WO2016016747A1

WO2016016747A1 - Device for removing connecting elements from workpieces

Info

Publication number: WO2016016747A1
Application number: PCT/IB2015/054948
Authority: WO
Inventors: Christian Steinbrunner; Josef Häringer
Original assignee: Christian Steinbrunner; Josef Häringer
Priority date: 2014-07-30
Filing date: 2015-07-01
Publication date: 2016-02-04
Also published as: DE102014110784A1

Abstract

A device (1) for removing connecting elements (10) from workpieces (12) is disclosed. Two counter-rotating motor-driven tools (5) consisting of a receiving element (8) and a truncated cone (9) are disposed on a bearing housing (7) in such a way that axes of rotation (4) of the tools (5) define an acute angle (α), and a generating line (6) of one of the truncated cones (9) runs substantially parallel to a generating line (6) of the other truncated cone (9).

Description

Device for removing connecting elements from workpieces

The present invention relates to a device for removing fasteners from workpieces. In particular, the device has two tools rotatable about a respective axis of rotation. The tools each have a truncated cone, which enclose an acute angle. A generatrix of one of the truncated cones is substantially parallel to a generatrix of the other truncated cone.

The patent DD 238 763 A1 discloses a nail-pulling apparatus which has a claw for removing nails which can be driven into the wood by a firing pin next to the nail head. With the nail-pulling device nails of different sizes can be pulled out. A locking claw has an elongated lever arm with a convex curved support surface. From the end of the lever arm, a connecting element is guided to an axially displaceable retaining bush located on the lever tube. The application of the nail-pulling device takes place in particular on construction sites or demolition objects.

The German patent DE 41 9137 discloses a nail puller with straight guided pliers. With a vertically movable in a carriage pliers nail head is detected. About an angle lever, the pliers with the detected nail is guided vertically upwards and thus pulls out the nail.

The German utility model DE 16 60 480 discloses a device for removing nails and similar fastening means. The nail-pulling device consists of two legs, one of the legs is hinged to the other and carries at its rear end a handle. The non-linear arm carries at its end a freely rotatable support roller over which the nail puller can be pivoted to pull the nails. The German utility model DE 1 782 197 also describes a nail-pulling device which can be operated with muscular strength.

German laid-open specification DE 25 354 82 discloses a nail puller which is provided with a pair of jaws which, under the influence of a pressure medium, grip the nail to be pulled out. Also, a movable under a pressure medium piston is provided, which ultimately pulls the nail from the workpiece.

The German patent application DE 32 19 936 discloses a nail extracting device in which extension jaws with gripping members for detecting the nail head are arranged at the head of a holder axially slidably inserted into a pulling sleeve. There are three arranged at an angular distance of 120 ° from each other and radially mutually movable extension jaws are provided, the gripping members are spread in the non-working position by a spring-loaded stylus. A beater bar is associated with the bracket and causes its downward movement to bring the gripping members of the extension jaws along the feeler pin in working position. To pull out the nail with the help of comprehensive nail head gripping members, the tension sleeve and the holder are pulled upwards. The operations may possibly be performed manually, pneumatically, hydraulically or electrically.

German Auslegungsschrift DE 1 127 827 discloses a tool for removing fastening pins. With the front, beveled ends of the support arms, for example, a nail can be detected and lifted from the board. Only one of the rollers is driven. To remove the nail two rollers are removed from each other via the support arms, so that the nail gets between the rollers. By compressing the rollers and the non-driven roller is rotated and finally pulled out the nail. U.S. Patent 5,595,369 describes a tool for extracting nails. The tool can be fitted with various inserts to aid in the removal of nails. One of the inserts is provided with a conical roller so that the nails to be pulled out can be clamped. Furthermore, the roller has several teeth, which also support the extraction of the nails. A disadvantage is that the nails must first be lifted out of the workpiece before they are completely removed with the tool by means of the insert.

The invention has for its object to provide a device for removing fasteners from workpieces that removes a variety of types of fasteners from workpieces, thereby reducing the damage of the workpiece to a minimum without special effort.

The object is achieved by a device comprising the features of claim 1. Advantageous developments are the subject of the dependent claims.

