Patent Publication Number: US-10766130-B2

Title: System formed by at least one hand-held power tool, at least one first interface, and at least one electrotechnical product

Description:
This application is a 35 U.S.C. § 371 National Stage Application of PCT/EP2016/078660, filed on Nov. 24, 2016, which claims the benefit of priority to Serial No. 10 2015 223 144.5, filed on Nov. 24, 2015 in Germany, Serial No. 10 2015 224 365.6, filed on Dec. 4, 2015 in Germany, Serial No. 10 2016 208 106.3, filed on May 11, 2016 in Germany, and Serial No. 10 2016 209 253.7, filed on May 27, 2016 in Germany the disclosures of which are incorporated herein by reference in their entirety. 
     BACKGROUND 
     Electric hand-held power tools are known in principle, and are supplied with electric power via a mains power connection. Alternatively, battery appliances allow a high degree of flexibility in working since, in particular, they are non-dependent on mains electric power. Thus, for example, work can also be conveniently performed outside, such that in many cases the use of battery packs is provided for operation of a hand-held power tool. 
     Electrotechnical products, in particular non-motorized electrotechnical products such as, for example, a charging device for a battery pack of a hand-held power tool, a construction site radio, a measuring device or a construction site spotlight, are known in principle and are normally supplied with electric power via a mains power connection. Alternatively, battery appliances allow a high degree of flexibility in working since, in particular, they are non-dependent on mains electric power. Thus, for example, work can also be conveniently performed outside, such that in many cases the use of battery packs is provided for operation of electrotechnical products. An electric hand-held power tool in this case differs from an electrotechnical product that is used in the field of professional trades in that, in particular, unlike the hand-held power tool, the electrotechnical product does not have a motor, and is thus non-motorized. 
     Such battery packs are known in principle, and have rechargeable batteries, normally a plurality of battery cells that are connected in parallel and/or in series. Within this application, a battery pack is thus to be understood to mean a battery pack, preferably composed of a plurality of electrically interconnected battery cells, that can store electrical energy and supplies the energy required for the operation of a hand-held power tool. For example, three series-connected, cylindrical Li-ion cells, each of 3.6 V, for example, may be provided to give a total voltage of 10.8 V. 
     Known from the prior art are hand-held power tools that use a communication interface in the form of an infrared transmission means for transmitting, for example, data, parameters or the like. This infrared transmission means enables corresponding data to be exchanged between hand-held power tools and an external interface. It is found to be disadvantageous in this case that such infrared transmission means can be used only to a limited extent, since, on the one hand, there may be obstacles, located between the hand-held power tool and the external interface, that prevent transmission, or a movement by the user interrupts the corresponding connection, at least temporarily. In addition, such an infrared connection can only be used for limited ranges. In the case of fixedly integrated infrared transmission means, it is found to be disadvantageous that replacement of the infrared transmission means is often not possible, and/or the replacement process is elaborate and cost-intensive. 
     In general, products, from the field of professional trades, that have communication interfaces have the disadvantage that the communication interfaces are fixedly built-in, or integrated, as described, for example, in EP 2 680 093 A2. This disadvantage has the effect that each product has to have its own communication interface, which represents a high cost factor and, in the event of a defect of the communication interface, renders replacement either elaborate and cost-intensive or not even possible at all. 
     SUMMARY 
     The object of the disclosure is to provide a communication interface that can be used in a flexible manner in differing products from the field of professional trades. 
     Disclosed according to the disclosure is a system having at least one hand-held power tool, wherein the hand-held power tool has a housing, having a handle, and has a drive motor arranged in the housing, wherein the drive motor is coupled to a tool receiver. The tool receiver is intended to receive, or fasten in a rotationally fixed manner, an insert tool on the hand-held power tool. The insert tool in this case may be, for example, a drill bit for a power drill, a cutting disc for an angle grinder, or a saw blade for a circular saw. The system comprises at least one first interface, wherein the first interface is designed to receive information from at least one second, external interface and/or to send information to at least one second, external interface. The system furthermore comprises at least one electrotechnical product, in particular an electrotechnical product without a drive motor, having a housing. According to the disclosure it is provided that the housing of the hand-held power tool and the housing of the electrotechnical product each have a receiving opening, wherein the first interface can be removably arranged in the receiving openings. In addition, the receiving opening can be releasably sealed by a cover, wherein the cover closes the housing outwardly. In this way, the first interface can be releasably mounted on the hand-held power tool and the electrotechnical product, the receiving opening enabling the first interface, arranged in the housing of the hand-held power tool and of the electrotechnical product, to be replaced in a simple and inexpensive manner. Since the first interface can be mounted in all hand-held power tools and electrotechnical products according to the disclosure, a first interface advantageously suffices to expand all hand-held power tools and electrotechnical products with the functions of the first interface, since the first interface can be mounted as required in the hand-held power tool or electrotechnical product that is to be used. In other words, the first interface is realized so as to be exchangeable between the at least one hand-held power tool and the at least one electrotechnical product of the system. 
