Hand-held power tool

Abstract

The invention relates to a hand-held power tool having a housing in which a drive unit and a percussion mechanism unit are arranged, a tool receptacle interface which is configured for releasable connection of the hand-held power tool to a tool receptacle, wherein the tool receptacle is configured as a mixing bowl receptacle. It is proposed that the hand-held power tool has a user interface via which at least one hammer drill mode and a mixing mode can be set.

Description

Technical Field

[0001] This invention relates to a handheld machine tool, particularly a hammer drill. Background Technology

[0002] A hammer drill with a replaceable tool holder is described in DE 103 21 869 A1. Summary of the Invention

[0003] This invention relates to a handheld power tool, comprising: a housing in which a drive unit and an impact mechanism unit are arranged; and a tool receiving interface configured for releasably connecting the handheld power tool to the tool receiving section, wherein the tool receiving section is configured as a stirring basket-shaped receiving section. The invention proposes that the handheld power tool has a user interface through which at least one hammer drilling mode and a stirring mode can be set. Advantageously, the handheld power tool can thus be optimally matched to its intended use. The handheld power tool can be configured as a plug-in handheld power tool or as a battery-powered handheld power tool capable of being connected to a battery pack for power supply.

[0004] In this context, handheld machine tools should be understood in particular as implements used for machining workpieces with electrically driven insert tools. Typical handheld machine tools in this context include handheld or vertical drills, screwdrivers, impact drills, hammer drills, or similar machine tools.

[0005] The tool receiver is particularly configured for releasably securing insert-type tools. Tool receivers releasably connected via a tool receiver interface are particularly configured such that users can change the tool receiver without tools or with the aid of tools. Different tool receivers are known to those skilled in the art. For example, tool receivers in the form of quick-clamping drill chucks for hammer drills or SDS-plus hammer chucks are known. The tool receiver interface has force-locking and / or form-locking elements that can be releasably connected to corresponding force-locking and / or form-locking elements of the tool receiver.

[0006] The housing of a handheld power tool is at least partially, and especially entirely, constructed as an outer shell. The housing can be constructed as a single piece or in multiple pieces. The housing is at least partially, and especially entirely, made of plastic. Furthermore, the housing of a handheld power tool may have an inner shell, which is at least partially, preferably entirely, surrounded by the outer shell.

[0007] Handheld power tools preferably have a drive unit with an electric motor. The electric motor can be configured as a DC motor or an AC motor. Commutation of the motor can be electronic or via carbon brushes. The electric motor is rotatably supported in the housing of the handheld power tool about its motor axis. The drive motion of the drive unit, or electric motor, can be transmitted to the tool receiver or insert tool via a transmission unit. The impact mechanism unit can be configured, for example, as a pneumatic impact mechanism or an intermittent impact mechanism. The pneumatic impact mechanism can be configured, for example, as an eccentric impact mechanism or an oscillating impact mechanism. The impact mechanism particularly has a guide tube in which the impactor and / or piston are received linearly. The piston is preferably configured to be driven linearly oscillatingly by the eccentric impact mechanism or the oscillating impact mechanism. The transmission unit is particularly configured such that the insert tool connected to the tool receiver can be driven rotatably about its working axis and / or linearly oscillatingly or impactfully along its working axis.

[0008] User interfaces can be constructed directly or indirectly. A direct user interface should be understood as one where the user directly inputs settings. This could be achieved by setting a mixing mode using a single parameter, such as the speed of the motor or tool receiver or the mixing time, or by combining multiple parameters, such as the speed of the motor or tool receiver and the mixing time.

[0009] An indirect user interface should be understood as one that senses the user's operation or the state of the handheld tool and automatically sets the handheld tool based on the requested operation or state. The handheld tool may have one or more sensors that can sense the user's operation or the handheld tool's state. For example, the handheld tool may have a camera-like sensor that can sense the tool receiver or a plug-in tool connected to the tool receiver. It is also conceivable that the sensor can sense or scan an identification unit or barcode, through which a single parameter or multiple parameters can be set in combination. The indirect user interface can be configured such that the handheld tool can be set fully automatically or semi-automatically. Semi-automatic setting, in this context, should be understood as a setting where the setting is displayed to the user and the user can confirm or change the setting.

