EP0129865B1 - Schlagwerkzeug, insbesondere Bohrhammer - Google Patents

Schlagwerkzeug, insbesondere Bohrhammer Download PDF

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Publication number
EP0129865B1
EP0129865B1 EP84107161A EP84107161A EP0129865B1 EP 0129865 B1 EP0129865 B1 EP 0129865B1 EP 84107161 A EP84107161 A EP 84107161A EP 84107161 A EP84107161 A EP 84107161A EP 0129865 B1 EP0129865 B1 EP 0129865B1
Authority
EP
European Patent Office
Prior art keywords
drive
sleeve
cylinder sleeve
guide
guide piece
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
Application number
EP84107161A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0129865A1 (de
Inventor
Otto Bergler
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.)
Black and Decker Overseas GmbH
Original Assignee
Black and Decker Overseas 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 Black and Decker Overseas GmbH filed Critical Black and Decker Overseas GmbH
Priority to AT84107161T priority Critical patent/ATE33780T1/de
Publication of EP0129865A1 publication Critical patent/EP0129865A1/de
Application granted granted Critical
Publication of EP0129865B1 publication Critical patent/EP0129865B1/de
Expired legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D11/00—Portable percussive tools with electromotor or other motor drive
    • B25D11/06—Means for driving the impulse member
    • B25D11/062—Means for driving the impulse member comprising a wobbling mechanism, swash plate
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T74/00—Machine element or mechanism
    • Y10T74/18—Mechanical movements
    • Y10T74/18024—Rotary to reciprocating and rotary
    • Y10T74/18032—Rotary to reciprocating or rotary
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T74/00—Machine element or mechanism
    • Y10T74/18—Mechanical movements
    • Y10T74/18056—Rotary to or from reciprocating or oscillating
    • Y10T74/18296—Cam and slide
    • Y10T74/18336—Wabbler type

