Handheld pulling and compressing device and modular system

Abstract

The invention relates to a handheld pulling and compressing device for driving an interchangeable tool. In order to provide a hand-held pulling and compressing device which can be simply and flexibly used for different working operations, the pulling and compressing device has a tool unit with a screw drive and a tool holder. The screw drive has a threaded spindle rotatably mounted on the housing and a threaded nut rotatably mounted on the threaded spindle and non-rotatably mounted on the housing via a bearing unit. Furthermore, the pulling and compressing device has a drive unit with a battery operated electric motor for driving the threaded spindle, which drive unit can be connected to the tool unit via a coupler.

Description

Technical Field

[0001] The present invention relates to a hand-held pulling and compressing device for driving interchangeable tools. Background Art

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

[0003] The above-mentioned hand-held pulling and compressing device is used for example when carrying out repair work on vehicle bodies in vehicle workshops and maintenance work on pipe or cable connections.Depending on the work to be carried out, it is necessary to use a large number of different interchangeable tools with the pulling and compressing device, for example tools with different forces.

[0004] Known handheld devices which enable the operation of both pulling and pressing tools have the disadvantage that their application possibilities are limited by the design of the device, in particular the spindle drive and / or the drive unit. Summary of the invention

[0005] Based on this, 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.

[0006] The invention solves this object by a hand-held pulling and compressing device having the features of claim 1 and by a modular system having the features of claim 8. Further advantageous embodiments of the hand-held pulling and compressing device are given in claims 2 to 7.

[0007] The hand-held pulling and compressing device according to the invention has a tool unit with a screw drive and a tool holder. The screw drive has a threaded spindle rotatably mounted on a housing and a threaded nut rotatably mounted on the threaded spindle and non-rotatably mounted on the housing via a bearing unit. According to the invention, the pulling and compressing device has a drive unit that can be connected to the tool unit via a coupling and has a battery-operated electric motor for driving the threaded spindle.

[0008] The tool unit is connected via a coupling unit to a tool holder, which is designed to interchangeably hold different tools required for the respective application, such as pulling and pressing tools and / or rotating tools. 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 arranged on the compression device to set the rivet. When used as a pulling device, the tool holder can, for example, be provided with suitable clamping devices for the blind rivet rod or have other devices for transmitting tensile forces. Alternatively or additionally, the tool holder can also be designed to hold a corresponding pulling tool, wherein the pulling tool has, for example, a clamping device, via which the tensile force can then be transmitted.

[0009] The coupling unit is connected to the threaded 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 threaded nut are reliably transmitted to the coupling unit.

[0010] The electric motor and the rechargeable battery for driving the electric motor are preferably arranged in a base body which can be connected to the housing of the tool unit via a coupling. The coupling is preferably designed so that when the drive unit is fixed to the tool unit, the torque generated by the drive unit is transmitted to the screw drive.

[0011] The tensioning and compression device according to the invention makes it possible to connect tool units of different designs to a drive unit, depending on the work to be performed, for example when performing body work in a vehicle workshop. The coupling provided according to the invention allows a simple and standardized connection of various tool units optimized for different work to a drive unit, as well as a simple and rapid replacement of tool units and / or drive units in the event of maintenance. The pulling and compression device formed by connecting the drive unit to the tool unit allows pulling and pressing work to be performed, for example setting blind rivets or performing stamping 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 threaded nut to the respective tool via the tool holder.

[0012] According to a further advantageous development of the invention, the coupling has a data link and a power supply. The data link makes it possible to transmit data between the drive unit and the tool unit. For example, measured values ​​acquired by the tool unit are transmitted to the drive unit as data or information for various working operations, such as the travel path of the screw drive or the tool holder, are transmitted from the drive unit to the tool unit. The power supply also ensures that the tool unit is powered by the drive unit. For example, the power supply makes it possible to arrange a tool with a magnetic lock on the tool unit and operate it.