     Advantageously, the hand-held power tool or the electrotechnical product additionally has a control unit inside the housing. The control unit may on the one hand be in contact with the drive motor and/or with the transmission and/or with battery-pack electronics of a battery pack, or with measuring electronics of a measuring device, and on the other hand be in electronic and/or mechanical contact with the first interface, and receive and/or send information from the first interface. 
     The housing of the hand-held power tool and/or the housing of the electrotechnical product may comprise an interface housing that is realized so as to constitute a single piece with the respective housing. Advantageously, the interface housing realizes the receiving opening directly in the housing wall of the hand-held power tool and/or of the electrotechnical product, and the receiving opening may be realized in the shape of a cup or box, having a circumferential side wall and a base surface. In particular, it is advantageous in this case that a cup-shaped receiving opening has an almost circular opening that additionally stiffens the housing of the hand-held power tool and/or of the electrotechnical product, which housing is in principle weakened by the opening. The interface housing, in particular the base surface of the interface housing, additionally has at least one opening for the through passage of connection elements, for example at least one electrical lead in the direction of other electrical components such as, for example, the control electronics, measurement electronics, and/or the battery-pack electronics. Alternatively or additionally, it is conceivable for such an opening to be realized in the region of the side wall. Advantageously, an electrical connection can thereby be established between the first interface and the electrical components of the hand-held power tool and/or of the electrotechnical product. 
     Alternatively, the interface housing may be realized so as to constitute two pieces with the housing of the hand-held power tool and/or of the electrotechnical product, and an interface housing, for receiving the interface, may be arranged in the receiving opening. In a particularly preferred embodiment, the interface housing, with the first interface and the cover, realizes a self-contained module that can be releasably inserted inside the receiving opening. In this case, in particular, the cover and the interface housing may be of a single-piece design, alternatively also of a two-piece design, the module being inserted in the receiving opening of the hand-held power tool and/or of the electrotechnical product, and being releasably fastened, for example by a screwed connection between the receiving opening and the interface housing, or by other connection elements. In this way, the entire first interface is realized in a particularly compact manner, and can rapidly and easily be mounted, replaced and/or retrofitted in the hand-held power tool and/or in the electrotechnical product. A replacement and/or a repair can thus be effected in a rapid, simple and inexpensive manner. 
     The interface housing may be fastened in the housing of the hand-held power tool and/or of the electrotechnical product, or alternatively inserted in the receiving opening, and held in the receiving opening only by means of the cover. Preferably, the first interface is arranged in the receiving opening as far as possible without play, for example by means of a click connection, such that no rattling noises or the like can be produced, and also unintentional release of the first interface during operation is prevented. It is additionally advantageous if the receiving opening, or the interface housing, are realized in such a manner that the first interface can only be inserted in one way, such that incorrect fitting of the contact printed circuit board, or of the first interface, within the receiving opening of the hand-held power tool and/or of the electrotechnical product can be reliably prevented. 
     Advantageously, the cover is curved in such a manner that it follows the contour of the housing wall and closes in a flush manner with the latter. The cover may be made of various plastic materials such as, for example, polyamide 6, polyamide 66, PC (polycarbonate), ABS (acrylonitrile-butadiene-styrene copolymer), or of a material mix of differing plastics, and/or be reinforced with glass fiber. Preferably, the cover comprises the same material as the housing of the hand-held power tool and/or of the electrotechnical product. 
     To allow safe but easy access of the receiving opening and the first interface arranged therein, it is advantageous if the cover is releasably locked in a rotatory manner via a screw-type or bayonet closure. Another embodiment is a cover that is mounted such that it can pivot about a pivot axis, and that can be releasably locked in position on the housing, on the side of the cover that is opposite the pivot axis, by latching, screwed connection, clamping or holding. In this way, the possibility of the cover falling off the housing, or of the cover being lost, can be counteracted in an effective manner. The cover may additionally have a slot-type depression, enabling the cover to be easily opened by means of a coin or a screwdriver. The bayonet closure is easily actuated, but nevertheless ensures reliable closure of the receiving opening. Additionally or alternatively, the cover may also be fastened to the housing by means of at least one connection element, in particular by means of at least one screw. 
