Hand-held power tool and system

Abstract

The invention relates to a hand-held power tool (100) having a housing (110), having a drive unit (111) with a drive shaft (116), having a tool receptacle (150) driven by the drive unit (111) for receiving a plug-in tool (140), and having a receiving element (200) for receiving an additional handle (400), the housing (110) at least partially receiving the receiving element (200). According to the invention, the receiving element (200) has a transmission element (220) which is designed to transmit at least the forces occurring on the additional handle (400) into the housing (110).

Description

Technical Field

[0001] The invention relates to a handheld power tool and a system comprising the handheld power tool. Background Art

[0002] From the prior art, a handheld power tool is known which comprises a housing, a drive unit and an additional handle. Summary of the Invention

[0003] The present invention is based on a handheld power tool having a housing, a drive unit with a drive shaft, a tool receptacle driven by the drive unit for receiving an inserted tool, and a receiving element for receiving an auxiliary handle, wherein the housing at least partially receives the receiving element. It is proposed that the receiving element have a transmission element that is designed to transmit at least forces occurring on the auxiliary handle into the housing.

[0004] The present invention provides a robust handheld power tool in that the transmission element transmits at least the forces occurring on the auxiliary handle into the housing.

[0005] The handheld power tool can be configured as an electrically powered handheld power tool. Here, the electrically powered handheld power tool can be configured as an electrical mains-operated handheld power tool or as a battery-operated handheld power tool. For example, the handheld power tool can be configured as a screwdriver, a drill driver, a rotary impact driver, a hammer, a hammer drill, or an impact drill driver.

[0006] The housing of the handheld power tool is configured to at least partially accommodate the drive unit and the additional handle. The housing can be configured as a hood-type housing having two half-shells.

[0007] The tool receptacle can be designed as an internal tool receptacle, such as a bit receptacle, and / or as an external tool receptacle, such as a socket receptacle. It is also conceivable that the tool receptacle is designed as a drill chuck. The tool receptacle can receive an insert tool, such as a screwdriver bit or a socket wrench, so that a user can establish a screw connection between the fastening element and the fastening carrier.

[0008] A handheld power tool has a drive unit. The drive unit includes an electronically commutated drive motor and a transmission. The drive motor may, in particular, be configured as at least one electric motor. The transmission may be configured as at least one planetary gear transmission, which, for example, can be shifted. The planetary gear transmission may include at least one planetary carrier and planetary gears. Furthermore, the transmission, in particular the planetary gear transmission, may include at least one ring gear. In a shiftable transmission, at least two gears can be switched by means of at least one gear shifting element, in particular a gear shifting switch. The drive motor is configured so that it can be operated via a manual switch. When a user operates the manual switch, the drive motor is switched on and the handheld power tool begins operation. If the user no longer operates the manual switch, the drive motor is switched off. Preferably, the drive motor can be electronically controlled and / or regulated so that reverse operation and a predetermined desired rotational speed are possible. During reverse operation, the drive motor can be switched between clockwise and counterclockwise rotational directions. To enable the drive motor to switch during reverse operation, the handheld power tool may include a rotational direction switching element, in particular a rotational direction switching switch.

[0009] A handheld power tool may include a striking mechanism. During operation, the striking mechanism generates high torque peaks in order to loosen rigidly fixed connections or tighten them or drill holes. The striking mechanism may be connected to a drive motor via a transmission. The striking mechanism may be configured, for example, as a rotary striking mechanism, a latching striking mechanism, a rotating striking mechanism, or a hammer striking mechanism.

[0010] The drive motor has a drive shaft. The drive motor can drive a transmission, an impact mechanism, and / or a tool holder via the drive shaft. The handheld power tool can have a tool axis. Here, the rotational axis of the drive shaft can form the tool axis. "Axial" should be understood to mean essentially parallel to the tool axis, while "radial" should be understood to mean essentially perpendicular to the tool axis.

[0011] A handheld power tool may include a torque clutch. The torque clutch may be adjustable, wherein a user can adjust the desired torque using an adjustment ring. The torque clutch is designed so that it disengages when the desired torque is reached. The torque clutch may be arranged axially between the tool holder and the transmission. The handheld power tool may include a spindle locking device. The spindle locking device is configured to lock the tool holder when a torque is applied to the tool holder from the outside.