[0013] In principle, the tool unit can be fixed to the base body of the drive unit in any way. For example, a connecting section arranged on the housing of the tool unit is conceivable here, which is designed, for example, as a thread, which makes it possible to fix the tool unit to the connecting section of the base body of the drive unit by means of a corresponding thread. According to a preferred embodiment of the invention, the coupling provided for connecting the drive unit to the tool unit is designed as an electrical and / or mechanical coupling. For example, the coupling is designed as a mechanical bayonet lock or a ball lock. Regardless of whether it is designed as an electrical or mechanical coupling, the coupling can preferably be adjusted between a locked position and an unlocked position. In the locked position, the tool unit and the drive unit are preferably connected to each other so that the torque generated by the drive unit is transmitted to the tool unit, for example the threaded spindle of a screw drive. In the unlocked position, the tool unit and the drive unit can be separated from each other, so that the tool unit or the drive unit can be easily and flexibly replaced if necessary.

[0014] Preferably, the coupling is designed as a quick coupling. The use of a quick coupling is characterized in that it can be adjusted quickly and effortlessly by the operator between an unlocked position, in which the tool unit can be mounted on or removed from the drive unit, and a locked position, in which the tool unit is fixed to the drive unit. The quick coupling is characterized in particular in that an additional tool for removing or arranging the tool unit can be omitted. Thus, the design of the hand-held pulling and compressing device with a quick coupling enables a quick and easy replacement of the tool unit or mounting or removal of the tool unit on or from the pulling and compressing device.

[0015] In principle, the quick coupling can be adjusted between the unlocked and locked position in any manner, for example, the quick coupling can be designed to be mechanically adjustable between the unlocked and locked position by an operator. It is particularly preferred that the quick coupling can be adjusted between the unlocked and locked position by a drive unit. The use of a drive unit to operate the quick coupling, i.e. to adjust between the unlocked and locked position, increases the convenience of the hand-held pulling and compressing device in a special way. By using the operation of the drive unit, erroneous operation of the quick coupling can also be minimized or completely avoided.

[0016] According to a further advantageous development of the invention, the tool unit has a switching unit which is adjustable between a coupled state, in which the threaded spindle is connected to the drive unit (in particular with a coupling arranged in a locking position), and a disengaged 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, so that the rotational movement of the electric motor is transmitted to the threaded spindle. In the disengaged state, the screw drive is preferably separated from the drive unit via the switching unit, so that the rotational movement of the electric motor is not transmitted to the threaded spindle. The switching unit is adjusted manually (for example by a user) or automatically (for example by a control unit) between the two positions. The switching unit also allows the screw drive to be disengaged from the drive unit in a simple manner even when the coupling is in the locking position, as a result of which the rotational movement of the electric motor is not transmitted to the threaded spindle and a linear adjustment of the threaded nut and / or the coupling unit and / or the tool holder is thus prevented.

[0017] According to an advantageous embodiment of the invention, the threaded spindle and / or the switching unit and / or the rotary shaft are designed for a positive connection with a drive shaft of a drive unit. Preferably, the rotary shaft and the switching unit have at least one coupling section for a positive connection with the drive shaft. The threaded shaft can preferably be connected indirectly to the drive shaft via the switching unit.

[0018] The rotary shaft preferably has at least one first coupling section, which particularly preferably can be brought into engagement with a coupling section arranged on the drive shaft.

[0019] The first coupling section and / or the coupling section are preferably designed so that in the locked position a form fit is formed between the rotation shaft and the drive unit in the circumferential direction of the longitudinal axis of the drive shaft. Preferably, the switching unit is connected to the drive shaft of the drive unit in a form fit, for example via a second coupling section designed as a sliding key or a connection piece similar to a sliding key.

[0020] The coupling section is preferably arranged at the end section of the drive shaft. The end section of the drive shaft forms a section extending from the end face of the drive shaft in the longitudinal direction of the drive shaft. Preferably, the first coupling section is formed as a protrusion protruding from the end face of the rotating shaft facing the drive unit, and the coupling section is formed as a recess in the end face of the drive shaft.

[0021] The coupling section advantageously arranged on the rotating shaft and / or the switching unit and preferably on the drive shaft enables the rotating shaft and / or the switching unit and / or the screw drive to be fixed to the drive unit in a simple manner and, due to the form-fitting locking in the circumferential direction of the drive shaft, the rotational movement of the drive unit is transmitted to the tool unit particularly reliably.

