Handheld pulling and compressing device
By introducing a switching unit and an interchangeable tool holder in the handheld pull and compression device, the problem of limited application possibility in the prior art is solved, and the ability and safety of flexible adaptation to different working operations is achieved.
Patent Information
- Application Number
- CN202410792505.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Priority Date
- 2023-06-26
- Filing Date
- 2024-06-19
- Publication Date
- 2024-12-27
AI Technical Summary
The application possibility of existing handheld pull and compression devices is limited, making it difficult to flexibly adapt to different operating operations.
A handheld pull and compression device with a switching unit is designed, which couples and decouples the screw driver with the drive unit through the switching unit, provides an interchangeable tool holder capable of transmitting tension and compression forces as needed, and Stop the adjustment of the tool when necessary to ensure flexibility and safety.
The ability to flexibly use different tools in places such as vehicle workshops ensures flexibility and safety in work operations, avoids the problem of tool adjustment suddenly changing direction, and simply and reliably stops tool adjustment in overload or dangerous situations.
Smart Images
Figure CN119187428A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to a hand-held pulling and compressing device for driving interchangeable tools, which has
[0002] - a drive unit having a battery-operated electric motor,
[0003] a screw drive having a threaded spindle rotatably mounted on a housing body and a nut rotatably mounted on the threaded spindle and non-rotatably mounted on the housing body via a bearing unit, and
[0004] - A coupling unit, which is connected to the tool holder for transmitting the tensile and compressive forces resulting from the rotational direction of the threaded spindle from the nut to the tool holder. Background Art
[0005] In various embodiments, a hand-held pulling and compressing device, i.e. a device that can be used by a person on a movable substrate, is known from the prior art, for example for setting blind rivet elements (e.g. blind rivets and blind rivet nuts) or for performing a punching process and for setting punch rivets, a hand-held electric riveting and pressing device having a drive unit, which has a motor-driven threaded spindle with a screw drive. The screw drive converts the rotary movement of the motor into a linear movement of the pulling and pressing tool in a known manner. In the case of a setting operation of a blind rivet element, for example, the spindle of the blind rivet element is moved axially.
[0006] For example, in vehicle workshops, when repair work is carried out on the body of a vehicle and maintenance work is carried out on pipe or cable connections, the above-mentioned hand-held pulling and compressing device is used. Depending on the work to be performed, it is necessary to use the pulling and compressing device to drive a variety of different interchangeable tools.
[0007] Known handheld devices which enable the operation of a pulling and pressing tool have the disadvantage of limited application possibilities. Summary of the invention
[0008] On this basis, the object of the present invention is to provide a hand-held pulling and compressing device which can be used simply and flexibly for different working operations.
[0009] The invention solves this object by a hand-held pulling and compressing device having the features of claim 1. Advantageous further embodiments of the invention are given in the dependent claims.
[0010] According to the invention, the hand-held pulling and compressing device has a switching unit for coupling and decoupling the spindle drive to the drive unit.
[0011] The hand-held pulling and compressing device according to the invention is connected via a coupling unit to a tool holder, which is designed to interchangeably accommodate different pulling and pressing tools required for the respective application. For example, when used as a compression device, the tool holder can be designed to hold a riveter, which is used in combination with a rivet clamp for setting rivets arranged on the compression device. When used as a pulling device, the tool holder can, for example, be provided with a suitable clamping device for the shank of the blind rivet or have other devices for transmitting the pulling force. Alternatively or additionally, the tool holder can also be designed to hold a corresponding pulling tool, whereby the pulling tool has, for example, a clamping device, through which the pulling force can then be transmitted.
[0012] The coupling unit is connected to the nut in such a way that the tensile and compressive forces resulting from the direction of movement of the threaded spindle and the resulting linear adjustment of the nut are reliably transmitted to the coupling unit.
[0013] A switching unit is understood to be a unit intended to connect a screw drive decoupled from a drive unit to a drive unit or to disconnect a screw drive connected to a drive unit from a drive unit. The switching unit is preferably designed such that the screw drive can be decoupled from the drive unit manually or particularly preferably automatically.
