Hand-held power tool

Abstract

The present invention is based on a handheld machine tool (10), particularly an electric hammer, drill hammer, and / or chisel hammer, having at least one electric motor (22), a tool unit (16), and at least one operating unit (14), and having a motor switching unit (66) configured to sense a clamping force characteristic parameter between the tool unit (16) and the operating unit (14). It is proposed that the motor switching unit (66) be configured to switch the electric motor (22) at least partially in relation to the clamping force characteristic parameter.

Description

Background Technology

[0001] A handheld machine tool, particularly an electric pick, drill hammer, and / or chisel hammer, has been proposed, the handheld machine tool having at least one electric motor, a tool unit, and at least one operating unit and having a motor switching unit configured to sense clamping force characteristic parameters between the tool unit and the operating unit. Summary of the Invention

[0002] The present invention relates to a handheld machine tool, particularly an electric pick, drill hammer, and / or chisel hammer, the handheld machine tool having at least one electric motor, a tool unit, and at least one operating unit and having a motor switching unit configured to sense a clamping force characteristic parameter between the tool unit and the operating unit.

[0003] It is proposed that the motor switching unit is configured to switch electric motors at least partially in relation to the clamping force characteristic parameters.

[0004] Preferably, the handheld tool is constructed as a portable machine tool, such as an electric hammer, drill hammer, and / or chisel hammer. However, it is also conceivable that the handheld tool may have other configurations that are meaningful to those skilled in the art. Preferably, the handheld tool has a maximum weight of 30 kg, preferably a maximum of 15 kg. The handheld tool preferably has a tool receiving section. The handheld tool preferably has a main handle housing. The tool receiving section is preferably arranged on the tool unit of the handheld tool. The main handle housing is preferably arranged on the operating unit. Preferably, the operating unit is movably, in particular, movable, supported relative to the tool unit. The handheld tool preferably defines a longitudinal axis. Preferably, the operating unit is supported via a bearing unit of the handheld tool in a manner movable relative to the tool unit, preferably at least substantially parallel to the longitudinal axis. The bearing unit preferably has at least one spring unit to dampen bearing movement and / or impact operation on the operating unit. Preferably, the bearing unit is configured to realize force transmission from the tool unit to the operating unit. The “longitudinal axis” of the object should be understood in particular as a geometric axis that extends parallel to the longest edge of the smallest geometric cuboid that just completely surrounds the object. The longitudinal axis of the handheld power tool extends through the main handle, which is formed by the main handle housing, from the main handle itself. This longitudinal axis extends at least substantially parallel to the rotation axis of the handheld power tool, particularly the tool receiving portion. The rotation axis of the handheld power tool, especially the tool receiving portion, is about which the tool receiving portion can rotate, particularly in at least one operating state. Specifically, the motor switching unit is arranged on the handheld power tool in a manner that is at least substantially invisible from the outside. Preferably, the motor switching unit is at least substantially entirely located inside the handheld power tool. "An object is at least substantially entirely located inside the handheld power tool" should be understood in particular as: an imaginary straight line originating from the geometric center point of the longitudinal axis in the handheld power tool, passing through the motor switching unit, intersects at least one other part of the handheld power tool, different from the motor switching unit, on the side of the longitudinal axis opposite to the center point, particularly intersecting at least one housing portion. "Substantially parallel" should be understood here in particular as an orientation of a direction relative to a reference direction, especially in a plane, wherein the direction has a deviation of less than 8°, advantageously less than 5° and particularly advantageously less than 2° relative to the reference direction.

[0005] Preferably, the motor switching unit is configured to sense and process clamping force characteristic parameters between the tooling unit and the operating unit. In particular, the motor switching unit includes at least one sensor element for sensing the clamping force characteristic parameters.

[0006] The "clamping force characteristic parameter" should preferably be understood as a characteristic parameter from which the clamping force can be inferred, wherein the clamping force characteristic parameter is configured in particular in relation to the clamping force between the tool unit and the operating unit. Preferably, the clamping force characteristic parameter is directly or indirectly proportional to the clamping force between the tool unit and the operating unit. For example, the clamping force characteristic parameter can be the stroke length of an element, such as a sensor element, especially a piezoelectric sensor element, in terms of stretching or compression. For example, the clamping force characteristic parameter can be the frequency, especially the frequency shift, of an electromagnetic wave or sound wave, which is affected, for example, by a stretched or compressed sensor element, such as by a Bragg fiber. For example, the clamping force characteristic parameter can be configured as a force or pressure. For example, the clamping force characteristic parameter can also be configured as the voltage or current intensity, especially sensed by a piezoelectric sensor element. In particular, the clamping force characteristic parameter can also be configured as torque. Preferably, at least one sensor element is configured as a force sensor, an optical sensor, especially a grating, a motion sensor, especially an acceleration sensor, and / or a velocity sensor. Preferably, the sensor element is configured to sense a clamping force characteristic parameter that is at least partially a continuous variable. Alternatively, at least one sensor element can be configured as a mechanical switch capable of sensing a binary clamping force characteristic parameter. Preferably, the sensor element is configured to sense the relative movement of the operating unit relative to the tool unit and / or to be manipulated during relative movement, particularly in the area of ​​relative movement. The sensor element can be configured, in particular, as a reed switch. The sensor element can also be configured, in particular, as a proximity switch, magnetic switch, and / or ultrasonic switch. The motor control unit can be configured as an acceleration control unit that switches the rotational speed of the electric motor and preferably controls and / or adjusts the relative movement of the operating unit relative to the tool unit in proportion to the clamping force characteristic parameter.

[0007] Preferably, the motor switching unit is configured as a motor control unit and / or a motor regulating unit. Preferably, the motor switching unit is configured to turn on the electric motor, particularly to regulate the motor speed of the electric motor from zero to a speed other than zero. Preferably, the motor switching unit is configured to turn off the electric motor. Preferably, the motor switching unit is configured to regulate the speed of the electric motor from a speed other than zero to zero. Preferably, the motor switching unit is configured to control and / or regulate the motor speed of the electric motor based on a sensed clamping force characteristic parameter. Preferably, the motor switching unit is configured to increase the motor speed of the electric motor based on a sensed clamping force characteristic parameter. Preferably, the motor switching unit is configured to increase the motor speed of the electric motor when the clamping force corresponding to the sensed clamping force characteristic parameter increases. Preferably, the motor switching unit is configured to increase the motor speed of the electric motor to a maximum speed when the clamping force corresponding to the sensed clamping force characteristic parameter increases beyond a threshold speed.

