between 7 mm and 11 mm, preferably between 8 mm and 10 mm.

[0136] The spring and damping element 148b has a semicircular cross-section with lateral flanges 160b, 160b'. On its underside, the element has two projections at the flanges 160b, 160b', which, when assembled, rest on the frame unit 52b. These projections provide elasticity and deformability. Projections 162b, 162b' are also formed on the upper side, adjacent to the geometry for receiving the shaft vane 146b at the flanges 160b, 160b'. These projections 162b, 162b' are fitted into the through holes 154b, 154b' of the shaft vane 146b and hold the two parts together. The projections 162b, 162b' have undercuts that facilitate this assembly. The internal geometry of the spring and damping element 148b is adapted to the external geometry of the wave vane 146b. The geometry is chosen such that the necessary partial rotation of the wave vane 146b is possible.

[0137] The spring and damping element 148b has a length (direction of the drive shaft in the assembled state) of 4 mm to 8 mm, preferably 5 mm to 6.5 mm. Its width perpendicular to this is between 14 mm and 22 mm, preferably between 17 mm and 19 mm. The height – from the rounded section to the projection – is between 6 mm and 11 mm, preferably between 7.5 mm and 9.5 mm. The projections on the underside have a height of 1 mm to 3 mm, preferably between 1.2 mm and 1.8 mm. The projections 162b, 162b' on the upper side have a height of 1.5 mm to 4 mm, preferably between 2 mm and 3.5 mm. The inner diameter of the spring and damping element 148b is between 7 mm and 11 mm, preferably between 8 mm and 10 mm.

[0138] The inner diameter of the spring and damping element 148b and the outer diameter of the cylindrical part of the wave vane 146b are matched in such a way that partial rotation is possible without generating friction losses.

[0139] When assembled in Figure 57 It is evident that the spring and damping element 148b and the wave vane 146b are mounted inside one another, that the spring and damping element 148b rests on the frame unit 52b and generates a preload (shown as an overlap). The contact surface formed on the frame unit 52b can be seen in the sectional view.

[0140] The descriptions given for specific characters can of course also be applied to other characters that show the same or similar characteristics, even if these characteristics are not described in the same level of detail.

Claims

1. An electric toothbrush handpiece having at least one interface (24a; 24b) for coupling to a brush attachment (10a; 10b), having at least one housing (46a; 46b), having at least one drive unit (48a; 48b) for driving the interface (24a; 24b), which is received in the housing (46a; 46b), having at least one energy store (50.1a, 50.2a; 50.1b) for supplying energy to the drive unit (48a; 48b), and having a fix frame unit (52a; 52b) which is arranged in the housing (46a; 46b) and which is implemented as a single piece and which receives the drive unit (48a; 48b) and the energy store (50.1a, 50.2a; 50.1b), wherein the frame unit (52a; 52b) forms multiple receptacle regions at least for the drive unit (48a; 48b) and the energy store (50.1a, 50.2a; 50.1b), which receptacle regions are positioned in a defined manner relative to one another in particular both in an assembled state and in an unassembled state of the frame unit (52a; 52b), wherein the frame unit (52a; 52b) extends axially over the entire drive unit (48a; 48b) and the entire energy store (50.1a, 50.2a; 50.1b), wherein at least one charging coil (54a; 54b) for charging the energy store (50.1a, 50.2a; 50.1b) is received in the fix frame unit (52a; 52b), wherein a compressible length compensation element (57a) for a length compensation for a compensation of tolerances is fitted between the charging coil (54a) and the frame unit (52a).

2. The electric toothbrush handpiece according to claim 1, <b>characterized by a separate frame unit (144b) of the charging coil (54a; 54b), which is installed on the frame unit (52a; 52b), wherein the frame unit (144b) of the charging coil (54a; 54b) carries within the charging coil (54a; 54b) and also a length compensation element (57b), which is pressed by the charging coil (54a; 54b) against the energy store.

3. The electric toothbrush handpiece according to claim 2, characterized in that the separate frame unit (144b) of the charging coil (54a; 54b) is installed on the frame unit (52a; 52b) by a plugging-on process.

4. The electric toothbrush handpiece according to any one of the preceding claims, characterized by a circuit board (56a; 56b) for control of the drive unit (48a; 48b), which circuit board is at least partially received in positively locking fashion by the frame unit (52a; 52b) and extends at least over a large part of an axial extent of the frame unit (52a; 52b).

5. The electric toothbrush handpiece according to claim 4, <b>characterized in that, to receive the circuit board (56a; 56b) in positively locking fashion, the frame unit (52a; 52b) has at least two hook-shaped positive-locking elements (138a; 138b), which are configured for partially engaging over the circuit board (56a; 56b) in an installed state.

6. The electric toothbrush handpiece according to claim 5, <b>characterized in that, for an installation process, the circuit board (56a; 56b) has, on an outer edge, recesses (140a; 140b) which correspond to the positive-locking elements (138a; 138b) and via which the circuit board (56a; 56b) can, for installation thereof, be moved past the positive-locking elements (138a; 138b) into an end position.

7. The electric toothbrush handpiece according to any one of the preceding claims, characterized in that the energy store (50.1a; 50.2a; 50.1b) is clamped radially by lateral holding arms of the frame unit (52a; 52b).

8. The electric toothbrush handpiece according to any one of the preceding claims, characterized by at least one rotor cover (88a; 88b) which is connected fixedly to the frame unit (52a; 52b) and which, together with the frame unit (52a; 52b), is configured for a support and / or fixing of the rotor (58a; 58b) of the drive unit (48a; 48b).

9. The electric toothbrush handpiece according to claim 8, characterized in that the rotor cover (88a; 88b) is screwed to the frame unit (52a; 52b).

10. The electric toothbrush handpiece according to claim 8 or 9, characterized in that the rotor (58a; 58b) is supported between the frame unit (52a; 52b) and the rotor cover (88a; 88b).

11. The electric toothbrush handpiece according to any one of claims 8 to 10, characterized by a covering cap (126a; 126b) which is configured for being pushed over a spindle-side end of the rotor cover (88a; 88b) and of the frame unit (52a; 52b), wherein, in an assembled state, the covering cap (126a; 126b) engages around in each case the spindle-side end of the rotor cover (88a; 88b) and of the frame unit (52a; 52b).

12. The electric toothbrush handpiece according to claim 11, characterized int hat the interface (24a; 24b) comprises a spindle (110a; 110b), wherein the covering cap (126a; 126b) is configured for spindle guidance of the spindle (110a; 110b) of the interface (24a; 24b), wherein, for this purpose, the spindle (110a; 110b) is guided through the covering cap (126a; 126b).

13. The electric toothbrush handpiece at least according to claim 11, characterized in that the covering cap (126a; 126b) serves for sealing off a housing interior with respect to the interface (24a; 24b).

14. A method for producing the electric toothbrush handpiece (12a; 12b) according to any one of the preceding claims, wherein, during a process of assembly of the electric toothbrush handpiece (12a; 12b), in a first step, all of the internal parts are installed via the frame unit (52a; 52b) and are subsequently, in a second step, pressed into the housing (46a; 46b).

15. An electric toothbrush having an electric toothbrush handpiece (12a; 12b) according to any one of claims 1 to 13 and having a brush attachment (10a; 10b).