EP0623422B1 - Electrical tool - Google Patents

Electrical tool Download PDF

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Publication number
EP0623422B1
EP0623422B1 EP94106314A EP94106314A EP0623422B1 EP 0623422 B1 EP0623422 B1 EP 0623422B1 EP 94106314 A EP94106314 A EP 94106314A EP 94106314 A EP94106314 A EP 94106314A EP 0623422 B1 EP0623422 B1 EP 0623422B1
Authority
EP
European Patent Office
Prior art keywords
tool
drive
drive shaft
switch
switching
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP94106314A
Other languages
German (de)
French (fr)
Other versions
EP0623422A1 (en
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
C&E Fein GmbH and Co
Original Assignee
C&E Fein GmbH and Co
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority to DE4314799 priority Critical
Priority to DE19934314799 priority patent/DE4314799C2/en
Application filed by C&E Fein GmbH and Co filed Critical C&E Fein GmbH and Co
Publication of EP0623422A1 publication Critical patent/EP0623422A1/en
Application granted granted Critical
Publication of EP0623422B1 publication Critical patent/EP0623422B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B24GRINDING; POLISHING
    • B24BMACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B23/00Portable grinding machines, e.g. hand-guided; Accessories therefor
    • B24B23/04Portable grinding machines, e.g. hand-guided; Accessories therefor with oscillating grinding tools; Accessories therefor
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B24GRINDING; POLISHING
    • B24BMACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B23/00Portable grinding machines, e.g. hand-guided; Accessories therefor
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B24GRINDING; POLISHING
    • B24BMACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B23/00Portable grinding machines, e.g. hand-guided; Accessories therefor
    • B24B23/02Portable grinding machines, e.g. hand-guided; Accessories therefor with rotating grinding tools; Accessories therefor
    • B24B23/03Portable grinding machines, e.g. hand-guided; Accessories therefor with rotating grinding tools; Accessories therefor the tool being driven in a combined movement

