EP0755753A1 - Screw fastening device - Google Patents

Screw fastening device Download PDF

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Publication number
EP0755753A1
EP0755753A1 EP96810344A EP96810344A EP0755753A1 EP 0755753 A1 EP0755753 A1 EP 0755753A1 EP 96810344 A EP96810344 A EP 96810344A EP 96810344 A EP96810344 A EP 96810344A EP 0755753 A1 EP0755753 A1 EP 0755753A1
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EP
European Patent Office
Prior art keywords
spindle
spring
drive pinion
stop
radially
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
EP96810344A
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German (de)
French (fr)
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EP0755753B1 (en
Inventor
Anton Neumaier
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Hilti AG
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Hilti AG
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Publication date
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Publication of EP0755753A1 publication Critical patent/EP0755753A1/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
    • B25B23/00—Details of, or accessories for, spanners, wrenches, screwdrivers
    • B25B23/0064—Means for adjusting screwing depth
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
    • B25B23/00—Details of, or accessories for, spanners, wrenches, screwdrivers
    • B25B23/14—Arrangement of torque limiters or torque indicators in wrenches or screwdrivers
    • B25B23/141—Mechanical overload release couplings

Definitions

  • the invention relates to a handheld device, such as a screwdriver; with a housing, a motor arranged in the housing, an axially fixed drive pinion driven by the motor, a spindle mounted in the housing and axially displaceable against the force of a spring relative to the drive pinion, and a coupling element between the drive pinion and the spindle.
  • a screwdriver with a clutch which has a first coupling part driven by a motor, an axially displaceable second coupling part which is rotatably mounted in the housing of the screwdriver and a circumferentially limited rotatable and axially against the force of a spring has displaceable third coupling part.
  • the first coupling part is formed by a drive pinion with cam bodies protruding in the setting direction.
  • the second coupling part is formed by a spindle with cam bodies protruding counter to the setting direction and the third coupling part is formed by a coupling element which is provided with cam bodies on both end faces.
  • the spindle When the screwing device is pressed on, the spindle is axially offset against the force of the spring with the interposition of the coupling element, so that all cam bodies engage in a form-fitting manner.
  • the coupling element When a torque is transmitted from the drive pinion to the spindle, the coupling element is rotated relative to the spindle and axially offset. This position of the coupling element with respect to the spindle is maintained until the spindle is displaced in the setting direction after a screwing-in process has taken place until the positive connection between the cam bodies of the drive pinion and the coupling element is canceled.
  • the invention has for its object to provide a coupling for a hand-held device that is economical to manufacture and is characterized by a low weight and low wear.
  • the object is achieved in that the coupling element is radially displaceable in a radially extending passage opening of the drive pinion by means of an actuating element and cooperates in the radially inserted position with at least one stop surface of the spindle and that the spindle has stops for axially displacing the actuating element.
  • the coupling according to the invention can be produced economically, since all of the individual parts are simple in their construction, are light in weight and therefore have a positive effect on the total weight of the hand-held device.
  • the stops arranged on the spindle enable the actuating element to be displaced.
  • the coupling element is advantageously a ball.
  • the inventive design of the coupling element as a ball enables economical production of the hand-held device, since the ball is a commercially available item that can be bought in, the ball being guided in the passage opening of the drive pinion and the stop surface interacting with the ball directly on the spindle and the drive pinion can be attached.
  • Another advantage is the small size of the coupling element and its low weight, which has a positive effect on the total weight of the hand-held device.
  • the stop pointing in the setting direction is preferably a spring element, the spring force of which corresponds at most to the spring force of the spring.
  • This offers a simple construction by placing the actuating sleeve axially in front of the coupling element in the setting direction is arranged so that overcoming the spring force of the spring element, the coupling element is inserted and automatically disengaged when relaxed.
  • An axial fixing of the actuating element with respect to the drive pinion is expediently achieved by a stop pointing counter to the setting direction, which is formed by a latching element.
  • a holding element cooperating with the spindle is preferably provided for holding the latching element in its latched position.
  • An automatic, axial fixing of the actuating element on the drive pinion is achieved in that the holding element is advantageously acted upon by the spring element.
  • the spindle is supported on the spring element and sets this under preload when it is axially displaced.
