Tool basic module

Abstract

A tool basic module for use with at least one attachment device includes a drive unit, a main output shaft having a shaft receptacle for at least partially receiving a main input shaft of the attachment device, and a coupling device, which has a mechanical interface for mechanically connecting the attachment device to the main output shaft with respect to driving and an electrical interface for transferring electric power and/or an electric current. The mechanical interface is at least in particular substantially cylindrical and has a plurality of interlocking connection elements, which in particular are uniformly arranged on an outer periphery of the mechanical interface and are provided for torque support of the attachment device.

Claims

1. A tool basic module for use with at least one attachment device, said tool basic module comprising: a drive unit; a main output shaft having a shaft receptacle configured to at least in part receive a main input shaft of the attachment device; and a coupling device including: a mechanical interface on the main output shaft configured to mechanically link to the attachment device in terms of drive technology; and an electrical interface configured to transmit at least one of an electric output and an electric current to the attachment device, wherein the mechanical interface is at least substantially cylindrical and has a plurality of form-fitting elements disposed uniformly on an external circumference of the mechanical interface, the form-fitting elements configured to support a torque of the attachment device, and wherein all interface elements of the mechanical interface and of the electrical interface are at least in part disposed in a plane that intersects the shaft receptacle and runs at least substantially perpendicular to the main output shaft.

2. The tool basic module as claimed in claim 1, wherein the plurality of form-fitting elements includes three form-fitting elements disposed offset from one another by 120° on the external circumference of the mechanical interface.

3. The tool basic module as claimed in claim 1, wherein the mechanical interface has at least one end face extending at least substantially perpendicular to the main output shaft, the at least one end face defining a plurality of locking openings configured to receive locking hooks of the attachment device.

4. The tool basic module as claimed in claim 1, wherein the mechanical interface has at least one end face extending at least substantially perpendicular to the main output shaft, the at least one end face defining three locking openings offset from one another by 90° about the main output shaft.

5. The tool basic module as claimed in claim 1, wherein the mechanical interface has at least one end face extending at least substantially perpendicular to the main output shaft, wherein all interface elements of the mechanical interface and/or of the electrical interface and/or the shaft receptacle terminate so as to be at least substantially flush with the end face.

6. The tool basic module as claimed in claim 1, wherein the shaft receptacle defines a receptacle clearance extending along a direction of main extent of the main output shaft and which has a diameter of at most 7 mm.

7. The tool basic module as claimed in claim 1, wherein the coupling device defines at least one material clearance extending along an assembling direction and configured to receive a material protrusion of the attachment device during assembly of the attachment device.

8. A tool basic module for use with at least one attachment device, said tool basic module comprising: a drive unit; a main output shaft having a shaft receptacle configured to at least in part receive a main input shaft of the attachment device; and a coupling device including: a mechanical interface on the main output shaft configured to mechanically link to the attachment device in terms of drive technology; and an electrical interface configured to transmit at least one of an electric output and an electric current to the attachment device, wherein the mechanical interface is at least substantially cylindrical and has a plurality of form-fitting elements disposed uniformly on an external circumference of the mechanical interface, the form-fitting elements configured to support a torque of the attachment device, and wherein the electrical interface includes two output contact sockets of identical type configured to transmit a high electric output of at least 20 W and/or a high electric current of at least 2 A, and a signal contact socket configured to transmit a low electric output of at most 4 W and/or a low electric current of at most 1 A.

9. The tool basic module as claimed in claim 8, wherein all interface elements of the mechanical interface and of the electrical interface are at least in part disposed in a plane that intersects the shaft receptacle and runs at least substantially perpendicular to the main output shaft.

10. The tool basic module as claimed in claim 8, wherein the signal contact socket is disposed between the two output contact sockets and is oriented at least substantially perpendicular to said two output contact sockets.