[0014] The pulling and compressing device according to the invention makes it possible to arrange the tools required for the respective working operation on the tool holder, depending on the work to be carried out, for example as part of its use in body processing in a vehicle workshop. For example, the handheld pulling and compressing device can be used for pulling and pressing work, for example, for setting blind rivets or for performing punching work. The linear adjustment of the selected tool required for the respective working operation is reliably transmitted to the tool holder via the coupling unit, since the coupling unit transmits the tensile and compressive forces from the nut to the respective tool via the tool holder. For carrying out the pulling or pressing work, the tool holder is preferably moved continuously in the direction of the longitudinal axis of the threaded spindle by means of the tensile and compressive forces and particularly preferably without sudden changes of direction.
[0015] Furthermore, the switching unit provided according to the invention enables the screw drive to be decoupled from the drive unit, whereby the rotational movement of the electric motor is not transmitted to the threaded spindle and thus a linear adjustment of the nut and / or the coupling unit and / or the tool holder is prevented. In the event of an overload of the screw drive or if there is an immediate risk of injury to the user, for example due to a hand or finger being held in the tool area, the adjustment of the tool can be stopped in a simple and reliable manner using the switching unit. Furthermore, by decoupling the screw drive from the drive unit, the switching unit enables the torque of the electric motor to be tapped off independently of the screw drive, for example by setting a rotation axis.
[0016] According to an advantageous further development of the invention, it is provided that the switching unit is adjustable between a coupled state, in which the threaded spindle is connected to the drive unit, and a decoupled state, in which the threaded spindle is separated from the drive unit. In the coupled state, the screw drive is preferably connected to the drive unit via the switching unit in such a way that the rotational movement of the electric motor is transmitted to the threaded spindle. In the decoupled state, the screw drive is preferably separated from the drive unit by the switching unit in such a way that the rotational movement of the electric motor is not transmitted to the threaded spindle. The switching unit is adjusted between the states, for example manually by a user or, for example automatically by a control unit. By adjusting the switching unit between the coupled state and the decoupled state, it is also possible to couple and decouple the screw drive from the drive unit in a simple manner.
[0017] Preferably, the screw drive is designed so that a rotating shaft for transmitting the rotary motion of the motor to the tool is arranged on the motor. According to an advantageous embodiment of the invention, it is provided that the threaded spindle is designed as a hollow spindle for receiving a rotating shaft connected to the motor. A hollow spindle is understood to be a threaded spindle having a hollow space extending in the direction of the longitudinal axis of the threaded spindle. The rotating shaft is preferably connected to the motor in such a way that the rotating shaft can rotate independently of the switching unit arranged in the coupled state or the decoupled state. Preferably, the rotating shaft is arranged coaxially with the hollow spindle. It is particularly preferred that the rotating shaft is installed in the hollow spindle so that it can rotate around the longitudinal axis of the hollow spindle. For example, at least one bearing element, such as a roller bearing, such as a needle roller and cage assembly or a ball bearing, is provided for supporting the rotating shaft. It is particularly preferred that the tool holder is also hollow so that the rotating tool can be connected to the rotating shaft without previously removing the tool holder connected to the coupling unit.
[0018] Designing the threaded spindle as a hollow spindle makes it easy to arrange the rotary shaft on the electric motor so that the rotary shaft rotates independently of the position of the switching unit. This makes it easy to switch between transmitting the pulling and / or compressive forces via the tool holder and transmitting the rotary movement through the rotary shaft. Furthermore, no additional tool holder connected to the threaded spindle is required to replace the tool holder connected to the coupling unit. Furthermore, the rotary movement transmitted from the rotary shaft to the tool is not limited by the stroke of the nut and / or the tool holder, making the hand-held pulling and compressing device particularly flexible in use.