  • a simple, axial fixing of the actuating element on the drive pinion is preferably achieved with a latching element which is formed by a radially displaceable latching ball which interacts with a shoulder of the actuating sleeve.
  • the holding element advantageously interacts with an unlocking element arranged on the spindle. In this way, a displacement of the holding element and an unlocking of the latching element is achieved when the spindle moves in relation to the housing or relative to the depth stop in the setting direction.
  • a housing 1 has a housing 1, a handle 16 with an actuating switch 17 for an electric motor 2, an adjustable depth stop 18 and a spindle 5 which can be axially displaced against the force of a spring 4.
  • FIGS. 2 to 4 show, in the housing 1 there is a motor 2, a drive pinion 3 driven by the motor 2, a coupling element 6 in the form of a ball, an actuating element 8, a latching element 15 in the form of a ball, and a holding element 14 with a stop 11, a spring element 12 between the holding element 14 and the actuating element 8, a spring plate 19, a spring 4 between the spring plate 19 and the drive pinion 3, an axially displaceable spindle 5 and a counter to the setting direction, with the spindle 5 in connection standing stop 10 arranged.
  • the drive pinion 3 is axially fixed and freely rotatable on the spindle 5.
  • a collar 20 of the drive pinion 3 which projects in the setting direction and surrounds the spindle 5 has a first passage opening 7 and a second passage opening 21.
  • the coupling element 6 in the form of a ball is arranged and can be radially displaced by means of the actuating element 8.
  • the coupling element 6 can be connected to a stop surface 9 in the form of a longitudinal groove 22 of the spindle 5 which extends in the longitudinal direction of the spindle 5. In this way, a rotationally fixed connection between the spindle 5 and the drive pinion 3 is achieved.
  • the actuating element 8 surrounds the collar 20 of the drive pinion 3 and is telescopically displaceable relative to the latter.
  • a shoulder 13 is arranged in the form of a circumferential recess, which can be connected to the locking element in the form of a locking ball 15.
  • the spherical locking element is arranged in the second passage opening 21 of the collar 20 of the drive pinion 3 and can be displaced radially by means of a holding element 14.
  • the wall thickness of the collar 20 tapers towards the outer contour of the collar 20.
  • the spring plate 19 partially surrounds the actuating element 8 and can be displaced telescopically relative to it.
  • the spring 4 arranged between the spring plate 19 and the drive pinion 3 surrounds the actuating element 8, which is designed in the form of a sleeve with a bottom that is partially closed on one side.
  • the spindle 5 has a circumferential recess 24 which serves to receive an unlocking element 25 in the form of an O-ring.
  • the end face of the spindle 5 on the setting direction can be connected to a bit.
  • the spindle 5 is axially displaced together with the spring plate 19 and the actuating element 8 against the spring 4.
  • the screw, the background and the bit are not shown.
  • the coupling element 6 designed as a ball is displaced radially by the actuating element 8 so that it dips into the longitudinal groove 22 arranged on the spindle 5. In this way, the spindle 5 and the drive pinion 3 are rotationally connected to one another.
  • the annular holding element 14 is also moved until it rests on the latching ball 15, which is captively arranged in a second passage opening 21 of the collar 20 projecting from the drive pinion 3 in the setting direction.
  • a radial force component is applied to the detent ball 15 by the oblique edge 23 of the holding element 14.
  • the shoulder 13 arranged on the inner contour of the actuating element 8 comes to lie in the form of a circumferential groove above the detent ball 15 and the spring element 12 can hold the holding element 14 further to the right and thus the detent ball 15 Press radially outwards into the groove.
  • the actuating element 8 is locked against the drive pinion 3.
  • the depth stop 18 comes into contact with the base and is supported on it.
  • the spindle 5 continues to rotate and moves in the setting direction by the force of the spring 4.
  • the spring plate 19 is also displaced in the setting direction.
  • the unlocking element 25 is displaced in the form of an O-ring in the setting direction against the holding element 14, so that it moves in the setting direction and releases the locking ball 15.
  • the unlocking element 25 is seated in a circumferential recess 24 in the spindle 5.
  • the spring element 12 then shifts the actuating element 8 in the setting direction.
  • the ball 6, which connects the drive pinion 3 and the spindle 5 in a rotationally fixed manner is displaced radially, so that the rotationally fixed connection is released.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Details Of Spanners, Wrenches, And Screw Drivers And Accessories (AREA)

Abstract

The screw driver has a motor in a housing (1) driving an axially fixed drive pinion (3) of a spring-biased spindle (5). A coupling element (6) such as a ball between pinion and spindle is radially displaceable in a radially aligned through opening (7) of the pinion by means of an operating element (8). In the radially inserted position the coupling element interacts with at least one stop face (9) of the spindle (5) which has stops (10,11) for the axial displacement of the operating element. The spindle has two axially spaced stops with the stop pointing in the setting direction formed by a spring element (12) whose spring force corresponds maximum to spring force of the spring (4). The other stop is formed by a detent element.

