Vibration sander

Abstract

Vibration grinder (1) comprising a housing (2), a vibration device (3) arranged in the housing (2) by means of which the housing (2) can be at least partially set into vibration, and a grinding element (4) arranged on the housing (2), wherein the grinding element (4) is fixed relative to the housing (2), wherein the grinding element (4) is detachably arranged on the housing (2) by means of at least one magnet (5), and / or wherein the vibration grinder (1) has a pivoting device (6) by means of which a first housing section (7), on which the grinding element (4) is arranged, can be pivoted relative to a second housing section (8).

Description

[0001] The present invention relates to a vibration grinder comprising a housing, a vibration device arranged in the housing by means of which the housing can be at least partially set into vibration, and a grinding element arranged on the housing, wherein the grinding element is fixed relative to the housing.

[0002] Vibration sanders use vibrations to set a grinding element in motion, thus removing material. Vibration sanders are to be distinguished from orbital sanders or similar devices, in which an abrasive is directly moved. In other words, with an orbital sander, the abrasive is directly driven or moved (which can cause vibrations), whereas with a vibration sander, vibrations are first generated, which then set the abrasive in motion.

[0003] These vibration grinders are hand-held tools.

[0004] Vibration sanders are already well-known in the art. The disadvantage of such vibration sanders is that their geometry and shape make working in hard-to-reach places or similar areas difficult or impossible.

[0005] Vibration sanders are also known in which the abrasive is in the form of sandpaper and is detachably attached to the housing via a hook-and-loop fastener. This solution has proven successful for abrasives in the form of sandpaper. However, if abrasives of a different design are to be used, a hook-and-loop fastener is no longer sufficient to ensure adequate attachment of the abrasive to the housing.

[0006] The object of the invention is to at least partially eliminate the disadvantages of the prior art and to provide a vibration grinder that is improved compared to the prior art, in particular wherein the vibration grinder enables easy work in hard-to-reach places and / or wherein a simple and secure attachment of the grinding means to the housing is possible.

[0007] This problem is solved by the features of independent claim 1.

[0008] According to the invention, it is therefore provided that the grinding element is detachably arranged on the housing by means of at least one magnet, and / or that the vibration grinder has a pivoting device by means of which a first housing section, on which the grinding element is arranged, can be pivoted relative to a second housing section.

[0009] Using at least one magnet, it is possible to securely and reliably detachably mount a wide variety of grinding elements on the housing. In particular, this allows for grinding elements in a wide variety of geometric shapes (e.g., cylindrical, conical, torpedo-shaped, or various sections thereof). Depending on the intended use, a suitable grinding element can be used, with the detachable arrangement of the grinding element allowing for easy replacement of the various grinding elements.

[0010] The pivoting design of the vibration sander allows the angle between the first and second housing sections to be adjusted. This allows the geometry and shape of the vibration sander to be adjusted for easy and comfortable work even in hard-to-reach areas (corners, undercuts).

[0011] Further preferred embodiments of the invention are defined in the dependent claims.

[0012] Advantageously, it can be provided that the vibration device has an unbalanced motor for generating a vibration, preferably wherein the unbalanced motor is designed as an electric motor with a flywheel mass mounted eccentrically on a shaft of the electric motor.

[0013] An unbalanced motor provides a simple way to generate vibrations. For the purposes of this application, an unbalanced motor is defined as a rotating machine with an imbalance in a rotating component, causing vibrations when the rotating component rotates. The imbalance can be present, for example, on an output shaft of the rotating machine or directly on a rotor or the like.

[0014] In principle, any type of rotating machine, such as a hydraulic, pneumatic, or electric motor, is suitable for use as an unbalance motor. The use of an electric motor with a flywheel mounted eccentrically on a shaft of the electric motor is particularly advantageous because electric motors are both cost-effective and available in a wide variety of sizes.

[0015] If the unbalance motor has an electric motor, it can be provided that the vibration device has at least one energy storage device, preferably a battery or an accumulator, for supplying the unbalance motor with energy, preferably electrical energy.

[0016] This means that no cables or similar devices are required to supply the vibration sander externally, which greatly improves the handling of the vibration sander.

[0017] It can also be advantageous if the vibration sander is essentially rod-shaped. A rod-shaped vibration sander is easy and safe to handle.

[0018] In a further embodiment, it can be provided that the vibration device is arranged in the first housing section and / or the at least one energy storage device is arranged in the second housing section.

[0019] By separating the vibration device and energy storage unit, the available space in the housing can be optimally utilized. This also optimizes weight distribution within the vibration sander, which in turn benefits comfortable handling.

[0020] Preferably, it can be provided that the first housing section and the second housing section in a pivoted position enclose an angle of 10° to 170°, preferably an interval of 90° to 150°.

