Work equipment attachment

Abstract

A tool attachment (200) for a hand-held power tool (100) is disclosed, comprising a housing (220), a deflection gear (230) that drives at least one output shaft (240), a connection interface (210) for connection to the hand-held power tool (100), and a tool receptacle (250) configured to receive at least one tool (202). It is proposed that the tool receptacle (250) includes a connecting sleeve (252) configured to detachably receive the tool (202).

Description

The present invention relates to a tool attachment according to the preamble of claim 1. State of the art US patent 3,597,883 already discloses a tool attachment comprising a housing, a deflection gear and a tool holder. Disclosure of the invention The present invention relates to a tool attachment for a hand-held power tool, comprising a housing, a deflection gear driving at least one output shaft, a connection interface for connecting to the hand-held power tool, and a tool receptacle designed to receive at least one tool. It is proposed that the tool receptacle include a connecting sleeve designed to detachably receive the tool. The invention provides a tool attachment that expands the range of applications for hand-held power tools. The attachment is connectable to the hand-held power tool. The attachment is designed for detachable connection to the power tool. The attachment comprises the housing, which may be a shell housing. The housing at least partially accommodates the deflection gear, the output shaft, and the connection interface. The reversing gear has a drive shaft that can be driven by a tool holder of the hand-held power tool when the tool attachment is connected to the power tool. The reversing gear can be a bevel gear in which the drive shaft and the output shaft are arranged transversely to each other. The reversing gear can drive the output shaft via the drive shaft. An axis of rotation of the tool or tool holder is transverse to an axis of rotation of the drive shaft or an axis of rotation of a drive unit of the hand-held power tool. The output shaft is designed to drive the tool holder. The connection interface is designed to form a mechanical connection with a connection interface of the hand-held power tool, so that the tool attachment can be mounted on and driven by the hand-held power tool.The connection interface of the tool attachment is designed to be complementary to the connection interface of the hand-held power tool. The tool holder is designed to accommodate and drive the tool. The tool can be, for example, a sanding roller, a brush, a flap disc sanding roller, a holder for a sandpaper roll, or the like. The tool attachment can have a splash guard, for example, in the form of a hood. The splash guard can be arranged between the tool holder and the connection interface of the tool attachment. The tool holder has a connecting sleeve designed to detachably hold the tool. The tool holder is connected to the output shaft. The tool holder can be driven by the output shaft. The tool holder is designed to drive the tool.The connecting sleeve is designed to accommodate the workpiece in the circumferential direction. The workpiece can rest against the connecting sleeve. The connecting sleeve can accommodate the workpiece on its outer circumference. The hand-held power tool can be electrically powered. This electrically powered power tool can be either mains-powered or battery-powered. For example, the hand-held power tool can be a screwdriver, a drill / driver, an impact drill / driver, an impact wrench, a rotary impact wrench, a hammer, or a rotary hammer. The hand-held power tool has a housing designed to at least partially accommodate the drive unit. The housing of the hand-held power tool can be designed as a shell housing with two half-shells. The hand-held power tool includes a drive unit. The drive unit comprises a drive motor and a gearbox. The drive motor can be an electrically commutated drive motor. In particular, the drive motor can be designed as at least one electric motor. The drive motor is designed such that it can be operated via a hand switch. When the hand switch is activated by a user, the drive motor is switched on and the hand-held power tool is put into operation. If the hand switch is no longer activated by the user, the drive motor is switched off. Preferably, the drive motor is electronically controllable and / or regulated in such a way that reversing operation and setting a desired rotational speed are possible. In reversing operation, the drive motor can be switched between clockwise and counterclockwise rotation.For switching the drive motor in reversing mode, the hand-held power tool may have a direction-of-rotation switching element, in particular a direction-of-rotation switch. The tool holder of the hand-held power tool may be designed as an internal holder, an external holder, a multi-sided internal holder, a multi-sided external holder, and / or a drill chuck. The tool holder is designed to accommodate insert tools, such as a screwdriver bit, a drill bit, an SDS drill bit, a socket, a drive socket, or the like. The connection interface of the hand-held power tool is located at the tool holder. The power tool also includes a power supply, which is designed for battery operation using rechargeable batteries, in particular power tool battery packs, and / or for mains operation. In a preferred embodiment, the power supply is designed for battery operation. Within the scope of the present invention, a "power tool battery pack" is understood to be an assembly of at least one battery cell and a battery pack housing. The power tool battery pack is advantageously designed to supply power to commercially available battery-operated power tools. The at least one battery cell can, for example, be a lithium-ion battery