EP0928668A2 - Accouplement pour une machine à percer par percussion - Google Patents

Accouplement pour une machine à percer par percussion Download PDF

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Publication number
EP0928668A2
EP0928668A2 EP99100510A EP99100510A EP0928668A2 EP 0928668 A2 EP0928668 A2 EP 0928668A2 EP 99100510 A EP99100510 A EP 99100510A EP 99100510 A EP99100510 A EP 99100510A EP 0928668 A2 EP0928668 A2 EP 0928668A2
Authority
EP
European Patent Office
Prior art keywords
receptacle
coupling according
output
locking sleeve
shaft
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.)
Withdrawn
Application number
EP99100510A
Other languages
German (de)
English (en)
Other versions
EP0928668A3 (fr
Inventor
Fritz Kohler
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.)
Kohler Maschinenbau GmbH
Original Assignee
Kohler Maschinenbau GmbH
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
Application filed by Kohler Maschinenbau GmbH filed Critical Kohler Maschinenbau GmbH
Publication of EP0928668A2 publication Critical patent/EP0928668A2/fr
Publication of EP0928668A3 publication Critical patent/EP0928668A3/fr
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D17/00—Details of, or accessories for, portable power-driven percussive tools
    • B25D17/08—Means for retaining and guiding the tool bit, e.g. chucks allowing axial oscillation of the tool bit
    • B25D17/084—Rotating chucks or sockets
    • B25D17/088—Rotating chucks or sockets with radial movable locking elements co-operating with bit shafts specially adapted therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D2217/00—Details of, or accessories for, portable power-driven percussive tools
    • B25D2217/003—Details relating to chucks with radially movable locking elements
    • B25D2217/0038—Locking members of special shape
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D2250/00—General details of portable percussive tools; Components used in portable percussive tools
    • B25D2250/231—Sleeve details
    • B25D2250/235—Sleeve couplings

