Hand grinder with a vibrating plate

Abstract

Hand-held grinding machine (100) with a vibrating plate (130) to which a grinding plate (140, 150) for receiving a grinding tool (146, 156) can be attached, the grinding plate having a first plate section (140) and a second plate section (150), wherein a first retaining device (240) for releasably attaching the second plate section (150) and a second retaining device (250) for releasably attaching the first plate section (140) are provided on an underside (230) of the vibrating plate (130), wherein at least one of the retaining devices (240, 250) is actuable, wherein the first retaining device (240) has a first elastically deformable retaining element (241) for fixing the second plate section (150) to the vibrating plate (130), characterized in that the second retaining device (250) for holding the first plate section (140) on the The oscillating plate (130) has at least one second elastically deformable retaining element (251),which is designed as a spring clip and on the plate section (140) at least one locking element (141) with a head section is provided, wherein the spring clip (251) is designed to detachably fix the locking element (141) to the swing plate (130) by engaging underneath the head section.

Description

State of the art

[0001] The present invention relates to a hand-held grinding machine with a vibrating plate to which a grinding plate for receiving a grinding tool can be attached, the grinding plate having a first plate section and a second plate section.

[0002] A hand-held sanding machine of this type, designed as a combination sander (orbital and delta sander), is known from the prior art. It has an oscillating base to which a sanding plate can be attached. This sanding plate consists of a first plate section, designed as the body, and a second plate section, designed as the tip section. The second plate section can have individual and specific shapes, e.g., a triangular or delta shape, and is designed as a wear part and is accordingly interchangeably connected to the oscillating base of the hand-held sanding machine. The first plate section, on the other hand, is at least approximately trapezoidal and permanently, i.e., non-interchangeably, connected to the oscillating base of the hand-held sanding machine. Furthermore, DE 103 49 208 A1, for example, discloses a split sanding plate in which a front tip section, as a wear part, is positively connected to a rear body section.DE 200 03 064 U1 discloses a grinding plate that can be releasably locked via a spring mechanism, while DE 601 29 885 T2 describes a modular grinding sole whose parts are joined together by means of a hook and latch connection. Another tool-free exchange system is known from US 2010 / 0048101 A1, in which a spring-loaded wire clip engages in a groove on the grinding plate.

[0003] A disadvantage of the prior art is that the shape of the grinding plate, composed of the first and second plate sections, is limited by the at least approximately trapezoidal shape of the first plate section. This can be disadvantageous depending on the application, for example, if a rectangular grinding plate is required for grinding large surfaces. Disclosure of the invention

[0004] One object of the invention is therefore to provide a new hand-held grinding machine with a vibrating plate to which grinding plates with different geometric shapes can be attached, each of which can be formed from a different number of plate sections.

[0005] This problem is solved by a hand-held grinding machine with the features of claim 1, comprising a vibrating plate to which a grinding plate, designed to hold a grinding tool, can be attached, the grinding plate having a first plate section and a second plate section. A first retaining device for the releasable attachment of the first plate section and a second retaining device for the releasable attachment of the second plate section are provided on the underside of the vibrating plate. At least one of the retaining devices is operable.

[0006] The invention thus makes it possible to detachably attach both a grinding plate consisting of a first and a second plate section, and a grinding plate consisting of a single plate section, to the oscillating plate, since at least one of the two holding devices is operable. In this way, the advantages of a hand-held grinding machine with a square grinding plate and a hand-held grinding machine with a triangular grinding plate can be combined with the described hand-held grinding machine, since both grinding plate shapes can be attached to the described hand-held grinding machine.

[0007] The first holding device preferably has a first, elastically deformable holding element for fixing the first plate section to the vibrating plate.

[0008] In this way, the first holding device is made actuable by elastically deforming the first holding element to replace the first plate section. For elastic deformation, the first holding element can be tensioned or relaxed to replace the first plate section.

[0009] The first retaining element is preferably designed in the form of a ring spring.

[0010] Such a ring spring can be elastically deformed in a simple way by applying a force in the circumferential direction of the ring spring.

[0011] A rigid fixing element can be provided on the first plate section for fixing to the first retaining element.

[0012] This rigid fixing element can be gripped and thus held in place by the first retaining element. If the retaining element is designed, for example, as a ring spring, the rigid fixing element can be shaped like a foot into which the ring spring engages.

[0013] In further training, the first holding device may be assigned an actuating element designed in the style of a hand switch for manual operation.