[0012] The handheld power tool also includes an energy supply device, wherein the energy supply device is configured for battery operation using a battery, particularly a handheld power tool battery pack, and / or for mains operation. In a preferred embodiment, the energy supply device is configured for battery operation. Within the scope of the present invention, a "handheld power tool battery pack" is to be understood as a combination of at least one battery cell and a battery pack housing. The handheld power tool battery pack is advantageously configured to supply energy to a commercially available battery-operated handheld power tool. For example, at least one battery cell may be a lithium-ion battery cell with a rated voltage of 3.6V. For example, the handheld power tool battery pack may include up to ten battery cells, although other numbers of battery cells are also contemplated. The embodiments of battery-operated handheld power tools and the operation of mains-operated handheld power tools are sufficiently well known to those skilled in the art that the details of the energy supply device will not be discussed here.

[0013] The handheld power tool includes a receiving element. The housing at least partially receives the receiving element. The receiving element can be arranged transversely to the drive shaft or the tool axis. The receiving element includes a transmission element. The receiving element can be connected to the transmission element in a form-locking, force-locking, and / or materially bonded manner. It is possible that the receiving element forms the transmission element, so that the receiving element and the transmission element are integral. It is possible that multiple transmission elements are provided, for example, two, three, four, or more. Furthermore, two transmission elements can be arranged opposite each other. The transmission element is configured to transmit at least an occurring force, in particular an operating force, and / or an occurring torque, in particular an operating torque, to the housing. The occurring force and / or torque can be generated, for example, by the user when the handheld power tool is pressed against a work surface, when the user pulls the handheld power tool from the work surface, or when the handheld power tool is subjected to a recoil or sudden impact in a counterclockwise or clockwise direction in a circumferential direction. The transmission element is designed to provide a larger contact surface, thereby transferring the majority of the torque that occurs into the housing and avoiding stress peaks when the additional handle is used. Furthermore, the receiving element is twisted when the additional handle is used. Furthermore, the receiving element with the transmission element is designed so that less installation space is required within the housing.

[0014] In one embodiment of the handheld power tool, the transmission element is arranged between the drive unit and the manual switch, in particular radially relative to the tool axis or relative to the drive shaft. This allows a compact design of the handheld power tool.

[0015] In one embodiment of the handheld power tool, the length of the transmission element is substantially the same as or greater than the opening diameter of the receiving element. The opening can be a through-opening of the receiving element. Here, the through-opening can be constructed as a cylinder, for example. The length of the transmission element can be a radial length or an axial length. The opening diameter can be the inner diameter of the thread of the receiving element. However, it is also conceivable that the opening or the through-opening has essentially no thread. The thread of the receiving element can be an M7 thread, wherein the thread pitch can be greater than 1 mm, for example 1.25 mm. It should be noted that the M8 thread is too large and results in a correspondingly bulky structure. The transmission element can be arranged around the opening of the receiving element in the circumferential direction. As a result, a larger contact surface can be achieved compared to a conventional hexagonal nut.

[0016] In one embodiment of the handheld power tool, the receiving element is essentially designed as a parallelepiped. The parallelepiped has six sides, two of which are parallel to each other. The parallelepiped can be designed, for example, in the shape of a cube or a cuboid. The transmission elements are each arranged on one of the side faces of the receiving element. The parallelepiped allows for a more compact design while providing a larger contact surface.

[0017] In one embodiment of the handheld power tool, the housing has at least one receptacle for a transmission element. The housing can form the receptacle so that the housing and the receptacle for the transmission element are integral. It is conceivable that the receptacle for the transmission element is connected to the housing in a form-locking, force-locking, and / or material-locking manner. For example, the receptacle for the transmission element can be configured as a parallelepiped, such as a cube or a cuboid. The receptacle for the transmission element can be configured, for example, as at least one housing rib, as at least one housing strip, or as at least one housing protrusion. The receptacle for the transmission element can receive the receiving element and / or the transmission element at least in a form-locking manner.

[0018] In one embodiment of the handheld power tool, the housing has at least one introduction element for an additional handle. The additional handle can have at least one screw-in thread. The introduction element can be configured to guide the screw-in thread in the direction of the receiving element opening. The housing can be connected to the introduction element in a form-locking, force-locking and / or material-locking manner. It is possible that the introduction element and the housing are integral. By way of example, the introduction element can be configured in the form of a ramp, a funnel, a protrusion or a slat. Here, two introduction elements arranged opposite each other are provided as an example. The introduction element can at least partially surround the receiving element.

[0019] In one embodiment of the hand-held power tool, the receiving element has at least one guide element, which is configured to guide the additional handle in the direction of the opening of the receiving element. The guide element can be connected to the receiving element in a form-locking, force-locking and / or material-locking manner. It is possible that the guide element and the receiving element are integral. The guide element can be configured to guide the screw-in thread of the additional handle in the direction of the opening of the receiving element. Two guide elements arranged opposite to each other are provided here as an example. The guide element can be configured, for example, in the form of a ramp, a funnel, a slat or a protrusion. The guide element and the introduction element can be arranged transversely relative to the drive shaft or relative to the tool axis. The introduction element can basically guide the screw-in thread of the additional handle to the guide element of the receiving element.

