DE202018100850U1 - Noise-reducing skin treatment device - Google Patents

Abstract

A device for surface treatment of body tissue, comprising: - a device housing (10) having a handle portion (11), - a drive unit disposed in the device housing, having a drive housing (32) supported on the device housing (10, 11, 12), A treatment component (20) projecting from the device housing (10) is mechanically coupled to a drive element (38) of the drive unit that is movable relative to the drive housing, the mechanical coupling being formed between the drive element output element (38) and the treatment component causing movement of the treatment component (20) relative to the device housing (10) by movement of the output member (38) relative to the drive housing (10), characterized in that the drive housing (32) is attached to the device housing (10) via a flexible coupling unit (33a-c) is supported.

Description

FIELD OF THE INVENTION

The invention relates to a device for surface treatment of body tissue comprising: a device housing having a handle portion, a drive unit disposed in the device housing having a drive housing supported on the device housing, a treatment component projecting from the device housing, movable with respect to the drive housing Output element of the drive unit is mechanically coupled, wherein the mechanical coupling between the driven element of the drive unit and the treatment component is formed to effect by movement of the output member relative to the drive housing, a movement of the treatment component relative to the device housing.

Devices of the type described above are used to machine the surface of body parts mechanically. For example, such a device may be used to remove calluses, to polish fingernails, or to massage a care agent into the skin. In principle, grinding, polishing, massaging, cleaning operations on the skin, fingernails, hair and other body parts can be carried out with such devices.

BACKGROUND OF THE INVENTION

Out US 6732394B1 . WO2005 / 109996A2 . WO2006 / 002489A1 . WO2009 / 148729A2 Examples of such treatment devices are previously known. Basically, these treatment devices include a device housing having a handle portion on which a user can grip and hold the device. Disposed on the housing is a treatment component which is caused to rotate, oscillate or otherwise move by a drive unit disposed in the device housing. This treatment component has, for example, an abrasive article and can be brought to the treatment site, ie, for example, a skin site with cornea. The movement of the treatment component then causes a grinding of the cornea.

Out WO2014 / 169237A1 For example, a machining head for such a device is known. Here, an abrasive element is attached to a receiving device which makes a relative movement to the housing of the device to perform the treatment. A damping element is provided between the treatment element designed as a grinding wheel and the receiving element in order to dampen the movements of the head when it moves in the resonance region or near the resonance region. This damping element is designed as a ring from which a plurality of wings extend radially.

In principle, a treatment of the surface of body parts can be carried out with the previously known treatment devices. However, depending on the design of the treatment device, vibrations and noise nuisance may occur due to the drive. According to the inventors, these vibrations and noise nuisances are due to the force exerted by the user on the handle and which presses the treatment component with a force in one direction on the surface to be treated. These forces exerted by the user are superimposed on the driving forces of the treatment device exerted by the drive unit itself and can then lead to corresponding vibrations and noise developments. These vibrations and noise developments can lead to disturbance of the environment and fatigue of the user, with the result that the user can no longer guide and hold the treatment device precisely. There is therefore a need for a treatment device in which this noise is reduced and the invention has for its object to provide such a treatment device.

DESCRIPTION

According to the invention this object is achieved in a device of the type described above by the drive housing is supported on the device housing via a flexible coupling unit.

With the device according to the invention a noise and vibration damped operation is possible. For this purpose, the drive housing is supported on the device housing via a flexible coupling unit. This support may in particular be designed such that the drive housing is decoupled from the device housing. Such decoupling is understood to mean that noise generating frequencies and vibrations generated by the drive unit are not transmitted to the device housing, or at least greatly reduced, transferred to the device housing by receiving these frequencies and vibrations through the flexible coupling unit. The flexible coupling unit allows this relative movement between the device housing and the drive housing to prevent or reduce transmission of the frequencies and vibrations. In particular, the flexible Coupling unit in this case undergo an elastic deformation, which leads to the complete or partial attenuation of the frequencies and vibrations.