[0014] In this way, the first and / or second section of the grinding plate can be easily removed without the need for any additional tools.

[0015] In another further development, the second holding device has at least one second elastically deformable holding element to form a positive locking connection acting at an angle to the oscillating plate for holding the second plate section on the oscillating plate.

[0016] The positive locking mechanism holds the second plate section at an angle to the vibrating plate, allowing the positive locking connection to be closed parallel to the vibrating plate.

[0017] Preferably, the second retaining element is designed in the form of a spring clip.

[0018] In this way, the second retaining element for closing the positive locking connection does not need to be moved by a user through manual operation, since the spring clip can be pulled or deformed over a corresponding counterpart of the positive locking connection formed on the second plate section.

[0019] In a further development, at least one deformation element is provided on the second plate section for the elastic deformation of the second retaining member when attaching the second plate section to the vibrating plate.

[0020] In this way, the elastically deformable retaining element can be elastically deformed when the second plate section is placed onto the vibrating plate, thus closing the positive-locking connection. This is particularly advantageous when, instead of a grinding plate with two plate sections, a grinding plate with a single plate section is to be used, which is to utilize both retaining devices for attachment to the vibrating plate. In this case, the positive-locking connection is automatically closed upon insertion, so that only the first retaining device needs to be actuated to secure the grinding plate to the vibrating plate.

[0021] According to the invention, at least one locking element is provided on the second plate section for locking and forming the angularly acting positive locking connection on the second retaining element when attaching the second plate section to the vibrating plate.

[0022] The locking element provides the positive locking connection acting at right angles to the vibrating plate and allows it to be closed or released parallel to the vibrating plate.

[0023] According to one embodiment, the second holding device has at least one deflection bracket on which the second holding element can be deflected in a direction parallel to the oscillating plate by elastic deformation.

[0024] The deflection bracket acts as a fixed bearing against which the second retaining element can be supported. The deflection bracket allows the second retaining element to be tensioned.

[0025] Preferably, the second holding device has at least one centering element which is provided for centering the second plate section in a predetermined position on the vibrating plate.

[0026] The centering element ensures that the second section of the grinding plate is always positioned in a precisely defined location on the vibrating plate. Additionally, the centering element acts as a positive locking element parallel to the vibrating plate. After the elastically deformable retaining element is mounted on the vibrating plate, this element exerts holding forces parallel to the vibrating plate on the second retaining element of the grinding plate, thus holding the grinding plate in a fixed position parallel to the vibrating plate.

[0027] Preferably, the second holding device has at least one alignment element which is provided for aligning the second plate section in a predetermined direction on the vibrating plate.

[0028] In this way, the second plate section is received and aligned at a fixed angular position around the centering element on the vibrating plate.

[0029] According to one embodiment, a hook-like retaining element is formed on the second plate section, by which the second plate section is held on the vibrating plate by the first plate section.

[0030] The hook-like retaining element allows the first plate section to hold the second plate section, so that the second plate section can be attached to the oscillating plate without any further holding effect from the second retaining element.

[0031] According to one embodiment, the grinding plate is formed in one piece with the first plate section and the second plate section.

[0032] Therefore, both single-piece and multi-piece grinding plates can be used with the specified hand grinder.

[0033] The problem mentioned at the outset is also solved by a grinding plate with the features of claim 14 for receiving a grinding tool, which has a first plate section and a second plate section and is designed for attachment to a vibrating plate of a hand-held grinding machine. The first plate section is designed for detachable attachment to a first holding device and the second plate section for detachable attachment to a second holding device, wherein the first and second holding devices are provided on the underside of the vibrating plate and at least one of the holding devices is operable. Brief description of the drawings

[0034] The invention is explained in more detail below with reference to exemplary embodiments illustrated in the drawings. The drawings show: Fig. 1 a perspective view of a hand-held grinding machine with a vibrating plate and a two-part grinding plate attached to it according to one embodiment, Fig. 2 a perspective view of the vibrating plate of Fig. 1, Fig. 3 a perspective view of a first one on the vibrating plate of Fig. 1 attachable sanding plate, Fig. 4 a partial view of a vibrating plate Fig. 1 sanding plate inserted in cross-section, and Fig. 5 a perspective view of a second one on the vibrating plate of Fig. 1 attachable sanding plate. Description of the exemplary implementations

[0035] Fig. Figure 1 shows a hand-held grinding machine 100 equipped with a vibrating plate 130, which, by way of example, has a housing 110 with a handle 107 on which an on / off switch 105 is provided for switching the hand-held grinding machine 100 on and off. An electric motor for driving an eccentric (not shown) is arranged in the housing 110, for example, and is designed to vibrate the vibrating plate 130 when the hand-held grinding machine 100 is in operation. The operating principle and basic construction of a hand-held grinding machine are well known from the prior art and are not the subject of the present invention. Therefore, they are not described further here for the sake of brevity.