11. An attachment device for use with a tool basic module, said attachment device comprising: an operational output; a main input shaft; and a coupling device including: a mechanical interface on a main input shaft configured to mechanically linking the main input shaft in terms of drive technology to a main output shaft of the tool basic module; and an electrical interface configured to electrically couple to an electrical interface of the tool basic module, wherein the mechanical interface is at least substantially annular and has a plurality of form-fitting elements disposed uniformly on an internal circumference of the mechanical interface and are provided for torque support on a mechanical interface of the tool basic module, wherein the electrical interface has two output plug contacts configured to transmit a high electric output of at least 20 W and/or a high electric current of at least 2 A, and a signal plug contact configured to transmit a low electric output of at most 4 W and/or a low electric current of at most 1 A, and wherein the signal plug contact is disposed between the two output plug contacts and is oriented at least substantially perpendicular to said two output plug contacts.

12. The attachment device as claimed in claim 11, wherein the plurality of form-fitting elements includes three form-fitting elements disposed offset from one other by 120° on an internal circumference of the mechanical interface.

13. The attachment device as claimed in claim 11, wherein the mechanical interface has a plurality of locking hooks configured to engage in locking openings of the mechanical interface of the tool basic module.

14. The attachment device as claimed in claim 11, wherein the mechanical interface has three locking hooks disposed offset from one another by 90° about the main input shaft.

15. The attachment device as claimed in claim 11, wherein the coupling device has at least one material protrusion extending along an assembling direction and configured to engage in a material clearance of the tool basic module during assembly.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) Further advantages are derived from the following description of the drawings. An exemplary embodiment of the disclosure is illustrated in the drawings. The drawings, the description, and the claims include numerous features in combination. The person skilled in the art will expediently also consider the features individually and combine said features so as to form further meaningful combinations.

(2) In the drawings:

(3) FIG. 1 shows a view of a hand-held power tool system having a tool basic module and an attachment device;

(4) FIG. 2 shows a perspective view of the tool basic module without an attachment device;

(5) FIG. 3 shows a lateral view of the tool basic module without an attachment device;

(6) FIG. 4 shows a perspective view of the attachment device;

(7) FIG. 5 shows a rear view of the attachment device; and

(8) FIG. 6 shows a rear view of the attachment device in the opened state.

DETAILED DESCRIPTION

(9) FIG. 1 shows a hand-held power tool system 88 having a tool basic module 10 and having an attachment device 12 which is provided for mechanically linking in terms of drive technology and/or electrically linking to the tool basic module 10. The tool basic module 10, conjointly with the attachment device 12 coupled to the tool basic module 10, is provided for configuring a fully functional hand-held power tool. The tool basic module 10 is provided exclusively for use with at least one attachment device 12 and thus is not provided for a stand-alone use.

(10) The tool basic module 10 has a drive unit 14. The drive unit 14 is configured as an electric motor. The tool basic module 10 has a housing 90 which in an assembled state mounts the drive unit 14 and protects the latter from environmental influences such as dust, moisture, radiation, and/or shocks. The tool basic module 10 has a main operating direction 92. The housing 90 of the tool basic module 10 in the present exemplary embodiment is configured in the shape of a pistol. The housing 90 at an end oriented counter to the main operating direction 92 has a handle 94. The handle 94 in a use of the hand-held power tool system 88 is provided for being gripped by a hand of a user. The tool basic module 10 has a mass of less than 500 g. The tool basic module 10 has a mass of at least substantially 300 g.

(11) The tool basic module 10 has a power supply 96. The power supply 96 in the present exemplary embodiment comprises an electric power accumulator. The electric power accumulator in the present exemplary embodiment is configured as a rechargeable battery. The electric power accumulator in the present exemplary embodiment is configured as a lithium-ion battery. The hand-held power tool system 88 comprises a charging unit (not illustrated in more detail) which is connectable to a mains supply and which is provided for charging the electric energy accumulator. Alternatively, the power supply 96 can be provided for connecting the drive unit 14 directly to a mains supply. It is also conceivable for the power supply to have a receptacle for single-use batteries as energy accumulators.