A flexible coupling unit here is to be understood as meaning a component or component section which completely or substantially effects the transmission of force from the device housing to the drive housing. The flexible coupling unit is in this case designed such that it does not produce a rigid connection of the drive housing in the device housing itself, but allows movement of the drive housing relative to the device housing. This mobility can be realized by elastic deformation of the flexible coupling unit or by a mechanical mobility, for example a translation or pivoting, which is provided by the flexible coupling unit. Under such a mobility is not the always minimal mobility to understand, which results theoretically by an ever-present low elasticity of a per se rigidly constructed receptacle of the drive housing in the device housing and comes to rest in the range of a few hundredths of a millimeter. Instead, the flexible coupling unit is designed such that it allows movement of at least a few tenths of a millimeter or a few tenths of a degree, preferably also larger movements that can extend over almost one millimeter or more or one angular degree or more. This may be effected by the flexible coupling unit having elastic deformability or by the flexible coupling unit providing translational and / or rotational movement possibilities between its attachment point to the drive housing and its attachment point to the device housing.

The flexible coupling unit may be integrally formed on the device housing or on the drive housing, for example in the form of a leaf spring or a plurality of leaf springs which extend from the device housing or drive housing and are secured at the end of their extension to the corresponding other drive housing or device housing. The flexible coupling unit can also be formed by one or more separate components, which are detachably or non-detachably fastened to the device housing on the one hand and to the drive housing on the other hand. The flexible coupling unit may be made of the same material as the device housing or the drive housing. The flexible coupling unit may be formed of a different material relative to the device housing and / or the drive housing.

The device housing is understood as the enclosure, which encloses relevant drive elements of the device according to the invention. The device housing can be designed for this purpose, for example, waterproof or water-repellent. Basically, the device housing may be composed of a plurality of housing elements, and the device housing may further include projecting portions, fences, shields, or the like.

The drive housing is generally understood as a fixed support structure of a part of the drive elements incorporated in the production and / or transmission, such as gears, rotors, drive belts and the like. The drive housing may be, for example, a stator of an electric motor or a housing of a transmission which is part of or forms part of the drive unit or may be a separate housing which encloses a drive motor and / or a transmission. Preferably, the drive motor is an electric motor. The drive housing may preferably be a transmission housing or a base plate of a transmission and the flexible coupling unit is then preferably connected to the transmission housing or the base plate to mechanically and acoustically decouple it from the device housing through the flexible suspension.

Under the support which is achieved via the flexible coupling unit, it is to be understood that the drive housing is preferably attached to the device housing via the flexible coupling unit. In particular, it is to be understood that preferably no further elements are present which transmit mechanical forces from the drive housing to the device housing during operation, at least no elements which transmit such a force transmission with a lower elasticity, ie lower rigidity, than that by the flexible one Coupling unit provided elasticity. In principle, the drive unit can be embodied by a rigid structure, for example a rigid connection of an engine to a transmission. However, it is preferred if the drive unit comprises a motor and a transmission flexibly coupled to the motor. The support of the drive unit to the device housing via the flexible coupling unit can then be carried out on the transmission or on the engine or on the transmission and engine.

According to a preferred embodiment, it is provided that the flexible coupling unit has a higher flexibility in a first axis than in a second axis different from the first axis. According to this embodiment, the flexible coupling unit comprises a flexible, for example elastic element that has two different axes in two different axes Flexibilities, so for example elasticities or moduli of elasticity, has. This means that the flexible coupling unit allows greater movement when loaded about or along a first axis about this axis or in this axial direction, than a movement about a second axis or in a second axial direction when loaded with the same force around it second axis or in this second axial direction. In principle, a different degree of flexibility is to be understood as meaning that the drive housing, under the action of a force along the first axis, carries out a greater movement in the direction of the first axis relative to the device housing than when a force acts at the same height along the second axis in the direction the second axis moves relative to the device housing. Likewise, a different flexibility is to be understood that the drive housing performs a greater pivot about the first axis relative to the device housing under the action of a moment about a first axis than when a moment acts on the same height about a second axis, about the second axis Axis pivoted relative to the device housing.

For example, the flexible coupling unit may be substantially inflexible and immobile to a translational force along an axis, but flexible and movable relative to a torque acting about the same axis. Such a configuration may be particularly advantageous in order to transmit certain force effects between the drive housing and device housing with a relatively low elasticity, ie a high rigidity, but to transmit other force effects with a high elasticity and thus to attenuate more. In principle, it is preferable, for example, not to forward or diminish the moments, vibrations or forces originating from the drive unit itself by high flexibility of the flexible component about the corresponding axis around which these moments, vibrations or forces act, and thus to the device housing whereas the flexible coupling unit along the axis, in which forces acting on the treatment component by pressing the treatment component onto the body surface, preferably has low flexibility, in particular less flexibility than along or about the axes about which the moments , Vibrations or forces originating from the drive unit itself, act.