[0036] According to one embodiment, the hand-held sander 100 is a cordless combination sander, i.e., a cordless orbital and delta sander, which is mechanically and electrically connected to a battery pack 120 for mains-independent power supply. However, it should be noted that the present invention is not limited to cordless combination sanders, but can rather be applied to various hand-held sanders in which the orbital plate 130 can be used, regardless of whether the hand-held sander can be operated independently of a mains-powered battery pack or via mains power.

[0037] A two-part grinding plate 140, 150 is attached to the vibrating plate 130, which is preferably made of a metallic material. A grinding tool 146, 156, designed, for example, like a grinding sheet, is attached to the grinding plate. The two-part grinding plate comprises a first plate section 140, which is designed as a body section 140, and a second plate section 150, which is designed as a tip section 150. The body section 140 forms, for example, a surface grinding element for processing flat working areas and has, for example, a rectangular or at least approximately trapezoidal base shape to accommodate the comparatively large grinding sheet 146. The body section 140 can be selected, for example, from a plurality of provided plate elements with different sizes, e.g., 1 / 6, 1 / 4, 1 / 3, etc.

[0038] The tip section 150 exemplifies an angle grinding element for processing confined, especially angled, work areas and, for illustrative purposes, has a triangular base shape, also referred to as a triangle shape, to accommodate the comparatively small grinding sheet 156. The tip section 150 can also be selected, for example, from a plurality of provided triangular plate elements of different sizes.

[0039] Body section 140 may have a support plate or, as in Fig. Figure 1 illustrates the design of a carrier plate, preferably made of a torsionally rigid plastic, e.g., polyamide. A connecting plate 144, made, for example, of polyurethane or cellular rubber, can be arranged on this carrier plate and is foamed or glued to the carrier plate. This connecting plate 144 has, for example, a hook-and-loop fastener for detachable connection with the sanding sheet 146. The tip section 150 can similarly have a carrier plate or, as shown in Figure 1, a connecting plate 144. Fig. Figure 1 illustrates the design of a carrier plate, which is also preferably made of a torsionally rigid plastic, e.g., polyamide. A connecting plate 154, made, for example, of polyurethane or cellular rubber, can be arranged on this carrier plate and is either foamed or glued to it. This connecting plate 154 has, for example, a hook-and-loop fastener for detachable connection with the sanding sheet 156.

[0040] It should be noted, however, that the description of the design of the support plates made of a plastic and the vibration plate 130 made of a metallic material is merely exemplary and is not to be understood as a limitation of the invention. Alternatively, for example, the support plates could also be made of a metallic material and the vibration plate 130 of a plastic. In this case, the materials used to realize the support plates and the vibration plate 130 simply need to be selected in such a way that, during operation of the cordless combination grinder 100, the heat generated by the vibrations effectively prevents these materials from fusing and melting.

[0041] According to one embodiment, the body section 140 and the tip section 150 are attached to the vibrating plate 130 independently of each other via associated detachable connections, with the body section 140 and the tip section 150 being arranged, by way of example, on an underside of the vibrating plate 130. To release the detachable connections and thus to remove the grinding plate 140, 150 or the body and / or tip section 140 or 150 from the vibrating plate 130, an actuating element 139, designed in the manner of a hand switch and operable by a user, is provided. This is described in detail below.

[0042] Fig. Figure 2 shows the vibrating plate 130 of the hand grinding machine 100 designed according to one embodiment. Fig. 1, on which the grinding plate 140, 150 consisting of tip and head section 150 or 140 is attached. Fig. 1 can be attached. For this purpose, the oscillating plate 130 has, for example, on its underside 230, an illustrative first holding device 240 for holding the tip section 150 of Fig. 1 and a second holding device 250 for holding the body section 140 of Fig. 1 on.