[0008] Preferably, the motor switching unit is configured to place the handheld power tool into rotary operation based on sensed clamping force characteristic parameters. In this rotary operation, an electric motor drives the embedded tool arranged in the tool receiving section to rotate. Preferably, the motor switching unit is configured to place the handheld power tool into impact operation based on sensed clamping force characteristic parameters, particularly when the sensed clamping force characteristic parameters exceed a threshold. In this impact operation, the electric motor drives the embedded tool arranged in the tool receiving section to impact, particularly periodic impact. Preferably, the motor switching unit is configured to place the handheld power tool into impact operation when the sensed clamping force characteristic parameters exceed the threshold, particularly an impact limit value. The motor switching unit can be configured to simultaneously place the handheld power tool into rotary operation and impact operation. The motor switching unit can be configured to increase the rotational speed of rotary operation as the clamping force characteristic parameters, particularly the clamping force, increase until the maximum rotational speed of rotary operation is reached, particularly until the impact limit value is reached, from which impact operation begins. In particular, at least one sensor element can be arranged and / or configured as an end-stop sensor element. In particular, at least one sensor element can be configured as pressure-sensitive. Alternatively or additionally, the motor switching unit can have a switch configured as a safety switch to prevent accidents, which is particularly arranged outside the cover unit.

[0009] The configuration of this invention, with its handheld machine tool, advantageously enables uncomplicated operation. In particular, it advantageously reduces the risk of accidental operation. In particular, its visual appearance is advantageously different from the conventional practice of pistol-like operating elements. In particular, it advantageously eliminates the need for external operating elements. It advantageously protects the cable, especially by completely concealing the cable within the handheld machine tool. In particular, it advantageously allows the user to place the workpiece with precise purpose.

[0010] Furthermore, it is proposed that the handheld machine tool has a pneumatic impact mechanism and a tool receiving unit for receiving, in particular, the aforementioned embedded tool, wherein the embedded tool can be driven along the working axis, and wherein the motor switching unit is configured to reduce the motor speed of the electric motor based on sensed clamping force characteristic parameters, in particular reducing the motor speed to a stationary state. For example, the tool receiving unit can be configured as a jaw chuck, Tool receiving section Plus tool receiving section Max tool receiving section or the like. Preferably, the working axis is oriented at least substantially parallel to the rotation axis and / or longitudinal axis of the handheld machine tool. Preferably, the motor switching unit is configured to reduce the motor speed of the electric motor when the clamping force corresponding to the sensed clamping force characteristic parameter decreases. Preferably, the motor switching unit is configured to reduce the motor speed of the electric motor to a stationary state when the clamping force corresponding to the sensed clamping force characteristic parameter decreases to below a threshold. This enables the realization of an advantageously durable handheld machine tool. In particular, it advantageously reduces the risk of impact to the handheld machine tool, especially to the user of the handheld machine tool.

[0011] Furthermore, it is proposed that the handheld machine tool has a pneumatic impact mechanism and a tool receiver for receiving an embedded tool, wherein the embedded tool can be driven along the working axis, and wherein the motor switching unit is configured to reduce the motor speed of the electric motor based on the sensed clamping force characteristic parameters, thereby preventing activation of the impact mechanism. "Preventing activation of the impact mechanism when the motor speed is reduced" should be understood in particular as follows: when the motor speed is reduced, the air spring pressure in the pneumatic impact mechanism is at most 50%, preferably at most 30%, particularly preferably at most 20%, and completely particularly preferably at most 10% of the maximum air spring pressure in the pneumatic impact mechanism during impact operation. Preferably, the maximum air spring pressure during impact operation is approximately 10 bar. In particular, the maximum air spring pressure is the maximum pressure reached in the hammer tube between the piston and the impactor. This enables the realization of an advantageously durable handheld machine tool. In particular, it advantageously avoids the risk of impact to the handheld machine tool, especially to the user of the handheld machine tool.

[0012] Furthermore, it is proposed that the motor switching unit is configured for passively and / or actively braking the electric motor. Preferably, the electric motor is configured as a DC / EC motor or an AC / EC motor. Preferably, the motor switching unit is configured to brake the electric motor by short-circuiting or reverse-energizing. Preferably, the motor switching unit is configured to passively and / or actively brake the motor speed of the electric motor based on sensed clamping force characteristic parameters, when the clamping force decreases corresponding to the clamping force characteristic parameters. In particular, the sensor element configured as a proximity switch may already have the intention to adjust, sense operation, and actively brake the electric motor in a targeted manner, especially up to 75 ms faster than in the case of a sensor element configured as a pressure switch. Especially when adjusting the operation of a handheld machine tool, a faster motor stop can be achieved advantageously. Alternatively, the electric motor can also be operated to a stop without braking, especially without speed adjustment. In particular, the risk of injury to the user of the handheld machine tool can be advantageously limited. In particular, leerschlag can be advantageously avoided.

[0013] Furthermore, it is proposed that the tool unit is at least partially constituted by an impact mechanism housing. Preferably, the tool unit is at least partially constituted by an impact mechanism housing and a tool receiving section. Preferably, the tool unit is at least partially constituted by an electric motor. The impact mechanism housing is preferably constructed as an inner housing. This enables the realization of an advantageous, large, and protected tool unit. It also enables the advantageous operability of the motor switching unit.

[0014] Furthermore, it is proposed that the operating unit is at least partially constituted by the main handle housing. Preferably, the operating unit is at least largely constituted by the main handle housing. Preferably, the main handle housing forms the main handle at one end of the extension along the longitudinal axis of the handheld machine tool. The main handle housing can have an additional handle. The main handle housing is preferably constructed as an outer shell. This allows for the realization of an advantageously large and protected operating unit. It also allows for the advantageous operability of the motor switching unit.

[0015] Furthermore, it is proposed that the motor switching unit is configured to assign the activation state of the electric motor to the measurement range of the clamping force characteristic parameter. Preferably, the measurement range is configured such that the clamping force characteristic parameter is within a range above or below at least a threshold, particularly depending on the ratio of the clamping force characteristic parameter to the clamping force. Preferably, the motor switching unit is configured to place the electric motor into an activated state within the measurement range. Preferably, the activated state of the electric motor is a state in which the electric motor has a rotational speed other than zero, particularly for rotary and / or impact operation of handheld machine tools. Advantageous on / off state control can be achieved by the motor switching unit, which is particularly advantageously programmable for different usage conditions. For example, an advantageous low-noise indoor drilling program for concrete walls can be implemented. Alternatively, an advantageous powerful outdoor drilling program for asphalt, stone, or the like can be implemented.

