HANDHELD PULL AND PUSH DEVICE

Description

[0001] The invention relates to a hand-held pulling and pushing device for driving interchangeable tools, with a drive unit having a battery-operated electric motor, a screw drive with a threaded spindle connected to the electric motor and rotatably mounted on a housing body, and a threaded nut rotatably mounted on the threaded spindle and non-rotatably mounted on the housing body via a bearing unit, and a coupling unit connected to a first tool holder for transmitting tensile and compressive forces resulting from the direction of rotation of the threaded spindle from the threaded nut to the first tool holder.

[0002] Hand-held pulling and pushing devices, i.e. devices that can be used by a single person in a mobile manner, such as hand-held, electric riveting and pressing devices for setting blind rivet elements, such as blind rivets and blind rivet nuts, or for carrying out punching processes and for setting punch rivets, which have a drive unit with an electric motor-driven threaded spindle of a screw drive, are known in a wide variety of designs from the prior art. The screw drive converts a rotary movement of the electric motor into a linear movement of the pulling or pressing tool in a known manner. When carrying out the setting process of a blind rivet element, for example, a pulling mandrel of the blind rivet element is moved axially.

[0003] The riveting and pressing devices described above are used, for example, in motor vehicle workshops for carrying out repair work on vehicle bodies and for maintenance work on pipe or cable connections. Depending on the work to be performed, it is necessary to drive a wide variety of interchangeable tools with the riveting and pressing devices. Even known handheld devices that enable the operation of both pulling and pressing tools have the disadvantage of limited connection and / or drive options for interchangeable tools. Document DE 10 2021 115744 A1 discloses a tool according to the preamble of claim 1.

[0004] Based on this, the object of the invention is to provide a hand-held pulling and pushing device which is reliable and flexible for driving interchangeable tools.

[0005] The invention solves the problem by a hand-held pulling and pushing device having the features of claim 1. Advantageous further developments of the invention are specified in the dependent claims.

[0006] The screw drive of the hand-held pulling and pushing device according to the invention is designed to transmit rotational movements of the threaded spindle to a second tool holder.

[0007] The hand-held pulling and pushing device according to the invention is connected via a coupling unit to a first tool holder, which is designed to interchangeably hold different pulling and pressing tools required for the respective application. When used as a pushing device, the first tool holder can be designed, for example, to hold a rivet striker, which is used in conjunction with a rivet clamp arranged on the pushing device for setting rivets. When used as a pulling device, the first tool holder can, for example, be provided with suitable clamping devices for a blind rivet shank or have other means for transmitting tensile forces. Alternatively or additionally, the first tool holder can also be designed to hold corresponding pulling tools, wherein the pulling tools have, for example, clamping means by means of which the tensile forces can then be transmitted.

[0008] The coupling unit is further connected to the threaded nut in such a way that both tensile and compressive forces resulting from the direction of movement of the threaded spindle and the resulting linear adjustment of the threaded nut are reliably transmitted to the coupling unit.

[0009] The screw drive, in particular the threaded spindle, is designed such that the rotational movement of the threaded spindle and / or the torque of the electric motor can be transmitted to the second tool holder. Tools preferably arranged on the second tool holder can preferably be connected to the second tool holder in such a way that the tools are rotated depending on the rotational movement transmitted from the electric motor to the threaded spindle.

[0010] The hand-held pull-and-push device according to the invention allows the tool required for the respective operation to be arranged on the first tool holder, depending on the work to be performed, for example, when used in a motor vehicle workshop when performing bodywork work. Thus, the hand-held pull-and-push device allows both pulling and pressing work to be carried out, e.g., setting blind rivets or performing punching work. The linear adjustment of the selected tool required for the respective operation is reliably transmitted to the first tool holder via the coupling unit, since the coupling unit, according to the invention, transmits both pulling and compressive forces from the threaded nut to the respective tool.For drawing or pressing work, the tool holder is moved by means of the tensile or compressive forces preferably continuously and particularly preferably free of jerky changes of direction in the direction of the longitudinal axis of the threaded spindle.