Description

Die Erfindung betrifft ein Handgerät, wie Schraubgerät; mit einem Gehäuse, einem im Gehäuse angeordneten Motor, einem vom Motor angetriebenen, axial festen Antriebsritzel einer im Gehäuse gelagerten, gegen die Kraft einer Feder gegenüber dem Antriebsritzel axial versetzbaren Spindel und einem Kupplungselement zwischen dem Antriebsritzel und der Spindel.The invention relates to a handheld device, such as a screwdriver; with a housing, a motor arranged in the housing, an axially fixed drive pinion driven by the motor, a spindle mounted in the housing and axially displaceable against the force of a spring relative to the drive pinion, and a coupling element between the drive pinion and the spindle.

Zum oberflächenbündigen Eindrehen von Schrauben werden elektrisch betriebene Schraubgeräte mit einer Trennkupplung verwendet, die zwischen einer Spindel und einem Antriebsritzel angeordnet ist. Die Trennkupplung ermöglicht nach dem Erreichen der gewünschten Eindrehtiefe ein automatisches, geräusch- und verschleissfreies Abkuppeln der Spindel vom Antriebsritzel.Electrically operated screwdrivers with a separating coupling, which is arranged between a spindle and a drive pinion, are used for screwing in screws flush with the surface. The separating clutch enables the spindle to be uncoupled automatically, noise and wear-free from the drive pinion once the desired screw-in depth has been reached.

Aus der EU-PS 0 195 853 ist ein Schraubgerät mit einer Kupplung bekannt, die ein von einem Motor angetriebenes erstes Kupplungsteil, ein im Gehäuse des Schraubgerätes drehbar gelagertes, axial versetzbares zweites Kupplungsteil und ein in Umfangsrichtung begrenzt verdrehbares und axial gegen die Kraft einer Feder versetzbares drittes Kupplungsteil aufweist. Das erste Kupplungsteil wird gebildet von einem Antriebsritzel mit in Setzrichtung vorstehenden Nockenkörpem. Das zweite Kupplungsteil wird gebildet von einer Spindel mit entgegen der Setzrichtung vorstehenden Nockenkörpem und das dritte Kupplungsteil wird gebildet von einem Kupplungselement, das auf beiden Stimseiten mit Nockenkörpem versehen ist.From EU-PS 0 195 853 a screwdriver with a clutch is known which has a first coupling part driven by a motor, an axially displaceable second coupling part which is rotatably mounted in the housing of the screwdriver and a circumferentially limited rotatable and axially against the force of a spring has displaceable third coupling part. The first coupling part is formed by a drive pinion with cam bodies protruding in the setting direction. The second coupling part is formed by a spindle with cam bodies protruding counter to the setting direction and the third coupling part is formed by a coupling element which is provided with cam bodies on both end faces.

Beim Andrücken des Schraubgerätes wird die Spindel unter Zwischenlage des Kupplungselementes gegen die Kraft der Feder axial versetzt, so dass alle Nockenkörper formschlüssig ineinandergreifen. Beim Übertragen eines Drehmomentes von dem Antriebsritzel auf die Spindel, wird das Kupplungselement gegenüber der Spindel verdreht und axial versetzt. Diese Lage des Kupplungselementes gegenüber der Spindel bleibt erhalten, bis die Spindel nach einem erfolgten Eindrehvorgang in Setzrichtung verschoben wird, bis die formschlüssige Verbindung zwischen den Nockenkörpem des Antriebsritzels und des Kupplungselementes aufgehoben wird.When the screwing device is pressed on, the spindle is axially offset against the force of the spring with the interposition of the coupling element, so that all cam bodies engage in a form-fitting manner. When a torque is transmitted from the drive pinion to the spindle, the coupling element is rotated relative to the spindle and axially offset. This position of the coupling element with respect to the spindle is maintained until the spindle is displaced in the setting direction after a screwing-in process has taken place until the positive connection between the cam bodies of the drive pinion and the coupling element is canceled.