Description

  • The invention relates to a power tool with an oscillation drive for tools with a motor-driven drive shaft which can be coupled via an oscillation drive to a tool drive shaft for driving a tool in such a way that the tool is driven to oscillate about a pivot axis.
  • Such a power tool is known from EP-0 244 465 B1.
  • In the known power tool, a grinding tool, which preferably has a polygonal, in particular triangular, working surface, can be driven to oscillate about a pivot axis with a high frequency and a small pivot angle.
  • Such a grinding tool is particularly suitable for grinding in corner areas and in areas that are difficult to access.
  • In contrast, grinding devices are usually used for grinding larger surfaces, the grinding tool of which is driven eccentrically rotating. Such grinding devices are known under the name "eccentric grinder" and are widely used. The grinding tool usually has the shape of a grinding plate.
  • EP-0 525 328 A1 has also disclosed an eccentric grinder whose grinding plate is driven via a rotating drive motor and an eccentric without forced rotation. The grinding plate can be fixed to the housing at one point in such a way that a rotational movement of the grinding plate is prevented without hindering its eccentric displacement. As a result, the random orbit sander performs an oscillating or vibrating movement in this position.
  • Such an eccentric grinder is suitable for grinding larger areas, but such a grinding device is only suitable to a limited extent after switching to the vibration movement for grinding along longitudinal edges or in corner areas.
  • The invention is therefore based on the object of providing an electric tool which is as versatile as possible. In particular, an electric tool of the type mentioned at the outset is to be improved in such a way that grinding along longitudinal edges and in corner areas and flat machining of large grinding surfaces is made possible.
  • According to the invention, this object is achieved in that a rotary drive is provided in an electric tool of the type mentioned above, via which the drive shaft can be coupled to the tool in such a way that the tool is driven in rotation such that a switching element interacting with the oscillating drive and the rotary drive has at least two switching positions is provided that in a first switching position of the switching element the oscillation drive is coupled to the tool for the oscillating drive of the tool about a pivot axis, and that in a second switching position of the switching element the rotary drive is coupled to the tool for rotating the tool.
  • According to the invention, this creates the possibility of combining the advantages of an oscillation drive for the oscillating drive of a tool about a pivot axis with the advantages of a rotating drive for a tool. In this way, one and the same grinder can be used to work optimally along longitudinal edges, in corner areas and in other hard-to-reach places, while at the same time after switching the switching element into the second switching position, the power tool can be driven in a rotating manner. In the second switch position, the power tool can Thus, for example, they can be used as angle grinders with a grinding wheel or cutting disc in order to carry out rough grinding work or cutting work, while in the first switching position, fine grinding work is possible in places that are difficult to access. Since the advantages of two different power tools are combined in one power tool in this way, this leads to considerable cost savings and makes it possible to use a common universal tool instead of two different power tools.
  • In a preferred embodiment of the invention, the drive shaft is coupled to the tool drive shaft in the first switching position and, in the second switching position, is coupled to a tool holder for rotating the tool via the rotary drive.
  • While it would in principle be possible to provide a common holder for receiving the tool for an oscillating or rotating drive, either the tool drive shaft in the first switching position is coupled to the drive shaft for the oscillating drive or the drive shaft in the second switching position of the switching element coupled to the tool holder via the rotary drive in order to drive the tool in rotation. If the tool is to be driven in rotation, it is therefore to be held on the tool holder, but if it is to be driven in an oscillating manner, it is to be held on the tool drive shaft.
  • In an advantageous development of the invention, the tool drive shaft is oriented perpendicular to the drive shaft, the oscillation drive comprises an eccentric element which is connected to the drive shaft in a rotationally fixed manner and one with the tool drive shaft rotatably connected pivot element, and the pivot element is driven in the first switching position of the switching element by the eccentric element such that the tool drive shaft is moved oscillating about its pivot axis at a high frequency and small pivot angle.