[0010] The handheld power tool preferably includes electronic components configured to control or regulate the handheld power tool, particularly its drive unit. The electronic components preferably have a circuit board on which electronic components, such as a computing unit and a memory unit, are arranged. Furthermore, the electronic components particularly include at least one sensor element. This sensor element may be arranged on the circuit board or connected to the circuit board in the housing of the handheld power tool or at another location on the housing. The electronic components may have a communication unit by means of which the electronic components can exchange information with another handheld power tool, handheld power tool accessories, external devices, etc. External devices may be configured, for example, as smartphones or servers. The communication unit may be configured, for example, as a USB interface (i.e., a wired connection interface), or as a Bluetooth or WLAN interface and thus wirelessly.

[0011] Furthermore, it is proposed that the idle speed of the handheld machine tool can be set to at least one value, preferably at least two values, through a user interface. The settable idle speed values ​​can be, for example, 200, 300, 400, or 500 revolutions per minute. Similarly, it is also possible for the user to arbitrarily set the idle speed between a minimum speed (e.g., 200 revolutions per minute) and a maximum speed (e.g., 500 revolutions per minute). The idle speed can be the motor idle speed or the tool receiving unit idle speed at which the insert tool rotates around its working axis.

[0012] Furthermore, it is proposed that the operating speed of the handheld power tool can be set to at least one value, preferably at least two values, via a user interface. Advantageously, this can provide an optimized mixing process. The settable operating speed can be, for example, 200, 300, 400, or 500 revolutions per minute. It is also conceivable that the operating speed can be arbitrarily set by the user between a minimum speed (e.g., 200 revolutions per minute) and a maximum speed (e.g., 500 revolutions per minute). The operating speed can be the motor operating speed or the tool receiving unit operating speed at which the insert tool rotates about its working axis. Preferably, the handheld power tool has a speed monitoring unit or a torque monitoring unit. The speed monitoring unit is particularly configured for sensing and controlling or regulating the speed. The torque monitoring unit is configured for sensing and controlling or regulating the torque. The speed monitoring unit and / or torque monitoring unit are particularly associated with the electronics of the handheld power tool. The speed monitoring unit and / or torque monitoring unit includes at least one sensor element, such as a speed sensor or a current sensor.

[0013] Furthermore, it is proposed that the handheld tool is constructed as a battery-operated handheld tool and particularly has a battery interface for connecting to a battery pack of the handheld tool. Advantageously, this allows for flexible use of the handheld tool. The battery pack is particularly constructed as a handheld tool battery pack. A battery interface is provided for connecting the battery pack to the handheld tool. The battery interface is preferably constructed for receiving a single battery pack on or within the handheld tool. Preferably, the handheld tool has a single battery interface. However, it is also conceivable that the handheld tool has multiple battery interfaces for connecting multiple battery packs. The battery interface is particularly inextricably connected to the housing of the handheld tool without tools. The handheld tool particularly has only a single battery pack in order to keep the total weight of the system consisting of the handheld tool and the battery pack as small as possible. The battery pack is particularly configured for power supply to the handheld tool. The battery pack has a housing preferably made of plastic, in which at least one battery cell is arranged. The battery cell can be constructed as a primary cell, having a structure in which one electrode is located at one end and the other at the opposite end. In particular, the battery cell has a positive electrode at one end and a negative electrode at the opposite end. Preferably, the battery cell is constructed as a NiCd or NiMH battery, and particularly preferably as a lithium-based battery or lithium-ion battery. The battery voltage of the battery pack is typically several times the voltage of a single battery cell and is determined by the connection method of the battery cells (parallel or series). These battery cells are arranged, in particular, in layers within the battery pack housing, wherein one layer preferably has five battery cells. The battery pack can be constructed as a single-layer, double-layer, triple-layer, or quadruple-layer battery pack. In particular, the height of the battery pack is greater than its width. The battery voltage of the battery pack is preferably 18V or 36V. The battery pack has a connection interface corresponding to the battery interface of a handheld machine tool. Through this connection interface, the battery pack can also be mechanically and electrically connected to a charging device. The battery pack is specifically designed as a replaceable battery pack.