Thus, when using an electric motor or a transmission, for example, it may be desirable for the moments occurring in electric motors as cogging torque and gear drives as tooth transmission oscillations and thereby caused vibrations about the axis of rotation, which act in a circumferential direction or tangential direction with respect to the axis of rotation high elasticity of the devicegehöuge decouple, whereas forces act in a direction other than the tangential direction, for example in the axial, radial, axial-radial, axial-tangential or radial-tangential direction, with a lower flexibility or elasticity and consequently higher rigidity of the drive housing the device housing are transferred. Such other force directions may, for example, be exerted by the operator on the treatment component via the device housing. In such a design then a noise that would be triggered by the cogging torque from the electric motor, damped by the high elasticity and therefore does not lead to significant transfer of noise or vibration from the drive housing and at the same time acting on the drive housing force, for example a force acting on the treatment surface by means of a contact force on the treatment component can be absorbed with high rigidity. The transmission of forces in different directions with different elasticities can be effected by geometric shaping or dimensioning of the elastic component or by directed mechanical properties of the material of which the flexible coupling unit or the first elastic element is formed.

In this case, it is even more preferable if the first axis is angled, in particular perpendicular, to the second axis. According to this embodiment, for example, the first axis may be a rotation or oscillation axis of the drive unit, so the movement about this axis as pivoting or rotation in response to a moment about this first axis of rotation or oscillation occur and the second axis can be radial or axial to this Be aligned rotation or oscillation axis, so as a translational movement along a second axis or as a pivot or rotation in response to a moment about a second axis occur.

Furthermore, it is preferred if the drive unit generates a movement of the output element about a first axis of rotation relative to the device housing and that the first axis is not parallel to this axis of rotation. With this embodiment, vibrations that arise around the axis of rotation of the treatment component, can be effectively damped.

Furthermore, it is preferred if the drive unit has a reduction gear and that the first axis is a rotation axis of the reduction gear or a parallel to this Rotation axis of the reduction gear lying axis. With this embodiment, vibrations generated by a reduction gear can be effectively damped. The reduction gear may comprise a plurality of gears and serves to reduce or modulate the rotational speed of an electric motor so that the treatment component moves at a lower rotational speed or reciprocal movement suitable for the application. The reduction gear may in particular have a plurality of gears which mesh and rotate about mutually parallel axes, for example, according to the design of a spur gear or planetary gear. By providing a higher flexibility about the rotational axis of the reduction gear or the rotational axes of the gears of the reduction gear relative to one or two spatial axes perpendicular thereto, the main noise source, which was detected in the rolling process of the gears of the reduction gear, effectively decoupled, thereby achieving an efficient noise reduction without having to hang the treatment component too softly with respect to the user's powers. In this case, the axis of rotation of the reduction gear can also extend at an angle to the axis of rotation of the treatment component.

Still further, it is preferred if the second axis extends radially, axially or radially-axially with respect to the axis of rotation. With this embodiment, stresses that occur due to the pressing of the treatment component on the body surface, can be effectively absorbed, without causing large relative movements between the drive unit and the device housing occur.

Still further, it is preferred if the output element is an output shaft and the axis of rotation of the reduction gear is angled to the axis of rotation of the output shaft. On the one hand, this enables an ergonomic alignment of the treatment component and of the device housing with handle and drive unit arranged therein. In particular, this makes it possible to use a flexible coupling unit which provides a high degree of flexibility about the axis of rotation of the reduction gear with respect to torques transverse to this axis of rotation, for example torques about the axis of rotation of the output shaft but provides a lower degree of flexibility.

In principle, it should be understood that in these embodiments, the flexibility resulting in such directions through the flexible coupling unit composed of the first and second axes as directional components also provides corresponding interpolated flexibility from the flexibility in the first and second axes may have. Furthermore, it should be understood that even in a third axis that is perpendicular to the first and second axes, less flexibility may be provided by the flexible coupling unit than with respect to the first axis or may be equally high with respect to this third axis Flexibility be provided as in relation to the first axis.