  • This measure has the advantage that the oscillation drive can be implemented in a particularly simple and inexpensive manner.
  • In a further advantageous embodiment of the invention, a drive pinion with the drive shaft and a driven wheel with the tool holder are connected in a rotationally fixed manner, the drive pinion meshing with the driven wheel in the second switching position of the switching element in order to drive the tool holder rotating about its longitudinal axis while the pivoting element is not in operative connection with the eccentric element of the drive shaft.
  • This measure has the advantage that the rotating drive of the tool can also be implemented in a particularly simple manner.
  • In a further embodiment of the invention, the tool holder is coaxial with the tool drive shaft and is rotatably supported relative to the latter.
  • This results in a simple and space-saving construction.
  • In an additional development of the invention, the tool holder is connected in a rotationally fixed manner to the driven wheel via a hollow shaft rotatably mounted on the tool drive shaft.
  • This also simplifies the design of the arrangement according to the invention. The hollow shaft can be rigidly and non-rotatably connected to the tool holder and the driven gear, for. B. be screwed or be integrally formed.
  • According to a further feature of the invention, the tool holder carries a holder, which is offset with respect to the longitudinal axis of the tool drive shaft, for receiving the tool in order to drive the tool in the second switching position of the switching element in an eccentrically rotating manner.
  • In this way, an additional eccentric movement can be superimposed on the rotational movement, so that the power tool can be used on the one hand as an eccentric grinder for advantageous grinding of large areas and on the other hand as an oscillating grinder for grinding along longitudinal edges, for grinding in corner areas and at other hard-to-reach places .
  • In a further embodiment of the invention, the tool drive shaft has a central holder, which is coaxial with the longitudinal axis of the tool drive shaft, for receiving the tool in order to drive the tool oscillating about the longitudinal axis.
  • According to this feature of the invention, two separate holders for the tool are provided on the tool drive shaft, which are laterally offset from one another, the one holder which runs through the longitudinal axis of the tool drive shaft being provided for receiving oscillatingly driven grinding tools, while the other is arranged laterally to this receptacle offset receptacle for holding an eccentrically rotating grinding tool is provided.
  • Basically, the switchover between the two drive types - oscillation drive or rotary drive - can be implemented in different ways.
  • However, it has proven to be particularly advantageous if the drive shaft is designed to be displaceable in the direction of its longitudinal axis in order either to connect the pivoting element to the eccentric element in the first switching position or to connect the drive pinion to the driven gear in the second switching position.
  • With such a configuration of the switching device between the two types of drive, a simple construction and a reliable switching possibility result.
  • In an additional development of the invention, the drive pinion is held in a rotationally fixed manner apart from the eccentric element by a space at the end of the drive shaft facing the tool drive shaft, and the switching element comprises a projection engaging in the space, by means of which the drive shaft can be displaced in the direction of its longitudinal axis.
  • This construction also simplifies the construction of the switching device between the two drive types and enables reliable switching.
  • In an additional development of the invention, the swivel element is designed as a swivel fork with two mutually opposite swivel arms, which are on the tool drive shaft is held in a rotationally fixed manner, the two swivel arms facing the drive shaft, a recess being formed between the two swivel arms, within which the drive pinion and the eccentric element can be displaced with the drive shaft, the two swivel arms in each case inward in the direction of the longitudinal axis of the drive shaft have facing sliding surface, the sliding surfaces in the first switching position enclosing the eccentric element from the outside and slidingly abut against it, and wherein the drive shaft in the second switching position is displaced towards the tool drive shaft such that the eccentric element can rotate freely within the recess while the The drive pinion meshes with the driven gear.
  • In this embodiment of the invention, the oscillation drive is thus realized in that the pivot element is guided with its two sliding surfaces from the outside on the eccentric element, as a result of which the oscillation element is set in oscillating movements around the tool drive shaft arranged perpendicular to the drive shaft when the eccentric element rotates. In this embodiment, the drive pinion and driven gear form a bevel gear transmission, as a result of which a reliably operating power transmission can be implemented in a known manner. In this embodiment, the oscillation drive is also extremely simple and reliable.