     Preferably, the first interface has a radio module; in particular, the first interface is composed of a radio module, the radio module receiving and/or sending a radio signal based on electromagnetic waves, for example a Bluetooth signal, in particular a Bluetooth low-energy signal, a WLAN signal or an NFC signal. The radio module in this case is an electrotechnical component that is used to establish a communication connection via a radio network in a great variety of fields. Thus, radio networks are already being used, for example, for applications in the so-called machine-to-machine (M2M) environment such as, for example, in the field of industrial automation, in motor vehicles, for assisting applications in the field of telematics, or also for remote polling of supply meters such as, for example, electricity, gas or water meters. Generally, the use of a radio module enables data transmission to be effected wirelessly via a radio network, thereby avoiding, in particular, resource requirements for otherwise necessary cabling. It thus becomes possible for data, parameters or the like to be reliably transmitted from and to an external, second interface by means of simple structural resources. As a preferred exemplary embodiment of such a radio module, for example a WLAN module may be used, for example an 868 MHz module or a 915 MHz module. Other types of radio module may likewise be used. The radio network in this case may be a communication network of any wireless communication standard such as, for example, WLAN (Wireless Local Area Network), Bluetooth, GSM (Global System for Mobile Communications), GPRS (General Packet Radio Service) or UMTS (Universal Mobile Telecommunications System). Moreover, particularly in the field of industrial automation, there is increasing use of wireless communication networks of comparatively short range that are specially adapted to the corresponding applications, also referred to as “Wireless Personal Area Networks (WPAN)”. Radio networks based on one of the standards IEEE 802.15.4 or WirelessHART may be cited as examples of these. 
     Advantageously, an active radio module emits a signal every eight seconds. Alternatively, and depending on the energy supply, the signal may also be emitted at shorter, or also longer, intervals. In particular in the case of energy being supplied by a second energy storage device that is assigned to the radio module, or to the first interface, the radio signal may be emitted, for example, every 10, 20 or 30 seconds, whereas, in the case of energy being supplied by the first energy storage device, assigned to the hand-held power tool or the electrotechnical product, the radio module emits a signal, for example, every four seconds, or even every second. The corresponding radio module of the transmission means may be connected, in particular serially, to the drive control, a measuring means for measuring various system variables, or the like. Such system variables are, for example, the motor rotational speed of the drive motor, a torque, a direction of rotation, etc. for the hand-held power tool, a loudness for the construction site radio, a charge state of the battery pack, a light intensity of a construction site spotlight, or a measurement variable of a measuring device. 
     To enable the first interface to be supplied with sufficient power in a simple manner, it is provided, according to a preferred development of the disclosure, that the radio module, in particular the first interface, is supplied with energy via the electric power supply of the hand-held power tool or of the electrotechnical product. This is achieved by releasably connecting the first interface to the first energy storage device. The first energy storage device in this case is to be understood to mean, in particular, the electric power supply and/or energy storage device of the hand-held power tool and/or of the electrotechnical product. The electric power supply in this case may be effected via a mains power cable. 
     Alternatively, it is conceivable for the radio module to have a second energy storage device, which is arranged inside the interface housing, the radio module being connected to the first energy storage device and/or to the second energy storage device. Advantageously, the first interface may be composed of the radio module and the second energy storage device. According to the disclosure, it is provided that, in the case of the electric power supply of the hand-held power tool and to the electrotechnical product being present and having sufficient energy, the radio module is supplied with energy via the electric power supply of the hand-held power tool and/or of the electrotechnical product; and in every other case it is supplied via the second energy storage device. In this way, an energy supply to the radio module can be ensured at all times. 
     It is additionally advantageous if the second energy storage device is connected to the radio module by means of plug-in or touch contacts, and if the first interface additionally has a resilient impingement means in the form of an elastic element, whereby reliable electrical contacting is ensured. It may in principle be provided that an elastic element, for example a spring element, is arranged between the cover and the second energy storage device, or between the base surface of the receiving opening and the second energy storage device, in order to press the second energy storage device against contact connections, provided inside the first interface, when the cover is closed. Advantageously, such a second energy storage device, for example a button battery, is replaceable. According to the disclosure, this can be achieved by opening the cover, such that, through the opening, a user can remove the second energy storage device from the receiving opening and replace it with a full or charged second energy storage device. When the cover has been closed again, the second energy storage device is held securely inside the receiving opening. In this way, replacement of the entire first interface, together with the radio module, is avoided, and long-term reliable operation of the first interface is ensured in a simple manner. 
