EP0135654B1 - Guide of the piston of a hand-held air cushion percussion drill - Google Patents

Guide of the piston of a hand-held air cushion percussion drill Download PDF

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Publication number
EP0135654B1
EP0135654B1 EP84103852A EP84103852A EP0135654B1 EP 0135654 B1 EP0135654 B1 EP 0135654B1 EP 84103852 A EP84103852 A EP 84103852A EP 84103852 A EP84103852 A EP 84103852A EP 0135654 B1 EP0135654 B1 EP 0135654B1
Authority
EP
European Patent Office
Prior art keywords
piston
guide
air cushion
plate
percussion 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.)
Expired
Application number
EP84103852A
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German (de)
French (fr)
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EP0135654A1 (en
Inventor
Wilhelm Dipl.-Ing. Geis
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.)
Techtronic Industries GmbH
Original Assignee
Licentia Patent Verwaltungs 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 Licentia Patent Verwaltungs GmbH filed Critical Licentia Patent Verwaltungs GmbH
Publication of EP0135654A1 publication Critical patent/EP0135654A1/en
Application granted granted Critical
Publication of EP0135654B1 publication Critical patent/EP0135654B1/en
Expired legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D11/00—Portable percussive tools with electromotor or other motor drive
    • B25D11/06—Means for driving the impulse member
    • B25D11/062—Means for driving the impulse member comprising a wobbling mechanism, swash plate

Definitions

  • Anti-rotation device of the air-cushion hammer mechanism piston of a hand-held hammer drill wherein the piston pneumatically sets an axially freely movable impact body in a to-and-fro movement, which delivers its energy in the form of axial impacts to a tool guided in the hammer drill, and the piston being driven by one Electric motor is set into a swinging movement via a wobble body, which has a radially extending plunger which is provided with a spherically rounded head part which is mounted in the piston of the air cushion percussion mechanism
  • a rotation lock of the drive piston which is realized in this way is complex.
  • the invention has for its object in an electropneumatic hammer drill, in which the drive piston (air cushion hammer piston) is moved back and forth via a wobble body and the wobble body has a radially extending plunger, which has a spherically rounded, in the rear part of the drive piston mounted head part to secure the drive piston against rotation with a minimum of effort.
  • This object is achieved in that the radially extending plunger of the wobble body is guided in a plate having a slot-shaped opening, arranged in a guide projection of the air cushion hammer piston.
  • a bearing sleeve made of a suitable material in the guide shoulder of the air cushion hammer piston for example made of light metal, hereinafter referred to as the drive piston, and the plate between the upper end face of the bearing sleeve and a projection in the guide shoulder to arrange.
  • the plate provided with the slot-shaped opening or with a slot can also be attached in the lower region of the guide projection of the drive piston and can also form an integral unit with the guide sleeve, which is firmly attached in the guide projection.
  • the hollow piston 1, which sets the axially freely movable impact body 2 in a back and forth movement via an air cushion, contains at its rear end a guide projection 3, in which a bearing sleeve 4 (ring) is inserted.
  • a bearing sleeve 4 ring
  • the spherically rounded head 5 of a plunger 6 is guided, which, extending radially, is attached to the outer ring 7 of a ball bearing 8, which is inclined at an angle to the axis 9 of the countershaft 10, which is inclined accordingly extending seat 11 for the ball bearing 8 provided shaft piece 12 carries and drives.
  • the plunger 6 has a pin 13 protruding beyond the rounded head part 5, which is guided in an elongated opening 14 in a plate 15.
  • the plate 15 is here between the upper end face 4 'of the sleeve or the ring 4 and a projection 16 of the guide projection and fixed.
  • This measure ensures that the tangential movement of the plunger 6 or. its pin 13 is restricted so that a rotational movement of the hollow piston 1 is prevented.
  • the countershaft 10 is driven in a known manner via a gearwheel which engages with the pinion of the armature shaft of the electric motor.
  • FIG. 2 The immediate; lateral limitation of the pin 13 of the plunger 6 through the opening or slot 14 in the plate 15 and the anchoring of the plate 15 between the projection 16 of the guide projection 3 including the arrangement of the bearing sleeve 4 in the guide projection can be seen in FIG. 2, while FIG. 3 the shape of the plate 15 with the slot-like opening 14 illustrates.
  • the anti-rotation of the drive piston according to the invention requires only very little effort and has the particular advantage that the length of the opening 14 can be dimensioned relatively small because the drive piston 1 moves with it.