  • According to a further feature of the invention, the switching element can be locked in both switching positions.
  • In this way, it is avoided that the switching element can unintentionally detach during operation of the power tool and the switching process can thus be initiated in an undesirable manner during operation.
  • In an expedient development of the invention, the tool which is driven to rotate in the second switching position is a grinding disk, while the tool which is driven to oscillate in the first switching position is a grinding tool with a polygonal, in particular triangular, grinding surface.
  • Further advantages and features of the invention emerge from the following description of a preferred exemplary embodiment with reference to the drawing. Show it:
  • Fig. 1
    a longitudinal section through a power tool according to the invention in a simplified representation, wherein for the sake of clarity only the front area of the power tool with the switching device and the gear is shown, while the representation of the drive, which is known in any case, has been omitted;
    Fig. 1a
    a side view of a grinding tool, which can be used as an alternative to the grinding tool according to FIG. 1 in particular when the power tool is switched to a rotating drive and
    Fig. 2
    a top view of the angular gear and the oscillation drive from above in a highly simplified representation without housing and other details to explain the principle of the switching device between the oscillation drive and the rotating drive.
  • The power tool shown in Figures 1 to 2 is designed as a hand grinder and is generally designated by the number 10.
  • A drive shaft 14, which is driven by a drive, not shown, for example an electric motor, is arranged within a housing 17. A tool drive shaft 12 is arranged at right angles to the drive shaft 14, on the end of which protrudes outward from the housing 17, a tool 62 can be fastened which can be driven in an oscillating manner. A tool holder 48 is provided coaxially to the tool drive shaft 12, which surrounds the tool drive shaft 12 from the outside and likewise protrudes from the housing 17. The tool holder 48 has a holder 56 arranged eccentrically to the longitudinal axis 13 of the tool drive shaft for receiving an eccentrically rotating tool 64 (cf. FIG. 1a).
  • The rotary movement of the drive shaft 14, indicated by the arrow 16, about its longitudinal axis 15 can either be converted into a rotational movement of the tool holder 48 via an angular gear or into an oscillating pivoting movement of the tool drive shaft 12 via an oscillating gear.
  • The tool holder 48 comprises an outside of the housing 17 arranged receiving block 49 which is integrally connected to a hollow shaft 50 which projects into the housing 17 and is rotatably connected to an output pinion 26 of the oscillating gear in a manner not shown, z. B. is screwed. The hollow shaft 50 is rotatably mounted on the tool drive shaft by means of two bearings 19, 21. The tool drive shaft 12 is in turn mounted at one end by means of a bearing 18 directly on the housing 17, while at its other end it is held by the hollow shaft 50 which is rotatably mounted on the housing 17 by means of a bearing 20.
  • To switch the two drive options, a switching element is provided, which is designated overall by the number 30. In the first switching position of the switching element 30, which is indicated by the number 31, the oscillation gear, which will be described in more detail below, is operatively connected to the drive shaft 14 and the tool drive shaft 12 about their longitudinal axis 13 with a small swivel angle and high frequency (about 10,000 - 25,000 vibrations / min.) to oscillate. In the second switching position of the switching element 30, which is indicated by the dashed lines and the number 32, on the other hand, the bevel gear mechanism formed from a drive pinion 24 and the driven gear 26 is operatively connected to the drive shaft 14 and the tool holder 48. Therefore, in the second switching position 32 the tool holder 48 is driven to rotate about the longitudinal axis 13.
  • The drive shaft 14 is mounted at its end facing the tool drive shaft 12 in a bearing 22 in the direction of its longitudinal axis 15 and carries an eccentric element 28 which is connected to the drive shaft 14 in a rotationally fixed manner and with formation a space 44 in front of it, the drive pinion 24, which is designed as a bevel gear and which closes the drive shaft 14 in the direction of the tool drive shaft 12.