     Alternatively, the second energy storage device may also be realized so as to be rechargeable, the second energy storage device being electrically connected, or able to be electrically connected, to the energy supply of the hand-held power tool and/or of the electrotechnical product in order ensure charging of the second energy storage device. If the hand-held power tool and/or the electrotechnical product has a second energy storage device in the form of a battery pack or mains-power connector plug, the second energy storage device of the first interface can be recharged by means of the energy provided by the mains electric power grid or the battery pack of the hand-held power tool and/or of the electrotechnical product. Advantageously in this case, provided inside the first interface there is a control unit that, depending on the energy supply of the hand-held power tool and/or of the electrotechnical product, charges the second energy storage device of the first interface and/or enables only the first interface to be supplied with energy, via the energy supply of the hand-held power tool and/or of the electrotechnical product, such that sustained operation of the first interface can be ensured in a simple manner. 
     It is additionally advantageous if the first interface has at least one contact printed circuit board, the contact printed circuit board in this case electrically connecting the radio module and the control unit of the hand-held power tool and/or of the electrotechnical product to each other, and enabling wired or wireless data exchange. The contact printed circuit board may additionally provide further space for accommodating additional electrical units such as, for example, the control unit mentioned above. With regard to this, the contact printed circuit board has at least one connection element, preferably two connection elements, for example plug-in connectors for plug-in contacts, at least one connecting element ensuring the data exchange and/or the energy supply with or by the control unit of the hand-held power tool and/or of the electrotechnical product, and/or a further connection element ensuring the data exchange and/or the energy supply from the contact printed circuit board to the radio module via a touch contact, for example a SIM card contact. 
     In an alternative embodiment, the first interface does not have its own contact printed circuit board, the radio module and/or the second energy storage device in this case being directly electrically connected, in a wireless or wired manner, to a contact element on a tool. In a further embodiment, it is also possible for the first interface to be arranged inside the receiving opening without contacting to the hand-held power tool and/or the electrotechnical product, such that the hand-held power tool and/or the electrotechnical product can at least be located by means of the radio module. 
     Preferably, the first interface furthermore has at least one damping element, in particular a viscoelastic element, which is advantageously realized in the form of a ring, for example as an O-ring or O-web, and which is elastically deformable. The damping element in this case may be realized so as to constitute a single piece with the interface housing, with the receiving opening, with the cover, and/or with the contact printed circuit board, or as a separate component. Preferably, the damping element is arranged between the cover and the contact printed circuit board, or radio module. Alternatively or additionally, the damping element may also be arranged between the contact printed circuit board, or radio module, and the base surface or the side wall of the receiving opening. It is thereby ensured that the first interface, inside the receiving opening and/or inside the interface housing, is securely protected against external influences. 
     Advantageously, the contact printed circuit board is fastened inside the receiving opening or inside the interface housing by means of latching, in which case the holding force may be provided by the damping element. Accordingly, the receiving opening and/or the interface housing may have a plurality of differing latching elements, by means of which the first interface, or a single component thereof, may be locked in position in the interface housing or inside the receiving opening, and fastened as far as possible without play. 
     It is additionally possible for alignment elements, for example ribs or webs, by means of which the first interface or the interface housing can be unambiguously arranged, or aligned, inside the receiving opening, to be arranged inside the receiving opening and/or on the first interface or on the interface housing. Incorrect mounting can thus be prevented in a simple manner. 
     The system according to the disclosure may also be provided in a tool system. Accordingly, a system, together with an external unit having a second interface that, in turn, is designed to receive information from the first interface and/or to send information to the first interface, is additionally provided by the disclosure. According to the disclosure, it may be provided that the external unit is a smartphone, an electronic data processing system. 
     By a simple design expedient, this system, in particular a tool system, enables data, parameters or the like to be reliably exchanged over greater distances between the electrotechnical product, the hand-held power tool and the external unit, thereby making it possible to facilitate monitoring of the operating modes and/or retrieval of the hand-held power tool and/or of the electrotechnical product. Moreover, a plurality of electrotechnical products can be grouped together by means of an electrotechnical product according to the disclosure or in a system according to the disclosure, and operated jointly by means of the external second interface and the respective radio module. It is particularly advantageous in this case that the electrotechnical products can communicate directly with each other by means of the external, second interface and/or via their radio modules. 
