Backing pad device

Abstract

The invention relates to a backing pad device (10), in particular for mounting on a hand-held power tool (12), in particular an angle grinder, comprising a base support (14), an interface unit (16) for connecting to an output shaft (18) of the hand-held power tool (12), in particular an angle grinder, and a connection unit (20) for fastening an abrasive disc (22) to the base support (14), which connection unit has at least one connection portion (24) located on the base support (14) and a connection plate (26) which can be releasably connected to the base support (14) and which is provided for form- and / or force-lockingly holding the abrasive disc (22) on the base support (14). According to the invention, the connection unit (20) has at least one locking element (28) mounted on the connection plate (26) and provided for releasably fastening the connection plate (26) to the connection portion (24) in the axial direction, the connection plate (26) having at least one rotary drive element (30, 30') for connection to the base support (14) for conjoint rotation.

Description

[0001] Description

[0002] Support plate device

[0003] State of the art

[0004] A support plate device, in particular for mounting on a hand-held power tool, in particular an angle grinder, with a base support, with an interface unit for connection to an output shaft of the hand-held power tool, in particular an angle grinder, and with a connecting unit for fastening a grinding wheel to the base support, which has at least one connecting section arranged on the base support and a connecting plate which can be detachably connected to the base support and which is intended to hold the grinding wheel positively and / or non-positively on the base support, has already been proposed.

[0005] Furthermore, EP 0 904 896 A2 already discloses a support plate device, in particular for mounting on a hand-held power tool, in particular an angle grinder, with a base support, with an interface unit for connection to an output shaft of the hand-held power tool, in particular an angle grinder.

[0006] Disclosure of the invention

[0007] The invention is based on a support plate device, in particular for mounting on a hand-held power tool, in particular an angle grinder, with a base support, with an interface unit for connection to an output shaft of the hand-held power tool, in particular an angle grinder, and with a connecting unit for fastening a grinding wheel to the base support, which has at least one connecting section arranged on the base support and a connecting plate which can be detachably connected to the base support and which is intended to hold the grinding wheel positively and / or non-positively on the base support.

[0008] It is proposed that the connecting unit has at least one locking element mounted on the connecting plate, which is provided for releasably fixing the connecting plate in the axial direction to the connecting section, wherein the connecting plate has at least one rotary drive element for a rotationally fixed connection to the base support. Preferably, the locking element is provided for fixing the connecting plate to the base support, wherein the connecting plate in turn is provided for fixing a grinding wheel, in particular sandpaper and / or a fiber disc, to the base support. Preferably, the connecting plate is provided for providing fixing in the circumferential direction, while the connecting plate is provided for providing fixing in the axial direction. Preferably, the locking element and the connecting plate are designed to be completely separable from the base support.Preferably, the locking element and the connecting plate are designed to be removed from the base support when changing a grinding wheel. Particularly preferred is the fixing of the grinding wheel to the base support independent of the fixing of the support plate device to the handheld power tool. The connecting unit is, in particular, separate from the interface unit and designed independently of it. The connecting unit can preferably be opened and released regardless of whether the interface unit is connected to a handheld power tool.

[0009] A "backing plate device" is preferably understood to mean at least a part of a backing plate, in particular for a grinding wheel, preferably for fiber discs and / or sandpaper, which is intended for direct mounting on a handheld power tool, in particular an angle grinder. In particular, the backing plate device can also comprise the entire backing plate. The backing plate device is intended, in particular, for direct mounting and attachment to a tool interface of the handheld power tool.The fact that an object is intended for a specific function should preferably be understood to mean that the object fulfills and / or performs this specific function in at least one application and / or operating state. An "operating state" should preferably be understood to mean a state in which the support plate device is ready for a turning operation and / or is at least coupled to the motor and / or the handheld power tool and / or is in a turning operation. A "handheld power tool" should be understood to mean, in particular, a workpiece-processing machine, but advantageously a drill, a hammer drill and / or impact hammer, a saw, a planer, a screwdriver, a milling machine, a grinder, an angle grinder, a gardening tool, and / or a multi-function tool.

[0010] The base support, in particular, forms a base body of the support plate device. Preferably, the base support forms a plate that serves to support a grinding wheel. The base support, in particular, has a plate shape.