[0014] Furthermore, it is proposed that the user interface has a communication unit configured for wireless communication with external devices. The communication unit is particularly configured as an electronic device in a handheld machine tool. Advantageously, this allows the handheld machine tool to be configured using an external device.

[0015] Furthermore, it is proposed that the user interface includes an input unit through which the user interface can be configured. The input unit is disposed on the housing of the handheld machine tool or on an external device. The input unit has at least one operating element, which can be configured as a button, keyboard, keypad, touchscreen, touch-sensitive housing surface, or similar element.

[0016] Furthermore, it is proposed that the user interface has a request unit for sensing the tool receiver and / or for sensing and receiving the inserted tool in the tool receiver. Advantageously, this allows for automatic setting of the handheld machine tool for the tool receiver or the inserted tool being used.

[0017] Furthermore, it is proposed that the receiving part of the mixing basket is provided with threads, which are configured for connection with the mixing basket (Rührkorb). Advantageously, this allows for a reliable connection of the mixing basket in the tool receiving part.

[0018] Furthermore, the present invention relates to a hammer drill comprising: a housing in which a drive unit and a pneumatic impact mechanism unit are arranged; a tool receiver for releasably receiving an insertable tool; and a tool receiver interface configured for releasably connecting a drill hammer to the tool receiver. The invention proposes that the tool receiver be configured as a mixing basket-shaped receiver. Advantageously, this allows the highly efficient hammer drill to be additionally used as a mixing device.

[0019] Furthermore, it is proposed that the hammer drill has an impact mechanism control device, which cannot be activated when connected to the receiving part of the mixing basket. The impact mechanism control device can be implemented electronically or mechanically. Attached Figure Description

[0020] Further advantages are illustrated in the accompanying drawings. The drawings, description, and claims contain multiple combinations of features. Those skilled in the art can also consider the stated features individually and summarize them into other meaningful combinations.

[0021] The attached diagram shows:

[0022] Figure 1 Side view of a handheld machine tool;

[0023] Figure 2 Longitudinal section of SDS-plus replaceable chuck;

[0024] Figure 3 Longitudinal section of the receiving part of the mixing basket-shaped component;

[0025] Figure 4 The longitudinal section of the stirring basket-shaped component, which is connected to the receiving part of the stirring basket-shaped component. Detailed Implementation

[0026] exist Figure 1The image shows a side view of a handheld power tool 10 in the form of a hammer drill 12. The handheld power tool 10 has a housing 13, which includes an outer shell 14 and an inner shell (not shown). A drive unit 20 with a motor 18 is arranged within the housing 13 of the handheld power tool 10. This drive unit transmits driving motion to a transmission unit 22, which has an impact mechanism 24. The impact mechanism 24 is, for example, configured as a pneumatic impact mechanism.

[0027] The inner housing comprises a motor housing (not shown) and a transmission housing 23, which are surrounded by an outer housing 14. The impact mechanism 24, particularly the transmission unit 22, is substantially entirely housed within the transmission housing 23. The transmission housing 23 at least partially extends a grease chamber containing lubricant for lubricating the transmission unit 22. The motor housing is specifically configured to receive and / or support the electric motor 18. The transmission housing 23 is, for example, made of a material different from the rest of the outer housing 14. The transmission housing 23 is, for example, made of a metallic material, while the motor housing and outer housing 14 are made of plastic. However, it is also conceivable that the transmission housing 23 is made of plastic. In particular, the transmission housing 23 and / or the motor housing have higher strength and / or heat resistance than the outer housing 14.