[0022] Preferably, the screw drive of the tool unit is designed so that the rotary shaft for transmitting the rotary motion of the electric motor to the tool can be arranged on the electric motor. According to an advantageous further development of the invention, the threaded spindle is designed as a hollow spindle for receiving a rotary shaft that can be connected to the drive unit. A hollow spindle is to be understood as a threaded spindle having a hollow space extending in the longitudinal direction of the threaded spindle. The rotary shaft can preferably be connected to the electric motor so that the rotary shaft can rotate independently of the switching unit arranged in the coupled state or the disengaged state. Preferably, the rotary shaft is arranged coaxially with the hollow spindle. Particularly preferably, the rotary shaft is mounted 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 rolling bearing, such as a needle and bracket assembly or a ball bearing, is provided for mounting the rotary shaft. Particularly preferably, the tool holder is also hollow so that a rotating tool can be connected to the rotary shaft without previously disassembling the tool holder connected to the coupling unit.

[0023] The threaded spindle is designed as a hollow spindle, so that the rotary shaft can be easily arranged on the drive unit, so that the rotary shaft can be rotated independently of the position of the switching unit. This makes it easy to switch between the transmission of tensile and / or compressive forces via the tool holder and the transmission of the rotary movement via the rotary shaft. In addition, no additional tool holder connected to the threaded spindle is required to replace the tool holder connected to the coupling unit. In addition, the rotary movement transmitted from the rotary shaft to the tool is not limited by the stroke of the threaded nut and / or the tool holder, making the hand-held tensioning and compression device particularly flexible in use.

[0024] In principle, the torque of the drive unit can be transmitted to the tool unit, in particular the switching unit and / or the threaded spindle and / or the rotating shaft, in any desired manner. The drive unit preferably has a transmission connected to an electric motor, which has a drive shaft that can be connected to the tool unit. The use of a transmission allows high torques to be transmitted with a small installation space and weight.

[0025] The transmission used is, for example, a two-stage to three-stage planetary gear and also a cycloidal gear and a spur gear, which provides the desired transmission. The speed of the electric motor is preferably 25000-30000 rpm, preferably 26000-29000 rpm, particularly preferably 27000-28000 rpm, most preferably 27500 rpm. In combination with the preferably provided battery-operated brushless motor, an optimal coordination between the transmission, the threaded spindle and the resulting forces can be achieved. In addition, the drive unit, in particular the electric motor and / or the transmission is formed so that a torque of 10-100 Nm, preferably 15-95 N / m, most preferably 15-25 N / m and / or 75-95 N / m can be transmitted to the tool unit, in particular the threaded spindle and / or the rotating shaft.

[0026] In the simplest embodiment of the drive unit, the electric motor can be operated such that only the direction of rotation of the drive shaft can be selected. Particularly preferably, the drive unit has a control unit which is connected to the at least one sensor unit for controlling and / or documenting the operating method.

[0027] The control unit can be used to control the corresponding operating methods in a targeted manner, such as pulling, pressing and / or rotating operations, and for example to adjust the coupling between the unlocked position and the locked position. For example, the control unit can be used to set the desired tensile or compressive forces in a particularly simple manner, so that the operating method can be carried out particularly reliably. Preferably, the control unit can be used to automatically adjust the switching unit and the coupling, in particular the quick coupling. On the one hand, this makes the installation and removal of the tool unit from the drive unit particularly simple and flexible, and on the other hand, more complex operations can be programmed, in which different working operations can be carried out successively 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 the rotating shaft, and then after switching the switching unit from the disengaged state to the coupled state, the tensile force generated by the screw drive is set and transmitted to the tool holder via the coupling unit. The control unit can also be provided for archiving the operating methods carried out, so that the work carried out can be reliably recorded.

[0028] The sensor unit can be designed to monitor the adjustment paths, pulling and pressing forces, torques, etc. required for the execution of the working method and its successful completion. In addition, the sensor unit can, for example, monitor the connection and display a warning or error message on a preferably provided display in the event of a fault in the connection between the tool unit and the drive unit. The display also makes it particularly easy for the operator to operate the hand-held pulling and compressing device. In addition, the hand-held pulling and compressing device can also be connected to a central database or a mobile hand-held device, such as a smartphone or a tablet, via a suitable wireless transmission device.