[0019] According to an advantageous further development of the invention, it is provided that the switching unit has a coupling element, which in the coupled state connects the threaded spindle to the drive unit. The coupling element is preferably designed in such a way that in the coupled state of the switching unit, the threaded spindle is connected to the drive shaft of the drive unit, such as the drive shaft of the electric motor or the gear connected to the electric motor, via the coupling element. Further preferably, the coupling element is designed in such a way that the threaded spindle is separated from the drive shaft in the decoupled state. Preferably, the coupling element is cylindrical and has a cross section extending in the direction of the longitudinal axis, which cross section is, for example, circular. Particularly preferably, the coupling element has an inner space extending in the direction of the longitudinal axis of the threaded spindle for at least partial arrangement of the drive shaft and / or the threaded spindle and / or the rotation axis. Preferably, the coupling element has an inner wall surrounding the inner space. For example, the coupling element is designed as a sleeve. The coupling element for connecting the threaded spindle to the drive shaft of the electric motor in the coupled state enables a simple design of the switching unit.
[0020] According to an advantageous embodiment of the invention, it is provided that the switching unit is designed and / or arranged on the housing body in such a way that the adjustment between the coupled state and the uncoupled state is achieved by adjusting the drive unit and / or the coupling element relative to the screw drive. Adjustment relative to the screw drive is understood to be, for example, a movement of the coupling element along a movement path arranged at a certain angle to the longitudinal axis of the threaded spindle, preferably a movement of the drive unit and / or the coupling element along the longitudinal axis of the threaded spindle. The switching unit is particularly preferably arranged between the screw drive and the drive unit in the longitudinal direction of the threaded spindle. This makes it possible to omit adjusting the drive unit to change between the coupled state and the uncoupled state, thereby enabling an economical and efficient design of the switching unit. Advantageous embodiments of the invention also enable an effective and reliable coupling and decoupling of the screw drive with the drive unit.
[0021] According to an advantageous embodiment of the invention, it is provided that the coupling element has at least one coupling section for a positive connection with the threaded spindle in the coupled state. The threaded spindle preferably has at least one connecting section which can engage with the coupling section of the coupling element. The coupling section and / or the connecting section are preferably designed in such a way that in the coupled state a positive fit is formed between the threaded spindle and the coupling element in the circumferential direction of the longitudinal axis of the threaded spindle. Preferably, the coupling element is connected to the drive shaft of the drive unit in a positive fit, for example via a feather key or a feather key-like connection.
[0022] The connecting section is preferably arranged on the end portion of the threaded spindle. The end portion of the threaded spindle describes a section extending from the end surface of the threaded spindle in the direction of the longitudinal axis of the threaded spindle. Preferably, the connecting section is formed as a recess of the threaded spindle and the coupling section is formed as a protrusion protruding from the inner wall into the inner space. In order to achieve a low-resistance change from the uncoupled state to the coupled state, the connecting section particularly preferably has an insertion area, which is widened at an angle to the longitudinal axis of the threaded spindle for guiding the coupling section when adjusting the switching unit from the uncoupled state to the coupled state. Preferably, the coupling element has at least two, preferably at least three, particularly preferably at least four coupling sections distributed in the circumferential direction of the coupling element. The threaded spindle preferably has a plurality of connecting sections corresponding to the number of coupling sections.
[0023] The coupling section advantageously provided on the coupling element and the connecting section preferably provided on the threaded spindle enable the coupling element to be fixed to the threaded spindle in a simple manner and, due to the form fit in the circumferential direction of the threaded spindle, enable the rotational movement of the electric motor to be transmitted particularly reliably to the screw drive.
[0024] According to an advantageous further development of the invention, a switching unit is provided with an adjusting element, which is used to adjust the coupling element between a coupling position assigned to a coupling state and a decoupling position assigned to a decoupling state. The adjustment of the coupling element from the coupling position to the decoupling position causes the switching unit to be adjusted from the coupling state to the decoupling state. The adjusting element is connected to the coupling element in such a way, for example mechanically or electromechanically, that the adjustment of the coupling element is achieved by actuation and / or movement of the adjusting element. Particularly preferably, the coupling element for adjusting the switching unit from the coupling state to the decoupling state can be mechanically or electromechanically adjusted between the coupling position and the decoupling position. For example, the adjusting element is designed as an electric actuator or preferably as a mechanical switching element. The switching unit and / or the coupling element can be adjusted between the coupling state and the decoupling state or between the coupling position and the decoupling position in a particularly simple manner by the adjusting element.