[0028] The drive motion of the drive unit 20 is transmitted to the tool receiving section 100 via the transmission unit 22, in which the insert tool 26 is releasably fixed. The insert tool is constructed as a rock drill bit for drilling holes in concrete. The insert tool 26 is constructed to be rotatable about a working axis 29 and / or linearly oscillating or impulsively driven along the working axis 29. Furthermore, the insert tool 26 can be driven to the right (or clockwise) or left. The working axis 29 extends, for example, intersecting with, and particularly substantially perpendicular to, the motor axis 17 of the drive unit 20.

[0029] The handheld power tool 10 has a handle 30. The handle extends substantially perpendicular to the working axis 29. The handle 30 is arranged on the side of the housing 13 opposite to the tool receiving section 100. The handle 30 has an operation switch 32, by which the handheld power tool 10 can be manually controlled, or in other words, turned on and off. The operation switch 32 is configured, for example, as a signal switch. The handle 30 is configured, for example, as a vibration-decoupled handle. The handle 30 is connected to the housing 13 of the handheld power tool 10, particularly via a damping unit 31. The handle 30 is movably connected to the housing 13 relative to the housing. In addition, the handheld power tool 10 has an additional handle 33, which is detachably connected to the housing 13.

[0030] The handheld power tool 10 is constructed as a battery-operated handheld power tool. For example, the handheld power tool 10 has a battery interface 36 through which the battery pack 38 can be electrically and mechanically connected to the handheld power tool 10 without tools. The battery pack 38 is arranged on the front side of the handheld power tool 10, facing the tool receiving section 100. The battery pack 38 has a battery pack housing 40, in which battery cells (not shown) are arranged in three layers, wherein each layer, for example, has five battery cells. Due to the number of layers, the battery pack 38 has a height perpendicular to the stacked layers, which is greater than the width of the battery pack 38.

[0031] The tool receiver 100 is specifically configured as a replaceable chuck 102. The replaceable chuck 102 is detachably connected to the handheld power tool 10 via a tool receiver interface 104. Such a tool receiver interface 104 is known to those skilled in the art and is described in various embodiments and is commercially available. The connection of the tool receiver 100 in the form of a replaceable chuck 102 is achieved by a force-locking and / or form-locking connection, which is configured to be detachable by the user of the handheld power tool 10. The connection may be configured to be detachable without a tool or with the aid of a tool (not shown), depending on the configuration of the replaceable chuck 102.

[0032] exist Figure 1 The replaceable chuck 102 shown is configured as an SDS-plus replaceable chuck 106 and in Figure 2 The replaceable chuck is shown in longitudinal section in its connected state with the handheld power tool 10. The SDS-Plus replaceable chuck 106 should be understood as a replaceable chuck 102 that is constructed with an SDS-Plus insertion end 28 for receiving or releasably securing the insert tool 26.

[0033] The impact mechanism 24 of the handheld machine tool 10 has a guide tube 25 configured as a hammer tube (see...). Figure 2 A piston (not shown) driven by an eccentric unit is linearly guided within the guide tube. This piston is configured to drive an impactor (not shown) and an impact bolt 27 (see...). Figure 2The impact bolt is also linearly supported in the guide tube 25. An air spring is formed between the impactor and the piston during impact operation of the handheld machine tool 10. The impact mechanism 24 has an impact mechanism control device (not shown in detail) that activates the impact mechanism. The impact mechanism control device is mechanically configured via a closable ventilation opening in the guide tube 25, through which impact mechanism control is performed via the impact bolt 27. The tool receiving section 100, particularly the SDS-Plus replaceable chuck 106, is constructed such that the received insert tool 26, configured as a rock drill bit, applies a force to the impact bolt 27, which moves the impact bolt 27 into the guide tube 25. This movement of the impact bolt 27 closes the ventilation opening in the guide tube 25, creating an air spring during operation and driving the insert tool 26 in a linear oscillating motion.