[0011] Furthermore, the inventive design of the screw drive for transmitting rotary movements of the threaded spindle to the second tool holder enables not only drawing and pressing operations but also rotary operations, whereby, for example, a blind rivet nut can be set using the rotary movement of the second tool holder and a rotary tool arranged therein. The arrangement of the first tool holder on the coupling unit or the second tool holder on the screw drive allows the optional transmission of tensile and compressive forces or torques and / or rotary movements to a tool. This allows the hand-held pulling and pushing device to be used reliably and flexibly to drive various interchangeable tools.

[0012] The design of the screw drive for converting the rotary motion of the electric motor into a linear motion of the threaded nut and thus of the drawing or pressing tool operatively connected to the threaded nut is fundamentally freely selectable. The screw drive is preferably designed such that a tensile or compressive force of 1-7 tons, preferably 2-6 tons, acts on the coupling unit and / or the first tool holder. The threaded spindle preferably has an outer diameter of 10-30 mm, preferably 12-25 mm, particularly preferably 14-22 mm, which advantageously enables a particularly compact screw drive. For example, trapezoidal thread spindles can be used, the thread pitch of which can typically be selected in the range of 2 to 10 mm depending on the forces to be achieved.

[0013] Particularly preferably, the screw drive is designed as a ball screw drive or planetary screw drive. The use of such screw drives with balls or rollers as rolling elements is characterized by the fact that, in contrast to trapezoidal screw drives, in which surfaces rub against each other, they have a particularly high level of efficiency. This allows the dimensions of the electric motor to be reduced in order to achieve the desired tensile forces or pressing pressures, so that the hand-held pulling and pushing device can be designed particularly compactly. Typical thread pitches of ball screws or planetary screw drives are 5 to 10 mm. The threaded spindle preferably has a pitch of 2-8 mm, particularly preferably 3-7 mm, and most preferably 4-6 mm.

[0014] The inventive design of the hand-held pull and push device provides that the first tool holder is operatively connected to the threaded nut in such a way that the pulling and pushing forces resulting from the direction of rotation of the threaded spindle are transmitted to the first tool holder. The necessary design of the coupling unit with the threaded nut is, in principle, freely selectable.

[0015] According to an advantageous development of the invention, the tension and compression device comprises a connecting element for transmitting tensile and compressive forces from the threaded nut to the coupling unit, wherein the connecting element is operatively connected to a first end face of the threaded nut via a first connecting portion and to the coupling unit via a second connecting portion. The connecting portions of the connecting element are spaced apart from one another in the longitudinal axis direction of the threaded spindle. The threaded nut has a first and a second end face, which are oriented substantially perpendicular to the longitudinal axis direction of the threaded spindle and thus to the adjustment direction of the threaded nut.

[0016] To secure the position of the connecting element relative to the threaded nut, it is preferably designed such that the connecting sections are connected to one another, viewed in the longitudinal axis direction of the threaded spindle. Particularly preferably, the connecting element is formed integrally and / or in one piece. The interconnection of the connecting sections ensures mutual transmission of the forces acting on the connecting sections from the threaded nut, depending on its adjustment direction. The operative connection of the second connecting section to the coupling unit also ensures that the coupling unit is fixed relative to the threaded nut.

[0017] Forces acting toward the coupling unit due to a correspondingly directed adjustment of the threaded nut lead to compressive forces between the threaded nut and the coupling unit, which are transmitted via the coupling unit to the first tool holder. In the case of an opposite direction of movement of the threaded nut, the compressive forces acting on the first connecting section of the connecting element and generated by the threaded nut are transmitted via the second connecting section of the connecting element to the coupling unit, so that tensile forces are correspondingly transmitted via the coupling unit to the first tool holder.