     A hand-held power tool is to be understood to mean, in general, all hand-held power tools having a tool receiver that can be put into motion, for example into rotation and/or oscillation, and that can be driven by a drive motor, such as, for example, a baton screwdriver, battery-powered drill, percussion drills, multifunction tools and/or drill/driver. Transmission of electrical energy in this context is to be understood to mean, in particular, that the hand-held power tool is supplied with energy via a battery and/or via a electric-power cable connection. 
     In principle, lithium-ion cells, in particular, may be used as battery cells for a battery pack, since, in the case of lithium-ion cells in particular, it is possible to combine a plurality of battery cells to form battery-cell blocks, in which a plurality of battery cells are connected in a parallel connection. 
     The electrotechnical product may also be realized as a measuring device, in particular a non-motorized measuring device such as that described, for example, in DE 10 2012 210 009 A1, in the form of a locating device. A measuring device may in general comprise at least one housing, in which the measuring unit is accommodated, and an indicating unit, for example in the form of a display. 
     The measuring unit in this case may have measuring electronics and measuring elements, which may be realized, for example, to detect objects enclosed in walls, to measure distances, to capture ambient parameters such as the temperature, the air humidity, the brightness, the air composition, etc., and to present these to the user via the indicating unit. 
     The electrotechnical product may be designed as a portable electrotechnical product, as a hand-held lighting appliance, in particular as a construction-site spotlight, as a construction-site radio, as a measuring device, or as a charging device for a battery pack of a hand-held power tool, and the type of the electrotechnical product and/or the component parts used therein, such as the type of battery pack, the type of lamp fitted, or the like, may be identified by means of the radio module, on the basis of an emitted code. 
     Further features, application possibilities, advantages and designs of the disclosure are given by the following description of the exemplary embodiments of the disclosure that are represented in the figures. The description, the associated figures and the claims contain numerous features in combination. Persons skilled in the art will also consider these features individually, in particular also the features of differing exemplary embodiments, and combine them to form appropriate further combinations. It is to be noted in this regard that the features represented are merely descriptive in character, and may also be used in combination with features of other further developments described above, and are not intended to limit the disclosure in any manner. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The disclosure is described in greater detail in the following on the basis of preferred exemplary embodiments. The drawings are schematic, and show: 
         FIG. 1  a side view of a hand-held power tool, with a first embodiment of a first interface inserted in the receiving opening; 
         FIG. 2  a perspective view of the hand-held power tool from  FIG. 1 , with an exploded view of the inserted first interface; 
         FIG. 3  a detail view of the first interface from  FIG. 2 ; 
         FIG. 4  a sectional view through the receiving opening along the axis y from  FIG. 1 , with a second embodiment of a first interface inserted in the receiving opening; 
         FIG. 5  a sectional view through a receiving opening along the line A-A from  FIG. 1 , with the first embodiment of a first interface inserted in the receiving opening; 
         FIG. 6  a sectional view through a receiving opening along the line A-A from  FIG. 1 , with a third embodiment of a first interface inserted in the receiving opening; 
         FIG. 7  a perspective view of a contact printed circuit board of a first interface; 
         FIG. 8  a perspective view of a system comprising a hand-held power tool, electrotechnical products and a first interface. 
     
    
    
     DETAILED DESCRIPTION 
       FIG. 1  shows an electrical appliance realized as a hand-held power tool  300 , which exemplarily is realized as a battery-powered drill/driver. Accordingly, in the embodiment represented, the hand-held power tool  300  is mechanically and electrically connected to a battery pack  100  for the purpose of supplying electric power independently of a mains electric power. It is pointed out, however, that the present disclosure is not limited to battery operated drill/drivers, but rather may be applied in differing hand-held power tools  300  that are operated with a battery pack  100 . The hand-held power tool  300  has a transmission  330 , which is arranged in a housing  305 , and which is not represented, for transmitting a torque generated by a drive motor  335 , likewise not represented, to a drive shaft that rotates about a rotation axis x and to which a tool receiver  320  is fastened, and a handle  315 . Inside the housing  305  the hand-held power tool  300  has a control unit  370  that is in electronic and/or mechanical contact with the drive motor  335  and the transmission  330 . The handle  315  serves as a support surface for a hand of an operator of the hand-held power tool  300 , and normally has a longitudinal axis y, a front side  317 , which extends along an axis x in the direction of the tool receiver  320 , a back side  316 , and two side faces  318 . The battery pack  100  represented in  FIG. 1  is realized as a slide-in battery pack. When the battery pack  100  is placed onto the hand-held power tool  300 , receiving means provided on the hand-held power tool  300 , e.g. guide grooves and guide ribs, are brought into engagement with corresponding guide elements  110  of the battery pack  100 , the battery pack  100  being inserted in a sliding direction along the receiving means of the handle  315 , and the battery pack  100  being pushed, along a lower outer surface of the handle  315  that is aligned substantially perpendicularly in relation to the longitudinal direction y of the handle  315 , into the battery-pack receiver of a hand-held power tool  300 . In the position shown in  FIG. 1 , the battery pack  100  is fastened to the handle  315  of the hand-held power tool  300 , and locked by locking means. The locking means comprise, inter alia, a locking element and an actuating element  220 . The battery pack  100  can be released from the handle  315  of the hand-held power tool  300  by actuation of the actuating element  220 . 