[0016] Furthermore, it is proposed that the motor switching unit is configured to switch the electric motor at least partially in a time-dependent manner. Preferably, the motor switching unit is configured to switch the electric motor at least partially in a time-dependent manner with reference to at least one threshold value exceeding and / or falling below the clamping force characteristic parameter. In particular, the motor switching unit can be configured to change the rotational speed of the electric motor, especially when the clamping force characteristic parameter increases and / or decreases, and when the condition of exceeding and / or falling below at least one threshold value of the clamping force characteristic parameter persists for a longer than a defined time period. Advantageous uniform, and in particular, insensitive rotational and / or shock operation can be achieved. Furthermore, it is proposed that the motor switching unit is configured to switch the electric motor at least partially in a torque-dependent manner. Preferably, the clamping force characteristic parameter is configured as torque, as a characteristic parameter proportional to torque, and / or as a characteristic parameter from which torque can be calculated. Preferably, the motor switching unit is configured to preferably obtain the torque from the clamping force characteristic parameter. In particular, the motor switching unit can include additional sensor elements for sensing the torque characteristic parameter. Preferably, the torque characteristic parameter is constructed as torque, as a characteristic parameter proportional to torque, and / or as a characteristic parameter from which torque can be calculated.

[0017] Preferably, the motor switching unit is configured to switch the electric motor at least partially in relation to torque, referencing at least one threshold value exceeding and / or falling below the clamping force characteristic parameter and / or torque characteristic parameter. In particular, the motor switching unit can be configured to change the speed of the electric motor, especially when the clamping force characteristic parameter and / or torque characteristic parameter increases and / or decreases, or when the condition of exceeding and / or falling below at least one threshold value of the clamping force characteristic parameter and / or torque characteristic parameter persists for a longer than a defined time period. This enables advantageously uniform, and especially insensitive, rotary and / or shock operation. In particular, it advantageously ensures chip removal from the workpiece when the hand-held machine tool is turned off and / or when the clamping force of the hand-held machine tool decreases.

[0018] Furthermore, it is proposed that the handheld machine tool has a cover unit, as previously mentioned, wherein the motor switching unit has at least one operating element, which is completely covered by the cover unit. Preferably, the cover unit is at least largely composed of a main handle housing and an impact mechanism housing. The cover unit can be partially composed of a bearing housing of a bearing unit. In particular, the cover unit is constructed as a multi-shell housing. In particular, the operating element can be arranged in the bearing housing. Preferably, the operating element is at least partially composed of at least one sensor element of the motor switching unit. Preferably, at least one operating element of the motor switching unit, and in particular each operating element, is at least substantially completely arranged inside the handheld machine tool. "At least one operating element is at least substantially completely arranged inside the handheld machine tool" should be understood in particular as: an imaginary straight line originating from the geometric center point of the longitudinal axis of the handheld machine tool and passing through the motor switching unit intersects at least one additional part of the handheld machine tool, different from the motor switching unit, on the side of the longitudinal axis opposite to the center point, in particular with at least a portion of the cover unit. This enables the machine to be advantageously placed on the workpiece to be processed without rotating at all. In particular, it can significantly improve the safety standards of handheld machine tools. It allows for switching of the electric motor only when needed. It enables the construction of advantageously energy-efficient handheld machine tools.

[0019] Furthermore, it is proposed that the motor switching unit has at least one switching element configured to relate to a clamping force characteristic parameter and to control and / or regulate the motor speed of the electric motor within at least one speed range. Preferably, the switching element is configured to control and / or regulate the motor speed of the electric motor within at least one speed range when the clamping force characteristic parameter exceeds a threshold. Preferably, this speed range is a speed range between a minimum speed other than zero, particularly an impact activation speed and a maximum speed. Preferably, the impact activation speed corresponds to the maximum speed of rotational operation without impact, particularly the speed at which the clamping force characteristic parameter has reached the threshold for impact activation. Preferably, the switching element is configured to switch the electric motor to a standard speed, particularly an idle speed, especially without controlling or regulating the electric motor, when the clamping force characteristic parameter no longer exceeds the threshold for rotational operation and / or impact operation. Alternatively, the switching element can be configured to monitor, particularly control and / or regulate the idle speed. This enables an advantageous and uncomplicated speed start-up phase for the electric motor. It can achieve a favorable operating speed range in which the speed of the electric motor is continuously controlled and / or adjusted within the speed range according to the clamping force characteristic parameters.

[0020] Furthermore, it is proposed that the handheld machine tool has at least one backup switch configured to switch the electric motor to a standby state, particularly one with no rotational speed, or from a standby state, particularly one with no rotational speed, to a safe state. Preferably, the standby state is configured as a powered state for the electric motor, in which the electric motor is electrically connected to an energy source. Alternatively or additionally, the standby state can be configured as a locked state of relative movement of the tool unit relative to the operating unit. Preferably, the handheld machine tool includes at least one display unit, particularly a light-emitting unit and / or an acoustic unit, for visually and / or audibly displaying the standby state. The display unit can alternatively or additionally be configured as a haptic feedback unit, which in particular triggers light impact operation with a small, non-zero rotational speed. In particular, the display unit can be configured to emit different tones, preferably from acoustic signals to melodies, for example, through rotational impacts (Drehzahlschub) on the electric motor. In particular, the display unit can be configured as a work light for the handheld machine tool, configured to illuminate the workpiece to be processed. In particular, the display unit can be configured to display different flash patterns and / or flash frequencies, brightness and / or color changes. Advantageously, this can reduce the risk of injury caused by accidental activation of the handheld machine tool.

[0021] Furthermore, it is proposed that at least one backup switch is configured as a contact switch and / or a signal switch. This at least one backup switch is preferably configured in at least one switching state to interrupt power supply to the electric motor. The at least one backup switch can alternatively or additionally be configured in at least one switching state to lock the relative movement of the tool unit relative to the operating unit. The backup switch can be configured in particular as a pressure switch, a slide switch, or a similar switch. In particular, the backup switch can be configured as a capacitive switch or an inductive switch, especially for detecting the presence of a user. The backup switch can be particularly configured as a reed switch. The backup switch can particularly be configured as a proximity switch, a magnetic switch, and / or an ultrasonic switch. Advantageously, the risk of injury due to accidental activation of the handheld machine tool can be reduced.