[0020] In one embodiment of the handheld power tool, the receiving element includes at least one additional transmission element arranged between at least two of the transmission elements. The additional transmission element can be connected to the receiving element in a form-locking, force-locking, and / or material-locking manner. It is possible that the additional transmission element and the receiving element are integral. By way of example, four additional transmission elements are provided. A further transmission element can be arranged between each two of the transmission elements. The further transmission element can have a radius, in particular a large radius of curvature. The further transmission element can be configured, for example, as a half-shell, a curved ramp, a rounded corner, or a slide.

[0021] In one embodiment of the handheld power tool, the housing has at least one receptacle for an additional transmission element. The housing can form the receptacle for the additional transmission element, so that the housing and the receptacle are integral. The receptacle for the additional transmission element is designed to be complementary to the additional transmission element. The receptacle for the additional transmission element can be designed, for example, as a half-shell, a curved ramp, or a slide.

[0022] A system is also provided, comprising the aforementioned handheld power tool and an additional handle. The additional handle is configured to connect to the handheld power tool via a receiving element. The additional handle comprises at least one gripping region and a connecting region. The gripping region is configured to be grasped by a user. The connecting region comprises a screw thread, by means of which the additional handle can be screwed into the receiving element. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The present invention is explained below based on a preferred embodiment. The following drawings show:

[0024] Figure 1 : A schematic view of a handheld power tool according to the present invention;

[0025] Figure 2 : A detail of a side view of a handheld power tool with a receiving element;

[0026] Figure 3 : A detail of a longitudinal section of a handheld power tool having a receiving element and a transmission element;

[0027] Figure 4 : A longitudinal section of a handheld power tool having a receiving element and a transmission element;

[0028] Figure 5 : a receiving element having a transmitting element;

[0029] Figure 6 : A system with a cutaway view of a handheld machine tool and an additional handle;

[0030] Figure 7 : Part of the connection area where the handle is attached. DETAILED DESCRIPTION

[0031] Figure 1 The handheld power tool 100 according to the present invention is shown, which is configured as an exemplary screwdriver 100. The handheld power tool 100 includes an output shaft 124 and a tool receptacle 150. The handheld power tool 100 has a housing 110 with a handle 126. To ensure a power supply independent of the power grid, the handheld power tool 100 is mechanically and electrically connected to a battery-operated energy supply, thereby configuring the handheld power tool 100 as a battery-operated handheld power tool 100. Here, a handheld power tool battery pack 130 serves as the energy supply. However, the present invention is not limited to battery-operated handheld power tools and can also be applied to power grid-dependent, i.e., mains-operated, handheld power tools.

[0032] Here, the housing 110 includes a drive unit 111. Drive unit 111 is arranged in the housing 110. Drive unit 111 includes an electronically commutated drive motor 114, which is supplied with power by a handheld power tool battery pack 130, and a transmission 118. Drive motor 114 is designed so that it can be operated, for example, via a manual switch 128, so that drive motor 114 can be switched on and off. Advantageously, drive motor 114 can be electronically controlled and / or regulated to enable reverse operation and a desired rotational speed. To enable reverse operation, the handheld power tool 100 includes a rotational direction switching element 121 configured as a rotational direction switching switch. Rotational direction switching element 121 is configured to switch drive motor 114 between a clockwise and counterclockwise rotational direction. The design and operation of suitable drive motors are sufficiently well known to those skilled in the art and will not be described in further detail here.

[0033] The transmission 118 and the drive motor 114 are connected via a drive shaft 116. The transmission 118 is provided for converting the rotation of the drive shaft 116 into a rotation between the transmission 118 and the tool receiving portion 150. The transmission 118 has a transmission housing 119 arranged in the housing 110. The transmission 118 is configured as a switchable transmission 118, which can be switched between at least two gears by means of at least one gear switching element 196, which can also be seen. Figure 2 Here, for example, the handheld power tool 100 includes a torque clutch 191 and a spindle locking device 193, which can also be seen Figure 2 and 4 The torque clutch 191 is configured to be adjustable by means of an adjustment ring 195, which can also be seen Figure 2 The handheld power tool 100 comprises a tool axis 102 , wherein the rotation axis of the drive shaft 116 here forms the tool axis 102 . The handheld power tool 100 comprises, by way of example, an impact mechanism 122 , which is designed here as a latching impact mechanism.