[0029] The invention further solves the object by a modular system for a hand-held pulling and compressing device according to the invention or further developed as described above, wherein there are at least two tool units designed to generate different tensile and compressive forces and at least one drive unit which can be connected to the tool units in each case.

[0030] The tool unit preferably has different designs which are optimized for certain work operations, in particular with regard to the weight, size or ergonomics of the tool unit. For example, the threaded spindle of the tool unit has different thread pitches or the tool unit is connected in one piece with different tools so that a tool change is not possible.

[0031] According to the system of the invention, a variety of different working operations can be performed using the hand-held pulling and compressing device, and different tool units can be operated using one drive unit. This provides a continuously expandable system for the hand-held pulling and compressing device, in which the drive unit can be used continuously and different working areas are provided. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] The embodiments of the present invention are explained below with reference to the accompanying drawings. The accompanying drawings show:

[0033] Figure 1 is a schematic perspective view of a pulling and compressing device with a tool unit and a drive unit separated from the tool unit;

[0034] Figure 2 yes Figure 1 A schematic cross-sectional view of the pulling and compressing device, and

[0035] Figure 3 A device having a tool unit and a drive unit connected to the tool unit via a coupling Figure 1 and Figure 2 Schematic diagram of the cross section of the pulling and compression device. DETAILED DESCRIPTION

[0036] Figure 1 A perspective view of a pulling and compressing device 1 is shown with a tool unit 2 and a drive unit 3 separated from the tool unit 2 .

[0037] The tool unit 2 has a threaded spindle 4 of a screw drive 5, which is connectable to the drive unit 3 and is rotatably mounted on a housing 6 of the tool unit 2 (see Figure 2 ).

[0038] In addition to the threaded spindle 4, the screw drive 5 has a threaded nut 7 which is arranged on the threaded spindle 4 and is non-rotatably mounted on the housing 6. The threaded nut 7 serves to drive a tool holder designed as a piston rod 8, which is mounted so as to be adjustable in the longitudinal direction of the threaded spindle 4, i.e. in the direction of the threaded spindle axis G. The piston rod 8 is connected to the threaded nut 7 via a detachable coupling unit 9. A bearing unit 10 attached to the coupling unit 9 serves to non-rotatably mount the threaded nut 7 on the housing 6.

[0039] The drive unit 3 has an electric motor 11 and a transmission 12, which includes a drive shaft 14 and is connected to the electric motor 11. The drive unit 3 can be connected to the tool unit 2 via a coupling 13. The coupling 13 can be connected to the tool unit 2 via a coupling 13. Figure 1 and Figure 2 The unlocked position shown is the same as Figure 3Furthermore, the coupling has a data link for transmitting signals between the tool unit 2 and the control unit 22 of the drive unit 3 and a power supply for the tool unit 2 .

[0040] The tool unit 2 also has a switching unit 16 for coupling and disengaging the screw drive 5 with the drive unit 3. The switching unit 13 can be in a coupling state (such as coupling the threaded spindle 4 to the drive unit 3) in which the threaded spindle 4 is connected to the drive unit 3. Figure 3 ) and a disengaged state in which the threaded spindle 4 and the drive unit 3 are separated.

[0041] In this design example, the threaded spindle is designed as a hollow spindle 4 to accommodate a rotating shaft 17 connected to the electric motor 3. The rotating shaft 17 can be connected to the drive unit 3 so that the rotating shaft 17 can rotate independently of the switching unit 16 arranged in a coupled state or a disengaged state. In addition, the rotating shaft 17 is arranged coaxially with the hollow spindle 6.

[0042] The rotating shaft 17 has a first coupling section 18, which can be engaged with a coupling section 19 provided on the drive shaft 14. The first coupling section 18 and the coupling section 19 are designed so that in the locked position of the coupling, a form fit is produced between the rotating shaft 17 and the drive unit 3 in the circumferential direction of the longitudinal axis of the threaded spindle axis G. In addition, the switching unit 16 is connected to the drive shaft 14 of the drive unit 3 in a form-fitting manner via a second coupling section 20 designed as a feather key (see Figure 3 ).

