EP0189769A1 - Perforateur rotatif ou à percussion - Google Patents

Perforateur rotatif ou à percussion Download PDF

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Publication number
EP0189769A1
EP0189769A1 EP86100313A EP86100313A EP0189769A1 EP 0189769 A1 EP0189769 A1 EP 0189769A1 EP 86100313 A EP86100313 A EP 86100313A EP 86100313 A EP86100313 A EP 86100313A EP 0189769 A1 EP0189769 A1 EP 0189769A1
Authority
EP
European Patent Office
Prior art keywords
spring
ring
adjusting sleeve
hammer according
hammer
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
EP86100313A
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German (de)
English (en)
Other versions
EP0189769B1 (fr
Inventor
Willy Kress
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.)
Individual
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Individual
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Filing date
Publication date
Application filed by Individual filed Critical Individual
Publication of EP0189769A1 publication Critical patent/EP0189769A1/fr
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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 relates to a hammer drill or percussion hammer according to the preamble of the main claim.
  • rotary or percussion hammers of this type DE-OS 32 05 141; European patent application publication no. 0050 192
  • means are provided which enable the user to switch from percussion drilling operation, for example via a Swashplate drive or eccentric effect is achieved, thereby switching to the possibility of pure drilling operation - whereby the hammer drill can also be used as a drill - that you can disengage the swashplate drive used in the publications mentioned in a suitable manner.
  • the hub body of the Swashplate drive which in turn drives the air cushion hammer mechanism, via a spline toothing with an intermediate or countershaft in connection, which is driven continuously by the pinion of the driving electric motor, for example.
  • the intermediate shaft which is partially designed as a hollow shaft, is displaced axially against a coaxially internal spring so that the internal spline toothing of the hub body disengages from the external spline toothing of the intermediate shaft and reaches an undercut, as a result of which the hub body then remains without driving the intermediate shaft which continues to rotate and effects the drilling drive.
  • the intermediate shaft is displaced by rotating an actuating button, at the other end of which a switching eccentric is arranged, which presses on a crowned end of the intermediate shaft and displaces it.
  • a switching eccentric is arranged, which presses on a crowned end of the intermediate shaft and displaces it.
  • the rotating intermediate shaft rubs against the switching eccentric and when the operating button is returned to the starting position, the spline toothing of the intermediate shaft and the hub body can mesh again, provided, however, that tooth is not on tooth, which makes the intervention problematic. It is then, as is also the case with most of such switch-over-enabled clutches and gear adjustments, that the user turns around on the drill head to another, more favorable position for engaging the clutch teeth or Achieve spline longitudinal grooves.
  • the invention is therefore based on the object, in particular in the case of a rotary hammer or percussion hammer or a similar electric (hand) tool, to provide a coupling mechanism which can be rotated fully into the respective disengaged or engaged position by external manual action, for example on a rotary knob, without any obstacles resulting from a possible "tooth-on-tooth standing" at this point and which is also designed so that the actuator for (engages - disengages) the pressure in one of the operating positions without the need for constant maintenance the switchover also eliminates any need to prepare or enable the clutch to be engaged or disengaged, for example by turning additional parts accessible from the outside.
  • a further advantage of an embodiment of the present invention becomes apparent when one considers the displacement of the adjusting sleeve for engaging or disengaging on the countershaft in connection with a particularly simple actuator design for the manual actuation which brings about the changeover; a driving lug engages on an intermediate sliding member performing a linear displacement from the actuator into an annular groove of the adjusting sleeve and can move it axially in the desired direction, the actual rotary handle element, on which the user manually engages, in each case fully rotated into one or the other position can be without, even in the worst case, obstacles or blocking effects for switching.