Definitions

  • the invention relates to an impact tool, in particular a hammer drill according to the preamble of claim 1.
  • Such an impact drilling tool is known (DE-A 27 38 057).
  • a wobble drive is provided to generate the back and forth movement of a racket.
  • the axis of the wobble drive is aligned parallel to the axis of a sleeve driven by the motor.
  • the sleeve is driven via an axis which is connected to the drive pinion of the motor in the manner of an intermediate gear axis and at the same time forms the rotary drive for a wobble arm which is guided with its free end in a piston which is concentric with the piston rotating drive sleeve is axially reciprocated.
  • the disadvantage of such a design is that because of the juxtaposition of driven shafts and parts, the space requirement is very large and, moreover, the construction effort is also relatively large.
  • a drill and percussion hammer (DE-A-31 06 487) is also known, in which the reciprocating sleeve for generating the percussion movement is arranged axially with a rotating sleeve driven by the motor, which is intended to transmit the rotary movement to the tool.
  • the back and forth movement of the sleeve in the rotary drive sleeve is achieved in that the sleeve or the like with the help of guide rollers. is guided in axial slots of a guide arranged fixed to the housing and is guided with balls or rollers in a groove running spirally in the interior of the rotating sleeve.
  • the invention has for its object to design a striking tool, in particular a rotary hammer of the type mentioned, that a space-saving arrangement is possible using a wobble drive.
  • the characterizing features of claim 1 are provided according to the invention.
  • This configuration makes it possible to dispense with an additional drive mechanism for the Q wobble drive provided outside the axis of the drive spindle. The result is an arrangement aligned on only one axis, which is very space-saving. It is also advantageous in such an embodiment that it can be used advantageously not only for rotary hammers of the known type, but that the sleeve can also be designed as a drive bell mounted in the housing, which is driven via a flexible shaft fastened in it with the same axis.
  • This configuration leads to a caulking tool which can be used exclusively for striking purposes and which can have a cylindrical shape with a relatively small diameter and is therefore particularly easy to handle.
  • Advantageous features of such an embodiment are contained in subclaims 2 to 4.
  • the invention can also achieve significant space and design savings in rotary hammers.
  • Corresponding features are contained in subclaims 5 to 8.
  • This has the advantage that the guide piece for the wobble drive can be mounted on a guide pin.
  • This configuration makes it possible to switch the hammer drill to percussion drilling or only to drilling by either the guide bolt itself being firmly seated in the housing and the guide piece being guided on this guide bolt in a rotationally fixed or rotatable manner, depending on the setting of a switching arrangement.
  • an expandable arrangement which can be actuated by an axially movable shift rod and which leads to a fixed or a loose connection between the guide piece and the guide pin.
  • a hammer drill is shown schematically, which is provided in a known manner with a handle 1 and has an electromotive drive 2 inside a housing, from which a drive shaft 3 leads to the parts to be driven and designed according to the invention.
  • the drive spindle 7 is therefore set in rotation via the drive shaft 3 and the gear 6 and transmits this rotation for driving a drilling tool, not shown, above the drilling head 8.
  • a firing pin 10 is guided in the drive spindle 7, the left piston-like end of which rests against the end of an inserted tool.
  • a firing pin 11 On the right end of the firing pin 10 acts a firing pin 11 which is fixedly connected to a piston 12 which in turn is axially displaceably guided in a cylinder sleeve 13 which in turn is guided in a cylindrical guide within the drive spindle 7.
  • the cylinder sleeve 13 has a flange-like base with a type of hub 13a, into which an extension 14a of a guide piece 14 is firmly inserted.
  • the guide piece 14 itself then has a spherical part on the cylindrical part 14a, on which a circumferential guideway 14b with a hemispherical cross section is arranged, in which the bearing balls 15 for a ring 16 run with an upwardly projecting wobble arm 16a.
  • the guide track 14b is provided obliquely to a plane arranged perpendicular to the axis 17, the axis 17 being the axis of rotation of the drive spindle 7, which in the exemplary embodiment coincides with the axis of the piston 12, the cylinder sleeve 13 and the guide piece 14.
  • the guide piece 14 is the guide piece 14 axially displaceable on a guide pin 18 which is also aligned coaxially to the axis 17.
  • the guide piece 14 is secured against rotation relative to the guide pin 18 in that the guide pin 18 is guided with a longitudinal groove 18a and the guide piece 14 is guided with a ball 19 running largely without play therein.