  • As can be seen in more detail in FIG. 2, the oscillation drive has a swivel element 66 which is rigidly and rotationally fixed with the tool drive shaft 12, for. B. is connected by a pin connection 67, and which comprises two pivot arms 68, 70 which face the drive shaft 14. A recess 72 is formed between the two pivot arms 68, 70, within which the drive pinion 24 and the eccentric element 28 can be displaced in the direction of their longitudinal axis 15 by means of the drive shaft 14, as indicated by the arrow 78.
  • At the ends of the swivel arms 68, 70 there is provided a sliding surface 74, 76 that is directed inward to the longitudinal axis 15. In the first switching position 31, which is shown in solid lines in FIG. 1, the swivel element 66 with its two swivel arms 68, 70 engages around the eccentric element 28 from the outside such that the two sliding surfaces 74, 76 slide against the eccentric element 28 from the outside. If the drive shaft 14 is driven to rotate about its longitudinal axis 15, the rotational movement of the drive shaft 14 is therefore converted into an oscillating pivoting movement of the tool drive shaft 12 about its longitudinal axis 13. In this first switching position 31, the drive pinion 24 is spaced from the driven gear 26, so that the operative connection of the bevel gear mechanism is canceled.
  • In the second switching position 32, which is shown in dashed lines in Fig. 1 and extended in Fig. 2, on the other hand, the drive shaft 14 is displaced in the direction of the tool drive shaft 12 such that on the one hand the drive pinion 24 meshes with the driven gear 26 and on the other hand the eccentric element 28 can move freely within the recess 72 of the swivel element 66 without touching the swivel arms 68, 70. While the rotational movement of the drive shaft 14 is thus converted into a rotational movement of the tool holder 48, the operative connection of the oscillation gear is thus eliminated.
  • In order to switch between the oscillation drive of the tool drive shaft 12 and a rotating drive of the tool drive shaft 12, the drive shaft 14 is displaced in the direction of its longitudinal axis 15, as indicated by the arrow 78.
  • The switching element 30, by means of which the drive shaft 14 is displaced, has a slide 40 which is arranged on the outside of the housing and can be displaced parallel to the longitudinal axis 15. With the slider 40, an angle element 42 is connected, for. B. screwed, one leg protrudes into the interior of the housing 17 and is arranged perpendicular to the drive shaft 14. This leg has a projection 44 which projects into the space 46 formed between the drive pinion 24 and the eccentric element 28. When the slide 40 is displaced, the drive shaft with its drive pinion 24 and its eccentric element 28 is also displaced in the direction of its longitudinal axis 15.
  • In order to enable the drive shaft 14 to be fixed both in the first switching position 31 and in the second switching position 32, a locking lever 33 is provided which is pivotably fixed to the slide 40 and with a locking nose 34 located at its free end either in the first Switch position 31 engages in a groove 38 or in the second switch position 32 in a groove 36 on the housing 17.
  • At the outer end of the tool drive shaft 12, a central thread 52 is provided as a holder 58 for the tool 62, into which the tool 62 can be screwed by means of a threaded pin 60. It goes without saying that numerous fastening options for the tool 62 on the tool drive shaft 12 are of course possible, but these are not explained further here, since these are known to the person skilled in the art and are not part of the invention.
  • A holder 56 in the form of a threaded blind hole 54 is arranged in the receiving block 49 and is laterally offset with respect to the longitudinal axis 13 of the tool drive shaft 12 and the receiving block 49. A tool 64 inserted into this holder 56, which is indicated in FIG. 1 a, therefore not only performs a rotational movement when the tool holder 48 is rotating, but also an eccentric movement. The eccentricity depends on the radial distance between the longitudinal axis 13 and the receptacle 56.
  • The tool shown in FIG. 1 is designed as a grinding tool with a triangular grinding surface, the three outer edges of which are each convexly rounded outwards.
  • It goes without saying that any other tools and also shapes of the grinding surface can of course also be used. However, such a tool 62 is particularly suitable if it is driven in an oscillating manner in order to work along longitudinal edges, in corner areas or in other places that are difficult to access.
  • Alternatively, a larger grinding tool, for example in the form of a grinding plate, could be fastened to the tool holder 48 coaxially to the longitudinal axis 13, for which purpose a central thread (not shown) could be provided in order to drive the tool only in a rotating manner.
  • If, on the other hand, the tool 64, which is designed as a grinding plate according to FIG.
  • It goes without saying that, in addition, a suction device for extracting grinding dust can be provided if this is necessary or desired. Such a suction device was not shown, however, since it is known to the person skilled in the art and is not part of the invention.