The device according to the invention for removing connecting elements is characterized in that two motor-driven and counter-drivable tools are provided. The tools consist of a receiving element and a truncated cone. Furthermore, the tools are arranged on a bearing housing such that axes of rotation of the tools enclose an acute angle and the generatrices of the truncated cones are substantially parallel.

The arrangement of the tools which can be driven in opposite directions has the advantage that the receiving elements of the tools grasp the connecting element in the workpiece and the truncated cones pull the connecting element further out of the workpiece without having a significant influence on the workpiece itself. According to a possible embodiment, the receiving element may be formed as a cone which is releasably secured to the truncated cone. According to a further embodiment, the receiving element may be formed as a dome, which may also be releasably secured to the truncated cone.

Each tool has a shaft which extends in the bearing housing and is rotatably supported in a bearing bush and in a drive bushing. From a gearbox of the device according to the invention, an output shaft extends between the shafts of the tools. The two drive bushes are coupled in such a way via a connection that the drive bushes are pivotable about an axis of the drive shaft. The advantage of this pivoting is that it achieves a substantially parallel arrangement of the generatrices of the truncated cones of the tools, so that there is a defined and uniform gap along the truncated cones, in which the connecting element can be reliably and reliably detected and pulled out of the workpiece ,

The output shaft has a threaded portion which cooperates with a corresponding threaded portion of each drive bushing. This ensures that the two tools are driven in opposite directions. The output shaft is mounted in the bearing housing with roller bearings. Furthermore, in each case a shaft seal is provided at least on an outer wall of the bearing housing. The shaft seal ensures that the interior of the bearing housing is sealed against dirt.

Each bushing for each shaft of the tool is associated with an adjustable biasing element. By the biasing element, the tools are biased against each other in a direction substantially perpendicular to the axes of rotation of the tools. Due to the bias is advantageously achieved that the two tools press from the left and from the right onto the connecting element, so that it can be reliably detected under a certain force and removed from the workpiece. In addition, the compressive force of the tools can be adjusted according to the fasteners to be removed.

The device further comprises a drive housing in which a motor and a transmission are provided. A drive shaft extending from the engine is coupled to the transmission. The engine is designed as an electric motor. It can be powered by a conventional power cord from a power outlet with the power required for the engine. It is also conceivable that the engine is operated on battery power. It can be connected to the device a suitably trained accumulator.

The tools themselves are inventively designed such that the truncated cone of each tool has incorporated a helix. The helix lies below a level of the envelope of the truncated cone. The helix itself opens into a radially encircling depression at the base of the truncated cone. The radial circumferential recess ultimately has the task to transport the connecting element vertically from the workpiece. Thus, with the device according to the invention described here any length of connecting elements can be removed from workpieces. In order to securely grasp the connecting elements, the radially encircling recess and at least part of the helical line of the truncated cone adjoining the radially encircling recess has a plurality of friction elements. The friction elements are dimensioned such that they are also below the level of an envelope of the truncated cone. According to one embodiment of the invention, the friction elements are formed as teeth. This has the advantage that a secure gripping of the connecting element is ensured by the friction elements or teeth.

According to one embodiment of the invention, the receiving element of the tool, which is a cone, carries a helix which starts at a tip of the cone and opens into the helix of the truncated cone. According to a further embodiment, the receiving element of the tool, which is a dome, has formed at least one wing having a bearing surface which is aligned with a helix of the truncated cone.

A particular advantage of the device according to the invention is that fatigue-free fasteners can be removed from workpieces. The connectors can z. As nails, screws, threaded rods, wires and the like. Due to the special design of the tools damage to the workpiece is largely avoided. Also z. As screws are removed, the screw heads are damaged so that a conventional unscrewing the screws is no longer possible.

