Handheld pulling and compressing device and mechanical force amplifier

Abstract

The invention relates to a hand-held pulling and compressing device and a mechanical force amplifier for driving a hand-held pulling and compressing device of a pulling and pressing tool. A hand-held pulling and compressing device for driving an interchangeable tool has a drive unit including a battery operated electric motor, a first screw driver, a second screw driver, and a second screw driver. The first screw drive has a first threaded spindle rotatably mounted on the housing and a threaded nut rotatably mounted on the first threaded spindle and non-rotatably mounted on the housing via a bearing unit, and a coupling unit connectable to the tool holder, and a first threaded spindle for transmitting a tensile force and a compressive force generated by a rotation direction of the first threaded spindle from the first threaded nut to the tool holder. In order to provide a mechanical force amplifier for a hand-held pulling and compressing device and a hand-held pulling and compressing device which can be easily and flexibly adapted to different working operations, the mechanical force amplifier is provided with a connecting section, a connecting section for detachably fixing the mechanical force amplifier to a housing of the hand-held pulling and compressing device, and a tool connector for pulling and compressing the tool.

Description

Technical Field

[0001] The invention relates to a hand-held pulling and compressing device and a mechanical force amplifier of the hand-held pulling and compressing device for driving a pulling and pressing tool. Background Art

[0002] Hand-held pulling and pressing devices, i.e. devices that can be used mobile by one person, such as hand-held electric riveting devices for setting blind rivet elements such as blind rivets and blind rivet nuts or for punching processes and for setting punch rivets, which have a drive unit for a threaded spindle driven by an electric motor with a screw drive, are known from the prior art in a variety of embodiments. 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 operation 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 performed, it is necessary to use the pulling and compressing device to drive a large number of different interchangeable tools with different levels of force.

[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 invention is based on the object of providing a mechanical force amplifier for a hand-held pulling and compressing device and a hand-held pulling and compressing device which can be easily and flexibly adapted to different working operations.

[0006] The invention solves this object by a mechanical force amplifier having the features of claim 1 and a hand-held pulling and compressing device having the features of claim 7. Further advantageous embodiments of the mechanical force amplifier are given in claims 2 to 6. Further advantageous embodiments of the hand-held pulling and compressing device are given in claims 8 to 9.

[0007] The hand-held pulling and compressing device is connected via a coupling unit to a tool holder which is designed to interchangeably hold 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 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.

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

[0009] According to the invention, the pulling and compressing means are detachably connectable to a mechanical force amplifier according to the invention or further developed as described below.

[0010] Preferably, the pulling and compressing device has a switching unit, which can be adjusted between a coupled state in which the first threaded spindle is connected to the drive unit and a decoupled state in which the first threaded spindle is decoupled from the drive unit. A switching unit is to be understood as a unit which is intended to connect a first screw drive decoupled from the drive unit to the drive unit or to decouple a first screw drive connected to the drive unit from the drive unit. The switching unit is preferably designed such that the first screw drive can be decoupled from the drive unit manually or particularly preferably automatically. The switching unit enables the first threaded drive to be decoupled from the drive unit, so that the rotational movement of the electric motor is not transmitted to the first threaded spindle and thus blocks a linear adjustment of the first threaded nut and / or the coupling unit and / or the tool holder. Furthermore, by decoupling the first screw drive from the drive unit, the switching unit enables the torque of the electric motor to be utilized independently of the first screw drive, for example by arranging a rotating shaft.

[0011] The mechanical force amplifier according to the invention (hereinafter referred to as force amplifier) ​​is characterized by a connecting section for detachably fixing the mechanical force amplifier to a connecting section of a housing of a hand-held pulling and compressing device and a tool connection for a pulling and compressing tool. The mechanical force amplifier is understood to be a unit designed to mechanically increase the tensile and compressive forces generated by the hand-held pulling and compressing device and transmit them to the pulling or compressing tool. Preferably, the force amplifier is designed so that the torque generated by the drive unit of the pulling and compressing device is converted by the force amplifier into tensile and compressive forces that are higher than the tensile and compressive forces generated by the first screw drive. Particularly preferably, the force amplifier is connected to the drive unit of the pulling and compressing device so that the torque of the drive unit is transmitted to the force amplifier and converted by it into tensile and compressive forces.