cell with a nominal voltage of 3.6 V. By way of example, the power tool battery pack can comprise up to ten battery cells, although a different number of battery cells is also conceivable.Both the battery-powered version and the mains-powered version are sufficiently known to those skilled in the art, which is why the details of the power supply will not be discussed here. The housing of the handheld power tool includes at least one power supply mounting device, in particular a power tool battery pack mounting device, on which the user interface is arranged. The power supply mounting device is specifically designed to hold, and in particular accommodate, the power supply, especially the power tool battery pack. Additionally, the power supply mounting device is designed to connect the power supply, in particular the power tool battery pack, to the housing in a tool-free manner and to ensure the power supply to the handheld power tool. The power supply mounting device, together with a connected power tool battery pack, forms at least one base with at least one standing surface. In particular, the handheld power tool can be supported, and in particular placed, on a standing surface by means of the base.The housing also includes a handle. The handle is designed to be gripped by the user to operate the handheld power tool. The power supply holding device is located specifically on the handle. The hand-held power tool has a control unit, at least for controlling the drive unit. The control unit is located within the housing, for example, in a handle of the power tool or in an area of ​​a power supply interface. The control unit can receive switching signals generated by a hand switch. The control unit may include at least one microprocessor or microcontroller. In one embodiment of the tool attachment, the connecting sleeve has at least one connecting hook designed to at least partially fix the tool. The connecting sleeve and the connecting hook can be connected to each other. The connecting sleeve can also form the connecting hook, and it is also possible for them to be integral parts. The connecting hook can be designed as a snap hook. For example, two connecting hooks can also be provided. It is possible for the two connecting hooks to be arranged opposite each other on the connecting sleeve. The connecting hook can bear against the tool, in particular against a body of the tool. The connecting hook can bear against the tool, in particular the body of the tool, in such a way that the tool can be fixed axially to the axis of rotation of the output shaft of the tool attachment. In one embodiment of the working tool attachment, the connecting sleeve has at least one drive element designed to drive the working tool. The connecting sleeve and the drive element are connected to each other. The connecting sleeve can also form the drive element itself, and these elements can, for example, be integral parts. The drive element can be designed, for example, as a drive rib, a drive pin, a drive bolt, or a drive projection. The drive element can be designed to engage with the working tool, in particular with the body of the working tool. Two drive elements can be provided. The two drive elements can, for example, be arranged opposite each other on the connecting sleeve. The working tool has a receptacle for the drive element into which the drive element can engage.It is also possible that the work equipment has the receptacle for the drive element and that the work equipment includes a drive element. In one embodiment of the work attachment, the drive element is arranged between the deflection gear and the connecting hook. The drive element can be arranged or configured axially to the axis of rotation of the output shaft between the deflection gear and the connecting hook. It is possible that the tool attachment has a further tool receptacle. In this case, the deflection gear, particularly axially, may be arranged between the tool receptacle and the further tool receptacle. The further tool receptacle is designed analogously to the tool receptacle. In one embodiment of the tool attachment, the tool attachment has an ejection mechanism designed to eject the tool. The ejection mechanism can be designed such that the tool can be detached from the connecting sleeve when the ejection mechanism is actuated. The ejection mechanism can be arranged at least partially within the housing. The ejection mechanism can be arranged at least partially axially to the drive shaft of the tool attachment between the deflection gear and the connection interface of the tool attachment. In one embodiment of the tool attachment, the ejection mechanism has at least one actuating element designed to actuate the ejection mechanism. This actuating element is intended to be operated by a user to release the tool from the tool receptacle, in particular the connecting sleeve. The actuating element can be designed, for example, as a button, a switch, or a slider. In one embodiment of the tool attachment, the ejection mechanism comprises at least one ejection element designed to at least partially bear against the tool. The ejection element can bear at least partial contact with the tool in such a way that it can detach, push, and / or move the tool from the tool receptacle when the ejection mechanism is actuated. The ejection element can, for example, be designed as an ejection bar, an ejection pin, an ejection plate, an ejection rod, or an ejection lever. In one embodiment of the tool attachment, the ejection mechanism has at least one transmission element configured to transmit the actuation of the actuating element to the ejection element. The transmission element can mechanically connect the actuating element to the ejection element, thus enabling the transmission of the ejection mechanism's actuation. The