[0018] The use of a connecting element according to the advantageous development of the invention described above ensures, in a particularly reliable manner, that both tensile and compressive forces are reliably transmitted from the threaded nut to the first tool holder. Furthermore, the one-piece and / or single-part connecting element enables a more compact and stable design compared to a multi-part adapter unit with two interconnected connecting elements.According to an advantageous embodiment of the invention, it is provided that the first connecting section of the connecting element rests on the first end face of the threaded nut and the second connecting section, projecting in the longitudinal axis direction of the threaded spindle beyond a second end face of the threaded nut, is in engagement with a coupling section of the coupling unit, whereby the coupling unit rests on the second end face of the threaded nut.

[0019] According to this embodiment of the invention, the connecting element, together with the coupling unit engaging the second connecting section, forms a cage-like body enclosing the threaded nut. The first connecting section adjacent to the first end face and the second connecting section engaging the coupling section of the coupling unit reliably ensure that tensile and compressive forces are transmitted from the threaded nut via the coupling unit to the first tool holder.

[0020] The first connecting portion is preferably designed as a projection extending radially relative to the longitudinal axis of the threaded spindle. Furthermore, the two connecting portions of the connecting element are preferably connected to one another via a sleeve portion extending in the longitudinal axis of the threaded spindle and encompassing the threaded nut. The second connecting portion is preferably designed as an internal thread and engages with the coupling portion of the coupling unit, which is particularly preferably designed as an external thread.

[0021] In the case of compressive forces resulting from a movement of the threaded nut towards the coupling unit, these are transferred directly to the coupling unit due to the coupling unit bearing against the second end face of the threaded nut. A movement of the threaded nut opposite to the coupling unit results in tensile forces which result from a conversion of the compressive forces acting on the first connecting section of the connecting element and are transferred via the sleeve section to the second connecting section of the connecting element. The coupling unit bears against the second end face of the threaded nut. The advantageous design of the connecting element ensures, in a simple manner, a reliable conversion of the compressive forces acting on the first connecting section into tensile forces acting on the coupling unit which is in engagement with the second connecting section via the coupling section.

[0022] According to an advantageous development of the invention, the coupling unit is designed such that the second tool holder can be connected to the threaded spindle. The coupling unit is preferably designed such that the second tool holder can be arranged on the threaded spindle and connected to it without dismantling the coupling unit. The coupling unit is particularly preferably sleeve-shaped. In this case, sleeve-shaped is understood to mean that the coupling unit has a free area extending in the longitudinal axis direction of the threaded spindle for the second tool holder to pass through, for example in the form of a through-opening. Due to the advantageous design of the coupling unit, the second tool holder can be quickly and easily arranged on the threaded spindle and connected to it for transmitting the rotary movements.

[0023] According to an advantageous embodiment of the invention, the coupling unit is connected to the threaded nut in a rotationally fixed manner. This embodiment of the invention makes it possible to dispense with a possibly provided rotationally fixed arrangement of the coupling unit on the housing body, since the rotationally fixed connection of the threaded nut to the housing body provided according to the invention subsequently also ensures that the coupling unit is arranged in a rotationally fixed manner on the housing body. The bearing unit provided for the rotationally fixed arrangement of the threaded nut can in principle be designed in any desired manner. For example, it is conceivable for the bearing unit to be designed as a feather key embedded in the threaded nut, which is mounted in a corresponding guide rail on the housing body.

[0024] According to an advantageous development of the invention, the bearing unit is designed such that the threaded nut and / or the coupling unit connected to the threaded nut in a rotationally fixed manner are supported in a rolling manner on the housing body. According to this embodiment of the invention, the bearing unit has at least one rolling element, via which the threaded nut is supported in a rolling manner relative to the housing body. This embodiment of the invention ensures increased efficiency by reducing losses due to friction. Furthermore, the use of a correspondingly developed bearing unit offers a particularly simple, play-free bearing of the threaded nut, so that tensile and compressive forces are reliably transmitted.