[0012] Mechanical force amplifiers enable easy modification of pulling and compressing devices limited by their original design so that they can be used for different work operations with increased pressing force. The force amplifier can be connected to the tension and compression tool via a tool connection so as to transmit increased tension and compression forces to the tension and compression tool. By disassembling and assembling the force amplifier, it is easy to switch between using the tension and compression forces generated by the pulling and compression device and the tension and compression forces increased by the force amplifier.

[0013] According to a further advantageous development of the invention, the force amplifier has a coupling section for detachably connecting to the first threaded spindle and / or the drive unit of the pulling and compressing device. Preferably, the force amplifier is connected via the coupling section to the rotation axis of the drive unit of the pulling and compressing device. Particularly preferably, the first threaded spindle of the pulling and compressing device is designed as a hollow spindle for receiving the rotation axis. The force amplifier is reliably connected to the first threaded spindle or preferably to the drive unit of the pulling and compressing device via its coupling section.

[0014] In order to increase the force transmitted to the tensioning and compression tool, the force amplifier can in principle adopt any design. However, according to a further advantageous development of the invention, the force amplifier has a second screw drive, which has: a second threaded spindle rotatably mounted on the base body and having a coupling section, and a second threaded nut rotatably mounted on the second threaded spindle and non-rotatably mounted on the base body via a support unit. The second threaded spindle of the force amplifier is preferably rigidly connected to the first threaded spindle or the rotation axis of the tensioning and compression device via a coupling section.

[0015] The design for converting the rotary motion of the drive unit of the hand-held pulling and compressing device, in particular the rotary shaft, into a linear motion of the second threaded nut and thus of the pulling or pressing tool operatively connected to the second threaded nut is essentially freely selectable. The second screw drive is preferably designed such that a tensile or compressive force of 2-10 tons, preferably 4-8 tons, acts on the tool holder.

[0016] Particularly preferably, the second screw drive is designed as a ball screw drive or a planetary screw drive. The use of such screw drives with balls or rollers as rolling elements is characterized by their particularly high efficiency compared to trapezoidal screw drives with surfaces rubbing against each other, which makes it possible to reduce the size of the electric motor in order to achieve the desired tensile force or compression pressure, so that the hand-held pulling and compressing device can be designed to be particularly compact. The typical pitch of a ball screw drive or a planetary screw drive is 5 to 10 mm. Preferably, the second thread spindle has a pitch of 2-8 mm, more preferably 3-7 mm, most preferably 4-6 mm. Particularly preferably, the second thread spindle has a smaller pitch than the first thread spindle of the hand-held pulling and compressing device.

[0017] According to a further advantageous development of the invention, the force amplifier has a coupling element which can be connected to the tool holder for transmitting the tensile and compressive forces resulting from the rotational direction of the second threaded spindle from the second threaded nut to the tool holder. Preferably, the tool holder is operatively connected to the second threaded nut so that the tensile and compressive forces resulting from the rotational direction of the second threaded spindle are transmitted to the tool holder. The design of the coupling element with the threaded nut required for this is essentially freely selectable. Preferably, the design of the coupling element is similar to the coupling unit of a hand-held pulling and compressing device in order to achieve a cost-effective design of the force amplifier.

[0018] The tool holder is preferably removed from the pulling and compressing device before the force amplifier is installed and installed in the mechanical force amplifier after the installation. The advantageously provided coupling element enables the increased tensile and compressive forces to be transmitted to the tool holder arranged on the mechanical force amplifier and to the tensile and / or compressive tool connected to the tool holder in a simple and preferably cost-effective manner.

