EP0489687B1 - Bohr- und Meisselgerät - Google Patents

Bohr- und Meisselgerät Download PDF

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Publication number
EP0489687B1
EP0489687B1 EP91810904A EP91810904A EP0489687B1 EP 0489687 B1 EP0489687 B1 EP 0489687B1 EP 91810904 A EP91810904 A EP 91810904A EP 91810904 A EP91810904 A EP 91810904A EP 0489687 B1 EP0489687 B1 EP 0489687B1
Authority
EP
European Patent Office
Prior art keywords
tool
switching element
actuating means
locking
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 - Lifetime
Application number
EP91810904A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0489687A1 (de
Inventor
Pacher Vinko
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.)
Hilti AG
Original Assignee
Hilti AG
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 Hilti AG filed Critical Hilti AG
Publication of EP0489687A1 publication Critical patent/EP0489687A1/de
Application granted granted Critical
Publication of EP0489687B1 publication Critical patent/EP0489687B1/de
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
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D2211/00—Details of portable percussive tools with electromotor or other motor drive
    • B25D2211/06—Means for driving the impulse member
    • B25D2211/062—Cam-actuated impulse-driving mechanisms
    • B25D2211/064—Axial cams, e.g. two camming surfaces coaxial with drill spindle

Definitions

  • the invention relates to a hand-held drilling and chiseling device with striking mechanism and tool holder, the striking mechanism emitting axial strikes via a striker onto a tool clamped in the tool holder and the striker having at least one recess into which a locking element is inserted by a switching element which is actuated from the outside by means of a Actuator is controllable, can be engaged.
  • a hammer shut-off is achieved by means of hook-shaped elements which can be inserted into a recess in the racket.
  • the racket is thus held in an ineffective end position so that it can no longer deliver axial blows to the tool.
  • hook-shaped elements can be moved in the radial direction.
  • An actuating means that can be operated from the outside has an eccentric deformation in the radial direction in an inner circumferential region, via which the axial stroke of a pin-shaped element can be controlled.
  • an axial movement of the pin-shaped element can be achieved, the pin-shaped element controlling the radial movement of the hook-shaped element.
  • the racket can only be locked in the foremost position, it must be designed in such a way that it can radially push apart the hook-shaped elements which are subjected to spring force in the radial direction over an inclined plane, so that they jump into a recess in the racket which adjoins the inclined plane can. Locking the racket is therefore only possible if the racket is moved in the machining direction by the striking mechanism.
  • the invention has for its object to provide a locking device through which the striker in impact-resistant Position can be shifted without having to commission the device.
  • the object is achieved in that the actuating means has at least one control cam which is arranged on the inside of the actuating means and serves to generate an axial movement of the switching element.
  • the movements of the actuating element are transmitted to the switching element by means of the control cam.
  • the control curve is preferably a helical groove.
  • Another advantage of the invention is that parts of the switching element engage in the helical groove. The guidance and the exact movement of the switching element in the actuating means are thus achieved.
  • the parts of the switching element are expediently arranged cams in the peripheral region of the switching element.
  • the shape of these cams preferably corresponds to the cross section and the slope of the helical groove.
  • the invention is particularly suitable for a drilling and chiseling device with a removable tool holder. Switching or switching off the field operation on the machine is not necessary. Especially when doing the same work, which extends over a longer period of time, it is advantageous if it is not always necessary to pay attention to whether the correct setting of the machine has been made.
  • the drilling and chiseling device with the front area shown in FIG. 1 has a guide sleeve 1.
  • This guide sleeve 1 is rotatably supported by two ball bearings 2 in a device housing 3.
  • the stop shoulder for one of the ball bearings 2 in the device housing 3 is formed by a locking ring 3a.
  • a pneumatic percussion mechanism with percussion piston which is known per se and is therefore not shown in the drawing, is arranged in the rear region of the guide sleeve 1.
  • an anvil 4 is slidably mounted in the front area of the guide sleeve 1.
  • This striker 4 has toothing 4a which transmits rotation and torque.
  • a circumferential groove 5 is arranged on the die 4.
  • the profile of the groove 5 is preferably semicircular and corresponds to that Profile of the locking element 6, which is a ball in this embodiment.
  • a tool holder 10 specially designed for pure rotary movement has a recess 11a in the rear area.
  • an internal toothing which is complementary to the toothing 4a of the striker 4.
  • the unlocked locking element 6 is located in the central region of the recess of the tool holder shaft 11. This can be a plurality of locking elements 6.
  • An arrangement is preferably to be made in which three locking elements 6 are each arranged at an angle of 120 ° in the peripheral region of the tool holder shaft 11.
  • the guide of the locking element 6 consists of a radial bore 11b in which the ball can be moved in the radial direction.
  • This bore 11b is arranged in the rear region of the tool holder shaft 11.
  • the diameter of the ball exceeds the wall thickness of the tool holder shaft 11 in the area of the rear recess 11a.
  • the switching element 7 has control means 7b with which the locking element 6 can be radially engaged or disengaged from the locking element 6. Since an arrangement of a plurality of locking elements 6 in the circumferential direction is possible, a plurality of locking elements 6 can also be controlled by the switching element 7.
  • the switching element 7 can be controlled from the outside by the actuating element 8.
  • the shape of the switching element 7 is essentially cylindrical and essentially axially displaceable within the actuating means 8. At least one cam 7a is arranged in the peripheral region of the switching element 7.
  • the actuating element 8 has helical grooves 9 on its inside, which have an essentially rectangular cross section. According to this cross section the cams 7a are complementary and engage in helical grooves 9. At the beginning and at the end of these grooves 9, an area 9a extends without an incline. This area 9a forms a self-locking against rotation of the actuating means 8 with respect to the switching element 7 under axial load.
  • the striker 4 is brought into an ineffective position and locked there.
  • FIG. 2 shows the locking element 6, which is inserted into the circumferential groove 5 of the striker 4.
  • the switching element 7 is axially displaced by rotating the actuating means 8. Since the switching element 7 is connected to the tool holder shaft 11 and the die 4 via the locking element 6, all of these parts move axially when the actuating means 8 is rotated.
  • the striker 4 is pulled into the non-impact end position and held there. This means that machining can be carried out with the drilling and chiseling device, in which a pure rotary movement is necessary.
  • the switching element 7 is located at the rear end of the actuating means 8.
  • the locking element 6 in the form of a ball is unlocked.
  • the tool holder shaft 11 is pushed onto the front part of the striker 4, so that the two toothings 4a, 11a interlock.
  • an intermediate disk 16 is arranged in an enlarged circumferential recess 17, which is fixed in the recess 17 with retaining rings 16a.
  • the washer 16 has a stop collar 16b, which is supported on the end face 1a of the guide sleeve 1.
  • the switching element 7 rotates with the actuating means 8.
  • the position of the switching element 7 which is achieved in this way corresponds at the same time to the locking position of the locking element 6.
  • a recess 12 is arranged on the helical groove base, into which a rotation-preventing element 13 of the switching element 7 can be inserted.
  • the anti-rotation element 13 is a spring-loaded ball, which is arranged in a recess 14 in the cam 7a of the switching element 7.
  • the recess 14 is arranged in the radial direction. The ball is guided in this recess 14 and presses on a spring 15 which is located within the recess 14 and is supported on the base of the recess 14.
  • the striker 4 is locked in the end position, which has no impact on the stroke.
  • the generated by the drive rotary movement transmitted by the striker 4 is transmitted from the striker 4 via the tool holder shaft 11 to a tool clamped in the tool holder 10.
  • the striker 4 is unlocked in the reverse order to that described above.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Percussive Tools And Related Accessories (AREA)
  • Lasers (AREA)
  • Drilling And Exploitation, And Mining Machines And Methods (AREA)
  • Drilling And Boring (AREA)
  • Polishing Bodies And Polishing Tools (AREA)
  • Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
  • Perforating, Stamping-Out Or Severing By Means Other Than Cutting (AREA)
EP91810904A 1990-12-01 1991-11-20 Bohr- und Meisselgerät Expired - Lifetime EP0489687B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4038395A DE4038395A1 (de) 1990-12-01 1990-12-01 Bohr- und meisselgeraet
DE4038395 1990-12-01