Definitions

  • the invention relates to a coupling for releasably connecting a Drive with an output shaft for a hammer drilling tool.
  • a such a coupling is always used in hammer drilling tools if the drilling depth to be achieved is greater than the length of the Available hammer drilling tools.
  • a large number of requirements are placed on such a coupling.
  • a transfer of the provided is particularly important Drive energy with the lowest possible losses. This is particularly so important because when drilling particularly deep holes, for example of blast holes in rock, several extension pieces can be plugged together by means of such couplings. Good efficiency the coupling is essential here, otherwise the Energy losses from the drive machine to the hammer drilling tool become prohibitively large.
  • Another requirement imposed on such Coupling is in their ease of use, and both when assembling and disassembling.
  • a well-known clutch is the company's "RATIO" clutch Brighter.
  • This coupling is based on a threaded bolt with a round thread, which is screwed into an associated receptacle. Under Load, the threaded bolt screws into the mount so far that the occurring drive torque can be transmitted. Disadvantageous this coupling is the one that occurs when hammer drilling Energy losses.
  • the drive energy during hammer drilling sets together from the energy required to turn the tool and the energy of the stroke movement, the proportion of the stroke movement being of the total drive energy is significantly higher than the share of Energy to turn the tool. It comes with the RATIO coupling the transmission of impact energy to significant energy losses at higher loads, the coupling heats up considerably to lead.
  • the object of the invention is to provide a clutch with which the drive energy provided for hammer drilling extremely low losses from an input shaft to an output shaft can be transferred.
  • a clutch for the detachable connection of an input shaft with an output shaft for a hammer drilling tool, with a tubular holder into which one end of each shaft can be inserted and that in their Wall with at least one opening assigned to the drive shaft, in which a drive key is arranged, and with at least one the output shaft associated opening is provided in the Output key is arranged, and with a locking mechanism, the manually between a locking position in which the Output key in a protruding into the interior of the receptacle Position is locked, and a release position is adjustable in which the output key is movable in the radial direction to the outside.
  • Such a coupling is based on the following finding: minimization the losses in the transmission of the drive energy can in particular be achieved when the losses in the transfer of the Impact energy can be reduced since the impact energy does most of the made available drive energy. Minimizing losses in the transmission of the impact energy results when at the Energy transmission no other elements are involved, the impact energy So directly without the interposition of the clutch from the Drive is transmitted to the output shaft.
  • the clutch itself is only used to transmit the energy to turn the output shaft as well as for guiding the output shaft. This realization is made by the clutch implemented in a technically simple manner.
  • the tubular Holder into which the input shaft and the output shaft are inserted can be used to guide the output shaft.
  • the drive key and the output key are used to transfer the energy to Turn the output shaft.
  • the feather keys are not involved in the input shaft to the output shaft; the energy transfer takes place directly through the installation of the two waves to each other.
  • the locking mechanism enables the output key from a position protruding into the interior of the receptacle, in which the output shaft is held in the clutch, in to move a position in which the output shaft from the clutch can be pulled out.
  • the one in the transmission of drive energy Power losses that occur are so small that it becomes negligible
  • the clutch heats up during operation. Therefore, the clutch can be used immediately after completion of a drilling operation be operated. Also blocking the output shaft in the clutch can not. Because there is very little loss in energy transmission occur, the coupling can be dimensioned very easily be, so that even with a small space very high energies can be transferred.
  • the drive and the output key one from the interior have the outside facing away from the receptacle, which is curved, where the radius of curvature is the same as the radius of curvature of Outer surface of the receptacle and the center of curvature in the interior of the Recording lies.
  • the feather keys close flush with the outer surface of the receptacle, so that a uniform power transmission possible from the parallel keys to the locking mechanism is.
  • the drive and the output key one the interior of the Receiving side facing inside, viewed in one plane perpendicular to the longitudinal axis of the image, as a circular arc over an angular range runs from about 180 ° to which the curved outside connects, with the center of curvature of the inside on the side of the inside facing away from the longitudinal axis of the receptacle lies.
  • This design enables an even load on the Feather keys, so that particularly high peripheral forces between the receptacle and the drive or the output shaft can be transmitted.
  • the locking mechanism is a locking sleeve contains that on the outer surface of the recording in the axial direction is displaceable and rotatable in the circumferential direction and a Control curve, in which a control extension of the output key intervenes.
  • the locking sleeve is easier with this design and reliably performed on the outer surface of the recording and is easy for an operator to operate.
  • the receptacle at one axial end with a collar is provided, with the paragraph between the collar and the outer surface the recording formed as a control surface aligned in the axial direction is with the axial end of the locking sleeve facing the collar cooperates, which is designed as a contact surface.
  • the Control surface thus sets a rotational movement of the locking sleeve relative to the inclusion in a movement in the axial direction by means of in a suitable manner on the control extension of the output key can be influenced.
  • the side walls of the openings in the receptacle are considered in a cross section perpendicular to the longitudinal axis of the receptacle, along a section facing the inside of the receptacle as Arcs run.
  • the side walls of the openings are therefore on the