  • the basic idea of the present invention is to equip the axially displaceable for effecting the clutch engagement on the countershaft, which is always in spline engagement with the sliding sleeve or clutch adjusting sleeve, hereinafter only referred to as the adjusting sleeve, even with axially displaceable driving pins, preferably by a ring spring trained and at least in partial groove areas on the adjusting sleeve bias spring loaded axially in the coupling direction, so that it is possible from the manual actuator the coupling to move the sleeve fully to its coupling position, even if the coupling does not take place immediately, because the remaining travel length is absorbed by the axially moving driving pins and their pretensioning spring (s) and at a later time, for example when the machine goes into idle mode, is automatically engaged without the need for manual intervention or any other action by the user.
  • the housing can be divided in the longitudinal direction in the usual way, that is to say it can be designed as a double-shell housing, with at least one axial intersection or separation point, which is designated by A; with longitudinal screws 11 and 12 (see FIG. 2), which are inserted into corresponding lateral recesses in the rear housing half 10a and screwed into internal projections of the front housing half 10b and tightened.
  • the drive motor with fan wheel 13, rotor 14 with motor drive shaft 15, carbon guides 16a, 16b and ball bearings 17 and 18 on both sides is shown at 12; further down in the handle are some electronic or electrical switching elements u. Like., Which are designated together with 19 and will not be discussed in the following because they do not ge to the invention Listen.
  • the drive pinion 20 of the motor shaft 15 is in engagement with a toothed wheel 21, which is fixedly arranged on an intermediate or countershaft 22 for the percussion drive and the drive of a drill spindle sleeve 23 (cf. also the partial representation of FIG. 3, in particular the area of the countershaft and the impact drive shows more precisely).
  • a toothed wheel 21 which is fixedly arranged on an intermediate or countershaft 22 for the percussion drive and the drive of a drill spindle sleeve 23 (cf. also the partial representation of FIG. 3, in particular the area of the countershaft and the impact drive shows more precisely).
  • 24 denotes a plurality of bearing and guiding tasks
  • the cylinder flange is made of aluminum and can be produced by injection molding or die casting and forms an inner guide sliding bore 25 for slidably supporting the over an eccentric effect driven, in the guide bore 25 reciprocating working or drive piston 26.
  • the forward, that is to the tool and left in the drawing plane tubular guide region of the cylinder flange 24 is surrounded by a drill spindle sleeve 27, which in the housing for example via a needle bearing indicated at 28 and a front ball bearing 29 is rotatably and axially immovable.
  • gear twin 30 On the rear part of the drill spindle sleeve 27, which widens somewhat in this embodiment, sits a gear twin 30, axially displaceable but non-rotatably in a suitable embodiment, for example, longitudinally displaceable by longitudinal grooves, the longitudinal displaceability of the two gear wheels 30a, 30b serving to change gear.
  • Fig. 3 can be seen that the countershaft 22 is stationary on both sides via needle bearings 31, 32 in the housing, but of course rotatably mounted and in the region of the gear twin 30 has a corresponding gear pair from the gears 32a, 32b, which is rotationally fixed and axially immovable the countershaft 22 are attached.
  • a second switchover option - how the switchover or the actuators provided for this switchover of the machine elements and parts moved here by an axial displacement will be explained in more detail below - then results from the additionally provided possibility that seen in itself with such hammer drills, it is also known to optionally switch the percussion drive on or off.
  • an eccentric shaft 37 is rotatably mounted transversely to the countershaft 22 in a bearing 36 fastened to the cylinder flange 24, the eccentric shaft 37 supporting an eccentric pivot pin 39 at its upper end and a helical gear 40 at its lower end, which meshes with another gear 41, which is freely rotatable, but axially immovable on the countershaft 22.
  • a coupling sleeve or adjusting sleeve 42 is provided for driving the eccentric shaft 37 in rotation, which results in the impact effect in a manner which will be explained briefly below, which is shown in greater detail in the illustration of FIGS. 5a, b and c.
  • the adjusting sleeve 42 as it will only be referred to below, is non-rotatably arranged on the countershaft 22, but is axially displaceable, for example by means of a corresponding spline toothing, and can be moved in the direction of the freely rotating gear 41.
  • the adjusting sleeve 42 has at least one, preferably two or possibly also even more, driving pins 43, 44 which are diametrically opposed in the case of only two driving pins.
