Hand-Held Power Tool

Abstract

A hand-held power tool includes a housing in which a drive unit and an impact-mechanism unit are arranged. The hand-held power tool further includes a tool-receiver interface configured to releasably connect with a tool receiver, the tool receiver configured as a stirrer-basket receiver. A user interface is configured to set at least one of a rotary-hammer mode and a stirring mode for the hand-held power tool.

Claims

1. A hand-held power tool, comprising: a housing in which a drive unit and an impact-mechanism unit are arranged; a tool-receiver interface configured to releasably connect with a tool receiver, the tool receiver configured as a stirrer-basket receiver; and a user interface configured to set at least one of a rotary-hammer mode and a stirring mode.

2. The hand-held power tool according to claim 1, wherein the user interface is further configured to set an idling rotational speed of the hand-held power tool to a first value.

3. The hand-held power tool according to claim 2, wherein the user interface is further configured to set the idling rotational speed of the hand-held power tool to a second value, the second value different from the first value.

4. The hand-held power tool according to claim 1, wherein the user interface is further configured to set a working rotational speed of the hand-held power tool to a first value.

5. The hand-held power tool according to claim 4, wherein the user interface is further configured to set the working rotational speed of the hand-held power tool to a second value, the second value different from the first value.

6. The hand-held power tool according to claim 1, further comprising: a battery interface configured to connect to a battery pack.

7. The hand-held power tool according to claim 1, further comprising: a communication unit configured to communicate with an external device.

8. The hand-held power tool according to claim 7, wherein the communication unit is configured to communicate wirelessly with the external device.

9. The hand-held power tool according to claim 7, wherein the user interface comprises an input unit via which the user interface can be set, the input unit arranged on one of the housing of the hand-held power tool and the external device.

10. The hand-held power tool according to claim 1, the user interface further comprising: a detection unit configured to sense at least one of the tool receiver and an insert tool received in the tool receiver.

11. The hand-held power tool according to claim 1, wherein the stirrer-basket receiver includes a screw thread configured to connect to a stirrer basket.

12. The hand-held power tool according to claim 1, further comprising: the tool receiver; and an impact-mechanism control configured such that connection of the tool receiver configured as a stirrer-basket receiver with the tool-receiver interface disables the impact-mechanism control such that the impact-mechanism control cannot be activated.

13. A rotary hammer, comprising: a housing in which a drive unit and a pneumatic impact-mechanism unit are arranged; a tool receiver configured to releasably receive an insert tool, the tool receiver configured as a stirrer-basket receiver; and a tool-receiver interface configured to releasably connect with the tool receiver.

14. The rotary hammer according to claim 13, further comprising: an impact-mechanism control configured such that connection of the tool receiver configured as a stirrer-basket with the tool-receiver interface disables the impact-mechanism control such that the impact-mechanism control cannot be activated.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Further advantages are evident from the following description of the drawings. The drawings, the description and the claims contain numerous features in combination. Persons skilled in the art will also expediently consider the features individually and combine them to form appropriate further combinations.

[0021] There are shown:

[0022] FIG. 1 a side view of a hand-held power tool;

[0023] FIG. 2 a longitudinal section through an SDS-plus interchangeable chuck;

[0024] FIG. 3 a longitudinal section through a stirrer-basket receiver; and

[0025] FIG. 4 a longitudinal section through a stirrer basket that is connected to a stirrer-basket receiver.

DETAILED DESCRIPTION

[0026] FIG. 1 shows a side view of a hand-held power tool 10 in the form of a rotary hammer 12. The hand-held power tool 10 has a housing 13 that comprises an outer housing 14 and an inner housing (not represented). Arranged in the housing 13 of the hand-held power tool 10 is a drive unit 20, which comprises an electric motor 18 and which transmits a drive motion to a transmission unit 22 that has an impact mechanism 24. The impact mechanism 24 is realized, exemplarily, as a pneumatic impact mechanism.

[0027] The inner housing has a motor housing (not represented) and a transmission housing 23, which are enclosed by the outer housing 14. The transmission housing 23 accommodates the impact mechanism 24, in particular the transmission unit 22, substantially completely. The transmission housing 23 at least partially spans a grease chamber in which there is arranged a lubricant for lubricating the transmission unit 22. The motor housing is designed, in particular, to accommodate and/or support the electric motor 18. The transmission housing 23 is made, for example, of a material different from that of the rest of the outer housing 14. For example, the transmission housing 23 is made of a metallic material, while the motor housing and the outer housing 14 are made of a plastic. It is equally conceivable, however, for the transmission housing 23 to be made of a plastic. In particular, the transmission housing 23 and/or the motor housing have/has a higher strength and/or temperature resistance than the outer housing 14.