Diese bekannte Kupplung ist nur mit grossem Aufwand herstellbar, wobei auch die grossen Nockenkörper, sowie das hohe Eigengewicht sich negativ auf das Gesamtgewicht des Schraubgerätes auswirken, so dass sich frühe Ermüdungserscheinungen beim Arbeiten mit diesem Schraubgerät einstellen. Ausserdem unterliegt dieses bekannte Gerät einem grossen Verschleiss.This known coupling can only be produced with great effort, the large cam bodies and the high dead weight also having a negative effect on the overall weight of the screwing device, so that early signs of fatigue occur when working with this screwing device. In addition, this known device is subject to great wear.

Der Erfindung liegt die Aufgabe zugrunde, eine Kupplung für ein Handgerät zu schaffen, die wirtschaftlich herstellbar ist und sich durch ein geringes Gewicht sowie einen geringen Verschleiss auszeichnet.The invention has for its object to provide a coupling for a hand-held device that is economical to manufacture and is characterized by a low weight and low wear.

Erfindungsgemäss wird die Aufgabe gelöst, indem das Kupplungselement in einer radial verlaufenden Durchtrittsöffnung des Antriebsritzels mittels eines Betätigungselementes radial verschiebbar ist und in radial eingeschobener Stellung mit wenigstens einer Anschlagfläche der Spindel zusammenwirkt und dass die Spindel zur axialen Verschiebung des Betätigungelementes Anschläge aufweist.According to the invention, the object is achieved in that the coupling element is radially displaceable in a radially extending passage opening of the drive pinion by means of an actuating element and cooperates in the radially inserted position with at least one stop surface of the spindle and that the spindle has stops for axially displacing the actuating element.

Die erfindungsgemässe Kupplung ist wirtschaftlich herstellbar, da sämtliche Einzelteile einfach sind in ihrem Aufbau, ein geringes Gewicht aufweisen, und sich dadurch positiv auf das Gesamtgewicht des Handgerätes auswirken. Die auf der Spindel angeordneten Anschläge ermöglichen eine Verschiebung des Betätigungselementes.The coupling according to the invention can be produced economically, since all of the individual parts are simple in their construction, are light in weight and therefore have a positive effect on the total weight of the hand-held device. The stops arranged on the spindle enable the actuating element to be displaced.

Vorteilhafterweise ist das Kupplungselement eine Kugel. Die erfindungsgemässe Ausgestaltung des Kupplungselementes als Kugel ermöglicht eine wirtschaftliche Herstellung des Handgerätes, da es sich bei der Kugel um einen handelsüblichen Artikel handelt, der zugekauft werden kann, wobei die Kugel in der Durchtrittsöffnung des Antriebsritzels geführt ist und die mit der Kugel zusammenwirkende Anschlagfläche direkt an der Spindel und dem Antriebsritzel angebracht werden kann. Ein weiterer Vorteil ist die geringe Baugrösse des Kupplungselementes und dessen geringes Gewicht, das sich auf das Gesamtgewicht des Handgerätes positiv auswirkt.The coupling element is advantageously a ball. The inventive design of the coupling element as a ball enables economical production of the hand-held device, since the ball is a commercially available item that can be bought in, the ball being guided in the passage opening of the drive pinion and the stop surface interacting with the ball directly on the spindle and the drive pinion can be attached. Another advantage is the small size of the coupling element and its low weight, which has a positive effect on the total weight of the hand-held device.

Vorzugsweise ist der in Setzrichtung weisende Anschlag ein Federelement, dessen Federkraft höchstens der Federkraft der Feder entspricht. Damit bietet sich eine einfache Bauweise indem die Betätigungshülse in Setzrichtung axial vor dem Kupplungselement angeordnet ist, so dass unter Überwindung der Federkraft des Federelementes das Kupplungselement eingeschoben und bei Entspannung automatisch ausgerückt wird.The stop pointing in the setting direction is preferably a spring element, the spring force of which corresponds at most to the spring force of the spring. This offers a simple construction by placing the actuating sleeve axially in front of the coupling element in the setting direction is arranged so that overcoming the spring force of the spring element, the coupling element is inserted and automatically disengaged when relaxed.

Eine axiale Festlegung des Betätigungselementes gegenüber dem Antriebsritzel wird zweckrnässigerweise von einem entgegen der Setzrichtung weisenden Anschlag erreicht, der von einem Rastelement gebildet wird.An axial fixing of the actuating element with respect to the drive pinion is expediently achieved by a stop pointing counter to the setting direction, which is formed by a latching element.