[0019] The supporting unit is preferably designed such that the second threaded nut and / or a coupling unit connected to the second threaded nut in a non-rotatable manner is supported in a rolling manner on the base body. Preferably, the supporting unit has at least one rolling element via which the second threaded nut is supported in a rolling manner relative to the base body. This embodiment of the invention ensures increased efficiency, since losses due to friction are reduced. Furthermore, the use of a suitably further developed supporting unit provides for a particularly simple mounting of the second threaded nut without play, thereby reliably transmitting tensile and compressive forces.

[0020] The connection of the force amplifier to the tension and compression device can in principle be designed as desired. According to an advantageous embodiment of the invention, the connection section of the force amplifier has a thread or a latching body for detachable fastening to the connection section of the tension and compression device having a thread or a latching body receptacle. A corresponding design of the connection section enables a secure and easily detachable connection between the force amplifier and the tension and compression device without the need for further components and / or fastening elements. In order to release the connection between the force amplifier and the tension and compression device, it is only necessary to unscrew it from the thread or release the locking connection.

[0021] The present invention further solves this problem by providing a hand-held pulling and compressing device for driving interchangeable tools, having

[0022] - a drive unit having a battery-operated electric motor,

[0023] a first threaded drive having a first threaded spindle rotatably mounted on the housing and a first threaded nut rotatably mounted on the first threaded spindle and non-rotatably mounted on the housing via a bearing unit, and

[0024] - a coupling unit, which can be connected to the tool holder, for transmitting tensile and compressive forces resulting from the rotational direction of the first threaded spindle from the first threaded nut to the tool holder, wherein,

[0025] - The pulling and compressing means are detachably connectable to a mechanical force amplifier according to the invention or further developed as described above.

[0026] The handheld pulling and compressing device according to the present invention can not only drive the mechanically driven pulling and pressing tool via the force amplifier with the maximum force generated by the pulling and compressing device, but also drive with a force exceeding the maximum force. Therefore, if necessary, it is possible to switch between the original drive via the pulling and compressing device and the amplified drive via the force amplifier in a simple manner by connecting or disconnecting the force amplifier to the pulling and compressing device. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The embodiments of the present invention are explained below with reference to the accompanying drawings. The accompanying drawings show:

[0028] Figure 1 is a schematic perspective view of a pulling and compressing device on which a mechanical force amplifier is arranged;

[0029] Figure 2 Shown in cross section Figure 1 A schematic diagram of a pulling and compressing device on which a mechanical force amplifier is arranged;

[0030] Figure 3 a schematic diagram showing in perspective a mechanical force amplifier for a hand-held pulling and compressing device, and

[0031] Figure 4 yes Figure 3 Schematic cross-sectional view of a mechanical force amplifier. DETAILED DESCRIPTION

[0032] Figure 1 A perspective view of a schematic diagram of a pulling and compressing device 1 is shown, which has a drive unit 4 including an electric motor 3. A first threaded spindle 7 of a first threaded drive 5 is driven by the electric motor 3, wherein the first threaded spindle 7 is rotatably mounted on a housing 6 (see Figure 2 ).

[0033] In addition to the first threaded spindle 7, the first screw drive 5 has a first threaded nut 9 arranged on the first threaded spindle 7, which is non-rotatably mounted on the housing 6. The first threaded 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 longitudinal direction of the first threaded spindle 7, i.e. in the direction of the threaded spindle axis G. The piston rod 10 is connected to the first threaded nut 9 via a detachably connected coupling unit 11. The bearing unit 8 attached to the coupling unit 11 serves to non-rotatably mount the first threaded nut 9 on the housing 6.

[0034] The hand-held pulling and compressing device has a switching unit 13 for coupling and decoupling the first screw drive 5 with the drive unit 4. The switching unit 13 has a sleeve 14 that can be adjusted in the direction of the threaded spindle axis G. The switching unit 13 can be adjusted between a coupling state in which the first threaded spindle 7 is connected to the drive unit 4 and a decoupling state in which the first threaded spindle 7 is decoupled from the drive unit 3, as shown in FIG. Figure 2 shown.