[0028] Via the transmission unit 22, the drive motion of the drive unit 20 is transmitted to a tool receiver 100 in which an insert tool 26 is releasably fastened. The insert tool is realized as a rock drill-bit for drilling holes in concrete. The insert tool 26 is designed to be driven in rotation about and/or in a linearly oscillating or percussive manner along a working axis 29. In addition, the insert tool 26 may be driven in clockwise or anticlockwise rotation. The working axis 29 extends, by way of example, in an intersecting manner, in particular substantially perpendicularly, in relation to a motor axis 17 of the drive unit 20.

[0029] The hand-held power tool 10 has a handle 30. The handle extends substantially perpendicularly in relation to the working axis 29. The handle 30 is arranged on a side of the housing 13 that faces away from the tool receiver 100. The handle 30 has an operating switch 32, via which the hand-held power tool 10 can be controlled manually, or can be switched on and off. The operating switch 32 is realized, exemplarily, as a signal switch. The handle 30 is realized, exemplarily, as a vibration-decoupled handle 30. In particular, the handle 30 is connected to the housing 13 of the hand-held power tool 10 via a damping unit 31. The handle 30 is connected to the housing 13 so as to be movable relative to the latter. Furthermore, the hand-held power tool 10 has an ancillary handle 33, which is releasably connected to the housing 13.

[0030] The hand-held power tool 10 is realized as a battery-powered hand-held power tool. By way of example, the hand-held power tool 10 has a battery interface 36, via which a battery pack 38 is electrically and mechanically connected to the hand-held power tool 10 so as to be releasable without use of tools. The battery pack 38 is arranged on a front side of the hand-held power tool 10 that faces towards the tool receiver 100. The battery pack 38 has a battery pack housing 40, in which battery cells (not represented) are arranged in three layers, each layer having, for example, five battery cells. Due to the number of layers, the battery pack 38 has a height perpendicular to the stacked layers that is greater than a width of the battery pack 38.

[0031] The tool receiver 100 is in particular designed as an interchangeable chuck 102. The interchangeable chuck 102 is releasably connected to the hand-held power tool 10 via a tool-receiver interface 104. Such tool-receiver interfaces 104 are known to persons skilled in the art and are described in various embodiments, and are available on the market. The tool receiver 100 in the form of the interchangeable chuck 102 is connected via a force-fit and/or form-fit connection, which is designed to be releasable by the user of the hand-held power tool 10. Depending on the design of the interchangeable chuck 102, the connection may be designed to be releasable without use of tools or releasable by means of a tool (not represented).

[0032] The interchangeable chuck 102 represented in FIG. 1 is realized as an SDS-plus interchangeable chuck 106, and in FIG. 2 is shown in a longitudinal section when having been connected to the hand-held power tool 10. An SDS-plus interchangeable chuck 106 is to be understood to be an interchangeable chuck 102 that is designed to receive, or releasably fasten, an insert tool 26 having an SDS-plus insertion end 28.

[0033] The impact mechanism 24 of the hand-held power tool 10 has a guide tube 25 realized as a hammer tube (see FIG. 2a), in which a piston (not represented) driven by an eccentric unit is guided for linear movement. The piston is designed to drive a striker (not represented) and a percussion pin 27 (see FIG. 2a), which is also mounted in a linearly movable manner in the guide tube 25. During the striking operation of the hand-held power tool 10, an air spring is formed between the striker and the piston. The impact mechanism 24 has an impact mechanism control, not represented further, via which the impact mechanism can be activated. The impact mechanism control is realized mechanically by means of closable ventilation openings in the guide tube 25, the impact mechanism control being effected by means of the percussion pin 27. The tool receiver 100, in particular the SDS-Plus interchangeable chuck 106, is realized in such a manner that the received insert tool 26, realized as a rock drill-bit, acts upon the percussion pin 27 with a force that displaces the percussion pin 27 into the guide tube 25. The displacement of the percussion pin 27 causes a vent of the guide tube 25 to be closed, such that, during operation, an air spring is created and the insertion tool 26 is driven in a linearly oscillating manner.

[0034] The hand-held power tool 10 additionally has a set of electronics 42 that is designed to control the hand-held power tool 10 by open-loop or closed-loop control. The set of electronics 42 comprises a printed circuit board comprising a computing unit in the form of a CPU, and a storage unit. The set of electronics 42 additionally comprises a plurality of sensor elements by means of which information on the state of the hand-held power tool 10 can be sensed. For example, the hand-held power tool 10 comprises a motion sensor in the form of an acceleration sensor. The acceleration sensor may be designed, for example, to distinguish an impact operating mode, or operation under load from an idling operation. It is also conceivable for the motion sensor to be design to sense and determine the orientation and position of the hand-held power tool 10 in space, or to sense and determine a rotation of the housing 13 of the hand-held power tool 10 about the working axis 29, for example in the case of impingement on a reinforcement. The sensed information of the motion sensor is provided to the set of electronics 42, which controls the drive unit 20 on the basis of the information.