(12) The tool basic module 10 comprises a main switch 98 which is provided for switching on, switching off the drive unit 14, and/or setting a rotating speed and/or a torque of the drive unit 14. The tool basic module 10 furthermore comprises a mode selector switch 100 which is provided for setting an operating mode, for example a rotation direction, a torque, a rotating speed, and/or a soft start or the like of the drive unit 14.

(13) FIG. 2 shows a perspective view of the tool basic module 10 without the attachment device 12. FIG. 3 shows a lateral view of the tool basic module 10 without the attachment device 12. The tool basic module 10 comprises a coupling device 22 which for mechanically linking in terms of drive technology the attachment device 12 has a mechanical interface 24 on the main output shaft 16. The attachment device 12 has a mechanical interface 70 that corresponds to the mechanical interface 24 (cf. FIG. 4). The tool basic module 10 furthermore has a main output shaft 16 having a shaft receptacle 18. The shaft receptacle 18 is preferably configured so as to be integral to a main output shaft 16 of the tool basic module 10. The coupling device 22 has at least one material clearance 60 which extends along an assembling direction and which while assembling the attachment device 12 is provided for receiving a material protrusion 62 of the attachment device 12. The material clearance 60 has a geometry that is complementary to the material protrusion 62 of the attachment device 12. The material clearance 60 in combination with the material protrusion 62 serves as an orientation aid for aligning the attachment device 12 relative to the tool basic module 10 when assembling the attachment device 12 on the tool basic module 10.

(14) The tool basic module 10 can be used as a hand-held power tool exclusively in conjunction with the attachment device 12. The tool basic module 10 per se cannot be used without an attachment device 12. The drive unit 14 in at least one operating state drives the main output shaft 16 having a shaft receptacle 18 in particular exclusively in the case of a coupled attachment device 12. The shaft receptacle 18 has a receptacle clearance 52 which extends along the direction of main extent 50 of the main output shaft 16 and which has a diameter of at most 7 mm. The receptacle clearance 52 has an at least substantially circular cross-section having a diameter of at most 7 mm. The receptacle clearance 52 has in particular a plurality of entrainment elements 114 which are disposed on an internal circumference of the receptacle clearance 52 and are provided for transmitting a torque and/or a rotating movement from the shaft receptacle 18 to a main input shaft 66 of the attachment device. The entrainment elements 114 in the present exemplary embodiment are configured as entrainment webs which are disposed uniformly on an internal circumference of the receptacle clearance 52. The shaft receptacle has in particular at least six entrainment elements 114. The tool basic module 10 in the present exemplary embodiment has a gearbox unit 102 which is provided for converting a torque and/or a rotating movement of the drive unit 14 to a torque and/or a rotating movement of the main output shaft 16. The gearbox unit 102 can have a fixedly set transmission ratio. Alternatively, it is conceivable for the gearbox unit 102 to be configured so as to be switchable. The drive unit 14 in at least one operating state provides a torque at shaft receptacle 18. The tool basic module 10 is provided so as to be manually held when in use. The tool basic module 10 has a handle 94. The handle 94 is configured so as to be integral to the housing 90 of the tool basic module 10.

(15) The mechanical interface 24 is configured so as to be at least in particular substantially cylindrical, and has a plurality of form-fitting elements 28, 30, 32 which are disposed in particular uniformly on an external circumference of the mechanical interface 24 and are provided for torque support of the attachment device 12. The form-fitting elements 28, 30, 32 of the mechanical interface 24 of the tool basic module 10 for torque support are provided in particular for interacting with corresponding form-fitting elements 74, 76, 78 of the attachment device 12. The form-fitting elements 28, 30, can in particular be incorporated as material clearances and/or recesses in a shell face 112 of the mechanical interface 24, as material protrusions on a shell face 112 of the mechanical interface 24, and/or be configured as flattenings of a shell face 112 of the mechanical interface 24. The mechanical interface 24 in the present exemplary embodiment has three form-fitting elements 28, 30, 32 which are disposed so as to be in each case offset by 120° on the external circumference of the mechanical interface 24. In the present exemplary embodiment, the mechanical interface 24 has two form-fitting elements 28, 30 of identical type, which are configured as material clearances or recesses in the shell face 112 of the mechanical interface 24. The two form-fitting elements 28, 30 of identical type have an at least substantially triangular cross-section. The two form-fitting elements 28, 30 of identical type are provided for receiving two form-fitting elements 74, 76 of the attachment device 12 that are configured in a corresponding manner. The mechanical interface 24 furthermore has one form-fitting element 32 that is configured as a flattening of the shell face 112 of the mechanical interface 24. In particular, the form-fitting element 32 configured as a flattening is provided for bearing on a planar form-fitting element 78 of the attachment device 12 that is configured in a corresponding manner.