Damit eine axiale Festlegung des Betätigungselementes gegenüber dem Antriebsritzel erreicht werden kann, ist vozugsweise ein mit der Spindel zusammenwirkendes Halteelement zur Halterung des Rastelementes in dessen verrasteter Stellung vorgesehen.So that an axial fixing of the actuating element with respect to the drive pinion can be achieved, a holding element cooperating with the spindle is preferably provided for holding the latching element in its latched position.

Eine automatische, axiale Festlegung des Betätigungselementes an dem Antriebsritzel wird erreicht, indem vorteilhafterweise das Halteelement vom Federelement beaufschlagt ist. Zu diesem Zweck stützt sich die Spindel am Federelement ab und setzt dies bei deren Axialverschiebung unter Vorspannung.An automatic, axial fixing of the actuating element on the drive pinion is achieved in that the holding element is advantageously acted upon by the spring element. For this purpose, the spindle is supported on the spring element and sets this under preload when it is axially displaced.

Eine einfache, axiale Festlegung des Betätigungselementes an dem Antriebsritzel wird vorzugsweise mit einem Rastelement erreicht, das von einer radial verschiebbaren, mit einer Schulter der Betätigungshülse zusammenwirkenden Rastkugel gebildet wird.A simple, axial fixing of the actuating element on the drive pinion is preferably achieved with a latching element which is formed by a radially displaceable latching ball which interacts with a shoulder of the actuating sleeve.

Vorteilhafterweise wirkt das Halteelement mit einem auf der Spindel angeordneten Entriegelungselement zusammen. Auf diese Weise wird eine Versetzung des Halteelementes und eine Entriegelung des Rastelementes erreicht, wenn sich die Spindel gegenüber dem Gehäuse bzw. gegenüber dem Tiefenanschlag in Setzrichtung verschiebt.The holding element advantageously interacts with an unlocking element arranged on the spindle. In this way, a displacement of the holding element and an unlocking of the latching element is achieved when the spindle moves in relation to the housing or relative to the depth stop in the setting direction.

Die Erfindung wird anhand von Zeichnungen, die ein Ausführungsbeispiel wiedergeben, näher erläutert. Es zeigen:

Fig. 1
ein erfindungsgemässes, schematisch dargestelltes Handgerät,
Fig. 2
ein Teil des Handgerätes gemäss Fig.1, in vergrösserter und geschnittener Darstellung, voll ausgekuppelt,
Fig. 3
ein Teil des Handgerätes gemäss Fig. 1, in vergrösserter und geschnittener Darstellung, voll eingekuppelt,
Fig. 4
ein Teil des Handgerätes gemäss Fig. 1, in vergrösserter und geschnittener Darstellung, kurz vor dem Auskuppeln.
The invention is explained in more detail with reference to drawings which show an exemplary embodiment. Show it:
Fig. 1
an inventive, schematically illustrated handheld device,
Fig. 2
part of the hand-held device according to FIG. 1, in an enlarged and sectional view, fully disengaged,
Fig. 3
part of the hand-held device according to FIG. 1, in an enlarged and sectional representation, fully coupled,
Fig. 4
a part of the handheld device according to FIG. 1, in an enlarged and sectional view, shortly before disengaging.

Das in Fig. 1 dargestellte Schraubgerät weist ein Gehäuse 1, einen Handgriff 16 mit Betätigungsschaiter 17 für einen elektrischen Motor 2, einen verstellbaren Tiefenanschlag 18 und eine gegen die Kraft einer Feder 4 axial versetzbare Spindel 5 auf.1 has a housing 1, a handle 16 with an actuating switch 17 for an electric motor 2, an adjustable depth stop 18 and a spindle 5 which can be axially displaced against the force of a spring 4.

Wie die Fig. 2 bis 4 zeigen, ist in dem Gehäuse 1 ein Motor 2, ein vom Motor 2 angetriebenes Antriebsritzel 3, ein Kupplungselement 6 in Form einer Kugel, ein Betätigungselement 8, ein Rastelement 15 in Form einer Kugel, ein Halteelement 14 mit einem Anschlag 11, ein Federelement 12 zwischen dem Halteelement 14 und dem Betätigungselement 8, ein Federteller 19, eine Feder 4 zwischen dem Federteller 19 und dem Antriebsritzel 3,eine axial versetzbare Spindel 5 und ein entgegen der Setzrichtung weisender, mit der Spindel 5 in Verbindung stehender Anschlag 10 angeordnet.2 to 4 show, in the housing 1 there is a motor 2, a drive pinion 3 driven by the motor 2, a coupling element 6 in the form of a ball, an actuating element 8, a latching element 15 in the form of a ball, and a holding element 14 with a stop 11, a spring element 12 between the holding element 14 and the actuating element 8, a spring plate 19, a spring 4 between the spring plate 19 and the drive pinion 3, an axially displaceable spindle 5 and a counter to the setting direction, with the spindle 5 in connection standing stop 10 arranged.

