Hand-held Pulling and Compressing Device

Abstract

The invention relates to a hand-held pulling and compressing device for driving interchangeable tools, with a drive unit with a battery operated electric motor, a screw drive with a threaded spindle connected to the electric motor and mounted rotatably on a housing body and a threaded nut mounted rotatably on the threaded spindle and non-rotatably 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.

In order to provide a hand-held pulling and compressing device that is reliably and flexibly suitable for driving interchangeable tools, it is provided that the screw drive is designed to transmit rotational movements of the threaded spindle to a second tool holder.

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) and non-rotatably on the housing body (6) via a bearing unit (8), 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, 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 claim 1, 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 claim 1, 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 claim 1, 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 claim 1, 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 claim 1, 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 claim 1, 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 claim 1, characterized by a control unit (29) connected to at least one sensor unit (31, 32) for controlling and/or archiving the operating processes.

Description

[0043] An embodiment of the invention is explained below with reference to the drawings. The drawings show:

[0044] FIG. 1 a perspective view of a hand-held pulling and compressing device with a first tool holder;

[0045] FIG. 2 a sectional view of the pulling and compressing device of FIG. 1;

[0046] FIG. 3 a perspective view of the pulling and compressing device of FIGS. 1 and 2 with a connected rivet clamp;

[0047] FIG. 4 a sectional view of the pulling and compressing device of FIGS. 1-3 with a second tool holder.

[0048] FIG. 1 shows a perspective view of a pulling and compressing device 1 with a drive unit 4 comprising an electric motor 3 and a gear 35 connected to the electric motor 3. A threaded spindle 7 of a screw drive 5 connected to the gear 35 is driven by means of the electric motor 3 via the gear 35, the threaded spindle 7 being rotatably mounted in a bearing seat 36 of a housing body 6 (see FIG. 2).

[0049] In addition to the threaded spindle 7, the screw drive 5 also has a threaded nut 9 arranged on the threaded spindle 7 and mounted non-rotatably 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 seat 33 in the longitudinal axis direction of the threaded spindle 7, i.e. in the direction of the threaded spindle axis G, so that punch riveting operations can be carried out by means of the pulling and compressing device 1 via a connected rivet clamp 2 (see FIG. 3).

[0050] The piston rod 10 is connected to the threaded nut 9 via a detachably connected coupling unit 11, which bears against a second end face 14 of the threaded nut 9 at its end opposite the piston rod 10. To prevent rotation of the coupling unit 11 relative to the threaded nut 9, the coupling unit 11 also has projections 34 on its contact surface with the second end face 14 of the threaded nut 9, which engage in recesses on the second end face 14 of the threaded nut 9.

[0051] A connecting element 12 is used to transmit the linear movement generated by the threaded nut 9 to the coupling unit 11. This has a first connecting section 15 bearing 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 to project 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 in a cage-like manner.

[0052] Compressive movements, i.e. adjusting 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. 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 bearing against 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.

[0053] 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 journal 19 aligned perpendicular to the threaded spindle axis G and projecting from the coupling unit 11, on which a bearing roller 21 is rotatably arranged. The bearing roller 21 is supported by two sections arranged adjacent 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 the bearing roller 21 rolls on the inner surfaces 24 during an adjusting movement of the threaded nut 9 in the direction of the threaded spindle axis G. 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 non-rotable connection of the coupling unit 11 to the threaded nut 9 are supported on the housing body 6.

[0054] As shown in FIG. 4, the screw drive 5 is designed to transmit rotational 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 fit 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 polygon-shaped cross-section extending in the direction of the threaded spindle axis G. The coupling unit 11 has a sleeve-like design, i.e. the coupling unit 11 has a free area formed as a through opening 28 for the second tool holder 25 to pass through.

[0055] A control unit 29 for controlling and/or archiving the operating processes is also arranged on the hand-held pulling and compressing device 1. The control unit 29 is connected to an actuating element 30 and a rotation sensor 31 for detecting the torque of the electric motor 3 and a force sensor 32 for detecting the tensile and compressive forces of the piston rod 10.

[0056] To arrange the second tool holder 25 on the threaded spindle 7, the piston rod 10 is first released 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 shaped section 27 is connected to the recess 26 to form a positive fit with the threaded spindle 7.

[0057] All the features explained in connection with individual embodiments of the invention may be provided in different combinations for the hand-held pulling and compressing device in order to realize their advantageous effects, even if these have been described for different embodiments.

[0058] The scope of protection 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

[0059] 1 pulling and compressing device [0060] 2 rivet clamp [0061] 3 electric motor [0062] 4 drive unit [0063] screw drive [0064] 6 housing body [0065] 7 threaded spindle [0066] 8 bearing unit [0067] 9 threaded nut [0068] first tool holder/piston rod [0069] 11 coupling unit [0070] 12 connecting element [0071] 13 first end face (threaded nut) [0072] 14 second end face (threaded nut) [0073] first connecting section (connecting element) [0074] 16 second connecting section (connecting element) [0075] 18 sleeve section (connecting element) [0076] 19 bearing journal [0077] 20 coupling section (coupling unit) [0078] 21 bearing roller (one roller) [0079] 22 elongated hole/guide [0080] 24 inner surface/section of the housing base body [0081] 25 second tool holder [0082] 26 recess [0083] 27 shaped section [0084] 28 through opening/free area [0085] 29 control unit [0086] 30 actuating element [0087] 31 rotation sensor [0088] 32 force sensor [0089] 33 bearing seat [0090] 34 head start [0091] 35 gear [0092] 36 bearing seat [0093] G threaded spindle axis