[0034] A tool receptacle 150 is provided on the output shaft 124. Preferably, the tool receptacle 150 is molded and / or formed on the output shaft 124. Preferably, the tool receptacle 150 is arranged along the axial direction 132 pointing away from the drive unit 111. The tool receptacle 150 is designed here as a hexagonal receptacle in the manner of a bit holder, which is provided for receiving an inserted tool 140. Figure 2 In the embodiment, the tool receptacle 150 is configured as a drill chuck. The insert tool is shaped like a driver bit with a polygonal outer coupling 142. Driver bit types, such as the HEX type, are well known to those skilled in the art. However, the present invention is not limited to the use of HEX driver bits; other tool receptacles deemed appropriate by those skilled in the art may also be used, such as HEX drill bits, SDS quick-insert tools, plug-in sockets, or round-shank drill chucks. Furthermore, the design and operation of suitable bit holders are well known to those skilled in the art.

[0035] The housing 110 includes an energy supply device holder 160. This energy supply device holder 160 receives the handheld power tool battery pack 130 and thereby forms a standing foot 162 having a standing surface. The handheld power tool battery pack 130 can be released from the energy supply device holder 160 without tools. In addition, the housing 110 has a handle 126 and the energy supply device holder 160. The handle 126 can be grasped by a user. In one embodiment, the energy supply device holder 160 is arranged on the handle 126. The handheld power tool 100 can be placed with the aid of the standing foot 162.

[0036] The handheld power tool 100 comprises a receiving element 200 for receiving an additional handle 400, which can also be seen. Figures 2 to 6 The housing 110 at least partially receives the receiving element 200. The receiving element 200 comprises a transmission element 220 which is configured to transmit at least the force occurring on the additional handle 400 to the housing 110. Figures 2 to 6 .

[0037] Figure 2 A detail 300 of a side view of a handheld power tool 100 with a receiving element 200 is shown. The receiving element 200 is arranged in the housing 110 substantially transversely relative to the drive shaft 116 or the tool axis 102. Furthermore, the receiving element 200 is arranged radially between the drive unit 111 and the manual switch 128, in particular relative to the tool axis 102 or the drive shaft 116. The housing 110 includes at least one insertion element 240 for an additional handle 400. The additional handle 400 includes a screw-in thread 406, which can also be seen. Figure 7 The introduction element 240 is formed to guide the screw thread 406 in the direction of the opening 202 of the receiving element 200. For example, the introduction element 240 and the housing 110 are integral. Here, the introduction element 240 is formed in the manner of a funnel. Two introduction elements 240 are formed on the housing 110 opposite to each other, which can also be seen. Figure 5 Furthermore, the introducing element 240 may at least partially surround the receiving element.

[0038] Figure 3 A detail 302 of a longitudinal section of a handheld power tool 100 is shown, showing a receiving element 200 and a transmission element 220. By way of example, the receiving element 200 and the transmission element 220 are integral. By way of example, a plurality of transmission elements 220 are provided, with four transmission elements 220 being formed in this embodiment. Two transmission elements 220 are arranged opposite one another. The transmission elements 220 are arranged radially, particularly relative to the tool axis 102 or the drive shaft 116, between the drive unit 111 and the manual switch 121. The length 222 of the transmission element 220 is substantially the same as or greater than the diameter 204 of the opening 202 of the receiving element 200. By way of example, the opening 202 is formed as a through-opening of the receiving element 200, wherein the through-opening is cylindrical. The length 222 of the transmission element 220 is represented by a radial length 223 and an axial length 224. The opening 202 is, for example, the inner diameter of the thread of the receiving element 200. For example, the thread of the receiving element 200 is an M7 thread, wherein the thread pitch is greater than 1 mm, for example 1.25 mm, for which it can also be seen that Figure 7. A plurality of transfer elements 220 are arranged in a circumferential direction around the opening 202 of the receiving element 220. The housing 110 includes at least one receiving portion 250 for the transfer element 220. Exemplarily, the housing 110 is formed with the receiving portion 250 so that the housing and the receiving portion are integrally formed. Exemplarily, the receiving portion 250 for the transfer element 220 is substantially formed as a parallelepiped, such as a cuboid. Furthermore, the receiving portion 250 for the transfer element 220 is formed as a housing rib. The receiving portion 250 for the transfer element 220 receives the receiving element 200 and the transfer element 220 in a materially bonded manner. The receiving element 200 includes at least one guide element 206. The guide element 206 is configured to guide the additional handle 400 in the direction toward the opening 202 of the receiving element 200, wherein the guide element 206 guides the screw-in thread 406 of the additional handle 400 in the direction of the opening 202 of the receiving element 200. Exemplarily, the guide element 206 and the receiving element 200 are integrally formed. Two guide elements 206 arranged opposite each other are formed, and it can also be seen that Figure 4 . The guide element 206 is shaped in the form of a funnel and is arranged transversely to the drive shaft 116 or to the tool axis 102. The receiving element 200 includes at least one further transfer element 230. The further transfer element 230 is arranged between at least two transfer elements 220. The further transfer element 230 and the receiving element 200 are integral. For example, four further transfer elements 230 are formed, which are each arranged between two transfer elements 220. The further transfer elements 230 include a radius and are shaped, for example, in the form of rounded corners. For this purpose, the housing 110 includes at least one receptacle 252 for the further transfer element 230. For example, the housing 110 and the receptacle 252 for the further transfer element 230 are integral. Here, the receptacle 252 for the further transfer element 230 and the further transfer element 230 are shaped complementary to each other. For example, the receptacle 252 for the further transfer element 230 is shaped as a half-shell.