[0011] In this context, an “interface unit” should be understood to mean, in particular, a unit which serves for connection to an output shaft of the handheld power tool. The interface unit serves, in particular, for a direct, detachable connection to a tool holder, in particular a tool chuck, of the handheld power tool. The interface unit is arranged, in particular, on a side of the support plate device facing away from a workpiece. The interface unit is, in particular, intended to fasten the support plate device directly to a tool holder of a handheld power tool in a way which is detachable by an operator and at least rotationally fixed. The interface unit is, in particular, formed by an X-Lock interface. The interface unit is preferably compatible with the X-Lock system.Alternatively, it would be conceivable for the interface unit to be formed, for example, by a threaded interface, in particular by an M14 threaded interface. The interface unit preferably has a recess into which a tool holder of the hand-held power tool can engage and fix the support plate device. The interface unit in particular has an interface element which is firmly connected to the base support, in particular a metal sheet, which delimits the recess. Furthermore, a “connecting unit” should be understood in particular as a unit different from the interface unit, which serves for a detachable fastening of a grinding wheel to the grinding plate device, in particular to the base support of the grinding plate device. The connecting unit preferably serves in particular for a tool-free detachable connection of a grinding wheel to the base support of the grinding plate device.Preferably, the grinding wheel is also aligned relative to the base support in a fixed state via the connecting unit. The grinding wheel is provided to be connected to the base support in a rotationally fixed manner by the connecting unit. Preferably, the connecting unit has at least one part that is firmly connected to the base support and at least one part that can be detachably connected to the base support, wherein the at least two parts together form a connection interface that can be detachably connected without tools. Preferably, the connecting unit has at least one connecting section arranged on the base support and a connecting plate that can be detachably connected to the base support, in particular detachably connected to the connecting section, and which is provided to hold the grinding wheel on the base support in a form-fitting and / or force-fitting manner. The grinding wheel is in particular at least partially pressed onto the base support via the connecting plate.The connecting plate serves in particular to fix and center the grinding wheel. The connecting plate is in particular plate-shaped and has at least one rotary drive element. The rotary drive element is in particular intended to engage in a recess on the base support and / or the connecting section and to achieve positive rotary drive. The rotary drive element is in particular formed by an extension. In this context, a "locking element" should be understood in particular to mean an element which is intended to releasably fix the connecting plate in the axial direction to the connecting section. The locking element preferably has at least two operating positions, namely a locking position and an open position.In the open position, the connecting plate is designed to be detachable from the base support, in particular, while in the locking position the connecting plate is firmly connected to the base support. The locking element can be brought into locking engagement with the base support and, for this purpose, has at least one outer contour region which is intended to engage, in particular in a form-fitting and / or force-fitting manner, in a corresponding inner contour region of the connecting section and / or to be encompassed by it. The outer contour region of the locking element is not limited to a specific shape and / or size in order to be able to implement the present invention. The locking element is preferably mounted rotatably and / or pivotably. The locking element is mounted on the connecting plate.The locking element can preferably be brought from an open position into a locking position by means of a first rotary movement and from the locking position into the open position by means of a second rotary movement opposite thereto.

[0012] The inventive design of the backing pad device makes it possible, in particular, to provide a backing pad device which is compatible with various tool interfaces, in particular also with the X-Lock system, regardless of whether the grinding wheel is fastened. Furthermore, the backing pad device according to the invention enables very quick sanding sheet changes. The backing pad device according to the invention does not get very hot on the operating surface of the connecting unit, in particular, and can be handled easily even after work to change the sanding sheet. Furthermore, the connecting unit makes it possible, in particular, to advantageously and reliably fix a grinding wheel. In particular, relative rotation of the grinding wheel can also be avoided. Furthermore, the grinding wheel can be changed, regardless of whether the base support is mounted on a handheld power tool or not.The grinding wheel can either be pre-mounted on the base plate and then mounted on the hand tool, or the base plate can be changed on the hand tool. This is not possible, especially with today's X-Lock backing pad attachments.

[0013] It is further proposed that the locking element and the connecting plate form a closure part, wherein the locking element is captively connected to the connecting plate. Preferably, the locking element is rotatably mounted on and / or in the connecting plate. Preferably, the connecting plate has a central recess in which the locking element is rotatably mounted. In particular, the locking element is designed to be rotatable relative to the connecting plate only within a defined, limited angular range. The closure part is formed in particular by a component which can be detached from the base support and which consists of several parts which are captively connected to one another. This makes it possible, in particular, to keep the number of components which can be lost to a minimum. Furthermore, this makes it possible, in particular, to detach the closure part from the base support in one piece.

[0014] Furthermore, it is proposed that the locking element has at least one closing extension which, in a locking position of the locking element, is provided to at least partially engage behind the connecting section of the connecting unit arranged on the base support. Preferably, the closing extension is rotatable by rotating the entire locking element relative to the connecting plate. Preferably, the at least one closing extension is arranged on a side of the locking element facing the interface unit. The at least one closing extension protrudes in particular radially from a basic shape of the locking element. Preferably, a main extension direction of the closing extension extends perpendicular and / or radially to a rotation axis of the locking element.Preferably, the at least one locking extension is provided to engage behind at least part of the connecting section such that the locking extension is arranged behind the connecting section in a direction parallel to the axis of rotation of the locking element. Preferably, the locking element has at least two locking extensions. A "main extension direction" of an object is to be understood in particular as a direction which runs parallel to a longest edge of a smallest geometric cuboid which just completely encloses the object. This makes it possible, in particular, to achieve an advantageously reliable locking mechanism. In particular, a type of bayonet connection can be provided.

[0015] It is further proposed that the at least one closing extension of the locking element is arranged so as to overlap with the rotary driving element in an open position of the locking element. Preferably, the closing extension is rotatable between an open position and the locking position, wherein the positions each preferably form end positions of the closing extension. However, it would also be conceivable for the locking element to be designed to be infinitely rotatable. Furthermore, it would also be conceivable for the closing extension to be designed to be movable only in the radial direction and to be extendable in the radial direction via a mechanism. Preferably, the at least one closing extension of the locking element is arranged so as to overlap with the rotary driving element in an open position of the locking element in a direction parallel to the axis of rotation of the locking element.In the open position, the closing extension preferably rests directly against an axial end face of the rotary drive element. A locking element is preferably arranged on the at least one rotary drive element, which locks the at least one closing extension in the open position on the rotary drive element. A “locking element” should be understood in particular to mean an element that is intended to be brought into contact with another locking element for locking purposes, so that a locking force can be transmitted via the two locking elements. The locking element can, for example, be designed as a resilient pressure piece that engages a recess in the closing extension in the open position. As a result, the closing extension can be transferred in the open position, in particular, into an advantageously non-interfering stowed position. In particular, snagging can be advantageously avoided.Preferably, during assembly and / or disassembly, it is only necessary to ensure that the rotary drive element is threaded in or out.