[0022] Furthermore, it is proposed that the handheld machine tool has a construction without an impact mechanism control device. "The handheld machine tool has a construction without an impact mechanism control device" should preferably be understood as: the handheld machine tool is constructed without an impact mechanism control device other than the motor switching unit. In particular, the motor switching unit is constructed for controlling and / or regulating the impact operation and rotational operation, especially of drill hammers. In particular, the motor switching unit is constructed for switching the impact operation on or off at least in a binary manner. Preferably, the motor switching unit is constructed for controlling and / or regulating the impact operation based on clamping force characteristic parameters. In particular, the motor switching unit is constructed for controlling or regulating the impact operation and rotational operation, especially of drill hammers. This allows for the construction of advantageously compact and / or lightweight handheld machine tools. In particular, it allows for the construction of handheld machine tools that are advantageously short along the longitudinal axis. In particular, the tool receiving section can be constructed without an idle stroke. Particularly preferably, the embedded tool rests against a part of the pneumatic impact mechanism in each operating state. This advantageously enables operation horizontally and / or vertically without idle impact. A particularly advantageous wear-resistant handheld machine tool can be achieved through, for example, the use of advantageous, low-load-bearing seals and / or damping elements in the pneumatic impact mechanism.

[0023] Furthermore, it is proposed that the handheld machine tool has: in particular, the already mentioned hammer tube, and in particular, the guide tube, which is constructed without a closable opening, in particular a control opening or an idle opening; and / or has at least one impact mechanism housing and at least one impact bolt, which is supported at least substantially immovably in the impact mechanism housing in the impact direction. The hammer tube is particularly constructed as a guide for guiding a part of the pneumatic impact mechanism, in particular a piston, impactor, impact bolt, or punch. In particular, the hammer tube can be constructed without a control opening or an idle opening. The impact bolt being supported "at least substantially immovably" in the impact mechanism housing in the impact direction should preferably be understood as: the impact bolt being immovably supported in the impact mechanism housing in the impact direction except for a maximum deviation of 5 mm, preferably a maximum of 2 mm, particularly preferably a maximum of 0.5 mm determined by damping. An advantageously compact handheld machine tool can be achieved. In particular, the seal for the impact bolt can be constructed as an advantageously low-wear and / or low-cost static seal. It is possible to achieve that the user only needs to apply an advantageously small clamping force to operate the handheld machine tool. The tool receiver can be constructed to be larger, preferably with a longer engagement, which can advantageously improve stability. In particular, it can advantageously reduce the vibration load acting on the handheld machine tool.

[0024] Furthermore, it is proposed that the handheld machine tool has a battery unit. Preferably, the battery unit is detachably connected to the handheld machine tool. Preferably, the battery unit is configured to supply electrical power to the handheld machine tool as a primary energy source. With the battery unit, the handheld machine tool is particularly configured as a portable handheld machine tool. Alternatively, the handheld machine tool can be configured to operate using a cable connected to a socket. This enables the advantageous portability of the handheld machine tool.

[0025] In particular, the motor switching unit can be configured to place the pneumatic impact mechanism into a continuous impact state. Specifically, the motor switching unit can be configured to actively reduce the motor speed, especially when the standby switch is turned off. This achieves favorable idling vibration, favorable noise generation, and / or favorable energy consumption. The standby switch can be connected to the motor switching unit via an electromechanical coupler, preferably for particularly rapid switching on and / or off of the electric motor. The handheld machine tool preferably has a drive unit. The standby switch can be bridged for sustained motor function, especially when mechanical coupling is detected by current monitoring in the case of a drill hammer, or when a frequency band change in the accelerometer is detected. Specifically, a stuck drill bit can be put into rotation by coupling torque. Specifically, the handheld machine tool can have a mode switch for sensing the desired operating mode, especially impact operation and / or rotary operation. Preferably, this mode switch can be controlled via a mobile application. Specifically, impact operation and / or rotary operation are configured to be selectable via a mobile application. The standby switch can be configured as a bistable switch.

[0026] The handheld machine tool of the present invention should not be limited to the applications and embodiments described above. In particular, the handheld machine tool of the present invention can have a different number of individual elements, components, and units than those mentioned herein in order to fulfill the functional modes described herein. Furthermore, regarding the value ranges given in this disclosure, values ​​within the mentioned boundaries should also be considered as disclosed and freely usable. Attached Figure Description

[0027] Further advantages are illustrated in the following figures. Embodiments of the invention are shown in the figures. The figures, description, and claims contain combinations of multiple features. Those skilled in the art can view these features individually as suitable for their purpose and combine them into other meaningful combinations.

[0028] The attached diagram shows:

[0029] Figure 1 The handheld machine tool of the present invention is shown in a schematic view.

[0030] Figure 2 The clamping force characteristic parameter curves and speed curves of the handheld machine tool of the present invention are shown schematically.

[0031] Figure 3 The clamping force characteristic parameter curves and speed curves of the handheld machine tool of the present invention are shown schematically.

[0032] Figure 4 The clamping force characteristic parameter curves and speed curves of the handheld machine tool of the present invention are shown schematically.

[0033] Figure 5 The torque characteristic parameter curve, clamping force characteristic parameter curve, and standby switch status curve or motor switching unit status curve of the handheld machine tool of the present invention are shown in schematic view. Detailed Implementation

[0034] Figure 1 A handheld power tool 10 is shown. The handheld power tool 10 is constructed as a chisel hammer. However, it is also conceivable that the handheld power tool 10 may have other configurations that are meaningful to those skilled in the art.

[0035] The handheld power tool 10 includes an operating unit 14. The handheld power tool 10 also includes a tool unit 16.

[0036] The handheld power tool 10 includes a cover unit 12. The handheld power tool 10 includes a main handle housing 18, which specifically constitutes a main handle 32. The handheld power tool 10 includes an impact mechanism housing 26, which is specifically configured to receive an impact mechanism 20.

[0037] The operating unit 14 is partially constituted by the main handle housing 18. The tool unit 16 is partially constituted by the impact mechanism housing 26. The cover unit 12 is partially constituted by the main handle housing 18. The cover unit 12 is partially constituted by the impact mechanism housing 26. The cover unit 12 is at least substantially constituted by the main handle housing 18 and the impact mechanism housing 26. The impact mechanism housing 26 is constructed as an inner housing, particularly for the pneumatic impact mechanism 20, the electric motor 22, and the battery unit 36. The main handle housing 18 is constructed as an outer housing, particularly for receiving the impact mechanism housing 26 in a supported manner.