[0025] According to an advantageous further development of the invention, it is provided that the switching unit has a guide for an adjustment element, which is designed in such a way that the coupling element is moved in the longitudinal direction of the threaded spindle for adjustment between the coupling position and the uncoupling position. The guide is preferably arranged on the housing body of the device. Particularly preferably, the guide is designed as a recess in the housing body, along which the adjustment element for adjusting the coupling element between the coupling position and the uncoupling position can be adjusted. For example, the guide is designed as an elongated hole or preferably as a spiral groove. Spiral is preferably understood to mean that the groove on the housing body is arranged around the longitudinal axis of the threaded spindle in a threaded or spiral manner. The adjustment element is preferably adapted to the type and shape of the guide, i.e., in the case of a guide designed as a spiral groove, the adjustment element is designed, for example, as a switching ring. Preferably, the adjustment element is arranged on the coupling element in such a way that the adjustment element is fixed to prevent the torque of the electric motor from being transmitted from the coupling element to the adjustment element. Preferably, the adjustment element is mounted on the coupling element to counteract an undesired rotation around the longitudinal axis of the threaded spindle. The guide enables a simple and reliable adjustment of the coupling element between the coupled position and the uncoupled position, so that the switching unit can be adjusted particularly easily and quickly between the coupled state and the uncoupled state.
[0026] The torque of the electric motor can be transmitted to the coupling element and / or the threaded spindle and / or the rotating shaft in any desired manner. Preferably, the drive unit has a gear connecting the electric motor and the coupling element and / or the rotating shaft. The use of gears allows high torques to be transmitted in a small installation space and weight.
[0027] For example, the gears used are two- to three-stage planetary gears, but also cycloid gears and spur gears, which provide the desired transmission. Preferably, the speed of the motor and / or the transmission ratio and / or the pitch of the threaded spindle are adjusted in such a way that the first tool holder connected to the nut via the coupling unit is adjusted during operation to a feed speed of 700-8000 mm / min, preferably 1300-5100 mm / min, particularly preferably 1900-3800 mm / min, most preferably 2750 mm / min. Preferably, the gears have a transmission of 1:70 to 1:30, preferably 1:60 to 1:40, particularly preferably 1:55 to 1:45, most preferably 1:50. The speed of the motor is preferably 25000 to 30000 rpm, preferably 26000 to 29000 rpm, particularly preferably 27000 to 28000 rpm, most preferably 27500 rpm. In combination with the preferably provided battery-operated brushless motor, an optimal coordination between the gears, the threaded spindle and the forces generated can be achieved. Furthermore, the drive unit, in particular the electric motor and / or the gears, are formed in such a way that a torque of 10-100 Nm, preferably 15-95 Nm, most preferably 15-25 Nm and / or 75-95 Nm acts on the threaded spindle and / or the rotating shaft.
[0028] In the simplest embodiment of the hand-held pulling and compressing device according to the invention, the electric motor can be operated in such a way that only the direction of rotation of the threaded spindle and / or the rotating shaft can be selected. According to an advantageous embodiment of the invention, it is provided that the pulling and compressing device has a control unit connected to at least one sensor unit for controlling and / or documenting the operating process.
[0029] According to the design, the use of a control unit allows targeted control of corresponding operating processes, such as pulling, pressing and / or turning operations. For example, the control unit can be used to set the expected tensile or compressive force in a particularly simple way, so that the operating process can be performed particularly reliably. Preferably, the control unit can be used to automatically switch between the adjusting element positions and therefore between the positions of the switching unit in the case of electromechanical adjustment of the adjusting element. This makes it possible to program more complex operations, in which different working operations can be performed one after another or in any combination, for example using tensile and compressive forces or torques. For example, the blind rivet nut is first screwed into the thread provided for this purpose by a torque transmitted via a rotating shaft, and then, after switching the switching unit from the uncoupled state to the coupled state, it is set by the tensile force generated by the screw drive and transmitted to the tool holder via the coupling unit. A control unit can also be provided to archive the operating processes performed, so that the work performed can be reliably recorded.