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

Description

Verdrehsicherung des Luftpolsterschlagwerk-Kolbens einer handgeführten Hammerbohrmaschine, wobei der Kolben auf pneumatischem Weg einen axial frei beweglichen Schlagkörper in eine Hin- und Herbewegung versetzt, der seine Energie in Form von Axialschlägen an ein in der Hammerbohrmaschine geführtes Werkzeug abgibt, und wobei der Kolben von einem Elektromotor über einen Taumelkörper in eine schwingende Bewegung versetzt wird, der einen sich radial erstreckenden Stößel aufweist, welcher mit einem sphärisch gerundeten Kopfteil versehen ist, das im Kolben des Luftpolsterschlagwerks gelagert istAnti-rotation device of the air-cushion hammer mechanism piston of a hand-held hammer drill, wherein the piston pneumatically sets an axially freely movable impact body in a to-and-fro movement, which delivers its energy in the form of axial impacts to a tool guided in the hammer drill, and the piston being driven by one Electric motor is set into a swinging movement via a wobble body, which has a radially extending plunger which is provided with a spherically rounded head part which is mounted in the piston of the air cushion percussion mechanism

Bei einer durch die US-A- 3.650.336 bekannt gewordenen Hammerbohrmaschine dieser Art ist der Führungszylinder an seiner Innenwandung mit einem Keilnabenprofil versehen, und der Antriebskolben weist an seiner Außenseite ein mit dem Keilnabenprofil zusammenwirkendes Keilwellenprofil auf. Durch diese Keilverzahnung ist der Antriebskolben gegen Verdrehen gesichert:In a hammer drill of this type which has become known from US-A-3,650,336, the guide cylinder is provided on its inner wall with a spline profile and the drive piston has on its outside a spline profile which interacts with the spline profile. This spline ensures that the drive piston is prevented from rotating:

Eine auf diese Weise verwirklichte Verdrehsicherung des Antriebskolbens ist aufwendig.A rotation lock of the drive piston which is realized in this way is complex.

Der Erfindung liegt die Aufgabe zugrunde bei einem elektropneumatisch arbeitenden Bohrhammer, bei welchem der Antriebskolben (Luftpolsterschlagwerk-Kolben) über einen Taumelkörper in eine Hin- und Herbewegung versetzt wird und der Taumelkörper einen sich radial erstreckenden Stößel besitzt, der ein sphärisch gerundetes, im hinteren Teil des Antriebskolbens gelagertes Kopfteil aufweist, den Antriebskolben mit einem Geringstmaß an Aufwand gegen Verdrehen zu sichern.The invention has for its object in an electropneumatic hammer drill, in which the drive piston (air cushion hammer piston) is moved back and forth via a wobble body and the wobble body has a radially extending plunger, which has a spherically rounded, in the rear part of the drive piston mounted head part to secure the drive piston against rotation with a minimum of effort.

Diese Aufgabe ist erfindungsgemäß dadurch gelöst, daß der sich radial erstreckende Stößel des Taumelkörpers in einem einen langlochförmigen Durchbruch aufweisenden, in einem Führungsansatz des Luftpolsterschlagwerk-Kolbens angeordneten Teller geführt ist.This object is achieved in that the radially extending plunger of the wobble body is guided in a plate having a slot-shaped opening, arranged in a guide projection of the air cushion hammer piston.

Aus Herstellungs- und Verschleißgründen hat es sich als zweckmäßig erwiesen, in den Führungsansatz des beispielsweise aus Leichtmetall bestehenden Luftpolsterschlagwerk-Kolbens, im folgenden mit Antriebskolben bezeichnet, eine Lagerhülse aus geeignetem Material einzusetzen und den Teller zwischen der oberen Stirnfläche der Lagerhülse und einem Vorsprung im Führungsansatz anzuordnen.For manufacturing and wear reasons, it has proven to be expedient to use a bearing sleeve made of a suitable material in the guide shoulder of the air cushion hammer piston, for example made of light metal, hereinafter referred to as the drive piston, and the plate between the upper end face of the bearing sleeve and a projection in the guide shoulder to arrange.