[0016] It is further proposed that the connecting plate has at least one stop which is provided to limit a rotational movement of the locking element in at least one direction, in particular an opening direction. Preferably, the closing extension of the locking element can only be rotated to a limited extent between an open position and the locking position, wherein the positions each preferably form end positions of the closing extension. An angular range in which the locking element can be rotated relative to the connecting plate extends in particular from the open position to the locking position. The rotational movement is limited in particular by stops. The stop of the connecting plate defines in particular the open position. Preferably, the closing extension rests against the stop in the open position.In the open position, the closing extension preferably rests with one side on the axial end face of the rotary driving element and with one side on the stop. It is further proposed that the stop is formed by an extension on the rotary driving element and is provided to interact directly with the at least one closing extension to limit the rotational movement of the locking element. The extension protrudes in particular axially from the rotary driving element. Preferably, the extension protrudes from an axial end face of the rotary driving element. This can in particular provide a defined locking and / or opening movement. In particular, over-rotation of the locking element can be avoided. This in turn can advantageously provide a high level of operating comfort. In particular, incorrect operation can be avoided.

[0017] It is further proposed that the connecting unit have an operating lever arranged on the locking element for rotating the locking element. The operating lever forms, in particular, an actuating element. The operating lever is provided for actuating the locking element and, for this purpose, is indirectly or preferably directly coupled to the locking element. The operating lever is intended for manual actuation by a user and, for this purpose, has an advantageously tangible outer contour. A design of the operating lever, in particular of the outer contour, is not limited to a specific shape and / or size in order to be able to implement the present invention. The operating lever is formed, in particular, by a rotary lever, such as, in particular, a rotary wing. Preferably, the operating lever is formed separately from the locking element, but in particular is connected to the locking element.However, it would also be conceivable for the operating lever to be formed integrally with the locking element. The term “integral” should be understood in particular to mean at least materially connected, for example by a welding process, an adhesive process, an injection molding process and / or another process that appears appropriate to a person skilled in the art, and / or advantageously formed in one piece, for example by production from a single casting and / or by production using a single-component or multi-component injection molding process and advantageously from a single blank. This makes it possible, in particular, to advantageously actuate the locking element. In particular, the locking element can advantageously be indirectly gripped and rotated. This makes it possible, in particular, to advantageously handle it.

[0018] Furthermore, it is proposed that the operating lever is pivotably mounted on the locking element, wherein the operating lever has an operating position and a stowed position in which the operating lever is folded against the locking element. Preferably, the operating lever is arranged on a side of the locking element facing away from the closing extension, in particular on the axial side. The operating lever is arranged in particular on a side of the locking element facing the interface unit. Preferably, the locking element has a recess corresponding to the operating lever, in which the operating lever is sunk in the stowed position. The operating lever is formed in particular by a folding handle at least partially recessed into the locking element. Preferably, the operating lever is pivotable back and forth between the operating position and the stowed position.Preferably, a main extension plane of the operating lever in the operating position extends at least substantially parallel to a rotation axis of the locking element. Preferably, a main extension plane of the operating lever in the stowed position extends at least substantially perpendicular to a rotation axis of the locking element. A "main extension plane" of a structural unit is to be understood in particular as a plane which is parallel to a largest side surface of a smallest imaginary cuboid which just completely encloses the structural unit and in particular runs through the center of the cuboid. "Substantially parallel" is to be understood here in particular as an orientation of a direction relative to a reference direction, in particular in a plane, wherein the direction has a deviation from the reference direction of in particular less than 8°, advantageously less than 5° and particularly advantageously less than 2°.This makes it possible to provide, in particular, an advantageously compact operating lever. In particular, an operating lever can be provided that can be advantageously moved into a stowed position. Furthermore, an operating lever can be provided that does not interfere with grinding operations and that advantageously prevents damage to the workpiece caused by the operating lever.

[0019] It is further proposed that the connecting plate have a conical fixing surface for fixing the grinding wheel. Preferably, the base support has a conical surface corresponding to the fixing surface. The conical surface of the base support is, in particular, concave and directed inward and is, in particular, limited to a central region. The connecting plate has, in particular, a truncated cone-shaped basic shape with a central recess. The conical fixing surface serves, in particular, to center and non-positively fix the grinding wheel. This enables, in particular, advantageous fixing of the grinding wheel.

[0020] It is also proposed that the connecting plate have form-fitting extensions on the fixing surface, which are intended to engage in recesses in the grinding wheel. The form-fitting extensions are formed in particular by axially projecting extensions. The form-fitting extensions protrude in particular from the fixing surface in an axial direction facing the interface unit. The form-fitting extensions are preferably formed, for example, by elongated elevations, which are intended to engage in corresponding recesses in the grinding wheel. The form-fitting extensions are preferably formed by radially extending webs, which are arranged distributed in the circumferential direction on the fixing surface. The form-fitting extensions are preferably formed integrally with the fixing surface. This can in particular enable advantageous rotational driving of the grinding wheel.Furthermore, the grinding wheel can be reliably aligned.

[0021] It is further proposed that the connecting section has at least one axial recess for receiving the rotary drive element and at least one radial fixing collar adjacent to the recess, which is intended to be engaged behind by a closing extension of the locking element in a locking position. The base support has in particular a central, axial recess, wherein the connecting section is arranged in a ring around the central recess. The fixing collar projects in particular radially from the base support into the central recess, wherein the fixing collar runs in the circumferential direction on the inside of the base support. The fixing collar extends in particular over an angular range of more than 90° and less than 180°. The at least one recess and the at least one fixing collar preferably border one another.Furthermore, the axial recess of the connecting section directly adjoins the central recess of the base support. Preferably, the connecting section has at least two fixing collars and at least two recesses, wherein the fixing collars and the recesses alternate in the circumferential direction on an outer side of the central recess. This makes it possible, in particular, to provide an advantageous connecting section. Furthermore, in particular, an advantageously reliable locking mechanism can be achieved. In particular, an advantageously reliable locking mechanism can be provided. In particular, a type of bayonet connection can be provided.

