EP0048482A1 - Drehschlag-Bohrwerkzeug - Google Patents

Drehschlag-Bohrwerkzeug Download PDF

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Publication number
EP0048482A1
EP0048482A1 EP81107493A EP81107493A EP0048482A1 EP 0048482 A1 EP0048482 A1 EP 0048482A1 EP 81107493 A EP81107493 A EP 81107493A EP 81107493 A EP81107493 A EP 81107493A EP 0048482 A1 EP0048482 A1 EP 0048482A1
Authority
EP
European Patent Office
Prior art keywords
beat piece
percussive
bit
rotary
percussive drill
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.)
Granted
Application number
EP81107493A
Other languages
English (en)
French (fr)
Other versions
EP0048482B1 (de
Inventor
Frank Flintoft Simpson
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 Inc
Original Assignee
Black and Decker Inc
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 Inc filed Critical Black and Decker Inc
Priority to AT81107493T priority Critical patent/ATE9881T1/de
Publication of EP0048482A1 publication Critical patent/EP0048482A1/de
Application granted granted Critical
Publication of EP0048482B1 publication Critical patent/EP0048482B1/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
    • B25D16/00—Portable percussive machines with superimposed rotation, the rotational movement of the output shaft of a motor being modified to generate axial impacts on the tool bit
    • B25D16/006—Mode changers; Mechanisms connected thereto

Definitions

  • This invention relates to rotary percussive drills and has particular reference to hand-held rotary percussive drills fitted with a control enabling the user to decouple the percussive drive when required to enable the drill to be used in a rotary mode.
  • hammer blows are imparted to a drill bit or other tool via a beat piece and it has been proposed to provide a user- operated control which acts to hold the beat piece clear of the percussive drive when it is desired to use the percussive drill in the rotary mode.
  • the control when actuated by the user urges locking elements into an annular groove in the beat piece so holding the latter in a position in which it is clear of the percussive drill.
  • a rotary percussive drill comprises a bit holder, driving means for imparting rotation to the bit holder, a percussive drive, a beat piece for transmitting percussion from the percussive drive to a bit when positioned in the holder characterised in that the beat piece has at least one elongate axial recess on its outer surface, the recess being engaged with locking elements, and an arrangement for moving the locking elements between a first position in which the beat piece is in operative engagement with the percussive drive and transmits percussion from the percussive drive to the bit, and a second position in which the beat piece is operatively disengaged from the percussive drive and cannot transmit percussion from the percussive drive to the bit.
  • the locking elements comprise balls located in the recess and in engagement with a member movement of which effects operative engagement and disengagement of the beat piece and the percussive drive.
  • the movable member may be of generally tubular form and mounted for rotation about the axis of the beat piece.
  • the bore of the tube being formed with acam surface so contoured that on rotation of the movable member the locking elements are moved axially to effect operative engagement or disengagement of the beat piece and the percussive drive.
  • the rotary percussive drill has a bit holder in the form of a tubular sleeve 1 one end of which has teeth 2 which engage a bevel gear 3 through which rotation about its longitudinal axis is imparted to the sleeve 1.
  • the bevel gear is driven by an electric motor 4 which also provides a percussive drive through the medium of a pneumatically-actuated ram 5 reciprocable in a hollow piston 6.
  • pneumatically-actuated rams to provide percussive action is well known and will not be described further.
  • the beat piece Movable along the bore of the sleeve 1 is a beat piece 7.
  • the beat piece is located between the ram 5 and a bit (not shown) but which is held in the sleeve 1 by releasable locking balls 8 and rotatable by the sleeve 1 via driving elements one of which is indicated at 9.
  • the beat piece 7 has two diametrically opposed axial recesses 10 located between the nose 11 of the beat piece and an end portion lla of reduced diameter as compared with the remainder of the beat piece and is located in a smaller diameter bore 12 of the beat piece.
  • the recesses 10 accommodate locking elements in the form of balls 13 that locate permanently in the recesses 10 and engage the surface of an annular holder 14 through axial slots 19 in the bit holder sleeve 1, the holder 14 maintained in contact with the cam face 15 of a mode change control member 16 of generally tubular form by a helical spring 17.
  • the beat piece 7 is, in use, cyclically impacted by the nose 18 of the ram 5 as the latter is reciprocated in the hollow piston 6 and those impacts are transferred by the beat piece 7 to the bit.
  • the sleeve is rotated about its.
  • the axial length of the recess 10 is sufficient to permit the required reciprocatory movement of the beat piece.
  • the mode change control member 16 is rotated so moving the balls 13 to the left as seen in the drawing and along the slots 19 and the recess 10.
  • the balls 13 contact the left-hand (as seen in the drawing) end of the recess 10 and continued rotation of the member 16 moves the beat piece 7 to the left (as seen in the drawing) by an amount sufficient to provide clearance between the end lla and the nose 18 of the ram 5 when the latter is at the end of its impacting stroke.
  • the beat piece 7 is not impacted by the nose of the piston and the bit is subject only to rotary movement.
  • the member 16 is rotated in the reverse direction so allowing the balls 13 to return, under the action of spring 17, to the position shown in the drawing and, when the user presses the bit against a workpiece, allowing the beat piece 7, to resume its active position in which it is impacted cyclically by the nose 18 of the piston 5.
  • the cam face 15 of the control member 16 may be so contoured that a 90° or 180° rotation of the member 16 is needed to complete the required axial movement of the balls 13 along the slots 19.
  • the contour of the cam face 15 may, alternatively, be such that further rotation of the member 16 in the same direction allows the balls 13 to be returned to their original positions.
  • control member 16 may be adapted to be moved axially and not rotated to effect the change between the hammer and non-hammer modes.
  • the bit is subjected to percussive action of the beat piece only when the bit is pressed by the user into contact with a workpiece. Such pressure resulting in a small inward movement of the bit into the sleeve and of the beat piece towards the ram.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Percussive Tools And Related Accessories (AREA)
  • Drilling And Boring (AREA)
  • Drilling Tools (AREA)
EP81107493A 1980-09-22 1981-09-21 Drehschlag-Bohrwerkzeug Expired EP0048482B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT81107493T ATE9881T1 (de) 1980-09-22 1981-09-21 Drehschlag-bohrwerkzeug.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB8030556 1980-09-22
GB8030556 1980-09-22