[0030] The sensor unit can be designed to monitor the adjustment travel, the pulling and pressing forces, the torques etc. required to perform the working operation and its successful completion. According to a particularly advantageous embodiment of the invention, the control unit is provided with a display, which makes it particularly easy for the operator to operate the hand-held pulling and compressing device. In addition, this can also be connected to a central database via suitable wireless transmission means. BRIEF DESCRIPTION OF THE DRAWINGS
[0031] Embodiments of the present invention are explained below with reference to the accompanying drawings. The accompanying drawings show:
[0032] Figure 1 is a perspective view of a hand-held pulling and compressing device having a switching unit;
[0033] Figure 2 for Figure 1 A longitudinal sectional view of a pulling and compressing device of the present invention, wherein the switching unit is arranged in a coupled state;
[0034] Figure 3 for Figure 1 and Figure 2 A longitudinal section of a pulling and compressing device, wherein the switching unit is set in a decoupled state, and
[0035] Figure 4 for Figure 4 Detailed view of the switching unit in . DETAILED DESCRIPTION
[0036] Figure 1 A perspective view of a pulling and compressing device 1 with a drive unit 4 is shown, which comprises an electric motor 3 and a gear 2 connected to the electric motor 3. By means of the electric motor 3, a threaded spindle 7 of a screw drive 5 which can be connected to the gear 2 is driven via the gear 2, the threaded spindle 7 being rotatably mounted in a bearing seat 23 of a housing body 6 (see Figure 2 ).
[0037] In addition to the threaded spindle 7, the screw drive 5 has a nut 9 arranged on the threaded spindle 7, which is non-rotatably mounted on the housing body 6. The nut 9 serves to drive a tool holder in the form of a piston rod 10, which is mounted so as to be adjustable in the direction of the longitudinal axis of the threaded spindle 7, i.e. in the direction of the threaded spindle axis G. The piston rod 10 is connected to the nut 9 via a detachably connected coupling unit 11. The bearing unit 8, which is attached to the coupling unit 11, serves to non-rotatably mount the nut 9 on the housing body 6.
[0038] The hand-held pulling and compressing device has a switching unit 13 for coupling and decoupling the screw drive 5 with the drive unit 4. The switching unit 13 has a coupling element 14, an adjusting element 15 and a guide 16 for the adjusting element 15. The switching unit 13 can be Figure 2 The coupling state of the threaded spindle 7 connected to the drive unit 4 is shown and Figure 3 The illustrated embodiment is adjusted between the decoupled states in which the threaded spindle 7 is separated from the drive unit 3 .
[0039] The threaded spindle is designed as a hollow spindle 7 to accommodate a rotating shaft 12 connected to the motor 3. The rotating shaft 12 is connected to the motor 3 in such a way that the rotating shaft 12 can rotate independently of the switching unit 13 set in a coupled state or an uncoupled state. In addition, the rotating shaft 12 is coaxially arranged with the hollow spindle 7.
[0040] The switching unit 13 is arranged between the screw drive 5 and the drive unit 4 in the longitudinal direction of the hollow spindle 7. The coupling element is designed as a sleeve 14 and has an inner space 17 extending in the direction of the threaded spindle axis G. The drive shaft 21 of the drive unit 4, the hollow spindle 7 and the rotating shaft 12 are at least partially arranged in the inner space 17. In addition, the sleeve 14 has an inner wall 18 surrounding the inner space 17.
