EP0375917B1 - Perceuse - Google Patents

Perceuse Download PDF

Info

Publication number
EP0375917B1
EP0375917B1 EP89121362A EP89121362A EP0375917B1 EP 0375917 B1 EP0375917 B1 EP 0375917B1 EP 89121362 A EP89121362 A EP 89121362A EP 89121362 A EP89121362 A EP 89121362A EP 0375917 B1 EP0375917 B1 EP 0375917B1
Authority
EP
European Patent Office
Prior art keywords
catch
drilling machine
gear
machine according
drive member
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
EP89121362A
Other languages
German (de)
English (en)
Other versions
EP0375917A1 (fr
Inventor
Manfred Bleicher
Ulrich Dipl.-Ing.(Fh) Bohne
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.)
Robert Bosch GmbH
Original Assignee
Robert Bosch 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 Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP0375917A1 publication Critical patent/EP0375917A1/fr
Application granted granted Critical
Publication of EP0375917B1 publication Critical patent/EP0375917B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • B25D16/003—Clutches specially adapted therefor

Definitions

  • the invention is based on a drilling machine according to the preamble of claim 1.
  • a safety clutch for hand-held power tools such as rotary hammers is already known which, in addition to the two coupling elements, has a large number of further individual parts, such as cage, washers and bushings has, so that the entire coupling is complicated in construction and complex to assemble. If the coupling wears, both coupling halves must be replaced.
  • the drill according to the invention with the characterizing features of claim 1 has the advantage that it has a wear-resistant and easy-to-assemble safety coupling with a part-saving structure.
  • the design of the locking members causes friction, namely rolling friction, to occur only on one of the two coupling parts, namely on the more wear-resistant mating coupling part.
  • the gear is not worn out due to the clutch, even if it is made of a softer material such as sintered metal.
  • Figure 1 shows a cross section through a drilling machine according to the invention.
  • the drill 1 has in its housing 2 a motor, not shown, which drives an intermediate shaft 3.
  • a toothed wheel 5 engages with its spur toothing 6 in the toothing 4 of the intermediate shaft 3.
  • the gear wheel 5 has locking recesses 8. These are so deep that latching bodies 9 mounted therein preferably immerse at least halfway.
  • the locking bodies 9 are arranged as rollers with their axis to the gear 5 in the radial direction. Accordingly, the locking recesses 8 have a cylindrical jacket shape.
  • the gear wheel 5 is under the action of a compression spring 10, which is supported against a disk 13 fastened in a drive member 12.
  • the drive member 12 is designed as a rotating sleeve, which has a counter coupling part 14 on a collar, which is provided on its side facing away from the handle 2 with locking recesses 15.
  • tubular drive member 12 here is a z. B. housed in DE 31 21 616 A1 described percussion mechanism 16 with reciprocating piston 17.
  • the drive member 12 continues into the tool holder 18, where inward driving bars 19 are arranged which engage in rotary driving grooves 20 of the tool 21.
  • the tool holder corresponds to the known designs z. B. according to DE 25 51 125 C2 (US-A 41 07 949).
  • the locking rollers 9 can rotate in the locking recesses 8 about their own axis and roll on the mating coupling part 14 from the locking troughs 15. No wear can occur on the gear 5, so that a less wear-resistant material, such as, for. B. sintered metal can be used.
  • the cogging torque can be increased by the fact that the locking troughs 15 are cut deeper or the side walls of the locking troughs 15 are steep. The flatter the notches, the earlier the safety clutch responds.
  • the invention is not limited to the arrangement of a safety clutch at the point shown in the exemplary embodiment. Rather, the clutch can be arranged at any point in the rotary drive train. Any tool holders, in particular drill chucks, can also be used. In this case, the chuck jaws are rotatably connected to the drive member 12.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Percussive Tools And Related Accessories (AREA)
  • Earth Drilling (AREA)
  • Drilling And Boring (AREA)

Claims (7)