transmission element can, for example, be configured as a transmission lever. The transmission element can be positioned between the actuating element and the ejection element. In one embodiment of the tool attachment, the ejection mechanism has at least one deflecting element designed to redirect the transmission element. The deflecting element can, for example, be ring-shaped. The transmission element and the deflecting element can connect the actuating element and the ejection element. The housing can have a deflecting receptacle. The deflecting receptacle can engage with the deflecting element. The deflecting receptacle can pivotally mount the deflecting element. The deflecting receptacle can, for example, be designed like a pin, a bolt, or a stud. In one embodiment, the ejection mechanism has a return element designed to return the ejection mechanism from an actuated state to an unactuated state. The return element can, for example, be a spring element such as a coil spring or a leaf spring. The return element can be located near the actuating element. The return element can be arranged radially to the drive shaft of the working tool attachment, between the drive shaft and the actuating element. The return element can actuate the actuating element. In one embodiment, the ejection mechanism has a stop element designed to abut the housing and / or the drive shaft in both the actuated and unactuated states. The stop element can be arranged, particularly radially, between the housing and the drive shaft. The stop element can rest against the actuating element. The actuating element, the ejection element, the deflection element, the transmission element and the stop element can be formed in one piece. The invention also relates to a system comprising the hand-held power tool described above and the work attachment described above. Brief description of the drawings The invention is explained below with reference to preferred embodiments. The following drawings show: Fig. 1 a schematic view of a hand-held power tool; Fig. 2 a tool attachment according to the invention; Fig. 3 a section of the tool attachment; Fig. 4 a system with the tool attachment connected to the hand-held power tool; Fig. 5a a section of a longitudinal section of the tool attachment in an unactuated state of an ejection mechanism; Fig. 5b an enlarged section of the longitudinal section of the tool attachment in an actuated state of the ejection mechanism; Description of the exemplary implementations Fig. 1 shows a hand-held power tool 100, designed as an exemplary cordless screwdriver 100. The hand-held power tool 100 comprises an output shaft 124, a tool holder 150, and a connection interface 190 for attachments. The hand-held power tool 100 has a housing 110 with a handle 126. The hand-held power tool 100 can be mechanically and electrically connected to a power supply for battery operation, thus enabling the hand-held power tool 100 to be configured as a cordless power tool 100. A hand-held power tool battery pack 130 serves as the power supply in this case. However, the present invention is not limited to cordless power tools but can also be applied to mains-powered, i.e., mains-operated, hand-held power tools. The housing 110 includes a drive unit 111. The drive unit 111 is arranged within the housing 110. The drive unit 111 comprises an electrically commutated drive motor 114, which is powered by the power tool battery pack 130, and a gearbox 118. The gearbox 118 is designed as at least a planetary gearbox. The drive motor 114 is designed such that it can be operated, for example, via a hand switch 128, allowing the drive motor 114 to be switched on and off. Advantageously, the drive motor 114 is electronically controllable and / or adjustable, enabling reversing operation and a desired rotational speed. For reversing operation, the power tool 100 has a direction-of-rotation switching element 121, which is designed as a direction-of-rotation switch.The direction-of-rotation switching element 121 is designed to switch the drive motor 114 between a clockwise and a counterclockwise direction of rotation. The design and operation of a suitable drive motor are well known to those skilled in the art, and therefore will not be discussed in detail here. The gearbox 118 is connected to the drive motor 114 via a drive shaft 116. The gearbox 118 is designed to convert a rotation of the drive shaft 116 into a rotation between the gearbox 118 and the tool holder 150. The gearbox 118 comprises a gearbox housing 119. The hand-held power tool has an intermediate shaft 120, which is driven by the gearbox 118 and connected to a torque coupling 122. The intermediate shaft 120 and the torque coupling 122 are connected to the output shaft 124. The hand-held power tool 100 comprises a tool axis 102, wherein a rotational axis of the drive unit 111 forms the tool axis 102. The tool holder 150 is provided on the output shaft 124. Preferably, the tool holder 150 is integrally formed and / or formed on the output shaft 124. Preferably, the tool holder 150 is arranged in an axial direction 132 pointing away from the drive unit 111. The tool holder 150 is designed to receive and drive an insert tool 140. The connection interface 190 is designed to establish a mechanical connection with the attachments. The hand-held power tool 100 has a control unit 170 for controlling at least the drive unit 111, in particular the drive motor 114. The housing 110 at least partially accommodates the control unit 170. The control unit 170 includes a microprocessor (not shown in detail). The control unit 170 receives at least switching signals generated by the hand switch 128. Furthermore, the control unit is configured to receive, process, and output user interface signals from a user interface 200. Furthermore, the housing 110 