  • the outer contour of the parallel keys is optimally adjusted so that it is even Transfer of the tangential forces from the drive shaft into the holder or the inclusion in the output shaft is guaranteed.
  • two input and output keys each are provided, which are diametrically opposed to each other.
  • the use of two parallel keys on the drive side and the driven side has proven to be a good compromise between manufacturing costs on the one hand and the maximum transferable drive energy on the other hand.
  • Fig. 1 is the coupling for releasably connecting a drive shaft shown with an output shaft for hammer drilling tools.
  • the Coupling contains a tubular receptacle 10 (see also the figures 5 to 9).
  • the receptacle 10 has a cylindrical inner surface 12, which defines the interior of the recording, one end each an input shaft 14 and an output shaft 16 are inserted can.
  • the outer diameter of the receptacle 10 is the same 28 mm.
  • the length of the receptacle 10 is such that a sufficient Guide the ends of the drive shaft inserted into the receptacle 10 or the output shaft is guaranteed.
  • the recording 10 is with two openings 18 assigned to the drive shaft 14 which each have the contour of an elongated hole.
  • the each other in the circumferential direction the receptacle 10 opposite side walls of each opening 18 consist of a section facing the interior of the receptacle 20, which is in the form of a circular arc, and in each case one outlet section 22, which runs approximately parallel to the opposite outlet section.
  • the arcuate sections 20 of each opening 18 have one common center of curvature.
  • the receptacle 10 is also diametrically opposed to two Provide openings 24 associated with the output shaft 16 are.
  • the side walls of the openings 24 are designed in the same way like the side walls of the openings 18.
  • the receptacle 10 is on its axial left with respect to the figures End axially with one over the remaining outer surface of the receptacle 10 protruding collar 26 provided in one piece with the material of the Recording 10 is formed.
  • the paragraph between the federal government 26 and the The outer surface of the receptacle 10 is effective in the axial direction Control surface 28 formed (see also Fig. 7; drawn there developed).
  • the control surface consists of a total of six different ones Sections measured in the circumferential direction each have the same length to have. When viewed in the circumferential direction U, the control surface exists 28 from two first sections 30, viewed in the axial direction furthest from the openings 24.
  • Section 32 On every section 30 a section 32 and a section 34 follow in the manner of a staircase, that viewed in the axial direction in each case closer to the openings 24 lie.
  • Section 34 When viewed in the circumferential direction U, everyone follows Section 34 again the farthest from the openings 24 lying section 30.
  • Section 32 is on its section 30 facing end provided with a projection 33, the Axis apex viewed closer to openings 24 lies as section 32.
  • the transitions between sections 30, 32 and 34 are each rounded off (see in particular Fig. 8).
  • the receptacle 10 is also on its inside on each axial End provided with a groove 36 in which a sealing ring 38 is arranged is.
  • the locking sleeve is at its left axial end with respect to the figures with a Provided contact surface 42, which is provided on the control surface 28 of the recording 10 to get into the system.
  • the contact surface 42 has two spaced apart elevations 44, the in Length measured in the circumferential direction of the length of the sections 30, 32 and 34 corresponds.
  • the distance between the two elevations 44 corresponds the length of two sections of the control surface 28.
  • the elevations 44 are each sections of the control surface 28 opposite, viewed in the axial direction the same distance from have the openings 24.
  • the transitions are rounded between the contact surface 42 and the elevations 44 educated.
  • the locking sleeve 40 is also diametrically opposed to each other opposite control curves 46 provided.
  • Each cam 46 consists of a in the longitudinal direction of the locking sleeve 40th extending outlet section 48, a connecting section 50, which extends in the circumferential direction and centrally in the outlet section 48 opens, and a holding section, which corresponds to that of Exit section 48 facing away from the end of the connecting section 50 connects.
  • the holding section 52 has an approximately rectangular circumferential contour with rounded corners (see Fig. 12; the peripheral contour of the Holding section 52 is completed with dashed lines).
  • the locking sleeve 40 is included formed a flat circumferential groove 54 which is wider than the outlet portion 48 is so that the entire control curve 46 on Groove base is located.
  • An annular spring 56 can be inserted into the groove 54 (see figures 18 and 19) are used, which are then flush with the outer surface the locking sleeve 40 closes.
  • the ring spring 56 is slotted Spring steel sleeve formed and with two notches 58 into the complementary lugs 60 of the side walls of the groove 54 engage so that the ring spring 56 against rotation on the locking sleeve 40 is attached.
  • a compression spring 62 With its right axial end abuts a stop ring 64 (see Fig. 20).
  • a stop ring 64 is pushed onto the outer surface of the receptacle 10 and is held there by a locking ring 66, which in a Circumferential groove 68 is arranged at the right axial end of the receptacle 10.
  • the right axial end of the locking sleeve 40 and the left axial End of the stop ring 64 are provided with a shoulder 70 or 72, on which a protective sleeve 74 is axially displaceable. This Protective sleeve closes flush with the outer surface of the locking sleeve 40 and the stop ring 64.
  • An output key 76 is located in each opening 24 of the receptacle 10 arranged (see also Figures 13 to 15).
  • the output springs are rounded and have one of the exterior of the recording facing, curved outside 78, the radius of curvature is the same as the radius of curvature of the outer surface of the receptacle 10 and their center of curvature when mounted in the openings 24 Output springs in the interior of the receptacle 10.
  • Even the inside 80 of each key 76 is curved, the contour the inside 80, viewed in one to the longitudinal axis of the receptacle 10 vertical plane, as a circular arc over an angle of approximately 180 ° runs.
  • the center of curvature of the inside 80 lies on it the side of the inner side 80 facing away from the interior of the receptacle 10.