[0022] It is further proposed that the fixing collar have at least one stop which is provided to limit a rotational movement of the locking element in at least one direction, in particular a closing direction. Preferably, the closing extension of the locking element can only be rotated to a limited extent between an open position and the locking position, wherein the positions each preferably form end positions of the closing extension. The rotational movement is limited in particular by stops. The stop of the fixing collar defines in particular the locking position. Preferably, the closing extension bears against the stop in the locking position. Preferably, the closing extension bears with one side against an axial end face of the fixing collar and with one side against the stop in the locking position.Preferably, the stop is formed by an extension on the fixing collar and is intended to interact directly with the at least one closing extension to limit the rotational movement of the locking element. The extension protrudes, in particular, axially from the fixing collar. Preferably, the extension protrudes from an axial end face of the fixing collar. This makes it possible, in particular, to provide a defined locking and / or opening movement. In particular, over-tightening of the locking element can be avoided. This, in turn, makes it possible to provide an advantageously high level of operating comfort. In particular, incorrect operation can be avoided.

[0023] It is further proposed that the connecting section be connected to the base support in one piece, in particular as a single part. Advantageously, the term "one piece" should also be understood to mean "one-piece". The term "one-piece" should in particular be understood to mean "molded in one piece". Preferably, this one piece is produced from a single blank, a mass and / or a cast, particularly preferably using an injection molding process, in particular a single- and / or multi-component injection molding process. This advantageously allows the number of components to be kept low. Furthermore, an advantageous integration of the connecting unit into the base support can be achieved.

[0024] Furthermore, a hand-held power tool system with a hand-held power tool, in particular an angle grinder, and with the support plate device is proposed.

[0025] Furthermore, a closure part of the support plate device is proposed.

[0026] The support plate device according to the invention is not intended to be limited to the application and embodiment described above. In particular, the support plate device according to the invention may comprise a number of individual elements, components, and units that differs from the number stated herein to fulfill a function described herein. Furthermore, in the value ranges specified in this disclosure, values ​​within the stated limits are also to be considered disclosed and can be used arbitrarily.

[0027] drawing

[0028] Further advantages will become apparent from the following description of the drawings. The drawings illustrate an exemplary embodiment of the invention. The drawings, the description, and the claims contain numerous features in combination. Those skilled in the art will also expediently consider the features individually and combine them into useful further combinations.

[0029] They show:

[0030] Fig. 1 shows a hand-held power tool system with a hand-held power tool, with a support plate device according to the invention and with a grinding wheel in a schematic representation,

[0031] Fig. 2 shows a partial section of the hand-held power tool system with the hand-held power tool, with the support plate device according to the invention, which has a base support and a locking unit, and with the grinding wheel in a schematic representation,

[0032] Fig. 3 shows a partial section of the hand-held power tool system with the hand-held power tool, with the support plate device according to the invention, which has the base support, the locking unit and an interface unit, and with the grinding wheel in a schematic sectional view,

[0033] Fig. 4 shows the support plate device according to the invention with the base support, with the locking unit, which has a closure part, and with the interface unit, and the grinding wheel in a schematic sectional view,

[0034] Fig. 5 shows the support plate device according to the invention with the base support, with the locking unit, and with the interface unit in a schematic representation,

[0035] Fig. 6 shows the support plate device according to the invention with the base support, with the locking unit, which has a closure part, and with the interface unit, and the grinding wheel in a schematic exploded view,

[0036] Fig. 7 shows a locking element and a connecting plate of the locking unit of the support plate device according to the invention in an open position, Fig. 8 shows a locking element and a connecting plate of the locking unit of the support plate device according to the invention in a locking position,

[0037] Fig. 9 shows a partial section of the support plate device according to the invention with the locking unit, which has the locking element, the connecting plate and a connecting section, in an open position and

[0038] Fig. 10 shows a partial section of the support plate device according to the invention with the locking unit, which has the locking element, the connecting plate and the connecting section, in a locking position.

[0039] Description of the embodiment

[0040] Fig. 1 shows a handheld power tool system with a handheld power tool 12, which has a housing 56, with a backing plate device 10 and with an insert tool in the form of a grinding wheel 22, in particular a fiber disc. The handheld power tool 12 is designed as an angle grinder. However, another design that would appear expedient to a person skilled in the art would also be conceivable. The grinding wheel 22 has a connecting device 58 (cf. Fig. 6). The connecting device 58 comprises a continuous, central recess 60, which is adjoined by several, in particular six, narrow recesses 46 extending radially outward. Furthermore, the connecting device 58 comprises two rotary drive recesses 62, which extend radially outward from the central recess 60 and directly adjoin the central recess 60. The two rotary drive recesses 62 are arranged opposite one another.The two rotary drive recesses 62 and the narrow recesses 46 are evenly distributed in the circumferential direction. The handheld power tool 12 has a drive unit 64. The drive unit 64 is provided at least to provide kinetic energy, which is provided to move, in particular to rotate, the backing plate device 10 and, via the backing plate device 10, the grinding wheel 22. The drive unit 64 is arranged in the housing 56. The handheld power tool 12 further has a gear 66, in particular an angular gear, and an output shaft 18. The drive unit 64 is provided to drive the output shaft 18 in rotation via the gear 66. Furthermore, the handheld power tool 12 has a quick-action clamping device 68. The quick-action clamping device 68 is provided to arrange the backing plate device 10 or other insert tools on the handheld power tool 12.The quick-clamping device 68 is arranged on the output shaft 18. The handheld power tool 12 has an actuating means 70 for opening and closing the quick-clamping device 68. The actuating means 70 is designed as a pull lever. The pull lever has an eccentric. The actuating means 70 is provided, in particular by means of the eccentric, to move a release bolt 72 (cf. Fig. 3) of the quick-clamping device 68 in the axial direction. The release bolt 72 is provided to unlock the quick-clamping device 68 when the release bolt 72 moves into the housing 56 of the handheld power tool 12. When the quick-clamping device 68 is locked, the release bolt 72 moves out of the housing 56 of the handheld power tool 12. The actuating means 70 shown in Figures 1 and 3 is in a closed state.The quick-release device 68 is embodied, for example, by an X-Lock quick-release device. However, other clamping devices that would be considered appropriate by a person skilled in the art, in particular quick-release devices, are also conceivable.