[0038] Tool unit 16 is arranged on the front region 28 of main handle housing 18. The main handle housing 18 is shaped on the end region 30 to form the main handle 32, in particular for guiding the hand-held machine tool 10 and for applying the operator's force to the hand-held machine tool 10.

[0039] The handheld power tool 10 is implemented with a detachable additional handle 34. The additional handle 34 can be detachably fixed to the portable handheld power tool 10 by means of a locking connection or other connection that is deemed meaningful by those skilled in the art. The additional handle 34 is arranged in the impact mechanism housing 26 for operator guidance of the handheld power tool 10.

[0040] The handheld power tool 10 also includes an electric motor 22. The handheld power tool 10 has a transmission unit 24. Both the electric motor 22 and the transmission unit 24 are arranged in the cover unit 12. Both the electric motor 22 and the transmission unit 24 are arranged in the impact mechanism housing 26. In particular, the electric motor 22 partially constitutes the tool unit 16. In particular, the transmission unit 24 partially constitutes the tool unit 16. The handheld power tool 10 includes a battery unit 36. The battery unit 36 ​​is arranged in the impact mechanism housing 26. The battery unit 36 ​​particularly partially constitutes the tool unit 16. The battery unit 36 ​​is configured to supply electrical power to the electric motor 22. The battery unit 36 ​​is arranged to be removable from the impact mechanism housing 26, for example, via electrical plug contacts and / or locking contacts. In particular, the impact mechanism housing 26 can be removed from the main handle housing 18.

[0041] The handheld power tool 10 has a tool receiver 38 for receiving an embedded tool 40. The embedded tool 40 is exemplarily configured as a chisel. The tool receiver 38 is arranged in the front region 28 of the handheld power tool 10. The tool receiver 38 is particularly configured as... - Tool receiving section. The tool receiving section 38 can have any configuration that is meaningful to those skilled in the art, such as a jaw chuck, -Plus- Tool Receiving Department -Max- configuration of a tool receiver or similar.

[0042] The handheld power tool 10 defines the longitudinal axis 42 from the main handle 32 to the tool interface 38, especially along the tool longitudinal axis of the embedded tool 40 in the running state.

[0043] The longitudinal axis 42 of the handheld power tool 10 extends from the main handle housing 18 and through the handheld power tool 10 in a direction toward the tool receiver 38. The longitudinal axis 42 extends at least substantially parallel to the rotation axis 44 of the handheld power tool 10, particularly the tool receiver 38, and preferably the embedded tool 40, especially when the handheld power tool 10 is configured as a drill hammer. The rotation axis 44 of the handheld power tool 10, especially the tool receiver 38, is the axis around which the handheld power tool 10, particularly in at least one operating state, is capable of rotation, especially when the handheld power tool 10 is configured as a drill hammer. The handheld power tool 10 can have the embedded tool 40.

[0044] The handheld machine tool 10 particularly includes at least one pneumatic impact mechanism 20. The pneumatic impact mechanism 20 is at least substantially disposed in the impact mechanism housing 26. The pneumatic impact mechanism 20 partially constitutes the tool unit 16. The tool receiving part 38 partially constitutes the tool unit 16.

[0045] The pneumatic impact mechanism 20 includes, in particular, a hammer tube 46 and, especially, a guide tube. The hammer tube 46 and, especially, the guide tube, are configured not to have a closable opening. The hammer tube 46 and, especially, the guide tube, are configured not to have a closable opening, particularly a control opening or an idling opening. In particular, the hammer tube 46 is configured not to have an opening in the region between the piston 56 and the impactor 58.

[0046] The maximum air spring pressure, especially the maximum pressure reached between piston 56 and impactor 58 in hammer tube 46 during impact operation. In particular, piston 56 moves so slowly during impact operation that the maximum air spring pressure reaches a maximum of 1 bar and effectively prevents activation of the impact mechanism.

[0047] The pneumatic impact mechanism 20 includes an impact bolt 48. The impact bolt 48 is supported in the impact mechanism housing 26, particularly by bearings and / or spring elements 50, in a manner that makes it immovable at least substantially along the impact direction 52, and especially at least with respect to the hammer tube 46. The impact direction 52 corresponds to the longitudinal axis 42.

[0048] The embedded tool 40 can be driven along the working axis 54, in particular by an electric motor 22 via a transmission unit 24 and / or a pneumatic impact mechanism 20.

[0049] In order to generate and / or transmit impact pulses via the pneumatic impact mechanism 20, the handheld machine tool 10 has an electric motor 22 and a transmission unit 24.

[0050] The axis of motion 60 of the impact elements—especially the piston 56, the impactor 58, and the pneumatic impact mechanism 20—extends parallel to the longitudinal axis 42 of the tool receiving section 38, especially parallel to the impact direction 52 or parallel to the working axis 54. It is also conceivable, in principle, that the driving torque for generating the rotational motion of the tool receiving section can be transmitted to the tool receiving section via, for example, the hammer tube of the pneumatic impact mechanism, in a manner known to those skilled in the art, through a transmission unit.

[0051] The handheld machine tool 10 has a bearing unit 62. The operating unit 14 is supported via the bearing unit 62 in a manner that allows linear movement relative to the tool unit 16, preferably at least substantially parallel to the longitudinal axis 42, and especially parallel to the working axis 54. The bearing unit 62 has a spring unit 64 for elastically controlling the movement of the bearing and the force transmission to the operating unit 14, especially during impact operation. The bearing unit 62 also has a reset element that resists movement of the tool unit 16 toward the main handle 32, so as to return to the initial position in the absence of applied clamping force, especially in the absence of clamping force applied to the workpiece.

[0052] The handheld power tool 10 can have a backup switch 68, which is particularly useful in... Figure 1 As shown in the diagram. The backup switch 68 is configured to switch the electric motor 22 to a standby state, particularly one with no speed, or from a standby state, particularly one with no speed, to a safe state. The standby state is configured as a power-on state for the electric motor 22, in which the electric motor 22 is electrically connected to an energy source, particularly the battery unit 36. Alternatively or additionally, the standby state can be configured as a locked state for the bearing unit 62, particularly a locked state for the relative movement of the tool unit 16 relative to the operating unit 14. The backup switch 68 can be configured as a contact switch and / or a signal switch. The backup switch 68 can be particularly located on the exterior of the main handle housing 18 (in...). Figure 1 (As shown in the figure). In principle, the backup switch 68 can also be located at other locations on the handheld machine tool 10 that are deemed meaningful by those skilled in the art.