[0025] The specific design of the bearing unit for the rolling support of the coupling unit on the housing body, whereby suitable rolling elements are usually used for this purpose, is generally freely selectable. For example, the bearing unit has a bearing roller rotatably arranged on a bearing journal projecting radially from the threaded nut or the coupling unit and supported circumferentially on two opposite sections of the housing body, or two bearing rollers each rotatably arranged on a bearing journal projecting radially from the threaded nut or the coupling unit and circumferentially supported on one of two opposite sections of the housing body on.

[0026] According to the above embodiment of the invention, the bearing unit comprises one or two bearing rollers rotatably mounted on bearing journals that protrude perpendicular to the adjustment direction from the threaded nut or coupling unit. If a single bearing roller is used, it is supported on the housing body by two sections arranged opposite one another, viewed perpendicular to the adjustment direction of the threaded nut. The bearing roller rolls on the opposite housing body sections when the threaded nut is adjusted along the longitudinal axis of the threaded spindle.

[0027] In the advantageous use of two bearing rollers, the threaded nut or the coupling unit has two bearing journals protruding from the threaded nut or the coupling unit perpendicular to the adjustment direction of the threaded nut, on each of which a bearing roller is rotatably mounted. The two bearing rollers are each supported by a region on the housing body, with the support regions being arranged opposite one another on the housing body, viewed perpendicular to the adjustment direction of the threaded nut, so that reliable support is also achieved when the threaded nut is adjusted, with the bearing rollers each rolling on the housing body.

[0028] The design of the housing body for supporting the bearing unit is fundamentally freely selectable. However, the housing base body is particularly preferably formed in one piece and has a guide for supporting the bearing roller. In this case, the two sections of the housing base body are preferably formed as support surfaces of the guide. The guide extends in the longitudinal axis direction of the threaded spindle and is designed, for example, as an elongated hole, with the support surfaces being formed as inner surfaces of the elongated hole. For example, the housing base body is made of a metal material, e.g., an aluminum material.

[0029] The design of the coupling unit for connection to the first tool holder or the design of the threaded spindle for connection to the second tool holder can generally be freely selected. For example, the coupling unit and the first tool holder can also be formed as a single piece. To arrange the second tool holder, the coupling unit is removed, for example, together with the first tool holder, from the housing base of the hand-held pull-and-push device and / or removed from the threaded nut. Alternatively or additionally, the threaded spindle and the second tool holder are formed as a single piece. According to an advantageous development of the invention, however, it is provided that the first tool holder is designed for a detachable connection to the coupling unit and / or the second tool holder is designed for a detachable connection to the threaded spindle.This design of the coupling unit and the threaded spindle allows for the simple and particularly flexible arrangement of adapted first or second tool holders on the coupling unit or the threaded spindle, depending on the work to be performed. This permits the use of standardized drawing and pressing tools as well as rotary tools and additionally expands the application range of the pulling and pushing device.

[0030] The design for the detachable connection of the threaded spindle and / or the second tool holder is fundamentally freely selectable. For example, the second tool holder is connected to the threaded spindle in a force-fitting manner, e.g. by means of an additional connecting element. In this case, the connecting element, e.g. a screw, is removed from the threaded spindle to release the second tool holder. According to an advantageous embodiment of the invention, however, it is provided that the threaded spindle and / or the second tool holder are designed to form a positive connection in the circumferential direction of the threaded spindle. To form the positive connection, preferably at least one shaped section arranged on the threaded spindle or the second tool holder and at least one recess arranged on the second tool holder or the threaded spindle for arranging the shaped section are provided.

[0031] The mold section and the recess are arranged in or at an angle to the longitudinal axis of the threaded spindle and / or particularly preferably each have a cross-section extending in the longitudinal axis direction of the threaded spindle. For example, the mold section and the recess are designed and / or arranged on the threaded spindle or the second tool holder in such a way that the second tool holder is connected to the threaded spindle via a bayonet lock between the mold section and the recess. Preferably, the mold section and / or the recess have a polygonal or elliptical cross-section to form the positive connection in the circumferential direction. Due to the advantageous design of the threaded spindle and / or the second tool holder, additional connecting elements can be dispensed with.In addition, the advantageous form-locking allows for a simple and quick connection of the threaded spindle with the second tool holder.