Still further, it is preferable if the drive unit comprises an electric motor and a transmission coupled to the electric motor. An electric motor and a coupled to the electric motor gearbox is suitable for a compact design and an overall favorable speed and torque curve of the device according to the invention. The transmission can in particular cause a reduction of the speed to operate the treatment component at a lower speed. Thus, the transmission can effect an effective speed reduction and torque increase, for example, by being designed as a planetary gear. However, the transmission can continue to convert the rotational movement generated by the output shaft of the electric motor, which is coupled to the rotor, into an oscillating motion, for example a rotating back-and-forth motion, a translatory back-and-forth motion or the like to achieve a desired form of exercise of the treatment component. Electric motor and gearbox can be enclosed in a drive housing or a housing of the electric motor or the transmission can form the drive housing. In principle, the fastening of the electric motor or gearbox can be effected via the flexible coupling unit on the device housing and the corresponding other gearbox or the drive motor can be fastened directly to the unit attached in this way. The transmission can also be connected in turn via a flexible coupling with the engine. In this case, for example, the transmission can be fixed to the device housing by means of the flexible coupling unit and the electric motor can be attached to the device housing by means of another, flexible coupling unit or inflexible.

Still further, it is preferable if the flexible coupling unit comprises a spring member extending from a first end to a second end connected to the drive housing at the first end and to the device housing at the second end. Such a connection of a spring element from a first to a second end between the drive housing and the device housing is preferred for the desired elastic coupling between the drive unit and the device housing. In particular, here at the first end a detachable connection be formed between the spring element and the drive housing and / or at the second end a releasable connection between the spring element and the device housing. Such a manner of connection also facilitates the assembly of the drive unit in the device housing. In particular, the spring element can thus be a separate component which is not formed integrally on either the drive housing or the device housing.

It is further preferred if the flexible coupling unit comprises a plurality of spaced spring elements each having a first end connected to the drive housing and including a second end connected to the device housing. By such a plurality of spaced spring elements, an exact positioning and guiding the movement of the drive housing relative to the device housing can be achieved, which is provided by the elastic mobility between the drive housing and device housing. For example, a plurality of distributed over a circumference of a drive housing spring elements can be used to provide a high elasticity in the tangential direction with respect to a cylindrical drive housing and at the same time provide a lower elasticity in the radial and / or axial direction with respect to the central longitudinal axis of the cylindrical drive housing.

Still further, it is preferred if the spring element is a leaf spring, a coil spring, a coil spring or a spring element, which consists of a different material from the device housing, is. Such an embodiment of the spring element has proved to be particularly suitable for achieving an elastic coupling and in this case in particular to produce an elastic preferred direction in which a higher elasticity of the coupling is provided than in different directions.

According to a further preferred embodiment, it is provided that the treatment component has a first abutment surface which is arranged spaced from a first counter-abutment surface arranged on the device housing and the flexibility of the flexible coupling unit is such that the first abutment surface comes into contact with the treatment component under the action of high operating forces comes to the first counter stop surface.

This embodiment addresses a problem identified by the inventors that is directly related to the elastic coupling of the drive unit within the device housing. This elastic coupling basically provides relative mobility of the entire drive unit with respect to the device housing. By this mobility, a treatment component which is connected to the output shaft of the drive unit and also mechanically guided partially or completely, also perform due to the elasticity relative movements to the device housing, beyond those movements, which suitably by the drive unit as a relative movement generated between, for example, a rotor and a stator. These elasticity-related movements of the treatment component can result in undesirable contact or over-deflection of the treatment component with respect to the device housing, and, for example, noise or wear occurs as the treatment component contacts that of the device housing.

According to the invention, this problem is solved in that a stop surface and a counter stop surface are provided at a distance from each other. The abutment surface is formed on the treatment component, the counter-abutment surface is formed on the device housing. If, due to the action of force on, for example, the treatment component, a tilting or translation of the treatment component, which is made possible by the elastic coupling of the drive unit into the device housing and which exceeds a certain level, contact occurs between the stop surface and the counter-abutment surface, so that the movement thereby is limited. It is advantageous in this case that this contact between the treatment component and the device housing takes place, these are in typical design situations and applications, those components which caused due to a speed reduction and reduction by a transmission least relative movement of the moving parts of the device according to the invention. The spacing between the abutment surface and the abutment surface is preferably dimensioned such that, with normal operator forces that a user exerts, an air gap remains between the abutment surface and the abutment surface and only when working with very high operator forces, the user thus sets the treatment component at a very high level Forces force on a body part to be treated, the contact between abutment surface and counter stop surface is made. As an operating force can here be understood both a force which slows down the movement of the treatment component generated by the drive unit and acts, for example, in the circumferential direction of a trained as a disk or cylindrical treatment component. Likewise, as operating forces but also radial, axial, or eccentric-axially acting forces are understood, which are effected by a user by pressing the treatment component to a corresponding part of the body to be treated.