In the following, embodiments of the invention and their advantages with reference to the accompanying figures will be explained in more detail. The proportions in the figures do not always correspond to the actual size ratios, as some shapes are simplified and other shapes are shown enlarged in relation to other elements for ease of illustration. Showing:

Figure 1A is a side view of an embodiment of the invention

Device in use when pulling out connecting elements;

Figure 1 B is an enlarged side view of the device according to the invention of Figure 1A in use when pulling out of connecting elements;

Figure 2 is a schematic side view of the device according to the invention in partial section;

Figure 3 shows an arrangement of the tool in the bearing housing;

Figure 4 is a plan view of the bearing housing of the device and the

Tools in the operative position; Figure 5 is a front view of the drive housing in connection with the bearing housing;

FIG. 6 shows an arrangement of the bearing bushes in the bearing housing;

Figure 7 is a schematic arrangement of the bushings in connection with the output shaft of the transmission;

Figure 8 is a side view of an embodiment of the receiving element of

Tool as a cone;

Figure 9 shows a further embodiment of the receiving element of the tool as a dome;

Figure 10 is a plan view of the tools, which has a dome according to the in

Figure 9 have shown embodiment and are in operative position with a connecting element;

Figure 11 is a front view of the embodiment of the tool of Figure 9 in

Operative position with the connecting element;

Figure 12 is a front view of the position of the truncated cones carrying friction elements and thus ultimately pulling the connector out of the workpiece;

Figure 13 is a side view of another embodiment of the device according to the invention in use when pulling out of connecting elements;

Figure 14 is a side view of an embodiment of the invention

Device in longitudinal construction;

Figure 15 is a side view of the bearing housing with a configuration for

Attachment of the crank;

Figure 16 is an illustration of the biasing elements and the means for adjusting the bias voltage; and Figure 17 is a plan view of the bearing housing of the device with another embodiment of the storage and adjustment of the tools.

For identical or equivalent elements of the invention, identical reference numerals are used. Furthermore, for the sake of clarity, only reference symbols are shown in the individual figures, which are required for the description of the respective figure. The illustrated embodiments merely represent examples of how the device according to the invention for removing connecting elements from workpieces can be configured.

Figure 1A shows a schematic side view of an embodiment of the device 1 for removing at least one connecting element 10 from a workpiece 12. The device 1 according to the invention essentially consists of a bearing housing 7 and a drive housing 27. The drive housing 27 is provided with a handle 50 which has a switch 52 for switching on the device 1. Further, a further handle 54 is provided on the drive housing 27, with which the device 1 can be pivoted under bearing the bottom 7U of the bearing housing 7 on the workpiece 12, so that with a leverage, the extraction of the connecting element 10 from the workpiece 12 is facilitated. The underside 7U of the bearing housing 7 can also serve as a bearing surface and abutment on the workpiece 12, so as to obtain a counterforce K _G for the tensile force K _z for the extraction of the connecting element 10 from the workpiece 12. Further, on the bearing housing 27, a magnet 55 may be attached, with which the remote from the workpiece 12 connecting elements 10 can be collected. This has the advantage that z. B. on the site no fasteners 10 lying around, which have been removed from workpieces 12. Thus, the risk of injury of workers on a construction site by the device 1 according to the invention is considerably reduced. By means of the counter-drivable tools 5, the connecting element 10 can be detected easily and without much effort and from the workpiece 12th be pulled out. The workpiece 12 moves upwards in the direction R shown in FIG. 1A and then experiences a component of movement K in the direction of the magnet 55 from which it is collected.

The illustrated in Figure 1 B enlarged side view of an embodiment of the device 1 according to the invention shows that the counter-drivable tools 5 each carry at a free end 3, a receiving element 8, which is formed in this embodiment as a cone. Each of the two cones 8 has a tip 8A formed, which drill on both sides of the connecting member 10 in the surrounding workpiece 12. The tools 5 consist of a truncated cone 9, which faces away from the receiving element 8, with the respective truncated cone 9 connects to the bearing housing 7. The connecting element 10 is finally pulled out of the workpiece 12 by the interaction of the two truncated cones 9 of the tools 5 in the pulling direction T10. To assist the extraction, the device 1 can be pivoted in a pivoting direction W on the workpiece 12.