[0041] The backing plate device 10 is intended for mounting on the handheld power tool 12. The backing plate device 10 has a base support 14. The base support 14 forms a base body of the backing plate device 10. The base support 14 forms a plate which serves to support a grinding wheel 22. The base support 14 has a plate shape, in particular a circular one. However, other shapes for the base support 14 that would appear appropriate to a person skilled in the art are also conceivable. The base support 14 has a central, circular-cylindrical fastening area 74 with a central recess. Furthermore, the base support 14 has an edge area 76 which adjoins the fastening area 74 radially outward and extends as a ring around the fastening area 74. The edge area 76 has, in particular, a thinner material thickness than the fastening area 74.The base support 14 has a support surface 80 on a side facing away from the handheld power tool 12 for supporting the grinding wheel 22. The support surface 80 extends over the edge region 76 and the fastening region 74. The base support 14 is made of a plastic and / or preferably an elastomer. The base support 14 is flexible.

[0042] Furthermore, the support plate device 10 has an interface unit 16 for connection to the output shaft 18 of the handheld power tool 12. The interface unit 16 serves for a direct, detachable connection to the quick-action clamping device 68 of the handheld power tool 12. The interface unit 16 is arranged on a side of the base support 14 of the support plate device 10 facing away from the support surface 80. The interface unit 16 has an interface element 82 which is firmly connected to the base support 14 and has a central recess. The interface element 82 is directly connected, in particular screwed, to the fastening area 74 of the base support 14. The interface element 82 is formed from a metal sheet.The interface unit 16 is provided for attaching the support plate device 10 directly to the quick-action clamping device 68 of the handheld power tool 12, at least in a rotationally fixed manner, in a manner that can be releasably and securely removed by an operator, and thus for connecting the support plate device 10 in a rotationally fixed manner to the output shaft 18. The interface unit 16 is formed, for example, by an X-Lock interface. Preferably, the interface unit 16 is compatible with the X-Lock system. For this purpose, the interface unit 16 has a recess in the interface element 82, into which clamping jaws of the quick-action clamping device 68 of the handheld power tool 12 can engage and secure the support plate device 10.

[0043] In an alternative embodiment, it would be conceivable for the interface unit 16 to have an internal thread, in particular an M14 internal thread, and to be designed to be mounted on a handheld power tool 12, in particular an angle grinder, with an M14 spindle. Instead of the X-Lock interface, an M14 thread is integrated into the base support 14. This allows the grinding wheel 22 on the base support 14 to be changed quickly and easily without having to unscrew the entire backing plate device 10, as is necessary with current backing plate devices. Furthermore, the backing plate device 10 has a connecting unit 20 for fastening the grinding wheel 22 to the base support 14. The connecting unit 20 is separate from the interface unit 16 and designed independently of it. The connecting unit 20 serves to connect the grinding wheel 22 to the base support 14 of the backing plate device 10 in a way that can be released without the need for tools.In a fixed state, the grinding wheel 22 is also aligned and centered relative to the base support 14 via the connecting unit 20. The grinding wheel 22 is intended to be connected to the base support 14 in a rotationally fixed manner by the connecting unit 20. The connecting unit 20 has a connecting section 24 arranged on the base support 14 and a connecting plate 26 that can be detachably connected to the base support 14. The connecting section 24 is arranged in the central recess of the base support 14 and directly adjoins an inner wall of the fastening region 74 that delimits the central recess. The connecting section 24 is connected in one piece to the base support 14. The connecting section 24 is formed in one piece with the base support 14. The connecting plate 26 is intended to hold the grinding wheel 22 positively and non-positively to the base support 14.The connecting plate 26 serves to fix and center the grinding wheel 22. The connecting plate 26 is made of metal for reasons of robustness. The connecting plate 26 presses the grinding wheel 22 against the base support 14 in the assembled state. The connecting plate 26 has at least one rotary drive element 30, 30' for a rotationally fixed connection to the base support 14. The connecting plate 26 has, for example, two rotary drive elements 30, 30' for a rotationally fixed connection to the base support 14. The rotary drive elements 30, 30' are provided to engage in recesses in the connecting section 24 and to achieve positive rotational drive. The rotary drive elements 30, 30' are each formed by an extension. The rotary drive elements 30, 30' are each formed by a cuboid extension.The connecting section 24 has two axial recesses 48, 48' for receiving one of the rotary drive elements 30, 30'. The axial recesses 48, 48' are designed to correspond to the rotary drive elements 30, 30'.