  • the inside 80 connects to the via rounded transitions 82 Outside 78 on.
  • the drive keys 84 shown in FIGS. 16 to 17 are in the same way as the output keys 76 described so far educated.
  • the differ from the drive keys 84 Output springs 76 only by a control extension 86, which in The plan view of FIG. 15 seen with a rectangular cross section has rounded corners.
  • the height of the control extension 86 corresponds the wall thickness of the locking sleeve 40 in the area of the control curve 46. Seen in the front view of FIG. 14, the Control extension 86 starting from the transition into the outside 78 dovetail-shaped.
  • the clutch is on the drive shaft 14 in the following manner assembled: First, the drive shaft 14 is inserted into the receptacle 10. Then the drive shaft 14 is positioned in the circumferential direction so that two running on its outer circumference in the longitudinal direction, grooves 88 diametrically opposite one another with the openings 18 are aligned. Then a drive key is in each opening 18 84 used, the inside of which engages in the groove 88. Further an output key 76 is inserted into each opening 24. Because of the design of the openings 18 and 24, the feather keys only so far into the openings that their outside is flush with the outside of the receptacle 10.
  • the locking sleeve of the right with respect to the figures axial end pushed onto the receptacle 10 until it with her Contact surface 42 on the control surface 28 of the federal government 26 of the receptacle 10 is present.
  • the locking sleeve 40 is slotted, so that it can be expanded slightly so that it can be used over the Outside surface of the receptacle 10 protruding control extensions 86 of the Output springs 76 can be pushed.
  • the locking sleeve 40 is then aligned in the circumferential direction so that the control extensions 86 come to rest in the holding sections 52 of the control cams 46.
  • the locking sleeve 40 In the elevations 44 of the locking sleeve lie in this circumferential position 40 on the sections 30 of the control surface 28; in other words expressed, the locking sleeve 40 is in relation to it the figures shifted to the left as far as possible. This Position is called the locking position. Then be on the receptacle 10, the compression spring 62 and the stop ring 64 postponed, which is fixed with the locking ring 66. To this Way, the locking sleeve 40 is permanently against the control surface 28 acted upon the receptacle 10. Finally, on the locking sleeve 40 the ring spring 56 inserted into the groove 54, and the Protective sleeve 74 will cover the compression spring 62 between the locking sleeve 40 and the stop ring 64 attached.
  • the clutch is now attached to the drive shaft 14 ready for operation. Since the grooves 88 of the drive shaft 14 in front of the front of the end of the drive shaft 14 inserted into the receptacle 10, the clutch cannot be removed from the drive shaft 14. There however, the axial length of the drive keys is less than that axial length of the grooves 88, the coupling can be in the axial direction the drive shaft 14 can be adjusted.
  • the output shaft 16 is inserted into the coupling in FIG as follows: First, the locking sleeve is relative to the receptacle 10 rotated in the circumferential direction, so that the elevations 44 of the Contact surface 42 of the sections 30 overcoming the Projections 33 reach the sections 32 of the control surface 28.
  • the Locking sleeve is so to the right in the axial direction adjusted until it reaches a release position. Sections 34 serve as a stop in this position, and the projections 33 prevent unintentional resetting of the locking sleeve in the locking position.
  • This adjustment movement towards The release position reaches the one engaging in the control cam 46 Control extension 86 of the output keys 76 from the holding section 52 via the connecting section 50 into the outlet section 48.
  • the output key 76 occurs the action of the ring spring 56 in a on the outer circumference of the output shaft trained, extending in the longitudinal direction groove 90, the Length is greater than the length of the output keys and the in same as the groove 88 in front of the face of the in the recording 10 inserted end of the shaft ends.
  • the locking sleeve 40 can again turned from its release position back to the locking position in which the control extension 86 into the holding section 52 of the Control cam 46 engages. This condition is in the bottom half of Fig. 1 and shown in Fig. 3.
  • Locking sleeve is an exit of the output key 76 from the Grooves 90 of the output shaft 16 out by contacting the outside 78 the output key at the areas surrounding the holding section 52 the locking sleeve 40 prevented.
  • the output shaft can not now can be completely pulled out of the holder.
  • the coupling can have drive or output pass springs if the end faces of the two ends of the shafts inserted into the coupling to be moved back and forth in the axial direction.
  • One in axial direction transmitted from the drive shaft 14 to the output shaft 16 Load, especially a shock load, is therefore not of the coupling, but only by contacting the two end faces the waves are transmitted to each other.
  • Just a turn of the Drive shaft 14 is via the drive keys 84, the receptacle 10 and the output pass springs 76, i.e. with the clutch interposed, transmitted to the output shaft 16. This gives rise to the particular low coupling losses when hammer drilling.
  • An important aspect of the clutch according to the invention is in that only a very small amount of space is required.
  • a special one interesting application area of the coupling is the drilling of Blast holes in rock. These blast holes usually have one Diameter of 32 mm. With the required great depth of the blast holes it turned out to be useful, the actual one Train drills with a comparatively short length and by interposing extension pieces to the final one Drilling depth into the rock. It has been shown that the drive energy required to drive the drill with a clutch can be transferred, the outer diameter of only has about 28 mm. Tests carried out with such a coupling have also shown the particularly low energy losses.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Percussive Tools And Related Accessories (AREA)
  • Quick-Acting Or Multi-Walled Pipe Joints (AREA)
EP99100510A 1998-01-13 1999-01-12 Accouplement pour une machine à percer par percussion Withdrawn EP0928668A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE29800467U DE29800467U1 (de) 1998-01-13 1998-01-13 Kupplung zum lösbaren Verbinden einer Antriebs- mit einer Abtriebswelle für ein Hammerbohrwerkzeug
DE29800467U 1998-01-13

