EP0048482B1 - Perceuse rotative à percussion - Google Patents

Perceuse rotative à percussion Download PDF

Info

Publication number
EP0048482B1
EP0048482B1 EP81107493A EP81107493A EP0048482B1 EP 0048482 B1 EP0048482 B1 EP 0048482B1 EP 81107493 A EP81107493 A EP 81107493A EP 81107493 A EP81107493 A EP 81107493A EP 0048482 B1 EP0048482 B1 EP 0048482B1
Authority
EP
European Patent Office
Prior art keywords
beat piece
mode change
bit
percussive
recess
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
EP81107493A
Other languages
German (de)
English (en)
Other versions
EP0048482A1 (fr
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/fr
Application granted granted Critical
Publication of EP0048482B1 publication Critical patent/EP0048482B1/fr
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.
  • the above mentioned DE-A 1-28 06 61 1 discloses to use as a holder for the locking elements the bit holder, and the mode change member may be rotated in order to provide a radially extending chamber in the vicinity of the opening within the drive tube, so that the locking member may be received within the chamber, thereby permitting the drill to be operated in the hammer mode.
  • the present invention is different from this prior art construction in that the holder can be moved axially. This permits the locking element held by the holding member to positively move the beat piece into a position in which the drill operates in the non-hammer mode.
  • the construction according to the present invention is very simple and allows to change the operation mode of the drill irrespective of whether the drill is operative or not
  • the above mentioned prior art construction needs a special arrangement for preventing the percussive drive from impacting on the beat piece. Therefore, the prior art construction is rather complicated.
  • a mode change into non-hammer mode with the prior art construction can only be achieved if the beat piece is in a position in which the annular groove of the beat piece is aligned with the locking element. Therefore, if the beat piece is in a position other than the above mentioned position, a mode change is not possible.
  • 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 11 a 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 longitudinal axis by the drive transmitted to gear 3 and this rotation is transferred to the bit by the driving elements 9.
  • 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 11 a 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)

Claims (9)

1. Perceuse rotative à percussion comportant un porte-foret (1) sous forme d'un tube d'entraînement, des moyens d'entraînement (3) pour entraîner en rotation le porte-foret, un entraînement à percussion (5, 6) et une pièce de battement (7) pour transmettre les percussions, à partir de l'entraînement à percussion, au foret lorsqu'il est placé dans le porte-foret, la pièce de battement (7) comportant au moins un évidement (10) sur sa surface extérieure, au moins un élément de blocage (13) engagé dans l'évidement par une ouverture du tube d'entraînement (1 ), et un agencement (14, 16) pour déplacer le ou chaque élément de blocage (13) entre une première position dans laquelle la pièce de battement (7) est opérationnellement capable d'engager l'entraînement à percussion, pour transmettre les percussions au foret, et une deuxième position dans laquelle la pièce de battement (7) est maintenue opérationnellement désengagée de l'entraînement à percussion (5, 6) et ne peut pas transmettre les percussions au foret, caractérisée en ce que le ou chaque évidement de la pièce de battement (7) est un évidement axial allongé (10), en ce que l'ouverture dans le tube d'entraînement a la forme d'une fente axiale (19), et en ce que le ou chaque élément de blocage (13) est engagé dans un support de type annulaire (14) qui est axialement déplaçable par l'organe de changement de mode (16).
2. Perceuse rotative à percussion selon la revendication 1, caractérisée en ce que la longueur axiale de chaque évidement (10) est suffisante pour permettre le mouvement de la pièce de battement (7) lorsqu'elle transmet des percussions au foret, depuis l'entraînement à percussion (5, 6).
3. Perceuse rotative à percussion selon la revendication 1 ou 2, caractérisée en ce que le support (14) est élastiquement repoussé par un ressort en engagement avec un manchon de changement de mode (16) mobile entre des première et deuxième positions, pour provoquer le déplacement des éléments de blocage (13).
4. Perceuse rotative à percussion selon la revendication 3, caractérisée en ce que le manchon de changement de mode (16) est rotatif autour de l'axe de la pièce de battement (7).
5. Perceuse rotative à percussion selon la revendication 4, caractérisée en ce que le manchon de changement de mode (16) présente une surface de came (15) en engagement avec le support (14).
6. Perceuse rotative à percussion selon la revendication 5, caractérisée en ce que la surface de came (15) est profilée de telle sorte que la rotation du manchon de changement de mode sur au moins 90° est nécessiare pour déplacer l'élément blocage (13) entre ses première et deuxième positions.
7. Perceuse rotative à percussion selon la revendication 5, caractérisée en ce que la surface de came (15) est profilée de telle sorte que la rotation du manchon de changement de mode (16) sur au moins 90° entraîne le déplacement de l'élément de blocage (13) de la première à la deuxième position, et en ce que la rotation poursuivie du manchon de changement de mode (16) dans le même sens entraîne le déplacement de l'élément de blocage (13) de la deuxième à la première position.
8. Perceuse rotative à percussion selon l'une des revendications 1 à 7, caractérisée en ce que la pièce de battement (7) comporte deux évidements axiaux diamétralement opposés (10), et en ce que sont prévus deux éléments de blocage (13) dont l'un est placé dans un évidement, et l'autre dans l'autre évidement.
9. Perceuse rotative à percussion selon l'une des revendications 1 à 8, caractérisée en ce que chaque élément de blocage (13) est une bille.
EP81107493A 1980-09-22 1981-09-21 Perceuse rotative à percussion Expired EP0048482B1 (fr)

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 EP0048482A1 (fr) 1982-03-31
EP0048482B1 true EP0048482B1 (fr) 1984-10-17

Family

ID=10516212

Family Applications (1)

Application Number Title Priority Date Filing Date
EP81107493A Expired EP0048482B1 (fr) 1980-09-22 1981-09-21 Perceuse rotative à percussion

Country Status (3)

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

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4442906A (en) * 1980-11-18 1984-04-17 Black & Decker Inc. Percussive drills
DE3241528C2 (de) * 1982-11-10 1986-04-10 Eugen Lutz GmbH u. Co Maschinenfabrik, 7130 Mühlacker Werkzeugspannfutter für einen Bohrhammer
DE102004047606A1 (de) * 2004-09-30 2006-04-06 Hilti Ag Bohr- und/oder Meisselhammer

Family Cites Families (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
CH591008A5 (fr) * 1974-05-14 1977-08-31 Licentia Gmbh
DE2605998C3 (de) * 1976-02-14 1981-12-24 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt Bohrhammer mit in einem Zylinder untergebrachten Antriebs- und Schlagelementen
DE2806611C2 (de) * 1978-02-16 1983-10-27 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt Vorrichtung zum Umschalten eines elektropneumatischen Bohrhammers von Drehbohren auf Schlagbohren
US4378053A (en) * 1979-11-30 1983-03-29 Black & Decker Inc. Tool holder

Also Published As

Publication number Publication date
DE3166719D1 (en) 1984-11-22
EP0048482A1 (fr) 1982-03-31
ATE9881T1 (de) 1984-11-15

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