Figure 2 shows a side view of the device 1 according to the invention for removing fasteners 10 from workpieces 12. Here, the bearing housing 7 and the drive housing 27 is shown in partial section to illustrate the internal structure of the bearing housing 7 and the drive housing 27. In the drive housing 27, a motor 28 is housed, the z. B. can be powered by an accumulator 37 with power. Furthermore, it is also conceivable to supply the motor 28 directly with electrical current via a corresponding power line. From the motor 28, a drive shaft 29 leads to a transmission 17. With a partition wall 24, the transmission 17 is disconnected from the motor 28. The handle 50 is provided with a switch 52, via which the motor 28 can be set in motion, which ultimately puts the gear 17 and the tools 1 connected to the device 5 in motion. The bearing housing 7 carries, as described in Figure 1, two motor and counter-drivable tools 5. The tools 5 are in a hollow shaft 14 is supported, which extends in the bearing housing 7 and thereby rotatably supported in a bearing bush 15 and a drive bush 16.

Figure 3 shows a plan view of the holder of the tool 5 in the hollow shaft 14. The tool 5 has a pin 11 is formed, which is inserted into the hollow shaft 14 and cooperates with this form-fitting manner, for. B., the pin 11 may be formed as a polygon, which is inserted into a corresponding inner shape of the hollow shaft 14 and thus cooperates with this form-fitting manner. On a receiving element 8 (cone here) or truncated cone 9 opposite end 5E of the tool 5, the drive bush 16 is provided which supports the hollow shaft 14 with a plurality of roller bearings 39. The hollow shaft 14 has a thread 22 which cooperates to drive the tool 5 with an output shaft 13 from the gear 17.

Figure 4 shows a sectional view of the bearing housing 7, so as to illustrate the assembly and arrangement of the tools 5 in the bearing housing 7. The hollow shaft 14 of each tool 5 is rotatably mounted in a bearing bush 15 and a drive bush 16. The two drive bushes 16 are connected to each other with a connecting element 18 such that they are pivotable about an axis 13A of the output shaft 13. Furthermore, the hollow shafts 14 are each still stored in a bearing bush 15. In addition, on each of the bushings 15, a biasing member 19 acts whose bias can be adjusted with an adjustment 19E such that the two tools 5 are biased in a direction substantially perpendicular to the axes of rotation 4 of the two tools 5 direction 26 against each other. With the output shaft 13 in cooperation with the drive bushing 16, the two tools 5 can be driven in a mutually opposite direction. The axes of rotation 4 of the tools 5 are under an acute

Angle α arranged so that generatrices 6 of the truncated cones 9 are substantially parallel. The adjustment of the bias of the two tools 5 with the biasing member 19 is of considerable advantage, since thereby the force with which the two tools 5 detect a to be removed fastener 10, can be adjusted. Likewise, the pivotability of the drive bushes 16 about the axis 13A of the output shaft 13 is advantageous, since thereby the position of the two tools 5 to each other in dependence on the to be removed from a workpiece 12 connecting elements 10 can be adjusted. In the event that z. B. a relatively thick connecting element 10 must be removed from a workpiece 12, it is necessary that the two truncated cones 9 of the tools 5 have a slightly greater distance from one another, so that the connecting element 10 can be detected according to the operation of the device 1. Similarly, the adjustment of the bias ensures safe removal of the connecting element 10 from the workpiece 12. To release the tools 5 from the device 1, an eccentric 60 is provided.

Figure 5 shows a sectional view of the bearing housing 7 and the bearing housing 7 associated drive housing 27. From the bearing housing 7, the output shaft 13 leads into the bearing housing 7. The output shaft 13 is disposed in the bearing housing 7 between the two drive bushings 16 for the storage of the hollow shaft 14. In the area between the drive bushes 16, the output shaft 13 has a threaded portion 20 which cooperates with a corresponding thread 22 of each hollow shaft 14. As a result, the two tools 5 can be driven in opposite directions about the axis of rotation 4 mentioned in FIG. The two drive bushes 16 are connected to each other via a connecting element 18, so that the pivoting of the drive bushes 16 is given. The output shaft 13 is mounted in the bearing housing 7 with bearings 64. Further, the output shaft 13 is provided with at least one shaft seal 62 so as to seal the inside of the bearing housing 7 against external influences (such as soiling, wetness, dust, etc.). Each of the hollow shafts 14 has formed a polygon 66 for attachment of the tool 5, with the the correspondingly shaped pin 11 of the tool 5 cooperates positively.