[0053] The handheld power tool 10 can have a display unit 70, especially a light-emitting unit and / or an acoustic unit, for visually and / or audibly displaying the standby status. The display unit 70 is particularly arranged on the outside of the main handle housing 18 or the impact mechanism housing 26, especially near the tool receiving section 38.

[0054] The handheld power tool 10 has a motor switching unit 66. The motor switching unit 66 is configured to sense the clamping force characteristic parameter between the tool unit 16 and the operating unit 14.

[0055] The motor switching unit 66 has two actuating elements 72, and in particular and / or two switching elements 74, which are completely covered by the covering unit 12. The actuating elements 72, and in particular the two switching elements 74, are configured to sense the clamping force characteristic parameters between the tool unit 16 and the operating unit 14. The actuating elements 72, and in particular the two switching elements 74, are arranged near the bearing unit 62. The actuating elements 72, and in particular the two switching elements 74, are configured as sensor elements.

[0056] The actuation element 72 is configured, for example, as an optical sensor element, configured to sense the movement of the impact mechanism housing 26 relative to the main handle housing 18 as a clamping force characteristic parameter. In particular, the movement of the impact mechanism housing 26 relative to the main handle housing 18 is directly proportional to the clamping force that the user can apply to the embedded tool 40 via the main handle 32 and / or the additional handle 34. In particular, an optional switching element 74 is configured to relate to the clamping force characteristic parameter. Specifically, the optional switching element 74 can be configured as a piezoelectric sensor to sense the clamping pressure as a clamping force characteristic parameter, which is directly proportional to the clamping force. In particular, the actuation element 72, and especially the actuation element and / or switching element 74, can be configured to sense the torque on the tool receiving section 38, especially through the power consumption of the electric motor 22, especially the current intensity. The actuation element 72 can, for example, be arranged on the bearing unit 62, especially for sensing the movement of a portion of the bearing unit 62.

[0057] Furthermore, the motor switching unit 66 is configured to switch the electric motor 22 at least partially in relation to the clamping force characteristic parameters.

[0058] The motor switching unit 66 has at least one additional switching element 76 configured to be related to the clamping force characteristic parameter and configured to control and / or regulate the motor speed of the electric motor 22. The additional switching element 76 is configured to control and / or regulate the motor speed of the electric motor 22 within at least one speed range.

[0059] exist Figure 2 The diagram shows the clamping force characteristic parameter curves of the electric motor 22, especially the upper curve, and the corresponding speed curves achieved by the motor switching unit 66, especially the lower curve.

[0060] Plot time on the horizontal axis 78 of the graph. Plot the clamping force characteristic parameters, especially the stroke of relative motion, on the vertical axis 80 of the clamping force characteristic parameter graph. Plot the rotational speed of the electric motor 22 on the vertical axis 90 of the rotational speed graph.

[0061] The motor switching unit 66 is configured to activate the electric motor 22 based on sensed clamping force characteristic parameters, specifically switching the speed of the electric motor 22 to a speed other than zero, specifically an operating speed 86. The motor switching unit 66 is also configured to activate the electric motor 22 when the sensed clamping force characteristic parameters exceed a threshold, specifically an activation threshold 82, specifically switching the speed of the electric motor 22 to an operating speed 86 other than zero (see [link to relevant documentation]). Figure 2(The graph in the figure). In this example, when the activation threshold 82 is exceeded, the motor switching unit 66 switches the speed of the electric motor 22 to a constant, non-zero operating speed 86, such as the maximum possible speed, regardless of further changes in the sensed clamping force characteristic parameters.

[0062] The motor switching unit 66 is configured to assign the activation state 92 of the electric motor 22 to the measurement range of the clamping force characteristic parameter. In particular, the motor switching unit 66 assigns the activation state 92 of the electric motor 22 to the measurement range of the clamping force characteristic parameter above the on-threshold 82.

[0063] The motor switching unit 66 is configured to shut off the electric motor 22 when the sensed clamping force characteristic parameter is below a threshold, particularly a shutdown threshold 84, and in particular to switch the speed of the electric motor 22 to zero speed 88 (see [reference]). Figure 2 (See the graph in the image). In particular, the turn-on threshold 82 and the turn-off threshold 84 are constructed to be the same in this example.

[0064] The motor switching unit 66 is configured to reduce the motor speed of the electric motor 22, especially to a standstill, based on the sensed clamping force characteristic parameters.

[0065] The motor switching unit 66 is configured to reduce the motor speed of the electric motor 22 based on the sensed clamping force characteristic parameters, thereby preventing the shock mechanism from activating.

[0066] The motor switching unit 66 can be configured to passively brake the electric motor 22. The motor switching unit 66 is also configured to actively brake the electric motor 22, especially to brake the electric motor so quickly that the activation of the shock mechanism is avoided.

[0067] exist Figure 3 The diagram shows another clamping force characteristic parameter curve of the electric motor 22, especially the upper curve, and the corresponding speed curve achieved by the motor switching unit 66, especially the lower curve.

[0068] Plot time on the horizontal axis 78 of the graph. Plot the clamping force characteristic parameters, especially the stroke of relative motion, on the vertical axis 94 of the clamping force characteristic parameter graph. Plot the rotational speed of the electric motor 22 on the vertical axis 96 of the rotational speed graph.

[0069] The motor switching unit 66 is configured to activate the electric motor 22 when the sensed clamping force characteristic parameter exceeds a threshold, particularly an activation threshold 82, specifically to switch the speed of the electric motor 22 to an operating speed 86 that is not zero (see [reference]). Figure 2(See the graph in the image). In this example, when the on-threshold 82 is exceeded, the motor switching unit 66 switches the rotational speed of the electric motor 22 to a constant, non-zero operating speed 86, such as the maximum possible speed, regardless of further changes in the sensed clamping force characteristic parameter. The motor switching unit 66 is configured to assign the activation state 92 of the electric motor 22 to the measurement range of the clamping force characteristic parameter. In particular, the motor switching unit 66 assigns the activation state 92 of the electric motor 22 to the measurement range of the clamping force characteristic parameter from the first exceeding of the on-threshold 82 until it falls below the actual off value 100. After a defined time period 98, the actual off value 100 of the clamping force characteristic parameter is not necessarily equal to the off threshold 84. The actual off value 100 is distinguished by a clamping force characteristic parameter difference 102 that is not zero.