  • a connecting rod 45 acting like a connecting rod is between the eccentric pin 39 is provided on the eccentric shaft 37 and the working or drive piston 26 which slides in the guide bore 25 of the cylinder flange 24.
  • An essential feature of the present invention is the special clutch mechanism for driving the percussion drive 37, 39, 45, 26, 46, as it is formed by the adjusting sleeve 42 in the area of the countershaft.
  • FIG. 5a shows at 43a and 44a in this exemplary embodiment two guide bores offset from the center, in which the driving pins 43, 44, or, in general terms, the driving elements, since of course no round pin shape is required and these are also rectangular or can be guided with any cross-section in the bores 43a, 44a, - sit axially displaceable.
  • the guide bores 43a, 44a are each offset, so form at 70 inwardly projecting ring shoulders, so that it is ensured that the correspondingly complementary driving pins 43, 44 cannot fall through the guide bores in the coupling direction, that is to say in the plane of the drawing in FIG. 3, to the right .
  • the axial securing on the other side and at the same time the resilient bias that is exerted for the clutch engagement on the driving pins 43, 44 is generated by the fact that on the rear end, i.e. the left end of the driving pin in the plane of the drawing an axial prestressing force is exerted on an annular spring seated on the adjusting sleeve 42.
  • This ring spring is denoted by 71 and in this particularly simple, inexpensive and equally reliable embodiment consists of a closed ring made of a suitable elastomeric material, which is inserted into an adjacent groove 72 in the adjusting sleeve.
  • This ring spring 71 is preferably a so-called O-ring known per se; to accommodate it, the adjusting sleeve, as can best be seen from the illustration in FIGS. 5b and 5c, forms a projection 73 on the left in the plane of the drawing, which merges into a widened head part 74, so that the receiving groove 72 for the ring spring 71 is formed; however, this groove is only present where the cantilevered head part does not hinder the free, spring-loaded mobility of the driving pins 43, 44; in other words, where the guide bores 44a, 43a are located, the overlap of the annular groove 72 or the head part is left out cut away so that the elastomeric ring inserted into the remaining groove areas - these can best be seen in the illustration in FIG.
  • the ring spring 71 bulges in this case at the points not covered by the ring groove 72 to the rear, but is held unchanged by the groove areas, also because of its own radial prestress, and exerts constant axial pressure on the driving pins 43, 44 therein Quasi coupling position of the adjusting sleeve 42. If the electric motor is rotated in this position, for example by actuating a starter push handle on the rotary hammer, then the gears involved in this coupling process automatically set themselves correctly at some point, and the driving pins snap into the corresponding recesses on the counter gear 41, or with each other relative displacement between gear 41 and adjusting sleeve 42, caused in whatever way.
  • the ring spring 71 also any other suitable configuration and can have any other suitable structure, provided that it can sit radially in the receiving groove 72 of the adjusting sleeve 42 and can exert corresponding axial forces on the driving pins, which can otherwise remain comparatively small, since it is only necessary to place them in the corresponding counter - Push openings of the gear 41 axially and then no retroactive forces occur while maintaining this (engaged) operating state.
  • annular spring 71 also made of a suitable metallic material, for example a tension spring forming a self-contained ring, that is to say constructed of individual spring bonds, as is any and all exerting the required axial engagement pressure on the driving pins the adjusting sleeve 42 can be fastened spring is suitable for this.
  • a suitable metallic material for example a tension spring forming a self-contained ring, that is to say constructed of individual spring bonds, as is any and all exerting the required axial engagement pressure on the driving pins the adjusting sleeve 42 can be fastened spring is suitable for this.
  • each driving pin 43, 44 in its guide its own small preload tension or spiral spring or, if appropriate, also to use leaf springs which, as indicated by dashed lines at 76, can be embodied at 76a are firmly attached, for example by spot welding, to the adjusting sleeve 42 and hold the driving pin in position by axial pressure.
  • a particularly advantageous embodiment of the present invention finally results in connection with the actuator described in the schematic representation of FIGS. 6 and 7, which is the manual Switching from the outside is made possible by the user.