[0032] The transmission of the motor's rotary motion to the threaded spindle can, in principle, be achieved in any desired manner. According to an advantageous development of the invention, the drive unit comprises a gear unit connecting the electric motor and the threaded spindle. The use of a gear unit allows for the transmission of high torques with minimal space and weight.

[0033] Two- to three-stage planetary gears, for example, but also cycloidal and spur gears, are used as gears, which provide the desired gear ratios. Preferably, the speed of the electric motor and / or the gear ratio and / or the pitch of the threaded spindle are adjusted such that the first tool holder connected to the threaded nut via the coupling unit is adjusted during operation at a feed rate of 700-8000 mm / min, preferably 1300-5100 rpm, more preferably 1900-3800 rpm, most preferably 2750 rpm. The gear preferably has a gear ratio of 1:70 to 1:30, preferably 1:60 to 1:40, more preferably 1:55 to 1:45, most preferably 1:50. The speed of the electric motor is preferably 25,000 - 30,000 rpm, preferably 26,000 - 29,000 rpm, particularly preferably 27,000 - 28,000 rpm, most particularly preferably 27,500 rpm.In combination with preferably provided brushless motors, which are battery-operated, an optimal coordination between the electric motor gearbox, the threaded spindle, and the resulting force can be achieved. Furthermore, the drive unit, in particular the electric motor and / or the gearbox, are designed such that a torque of 10-100 Nm, preferably 15-95 N / m, most preferably 15-25 N / m and / or 75-95 N / m acts on the threaded spindle.

[0034] In the simplest embodiment of the hand-held push-pull 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 can be selected. According to an advantageous embodiment of the invention, the push-pull device has a control unit connected to at least one sensor unit for controlling and / or archiving the operating processes.

[0035] According to this design, the use of a control unit allows for targeted control of the corresponding operating processes, such as pulling, pressing, and / or turning processes. For example, the control unit allows for particularly simple adjustment of the required pulling or pushing forces, allowing the operating processes to be carried out with exceptional reliability. The control unit can also be designed to archive the completed operating processes, allowing for reliable logging of the work performed.

[0036] The sensor unit can be designed to monitor the adjustment path, the pulling or pressing forces, the torque, or the like, which are required for the execution of the work processes and their successful completion. According to a particularly advantageous embodiment of the invention, the control unit is provided with a display that makes it particularly easy for the operating personnel to operate the handheld pulling and pushing device. Furthermore, this can also be connected to a central database via suitable wireless transmission means.

[0037] An embodiment of the invention is explained below with reference to the drawings. In the drawings: Fig. 1 is a perspective view of a hand-held pulling and pushing device with a first tool holder; Fig. 2 is a sectional view of the pulling and pushing device of Fig. 1; Fig. 3 a perspective view of the pulling and pushing device of Fig. 1 and 2 with a connected rivet bracket; Fig. 4 a sectional view of the pull and push device of Fig. 1 - 3 with a second tool holder.

[0038] Figure 1 shows a perspective view of a pulling and pushing device 1 with a drive unit 4 having an electric motor 3 and a gear 35 connected to the electric motor 3. By means of the electric motor 3, a threaded spindle 7 of a screw drive 5 connected to the gear 35 is driven via the gear 35, wherein the threaded spindle 7 is rotatably mounted in a bearing receptacle 36 of a housing body 6 (cf. Figure 2 ).

[0039] In addition to the threaded spindle 7, the screw drive 5 also has a threaded nut 9 arranged on the threaded spindle 7, which is mounted in a rotationally fixed manner on the housing body 6. The threaded nut 9 serves to drive a first tool holder designed as a piston rod 10, which is adjustably mounted in a bearing holder 33 in the longitudinal axis direction of the threaded spindle 7, i.e. in the direction of the threaded spindle axis G, so that by means of the pull and push device 1 via a connected rivet bracket 2 (cf. Fig. 3 ) Punch riveting operations can be carried out.