(16) The mechanical interface 24 has an end face 34 which runs so as to be at least substantially perpendicular to the main output shaft 16 and in which a plurality of locking openings 36, 38, 40 which are provided for receiving locking hooks 42, 44, 46 of the attachment device 12 are disposed. The mechanical interface 24 in the present exemplary embodiment has an end face 34 which runs so as to be substantially perpendicular to the main output shaft 16 and in which three locking openings 36, 38, 40 which are disposed so as to be in each case offset by 90° about the main output shaft 16 are disposed. All interface elements of the mechanical interface 24, of the electrical interface 26, and the shaft receptacle 18 terminate so as to be at least substantially flush with the end face 34. All interface elements of the mechanical interface 24 and of the electrical interface 26 are at least in part disposed in a plane 48 which intersects the shaft receptacle 18 and which runs so as to be at least substantially perpendicular to the main output shaft 16.

(17) The mechanical interface 24 has a diameter 108 which is smaller in comparison to a maximum diameter 110 of a part of the housing 90 of the tool basic module 10 that extends along the direction of main extent 50 of the main output shaft 16. The mechanical interface 24 has in particular a diameter 108 which is smaller by at least 2 mm, preferably at least 5 mm, and preferably at least 8 mm than the maximum diameter 110 of the part of the housing 90 of the tool basic module 10 that extends along the direction of main extent 50 of the main output shaft 16. The part of the housing 90 of the tool basic module 10 that extends along the direction of main extent 50 of the main output shaft 16 has in particular a maximum diameter 110 of at least substantially 40 mm, preferably of at least substantially 45 mm, and preferably of at least substantially 50 mm. The mechanical interface 24 has in particular a diameter 108 of at least substantially 35 mm, preferably of at least substantially 40 mm, and preferably of at least substantially 45 mm.

(18) The electrical interface 26 is provided for electrically linking the attachment device 12 on the tool basic module 10, in a manner coupled to the mechanical linking. In the present exemplary embodiment the hand-held power tool system 88 has an attachment device 12 which in an exemplary manner is configured as a screwdriver attachment. It is conceivable for the hand-held power tool system 88 to comprise further attachment devices of further types.

(19) The electrical interface 26 for transmitting a high electric output and/or a high electric current has two output contact sockets 54, 56 of identical type, and for transmitting a low electric output and/or a low electric current has a signal contact socket 58. The output contact sockets are provided for transmitting an electric output from the tool basic module 10 to the attachment device 12. The output contact sockets 54, 56 are provided for transmitting a current of at least 20 A. The output contact sockets 54, 56 are provided for transmitting an output of at least 100 Watts. It is conceivable for the output contact sockets 54, 56 to be provided for transmitting a higher current and/or a higher output of, for example, 30 A and/or 500 Watts. The output contact sockets 54, 56 in a coupled state have an electrical resistance of at most 15 mΩ. The output contact sockets 54, 56 in a coupled state have an electrical resistance of at most 12 mΩ.

(20) The signal contact socket 58 is provided for further electrical linking of the attachment device 12 on the tool basic module 10, said electrical linking being coupled to the mechanical linking. The signal contact socket 58 is provided for transmitting an electric output and/or an electric signal between the tool basic module 10 and the attachment device 12. The signal contact socket 58 is provided for transmitting a current of at most 25 mA. It is conceivable for the signal contact socket 58 to be provided for transmitting a current of up to 1 A. It is conceivable for the electrical interface 26 in an alternative design embodiment to include only the output contact sockets 54, 56.