[0044] The connecting plate 26 has a conical fixing surface 42 for fixing the grinding wheel 22. The base support 14 has a conical surface corresponding to the fixing surface 42. The support surface 80 is conical in the fastening region 74. The conical section of the support surface 80 of the base support 14 is concavely directed inwards. The connecting plate 26 has a truncated cone-shaped basic shape with a central recess. The connecting plate 26 is annular. The conical fixing surface 42 serves to center and non-positively fix the grinding wheel 22. Furthermore, the connecting plate 26 has form-fitting extensions 44 on the fixing surface 42, which are intended to engage in the narrow recesses 46 of the grinding wheel 22. The form-fitting extensions 44 are formed by axially projecting extensions.The form-locking extensions 44 protrude from the fixing surface 42 in an axial direction facing the interface unit 16. The form-locking extensions 44 are formed, for example, by elongated elevations intended to engage in the corresponding, narrow recesses of the grinding wheel 22. The form-locking extensions 44 are formed by radially extending webs arranged distributed in the circumferential direction on the fixing surface 42. The form-locking extensions 44 are formed integrally with the fixing surface 42. The connecting plate 26 has, for example, six form-locking extensions 44. The two rotary drive elements 30, 30' are also arranged on the fixing surface 42 and each protrude in the axial direction from the fixing surface 42. The two rotary drive elements 30, 30' protrude from the fixing surface 42 in an axial direction facing the interface unit 16. The two rotary drive elements 30, 30' are arranged opposite one another.In the circumferential direction, the two rotary drive elements 30, 30' and form-locking extensions 44 are arranged evenly distributed on the fixing surface 42. In an assembled state of the grinding wheel 22, the two rotary drive elements 30, 30' and form-locking extensions 44 each engage through the rotary drive recesses 62 and the narrow recesses 46 of the grinding wheel 22 and cause the grinding wheel 22 to rotate.

[0045] The connecting unit 20 further comprises a locking element 28 mounted on the connecting plate 26, which is provided for releasably fixing the connecting plate 26 to the connecting section 24 in the axial direction. The locking element 28 is provided for fixing the connecting plate 26 to the base support 14, wherein the connecting plate 26 is in turn provided for fixing a grinding wheel 22 to the base support 14. The locking element 28 has two operating positions, namely a locking position (see Figures 2, 8 and 10) and an open position (see Figures 6, 7 and 9). In the open position, the connecting plate 26 is designed to be releasable from the base support 14, wherein the connecting plate 26 is firmly connected to the base support 14 in the locking position.The locking element 28 can be moved from an open position into a locking position by means of a first rotary movement in the closing direction 54 and from the locking position into the open position by means of a second rotary movement opposite thereto in the opening direction 38. The locking element 28 is mounted on the connecting plate 26. The locking element 28 is rotatably mounted in the connecting plate 26. The locking element 28 is rotatably mounted in the central recess of the connecting plate 26. The connecting plate 26 encloses the locking element 28 in a ring shape. The locking element 28 is designed to be rotatable relative to the connecting plate 26 only within a defined, limited angular range. The locking element 28 and the connecting plate 26 together form a closure part 32, wherein the locking element 28 is captively connected to the connecting plate 26.The locking part 32 is formed by a component that can be detached from the base support 14. The locking part 32, as an assembly, takes over the torque transmission of the grinding wheel 22 to the base support 14 with the form-locking extensions 44 and the rotary drive elements 30, 30', as well as the axial positioning of the grinding wheel 22 relative to the base support 14 with the cone.

[0046] The locking element 28 has at least one locking extension 34, 34'. The locking element 28 has, for example, two locking extensions 34, 34'. In a locking position of the locking element 28, the locking extensions 34, 34' are provided to at least partially engage behind the connecting section 24 of the connecting unit 20. The locking extensions 34, 34' are arranged on a side of the locking element 28 facing the interface unit 16. The locking extensions 34, 34' each protrude radially from a basic shape of the locking element 28. A main direction of extension of the locking extensions 34, 34' extends perpendicularly and radially to a rotation axis 84 of the locking element 28. The locking extensions 34, 34' are connected to one another in one piece. The closing extensions 34, 34' are connected to one another via a central disc 86, wherein the closing extensions 34, 34' are each connected in one piece to the disc 86.The disc 86 is, for example, screwed to a cylindrical base body 88 of the locking element 28. However, it would also be conceivable for the locking extensions 34, 34' to be molded directly onto the base body 88. The locking extensions 34, 34' and the disc 86 consist of a metal sheet. However, other designs would also be conceivable. The locking extensions 34, 34' are each arranged on opposite sides of the disc 86. The disc 86 and the locking extensions 34, 34' are symmetrically designed. The disc 86 and the locking extensions 34, 34' form a locking plate. The locking plate connects to the base support 14 by rotation according to the principle of a bayonet lock.

[0047] The locking extensions 34, 34' are each provided to engage behind at least a portion of the connecting section 24 such that the locking extensions 34, 34' are arranged behind the connecting section 24 in a direction parallel to the rotational axis 84 of the locking element 28. Furthermore, in an open position of the locking element 28, the locking extensions 34, 34' of the locking element 28 are arranged overlapping the rotary drive elements 30, 30'. The locking extensions 34, 34' are rotatable between an open position and the locking position, wherein the positions each form end positions of the locking extensions 34, 34'. In the open position of the locking element 28, the locking extensions 34, 34' are arranged in a direction parallel to the rotational axis 84 of the locking element 28, overlapping the rotational driving elements 30, 30'.In the open position, the locking extensions 34, 34' each rest directly against an axial end face of one of the rotary drive elements 30, 30'. Furthermore, a locking element 94, 94' is arranged on each of the rotary drive elements 30, 30', which locks the respective locking extension 34, 34' in the open position on the rotary drive element 30, 30'. The locking elements 94, 94' are each designed, for example, as a resilient pressure piece, which engages a recess in the respective locking extension 34, 34' in the open position. The locking elements 94, 94' are preferably screwed into the rotary drive elements 30, 30'. The locking elements 94, 94' hold the strike plate in the open position relative to the connecting plate 26.The connecting section 24 further comprises two radial fixing collars 50, 50' adjacent to the recesses 48, 48' for receiving the rotary drive elements 30, 30', which are intended to be engaged behind by one of the closing extensions 34, 34' of the locking element 28 in the locking position. The base support 14 has the central, axial recess, with the connecting section 24 being arranged in a ring around the central recess. The fixing collars 50, 50' protrude radially from the base support 14 into the central recess, with the fixing collars 50, 50' extending circumferentially on the inside of the base support 14. The fixing collars 50, 50' each extend on opposite sides over an angular range of more than 90° and less than 180°. The recesses 48, 48' for receiving the rotary drive elements 30, 30' are each arranged in the circumferential direction between the fixing collars 50, 50'.The fixing collars 50, 50' and the recesses 48, 48' extend alternately in the circumferential direction on an outer side of the central recess.