[0043] The first holding device 240 includes, by way of example, a first holding element 241, which is designed, by way of example, in the form of a ring spring 241. The ring spring 241 can be elastically expanded around its circumference by the actuating element 139. For this purpose, the ring spring 241 has, for example, two radially projecting, pin-shaped elements against which the actuating element 139 engages in the circumferential direction of the ring spring 241 in order to move them apart when the actuating element 139 is manually actuated by a user.

[0044] The second holding device 250 includes, by way of example, a second holding element 251, which is designed, by way of example, as a bow spring 251. This bow spring is shown for illustrative purposes in an elastically deformed state, corresponding to a tensioned state, and in an undeformed state, designated 251', corresponding to a relaxed state. The bow spring 251 has a retaining rod section that is held in a deflection bracket 260. In the tensioned state of the bow spring 251, this section is, by way of example, approximately C-shaped and accordingly bent or tensioned at its axial ends in the direction of the first holding device 240. Extending from the two axial ends of the retaining rod section are, for illustrative purposes, two bows, e.g., L- or U-shaped, which are bent at right angles to each other, at least at their ends opposite the retaining rod section.These right-angled bent ends are arranged in the area of ​​recesses provided in the vibrating plate 130.

[0045] The second holding device 250 further comprises a holding fork 255, the fork teeth of which are directed towards a right-angled end of the retaining spring 251. In this way, the right-angled end of the retaining spring 251, located in the area of ​​the fork teeth, can close an opening between the fork teeth of the holding fork 255. For illustrative purposes, the retaining spring 251, in its tensioned state, closes the opening formed by the fork teeth and, in its relaxed state 251', releases it. However, it should be noted that in Fig. 2 For the sake of simplicity and clarity of the drawing, only one retaining fork 255 is shown at one right-angled end of the bow spring 251; however, alternatively, at least one second retaining fork can also be arranged at the other right-angled end of the bow spring 251. Furthermore, it should be noted that according to one embodiment, the use of the retaining fork 255 can be completely omitted, so that it can be considered an optional component.

[0046] Furthermore, the second holding device 250 includes, for illustrative purposes, a centering element 253 and an alignment element 254, each formed by recesses in the oscillating plate 130. These two elements 253 and 254 will be discussed in more detail later.

[0047] Fig. Figure 3 shows the 130 on the vibrating plate. Fig. 1 attachable sanding plate 140, 150 of Fig. 1, which is designed according to a first embodiment. This embodiment has the body section 140 and the tip section 150 of Fig. 1 on.

[0048] The tip section 150 has, by way of example, a rigid fixing element designed in the manner of a foot 151 on the connecting plate 154, which can be aligned with the oscillating plate 130. This foot 151 comprises, by way of example, a round, cylindrical base, on the side of which radial lugs project away from the connecting plate 154. The foot 151 can be used to fasten the tip section 150 to the oscillating plate 130. Fig. 2 concentrically into the ring spring 241 of Fig. 2 are inserted into the vibrating plate 130, with the ring spring 241 being inserted by the actuating element 139 in the manner already described. Fig. 2 is expanded in its circumference so that the ring spring 241 slides radially over the lugs on the base 151 and can engage the cylindrical base of the base 151. By releasing the actuating element 139 from Fig. 2 and thus the ring spring 241 of Fig. 2. The foot 151 can then be clamped to the ring spring 241. In this way, the tip section 150 is radially and axially secured to the vibrating plate 130 by Fig. 2 held.

[0049] The tip section 150 also has a bearing surface 152 on which a hook-like retaining element 149 formed on the body section 140 can be placed to form a right-angled connection to the oscillating plate 130. Fig. 2. To form a positive fit. This positive fit between the two sections 140 and 150 will be discussed in more detail later.

[0050] In addition to the hook-like retaining element 149, the body section 140 has two pin-shaped and exemplary conical centering elements 143, which are positively engaged in the centering element 253 and alignment element 254 designed as recesses. Fig. 2 are mounted on the vibrating plate 130. The centering element 253 positions the body section 140 at a predetermined position on the vibrating plate 130. Fig. 2 and held in a predetermined angular position on the oscillating plate 130 by the alignment element 254.