Alternativ kann der mit dem langlochförmigen Durchbruch bzw. mit einem Schlitz versehene Teller auch im unteren Bereich des Führungsansatzes des Antriebskolbens angebracht sein und mit der Führungshülse auch eine einstückige Einheit bilden, die im Führungsansatz fest angebracht ist. Die Erfindung wird im nachstehenden anhand der Zeichnung, die ein bevorzugtes Ausführungsbeispiel veranschaulicht, erläutert.Alternatively, the plate provided with the slot-shaped opening or with a slot can also be attached in the lower region of the guide projection of the drive piston and can also form an integral unit with the guide sleeve, which is firmly attached in the guide projection. The invention is explained below with reference to the drawing, which illustrates a preferred embodiment.

Es zeigen: Fig. 1 einen Teilschnitt durch den Antriebskolben mit dem diesem zugeordneten Taumelantrieb,

  • Fig. 2 eine Ansicht längs des Schnittes A-B durch Fig.1,
  • Fig. eine Draufsicht auf den Antriebskolben gemäß Fig. 1 in Richtung C.
1 shows a partial section through the drive piston with the wobble drive assigned to it,
  • 2 is a view along the section AB through Fig.1,
  • 1 is a plan view of the drive piston according to FIG. 1 in the direction C.

Wie aus Fig. 1 ersichtlich ist, enthält der Hohlkolben 1, der den axial frei beweglichen Schlagkörper 2 über ein Luftpolster in eine Hin-und Herbewegung versetzt, an seinem rückwärtigen Ende einen Führungsansatz 3, in welchen eine Lagerhülse 4 (Ring) eingesetzt ist. In der Lagerhülse 4 ist der sphärisch gerundete Kopf 5 eines Stößels 6 geführt, der, sich radial erstreckend, am Außenring 7 eines Kugellagers 8 angebracht ist, das unter einen Winkel geneigt zur Achse 9 der Vorgelegewelle 10 angeordnet ist, die ein mit einem entsprechend schräg verlaufenden sitz 11 für das Kugellager 8 versehenes Wellenstück 12 trägt und antreibt. Der stößel 6 weist einen über das gerundete Kopfteil 5 hinausragenden Zapfen 13 auf, der in einem langlochförmigen Durchbruch 14 eines Tellers 15 geführt ist. Der Teller 15 ist hier zwischen der oberen Stirnfläche 4' der Hülse oder des Rings 4 und einem Vorsprung 16 des Führungsansatzes angeordnet und fixiert.As can be seen from FIG. 1, the hollow piston 1, which sets the axially freely movable impact body 2 in a back and forth movement via an air cushion, contains at its rear end a guide projection 3, in which a bearing sleeve 4 (ring) is inserted. In the bearing sleeve 4, the spherically rounded head 5 of a plunger 6 is guided, which, extending radially, is attached to the outer ring 7 of a ball bearing 8, which is inclined at an angle to the axis 9 of the countershaft 10, which is inclined accordingly extending seat 11 for the ball bearing 8 provided shaft piece 12 carries and drives. The plunger 6 has a pin 13 protruding beyond the rounded head part 5, which is guided in an elongated opening 14 in a plate 15. The plate 15 is here between the upper end face 4 'of the sleeve or the ring 4 and a projection 16 of the guide projection and fixed.

Durch diese Maßnahme wird erreicht, daß die Tangentialbewegung des Stößels 6-bzw. seines Zapfens 13 so eingeschränkt ist, daß eine Drehbewegung des Hohlkolbens 1 verhindert ist.This measure ensures that the tangential movement of the plunger 6 or. its pin 13 is restricted so that a rotational movement of the hollow piston 1 is prevented.

Der Antrieb der Vorgelegewelle 10 erfolgt in bekannter Weise über ein mit dem Ritzel der Ankerwelle des Elektromotors im Eingriff stehendes Zahnrad.The countershaft 10 is driven in a known manner via a gearwheel which engages with the pinion of the armature shaft of the electric motor.