  • the guide pin 18 itself is held aligned in a clamping device 20 with respect to the axis 17, which axially secures the guide pin and the guide piece 14 in the housing and, depending on a switching device, not shown, secures the guide pin 18 against rotation or releases it for rotation. The importance of this configuration is still discussed.
  • the wobble arm 16a of the ring 16 is articulated in a recess 7a of the drive spindle 7, which thus represents a drive sleeve for this wobble arm 16a.
  • the drive spindle 7 or the like in the usual way via ball bearings 21. is held in the housing 4, which in turn takes over the leadership of the other parts displaceable in it by appropriate fits.
  • the drive shaft 3 is also mounted in the housing 4 via ball bearings 22 or via a slide bearing 23.
  • the new hammer drill works as follows:
  • the clamping device 20 secures the guide pin 18 against rotation and that the drive motor 2 causes the drive spindle 7 to rotate via the shaft 3.
  • This rotary movement can now be used to transmit a rotary movement to the tool (not shown).
  • the rotary movement of the drive spindle 7 also causes the wobble arm 16a to make a rotary movement which, owing to the inclined guideway 14b, leads to an axial stroke movement around the stroke h of the guide piece 14 on the guide pin 18, which is caused by the balls 15 axial forces exerted on the guideway 14b.
  • the cylindrical sleeve 13 is thus stimulated to reciprocate by the stroke h.
  • the firing pin 10 in turn then exerts the desired impact effect on the end of the impact drilling tool, not shown.
  • the clamping device 20 releases the guide pin 18 for rotation.
  • the rotating drive spindle 7 takes both the guide piece 14 and the pin 18 to a rotation via the wobble arm 16. An axial displacement of the guide piece 14 and so that the cylinder sleeve 13 does not occur.
  • FIG. 1 In addition to the possible application of the invention shown in FIG. 1 for a rotary hammer, there is also the possibility of providing the mechanism suitable for the production of a reciprocating drive for a so-called stemmer, as shown in FIGS. 2a and 2b .
  • a guide sleeve 26 is inserted in an approximately cylindrical housing 25 in a rotationally fixed manner, in which a non-rotatable but axially displaceable cylinder sleeve 27 is guided in the manner explained in FIGS. 3 and 4, which in turn serves to guide the piston 12, which is the piston corresponds to the embodiment of FIG. 1.
  • a guide head 28 is connected to the housing 25, in which a chisel 21 is held axially displaceably.
  • the guide head 28 is equipped with a ball 31 which is radially adjustable in a guide 30 and which engages in an axially extending groove 32 of the chisel. If the chisel is to be removed, the sleeve 33 is displaced to the right against the action of a spring 34 until an annular groove 35 reaches the region of the ball 31, which can then be pressed radially outwards when the chisel 29 is removed.
  • the reciprocating movement of the piston 12 is achieved in the stemmer of FIGS. 2a and 2b in that a cup-shaped sleeve 36 is connected in a rotationally fixed manner to the end of a flexible shaft 37 and in that this cup-shaped sleeve 36 has the same function as the drive spindle 7 of the embodiment of FIG. 1 takes over.
  • the guide piece 37 which essentially corresponds to the guide piece 14 of FIG. 1, is here also provided with the balls 15 rotating in a guide track, which guide the ring 16 with the wobble arm 16a.
  • the wobble arm 16a is articulated in a recess 38 in the sleeve 36.
  • the guide piece 37 is, as in the embodiment of FIG.
  • the guide piece 37 is rotatably seated with a pin 37a in the sleeve 36, in the region of the part 36a in which the end of the flexible shaft 39 is also held.
  • the end 39a of the flexible shaft 39 can be a square, which is inserted into a corresponding recess in the part 36a of the sleeve 36.
  • FIGS. 3 and 4 there are various possibilities for guiding the cylinder sleeve 37 in a rotationally fixed manner in the sleeve 26 and in the housing 25.
  • Fig. 2a and Fig. 3 show the possibility that the cylinder sleeve is provided with axially extending grooves 40, in which balls 41 run, which in turn engage in axially extending slots 43 equipped with the length of the stroke of the cylinder sleeve 27.
  • FIG. 2b show the possibility of providing the cylinder sleeve 27 with diametrically opposite ribs 44 which engage in axially extending grooves 45 of the guide sleeve 26.
  • the guide sleeve 26 is pressed in the housing 25. It can also be secured by locking pins 46.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Percussive Tools And Related Accessories (AREA)
  • Drilling Tools (AREA)
  • Drilling And Boring (AREA)
EP84107161A 1983-06-25 1984-06-22 Schlagwerkzeug, insbesondere Bohrhammer Expired EP0129865B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT84107161T ATE33780T1 (de) 1983-06-25 1984-06-22 Schlagwerkzeug, insbesondere bohrhammer.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3322964A DE3322964A1 (de) 1983-06-25 1983-06-25 Schlagwerkzeug, insbesondere bohrhammer
DE3322964 1983-06-25