Claims (14)

  1. Power tool, especially handheld sander, with an oscillation drive for tools with a motor-driven drive shaft (14) that can be coupled via an oscillation drive to a tool drive shaft (12) in order to drive a tool (62, 64) in such a way that the tool (62, 64) is driven in an oscillating manner about a pivot axis, characterized in that a rotary drive (24, 26) is provided by means of which the drive shaft (14) can be coupled to the tool (62, 64) in such a way that the tool (62, 64) is rotationally driven, in that a switching element (30) with at least two switch positions (31, 32), which interacts with the oscillation drive and the rotary drive, is provided, that in a first switch position (31) of the switching element (30), the oscillation drive is coupled to the tool (62, 64) to provide oscillating drive for the tool (62, 64) about a pivot axis, and in that in a second switch position (32) of the switching element (30), the rotary drive is coupled to the tool (62, 64) to provide rotational drive for the tool (62, 64).
  2. Power tool according to Claim 1, characterized in that in the first switch position (31), the drive shaft (14) is coupled to the tool drive shaft (12) via the oscillation drive to drive the tool in an oscillating manner, and in that in the second switch position (32), the drive shaft (14) is coupled, via the rotary drive (24, 26), to a tool receptacle (48) to drive the tool rotationally.
  3. Power tool according to Claim 1 or 2, characterized in that the tool drive shaft (12) is oriented perpendicular to the drive shaft (14), in that the oscillation drive comprises an eccentric element (28) attached non-rotatably to the drive shaft (14) and a pivot element (66) attached non-rotatably to the tool drive shaft (12) and in that in the first switch position (31) of the switching element (30), the pivot element (66) is driven by the eccentric element (28) in such a way that the tool drive shaft (12) is moved in an oscillating manner about its pivot axis, at high frequency and with a small pivot angle.
  4. Power tool according to Claim 1, 2, or 3, characterized in that a drive pinion (24) is attached non-rotatably to the drive shaft (14) and an output gear (26) is attached non-rotatably to the tool receptacle (48), and in that in the second switch position (32) of the switching element (30), the drive pinion (24) meshes with the output gear (26) in order to drive the tool receptacle (48) rotationally about its longitudinal axis (13), while the pivot element (66) is not in working engagement with the eccentric element (28) of the drive shaft (14).
  5. Power tool according to any one of the foregoing Claims, characterized in that the tool receptacle (48) is configured coaxially with the tool drive shaft (12), and mounted rotatably with respect thereto.
  6. Power tool according to Claim 4 or 5, characterized in that the tool receptacle (48) is non-rotatably attached to the output gear (26) by means of a hollow shaft (50) rotatably mounted on the tool drive shaft (12).
  7. Power tool according to one or more of the foregoing Claims, characterized in that the tool receptacle (48) carries a mount (56), offset from the longitudinal axis (13) of the tool drive shaft (12), to receive the tool (62), so as to drive the tool (62) in eccentric rotation about the longitudinal axis (13) in the second switch position of the switching element (30).
  8. Power tool according to one or more of the foregoing Claims, characterized in that the tool drive shaft (12) carries a central mount (58), coaxial with the longitudinal axis (13) of the tool drive shaft (12), to receive the tool (62) so as to drive the tool (62) in an oscillating manner about the longitudinal axis.
  9. Power tool according to one or more of the foregoing Claims, characterized in that the drive shaft (14) is designed to be displaceable along its longitudinal axis (15), so as either, in the first switch position (31), to bring the pivot element (66) into working engagement with the eccentric element (28) or, in the second switch position (32), to bring the drive pinion (24) into working engagement with the output gear (26).
  10. Power tool according to Claim 9, characterized in that the drive pinion (24) is held non-rotatably, next to the eccentric element (28) and spaced away from it by a gap (46), at the end of the drive shaft (14) facing the tool drive shaft (12), and in that the switching element (30) comprises a projection (44), engaging into the gap (46), by means of which the drive shaft (14) can be displaced along its longitudinal axis (15).
  11. Power tool according to one or more of the foregoing Claims, characterized in that the pivot element (66) is configured as a pivot fork, with two pivot arms (68, 70) lying opposite one another, and which is non-rotatably held on the tool drive shaft (12), such that the two pivot arms (68, 70) face the drive shaft (14), in that there is formed between the two pivot arms (68, 70) a recess (72) within which the drive pinion (24) and the eccentric element (28) can be displaced together with the drive shaft (14), in that each of the two pivot arms (68, 70) has a sliding surface facing (74, 76) inward toward the longitudinal axis (15) of the drive shaft (14), such that in the first switch position (31), the sliding surfaces (74, 76) surround the eccentric element (28) externally and are in sliding contact with it, and such that in the second switch position (32), the drive shaft (14) is displaced toward the tool drive shaft (12) so that the eccentric element (28) can rotate freely within the recess (72), while the drive pinion (24) meshes with the output gear (26).
  12. Power tool according to one or more of the foregoing Claims, characterized in that the switching element (30) can be locked in both switch positions (31, 32).
  13. Power tool according to one or more of the foregoing Claims, characterized in that the tool (62) that is driven rotationally in the second switch position (32) is a sanding disk.
  14. Power tool according to one or more of the foregoing Claims, characterized in that the tool (64) that is driven in an oscillating manner in the first switch position (31) is a sanding tool with a polygonal, in particular triangular, sanding surface.
EP94106314A 1993-05-05 1994-04-22 Electrical tool Expired - Lifetime EP0623422B1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
DE4314799 1993-05-05
DE19934314799 DE4314799C2 (en) 1993-05-05 1993-05-05 Power tool

Publications (2)

Publication Number Publication Date
EP0623422A1 EP0623422A1 (en) 1994-11-09
EP0623422B1 true EP0623422B1 (en) 1996-07-10

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EP94106314A Expired - Lifetime EP0623422B1 (en) 1993-05-05 1994-04-22 Electrical tool

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US (1) US5441450A (en)
EP (1) EP0623422B1 (en)
JP (1) JPH06320409A (en)
AT (1) AT140175T (en)
DE (1) DE4314799C2 (en)

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JPH06320409A (en) 1994-11-22
US5441450A (en) 1995-08-15
AT140175T (en) 1996-07-15
DE4314799C2 (en) 1995-04-13
EP0623422A1 (en) 1994-11-09

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