[0039] Figure 4 A longitudinal section 304 of a handheld power tool 100 is shown, showing a receiving element 200 and a transmission element 220. The torque clutch 191 and the spindle locking device 193 are partially depicted here. The housing 110 has at least one support element 254, two of which are provided here. The support elements 254 are designed to lie opposite one another. The receiving element 200 is arranged between the two support elements 254. The support elements 254 are configured to support at least one connection region 404 of the auxiliary handle 400 in the connected state. By way of example, the support elements 254 are each shaped as a hollow cylinder.

[0040] Figure 5The figure shows a receiving element 200 having a transfer element 220. The receiving element 200 is essentially shaped as a parallelepiped. The receiving element 200 has six side faces, two of which are parallel to each other. Here, the parallelepiped is essentially shaped like a cuboid. Each transfer element 220 is formed on one of the side faces of the receiving element 200. An additional transfer element 230 is formed between each two transfer elements 220.

[0041] Figure 6 Detail 306 of a system 500 is depicted, which includes a handheld power tool 100 and an additional handle 400. The additional handle 400 is configured to be connected to the handheld power tool 100 via the receiving element 200. The additional handle 400 includes a gripping region 402 and a connecting region 404. The gripping region 402 is configured for gripping by a user. The connecting region 404 has a screw thread 406 and a supporting region 408, by means of which the additional handle 400 can be screwed into the receiving element 200. The supporting region 408 is configured to be supported on the supporting element 254 when connected to the handheld power tool 100.

[0042] Figure 7 A detail 408 of the connection region 404 of the additional handle 400 is shown. The thread of the receiving element 200 is formed as an M7 thread with a thread pitch of 1.25 mm. In comparison, a screw-in thread 450 of the prior art with an M7 thread and a thread pitch of 1 mm is shown. Due to the greater thread pitch of the screw-in thread 406, it can be designed to be shorter.

Claims

1. A handheld power tool (100) comprising a housing (110), a drive unit (111) with a drive shaft (116), a tool receptacle (150) driven by the drive unit (111) for receiving an insert tool (140), and a receiving element (200) for receiving an additional handle (400), wherein: The housing (110) at least partially receives the receiving element (200), characterized in that the receiving element (200) has a transmission element (220) which is designed to transmit at least forces occurring on the additional handle (400) into the housing (110).

2. The handheld power tool (100) according to claim 1, characterized in that The transmission element (220) is arranged between the drive unit (111) and the manual switch (128).

3. The handheld power tool (100) according to claim 1 or 2, characterized in that The length (222, 223, 224) of the transmitting element (220) is substantially the same as or greater than the diameter (204) of the opening (202) of the receiving element (200).

4. The handheld power tool (100) according to any one of claims 1 to 3, characterized in that The receiving element (200) is essentially designed as a parallelepiped.

5. The handheld power tool (100) according to claim 1, characterized in that The housing (110) has at least one receptacle (250) for the transfer element (220).

6. The handheld power tool (100) according to claim 1, characterized in that The housing (110) has at least one insertion element (240) for the additional handle (400).

7. The handheld power tool (100) according to claim 1, characterized in that The receiving element (200) has at least one guide element (242) which is designed to guide the additional handle (400) in the direction of the opening (202) of the receiving element (200).

8. The handheld power tool (100) according to claim 1, characterized in that The receiving element (200) has at least one further transmission element (230) which is arranged between at least two of the transmission elements (220).

9. The handheld power tool (100) according to claim 8, characterized in that The housing (110) has at least one receptacle (252) for the further transmission element (230).

10. A system (500) comprising a handheld power tool (100) according to any one of the preceding claims and an additional handle (400).

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