Figure 6 and Figure 7 show schematically the interaction of the drive bushes 16 with the output shaft 13. The output shaft 13 is disposed between the drive bushes 16. The threaded portion 20 of the output shaft 13 engages through a radial recess of each drive bush 16, so that the threaded portion 20 of the output shaft 13 with a thread 22 of the hollow shaft 14 (see Figure 3) can cooperate. Through the interaction of the threaded portion 20 with the thread 22, an opposite rotation D16 of the hollow shafts 14 (see FIG. 3) in the drive bushes 16 is achieved on rotation D13 of the output shaft 13 about its axis 13A. FIG. 7 also shows the biased direction 26 of the prestressing in order to keep the drive bushes 16 or the hollow shafts 14 (see FIG. 3) mounted in the drive bushes 16 in permanent operative contact with the output shaft 13.

The connecting element 18 supports the drive bushes 16 via roller bearings 64 on the output shaft 13. By the connecting element 18 and the roller bearings 64, it is possible that the drive bushes 16 can perform a pivoting movement S16 about the axis 13A of the output shaft 13.

FIG. 8 shows a first embodiment of the tool 5. The truncated cone 9, at the base 34 of which the pin 11 adjoins, has incorporated a helix 31. The helix 31 terminates in the region of the base 34 of the truncated cone 9 in a radially circumferential recess 32. The helix 31, as well as the radial circumferential recess 32, are below the level of an envelope 38 of the truncated cone 9. The radially encircling recess 32 and at least one Part of the adjoining the radial circumferential recess 32 helix 31 of the truncated cone 9 is provided with friction elements 36. The friction elements 36 of Figures 8 and 9 may be formed according to a preferred embodiment as teeth. These teeth 36 may be made of suitably hardened material to conform to can dig out of the workpiece 12 to be pulled out of the connecting element 10, thus ensuring an effective extraction of the connecting element 10.

Figure 8 shows a specific embodiment of the receiving element 8 of the tool 5. The receiving element 8 is a cone and carries a helical line 41 which starts at a tip 40 of the cone 8 and opens into the helix 31 of the truncated cone 9. It should also be noted that an envelope 45 of the cone 8 of the tool 5 has a greater inclination with respect to the axis of rotation of the tool 5 than the surface line 6 of the truncated cone 9.

Figure 9 shows a further embodiment of the receiving element 8 of the tool 5. The receiving element has the shape of a dome, wherein the dome of the tool 5 has formed at least one wing 42 having a support surface 44. The bearing surface 44 of the dome is aligned with a helical line 31 of the truncated cone 9. Only in this way can it be achieved that a connecting element 10 which is removed from a workpiece 12 is transferred seamlessly from the cone 8 into the helix 31 of the truncated cone 9. The embodiment of the tool illustrated in FIG. 9 is suitable for removing fasteners 10 (nails) from nail binders. The receiving elements 8 described in FIGS. 8 and 9 can be made detachable from the truncated cone 9. This has the advantage that the receiving elements 8, which are subject to wear, can be replaced. It is also possible, if necessary, to connect other types of receiving elements 8 with the truncated cone.

FIGS. 10 and 11 show the removal of a workpiece 10 with a tool 5, which is designed according to the embodiment shown in FIG. The device 1 is correspondingly attached to the area where the connecting element 10, which is to be removed from the workpiece 12, is attached. Upon rotation of the tools 5 about their axes of rotation 4 detect the bearing surfaces 44 of the wings 42 of the receiving elements I 8 (Dom) of the tool 5, the head 30 of the connecting element 10. Due to the opposite rotation D16 of the tools 5, the connecting element 10 is pulled out of the workpiece 12. Thus, the device 1 has a corresponding counterforce when pulling out of the connecting element 10, the bearing housing 7 rests on the workpiece 12.