[0051] The body section 140 also has two locking elements 141, which are approximately perpendicular to the oscillating plate 130. Fig. 2 moved and accordingly against the bent ends of the bow spring 251 of Fig. 2 or between the bent ends of the spring bar 251 and the retaining fork 255. The ends of the locking elements 141 projecting from the body section 140 widen parallel to the body section 140 such that the locking elements 141 each have a head section, e.g. triangular in cross-section, under which the spring bar 251 of Fig. 2 in its tensioned state engages the locking elements 141 on the vibrating plate 130 of Fig. 2. To be releasably fixed. Alternatively or additionally, the body section 140 can be closed by closing the opening of the retaining fork 255 as described above. Fig. 2 in the tensioned state of the bow spring 251 of Fig. 2 are held between the fork teeth of the retaining fork 255 by the right-angled bent ends of the bow spring 251 in the manner described above.

[0052] Finally, the body section 140 has two sliding elements 142 which, for illustrative purposes, have free ends that are at least partially chamfered or have a triangular cross-section. These serve for the elastic deformation of the retaining rod section of the stirrup spring 251. Fig. 2 in the manner described above when sliding or pressing the body section 140 onto the oscillating plate 130 of Fig. 2, as in Fig. 4 described, and can thus ensure that the retaining fork 255 is closed in the manner already mentioned. In addition, the sliding elements 142 each have a comparatively small locking lug that engages with the retaining rod section of the retaining spring 251. Fig. 3 can lock

[0053] Fig. Figure 4 shows an example of the placement of the grinding plate 140, 150 or the body section 140 of Fig. 3 onto the vibrating plate 130 from Fig. 2. First, the locking elements 141 are inserted into the recesses provided in the oscillating plate 130, in the area of ​​which the right-angled ends of the bow spring 251 are arranged. The body section 140 is held at a slight angle 160 to the oscillating plate 130. Then, the body section 140, with its sliding elements 142, is rotated around the right-angled ends of the bow spring 251 in the direction of the retaining rod section, causing the centering elements 143 on the body section 140 to engage with the centering element 253 and the alignment element 254 on the oscillating plate 130.

[0054] As from Fig. 4 visible and above at Fig. As already described in section 3, the centering elements 143 on the body section 140 and the centering element 253 as well as the alignment element 254 on the vibrating plate 130 are designed, by way of example, at least approximately conically, so that the body section 140 is aligned in the predetermined position and orientation to the vibrating plate 130 when these elements 143, 253, 254 are immersed in each other. From a certain angle 160 of the body section 140 to the rocker plate 130, the sliding elements 142 reach the retaining rod section of the bow spring 251. If the body section 140 is now rotated further around the right-angled ends of the bow spring 251, the bow spring 251 is transferred from its relaxed state to the tensioned state, in which the bow spring 251 engages under the triangular cross-section head sections of the locking elements 141 in order to release the locking elements 141 from the rocker plate 130. Fig. 2. To be releasably fixed, the retaining forks 255, if provided, can be closed in the manner already mentioned, as described above. The sliding elements 142 engage with their locking lugs on the retaining rod section of the retaining spring 251.

[0055] After the body section 140 has been placed on the vibrating plate 130 in the manner described above, the tip section 150 is Fig. 3 as already described placed on the vibrating plate 130 and by the ring spring 241 from Fig. 2 attached to the oscillating plate 130. In this attached state, the hook-like retaining element 149 of the body section 140 is located between the oscillating plate 130 and the tip section 150 of Fig. 3 and rests on its support surface 152, so that the support surface 152 together with the hook-like retaining element 149 forms the aforementioned positive locking mechanism that holds the body section 140 to the oscillating plate 130.

[0056] Thus, the position and location of the body section 140 on the oscillating plate 130 are determined by the positive locking between the centering elements 143 on the body section 140 and, correspondingly, the centering element 253 and the alignment element 254 on the oscillating plate 130. The body section 140 is held perpendicular to the oscillating plate 130 by the bow spring 251 and the locking element 141, in conjunction with or without the retaining fork 255. Rotation of the body section 140 around the bent ends of the bow spring 251 is prevented by the positive locking resulting from the contact surface 152. Fig. 3 and the hook-like retaining element 149.

[0057] Fig. Figure 5 shows an exemplary grinding plate 500, which is designed according to a second embodiment and is designed for detachable attachment to the vibrating plate 130. Fig. 1 instead of the sanding plate 140, 150 from Fig. 3 is provided. This grinding plate 500 is rectangular for illustrative purposes, but can have any other shape.