     The handle  315  additionally has a receiving opening  307  for receiving a first interface  380 . The first interface  380  is designed to receive information and to send this to a control unit  370  arranged inside the housing  305  and/or to a second, external, second interface, not represented. The receiving opening  307  is arranged in a region beneath an operating element  310  for switching the drive motor  335  on and off, or controlling the latter, on one of the two side faces  318 . In this way, the operation of the hand-held power tool  300  is not impeded by the arrangement of the receiving opening  307 . In the embodiment represented, the receiving opening  307  is realized in the shape of a cup. Alternatively, the receiving opening  307  may also have other embodiments, for example in the shape of a box. 
     The cup-shaped receiving opening  307  represented has a circumferential side wall  385  and a base surface  381 . This has the advantage, in particular, that the almost circular receiving opening  307  additionally stiffens the housing  305  of the hand-held power tool  300 , which housing is in principle weakened by the opening  307 . The receiving opening  307  can be closed by means of a cover  308 . The cover  308  is of a curved design, such that it follows a contour of the housing  305  and closes in a flush manner with the latter. Accordingly, the cover  308  may be made of various plastic materials such as, for example, PA6 (Gebamid B), PA6.6 (Gebamid A), PC (polycarbonate), ABS (acrylonitrile-butadiene-styrene copolymer), or of a material mix of differing plastics, and/or be reinforced with glass fiber, it being advantageous if the cover  308  comprises the same material as the housing  305  and the handle of the hand-held power tool  300 . 
     To allow safe but easy access to the receiving opening  307  and the first interface  380  arranged therein, the cover  308  has a slot-type depression  309 . Owing to the slot-type depression  309 , the cover  308  can be opened, for example, by means of a coin or a screwdriver. In the case of the embodiments shown in  FIGS. 2 and 3 , the cover  308  is releasably locked in a rotatory manner, in particular by means of a bayonet closure. As in  FIGS. 8 and 9 , the cover  308  may also be locked on the housing  305  by means of at least one connection element  306 , in particular by means of at least one screw. A further embodiment, not represented, is a hinged cover that is mounted so as to be pivotable about a pivot axis, and that can be releasably locked in position on the housing  305 , on the side opposite the pivot axis, by latching, screwed connection, clamping or holding. By means of such a cover  308 , the possibility of the cover falling off or being lost can be prevented. 
     Represented in  FIG. 2  is a perspective view of the hand-held power tool  300  from  FIG. 1 , and in particular a first interface  380  that is releasably inserted in the receiving opening  307  is represented in an exploded view. In the embodiment variant represented, the first interface  380  comprises substantially a damping element  388 , a second energy storage device  384 , a radio module  382 , a contact printed circuit board  386  and also, in the embodiment represented, the cover  308 . 
     As represented in  FIGS. 3 and 5 , the receiving opening  307  may realize an interface housing  389  as a single piece with the housing  305 . Alternatively, as represented in  FIGS. 4 and 6 , the interface housing  389  may be realized so as to constitute two pieces and, together with the cover  308 , may be releasably inserted, as a module, in the receiving opening  307  of the hand-held power tool  300 . The interface housing  389  may be fastened in the housing  305  of the hand-held power tool, or alternatively may also be inserted in the receiving opening  307  and held in the receiving opening  307  merely by means of the cover  308 . The first interface  380  is arranged as far as possible without play in the receiving opening  307 , for example by means of a click connection, such that rattling noises or the like can be avoided, and unintentional release of the first interface  380  can be prevented. 
     The interface housing  389  additionally has a base surface  381  having at least one opening  390  for the through passage of connection elements  387 , for example at least one electrical lead or a plug-in contact, in the direction of other electrical components such as, for example, the power electronics  370  and/or the battery-pack electronics  800 . In principle, alternatively or additionally, but not represented, such an opening  390  may also be realized in the region of the side wall  385 . 