  1. Perceuse pour forer et ou battre avec un logement d'outil entraîné en rotation par un élément de commande et un embrayage de sécurité agissant axialement et situé dans le tronçon de commande de rotation, embrayage dont une partie est constituée d'une roue dentée avec des creux de blocage dans la face frontale, dans lesquels sont mis en place des corps de blocage et qui agissent de concert avec des cavités de blocage d'une contre pièce d'embrayage soumise à la charge d'un ressort, caractérisée
    - en ce que la roue dentée (5) est une pièce frittée,
    - en ce que les cavités de blocage (15) sont réalisées sensiblement plus plates, dans la contre pièce d'embrayage (14) que les creux de blocage (8) dans la roue dentée (5) et
    - en ce que les creux de blocage (8) constituent une cage monobloc avec la roue dentée (5) pour maintenir les corps de blocage (9).
  2. Perceuse selon la revendication 1, caractérisée en ce que les creux de blocage (8) dans la roue dentée (5) sont plus grands ou au moins de même grandeur que le demi-diamètre des corps de blocage (9).
  3. Perceuse selon une des revendications précédentes, caractérisée en ce que la contre pièce d'embrayage (14) forme une seule et même pièce avec la pièce de commande (12).
  4. Perceuse selon une des revendications précédentes, caractérisée en ce que le matériau de l'élément de commande (12) est nettement plus dur que celui de la roue dentée (5).
  5. Perceuse selon une des revendications précédentes, caractérisée en ce que les corps de blocage (9) sont réalisés en galets de blocage.
  6. Perceuse selon une des revendications précédentes, caractérisée en ce que lors du déclenchement de l'embrayage, les corps de blocage (9) se désenclenchent de la contre pièce d'embrayage (14) plus dure.
  7. Perceuse selon une des revendications précédentes, avec un outil de frappe, dont le piston commandé déplace par l'intermédiaire d'un coussin d'air enfermé, un percuteur en un mouvement de va et vient, le percuteur heurtant axialement l'outil et occasionnant les coups, caractérisée en ce que l'élément de commande (12) a une forme de tube et loge coaxialement l'outil de frappe (17) dans son intérieur.
EP89121362A 1988-12-30 1989-11-18 Perceuse Expired - Lifetime EP0375917B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3844311A DE3844311A1 (de) 1988-12-30 1988-12-30 Bohrmaschine
DE3844311 1988-12-30

Publications (2)

Publication Number Publication Date
EP0375917A1 EP0375917A1 (fr) 1990-07-04
EP0375917B1 true EP0375917B1 (fr) 1993-02-10

Family

ID=6370519

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89121362A Expired - Lifetime EP0375917B1 (fr) 1988-12-30 1989-11-18 Perceuse

Country Status (3)

Country Link
EP (1) EP0375917B1 (fr)
JP (1) JPH02212006A (fr)
DE (2) DE3844311A1 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4302083A1 (de) * 1993-01-19 1994-07-21 Black & Decker Inc Kraftgetriebenes Werkzeug, insbesondere Elektrowerkzeug
DE19717465B4 (de) * 1997-04-25 2005-08-04 Robert Bosch Gmbh Elektrowerkzeugmaschine
DE19903863A1 (de) * 1999-02-01 2000-08-24 Bosch Gmbh Robert Sicherheitskupplung
GB0213289D0 (en) * 2002-06-11 2002-07-24 Black & Decker Inc Rotary hammer
DE102004047470A1 (de) * 2004-09-30 2006-04-06 Robert Bosch Gmbh Handwerkzeugmaschine, insbesondere Bohr- und/oder Schlaghammer

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE424341C (de) * 1926-01-26 Automat Ind Ges M B H Bohr- und Gewindeschneidvorrichtung mit UEberlastungskupplung
DE2853293C2 (de) * 1978-12-09 1983-12-29 Jean Walterscheid Gmbh, 5204 Lohmar Überlastkupplung
US4373923A (en) * 1979-12-14 1983-02-15 Umc Industries Inc. Torque limiting overload coupling
DE8003571U1 (de) * 1980-02-11 1981-12-10 Hilti AG, 9494 Schaan Ueberlastkupplung zum uebertragen eines begrenzten drehmomentes
US4593800A (en) * 1983-02-22 1986-06-10 Helland Research & Engineering, Inc. Torque release drive connector
DE3503507A1 (de) * 1985-02-02 1986-08-07 Robert Bosch Gmbh, 7000 Stuttgart Bohrhammer

Also Published As

Publication number Publication date
JPH02212006A (ja) 1990-08-23
DE3844311A1 (de) 1990-07-05
DE58903533D1 (de) 1993-03-25
EP0375917A1 (fr) 1990-07-04

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