Figure 12 further describes the extraction of the connecting element 10 with the friction elements 36 of the radial circumferential recess 32. After the head 30 of the connecting element 10 has been raised correspondingly far in the pulling direction T10, the connecting element 10 finally engages with the friction elements 36, are provided at least in the radial recess 32 of the truncated cone 9. As a result of the continuous rotation D16 of the tools 5 in the respective opposite direction, the friction elements 36 engage the connecting element 10 and lift the connecting element 10 in the pulling direction T10 out of the workpiece 12. In order to lift the connecting element 10 out of the workpiece 12, the sufficient force to apply, is exerted on the connecting element 10 via the tool 5 in the direction 26 directed toward each other prestressing force. Thus, it is also given that the friction elements 36 effectively pull the connecting element 10 out of the workpiece 12. According to a preferred embodiment, the friction elements 36 are formed as teeth that are hardened and thus can easily bite into the connecting element 10. Thus, the connecting element 10 can be pulled without slipping out of the workpiece 12.

FIG. 13 shows a side view of a further embodiment of the device 1 according to the invention in use when pulling out connecting elements 10. The adjoining the bearing housing 7 truncated cones 9 have the connecting element 10 detected. In the drive housing 27 of the engine (not shown) housed. The motor is powered by an accumulator 37, which is detachably mounted on the drive housing 27, with power. With the handle 54, the device 1 pivoted to support the extraction of the connecting elements 10. The handle 50 has a switch 52 which serves to turn on / off. In addition, there is a continuous operation button 51 and a forward / reverse switch 53. The eccentric 60 is used for pushing apart of the two tools 5 and truncated cones 9 after the biasing elements 19 (springs) are relaxed. The tools 5 can then be changed. The bearing housing 7 is provided with a cover 56 which allows access to the drive bushes 16. On the bearing housing 7, a crank 21 is further provided, with which the bias of the biasing members 19 can be adjusted. The crank 21 is rotatably attached to a lid 57 for this purpose. The helical line 31 is incorporated into the two truncated cones 9 in such a way that the helices 31 come to rest on each other where the two truncated cones 9 adjoin one another. Thus, the connecting element 10 can be inserted accurately into the helices 31.

Figure 14 shows a side view of an embodiment of the device 1 according to the invention in the longitudinal construction. To the bearing housing 7 close truncated cones 9 of the tools 5. On the bearing housing 7, the crank 21 is rotatably supported and extends in the longitudinal construction to the drive housing 27, which adjoins the bearing housing 7. As already mentioned, with the crank 21, the bias of the biasing elements (not shown here) can be adjusted. At the end of the drive housing 27, the accumulator 37 is seated. Likewise, at the end of the drive housing 27, the handle 50 is provided with the switch 52, which further comprises the continuous operation button 51. Likewise, the handle 54 and the magnet 55 is attached to the drive housing 27.

Figure 15 shows a side view of the bearing housing 7 with a configuration for attaching the crank 21. The crank 21 is connected to the lid 57 for access to the biasing members 19 via a tightening screw 58. A fixing 59 holds the crank 21 on the bearing housing 7 when the device 1 is in use and the crank 21 is not needed.

FIG. 16 shows an illustration of the biasing elements 19 and the adjusting elements 19E for adjusting the prestressing of the biasing elements 19. Each of the two biasing members 19 is a stack of leaf springs. The leaf springs are inserted into the adjusting element 19E. The adjusting member 19E has a thread 49, with which the adjusting member 19E can be screwed into a thread 48 of the lid 57 when it is mounted on the bearing housing 7. By the degree of screwing the bias of the biasing members 19 can be adjusted. The biasing elements 19 act on the bearing bush 15, so that the two tools 5 are braced against each other. Each tool 5 is further guided in the drive bush 16.

Figure 17 shows a plan view of the bearing housing 7 of the device 1 with another embodiment of the bearing bush 15 and the adjustment of the bias of the tools 5. The bearing bush 15 is formed as a flat needle bearing over which the hollow shaft 14 is mounted. In the hollow shaft 14, the pin 11 of the tools is held positively. The elastic biasing member 19 (here, a spring member) presses on the hollow shaft 14 via the bearing bushing 15. The pressing force of the biasing member 19 can be adjusted via the adjusting element 19E (here screw).