includes a power supply holding device 160. The power supply holding device 160 accommodates the hand-held power tool battery pack 130 and forms a base 162 with a standing surface. The hand-held power tool battery pack 130 can be detached from the power supply holding device 160 without tools. The housing 110 also includes the handle 126 and the power supply holding device 160. The handle 126 can be gripped by the user. In one embodiment, the power supply holding device 160 is arranged on the handle 126. The hand-held power tool 100 can be set down using the base 162. Fig. 2 shows a tool attachment 200 according to the invention. The tool attachment 200 is designed for connection to the hand-held power tool 100. For this purpose, the tool attachment 200 includes a connection interface 210, which corresponds to the connection interface 190 of the hand-held power tool 100. The tool attachment 200 further comprises a housing 220, a deflection gear 230, an output shaft 240, and a tool receptacle 250, see also Fig. 3. The deflection gear 230 is designed to drive at least the output shaft 240. The tool receptacle 250 is designed to receive at least one tool 202, see also Fig. 3. The tool receptacle 250 includes a connecting sleeve 252. The connecting sleeve 252 is designed to detachably receive the tool 202.The housing 220 of the tool attachment 200 is a shell-shaped housing, the housing 220 at least partially accommodating the reversing gear 230, the output shaft 240, and the connection interface 210. The reversing gear 230 comprises a drive shaft 232, see also Fig. 5. The drive shaft 232 of the reversing gear 230 can be driven by the tool holder 150 of the hand-held power tool 100 when the tool attachment 200 is connected to the hand-held power tool 100. By way of example, the reversing gear 230 is designed as a bevel gear, see also Fig. 5. In the bevel gear, the drive shaft 232 and the output shaft 240 are arranged transversely to each other, with the reversing gear 230 driving the output shaft 240 by means of the drive shaft 232. Thus, a rotation axis of the work tool 202 or the work tool holder 250 is transverse to a rotation axis of the drive shaft 232 or the rotation axis of the drive unit 111 of the hand-held machine tool 100.The tool attachment 200 includes a splash guard 204, which is exemplarily shaped as a hood. The splash guard 204 is arranged between the tool receptacle 250 and the connection interface 210 of the tool attachment 200. The connecting sleeve 252 is designed to receive the tool 202 circumferentially, see also Fig. 3. The tool 202 rests against the connecting sleeve 252, which receives the tool 202 at its outer circumference. The connecting sleeve 252 includes at least one connecting hook 254. The connecting hook 254 is designed to at least partially fix the tool 202, see also Fig. 3, Fig. 4 to Fig. 5. The connecting sleeve 252 and the connecting hook 254 are connected to each other, with the connecting sleeve 252 forming the connecting hook in this example, so that they are a single piece. The connecting hook 254 is shaped like a snap hook.Two connecting hooks are shown as an example, arranged opposite each other on the connecting sleeve 252. In a connected state, the connecting hook 252 rests against the working device 202, in particular against a body 203 of the working device 202. The connecting hook 254 fixes the working device 202 axially to the axis of rotation of the output shaft 240 of the working device attachment 200. The connecting sleeve 252 comprises at least one drive element 256, see also Fig. 3 and Fig. 5. The drive element 256 is designed to drive the working device 202. The connecting sleeve 252 and the drive element 256 are connected to each other, with the connecting sleeve 252 forming the drive element 256 so that they are a single piece. The drive element 256 is designed as a drive web by way of example. The drive element 256 is designed to engage with the working equipment 202, in particular with the body 203 of the working equipment 202.Two drive elements 256 are shown as examples, wherein the two drive elements 256 are formed opposite each other on the connecting sleeve 252. The working device 202 includes a receptacle 205 for the drive element 256. The receptacle 205 for the drive element 256 is designed such that the drive element 256 engages in the receptacle 205. The drive element 256 is arranged, in particular axially to the axis of rotation of the output shaft 240, between the deflection gear 230 and the connecting hook 254. In the embodiment shown in Figures 2 and 3, the working tool attachment 200 comprises a further working tool receptacle 251. The deflection gear 230 is arranged here, particularly axially, between the working tool receptacle 250 and the further working tool receptacle 251. The further working tool receptacle 251 also comprises the output shaft 240, a further connecting sleeve 253, two connecting hooks 254, and two drive elements 256. Figure 3 shows a section 300 of the working tool attachment 200. Fig. 4 shows a system 400 with the tool attachment 200 connected to the hand-held power tool 100. Fig. 5a shows a section 302 of a longitudinal section of the tool attachment 200 in the unactuated state of an ejection mechanism 260. Fig. 5b shows an enlarged section 304 of the longitudinal section of the tool attachment 200 in the actuated state of the ejection mechanism 260. The tool attachment 200 includes the ejection mechanism 260. The ejection mechanism is designed to eject the tool 202. The ejection mechanism 260 is designed such that the tool 202 can be detached from the connecting sleeve 252 when the ejection mechanism 260 is actuated.The ejection mechanism 260 is at least partially arranged in the housing 220, wherein the ejection mechanism 260 is arranged at least partially axially