Publications (2)

Publication Number Publication Date
EP0489687A1 EP0489687A1 (de) 1992-06-10
EP0489687B1 true EP0489687B1 (de) 1993-07-14

Family

ID=6419398

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91810904A Expired - Lifetime EP0489687B1 (de) 1990-12-01 1991-11-20 Bohr- und Meisselgerät

Country Status (10)

Country Link
EP (1) EP0489687B1 (es)
JP (1) JPH04269107A (es)
AT (1) ATE91452T1 (es)
AU (1) AU640541B2 (es)
CA (1) CA2056545A1 (es)
DE (2) DE4038395A1 (es)
DK (1) DK0489687T3 (es)
ES (1) ES2041554T3 (es)
FI (1) FI915604A (es)
HU (1) HUT60180A (es)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4136584B4 (de) * 1991-11-07 2004-10-28 Hilti Ag Bohr- und Meisselgerät mit Werkzeugaufnahme
JP4552843B2 (ja) * 2005-12-09 2010-09-29 パナソニック電工株式会社 打撃工具用アダプター
DE102005059182A1 (de) * 2005-12-12 2007-06-14 Robert Bosch Gmbh Betriebsartenumschalter zum Einstellen mindestens einer Betriebsart in einer Handwerkzeugmaschine

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1195505A (en) * 1967-07-31 1970-06-17 Hilti Ag Hammer Drill
JPS5930607A (ja) * 1982-08-12 1984-02-18 Hitachi Koki Co Ltd 電気ハンマドリル
DE3627869A1 (de) * 1986-08-16 1988-02-18 Bosch Gmbh Robert Schlagwerkabschaltung

Also Published As

Publication number Publication date
HU913736D0 (en) 1992-03-30
DE59100191D1 (de) 1993-08-19
JPH04269107A (ja) 1992-09-25
ES2041554T3 (es) 1993-11-16
FI915604A0 (fi) 1991-11-28
ATE91452T1 (de) 1993-07-15
AU640541B2 (en) 1993-08-26
AU8831791A (en) 1992-06-04
EP0489687A1 (de) 1992-06-10
HUT60180A (en) 1992-08-28
FI915604A (fi) 1992-06-02
DE4038395A1 (de) 1992-06-04
CA2056545A1 (en) 1992-06-02
DK0489687T3 (da) 1993-11-29

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