[0070] The motor switching unit 66 is configured to switch the electric motor 22 at least partially in a time-dependent manner. The motor switching unit 66 is configured to turn off the electric motor 22 after a defined time period 98, specifically by switching the speed of the electric motor 22 to zero speed 88, when the sensed clamping force characteristic parameter is below a threshold, particularly a shutdown threshold 84 (see [link to relevant documentation]). Figure 2 (See the graph in the image). In particular, the turn-on threshold 82 and the turn-off threshold 84 are constructed to be the same in this example.

[0071] exist Figure 4 The diagram also shows another clamping force characteristic parameter curve of the electric motor 22, especially the upper curve, and the corresponding speed curve reached by the motor switching unit 66, especially the lower curve.

[0072] Plot time on the horizontal axis 78 of the graph. Plot the clamping force characteristic parameters, especially the stroke of relative motion, on the vertical axis 104 of the clamping force characteristic parameter graph. Plot the rotational speed of the electric motor 22 on the vertical axis 106 of the rotational speed graph.

[0073] The motor switching unit 66 is configured to, when the sensed clamping force characteristic parameter exceeds a threshold, particularly an activation threshold 82, activate the electric motor 22 after a defined time period 108, specifically switching the speed of the electric motor 22 to a variable operating speed 114 that is not zero (see [reference]). Figure 4 (The curve in the graph).

[0074] After the defined time period 108, the actual on-time value 110 of the clamping force characteristic parameter is not necessarily equal to the on-time threshold 82. For example, the actual on-time value 110 may have a clamping force characteristic parameter difference 112 that is not zero.

[0075] In this example, when the speed is above the activation threshold 82, the motor switching unit 66 switches the speed of the electric motor 22 to a different operating speed 114, which is different from zero, in relation to further changes in the sensed clamping force characteristic parameter.

[0076] During time period 124, motor switching unit 66 switches the speed of electric motor 22 to intermediate speed 120 in a linearly increasing manner based on the sensed, linearly increasing clamping force characteristic parameter.

[0077] During time period 124, motor switching unit 66 senses a linearly increasing clamping force characteristic parameter, which rises to an intermediate clamping force characteristic parameter 118.

[0078] During time period 126, motor switching unit 66 switches the rotational speed of electric motor 22 to the maximum rotational speed 122 in the active state 92 in a linearly increasing manner based on the sensed, linearly increasing clamping force characteristic parameter. The maximum rotational speed 122 is not mandatory but can correspond to the maximum possible rotational speed of electric motor 22.

[0079] During time period 126, motor switching unit 66 senses a linearly increasing clamping force characteristic parameter, which rises to a maximum clamping force characteristic parameter 116.

[0080] During time period 128, motor switching unit 66 switches the rotational speed of electric motor 22 in a linearly decreasing manner based on the sensed clamping force characteristic parameter, which decreases linearly until it falls below the shutdown threshold 84. In particular, the shutdown threshold 84 is configured to be related to the maximum value of the clamping force characteristic parameter, especially to the maximum clamping force characteristic parameter 116, for example, as a percentage, such as approximately 75% of that maximum value. In this way, the shutdown limit value can be above the on limit value.

[0081] The motor switching unit 66 is configured to shut off the electric motor 22 when the sensed clamping force characteristic parameter is below a threshold, particularly a shutdown threshold 84, and in particular to switch the speed of the electric motor 22 to zero speed 88 (see [reference]). Figure 2 (The curve in the graph).

[0082] The motor switching unit 66 is configured to assign the activation state 92 of the electric motor 22 to the measurement range of the clamping force characteristic parameter. Specifically, the motor switching unit 66 assigns the activation state 92 of the electric motor 22 to the measurement range of the clamping force characteristic parameter from the initial exceeding the actual on-state value 110 to below the off-state threshold 84. In particular, the motor switching unit 66 assigns the activation state 92 of the electric motor 22 to the measurement range of the clamping force characteristic parameter from the initial exceeding the on-state threshold 82, especially the actual on-state value 110, to below the off-state threshold 84, especially the actual off-state value 100.

[0083] In particular, the turn-on threshold 82 and the turn-off threshold 84 are constructed differently in this example.

[0084] exist Figure 5 The graphs show the torque characteristic parameter curves (top curve), the clamping force characteristic parameter curve (middle curve), and the standby switch status curve or the motor switching unit curve (bottom curve).

[0085] In this example, the motor switching unit 66 is configured to switch the electric motor 22 at least in part with respect to torque.

[0086] Plot time on the horizontal axis 130 of the graph. Plot torque characteristic parameters, especially current intensity, on the vertical axis 132 of the torque characteristic parameter graph. Plot clamping force characteristic parameters on the vertical axis 134 of the clamping force characteristic parameter graph. Plot switch states, especially on state 140 or off state 142, on the vertical axis 136 of the standby switch state graph or motor switching unit graph.

[0087] During time period 138, the standby switch 68 or the motor switching unit 66, especially the switching element 74 of the motor switching unit 66, is in the ON state 140. Outside of time period 138, the standby switch 68 or the motor switching unit 66, especially the switching element 74 of the motor switching unit 66, is in the OFF state 142.

[0088] During time period 144, the motor switching unit 66 senses a clamping force characteristic parameter value 146 that is different from zero. During time period 154, the motor switching unit 66 senses a zero clamping force characteristic parameter 148.

[0089] During time period 150, the torque characteristic parameter on the tool receiving unit 38, especially on the electric motor 22, particularly the current consumption, particularly as the current intensity, is sensed as a torque characteristic parameter value 158 that is different from zero. This torque characteristic parameter value is particularly related to the working load torque. This torque characteristic parameter value corresponds to the clamping force characteristic parameter value 146, and particularly corresponds to the working state of the handheld machine tool 10 on the workpiece.

[0090] During time period 152, the torque characteristic parameter on the tool receiving section 38, especially on the electric motor 22, particularly the current consumption, particularly as the current intensity decreases to the torque characteristic parameter value 156, which is particularly related to the cuttings conveying torque, and this torque characteristic parameter value corresponds to the clamping force characteristic parameter 146, and particularly to the working state of the handheld machine tool 10 on the workpiece.