to the drive shaft 232 of the working tool attachment 200 between the deflection gear 230 and the connection interface 210 of the working tool attachment 200. The ejection mechanism 260 comprises at least one actuating element 262. The actuating element 262 is designed to actuate the ejection mechanism 260. The actuating element 262 is, by way of example, shaped like a button. Furthermore, the ejection mechanism 260 comprises at least one ejection element 264. The ejection element 264 is designed to bear at least partially against the working tool 202. The ejection element 264 is at least partially in contact with the working equipment 202 in such a way that it releases the working equipment 202 from the working equipment receptacle 250 when the ejection mechanism 260 is actuated.The ejection element 264 is exemplified as an ejection ledge, which here is L-shaped. The ejection mechanism 260 comprises at least one transmission element 266. The transmission element 266 is designed to transmit an actuation of the actuating element 262 to the ejection element 264. The transmission element 266 connects the actuating element 262 to the ejection element 264. The transmission element 266 is exemplified as a transmission lever. Furthermore, the transmission element 266 is arranged between the actuating element 262 and the ejection element 264. The ejection mechanism 260 comprises at least one deflection element 268. The deflection element 268 is designed to deflect the transmission element 266. The deflection element 268 is exemplified as being ring-shaped. The transmission element 266 and the deflection element 268 connect the actuating element 262 and the ejection element 264. The housing 220 includes a deflection receptacle 222.The deflection receptacle 222 engages with the deflection element 268, and the deflection receptacle 222 is designed such that it pivotably supports the deflection element 268. Here, the deflection receptacle 222 is shaped, by way of example, like a pin. The ejection mechanism 260 includes a return element 270. The return element 270 is designed to return the ejection mechanism 260 from the actuated state to the unactuated state. By way of example, the return element 270 is shaped as a spring element, such as a coil spring. The return element 270 is arranged at the actuating element 262, with the return element 270 being arranged radially to the drive shaft 232 of the working tool attachment 200 between the drive shaft 232 and the actuating element 262. The return element 270 actuates the actuating element 262. The ejection mechanism 260 further comprises a stop element 272.The stop element 272 is designed to abut the housing 220 and / or the drive shaft 232 in both the actuated and / or unactuated states. The stop element 272 is arranged, particularly radially, between the housing 220 and the drive shaft 232. The stop element 272 rests against the actuating element 262, and is connected to it. By way of example, the stop element 272 is designed as a stop tongue. The actuating element 262, the ejection element 264, the deflection element 268, the transmission element 266, and the stop element 272 are formed in one piece. QUOTES INCLUDED IN THE DESCRIPTION This list of documents cited by the applicant was automatically generated and is included solely for the reader's convenience. The list is not part of the German patent or utility model application. The DPMA accepts no liability for any errors or omissions. Cited patent literature US 3,597,883

[0002]

Claims

Tool attachment (200) for a hand-held power tool (100) with a housing (220), with a deflection gear (230) which drives at least one output shaft (240), with a connection interface (210) for connection to the hand-held power tool (100) and with a tool receptacle (250) which is designed to receive at least one tool (202), characterized in that the tool receptacle (250) has a connecting sleeve (252) which is designed to receive the tool (202) detachably. Working device attachment (200) according to claim 1, characterized in that the connecting sleeve (252) has at least one connecting hook (254) which is designed to at least partially fix the working device (202). Working device attachment (200) according to claim 1 or 2, characterized in that the connecting sleeve (252) has at least one drive element (256) which is designed to drive the working device (202). Working tool attachment (200) according to claims 2 and 3, characterized in that the drive element (256) is arranged between the deflection gear (230) and the connecting hook (254). Working tool attachment (200) according to one of the preceding claims, characterized by an ejection mechanism (260) which is designed to eject the working tool (202). Working tool attachment (200) according to claim 5, characterized in that the ejection mechanism (260) has at least one actuating element (262) which is designed to actuate the ejection mechanism (260). Working tool attachment (200) according to claim 5 or 6, characterized in that the ejection mechanism (260) has at least one ejection element (264) which is designed to at least partially bear against the working tool (202). Working tool attachment (200) according to at least one of claims 5 to 7, characterized in that the ejection mechanism (260) has at least one transmission element (266) which is designed to transmit an actuation of the actuating element (262) to the ejection element (264). Working tool attachment (200) according to at least one of claims 5 to 8, characterized in that the ejection mechanism (260) has at least one deflecting element (268) which is designed to deflect the transmission element (266). System (400) comprising a hand-held power tool (100) and a tool attachment (200) according to one of the preceding claims.

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