Publications (2)

Publication Number Publication Date
EP0129865A1 EP0129865A1 (de) 1985-01-02
EP0129865B1 true EP0129865B1 (de) 1988-04-27

Family

ID=6202414

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84107161A Expired EP0129865B1 (de) 1983-06-25 1984-06-22 Schlagwerkzeug, insbesondere Bohrhammer

Country Status (4)

Country Link
US (1) US4612999A (enrdf_load_stackoverflow)
EP (1) EP0129865B1 (enrdf_load_stackoverflow)
AT (1) ATE33780T1 (enrdf_load_stackoverflow)
DE (2) DE3322964A1 (enrdf_load_stackoverflow)

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3504650C2 (de) * 1985-02-12 1994-01-20 Bosch Gmbh Robert Bohrhammer mit Verstärkung der Betätigungskraft für die Kupplung des Schlagantriebes
US4994004A (en) * 1988-11-30 1991-02-19 Stirling Thermal Motors, Inc. Electric actuator for swashplate
DE4207295A1 (de) * 1992-03-07 1993-09-09 Black & Decker Inc Bohrhammer
US5664634A (en) * 1995-10-23 1997-09-09 Waxing Corporation Of America, Inc. Power tool
US5823906A (en) * 1997-01-02 1998-10-20 Vanderbilt University Nutation motion generator
DE102009027444A1 (de) 2009-07-03 2011-01-05 Robert Bosch Gmbh Handwerkzeugmaschine
US8636081B2 (en) 2011-12-15 2014-01-28 Milwaukee Electric Tool Corporation Rotary hammer
EP2409667B1 (en) * 2010-07-22 2015-06-17 Braun GmbH Electric appliance for personal use
DE102012221748A1 (de) * 2012-11-28 2014-05-28 Robert Bosch Gmbh Handwerkzeugmaschine
CN212706597U (zh) * 2018-02-14 2021-03-16 苏州宝时得电动工具有限公司 手持工具
US11826891B2 (en) * 2019-10-21 2023-11-28 Makita Corporation Power tool having hammer mechanism

Family Cites Families (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1901981A (en) * 1931-01-12 1933-03-21 Ragnar Erfass Motor-driven mechanical hammer
US2024684A (en) * 1934-07-23 1935-12-17 Erfass Karl Axel Ragnar Motor-driven hammer
US2491624A (en) * 1945-03-29 1949-12-20 Keller Tool Co Tool operating mechanism
US2601788A (en) * 1950-02-01 1952-07-01 P & L Products Inc Hand tool drive
DE848589C (de) * 1950-10-19 1952-09-04 Licentia Gmbh Vorsatzgetriebe
CH563845A5 (en) * 1974-01-23 1975-07-15 Marto Ag Rotary impact boring machine - has free piston reciprocating in cylinder and rotating drive shaft with electric motor power
DE2449191C2 (de) * 1974-10-16 1988-03-24 Robert Bosch Gmbh, 7000 Stuttgart Hammer
CH588632A5 (en) * 1975-03-04 1977-06-15 Bosch Gmbh Robert Impact drill with swashplate - has spring loaded pneumatic impact piston reciprocating inside tool drive sleeve
DE2738057A1 (de) * 1977-06-29 1979-02-15 Bosch Gmbh Robert Handwerkzeugmaschine
DE2820128A1 (de) * 1978-05-09 1979-11-22 Bosch Gmbh Robert Handwerkzeugmaschine
DE3039669A1 (de) * 1980-10-21 1982-05-27 Robert Bosch Gmbh, 7000 Stuttgart Bohrhammer
DE3106487A1 (de) * 1981-02-21 1982-09-09 Robert Bosch Gmbh, 7000 Stuttgart Bohr- und schlaghammer
DE3241528C2 (de) * 1982-11-10 1986-04-10 Eugen Lutz GmbH u. Co Maschinenfabrik, 7130 Mühlacker Werkzeugspannfutter für einen Bohrhammer

Also Published As

Publication number Publication date
DE3470679D1 (en) 1988-06-01
US4612999A (en) 1986-09-23
EP0129865A1 (de) 1985-01-02
ATE33780T1 (de) 1988-05-15
DE3322964C2 (enrdf_load_stackoverflow) 1987-07-09
DE3322964A1 (de) 1985-01-24

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