     The first interface  380 , and in particular the radio module  382 , may be supplied with energy (not represented) by means of a releasable connection of the first interface  380  to the electric power supply and/or to the first energy storage device of the hand-held power tool  300 . Alternatively, and as represented in the figures, the first interface  380  has a second energy storage device  384  which, in the embodiment represented, is realized as a button battery and arranged, inside the interface housing  389 , directly on the radio module  382  and between the cover  308  and the radio module  382 , in its plain of main extent, parallel to the longitudinal axis y of the hand-held power tool  300 . 
     For the purpose of locking the second energy storage device  384  in position, the first interface  380  has at least one elastic element, the elastic element being able to be arranged, for example in the form of a spring element, between the cover  308  and the second energy storage device  384 , and/or between a base surface  381  of the interface housing  389  and the contact printed circuit board  386 , in order to press the second energy storage device  384  against the contact connections, provided inside the first interface  380 , when the cover  308  is closed, whereby reliable electrical contacting can be ensured. 
     The second energy storage device  384  is replaceable, this being made possible by opening the cover  308 . When the cover  308  has been closed, the second energy storage device  384  is held securely inside the receiving opening  307 . In this way, replacement of the entire first interface  380 , together with the radio module  382 , is avoided, and prolonged reliable operation of the first interface  380  is ensured in a simple manner. 
     Alternatively, the second energy storage device  384  may also be realized so as to be rechargeable, the second energy storage device  384  being electrically connected, or able to be electrically connected, to an energy source, for example to the battery pack  100  or to the mains power connection of the hand-held power tool  300 , in order to ensure charging of the second energy storage device  384 . Depending on the energy supply of the hand-held power tool  300 , the second energy storage device  384  of the first interface  380  is charged, and/or the supply of energy to the first interface  380  is enabled directly via the energy supply of the hand-held power tool  300 . In this way, sustained operation of the first interface  380  can be ensured in a simple manner. 
     In  FIG. 3 , the first interface  380  from  FIG. 2  is represented in detail, and from a different perspective. The radio module  382  is designed to receive and/or send a radio signal, for example a Bluetooth signal, a WLAN signal, an acoustic signal. Accordingly, the radio module  382  is contacted, via a wireless or wired connection, to the control unit  370 , the battery-pack electronics  800 , and/or various measuring means for measuring tool variables. Such tool variables are, or example, the motor rotational speed of the drive motor, a torque, a direction of rotation, etc. Advantageously, an active radio module  382  emits a signal every ten seconds. Alternatively, however, the signal may also be emitted at shorter intervals, for example every four seconds, or also longer intervals, for example every 20 or 30 seconds. 
     The contact printed circuit board  386  additionally has electrical units, connection elements  383  such as, for example, a SIM card contact and/or a plug-in connector  387 , in order to ensure the exchange of data with the radio module  382  and/or with the control unit  370  of the hand-held power tool  300  and/or the battery-pack electronics  80  of the battery pack  100 . In an alternative embodiment, not represented, the first interface  380  does not have its own contact printed circuit board  386 , the radio module  382  and/or the second energy storage device  384  in this case being directly electrically connected, in a wireless or wired manner, to a contact element on a tool. 
     The damping element  388  may be a viscoelastic element, which is advantageously realized in the form of a ring, for example as an O-ring or O-web, and which is elastically deformable. The damping element  388  in this case may be realized so as to constitute a single piece with the interface housing  389 , with the receiving opening  307 , with the cover  308 , and/or with the contact printed circuit board  386 , or as a separate component. In the embodiment variant represented in  FIGS. 2 to 5 , the damping element  388  is arranged between the cover  308  and the radio module  382 , or the second energy storage device  384 . As represented in  FIG. 6  and in detail in  FIG. 7 , the damping element  388  may additionally also be arranged between the contact printed circuit board  386  and a base surface  381  of the interface housing  389 . The damping element  388  ensures that the first interface  380 , inside the receiving opening  307  and/or inside the interface housing  389 , is securely protected against external influences. 
     Represented in  FIG. 5  is a sectional view through the receiving opening  307 , along the line A-A from  FIG. 1 , the interface housing  389  being realized as a single piece with the housing  305 . The receiving opening  307  is of a cup-shaped design, and comprises the side wall  385  and a base surface  381 . The first interface  380  from  FIG. 3  is inserted in the receiving opening  307 , the first interface  380  comprising the cover  308 , the damping element  388 , the second energy storage device  384 , and the radio module  382  and the contact printed circuit board  386 . In addition, one of the plug-in connectors  387  projects through the opening  390  in the base surface  381 , in order to establish a contact with a contact element, not represented, of the hand-held power tool  300 . The receiving opening  307  and the first interface  380  are covered by means of the releasable cover  308 . The cover  308  is curved in such a manner that it follows the contour of the housing wall and closes in a flush manner with the latter. In the embodiment variant represented in  FIG. 5 , the damping element  388  is arranged between the cover  308  and the second energy storage device  384 . 