[0048] Furthermore, the connecting plate 26 has at least one stop 36, 36', which is provided to limit a rotational movement of the locking element 28 in an opening direction 38. The connecting plate 26 has two stops 36, 36', which are provided to limit a rotational movement of the locking element 28 in an opening direction 38. The stops 36, 36' are provided to interact directly with the closing extensions 34, 34' to limit the rotational movement of the locking element 28. The stops 36, 36' of the connecting plate define the open position. In the open position, the closing extensions 34, 34' each rest against one of the stops 36, 36'. In the open position, the closing extensions 34, 34' rest with one side on the axial end face of one of the rotary drive elements 30, 30' and with one side on one of the stops 36, 36'.The stops 36, 36' are each formed by an extension on one of the rotary drive elements 30, 30'. The extensions each protrude axially from the rotary drive elements 30, 30'. The extensions each protrude from the axial end face of the respective rotary drive element 30, 30'.

[0049] The fixing collars 50, 50' each have a stop 52, 52', each of which is provided to limit a rotational movement of the locking element 28 in a closing direction 54. The stops 52, 52' of the fixing collars 50, 50' define the locking position. In the locking position, the closing extensions 34, 34' rest against the stops 52, 52' of the fixing collars 50, 50'. In the locking position, the closing extensions 34, 34' rest with one side against an axial end face of one of the fixing collars 50, 50' and with one side against one of the stops 52, 52' of the fixing collars 50, 50'. The stops 52, 52' of the fixing collars 50, 50' are each formed by a projection on the respective fixing collar 50, 50' and are intended to interact directly with the locking projections 34, 34' to limit the rotational movement of the locking element 28. The stops 52, 52' of the fixing collars 50, 50' protrude axially from the respective fixing collar 50, 50'.Each of the fixing collars 50, 50' has exactly one stop 52, 52'. The stops 52, 52' of the fixing collars 50, 50' protrude from an axial end face of the respective fixing collar 50, 50'.

[0050] The rotational movement of the locking element 28 is limited by the stops 36, 36', 52, 52'. The closing extensions 34, 34' of the locking element 28 can each only be rotated to a limited extent between the open position and the locking position, wherein the positions each form end positions of the closing extensions 34, 34'. The angular range in which the locking element 28 can be rotated relative to the connecting plate 26 extends from the open position to the locking position. The open position and the locking position are each visible on the outside of the locking element 28 and the connecting plate 26. For this purpose, an arrow is shown on the locking element 28, which in the open position points to an open lock symbol on the connecting plate 26 and in the locking position points to a closed lock symbol on the connecting plate 26.

[0051] Furthermore, the connecting unit 20 has an operating lever 40 arranged on the locking element 28 for rotating the locking element 28. The operating lever 40 forms an actuating element. The operating lever 40 is provided for actuating the locking element 28 and is directly coupled to the locking element 28 for this purpose. The operating lever 40 is provided for manual actuation by a user. The operating lever 40 is formed by a rotary handle, such as in particular a rotary wing. The operating lever 40 is formed by a folding handle at least partially recessed into the locking element 28. The operating lever 40 is formed separately from the locking element 28.The operating lever 40 is pivotally mounted on the locking element 28. The operating lever 40 is rotatably mounted on the locking element 28 via a rotation axis perpendicular to the rotation axis 84 of the locking element 28. The operating lever 40 has an operating position (see Figure 6) and a stowage position on the locking element 28. The operating lever 40 can be pivoted back and forth between the operating position and the stowage position. The operating lever 40 is made of metal for reasons of robustness. The operating lever 40 can be folded out to rotate the locking element 28. Preferably, the operating lever 40 is spring-loaded in a way that is not visible from any further view, so that the operating lever 40 is held in the stowage position when not in use or moves into the stowage position. A spring causes the operating lever 40 to spring back into its flat original position after operation, so that it lies flat during operation and cannot hook into the workpiece.Alternatively or additionally, it would also be conceivable to provide a latching and / or locking mechanism which enables the operating lever 40 to be locked in the stowed position. The pivot point of the operating lever 40 is selected such that the centrifugal force supports the spring force during operation, thus preventing the operating lever 40 from springing open on its own during operation. In the operating position, a main extension plane of the operating lever 40 extends essentially parallel to the axis of rotation 84 of the locking element 28. In the stowed position, the operating lever 40 is folded against the locking element 28. In the stowed position, a main extension plane of the operating lever 40 extends essentially parallel to the axis of rotation 84 of the locking element 28. The operating lever 40 is arranged on a side of the locking element 28 facing away from the closing extensions 34, 34', in particular on the axial side.The operating lever 40 is arranged on a side of the locking element 28 facing the interface unit 16. The locking element 28 has a recess corresponding to the operating lever 40, into which the operating lever 40 is recessed in the stowed position.