[0034] The handheld power tool 10 also includes electronics 42 configured to control or regulate the handheld power tool 10. Electronics 42 includes a circuit board and a memory unit, the circuit board having a computing unit in the form of a CPU. Electronics 42 also includes multiple sensor elements capable of sensing status information of the handheld power tool 10. The handheld power tool 10 includes, for example, a motion sensor in the form of an accelerometer. The accelerometer can be configured, for example, to distinguish between impact operation or load operation and idle operation of a hammer drill. Similarly, the motion sensor can be configured to sense and determine the orientation and position of the handheld power tool 10 in space or to sense and determine the rotation of the housing 13 of the handheld power tool 10 about the working axis 29, for example, in the event of contact with a rebar. The information sensed by the motion sensor is provided to electronics 42, which then operates the drive unit 20 based on this information. This control can be achieved, for example, by controlling the operating speed or load speed or by turning off or actively braking the drive unit. Furthermore, the handheld power tool 10 includes a speed sensor and a current sensor. A speed sensor is associated with the speed monitoring unit. The speed sensor may be configured as a Hall effect sensor, for example. A current sensor is associated with the torque monitoring unit. Therefore, the speed of the handheld machine tool 10 can be determined and sensed not only during load operation but also during idling operation, and this speed can be controlled or adjusted via electronic devices 42.

[0035] During idle operation, the insert tool 26 is driven at idle speed, where it is not under load. This means that no working processes, such as drilling, tightening, or mixing, occur. During loaded operation, the insert tool 26 is driven at load speed, where it is under load. The power consumption of the handheld power tool 10 is particularly higher during loaded operation than during idle operation. During loaded operation, the insert tool 26 is used for drilling, tightening, mixing, etc.

[0036] Electronic device 42 includes a communication unit 44 configured for wireless communication with an external device, such as a smartphone. Wireless communication is achieved, for example, via Bluetooth connectivity. In particular, this allows the handheld machine tool 10 to be controlled at least partially via an external device.

[0037] Furthermore, the handheld power tool 10 includes a user interface 46. The user interface 46 has a screen (not shown in detail) and input elements (not shown in detail). The screen of the user interface 46 can display operating or status information of the handheld power tool. The input elements of the user interface 46 can be used to set the screen display and / or the electronics 42, thereby setting the handheld power tool 10.

[0038] exist Figure 3 Another tool receiving section 100 is shown in longitudinal section, which is constructed as a stirring basket-shaped receiving section 110. The stirring basket-shaped receiving section 110 is also constructed as a replaceable chuck 102.

[0039] The mixing basket receiving portion 110 has an insert tool interface 112 for releasable connection to an insert tool 26 configured as a mixing basket 114. The insert tool interface 112 is configured with an internal thread 114, for example, an M14 thread. Furthermore, the mixing basket receiving portion 110 includes a handheld tool interface 116 for releasable connection to the tool receiving portion interface 104 of the handheld tool 10. The handheld tool interface 116 is preferably configured substantially the same as the handheld tool interface of the aforementioned SDS-plus replaceable chuck 106. The insert tool interface 112 and the handheld tool interface 116 are arranged on opposite sides of the mixing basket receiving portion 110.

[0040] The handheld power tool 10 can be connected to different tool receivers 100, such as the SDS-plus replaceable chuck 106 or the mixing basket receiver 110, via the tool receiver interface 104. Another tool receiver 100, not shown, is a clamping chuck-replaceable chuck configured to receive round shank drill bits.

[0041] exist Figure 4The diagram shows a cross-section of a handheld power tool 10, which is connected to a mixing basket receiving portion 110, and a mixing basket 114 is connected to the mixing basket receiving portion 110. The mixing basket 114 has an M14 external thread 118 in the region of its insertion end 120, which is constructed corresponding to the insertion tool interface 112 of the mixing basket receiving portion 110. The insertion tool interface 112 is constructed such that the impact mechanism control device of the machine is not activated. In particular, and exemplaryly, the insertion end 120 of the mixing basket 114 is received spaced apart from the impact bolt 27, so that the impact mechanism control device is not manipulated to activate the impact mechanism 24. Therefore, it can be ensured that the mixing basket 114 performs pure rotational motion, without linear oscillating motion.