[0021] When pivoted, the two housing sections are angled toward each other. This allows the user to hold the vibration sander securely and ergonomically, even when working in hard-to-reach areas, and also provides better access to said hard-to-reach areas.

[0022] Particularly preferably, it can be provided that the pivoting device has a rotary joint which connects the first housing section to the second housing section so as to be rotatable about an axis of rotation, wherein the axis of rotation encloses an angle (β) of 5° to 85°, preferably in a closed interval of 30° to 60°, with a longitudinal extension of the housing.

[0023] A swivel joint is a simple and uncomplicated way to implement a swivel device.

[0024] Advantageously, it can further be provided that the rotary joint has a passage for passing cables, preferably electrical cables, through the rotary joint.

[0025] Thus, for example, cables can be led from the energy storage device in the second housing section to the vibration device in the first housing section.

[0026] It can also be provided that the vibration grinder has an actuating element for actuating the vibration grinder, preferably wherein the actuating element is arranged completely within the second housing section.

[0027] The vibration sander can be operated using the control element. This means that the vibration device can be turned on or off using the control element.

[0028] The actuating element can, for example, be designed as a button and / or as a switch on the housing.

[0029] According to a further embodiment of the invention, it can be provided that the housing has a connecting portion on which the grinding element is arranged, preferably detachably, wherein the connecting portion has a shape corresponding to the grinding element, preferably wherein there is a positive connection between the connecting portion and the grinding element at least in one plane.

[0030] The connecting section provides additional support for the grinding element to the housing. This ensures a stable connection between the grinding element and the housing, even under increased loads and peak loads on the grinding element during operation of the vibration sander.

[0031] Furthermore, it can be provided that the grinding element has, at least in sections, grinding means or means for arranging grinding means on the surface on a surface of the grinding element.

[0032] By arranging the abrasives (e.g., abrasive grains) directly on the surface of the grinding element, grinding elements with complex shapes can also be realized. If the grinding element incorporates means for arranging the abrasives (e.g., sandpaper), only the abrasives need to be replaced when they become worn, rather than the entire grinding element. Means for arranging the abrasives can be, for example, a Velcro fastener or clamping devices for the abrasives.

[0033] Particularly preferably, it can be provided that the grinding element comprises a magnet, wherein a magnet corresponding to the magnet of the grinding element is arranged on or in the housing, preferably in the connecting section.

[0034] By using two magnets, a more secure connection can be created between the grinding element and the housing.

[0035] Furthermore, it can be provided that the housing has a first housing part and a second housing part, wherein the first housing part and the second housing part are connected to one another in a vibration-decoupled manner via a decoupling device, preferably via an elastic vibration damper, preferably wherein the first housing part is arranged completely in the first housing section.

[0036] Due to the vibration decoupling of the second housing part from the first housing part, no or only minimal vibrations occur in the second housing part when the vibration sander is in operation, which ensures comfortable and safe operation of the vibration sander.

[0037] Advantageously, the decoupling device can also have a passage for passing lines, preferably electrical lines, through the decoupling device. Thus, for example, cables or the like can be routed from the first housing part to the second housing part or vice versa.

[0038] Preferably, it can be provided that the vibration device is arranged in the first housing part and / or the grinding means is arranged on the first housing part, and / or wherein the pivoting device is arranged on or in the second housing part.

[0039] If the vibration device is located in the first housing section, the vibration in the second housing section is significantly reduced. Because the pivoting device is located on or in the second housing section, sufficient vibration isolation is ensured while maintaining consistent precision, even in a pivoted state.

[0040] Advantageously, the second housing part can be designed as a handle or has a gripping area. The handle or gripping area can, for example, be rubberized at least in sections. This provides a good grip and additional vibration dampening.

[0041] Further advantages and details of the invention are apparent from the figures and the accompanying description. These show: Fig. 1a shows a schematic plan view of a vibration grinder, Fig. 1b shows a schematic side view of the vibration grinder, Fig. 2 shows a schematic side view of the vibration grinder in a pivoted state, Fig. 3 shows a schematic sectional view of the vibration grinder, and Fig. 4a-d shows various alternative embodiments of a vibration grinder.

[0042] The Fig. 1 shows a schematic plan view of a vibration grinder 1 according to the invention and the Fig. 1b a schematic side view of the vibration grinder 1. The vibration grinder 1 has a housing 2.

[0043] The housing 2 has a first housing part 2a and a second housing part 2b, which are connected via a decoupling device 14. The first housing part 2a and the second housing part 2b are vibrationally decoupled from each other via the decoupling device 14.

[0044] In this case, the decoupling device 14 is implemented as a rubber bridge. However, other designs of the decoupling device 14 are also conceivable.

[0045] The housing 2 is divided into a first housing section 7 and a second housing section 8. The two housing sections 7, 8 can be pivoted relative to each other via a pivoting device 6. In the present embodiment, this is achieved by rotating the two housing sections 7, 8 relative to each other. Further explanations of the pivoting device 6 are provided with reference to the Figur 3 to find.