Still further, it is preferred if the first stop surface and the first stop counter surface are arranged so that they limit a movement along the second axis or about the second axis. In particular, according to this embodiment, a movement of the treatment component with respect to the axis to which the lower flexibility is provided by the flexible coupling unit is limited. This may be a limitation in the axial or radial direction with respect to an axis of rotation of the treatment component through the abutment surface and counter-abutment surface. This can be achieved in particular in that the stop surface and the counter stop surface are aligned axially or radially. For example, the abutment surface may be formed by an annular surface which is arranged around the axis of rotation, and the counter abutment surface by a correspondingly opposite annular surface.

Still further, it is preferable that the treatment component has a second abutment surface spaced apart from a second abutment surface disposed on the device housing, and the flexibility of the flexible coupling unit is such that the second abutment surface contacts the treatment component due to high operating forces comes to the second counter-abutment surface, wherein the first abutment surface is not parallel to the second abutment surface. According to this embodiment, a second abutment surface and corresponding second abutment surface is provided, which limits a movement of the drive unit with respect to the device housing in a second, different from the first direction. The provision of two abutment surfaces with two respective mating abutment surfaces can effectively limit the operating forces of the drive unit relative to the device housing due to the elastic coupling of the drive unit in the device housing.

Still further, it is preferred if the drive unit generates a movement of the output element about a first axis relative to the device housing and in that the first stop face an axially aligned surface with respect to the first axis and / or the second stop face a radially oriented surface with respect includes on the first axis. In particular, the second abutment surface can be formed, for example, as a cylindrical circumferential surface about an axis of rotation of the treatment component, which is limited in its movement by a corresponding cylindrical inner peripheral surface as a counter-abutment surface with a larger diameter, which generates a corresponding air gap between abutment surface and counter stop surface. This effectively creates a limitation of mobility in all radial directions about the axis of rotation.

It is even further preferred if the treatment component comprises a carrier element and a treatment surface formed on the carrier element and the first and optionally second stop surface is formed on the carrier element at a distance from the treatment surface. According to this embodiment, the treatment component is constructed in one or more parts and comprises on the one hand a support element which is coupled, for example, to the output shaft of the drive unit and to which a treatment surface is formed directly or can be releasably secured as a separate component having the active surface, with the the treatment is carried out. The first and possibly second stop surface is formed in this case on the carrier element and at a distance from the treatment surface. This prevents the treatment surface from coming into contact with the device housing when excessive deflection occurs due to the elastic coupling due to operating forces.

Finally, it is particularly preferred if the first stop surface and the first abutment abutment surface and optionally the second abutment surface and the second abutment surface are spaced such that upon contact between the first abutment surface and the first abutment surface or contact between the second abutment surface and the second Stop mating surface is the treatment surface spaced from the device housing. According to this embodiment, the geometrical arrangement and spacing of the first and second abutment surfaces are sized from the respective abutment surface such that contact between the treatment surface and the device housing can be safely avoided at any type and level of acting operating forces on the treatment component, and consequently none Abrasive action acts on the device housing, if an abutment surface and counter stop surface come into contact with one another due to excessive operating forces.

list of figures

• 1 eine perspektivische Ansicht von schräg vorne seitlich einer erfindungsgemäßen Behandlungsvorrichtung,
• 2 eine teilgeschnittene perspektivische Ansicht des oberen Abschnitts der Behandlungsvorrichtung der 1,
• 3 eine perspektivische Ansicht der Getriebeaufhängung der Ausführungsform der 1,
• 4a, b eine Draufsicht auf die Getriebeaufhängung der 3 mit Darstellung der Bewegungsmöglichkeiten, und
• 5a-c eine längsgeschnittene, perspektivische Seitenansicht der Bewegungsmöglichkeiten der Behandlungskomponenten der Ausführungsform der 1.