Das Antriebsritzel 3 ist axial fest angeordnet und frei drehbar auf der Spindel 5 angeordnet. Ein in Setzrichtung abragender, die Spindel 5 umgebender Bund 20 des Antriebsritzels 3 weist eine erste Durchtrittsöffnung 7 und eine zweite Durchtrittöffnung 21 auf. In der, dem verzahnten Bereich des Antriebsritzels 3 näher liegenden, ersten Durchtrittsöffnung 7 ist das in Form einer Kugel ausgebildete Kupplungselement 6 angeordnet, und mittels des Betätigungselementes 8 radial versetzbar. Das Kupplungselement 6 ist mit einer Anschlagfläche 9 in Form einer sich in Längsrichtung der Spindel 5 erstreckenden Längsnut 22 der Spindel 5 in Verbindung bringbar. Auf diese Weise wird eine drehfeste Verbindung zwischen der Spindel 5 und dem Antriebsritzel 3 erreicht.The drive pinion 3 is axially fixed and freely rotatable on the spindle 5. A collar 20 of the drive pinion 3 which projects in the setting direction and surrounds the spindle 5 has a first passage opening 7 and a second passage opening 21. In the first passage opening 7, which is closer to the toothed region of the drive pinion 3, the coupling element 6 in the form of a ball is arranged and can be radially displaced by means of the actuating element 8. The coupling element 6 can be connected to a stop surface 9 in the form of a longitudinal groove 22 of the spindle 5 which extends in the longitudinal direction of the spindle 5. In this way, a rotationally fixed connection between the spindle 5 and the drive pinion 3 is achieved.

Das Betätigungselement 8 umgibt den Bund 20 des Antriebsritzels 3 und ist gegenüber diesem teleskopartig versetzbar. An der Innenkontur des Betatigungselementes 8 ist eine Schulter 13 in Form einer umlaufend ausgebildeten Vertiefung angeordnet, die mit dem Rastelement in Form einer Rastkugel 15 in Verbindung gebracht werden kann. Das kugelförmige Rastelement ist in der zweiten Durchtrittsöffnung 21 des Bundes 20 des Antriebsritzels 3 angeordnet und mittels eines Halteelementes 14 radlal versetzbar.The actuating element 8 surrounds the collar 20 of the drive pinion 3 and is telescopically displaceable relative to the latter. On the inner contour of the actuating element 8, a shoulder 13 is arranged in the form of a circumferential recess, which can be connected to the locking element in the form of a locking ball 15. The spherical locking element is arranged in the second passage opening 21 of the collar 20 of the drive pinion 3 and can be displaced radially by means of a holding element 14.

Im Bereich der zweiten Durchtrittsöffnung 21 verjüngt sich die Wandstärke des Bundes 20 zur Aussenkontur des Bundes 20 hin konisch. Das, die Spindel 5 umgebende, gegenüber der Spindel 5 axial versetzbare Halteelement 14 ist ringförmig ausgebildet und weist eine schräge Kante 23 auf, die mit der konischen Verjüngung des Bundes 20 derart zusammen wirkt, dass beim axialen Versetzen des Haltelementes 14 gegenüber dem Bund 20 die Rastkugel 15 radial versetzt wird.In the area of the second passage opening 21, the wall thickness of the collar 20 tapers towards the outer contour of the collar 20. The holding element 14, which surrounds the spindle 5 and is axially displaceable relative to the spindle 5, is annular and has one inclined edge 23, which interacts with the conical taper of the collar 20 such that when the holding element 14 is axially displaced relative to the collar 20, the detent ball 15 is radially displaced.

Der Federteller 19 umgibt das Betätigungselement 8 teilweise und ist gegenüber diesem teleskopartig versetzbar. Die zwischen dem Federteller 19 und dem Antriebsritzel 3 angeordnete Feder 4 umgibt das Betätigungselement 8 das in Form einer Hülse mit einem einseitig teilweise geschlossenen Boden ausgebildet ist.The spring plate 19 partially surrounds the actuating element 8 and can be displaced telescopically relative to it. The spring 4 arranged between the spring plate 19 and the drive pinion 3 surrounds the actuating element 8, which is designed in the form of a sleeve with a bottom that is partially closed on one side.