[0046] It can also be seen that the first housing part 2a is arranged completely in the first housing section 7.

[0047] A cover 2c is provided on the second housing part 2b. The cover 2c can be removed to provide access to an energy storage device 10.

[0048] The vibration sander 1 can be switched on or off using an actuating element 12 in the form of a push button.

[0049] In this embodiment, the second housing part 2b is designed as a handle. Accordingly, rubberized elements or the like can be provided on the second housing part.

[0050] A grinding element 4 is arranged on the first housing part 2a. The grinding element 4 is approximately cylindrical in shape with a tapered base. On the outward-facing surface 4a, the grinding element 4 is provided with an abrasive 4b, in this case with abrasive grains. However, it is conceivable that only a portion of the surface 4a is provided with an abrasive 4b, or that the surface 4a has means (e.g., a hook-and-loop fastener) for arranging the abrasive 4b (e.g., sandpaper).

[0051] The grinding element 4 can have a wide variety of geometries and can thus be adapted to specific applications.

[0052] Basically, the vibration grinder 1 is rod-shaped with a longitudinal extension L.

[0053] The Fig. 2 shows a schematic side view of the vibration sander 1 in a pivoted state. It can be seen that the two housing sections 7, 8 have been pivoted by means of the pivoting device 6 and now enclose an angle α in a range of 10° to 170°. In particular, the angle α in this exemplary embodiment lies in the interval between 90° and 150° and is approximately 110°.

[0054] The Fig. 3 shows a schematic sectional view of the vibration sander 1. It can be seen that the pivoting device 6 has a pivot joint 11. A rotation axis A of the pivot joint 11 forms an angle β with the longitudinal extension L of the vibration sander 1, ranging from 5° to 85°. In this case, the angle is approximately 35°.

[0055] Due to the inclination of the rotation axis A, a rotation of the two housing sections 7, 8 relative to each other also results in a pivoting movement of the two housing sections 7, 8. The Fig. 2 The achievable angle α shown depends on the angle β of the rotation axis A.

[0056] The swivel joint 11 also has a passage 11a, by means of which cables or the like can be passed through the swivel joint 11. The decoupling device 14 also has a passage 14a in this embodiment.

[0057] The pivoting device 6 further comprises two seals 6a in the form of sealing rings, which seal the two housing sections 7, 8 against each other. This prevents contaminants, such as grinding dust, from penetrating the housing 2.

[0058] The vibration device 3 is arranged in the first housing part 2a. The vibration device 3 comprises an unbalanced motor 9, which in this exemplary embodiment is designed as an electric motor 9a with a flywheel 9c eccentrically mounted on a shaft 9b of the electric motor 9a. Due to the eccentric mounting of the flywheel 9c, an imbalance is present on the shaft 9b of the electric motor 9a. When the electric motor 9a is in operation, this imbalance results in vibrations, which are transmitted to the first housing part 2a due to the mounting of the electric motor 9c in the first housing part 2a.

[0059] To supply the unbalanced motor 9 with energy, an energy storage device 10 in the form of two batteries is arranged in the second housing part 2b. The unbalanced motor 9 can then be switched on or off via the actuating element 12. Cables and any control boards or the like are not shown for clarity, but can of course be provided.

[0060] The grinding element 4 is detachably mounted on the first housing part 2a. The grinding element 4 comprises a magnet 5, with a further corresponding magnet 5 provided in the first housing part 2a. The grinding element 4 is thus essentially held by the magnetic attraction between the two magnets 5.

[0061] Of course, embodiments are also conceivable in which the second housing part or the grinding element 4 consist of a magnetic material or have such a magnetic material, which can then be attracted by a magnet 5.

[0062] In addition, the first housing part 2a has a connecting section 13, which has a shape corresponding to the grinding element 4. The connecting section 13 thus fits positively into the grinding element 4, so that at least in one plane E (see Fig. 1a, 1 b ) there is a positive connection between the connecting section 13, and thus the housing 2, and the grinding element 4.

[0063] In this embodiment, the grinding element 4 has a cavity into which the connecting section 13 can be inserted.

[0064] The Fig. 4a bis 4d show various alternative embodiments of a vibration grinder 1. In the embodiment according to Fig. 4a The vibration grinder 4 has a grinding means 4 detachably mounted on the housing 2 by means of magnets. The housing 2 is constructed in one piece, and neither a pivoting device 6 nor a decoupling device 14 is provided.

[0065] The embodiment according to Fig. 4b has a pivoting device 14, but the grinding element 4 is not detachably mounted on the housing 2. A decoupling device 14 is not provided.