[0035] The first threaded spindle is designed as a hollow spindle 7 for receiving a rotating shaft 12 connected to the electric motor 3. The rotating shaft 12 is connected to the electric motor 3 so that the rotating shaft 12 can rotate independently of the switching unit 13 arranged in a coupled state or a disengaged state. In addition, the rotating shaft 12 is arranged coaxially with the hollow shaft 7.

[0036] The switching unit 13 is arranged between the first spindle drive 5 and the drive unit 4 in the longitudinal direction of the hollow spindle 7 .

[0037] When the switching unit 13 is arranged in the coupled state, the torque generated by the electric motor 3 of the drive unit is fixedly transmitted to the hollow main shaft 7 of the screw drive 5 via the sleeve 14 and converted by the screw drive 5 into a translational movement of the coupling unit 11 and the piston rod 10 that can be connected to the coupling unit 11.

[0038] In order to adjust the switching unit 13 from the coupled state into the disengaged state, the sleeve 14 is adjusted relative to the first screw drive 5 along the screw spindle axis G in the direction of the drive unit 4, thereby releasing the positive locking of the sleeve 14 and the hollow spindle 7. The torque of the electric motor 3 can be utilized in both positions via the rotary shaft 12 connected to the drive unit 4 and transmitted at the end of the rotary shaft 12 to a mechanical force amplifier 19 connected to the hand-held pulling and compressing device 1.

[0039] Figure 3 and Figure 4 The mechanical force amplifier 19 shown separately has a connection section 20 for detachably fixing the mechanical force amplifier 19 to a connection section 21 of the housing 6 of the hand-held pulling and compressing device 1 and a tool connection piece 22 for a pulling and compressing tool. The force amplifier 19 can be connected or connected to the rotating shaft 12 of the pulling and compressing device 1 via a connection section 23.

[0040] Furthermore, the force amplifier 1 has a second screw drive 24 with a second threaded spindle 26 rotatably mounted on a base body 25. The pitch of the second threaded spindle 26 is smaller than the hollow shaft 7 of the hand-held pulling and compressing device 1 in order to amplify the tensile and compressive forces transmitted to the piston rod 10. The coupling section 23 is arranged on the second threaded spindle 26.

[0041] In addition to the second threaded spindle 26, the second screw drive 24 has a second threaded nut 28 arranged on the second threaded spindle 26, which is non-rotatably mounted on the base body 25 via a support unit 27. The second threaded nut 28 serves to drive the piston rod 10. The force amplifier 19 has a coupling element 29, which can be connected to the piston rod 10 for transmitting the tensile and compressive forces generated by the rotational direction of the second threaded spindle 26 from the second threaded nut 28 to the piston rod 10.

[0042] By dismantling and assembling the force amplifier 1, switching between the tensile force and the compressive force generated by the tensile / compression device 1 and the tensile force and the compressive force increased by the force amplifier 19 can be achieved in a simple manner, wherein the piston rod 10 is removed from the tensile / compression device 1 before installing the force amplifier 1 and is installed in the mechanical force amplifier 1 after installation.

[0043] To achieve its advantageous effects, all features associated with the various embodiments of the present invention can be provided in different combinations for a mechanical force amplifier or a handheld pulling and compressing device, even if these features have been described for different embodiments. For example, the screw drive design of the pulling / compressing device 1 and the mechanical force amplifier 19 is the same, except that the threaded spindles 7, 26 are designed differently so that the mechanical force amplifier can be manufactured in a cost-effective and resource-saving manner.