[0041] In addition, the sleeve 14 has four coupling sections 19 distributed in the circumferential direction of the hollow spindle 7 for positive connection with the hollow spindle 7 in the coupled state. The hollow spindle 7 has four connecting sections 20, each of which can be engaged with one of the coupling sections 19 of the sleeve 14. The coupling section 19 and the connecting section 20 are designed so that in the coupled state, a positive fit is formed between the hollow spindle 7 and the sleeve 14 in the circumferential direction of the threaded spindle axis G. In addition, the sleeve 14 is positively connected to the drive shaft 21 by a connection similar to a feather key.
[0042] The connecting section 20 is arranged on the end portion 22 of the hollow spindle 7. The connecting section is formed as a recess 20 of the hollow spindle 7 and the coupling section 19 is formed as a protrusion 23 protruding from the inner wall 18 into the inner space 17. In order to achieve a low-resistance change from the uncoupled state to the coupled state, the recesses 20 each have an insertion area 24, which widens at an angle to the threaded spindle axis G for guiding the coupling section 19 when adjusting the switching unit 13 from the uncoupled state to the coupled state.
[0043] The guide 16 is arranged on the housing body 6 of the device 1 and is designed in such a way that the sleeve 14 is moved in the longitudinal direction of the hollow spindle 7 for use in the coupling position assigned to the coupling state (eg Figure 2 ) and the decoupling position assigned to the decoupling state (as shown in Figure 3 The sleeve 14 can be mechanically adjusted between the coupled position and the uncoupled position to move the switching unit 13 from the coupled state to the uncoupled state.
[0044] Furthermore, the guide is designed as a spiral groove 16 of the housing body 6, along which the adjusting element 15 can be adjusted to move the sleeve 14 between the coupling position and the decoupling position. The adjusting element is designed as a switching ring 15 and is mounted on the coupling element in such a way that the switching ring 15 is fixed to prevent the torque of the motor 3 from being transmitted from the sleeve 14 to the switching ring 15.
[0045] With the switching unit 13 arranged in the coupled state, the torque generated by the electric motor 3 is transmitted to the hollow spindle 7 of the screw drive 5 in a form-fitting manner via the sleeve 14 and is converted into a translational movement of the coupling unit 11 and the piston rod 10 by the screw drive 5. In order to adjust the switching unit 13 from the coupled state to the uncoupled state, the switching ring 15 is moved along the spiral groove 16 and the sleeve 14 is adjusted relative to the screw drive 5 along the threaded spindle axis G in the direction of the drive unit 3. As a result, the coupling section 19 and the connecting section 20 are disengaged, thus releasing the form-fitting match of the sleeve 14 and the hollow spindle 7. In both positions, the torque of the electric motor 3 can be tapped and transmitted to the rotating tool located at the end of the rotating shaft 12 via the rotating shaft 12 connected to the drive shaft 21.
[0046] In addition, if Figure 2 and Figure 3 As shown in the example in, a control unit 25 for controlling and / or archiving the operation process is provided on the handheld pulling and compressing device 1. The control unit 25 is connected to a rotation sensor 26 for detecting the torque of the motor 3 and a force sensor 27 for detecting the pulling force and compressing force of the piston rod 10.
[0047] The switching unit 13 allows the screw drive 5 to be decoupled from the drive unit 4, whereby the rotational movement of the motor 3 is not transmitted to the hollow spindle 7, and thus a linear adjustment of the nut 9, the coupling unit 11 and the piston rod 10 is prevented. The design of the threaded spindle as the hollow spindle 7 and the rotary shaft 12 connected to the motor 3 via the drive shaft 21 and the gear 2 enables a simple switch between the transmission of tensile and / or compressive forces via the piston rod 10 and the transmission of the rotational movement via the rotary shaft 12.
[0048] All features explained in connection with the various embodiments of the invention can be provided to the hand-held pulling and compressing device in different combinations in order to achieve their advantageous effects, even if they have been described for different embodiments. For example, the adjustment element 15 can alternatively be designed as an electric actuator and can automatically adjust the sleeve 14 by means of a control unit 25 connected to the switching unit 13. Alternatively or additionally, an adjustment of the drive unit 4 and the sleeve 14 relative to the screw drive 5 is possible in order to couple the hollow spindle 7 to the sleeve 14 or decouple it from the sleeve 14.