[0066] In the embodiment according to Fig. 4c Both a pivoting device 6 and a grinding means 4 detachably arranged on the housing 2 by means of magnets are visible. This embodiment differs from that of the Fig. 1 bis 3 in that no decoupling device 14 is provided.

[0067] The embodiment according to Fig. 4d comprises a decoupling device 14 and a grinding means 4 detachably arranged on the housing 2 by means of magnets. However, no pivoting device 6 is provided here. Legende to the reference numbers:

[0068] 1Vibration sander 2Housing 2afirst housing part 2bsecond Housing part

[0069] 3Vibration device 4Grinding element 4aSurface 4bAbrasive 5Magnet 6Swivel device 6aSeal 7First housing section 8Second Housing section 9Unbalance motor 9aElectric motor 9bShaft 9cFlying mass 10Energy storage 11Swivel joint 11aImplementation 12Actuating element 13Connecting section 14Decoupling device ARotation axis EPlane LLongitudinal extension αAngle βAngle

Claims

1. Vibration grinder (1) comprising a housing (2), a vibration device (3) arranged in the housing (2) by means of which the housing (2) can be at least partially set into vibration, and a grinding element (4) arranged on the housing (2), wherein the grinding element (4) is fixed relative to the housing (2), characterized in that the grinding element (4) is detachably arranged on the housing (2) by means of at least one magnet (5), and / or that the vibration grinder (1) has a pivoting device (6) by means of which a first housing section (7), on which the grinding element (4) is arranged, can be pivoted relative to a second housing section (8).

2. Vibration grinder (1) according to claim 1, wherein the vibration device (3) has an unbalanced motor (9) for generating a vibration, preferably wherein the unbalanced motor (9) is designed as an electric motor (9a) with a flywheel mass (9c) mounted eccentrically on a shaft (4b) of the electric motor (9a).

3. Vibration grinder (1) according to claim 2, wherein the vibration device (3) has at least one energy storage device (10), preferably a battery or an accumulator, for supplying the unbalance motor (4) with, preferably electrical, energy.

4. Vibration grinder (1) according to one of claims 1 to 3, wherein the vibration device (3) is arranged in the first housing section (7) and / or the at least one energy storage device (10) is arranged in the second housing section (8).

5. Vibration grinder (1) according to one of claims 1 to 4, wherein the first housing section (7) and the second housing section (8) in a pivoted position enclose an angle (α) of 10° to 170°, preferably of 90° to 150°.

6. Vibration grinder (1) according to one of claims 1 to 5, wherein the pivoting device (6) has a rotary joint (10) which connects the first housing section (7) to the second housing section (8) so as to be rotatable about an axis of rotation (A), wherein the axis of rotation (A) encloses an angle (β) of 5° to 85°, preferably of 30° to 60°, with a longitudinal extent (L) of the housing (2).

7. Vibration grinder (1) according to claim 6, wherein the rotary joint (11) has a passage (11a) for passing cables, preferably electrical cables, through the rotary joint (11).

8. Vibration grinder according to one of claims 1 to 7, wherein the vibration grinder (1) has an actuating element (12) for actuating the vibration grinder (1), preferably wherein the actuating element (12) is arranged entirely within the second housing section (8).

9. Vibration grinder (1) according to one of claims 1 to 8, wherein the housing (2) has a connecting section (13) on which the grinding element (4) is arranged, preferably detachably, wherein the connecting section (13) has a shape corresponding to the grinding element (4), preferably wherein there is a positive connection between the connecting section (13) and the grinding element (4) at least in one plane (E).

10. Vibration grinder (1) according to one of claims 1 to 9, wherein the grinding element (4) has, at least in sections, grinding means (4b) or means for arranging grinding means on the surface (4a) of the grinding element.

11. Vibration grinder (1) according to one of claims 1 to 10, wherein the grinding element (4) comprises a magnet (5), wherein a magnet (5) corresponding to the magnet (5) of the grinding element (4) is arranged on or in the housing (2), preferably in the connecting section (13).

12. Vibration grinder (1) according to one of claims 1 to 11, wherein the housing (2) has a first housing part (2a) and a second housing part (2b), wherein the first housing part (2a) and the second housing part (2b) are connected to one another in a vibration-decoupled manner via a decoupling device (14), preferably via an elastic vibration damper, preferably wherein the first housing part (2a) is arranged completely in the first housing section (7).

13. Vibration grinder (1) according to claim 12, wherein the decoupling device (14) has a passage (14a) for passing lines, preferably electrical lines, through the decoupling device (14).

14. Vibration grinder according to one of claims 12 or 13, wherein the vibration device (3) is arranged in the first housing part (2a) and / or the grinding means (4) is arranged on the first housing part (2a), and / or wherein the pivoting device (6) is arranged on or in the second housing part (2b).

15. Vibration grinder according to one of claims 12 to 14, wherein the second housing part (2b) is designed as a handle or has a handle area.

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