(21) The attachment device 12 configured as a screwdriver attachment is provided for mechanically linking in terms of drive technology and electrically linking to the tool basic module 10. The attachment device 12 has a main input shaft 66 and a coupling device 68 which has a mechanical interface 70 for mechanically linking the main input shaft 66 in terms of drive technology on the main output shaft 16 of the tool basic module 10, as well as an electrical interface 72 for electrically coupling to an electrical interface 26 of the tool basic module 10. The mechanical interface 70 is in particular configured as an annular, in particular at least substantially hollow-cylindrical, appendage of a housing 116 of the attachment device 12. The mechanical interface 70 of the attachment device 12 is in particular attached to the housing 116 of the attachment device 12, or is at least in part configured by the housing 116 of the attachment device 12, and/or is at least in part configured so as to be integral to the housing 116 of the attachment device 12. The mechanical interface 70 configures a collar which in an assembled state is provided for engaging across the mechanical interface 24 of the tool basic module 10. The mechanical interface 70 of the attachment device 12 has an internal diameter 118 which in particular at least substantially corresponds to a diameter 108 of the mechanical interface 70 of the tool basic module 10. The mechanical interface 70 of the attachment device 12 has in particular an internal diameter of at least substantially 35 mm, preferably of at least substantially 40 mm, and preferably of at least substantially 45 mm. The coupling device 68 has at least one material protrusion 62 which extends along an assembling direction and which while assembling is provided for engaging in a material clearance 60 of the tool basic module 10. The material clearance 60 in combination with the material protrusion 62 serves as an orientation aid for aligning the attachment device 12 relative to the tool basic module 10 when assembling the attachment device 12 on the tool basic module 10. The mechanical interface 70 of the attachment device 12 is configured so as to correspond to the mechanical interface 24 of the tool basic module 10.

(22) The mechanical interface 70 of the attachment device 12 in the present exemplary embodiment has three form-fitting elements 74, 76, 78 which are disposed so as to be in each case offset by 120° on the internal circumference 80 of the mechanical interface 70 of the attachment device 12. The mechanical interface 70 of the attachment device 12 has two form-fitting elements 74, 76 of identical type, which are configured as material protrusions on the internal face of the mechanical interface 70 of the attachment device 12. The two form-fitting elements 74, 76 of identical type are configured as ribs. The two form-fitting elements 74, 76 of identical type are provided for being received in two form-fitting elements 28, 30 of the tool basic module 10 that are configured in a corresponding manner. The mechanical interface 70 of the attachment device 12 furthermore has a form-fitting element 78 which is configured as a flattening of the internal face of the mechanical interface 70. The form-fitting element 78 configured as a flattening is provided for bearing on a planar form-fitting element 32 of the tool basic module 10 that is configured in a corresponding manner.

(23) The mechanical interface 70 of the attachment device 12 has a plurality of locking hooks 42, 44, 46 which are provided for engaging in the locking openings 36, 38, 40 of the mechanical interface 24 of the tool basic module 10. The mechanical interface 70 of the attachment device 12 in the present exemplary embodiment has three locking hooks 42, 44, 46 which are disposed so as to be in each case offset by 90° about the main input shaft 66.

(24) The main input shaft 66 is provided for transmitting a torque from the main output shaft 16 of the tool basic module 10 to the attachment device 12. The main input shaft 66 of the attachment device 12 in the present exemplary embodiment is configured as a hexagonal shaft. Alternatively, the main input shaft 66 can be configured as a shaft having any arbitrary polygonal cross-section. The main input shaft 66 in the embodiment illustrated is provided for connecting in a rotationally fixed manner to the shaft receptacle 18 of the tool basic module 10. The main input shaft 66, for coupling the attachment device 12 in terms of drive technology to the tool basic module 10, is provided for engaging at least in part in the receptacle clearance 52 of the shaft receptacle 18. The attachment device 12 has an operational output 64 in the form of a tool receptacle 104 which is provided for receiving an insert tool such as, for example, a screwdriver bit, a brush, or a mixer.