[0040] The piston rod 10 is connected to the threaded nut 9 via a detachably connected coupling unit 11, which rests at its end opposite the piston rod 10 against a second end face 14 of the threaded nut 9. To secure the coupling unit 11 against rotation relative to the threaded nut 9, the coupling unit 11 further has projections 34 on its contact surface with the second end face 14 of the threaded nut 9, which projections engage in recesses on the second end face 14 of the threaded nut 9.

[0041] A connecting element 12 is used to transmit the linear movement generated by the threaded nut 9 to the coupling unit 11. This connecting element 12 has a first connecting section 15 resting against the first end face 13 of the threaded nut 9 facing the gear 35, and a second connecting section 16 engaging with a coupling section 20 of the coupling unit 11. The latter is arranged so as to protrude beyond the second end face 14 of the threaded nut 9 in the direction of the threaded spindle axis G. The first and second connecting sections 15, 16 are connected to one another via a sleeve section 18, so that the connecting element 12 and the coupling unit 11 enclose the threaded nut 9 like a cage.

[0042] Compressive movements, i.e. adjustment movements of the threaded nut 9 in the direction of the piston rod 10 are transmitted to the coupling unit 11 via the direct contact of the coupling unit 11 with the second end face 14 of the threaded nut 9. In order to generate tensile forces as a result of a displacement of the threaded nut 9 in the direction of the drive unit 4, the compressive forces acting on the first connecting section 15 resting on the first end face 13 of the threaded nut 9 are transmitted via the sleeve section 18 to the second connecting section 16, which is in engagement with the coupling section 20 of the coupling unit 11, so that the compressive forces are converted into tensile forces there.

[0043] A bearing unit 8, which is attached to the coupling unit 11, serves to secure the threaded nut 9 against rotation on the housing body 6. The coupling unit 11 has a bearing pin 19 oriented perpendicular to the threaded spindle axis G and protruding from the coupling unit 11, on which a bearing roller 21 is rotatably arranged. The bearing roller 21 is supported by two adjacent sections arranged to the threaded spindle axis G in the form of two parallel inner surfaces 24 of a guide designed as an elongated hole 22, so that upon an adjustment movement of the threaded nut 9 in the direction of the threaded spindle axis G, the bearing roller 21 rolls on the inner surfaces 24. The housing body 6 is formed in one piece from a metal material and the elongated hole 22 extends in the direction of the threaded spindle axis G.The bearing unit 8 and thus also the threaded nut 9 via the torsion-proof connection of the coupling unit 11 with the threaded nut 9 are supported on the housing body 6.

[0044] The screw drive 5 is, as in Fig. 4 shown, designed to transmit rotary movements of the threaded spindle 7 to a second tool holder 25. A recess 26 is arranged on the threaded spindle 7 in order to form a positive connection in the circumferential direction of the threaded spindle axis G with a shaped section 27 arranged on the second tool holder 25. The shaped section 27 and the recess 26 each have a polygonal cross-section extending in the direction of the threaded spindle axis G. The coupling unit 11 is sleeve-shaped, ie the coupling unit 11 has a free area designed as a through-opening 28 for the second tool holder 25 to pass through.

[0045] A control unit 29 for controlling and / or archiving the operating processes is also arranged on the hand-held pull and push device 1. The control unit 29 is connected to an actuating element 30, a rotation sensor 31 for detecting the torque of the electric motor 3, and a force sensor 32 for detecting the pull and push forces of the piston rod 10.

[0046] To arrange the second tool holder 25 on the threaded spindle 7, the piston rod 10 is first detached from the coupling unit 11 and removed from the housing base body 6 in the direction of the threaded spindle axis G. The second tool holder 25 is then pushed into the housing body 6 in the direction of the threaded spindle axis G, guided through the through-opening 28 of the coupling unit 11, and the mold section 27 is connected to the recess 26 to form a positive connection with the threaded spindle 7.