[0043] Furthermore, the drive unit 3 has a rechargeable battery 21 for operating the electric motor 11 and a control unit 22 for controlling and / or archiving the operating method. The control unit 22 is connected to a rotation sensor 23 for detecting the torque of the drive unit 3 and a force sensor 24 for detecting the tensile and compressive forces of the tool unit 2. Furthermore, the control unit 22 is connected to a contact sensor 25 for checking the connection of the tool unit 2 to the drive unit 3 via the coupling 13. The electric motor 11, the rechargeable battery 21 and the control unit 22 are arranged in a base body, not shown, which can be connected to the housing 6 of the tool unit 2 via the coupling 13.

[0044] The system (not shown) for a handheld pulling and compressing device 1 has at least two tool units 2 designed to generate different tensile and compressive forces and at least one drive unit 3 which can be connected to the tool units 2 respectively.

[0045] All features explained in connection with the various embodiments of the present invention can be provided in different combinations for the hand-held pulling and compressing device in order to achieve their advantageous effects, even if these features have been described for different embodiments. For example, the coupling 13 for connecting the drive unit 3 to the tool unit 2 is designed as an electrical quick coupling, which can be electrically adjusted between a locked position and an unlocked position via the control unit 22.

[0046] Reference numerals list

[0047] 1 Pulling and compression device

[0048] 2 Tool Unit

[0049] 3 Drivers

[0050] 4 threaded spindle (hollow spindle)

[0051] 5 Screw drive

[0052] 6 Housing

[0053] 7 Threaded nut

[0054] 8 Tool holder (piston rod)

[0055] 9 Connection unit

[0056] 10 Bearing unit

[0057] 11 Electric Motor

[0058] 12 Transmission

[0059] 13 Connector

[0060] 14 Drive shaft

[0061] 16 Switching Unit

[0062] 17 Rotation axis

[0063] 18 First connection section

[0064] 19 Connection section

[0065] 20 Second connection section (feather key)

[0066] 21 Rechargeable battery

[0067] 22 Control unit

[0068] 23 Rotation sensor

[0069] 24 Force Sensor

[0070] 25 Contact Sensor

[0071] G Thread spindle axis

Claims

1. A hand-held pulling and compressing device for driving a pulling and pressing tool, having - Tool unit (2), comprising - a screw drive (5) having a threaded spindle (4) rotatably mounted on a housing (6) and a bearing unit (10) rotatably mounted on the threaded spindle (4) a threaded nut (7) non-rotatably mounted on the housing (6), and - a coupling unit (11), connected to a tool holder (8), for transmitting tensile and compressive forces resulting from the rotational direction of the threaded spindle (4) from the threaded nut (7) to the tool holder (8), and A drive unit (3), connectable to the tool unit (2) via a coupling (13), having a battery-operated electric motor (11) for driving the threaded spindle (4).

2. The handheld pulling and compressing device according to claim 1, characterized in that: The connector (13) has a data link and a power supply.

3. The handheld pulling and compressing device according to claim 1 or 2, characterized in that: The coupling (13) for connecting the drive unit (3) to the tool unit (2) is designed as an electrical and / or mechanical coupling (13).

4. The hand-held pulling and compressing device according to at least one of the preceding claims, characterized in that The coupling (13) is designed as a quick coupling.

5. The hand-held pulling and compressing device according to at least one of the preceding claims, characterized in that The tool unit (2) has a switching unit (16) which can be adjusted between a coupling state in which the threaded spindle (4) is connected to the drive unit (3) and a disengaging state in which the threaded spindle (4) is separated from the drive unit (3).

6. The hand-held pulling and compressing device according to at least one of the preceding claims, characterized in that The threaded spindle (4) and / or the switching unit (16) are designed for positive connection to a drive shaft (14) of the drive unit (3).

7. 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 (4) for receiving a rotating shaft (17) which can be connected to the drive unit (3).

8. A modular system for a hand-held pulling and compressing device according to at least one of the preceding claims, comprising - at least two tool units (2) designed to generate different tensile and compressive forces, and - At least one drive unit (3) connectable to each of said tool units (2).

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