[0044] Reference numerals list

[0045] 1Pulling and compression device

[0046] 3 Electric Motor

[0047] 4 drive units

[0048] 5First Screw Driver

[0049] 6 Shell

[0050] 7. First threaded spindle (hollow spindle)

[0051] 8 storage units

[0052] 9 First thread nut

[0053] 10 Tool holder (piston rod)

[0054] 11Connection unit

[0055] 12 Rotation Axis

[0056] 13 Switching unit

[0057] 14 sleeve

[0058] 15Regulator

[0059] 19 Mechanical force amplifier

[0060] 20 connection sections

[0061] 21Connection section

[0062] 22 Tool connector

[0063] 23 Connection section

[0064] 24 second screw driver

[0065] 25 Matrix

[0066] 26 Second thread spindle

[0067] 27 Support Units

[0068] 28 Second thread nut

[0069] 29 connection unit

[0070] G thread spindle axis

Claims

1. A mechanical force amplifier for a hand-held pulling and compressing device (1), having - a drive unit (4) comprising a battery-operated electric motor (3), a first threaded drive (5) having a first threaded spindle (7) rotatably mounted on a housing (6) and a first threaded nut (9) rotatably mounted on the first threaded spindle (7) and non-rotatably mounted on the housing (6) via a bearing unit (8), and a coupling unit (11) connectable to a tool holder (10) for transmitting tensile and compressive forces resulting from the rotational direction of the first threaded spindle (7) from the first threaded nut (9) to the tool holder (10), It is characterized in that A connecting section (20), a connecting section (21) for detachably fixing the mechanical force amplifier (19) to the housing (6) of the handheld pulling and compressing device (1), and a tool connection piece (22) for a pulling and compressing tool.

2. The mechanical force amplifier according to claim 1, characterized in that: A coupling section (23) for detachably connecting to the first threaded spindle (7).

3. The mechanical force amplifier according to claim 1 or 2, characterized in that: A second screw drive (24) has a second threaded spindle (26) rotatably mounted on a base body (25) and having the coupling section (23), and a second threaded nut (28) rotatably mounted on the second threaded spindle (26) and non-rotatably mounted on the base body (25) via a supporting unit (27).

4. Mechanical force amplifier according to at least one of the preceding claims, characterized in that The second threaded spindle (26) has a smaller pitch than the first threaded spindle (7) of the handheld pulling and compressing device (1).

5. Mechanical force amplifier according to at least one of the preceding claims, characterized in that A coupling element (29), which can be connected to the tool holder (10), is used to transmit tensile and compressive forces generated by the rotational direction of the second threaded spindle (26) from the second threaded nut (28) to the tool holder (10).

6. Mechanical force amplifier according to at least one of the preceding claims, characterized in that The connecting section (20) of the force amplifier (19) has a thread or a latch body for detachably fixing to the connecting section (21) of the pulling and compression device (1) having a thread or a latch body receiving portion.

7. A hand-held pulling and compressing device for driving interchangeable tools, having - a drive unit (4) comprising a battery-operated electric motor (3), a first threaded drive (5) having a first threaded spindle (7) rotatably mounted on a housing (6) and a first threaded nut (9) rotatably mounted on the first threaded spindle (7) and non-rotatably mounted on the housing (6) via a bearing unit (8), and a coupling unit (11) connectable to a tool holder (10) for transmitting tensile and compressive forces resulting from the rotational direction of the first threaded spindle (7) from the first threaded nut (9) to the tool holder (10), It is characterized in that A mechanical force amplifier (19) detachably connectable to the pulling and compressing device (1) according to at least one of claims 1 to 6.

8. The handheld pulling and compressing device according to claim 7, characterized in that: The first threaded spindle is designed as a hollow spindle (7) for receiving a rotating shaft (12) connected to the drive unit (4), and the mechanical force amplifier (1) is connected to the rotating shaft (12) via a coupling section (23).

9. The handheld pulling and compressing device according to claim 7 or 8, characterized in that: The switching unit (13) is capable of adjusting between a connection state in which the first threaded spindle (7) is connected to the drive unit (4) and a disconnection state in which the first threaded spindle (7) is disconnected from the drive unit (4).

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