A preferred embodiment will be explained with reference to the accompanying figures. Show it:

• 1 a perspective view obliquely from the front side of a treatment device according to the invention,
• 2 a partially cutaway perspective view of the upper portion of the treatment device of 1 .
• 3 a perspective view of the transmission suspension of the embodiment of 1 .
• 4a, b a plan view of the transmission suspension of 3 with representation of the possibilities of movement, and
• 5a-c a longitudinal sectional side perspective view of the possibilities of movement of the treatment components of the embodiment of the 1 ,

DETAILED FIGURE DESCRIPTION

Referring first to 1 comprises a treatment device according to the invention, which is embodied in the embodiment as a skin care device, a device housing 10 , which is composed of several housing components. These housing components include a handle portion 11 and a housing head 12 in which a recess for a treatment component 20 is arranged.

The housing head 12 encloses the treatment component 20 over an angular extent of more than 180 degrees. The treatment component is disk-shaped and consequently offers a first axial treatment surface 21 and a second radial treatment surface 22 who can serve the treatment. Both treatment areas 21 . 22 are designed as abrasive surfaces. Accordingly, the treatment component may be subject to axial (A) forces in the Y direction and radial (R) forces in the Z direction when the treatment device is in use.

Inside the device housing 10 a drive unit is arranged, which is the treatment component 20 in rotation or in a rotating oscillation about an axis of rotation 100 can put off. The drive unit comprises a drive motor 40 in the handle section 11 is arranged, and a transmission unit 30 in the housing head 12 is arranged. handle portion 11 and housing head are detachably connected to each other, with separation of handle portion 11 and housing head 12 the gear unit remains 30 in the housing head 12 and the drive motor in the grip section 11 ,

2 shows a partial view of the treatment device, which, with partial omission of the representation of the device housing, the transmission unit 30 shows. The gear unit 30 serves to drive a speed of the drive motor designed as an electric motor (not shown), which is located substantially in the handle portion 11 the device housing is located, and as an angle gear to angle the transmission output shaft of the transmission unit relative to the transmission input shaft of the transmission unit. The rotation axis 100 the transmission output shaft 38 the gear unit corresponds to the axis of rotation 100 the treatment component. The rotation axis 101 the transmission input shaft 39 the gear unit corresponds to the axis of rotation of the drive motor.

The gear unit 30 has a transmission base plate 31 which is rigidly and inelastically connected to the device housing. This connection is shown by several screws, for example the screw 31a , realized.

At the gear base plate 31 is a gear carrier plate 32 flexibly attached. 3 shows this attachment in a more understandable way. The flexible attachment of the gear carrier plate 32 is characterized by three flexible elastic spring elements 33a , b, c causes. These flexurally elastic spring elements 33a , b, c are integral with the gear carrier plate 32 formed and extend from a arranged on the gear carrier plate first end 34a , b, c to a second end 35a , b, c. This second end 35a , b, c is fixed by means of a screw on the transmission base plate 31 attached.

The gear unit 30 is detachably connected to a drive motor. This connection between the gear unit and the drive motor is, inter alia, by a detachable and flexible connection of a on the gear carrier plate 32 rotatably mounted transmission input shaft and arranged on the drive motor drive output shaft scored. The drive motor has a stator and a drive motor housing, which rotatably in the handle portion 11 of the device housing 10 is supported. The engine output shaft and the transmission input shaft are rotatable about a transmission axis 101 stored. (Please check this information).

The gear unit comprises a plurality of intermeshing gears, which are parallel to each other and parallel to the axis of rotation 101 rotate lying axes and thereby form a reduction gear. The reduction gear reduces the speed of the drive motor and increases the torque on the transmission output shaft.

The rotation axis 100 the transmission output shaft is not parallel, but angled to the axis of rotation 101 the transmission input shaft or the drive motor. For this purpose, the reduction gear is a Angular gear downstream, that is arranged between the reduction gear and the treatment component. The angle gear can cause an additional reduction. In principle, this arrangement can also be inverted, so the angle gear can be attached directly to the drive motor and the reduction gear between bevel gear and treatment component can be arranged. The angle α between the two axes of rotation 100 . 101 is about 80 ° and in particular may be less than or equal to 90 ° or in a range of 45 ° to 90 °.