[0052] The operating lever 40 has a gripping area 90 and an actuating area 92. The rotation axis of the operating lever 40 is arranged between the gripping area 90 and the actuating area 92. In the stowed position, an air space is arranged in the receiving area of ​​the locking element 28 below the actuating area 92. When pressure is applied to the actuating area 92, the actuating area 92 pivots further into the receiving area of ​​the locking element 28, so that the gripping area 90 pivots out of the receiving area of ​​the locking element 28 through the rotation axis. This allows the gripping area 90 to be grasped by an operator and brought into the operating position.

[0053] To change or install a grinding wheel 22, the closure part 32 is separated from the base support 14 in a first step. For this purpose, the operating lever 40 is folded upward into the operating position and the locking element 28 is rotated from the locked position into the open position by means of the operating lever 40. As a result, the closing extensions 34, 34' come out of engagement with the fixing collars 50, 50' of the connecting section 24. The closure part 32 can then be removed in the axial direction from the central recess of the base support 14. Subsequently, an existing grinding wheel 22 can optionally be removed in a further step. Subsequently, in a further step, a grinding wheel 22 is placed onto the support surface 80 of the base support 14.In this case, the rotary drive recesses 62 of the grinding wheel 22 must be aligned so that they overlap with the recesses 48, 48' of the connecting section 24 for receiving the rotary drive elements 30, 30'. Subsequently, in a further step, the closure part 32 can be reinserted into the base support 14. To do this, the operating lever 40 is folded upwards again into the operating position. Furthermore, the rotary drive elements 30, 30' of the connecting plate 26 are pushed through the rotary drive recesses 62 of the grinding wheel 22 into the recesses 48, 48' of the connecting section 24. Subsequently, the locking element 28 is rotated from the open position into the locked position by means of the operating lever 40. As a result, the closing extensions 34, 34' engage behind the fixing collars 50, 50' of the connecting section 24. The operating lever 40 can be brought back into the flat stowed position, orThe operating lever 40 automatically folds into this position due to spring preload. The grinding wheel 22 is then ready for use.

Claims

Claims 1 . A support plate device (10), in particular for mounting on a handheld power tool (12), in particular an angle grinder, comprising a base support (14), an interface unit (16) for connection to an output shaft (18) of the handheld power tool (12), in particular an angle grinder, and a connecting unit (20) for fastening a grinding wheel (22) to the base support (14), which has at least one connecting section (24) arranged on the base support (14) and a connecting plate (26) which is detachably connectable to the base support (14) and is intended to hold the grinding wheel (22) positively and / or non-positively on the base support (14), characterized in that the connecting unit (20) has at least one locking element (28) mounted on the connecting plate (26), which is intended to detachably fix the connecting plate (26) in the axial direction to the connecting section (24).wherein the connecting plate (26) has at least one rotary driving element (30, 30') for a rotationally fixed connection to the base support (14).

2. Support plate device according to claim 1, characterized in that the locking element (28) and the connecting plate (26) form a closure part (32), wherein the locking element (28) is captively connected to the connecting plate (26).

3. Support plate device according to claim 1 or 2, characterized in that the locking element (28) has at least one closing extension (34, 34') which, in a locking position of the locking element (28), is provided to at least partially engage behind the connecting section (24) of the connecting unit (20) arranged on the base support (14).

4. Support plate device according to claim 3, characterized in that the at least one closing extension (34, 34') of the locking element (28) is arranged overlapping with the rotary driving element (30, 30') in an open position of the locking element (28).

5. Support plate device according to one of the preceding claims, characterized in that the connecting plate (26) has at least one stop (36, 36') which is provided to limit a rotational movement of the locking element (28) in at least one direction, in particular an opening direction (38).

6. Support plate device at least according to claim 3 and 5, characterized in that the stop (36, 36') is formed by an extension on the rotary driving element (30, 30') and is provided to cooperate directly with the at least one closing extension (34, 34') to limit the rotary movement of the locking element (28).

7. Support plate device according to one of the preceding claims, characterized in that the connecting unit (20) has an operating lever (40) arranged on the locking element (28) for rotating the locking element (28).

8. Support plate device according to claim 7, characterized in that the operating lever (40) is pivotally mounted on the locking element (28), wherein the operating lever (40) has an operating position and a stowed position in which the operating lever (40) is folded onto the locking element (28).

9. Support plate device according to one of the preceding claims, characterized in that the connecting plate (26) has a conical fixing surface (42) for fixing the grinding wheel (22).

10. Support plate device according to claim 9, characterized in that the connecting plate (26) has on the fixing surface (42) form-fitting extensions (44) which are intended to engage in recesses (46) of the grinding wheel (22). 11 . Support plate device according to one of the preceding claims, characterized in that the connecting section (24) has at least one axial recess (48, 48') for receiving the rotary driving element (30, 30') and at least one radial fixing collar (50, 50') adjacent to the recess (48, 48'), which is intended to be engaged behind by a closing extension (34, 34') of the locking element (28) in a locking position.

12. Support plate device according to claim 11, characterized in that the fixing collar (50, 50') has at least one stop (52, 52') which is provided to limit a rotational movement of the locking element (28) in at least one direction, in particular a closing direction (54).

13. Support plate device according to one of the preceding claims, characterized in that the connecting section (24) is connected in one piece, in particular in one part, to the base support (14).

14. Hand tool system with a hand tool (12), in particular an angle grinder, and with a support plate device (10) according to one of the preceding claims.

15. Closure part of a support plate device (10) according to claim 2.

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