  • the actuator In order to carry out the engagement movement or any switch-over adjustment movements with electric (hand) tools, the actuator is designed as schematically explained with reference to the representations of FIGS. 6 and 7, which will be discussed below.
  • the rotary handle element accessible to an external manual actuation is designated by 50; it is rotatable, but otherwise immovably mounted in a suitable manner in the housing, in a preferred embodiment such that either a projecting edge flange on the rotary handle element 5 p is at least partially inherently - 6, a housing ring projection 51 engages in an at least partially circumferential outer ring groove 52 on the rotary handle element 50.
  • a particularly preferred embodiment can then arise in a further development of the present invention in that the twist grip element is used where
  • housing interface A there is a housing interface A, where two housing part halves 10a, 10b to be connected to one another for final assembly are connected to one another in the longitudinal direction or laterally to form a dividing line or parting line and joined together.
  • housing wall parts projecting lips on one side and grooves on the other, so that the housing halves can be assembled to fit.
  • partial circle cutouts 55a, 55b are provided at the point at which rotary handle elements for the actuator are to be arranged in the adjoining housing halves (at least in the case of a round rotary handle element), which complement one another when the housing is assembled to form a cut-out full circle. It is then only necessary to provide the adjacent end faces of the full circle or the housing part circle halves 55a, 55b or the twist grip element with "grooves and tongues" and to use the twist grip element accordingly when the housing halves are joined, as a result of which this is then finally stored.
  • an intermediate slide member 56 is arranged adjacent to it within the housing, which is mounted in a suitable, completely free manner, optionally by suitable or correspondingly arranged housing projections and ribs, so that this is a sliding movement can only perform in the double direction of arrows B and C, as shown in FIG. 6.
  • there is an engagement pin 57 on the rotary handle element 50 which engages in an elongated hole 58 on the intermediate sliding member 56, which extends in the transverse direction to the desired displacement direction generating the adjustment movement.
  • This subcomponent can therefore be, for example, the adjusting sleeve 42 shown in more detail in FIG. 3, but also the axially displaceable twin gearwheel 30 for changing gear.
  • twist grip elements 50a, 50b which are inserted centrally on both sides of the housing separation point A, are guided on their outer ring edge to carry out the rotational adjustment movement through the housing ring cutouts lying here and engage behind 61 ring recesses or simply housing cutout end regions with inner ring flanges, the respective engagement pin 57a, 57b depending on the extent the desired adjustment movement is mounted more or less eccentrically;
  • the twist grip elements 50a, 50b which are inserted centrally on both sides of the housing separation point A, are guided on their outer ring edge to carry out the rotational adjustment movement through the housing ring cutouts lying here and engage behind 61 ring recesses or simply housing cutout end regions with inner ring flanges, the respective engagement pin 57a, 57b depending on the extent the desired adjustment movement is mounted more or less eccentrically;
  • the two intermediate sliding members 56a, 56b can be of quite different shape, the intermediate sliding member 56a responsible for the gear changeover initially engaging over the smaller gear 30b of the twin gear 30 and then engages in the groove arranged between the two gears 30a, 30b for adjustment.
  • the lower intermediate sliding member has a driving lug 59b arranged in the central region, which engages in the annular groove 62 of the adjusting sleeve 42 enlarged in FIG. 5. As shown in FIG.
  • the twist grip elements can be inserted into the housing of the electric (hand) tool in such a way that they do not protrude beyond the outline of the housing, so that the entire device acquires a pleasing appearance, with corresponding recessed grips 63, for example with an intermediate bridge, for smooth adjustment.
  • the twist grip elements with ring flanges 64 overlapping the outer housing ring regions, so that a secure hold for the twist grip elements is achieved together with the inner projecting ring flanges or ring grooves receiving housing ring flanges.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Percussive Tools And Related Accessories (AREA)
EP86100313A 1985-01-31 1986-01-11 Perforateur rotatif ou à percussion Expired - Lifetime EP0189769B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3503172 1985-01-31
DE19853503172 DE3503172A1 (de) 1985-01-31 1985-01-31 Bohr- oder schlaghammer