The spring elements 33a-c are formed as leaf springs and extend in a circumferential direction with respect to the axis of rotation 101 the transmission input shaft of the transmission and the drive motor, which in 2 corresponds to the axis designated Z axis. They are therefore tangential with respect to this axis of rotation 101 , The spring elements 33a and 33c extend starting from the attachment point 35a , c on the gear base plate 31 in the same circumferential direction whereas the spring element 33b starting from the attachment point 35b extends on the transmission base plate in a circumferential direction opposite thereto. By the orientation of the spring elements 33a-c becomes a high elasticity, so a relatively soft connection of the gear carrier plate 32 to the transmission base plate 31 with respect to a rotation (+ Z and -Z in 4a ) of the gear carrier plate 32 around the axis of rotation 101 and parallel axes relative to the transmission base plate 31 whereas, on the other hand, lower elasticity and consequent high rigidity with respect to rotations around the in 2 shown X-axis and Y-axis is achieved. As a result, vibrations and noises that occur around the axes of rotation of the transmission gears of the reduction gear can be effectively damped.

Furthermore, a higher flexibility in terms of translational movements along the in 4b shown two spatial directions X and Y perpendicular to the axis of rotation 101 compared to the spatial direction along the axis of rotation 101 (Z in 2 ) achieved.

4a shows the higher elastic mobility around the axis of rotation 101 , which can also be called the Z-axis here, compared to the lower flexibility around the X and Y axes. 4b shows the greater flexibility along the two perpendicular to the axis of rotation 101 lying spatial axes Y and X compared to the lower flexibility along the axes Z and the axis of rotation 101 ,

The 5a to 5c show the resulting from this elastic connection between the gear carrier plate and the transmission base plate movabilities of the treatment component 20 relative to the device housing 10 , The treatment component 20 comprises a carrier component 23 and an axial friction surface formed thereon 21 and circumferential friction surface 22 , The treatment component is via a shaft-hub connection 25 connected to the transmission output shaft and thus the gear carrier plate and rotatable with respect to the gear carrier plate 32 stored.

5a shows an unloaded position of the treatment component 20 , In this unloaded position, neither axial A nor radial R force and tangential circumferential force act on the treatment component. The treatment component 20 is in a centered position where it is centered and centered within the border 17 passing through the housing head 12 is displayed lies. 5b shows a contrast loaded situation in which the treatment component is acted upon by a radial force. The treatment component is perpendicular to the axis of rotation 100 shifted in the radial direction, which is due to a translational movement of the gear carrier plate to the transmission base plate along the Z-axis and a pivoting about the X-axis in 2 or by a translational movement of the gear carrier plate to the transmission base plate along the X-axis and a pivoting about the Z-axis in 2 can be caused. One in the area of the hub 25 externally formed stop surface 23a comes into contact with a counter-attack surface 14a in the area of the opening of the housing head 12 through which the transmission output shaft, which drives the treatment component, projects therethrough. The counter-attack surface 14a is as a cylindrical inner peripheral surface on the housing head 12 educated. The stop surface 23a is formed as a cylindrical outer peripheral surface on a support component of the treatment component.

In the in 5b shown deflected position has the treatment element, with the disc-shaped axial end face 21 and the peripheral surface 22 no contact with the housing head 12 ,

5c shows a stressed situation in which the treatment component 20 with an eccentric axial force on the surface 21 of the treatment element or a radially acting force on the treatment surface 22 is charged. As a result of this stress, the treatment component tilts about one perpendicular to the axis of rotation 100 lying on axis, which by pivoting the gear carrier plate to the transmission base plate about the X-axis or the Z-axis in 2 can be caused. This tilt is by a at the bottom of the support element 23 trained, circumferential ring 24 , which has an axially facing abutment surface 24a forms, limited by this stop surface 24a with a counter-attack surface 15a comes into contact. The counter-attack surface 15a is also formed as a circumferential annular surface on the housing head and opposite to the stop surface 24a arranged.

Again arises in the deflected and by the contact of the stop surface 24a to the stop surface 15a limited position no contact between the treatment element and the housing head 12 ,

In principle, a combination of one or more translations and one or more rotations to a stop of the stop surface 23 a or 24a with the counter stop surface 14a . 15a lead and it can also strike both stop surfaces simultaneously to the corresponding counter stop surfaces.

In a purely translational movement of the treatment component along the load direction "user load Y" in 2 For example, according to a translation substantially along the Y-axis and slightly along the Z-axis, an axial stop would occur along the entire circumference of the abutment surface 24a and the counter-attack surface 15a occur.