(25) The attachment device 12 has an electrical interface 72 which is configured so as to correspond to the electrical interface 24 of the tool basic module 10. The electrical interface 72 for transmitting a high electric output and/or a high electric current has two output plug contacts 82, 84 of identical type, and for transmitting a low electric output and/or a low electric current has a signal plug contact 86. The signal plug contact 86 is disposed between the two output plug contacts 82, 84 and oriented so as to be at least substantially perpendicular to said two output plug contacts 82, 84. The output plug contacts 82, 84 and the signal plug contact 86 are disposed completely within the collar formed by the mechanical interface 72 of the attachment device 12. On account thereof, damage to, in particular bending of, the output plug contacts 82, 84 and the signal plug contact can be at least largely prevented, for example when the attachment device 12 is dropped.

(26) The tool basic module 10 comprises at least one open-loop and/or closed-loop control unit 106 which is provided for evaluating at least one operating parameter of the drive unit 14, said operating parameter being in particular transmitted from the attachment device 12 to the tool basic module 10 by way of the signal plug contact 86 and the signal contact socket 58. The operating parameter is preferably a memorized value read from a memory, for example an EEPROM, of the attachment device 12. In particular, a plurality of operating parameters can be read from the memory of the attachment device. The operating parameter can be, for example, a maximum rotating speed, a maximum torque, a rotation direction, or the like, of the drive unit 14. In particular, the operating parameters in the memory of the attachment device 12 are specific to the respective type of the attachment device 12.

(27) The open-loop and/or closed-loop control unit 106 in at least one operating state controls in an open-loop and/or closed-loop manner a power supply of the drive unit 14 and/or power supply of the electrical interface 26 as a function of the value of the key indicator. For example, the open-loop and/or closed-loop control unit 106 as a function of the type of the coupled attachment device 12 establishes control variables and/or process variables such as, for example, limit values of an output supplied to the drive unit 14, limit values of an output, of a torque and/or a rotating speed, said output, torque and/or rotating speed being transmitted by way of the main output shaft 16. The open-loop and/or closed-loop control unit 106 as a function of the type of the coupled attachment device 12 establishes control variables and/or process variables for the output contact sockets 54, 56, such as limit values of an output, of a current and/or of a voltage, for example.

(28) FIG. 6 shows the attachment device 12 having an opened rear side. The locking hooks 42, 44, 46 are collectively disposed on a displacement element 120. The displacement element 120 in the embodiment illustrated is configured in the manner of a semi-circular bracket, the locking hooks 44, 46 being disposed at the free end of the latter. The locking hook 42 is provided so as to be substantially centric on the bracket-shaped displacement element 120. A linear displacement of the displacement element 120 leads to an identical linear movement of all locking hooks 120. The displacement element 120 by means of a compression spring (not visible here) is mounted in a resilient manner in the housing 116 of the attachment device 12. The compression spring is provided for impinging the displacement element 120 with a spring force which is provided for holding the locking hooks 42, 44, 46 in a locking position. The locking hooks 42, 44, 46 having in each case one introduction ramp 122. When assembling, the locking hooks 42, 44, 46 when being introduced into the locking openings 36, 38, 40 of the tool basic module 10 by virtue of the introduction ramp 122 are displaced into the unlocking position counter to the spring force of the compression spring. In the course of being further introduced into the locking openings 36, 38, 40 of the tool basic module 10, the locking hooks 42, 44, 46 latch into the locking openings 36, 38, 40, wherein the locking hooks 42, 44, 46 on account of the spring force of the compression spring are moved to the locking position. The attachment device 12 has an unlocking button 124 for releasing the attachment device from the tool basic module 10. The unlocking button 124 is configured as a pushbutton. The unlocking button 124 is operatively coupled to the displacement element 120. When the unlocking button. 124 is activated, a linear movement of the displacement element 120 takes place counter to the spring force of the compression spring, on account of which the locking hooks 42, 44, 46 are moved to the unlocking position. Releasing the attachment device 12 from the tool basic module 10 is enabled on account thereof.