Publications (2)

Publication Number Publication Date
EP0928668A2 true EP0928668A2 (fr) 1999-07-14
EP0928668A3 EP0928668A3 (fr) 2003-05-21

Family

ID=8051199

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99100510A Withdrawn EP0928668A3 (fr) 1998-01-13 1999-01-12 Accouplement pour une machine à percer par percussion

Country Status (2)

Country Link
EP (1) EP0928668A3 (fr)
DE (1) DE29800467U1 (fr)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1245341A2 (fr) * 2001-03-29 2002-10-02 DreBo Werkzeugfabrik GmbH Accouplement
EP1400655A3 (fr) * 2002-09-23 2005-01-12 DreBo Werkzeugfabrik GmbH Mécanisme de transmission de couple
DE102011107348A1 (de) * 2011-06-29 2013-01-03 Tracto-Technik Gmbh & Co. Kg "Verbindungsvorrichtung"
CN106836847A (zh) * 2016-12-30 2017-06-13 李聪 爆破式混凝土破裂机
CN107310053A (zh) * 2016-12-30 2017-11-03 李聪 高效碎石机
USD922166S1 (en) 2018-10-09 2021-06-15 Milwaukee Electric Tool Corporation Tool bit adapter
US11780063B2 (en) 2017-10-10 2023-10-10 Milwaukee Electric Tool Corporation Power tool to tool bit extension adapter

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1505907A (en) * 1974-07-04 1978-04-05 Duss Gmbh & Co Rotary percussive hammer
US4131165A (en) * 1976-04-28 1978-12-26 Robert Bosch Gmbh Hammer drill
DE9305034U1 (de) * 1993-04-02 1994-08-04 Bosch Gmbh Robert Elektrisch betriebener Hammer

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1505907A (en) * 1974-07-04 1978-04-05 Duss Gmbh & Co Rotary percussive hammer
US4131165A (en) * 1976-04-28 1978-12-26 Robert Bosch Gmbh Hammer drill
DE9305034U1 (de) * 1993-04-02 1994-08-04 Bosch Gmbh Robert Elektrisch betriebener Hammer

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1245341A2 (fr) * 2001-03-29 2002-10-02 DreBo Werkzeugfabrik GmbH Accouplement
EP1245341A3 (fr) * 2001-03-29 2003-05-21 DreBo Werkzeugfabrik GmbH Accouplement
EP1400655A3 (fr) * 2002-09-23 2005-01-12 DreBo Werkzeugfabrik GmbH Mécanisme de transmission de couple
DE102011107348A1 (de) * 2011-06-29 2013-01-03 Tracto-Technik Gmbh & Co. Kg "Verbindungsvorrichtung"
US9080395B2 (en) 2011-06-29 2015-07-14 Tracto-Technik Gmbh & Co. Kg Connection mechanism
CN106836847A (zh) * 2016-12-30 2017-06-13 李聪 爆破式混凝土破裂机
CN107310053A (zh) * 2016-12-30 2017-11-03 李聪 高效碎石机
US11780063B2 (en) 2017-10-10 2023-10-10 Milwaukee Electric Tool Corporation Power tool to tool bit extension adapter
USD922166S1 (en) 2018-10-09 2021-06-15 Milwaukee Electric Tool Corporation Tool bit adapter
USD982409S1 (en) 2018-10-09 2023-04-04 Milwaukee Electric Tool Corporation Tool bit adapter

Also Published As

Publication number Publication date
EP0928668A3 (fr) 2003-05-21
DE29800467U1 (de) 1999-08-26

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