     Unlike the second embodiment represented in  FIG. 5 , the third variant represented in  FIG. 6  has a sectional view through the receiving opening  307 , along the line A-A from  FIG. 1 , the interface housing  389  being realized so as to constitute two pieces and, together with the cover  308 , may be releasably inserted, as a module, in the cup-shaped receiving opening  307  of the hand-held power tool  300 . In the embodiment variant represented in  FIG. 6 , the damping element  388  is arranged between the base surface  381  and the contact printed circuit board  386 . 
     In  FIG. 7 , the contact printed circuit board  386  is represented, together with the damping element  388 , in a perspective view. The damping element  388  is designed as a single piece and in the form of a ring, and is attached directly on a first side of the contact printed circuit board  386 . A connection element  383  is arranged on a second side of the contact printed circuit board  386 . 
     Shown in  FIG. 8  is a system composed of a hand-held power tool  300 , a first interface  380  and an electrotechnical product  100  in the form of a hand-held lighting device  100   a , a charging device  100   b , a construction-site radio  100   c  and a measuring device  100   d . The hand-held power tool  300  and the electrotechnical products in this case each have a cover  308 , which covers a receiving opening  307  of the respective housing. The receiving opening  307  is intended to receive the first interface  380  which, according to the embodiment from  FIG. 3 , is exemplarily realized with a damping element  388 , a radio module  382 , a contact printed circuit board  386  and connection elements  387 . This embodiment in this case is described only exemplarily, and one of the alternative embodiment of the first interface  380 , already described in connection with the hand-held power tool  300 , is likewise conceivable. As a result of removal of the cover  308 , the receiving opening  307  of the hand-held power tool  300  or of one of the electrotechnical products  100   a ,  100   b ,  100   c ,  100   d  is exposed in such a manner that the first interface  380  can be arranged therein, and can be closed again by means of the cover  308 . Advantageously, the first interface  380  may be accommodated by an interface housing  389  that is realized substantially identically in the hand-held power tool  300  and the electrotechnical products  100   a ,  100   b ,  100   c ,  100   d . A single first interface  380  may advantageously be arranged in each hand-held power tool  300  or electrotechnical product  100   a ,  100   b ,  100   c ,  100   d  of the system. Substantially identical, in this context, is to be understood to mean that the first interface  380  can be accommodated in any hand-held power tool  300  of the system and in any electrotechnical product  100   a ,  100   b ,  100   c ,  100   d  in such a manner that at least one electrical connection can be established, in particular via electrical leads, between the first interface  380  of the hand-held power tool  300  and/or one of the electrotechnical products  100   a ,  100   b ,  100   c ,  100   d . The interface  380  is designed to receive information and to send this to a control unit  370  arranged inside the housing  305  and/or to a second, external interface, not represented. When the first interface  380  is in the inserted state in the receiving opening  307  of the hand-held power tool  300  or in the receiving opening  307  of one of the electrotechnical products  100   a ,  100   b ,  100   c ,  100   d , for example system variables, commands, data or parameters of the system can be transmitted, via the radio module  382  of the first interface  380 , to an external unit  900  having a second interface  980 , and/or received. Advantageously, the functional scope of the hand-held power tool  300  or the electrotechnical product  100   a ,  100   b ,  100   c ,  100   d  is thereby expanded. For example, it is conceivable that, when the first interface  380  is in the inserted state in the hand-held power tool  300  or in the electrotechnical product  100   a ,  100   b ,  100   c ,  100   d , the operating state of the hand-held power tool  300  or of the electrotechnical product  100   a ,  100   b ,  100   c ,  100   d  can be activated or deactivated via the second interface  980 . 
     Also represented is a tool case  100   e , composed of a housing having a main case body and a case lid, which enclose a tool receiving region. In its case lid, on the outer face, the tool case exemplarily has a receiving opening  307  that has a cover  308 , and can thus likewise be expanded with additional functions, which are provided by the first interface  380 . 
     In addition to the embodiments described and illustrated, further embodiments are conceivable, which may comprise further modifications and combinations of features.