[0047] All features explained in connection with individual embodiments of the invention can be provided in different combinations for the hand-held pulling and pushing device in order to realize their advantageous effects, even if they have been described for different embodiments.

[0048] The scope of the present invention is given by the claims and is not limited by the features explained in the description or shown in the figures. List of reference symbols

[0049] 1Pull and push device 2Rivet bracket 3Electric motor 4Drive unit 5Screw drive 6Housing body 7Threaded spindle 8Bearing unit 9Threaded nut 10First tool holder / piston rod 11Coupling unit 12Connecting element 13First end face (threaded nut) 14Second end face (threaded nut) 15First connecting section (connecting element) 16Second connecting section (connecting element) 18Sleeve section (connecting element) 19Bearing journal 20Coupling section (coupling unit) 21Bearing roller (one roller) 22Elongated hole / guide 24Inner surface / section of the housing base body 25Second tool holder 26Recess 27Shaped section 28Through opening / free area 29Control unit 30Actuating element 31Rotation sensor 32Force sensor 33Bearing mount 34Protrusion 35Gearbox 36Bearing mount GGreed spindle axis

Claims

1. Hand-held pulling and compressing device for driving interchangeable tools, with - a drive unit (4) comprising a battery-operated electric motor (3), - a screw drive (5) with a threaded spindle (7) connected to the electric motor (3) and mounted rotatably on a housing body (6), and a threaded nut (9) mounted rotatably on the threaded spindle (7) via a bearing unit (8) and non-rotatably on the housing body (6), and - a coupling unit (11) connected to a first tool holder (10) for transmitting tensile and compressive forces resulting from the direction of rotation of the threaded spindle (7) from the threaded nut (9) to the first tool holder (10), characterized in that the screw drive (5) is designed to transmit rotational movements of the threaded spindle (7) to a second tool holder (25).

2. Hand-held pulling and compressing device according to claim 1, characterized by a connecting element (12) for transmitting tensile and compressive forces from the threaded nut (9) to the coupling unit (11), the connecting element (12) being operatively connected to a first end face (13) of the threaded nut (9) via a first connecting section (15) and to the coupling unit (11) via a second connecting section (16).

3. Hand-held pulling and compressing device according to claim 1 or 2, characterized in that the first connecting section (15) of the connecting element (12) bears against the first end face (13) and the second connecting section (16) projects beyond a second end face (14) of the threaded nut (9) in the longitudinal axis direction of the threaded spindle (7) and is in engagement with a coupling section (20) of the coupling unit (11).

4. Hand-held pulling and compressing device according to one of the preceding claims, characterized in that the coupling unit (11) is designed in such a way that the second tool holder (25) can be connected to the threaded spindle (7).

5. Hand-held pulling and compressing device according to one of the preceding claims, characterized in that the coupling unit (11) is connected non-rotatably to the threaded nut (9).

6. Hand-held pulling and compressing device according to one of the preceding claims, characterized in that the bearing unit (8) is designed in such a way that the threaded nut (9) and / or the coupling unit (11) connected non-rotatably to the threaded nut (9) are supported on the housing body (6) in a rolling manner.

7. Hand-held pulling and compressing device according to one of the preceding claims, characterized in that the first tool holder (10) is designed for detachable connection to the coupling unit (11) and / or the second tool holder (25) is designed for detachable connection to the threaded spindle (7).

8. Hand-held pulling and compressing device according to one of the preceding claims, characterized in that the threaded spindle (7) and / or the second tool holder (25) are designed to form a positive fit in the circumferential direction of the threaded spindle (7).

9. Hand-held pulling and compressing device according to one of the preceding claims, characterized in that the drive unit (4) has a gear (35) connecting the electric motor (3) and the threaded spindle (7).

10. Hand-held pulling and compressing device according to one of the preceding claims, characterized by a control unit (29) connected to at least one sensor unit (31, 32) for controlling and / or archiving the operating processes.