Publications (2)

Publication Number Publication Date
EP0189769A1 true EP0189769A1 (fr) 1986-08-06
EP0189769B1 EP0189769B1 (fr) 1991-05-08

Family

ID=6261223

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86100313A Expired - Lifetime EP0189769B1 (fr) 1985-01-31 1986-01-11 Perforateur rotatif ou à percussion

Country Status (2)

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EP (1) EP0189769B1 (fr)
DE (2) DE3503172A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009083307A1 (fr) * 2007-12-21 2009-07-09 Robert Bosch Gmbh Machine-outil dotée d'un dispositif de transmission comportant au moins un arbre intermédiaire logé de façon rotative
CN103240443B (zh) * 2013-04-17 2016-08-10 河海大学 弹簧直角型钢桥裂纹修复钻孔机
CN111376214A (zh) * 2018-12-28 2020-07-07 南京德朔实业有限公司 电动工具

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4003029A1 (de) * 1990-02-02 1991-08-08 Bosch Gmbh Robert Handgefuehrte werkzeugmaschine mit radialgeblaese
DE4016774A1 (de) * 1990-05-25 1991-11-28 Bosch Gmbh Robert Von hand fuehrbare elektrische werkzeugmaschine
DE4205840C2 (de) * 1992-02-26 1996-10-24 Kress Elektrik Gmbh & Co Bohrhammer mit Meißelfunktion
DE4305965C2 (de) * 1993-02-26 1997-08-21 Kress Elektrik Gmbh & Co Schaltvorrichtung zur Spindelarretierung für Elektrowerkzeuge
DE102008055057A1 (de) * 2008-12-22 2010-06-24 Robert Bosch Gmbh Werkzeugmaschine, insbesondere handgehaltene Werkzeugmaschine

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2966974A (en) * 1958-07-28 1961-01-03 Walter B Paskowski Clutch
FR2218972A1 (fr) * 1973-02-26 1974-09-20 Skil Nederland Nv
FR2396155A1 (fr) * 1977-06-27 1979-01-26 Hilti Ag Marteau perforateur avec porte-outil blocage
DE3018633A1 (de) * 1980-05-16 1981-11-19 Wacker-Werke Gmbh & Co Kg, 8077 Reichertshofen Elektrobohrhammer mit abschaltbarem bohrantrieb
DE3213672A1 (de) * 1982-04-14 1983-10-20 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt Stellglied zum umschalten von elektrowerkzeugen vom betriebszustand "bohren" auf den betriebszustand "hammerbohren oder schlagbohren" und umgekehrt
GB2136722A (en) * 1983-03-21 1984-09-26 Hilti Ag Electro-pneumatic hammer drill
DE3311263A1 (de) * 1983-03-28 1984-10-04 Hilti Ag, Schaan Handgeraet mit zweiganggetriebe

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3224050A1 (de) * 1982-06-28 1983-12-29 Black & Decker, Inc. (eine Gesellschaft n.d.Ges.d. Staates Delaware), 19711 Newark, Del. Antriebsvorrichtung fuer das schlagwerk eines schlag- oder bohrhammers

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2966974A (en) * 1958-07-28 1961-01-03 Walter B Paskowski Clutch
FR2218972A1 (fr) * 1973-02-26 1974-09-20 Skil Nederland Nv
FR2396155A1 (fr) * 1977-06-27 1979-01-26 Hilti Ag Marteau perforateur avec porte-outil blocage
DE3018633A1 (de) * 1980-05-16 1981-11-19 Wacker-Werke Gmbh & Co Kg, 8077 Reichertshofen Elektrobohrhammer mit abschaltbarem bohrantrieb
DE3213672A1 (de) * 1982-04-14 1983-10-20 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt Stellglied zum umschalten von elektrowerkzeugen vom betriebszustand "bohren" auf den betriebszustand "hammerbohren oder schlagbohren" und umgekehrt
GB2136722A (en) * 1983-03-21 1984-09-26 Hilti Ag Electro-pneumatic hammer drill
DE3311263A1 (de) * 1983-03-28 1984-10-04 Hilti Ag, Schaan Handgeraet mit zweiganggetriebe

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009083307A1 (fr) * 2007-12-21 2009-07-09 Robert Bosch Gmbh Machine-outil dotée d'un dispositif de transmission comportant au moins un arbre intermédiaire logé de façon rotative
CN103240443B (zh) * 2013-04-17 2016-08-10 河海大学 弹簧直角型钢桥裂纹修复钻孔机
CN111376214A (zh) * 2018-12-28 2020-07-07 南京德朔实业有限公司 电动工具
CN111390843A (zh) * 2018-12-28 2020-07-10 南京德朔实业有限公司 电动工具及其控制方法

Also Published As

Publication number Publication date
EP0189769B1 (fr) 1991-05-08
DE3503172A1 (de) 1986-08-07
DE3679073D1 (de) 1991-06-13

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