[0058] As from Fig. As can be seen, the grinding plate 500 has a mounting plate 130 for attachment to the vibration plate. Fig. 2. Illustratively, the same elements that are also used in the sanding plate 140, 150. Fig. 3, and which are not described again here for the sake of brevity and simplicity. In contrast to the sanding plate 140, 150 of Fig. 3, however, the grinding plate 500 is formed in one piece with a single plate section, so that the elements for forming the positive locking between the first and second plate section, i.e. the bearing surface 152 and the hook-like retaining element 149 of Fig. 3 are omitted.

Claims

[1] Hand grinding machine (100) with a vibrating plate (130) to which a grinding plate (140, 150) for receiving a grinding tool (146, 156) can be attached, the grinding plate having a first plate section (140) and a second plate section (150), wherein a first holding device (240) for releasably attaching the second plate section (150) and a second holding device (250) for releasably attaching the first plate section (140) are provided on an underside (230) of the vibrating plate (130), wherein at least one of the holding devices (240, 250) is actuable, wherein the first holding device (240) has a first elastically deformable retaining element (241) for fixing the second plate section (150) to the vibrating plate (130), characterized by, that the second holding device (250) for holding the first plate section (140) on the vibrating plate (130) has at least a second elastically deformable holding element (251) which is designed as a stirrup spring and, on the plate section (140) at least one locking element (141) with a head section is provided, wherein the stirrup spring (251) is designed to detachably fix the locking element (141) to the vibrating plate (130) by engaging underneath the head section. [2] Hand grinding machine according to claim 1, characterized by , that the first retaining element (241) is designed in the manner of a ring spring. [3] Hand grinding machine according to claim 1, characterized by , that a rigid fixing element (151) is provided on the second plate section (150) for fixing to the first retaining element (241). [4] Hand grinding machine according to claim 1 or 2, characterized by, that the first holding device (240) is assigned an actuating element (139) designed in the manner of a hand switch for manual operation. [5] Hand grinding machine according to one of the preceding claims, characterized by , that at least one deformation element (142) is provided on the first plate section (140) for elastic deformation of the second retaining member (251) when attaching the first plate section (140) to the vibrating plate (130). [6] Hand grinding machine according to claim 5, characterized by , that the deformation element (142) of the first plate section (140) has a locking lug which engages with a retaining rod section of the bow spring (251). [7] Hand grinding machine according to one of the preceding claims, characterized bythat the second holding device (250) has at least one deflection bracket (260) on which the second holding member (251) can be deflected by elastic deformation in a direction parallel to the oscillating plate (130). [8] Hand grinding machine according to one of the preceding claims, characterized by , that the second holding device (250) has at least one centering element (253) which is provided for centering the first plate section (140) in a predetermined position on the vibrating plate (130). [9] Hand grinding machine according to one of the preceding claims, characterized by , that the second holding device (250) has at least one alignment element (254) which is provided for aligning the first plate section (140) in a predetermined direction on the vibrating plate (130). [10] Hand grinding machine according to one of the preceding claims, characterized by, that a hook-like retaining element (149) is formed on the first plate section (140), on which the first plate section (140) is held by the second plate section (150) on the vibrating plate (130). [11] Hand grinding machine according to one of the preceding claims, characterized by , that the grinding plate (145, 150) is formed in one piece with the second plate section (150) and the first plate section (140). [12] Hand grinding machine according to one of the preceding claims, characterized by , that, viewed parallel to the body section 140, the head section of the at least one locking element (141) extends in such a way that the locking elements (141) each have a triangular cross-section. [13] Hand grinding machine according to one of claims 3-12, characterized by , that the ring spring 241 can be elastically expanded in its circumference by the actuating member (139). [14] Grinding plate (140, 150; 500) for receiving a grinding tool (146, 156), which has a first plate section (140) and a second plate section (150) and is provided for attachment to a vibrating plate (130) of a hand grinding machine (100), wherein the second plate section (150) is provided for detachable attachment to a first holding device (240) and the first plate section (140) is provided for detachable attachment to a second holding device (250), wherein the first and second holding devices (240, 250) are provided on an underside (230) of the vibrating plate (130) and at least one of the holding devices (240, 250) is actuable, wherein the first holding device (240) has a first elastically deformable retaining element (241) for fixing the second plate section (150) to the vibrating plate (130), characterized by, that at least one locking element (141) with a head section is provided on the first plate section (140), which is designed to cooperate with a second elastically deformable retaining element of the second retaining device (250) designed as a bow spring (251), wherein the bow spring (251) detachably fixes the locking element (141) to the oscillating plate (130) by engaging underneath the head section.

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