LIST OF REFERENCE NUMBERS

contraption

free end

axis of rotation

Tool

E end of the tool

generating line

bearing housing

A Outer wall of bearing housingU Bottom of bearing housing

Pickup element, cones, DomA tips of cones

truncated cone

0 connecting element

1 pin

2 workpiece

3 output shaft

3A axis of the output shaft

4 hollow shaft

5 bearing bush

6 drive socket

7 gears

8 connecting element

9 biasing element

9E adjustment element

0 threaded section of the output shaft1 crank

2 thread of the hollow shaft 24 partition wall

26 direction

27 drive housing

28 engine

29 drive shaft

30 head

31 helical line

32 circumferential recess

34 base

36 friction elements

37 accumulator

38 envelopes

39 rolling bearings

40 tip

41 helical line

42 wings

44 bearing surface

45 envelopes

48 threads

49 thread

50 handle

51 Continuous operation button

52 switches

53 forward / reverse switch

54 handle

55 magnet

56 Lid

57 Lid for access to preload element

58 tightening screw

59 fixation 60 eccentrics

62 shaft seal

64 rolling bearings

66 polygon

angle

D13 rotation

D16 Opposing rotation

K movement component

K _G counterforce

Κζ traction

R Direction of movement of the workpiece

S16 pivoting movement

Τ10 pulling direction

W pivot direction

Claims

claims

1 . Device (1) for removing connecting elements (10) from workpieces (12), wherein two tools (5) which are rotatable around a respective rotation axis (4) and each having a truncated cone (9) enclose an acute angle (a) and a surface line (6) of one of the truncated cones (9) is substantially parallel to a surface line (6) of the other truncated cone (9), characterized in that a respective receiving element (8) is attached to each truncated cone (9); each truncated cone (9) of each tool (5) has incorporated a helical line (31) which opens into a radially encircling recess (32) on a base (34) of the truncated cone (9).

2. Device according to claim 1, wherein the receiving element (8) is a cone.

3. A device according to claim 2, wherein the cone (8) of each tool (5) carries a helical line (41) which starts at a tip (40) of the cone (8) and into the helix (31) of the truncated cone (9 ) opens.

4. The device according to claim 1, wherein the receiving element (8) is a Domist.

5. Apparatus according to claim 4, wherein the dome (8) of the tool (5) has formed at least one wing (42) having a bearing surface (44) which is aligned with a helix (31) of the truncated cone (9).

6. Device according to one of the preceding claims, wherein a hollow shaft (14) of each tool (5) in a bearing housing (7) in a bearing bush (15) and in a drive bushing (16) is rotatably supported and an output shaft (13) between the drive bushes (16) sits, so that the two tools (5) motor and counter-rotating are drivable.

Device (1) according to one of the preceding claims, wherein each tool (5) comprises a pin (11) via which it is mounted in the hollow shaft (14) which extends in the bearing housing (7) and in a bearing bush (15 ) and in a drive bush (16) is rotatably supported.

8. The device (1) according to claim 7, wherein the drive bushes (16) are coupled via a connection (18) such that the drive bushes (16) and an axis (13A) of the output shaft (13) are pivotable and the output shaft (13 ) has a threaded portion (20) formed, which cooperates with a corresponding thread (22) of each hollow shaft (14), so that the tools (5) are driven in opposite directions.

9. Device (1) according to one of the preceding claims, wherein the output shaft (13) in the bearing housing (7) with rolling bearings (64) is mounted and sealed at least on an outer wall (7A) of the bearing housing (7) with a shaft seal (62) is.

10. Device (1) according to one of the preceding claims, wherein an adjustable biasing element (19) of the bearing bush (15) is associated, so that the two tools (5) in a substantially to the axes of rotation (4) of the tools (5). vertical direction (26) are biased against each other.

11. Device (1) according to claim 1, wherein the radially encircling recess (32) and at least part of the helical line (31) of the truncated cone (9) adjoining the radial circumferential recess (32) are provided with friction elements (36) and the friction elements (36) are formed such that they do not project beyond an envelope (38) of the truncated cone (9).

12. Device (1) according to claim 11, wherein the friction elements (36) as Teeth are formed.

Device (1) according to one of the preceding claims, wherein an underside (7U) of the bearing housing (7) serves as a bearing surface on the workpiece (12), so that a counterforce for pulling out of the connecting element (10) from the workpiece (12) is formed is.