[0049] Reference numerals list
[0050] 1 Pulling and compression device
[0051] 2 gears 3 motors
[0052] 4 Drivers
[0053] 5 Screw drive
[0054] 6 Shell body
[0055] 7 Threaded spindle (hollow spindle)
[0056] 8 Bearing units
[0057] 9 Nut
[0058] 10 Tool holder (piston rod)
[0059] 11 Coupling unit
[0060] 12 Rotation axis
[0061] 13 Switching unit
[0062] 14 Coupling element (sleeve)
[0063] 15 Adjustment element (switching ring)
[0064] 16 Guide (spiral groove)
[0065] 17 Internal Space
[0066] 18 Inner wall
[0067] 19 Coupling section (protrusion)
[0068] 20 Connecting section (recess)
[0069] 21 Drive shaft
[0070] 22 End section of threaded spindle
[0071] 23 Bearing seat
[0072] 24 Insertion area
[0073] 25 Control Unit
[0074] 26 Rotation Sensor
[0075] 27 Force Sensor
[0076] G Thread spindle axis
Claims
1. A hand-held pulling and compressing device for driving interchangeable tools, having - a drive unit (4) comprising a battery-operated electric motor (3), a screw drive (5) having a threaded spindle (7) rotatably mounted on a housing body (6) and a nut (9) rotatably mounted on the threaded spindle (7) and non-rotatably mounted on the housing body (6) via a bearing unit (8), and - a coupling unit (11) connected to a tool holder (10) for transmitting the tensile and compressive forces resulting from the rotational direction of the threaded spindle (7) from the nut (9) to the tool holder (10), It is characterized in that A switching unit (13) is used to couple and decouple the screw drive (5) with the drive unit (4).
2. The handheld pulling and compressing device according to claim 1, characterized in that: The switching unit (13) is adjustable between a coupled state in which the threaded spindle (7) is connected to the drive unit (4) and a decoupled state in which the threaded spindle (7) is separated from the drive unit (4).
3. The hand-held pulling and compressing device according to at least one of the preceding claims, characterized in that The threaded spindle is designed as a hollow spindle (7) for receiving a rotating shaft (12) connected to the electric motor (3).
4. The hand-held pulling and compressing device according to at least one of the preceding claims, characterized in that The switching unit (13) has a coupling element (14) which connects the threaded spindle (7) to the drive unit (4) in the coupled state.
5. The handheld pulling and compressing device according to claim 4, characterized in that: The switching unit (13) is designed and / or adjusted on the housing body (6) in such a way that adjustment between the coupled state and the uncoupled state is achieved by adjusting the drive unit (4) and / or the coupling element (14) relative to the spindle drive (5).
6. The handheld pulling and compressing device according to claim 4 or 5, characterized in that: The coupling element (14) has at least one coupling section (19) for positively locking connection to the threaded spindle (7) in the coupled state.
7. The hand-held pulling and compressing device according to at least one of claims 4 to 6, characterized in that The switching unit (13) has an adjusting element (15) for adjusting the coupling element (14) between a coupling position assigned to the coupled state and a decoupling position assigned to the decoupling state.
8. The handheld pulling and compressing device according to claim 7, characterized in that: The adjustment element (15) is designed such that the coupling element (14) can be mechanically or electromechanically adjusted between the coupling position and the decoupling position to adjust the switching unit (13) from the coupling state to the decoupling state.
9. The hand-held pulling and compressing device according to at least one of claims 4 to 8, characterized in that The switching unit (13) has a guide (16) for the adjustment element (15), which is designed in such a way that the coupling element (14) is moved in the longitudinal direction of the threaded spindle (7) for adjustment between the coupled position and the decoupled position.
10. The hand-held pulling and compressing device according to at least one of the preceding claims, characterized in that The switching unit (13) is arranged between the screw drive (5) and the drive unit (4) in the longitudinal direction of the threaded spindle (7).