Die unmittelbare; seitliche Begrenzung des Zapfens 13 des Stößels 6 durch den Durchbruch bzw. Schlitz 14 im Teller 15 sowie die Verankerung des Tellers 15 zwischen dem Vorsprung 16 des Führungsansatzes 3 einschließlich der Anordnung der Lagerhülse 4 im Führungsansatz ist Fig. 2 zu entnehmen, während Fig. 3 die Form des Tellers 15 mit dem schlitzartigen Durchbruch 14 verdeutlicht. Die Verdrehsicherung des Antriebskolbens nach der Erfindung benötigt nur einen sehr geringen Aufwand und weist den besonderen Vorteil auf, daß die Länge des Durchbruchs 14 verhältnismäßig gering bemessen werden kann,weil sich der Antriebskolben 1 mitbewegt.The immediate; lateral limitation of the pin 13 of the plunger 6 through the opening or slot 14 in the plate 15 and the anchoring of the plate 15 between the projection 16 of the guide projection 3 including the arrangement of the bearing sleeve 4 in the guide projection can be seen in FIG. 2, while FIG. 3 the shape of the plate 15 with the slot-like opening 14 illustrates. The anti-rotation of the drive piston according to the invention requires only very little effort and has the particular advantage that the length of the opening 14 can be dimensioned relatively small because the drive piston 1 moves with it.

Claims (4)

1. Guide of the piston of a hand-held air cushion percussion drill, with the piston (1) pneumatically causing reciprocation of an axially freely movable striking member (2) which delivers its energy in the form of axial blows to a tool guided in the percussion drill, and with the piston (1) being made to oscillate by an electric motor via a wobble member comprising a radially extending ram (6) having a spherically rounded head portion (5) mounted in the piston (1) of the air cushion striking mechanism, characterised in that the radially extending ram (6, 13) of the wobble member is guided in a plate (15) which exhibits an aperture (14) of elongate hole configuration and is arranged in a guide extension (3) of the air cushion striking mechanism piston (1).
2. Guide as defined in Claim 1, characterised in that the ram (6) of the wobble member is provided with a journal (13) which extends beyond the rounded head portion (5) and is guided in the plate (15).
3. Guide as defined in Claims 1 and 2, characterised in that the plate (15) is arranged between the upper end face of a bearing sleeve (4) arranged in the guide extension (3) of the drive member and a projection (16) in the guide extension.
4. Guide as defined in Claims 1 and 2, characterised in that the plate (15) provided with the aperture (14) of elongate hole configuration is a component of a bearing sleeve (4) arranged in the guide extension (3) of the drive member.
EP84103852A 1983-09-29 1984-04-06 Guide of the piston of a hand-held air cushion percussion drill Expired EP0135654B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3335305 1983-09-29
DE3335305A DE3335305C1 (en) 1983-09-29 1983-09-29 Hand-held hammer drill

Publications (2)

Publication Number Publication Date
EP0135654A1 EP0135654A1 (en) 1985-04-03
EP0135654B1 true EP0135654B1 (en) 1987-07-01

Family

ID=6210414

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84103852A Expired EP0135654B1 (en) 1983-09-29 1984-04-06 Guide of the piston of a hand-held air cushion percussion drill

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EP (1) EP0135654B1 (en)
DE (2) DE3335305C1 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3438208A1 (en) * 1984-10-18 1986-04-24 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt HAND-DRIVEN HAMMER DRILLING MACHINE WITH DRIVE LINK SAFE
DE3523100A1 (en) * 1985-06-28 1987-01-08 Metabowerke Kg Hammer drill
DE502007003926D1 (en) * 2007-01-25 2010-07-08 Metabowerke Gmbh Striking mechanism for a drill or chisel hammer; Drill or chisel hammer

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3650336A (en) * 1970-05-05 1972-03-21 Rockwell Mfg Co Power driven device
DE2738057A1 (en) * 1977-06-29 1979-02-15 Bosch Gmbh Robert CRAFT MACHINE
DE3039669A1 (en) * 1980-10-21 1982-05-27 Robert Bosch Gmbh, 7000 Stuttgart DRILLING HAMMER

Also Published As

Publication number Publication date
EP0135654A1 (en) 1985-04-03
DE3335305C1 (en) 1984-08-16
DE3464468D1 (en) 1987-08-06

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