[0042] For the operation of a hand-held machine tool 10 having an SDS-plus replaceable chuck 106 typically used for drilling or chiseling, it may be advantageous that the settings of the hand-held machine tool 10 are different from those in the operation of a hand-held machine tool 10 having a mixing basket-shaped receiving section 110 typically used for mixing.

[0043] Therefore, the hammer drill mode and the mixing mode can be set via the user interface 46. The user interface 46 may have multiple hammer drill modes and / or multiple mixing modes, which the user can select between. The mode setting can be achieved, for example, through the operating element of the user interface 46 on the handheld power tool 10 or through an app on a smartphone. The difference between the hammer drill mode and the mixing mode lies particularly in the operating speed and / or idle speed. Preferably, parameters can be set to different values ​​in the mixing mode than in the hammer drill mode. For example, the operating speed or idle speed can be set to a different speed in the mixing mode than in the hammer drill mode. Additionally, parameters can be set in the mixing mode than in the impact drill mode. An example of these parameters is the mixing time during which the handheld power tool 10 operates in the mixing mode and during which the handheld power tool can be locked, for example, so that the user does not have to continuously press the operation switch 32. In this embodiment, the user must select the mode. However, it is also conceivable that the tool receiving section 100 or the insert tool 26 is identified by the handheld power tool 10 or an external device and set at least partially automatically.

Claims

1. A handheld machine tool, comprising: The housing (13) contains a drive unit (20) and an impact mechanism unit (24). A tool receiving interface (104) is configured to releasably connect the handheld power tool (10) to the tool receiving unit (100), wherein, The tool receiving part (100) is configured as a stirring basket-shaped receiving part (110). Its features are, The handheld power tool (10) has a user interface (46) through which at least one hammer drill mode and a stirring mode can be set. In the stirring mode, a stirring time is set. During the stirring time, the handheld power tool (10) operates in the stirring mode and is locked during the stirring time, so that it is not necessary to continuously press the operation switch (32) of the handheld power tool (10).

2. The handheld machine tool according to claim 1, characterized in that, The idle speed of the handheld machine tool (10) can be set to at least one value through the user interface (46).

3. The handheld machine tool according to claim 1 or 2, characterized in that, The operating speed of the handheld machine tool (10) can be set to at least one value through the user interface (46).

4. The handheld machine tool according to claim 1 or 2, characterized in that, The handheld power tool (10) constitutes a battery-powered handheld power tool.

5. The handheld machine tool according to claim 1 or 2, characterized in that, The handheld machine tool (10) has a communication unit (44) configured to communicate with an external device (200).

6. The handheld machine tool according to claim 5, characterized in that, The user interface (46) includes an input unit through which the user interface (46) can be configured. The input unit is arranged on the housing (13) of the handheld machine tool (10) or on the external device (200).

7. The handheld machine tool according to claim 1 or 2, characterized in that, The user interface (46) has a request unit for sensing the tool receiving unit (100) and / or for sensing the insertable tool (26) received in the tool receiving unit (100).

8. The handheld machine tool according to claim 1, having a tool receiving section (100) configured as a mixing basket-shaped receiving section (110).

9. The handheld machine tool according to claim 8, characterized in that, The receiving part (110) of the mixing basket is provided with threads, which are configured to connect with the mixing basket (114).

10. The handheld machine tool according to claim 1, characterized in that, The hammer drill has an impact mechanism control device, which cannot be activated when connected to the mixing basket receiving part (110).

11. The handheld machine tool according to claim 2, characterized in that, The user interface (46) allows the idle speed of the handheld machine tool (10) to be set to at least two values.

12. The handheld machine tool according to claim 3, characterized in that, The operating speed of the handheld machine tool (10) can be set to at least two values ​​through the user interface (46).

13. The handheld machine tool according to claim 4, characterized in that, The handheld power tool (10) has a battery interface (36) for connecting to a battery pack (38).

14. The handheld machine tool according to claim 5, characterized in that, The communication unit (44) is configured to communicate wirelessly with an external device (200).

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