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• US 6732394 B1 [0003]
• WO 2005/109996 A2 [0003]
• WO 2006/002489 A1 [0003]
• WO 2009/148729 A2 [0003]
• WO 2014/169237 A1 [0004]

Claims (17)

A device for surface treatment of body tissue, comprising: - a device housing (10) having a handle portion (11), - a drive unit disposed in the device housing, having a drive housing (32) supported on the device housing (10, 11, 12), A treatment component (20) projecting from the device housing (10) is mechanically coupled to a drive element (38) of the drive unit that is movable relative to the drive housing, the mechanical coupling being formed between the drive element output element (38) and the treatment component causing movement of the treatment component (20) relative to the device housing (10) by movement of the output member (38) relative to the drive housing (10), characterized in that the drive housing (32) is attached to the device housing (10) via a flexible coupling unit (33a-c) is supported. Device after Claim 1 , characterized in that the flexible coupling unit (33a-c) has a higher flexibility in a first axis (101) than in a second axis (100) different from the first axis. Device after Claim 2 , characterized in that the first axis (101) is angled to the second axis (100). Device after Claim 2 or 3 characterized in that the drive unit generates a movement of the output element (38) about an axis of rotation (100) relative to the device housing (10, 11, 12) and that the first axis is not parallel to this axis of rotation (100). Device after Claim 2 or 3 , characterized in that the drive unit has a reduction gear and that the first axis is an axis of rotation of the reduction gear or an axis parallel to this axis of rotation of the reduction gear axis. Device after Claim 4 or 5 , characterized in that the second axis extends radially, axially or radially-axially with respect to the axis of rotation (100, 101). Device after Claim 5 , characterized in that the output element (38) is an output shaft and the axis of rotation of the reduction gear is angled to the axis of rotation of the output shaft. Device according to one of the preceding claims, characterized in that the drive unit comprises an electric motor (40) and a gear (30) coupled to the electric motor. Device according to one of the preceding claims, characterized in that the flexible coupling unit (33a-c) comprises a spring element which extends from a first end (34a-c) to a second end (35a-c) and which is connected to the first end (34a c) is connected to the drive housing (32) and at the second end to the device housing (31, 12). Device according to one of the preceding claims, characterized in that the flexible coupling unit comprises a plurality of spaced-apart spring elements (33a-c), each having a first end (34a-c) which is connected to the drive housing (32) and a second end (35a-c) connected to the device housing (31, 12). Device after Claim 9 or 10 characterized in that the spring element (33a-c) is a leaf spring, a coil spring, a coil spring or a spring element made of a material different from the device housing. Device according to one of the preceding claims, characterized in that the treatment component (20) has a first abutment surface 24a) spaced from a first counter-abutment surface (15a) disposed on the device housing and the flexibility of the flexible coupling unit (33a-c) is so great in that, under the action of high operating forces on the treatment component, the first abutment surface comes into contact with the first abutment surface. Device according to one of the preceding Claims 2 - 5 and Claim 12 , characterized in that the first abutment surface and the first abutment mating surface are arranged to limit movement along the second axis or about the second axis. Device after Claim 12 or 13 characterized in that the treatment component comprises a second abutment surface (23a) spaced from a second abutment surface (14a) disposed on the device housing, and the flexibility of the flexible coupling unit (33a-c) is such that under the action of high operating forces on the treatment component the second stop surface comes into contact with the second counter stop surface, wherein the first stop surface (24a) is not parallel to the second stop surface (23a). Device after Claim 14 characterized in that the drive unit (30, 40) generates movement of the output element (38) about a first axis (100) relative to the device housing and that - the first stop surface (24a) has an axially aligned surface with respect to the first axis and / or - the second stop surface (23a) comprises a radially oriented surface with respect to the first axis. Device according to one of Claims 12 - 15 characterized in that the treatment component (20) comprises a support member and a treatment surface (21, 22) formed on the support member and the first and optionally second abutment surfaces (23a, 24a) are formed on the support member spaced from the treatment surface (21, 22) is. Device after Claim 16 characterized in that the first abutment surface and the first abutment abutment surface and optionally the second abutment surface and the second abutment abutment surface are spaced such that upon contact between the first abutment surface and the first abutment mating surface or upon contact between the second abutment surface and the second abutment abutment surface the treatment surface ( 21, 22) spaced from the device housing (10, 11, 12).

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