Zwischen der als Längsnut 22 ausgebildeten Anschlagfläche 9 der Spindel 5 und dem entgegen der Setzrichtung weisenden Anschlag 10 weist die Spindel 5 eine umlaufend ausgebildete Vertiefung 24 auf, die der Aufnahme eines Entriegelungselementes 25 in Form eines O-Ringes dient.Between the stop surface 9 of the spindle 5, which is designed as a longitudinal groove 22, and the stop 10 pointing in the opposite direction to the setting direction, the spindle 5 has a circumferential recess 24 which serves to receive an unlocking element 25 in the form of an O-ring.

Im folgenden wird der Eindrehvorgang einer Schraube in einen Untergrund mit dem erfindungsgemässen Schraubgerät beschrieben.The process of screwing a screw into a subsurface using the screwing device according to the invention is described below.

Zum Eindrehen einer Schraube ist die setzrichtungsseitige Stimseite der Spindel 5 mit einem Bit in Verbindung bringbar. Durch Andrücken des Schraubgerätes auf den Untergrund, wird die Spindel 5 zusammen mit dem Federteller 19 und dem Betätigungselement 8 gegen die Feder 4 axial verschoben. Die Schraube, der Untergrund und der Bit sind nicht dargestellt. Das als Kugel ausgebildete Kupplungselement 6 wird dabei vom Betätigungselement 8 radial versetzt, so dass dieses in die an der Spindel 5 angeordnete Längsnut 22 eintaucht. Auf diese Weise sind die Spindel 5 und das Antriebsritzel 3 drehschlüssig miteinander verbunden.To screw in a screw, the end face of the spindle 5 on the setting direction can be connected to a bit. By pressing the screwdriver onto the surface, the spindle 5 is axially displaced together with the spring plate 19 and the actuating element 8 against the spring 4. The screw, the background and the bit are not shown. The coupling element 6 designed as a ball is displaced radially by the actuating element 8 so that it dips into the longitudinal groove 22 arranged on the spindle 5. In this way, the spindle 5 and the drive pinion 3 are rotationally connected to one another.

Beim axialen Verschieben der Spindel 5 wird femer das ringförmige Halteelement 14 mitbewegt bis es an der Rastkugel 15 anliegt, welches unverlierbar in einer zweiten Durchtrittsöffnung 21 des in Setzrichtung vom Antriebsritzel 3 abragenden Bundes 20 angeordnet ist. Durch die schräge Kante 23 des Halteelementes 14 wird die Rastkugel 15 mit einer radialen Kraftkomponente beaufschlagt. Sobald die axiale Bewegung des Betätigungselementes 8 die Endstellung erreicht hat, kommt die auf der Innenkontur des Betätigungselementes 8 angeordnete Schulter 13 in Form einer umlaufend ausgebildeten Nut über der Rastkugel 15 zu liegen und das Federelement 12 kann das Haltelement 14 weiter nach rechts und damit die Rastkugel 15 radial nach aussen in die Nut drücken. Damit ist das Betätigungselement 8 selbsthaltend gegenüber dem Antriebsritzel 3 verriegelt.When the spindle 5 is axially displaced, the annular holding element 14 is also moved until it rests on the latching ball 15, which is captively arranged in a second passage opening 21 of the collar 20 projecting from the drive pinion 3 in the setting direction. A radial force component is applied to the detent ball 15 by the oblique edge 23 of the holding element 14. As soon as the axial movement of the actuating element 8 has reached the end position, the shoulder 13 arranged on the inner contour of the actuating element 8 comes to lie in the form of a circumferential groove above the detent ball 15 and the spring element 12 can hold the holding element 14 further to the right and thus the detent ball 15 Press radially outwards into the groove. Thus, the actuating element 8 is locked against the drive pinion 3.

Kurz bevor die Schraube die gewünschte Eindrehtiefe erreicht, kommt der Tiefenanschlag 18 mit dem Untergrund in Berührung und stützt sich an diesem ab. Die Spindel 5 dreht sich weiter und bewegt sich durch die Kraft der Feder 4 in Setzrichtung. Dabei erfolgt auch eine Versetzung des Federtellers 19 in Setzrichtung.Shortly before the screw reaches the desired screwing depth, the depth stop 18 comes into contact with the base and is supported on it. The spindle 5 continues to rotate and moves in the setting direction by the force of the spring 4. The spring plate 19 is also displaced in the setting direction.