[0091] During time period 160, the torque characteristic parameter on the tool receiving unit 38, especially on the electric motor 22, particularly the current consumption, particularly as the current intensity, is sensed as a torque characteristic parameter value 156 that is different from zero. This torque characteristic parameter value is particularly related to the working load torque. This torque characteristic parameter value corresponds to the zero clamping force characteristic parameter value 148, particularly to the working state of the handheld machine tool 10 on the workpiece.

[0092] During time period 162, the torque characteristic parameter on the tool receiving section 38, especially on the electric motor 22, particularly the current consumption, particularly the current intensity, drops to a zero torque characteristic parameter value 164. This zero torque characteristic parameter value is particularly relevant to the unloaded handheld machine tool 10. This zero torque characteristic parameter value corresponds to the zero clamping force characteristic parameter 148, particularly to the closed state of the handheld machine tool 10 or to the working state of the handheld machine tool 10 without load caused by the workpiece or drill chips.

[0093] During time period 162, the torque characteristic parameter reaches below the torque characteristic parameter threshold 166. The motor switching unit 66 is configured to brake the electric motor 22 to zero speed 88 when the torque characteristic parameter is below the threshold 166. The standby switch 68 can be configured to switch to the off state 142 and, in particular, interrupt the current supply to the electric motor 22 when the torque characteristic parameter is below the threshold 166. Specifically, the motor switching unit 66 and the standby switch 68 can be mechanically and / or electrically connected.

[0094] In particular, the handheld machine tool 10 can have a structure without an impact mechanism control device. In particular, the pneumatic impact mechanism 20 can be controlled by the motor switching unit 66.

[0095] The standby switch 68 is in the ON state 140, especially in the standby state. The standby switch 68 is in the OFF state 142, especially in the safety state.

Claims

1. Hand-held power tool having at least one electric motor (22), having a tool unit (16) and at least one operating unit (14) and having a motor switching unit (66) which is configured for sensing a pressing force characteristic variable between the tool unit (16) and the operating unit (14), characterized in that, The motor switching unit (66) is configured to switch on the electric motor (22) after a defined period of time (108) if the sensed compression force characteristic variable exceeds an on threshold (82), the motor switching unit (66) being configured to switch the electric motor (22) at least partially in relation to torque in such a way that the electric motor (22) is braked to zero rotational speed (88) and / or the current supply to the electric motor (22) is interrupted if a torque characteristic variable is below a torque characteristic variable threshold (166).

2. The hand-held power tool as claimed in claim 1, characterized in that The hand-held power tool is an electric pick, a drill hammer and / or a chisel hammer.

3. The hand-held power tool as claimed in claim 1, characterized in that The hand-held power tool has a pneumatic percussion mechanism (20) and a tool receptacle (38) for receiving an insert tool (40), wherein the insert tool (40) can be driven along a working axis (54), and wherein the motor switching unit (66) is configured to reduce the motor rotational speed of the electric motor (22) on the basis of a sensed compression force characteristic variable.

4. The hand-held power tool according to claim 3, characterized in that The motor switching unit (66) is configured to reduce the motor rotational speed of the electric motor (22) to a standstill on the basis of a sensed compression force characteristic variable.

5. The hand-held power tool according to any one of claims 1 to 4, characterized by, The hand-held power tool has a pneumatic percussion mechanism (20) and a tool receptacle (38) for receiving an insert tool (40), wherein the insert tool (40) can be driven along a working axis (54), and wherein the motor switching unit (66) is configured to reduce the motor rotational speed of the electric motor (22) on the basis of a sensed compression force characteristic variable.

6. The hand-held power tool according to any one of claims 1 to 4, characterized by The motor switching unit (66) is configured to reduce the motor rotational speed of the electric motor (22) to a standstill on the basis of a sensed compression force characteristic variable.

7. The hand-held power tool according to any one of claims 1 to 4, characterized by The hand-held power tool has a pneumatic percussion mechanism (20) and a tool receptacle (38) for receiving an insert tool (40), wherein the insert tool (40) can be driven along a working axis (54), and wherein the motor switching unit (66) is configured to reduce the motor rotational speed of the electric motor (22) on the basis of a sensed compression force characteristic variable.

8. The hand-held power tool according to any one of claims 1 to 4, characterized by, The motor switching unit (66) is configured to brake the electric motor (22) passively and / or actively.

9. The hand-held power tool according to any one of claims 1 to 4, characterized by, The tool unit (16) is at least partially formed by a percussion mechanism housing (26).

10. The hand-held power tool according to any one of claims 1 to 4, characterized by, The operating unit (14) is at least partially formed by a main handle housing (18).

11. The hand-held power tool according to any one of claims 1 to 4, characterized by The motor switching unit (66) is configured to assign an activation state (92) of the electric motor (22) to a measurement range of the compression force characteristic variable.

12. The hand-held power tool according to any one of claims 1 to 4, characterized by The motor switching unit (66) is configured to switch the electric motor (22) at least partially in relation to time.

13. The hand-held power tool according to any one of claims 1 to 4, characterized by The hand-held power tool has a cover unit (12), wherein the motor switching unit (66) has at least one operating element (72) which is completely covered by the cover unit (12).

14. The hand-held power tool according to claim 13, characterized by The motor switching unit (66) has at least one switching element (76) which is configured in relation to the compression force characteristic variable and which is configured to control and / or regulate the motor rotational speed of the electric motor (22) in at least one rotational speed range.

15. The hand-held power tool of claim 13, characterized by The hand-held power tool has at least one emergency switch (68) which is configured to switch the electric motor (22) into an emergency state or from an emergency state into a safety state.

16. The hand-held power tool according to any one of claims 1 to 4, characterized by The emergency state is a rotational speed-free state. The at least one emergency switch (68) is configured as a contact switch and / or a signal switch. The hand-held power tool has a configuration without a percussion mechanism control device.

17. The hand-held power tool according to any one of claims 1 to 4, characterized by The hammer tube (46) is configured without a closable opening, and / or has at least one impact mechanism housing (26) and at least one impact bolt (48) which is at least substantially immovably supported in the impact mechanism housing (26) in an impact direction (52).

18. The hand-held power tool according to claim 17, characterized by The hammer tube (46) is a guide tube.

19. The hand-held power tool of claim 17, characterized by The opening is a control opening or an idling opening.

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