Publications (2)

Publication Number Publication Date
EP0048482A1 true EP0048482A1 (de) 1982-03-31
EP0048482B1 EP0048482B1 (de) 1984-10-17

Family

ID=10516212

Family Applications (1)

Application Number Title Priority Date Filing Date
EP81107493A Expired EP0048482B1 (de) 1980-09-22 1981-09-21 Drehschlag-Bohrwerkzeug

Country Status (3)

Country Link
EP (1) EP0048482B1 (de)
AT (1) ATE9881T1 (de)
DE (1) DE3166719D1 (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0108411A1 (de) * 1982-11-10 1984-05-16 Eugen Lutz GmbH & Co. Maschinenfabrik Bohrmaschine, insbesondere Handbohrmaschine
EP0052507B1 (de) * 1980-11-18 1985-02-13 Black & Decker Inc. Schlagbohrgerät
DE102004047606A1 (de) * 2004-09-30 2006-04-06 Hilti Ag Bohr- und/oder Meisselhammer

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE6906110U (de) * 1969-02-15 1969-06-12 Metabowerke Kg Bohrmaschine mit einem schlagbohrmechanismus
US3998278A (en) * 1974-05-14 1976-12-21 Licentia Patent-Verwaltungs-G.M.B.H. Hammer drill
DE2806611A1 (de) * 1978-02-16 1979-08-23 Licentia Gmbh Vorrichtung zum umschalten eines elektropneumatischen bohrhammers von drehbohren auf schlagbohren
DE2605998B2 (de) * 1976-02-14 1979-10-25 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt Bohrhammer mit in einem Zylinder untergebrachten Antriebs- und Schlagelementen
EP0029968A2 (de) * 1979-11-30 1981-06-10 Black & Decker Inc. Werkzeughalter

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE6906110U (de) * 1969-02-15 1969-06-12 Metabowerke Kg Bohrmaschine mit einem schlagbohrmechanismus
US3998278A (en) * 1974-05-14 1976-12-21 Licentia Patent-Verwaltungs-G.M.B.H. Hammer drill
DE2605998B2 (de) * 1976-02-14 1979-10-25 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt Bohrhammer mit in einem Zylinder untergebrachten Antriebs- und Schlagelementen
DE2806611A1 (de) * 1978-02-16 1979-08-23 Licentia Gmbh Vorrichtung zum umschalten eines elektropneumatischen bohrhammers von drehbohren auf schlagbohren
EP0029968A2 (de) * 1979-11-30 1981-06-10 Black & Decker Inc. Werkzeughalter

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0052507B1 (de) * 1980-11-18 1985-02-13 Black & Decker Inc. Schlagbohrgerät
EP0108411A1 (de) * 1982-11-10 1984-05-16 Eugen Lutz GmbH & Co. Maschinenfabrik Bohrmaschine, insbesondere Handbohrmaschine
US4585077A (en) * 1982-11-10 1986-04-29 Black & Decker Overseas Ag Drilling mechanism optionally usable as a rotary drill or a hammer drill
DE102004047606A1 (de) * 2004-09-30 2006-04-06 Hilti Ag Bohr- und/oder Meisselhammer

Also Published As

Publication number Publication date
EP0048482B1 (de) 1984-10-17
ATE9881T1 (de) 1984-11-15
DE3166719D1 (en) 1984-11-22

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