[0035] The control may be effected, for example, by control of the working rotational speed or load rotational speed, or by a switch-off or active braking of the drive unit. The hand-held power tool 10 additionally comprises a rotational-speed sensor and a current sensor. The rotational-speed sensor is assigned to a rotational-speed monitoring unit. The rotational-speed sensor is realized, for example, as a Hall sensor. The current sensor is assigned to a torque monitoring unit. Thus, the rotational speed of the hand-held power tool 10 can be determined and sensed both in operation under load and in idling operation, and can be controlled by open-loop or closed-loop control via the set of electronics 42.

[0036] In idling operation, the insert tool 26 in this case is driven at an idling rotational speed, with the insert tool 26 not being under load. This means that no work process, such as hole drilling or a screwing process or a stirring process, is taking place. In operation under load, the insert tool 26 is driven at a load rotational speed, with the insert tool being under load. The power consumption of the hand-held power tool 10 is in particular higher in operation under load than in idling operation. In operation under load, the insert tool 26 is used for hole drilling, screwing, stirring, etc.

[0037] The set of electronics 42 comprise a communication unit 44 designed for wireless communication with an external device such as, for example, a smartphone. The wireless communication is effected, for example, via a Bluetooth connection. In particular, this allows the hand-held power tool 10 to be at least partially controlled via the external device.

[0038] The hand-held power tool 10 additionally comprises a user interface 46. The user interface 46 comprises a screen, not represented further, and input elements, not represented further. Operating information or information on the state of the hand-held power tool can be displayed via the screen of the user interface 46. The display of the screen, and/or the set of electronics 42 and thus the hand-held power tool 10, can be set via the input via the input elements of the user interface 46.

[0039] Another tool receiver 100, which is realized as a stirrer-basket receiver 110, is shown in a longitudinal section in FIG. 3. The stirrer-basket receiver 110 is likewise realized as an interchangeable chuck 102.

[0040] The stirrer-basket receiver 110 has an insert-tool interface 112 for releasable connection to an insert tool 26 realized as a stirrer basket 114. The insert-tool interface 112 is realized as an internal thread 113, for example as an M14 thread. The stirrer-basket receiver 110 additionally comprises a hand-held power tool interface 116 for releasable connection to the tool-receiver interface 104 of the hand-held power tool 10. The hand-held power tool interface 116 is preferably substantially identical in design to a hand-held power tool interface of the previously described SDS-plus interchangeable chuck 106. The insert-tool interface 112 and the hand-held power tool interface 116 are arranged on opposite sides of the stirrer-basket receiver 110.

[0041] Via the tool-receiver interface 104, the hand-held power tool 10 may be connected to different tool receivers 100 such as, for example, the SDS-plus interchangeable chuck 106 or the stirrer-basket receiver 110. A further tool receiver 100, not represented, is a clamping-jaw interchangeable chuck that is designed for receiving a round-shank drill bit.

[0042] FIG. 4 shows a section through the hand-held power tool 10, the hand-held power tool 10 being connected to the stirrer-basket receiver 110 and a stirrer basket 114 being connected to the stirrer-basket receiver 110. The stirrer basket 114 has an M14 external thread 118 in the region of an insertion end 120, which is designed so as to correspond to the insert-tool interface 112 of the stirrer-basket receiver 110. The insert-tool interface 112 is realized in such a manner that the mechanical impact mechanism control is not activated. In particular and exemplarily, the insertion end 120 of the stirrer basket 114 is received at a distance from the percussion pin 27, so that the impact mechanism control is not actuated to activate the impact mechanism 24. It can thus be ensured that the stirrer basket 114 executes a purely rotating motion and not a linear oscillating motion.

[0043] For operation of the hand-held power tool 10 with an SDS-plus interchangeable chuck 106, which is normally used for drilling or chiseling, settings of the hand-held power tool 10 other than those used in operation of the hand-held power tool 10 with a stirrer-basket receiver 110, which is normally used for stirring, may be advantageous.

[0044] A rotary-hammer mode and a stirring mode can therefore be set via the user interface 46. The user interface 46 may have a plurality of rotary-hammer modes and/or a plurality of stirring modes for the user to choose between. The mode may be set, for example, via the operating elements of the user interface 46 on the hand-held power tool 10 or via an app on the smartphone. The rotary-hammer mode and the stirring mode differ, in particular, in a working rotational speed and/or an idling rotational speed. Preferably, different values for a parameter may be set in the stirring mode than in the rotary-hammer mode. For example, the working rotational speed or the idling rotational speed may be set to a different rotational speed in stirring mode than in rotary-hammer mode. In addition, different parameters may be set in stirring mode than in rotary-hammer mode. An example of this would be a stirring time for which the hand-held power tool 10 is operated in the stirring mode, and in which the hand-held power tool may be locked, for example, so that the user does not need to have the operation switch 32 constantly pressed. In this embodiment, the user must select the mode. It would also be conceivable, however, for the tool receiver 100 or the insert tool 26 to be recognized by the hand-held power tool 10 or the external device and for the settings to be effected at least partially automatically.