Sobald die Spindel 5 jene Lage erreicht hat, bei der die gewünschte Eindrehtiefe der Schraube erreicht ist, wird das Entriegelungselement 25 in Form eines O-Ringes in Setzrichtung gegen das Halteelement 14 verschoben, so dass sich dieses in Setzrichtung bewegt und die Rastkugel 15 freigibt. Das Entriegelungselement 25 sitzt in einer umlaufend ausgebildeten Vertiefung 24 der Spindel 5. Das Federelement 12 verschiebt anschliessend das Betätigungselement 8 in Setzrichtung. Dadurch wird die Kugel 6, die das Antriebsritzel 3 und die Spindel 5 drehfest verbindet, radial versetzt, so dass die drehfeste Verbindung aufgehoben wird.As soon as the spindle 5 has reached the position at which the desired screwing depth of the screw has been reached, the unlocking element 25 is displaced in the form of an O-ring in the setting direction against the holding element 14, so that it moves in the setting direction and releases the locking ball 15. The unlocking element 25 is seated in a circumferential recess 24 in the spindle 5. The spring element 12 then shifts the actuating element 8 in the setting direction. As a result, the ball 6, which connects the drive pinion 3 and the spindle 5 in a rotationally fixed manner, is displaced radially, so that the rotationally fixed connection is released.

Claims (9)

Handgerät, wie Schraubgerät, mit einem Gehäuse (1), einem im Gehäuse (1) angeordneten Motor (2), einem vom Motor (2) angetriebenen, axial festen Antriebsritzel (3) einer im Gehäuse (1) gelagerten, gegen die Kraft einer Feder (4) gegenüber dem Antriebsritzel (3) axial versetzbaren Spindel (5) und einem Kupplungselement (6) zwischen dem Antriebsritzel (3) und der Spindel (5), dadurch gekennzeichnet, dass das Kupplungselement (6) in einer radial verlaufenden Durchtrittsöffnung (7) des Antriebsritzels (3) mittels eines Betätigungselementes (8) radial verschiebbar ist und in radial eingeschobener Stellung mit wenigstens einer Anschlagfläche (9) der Spindel (5) zusammenwirkt und dass die Spindel (5) zur axialen Verschiebung des Betätigungselementes (8) Anschläge (10, 11) aufweist.Handheld device, such as a screwdriver, with a housing (1), a motor (2) arranged in the housing (1), an axially fixed drive pinion (3) driven by the motor (2), one in the housing (1), against the force of a Spring (4) with respect to the drive pinion (3) axially displaceable spindle (5) and a coupling element (6) between the drive pinion (3) and the spindle (5), characterized in that the coupling element (6) in a radially extending passage opening ( 7) of the drive pinion (3) is radially displaceable by means of an actuating element (8) and cooperates in the radially inserted position with at least one stop surface (9) of the spindle (5) and that the spindle (5) for the axial displacement of the actuating element (8) stops (10, 11). Gerät nach Anspruch 1, dadurch gekennzeichnet, dass das Kupplungselement (6) eine Kugel ist.Device according to claim 1, characterized in that the coupling element (6) is a ball. Gerät nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass die Spindel (5) zwei in axialem Abstand voneinander angeordnete Anschläge (10, 11) aufweist.Device according to claim 1 or 2, characterized in that the spindle (5) has two stops (10, 11) arranged at an axial distance from one another. Gerät nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass der in Setzrichtung weisende Anschlag (11) von einem Federelement (12) gebildet wird, dessen Federkraft höchstens der Federkraft der Feder (4) entsprichtDevice according to one of claims 1 to 3, characterized in that the stop (11) pointing in the setting direction is formed by a spring element (12), the spring force of which corresponds at most to the spring force of the spring (4) Gerät nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, dass der entgegen der Setzrichtung weisende Anschlag (10) von einem Rastelement gebildet wird.Device according to one of claims 1 to 4, characterized in that the stop (10) pointing against the setting direction is formed by a latching element. Gerät nach Anspruch 5, dadurch gekennzeichnet, dass ein mit der Spindel (5) zusammenwirkendes Halteelement (14) zur Halterung des Rastelementes in dessen verrasteter Stellung vorgesehen ist.Apparatus according to claim 5, characterized in that a holding element (14) cooperating with the spindle (5) is provided for holding the locking element in its locked position. Gerät nach Anspruch 6, dadurch gekennzeichnet, dass das Halteelement (14) vom Federelement (12) beaufschlagt ist.Apparatus according to claim 6, characterized in that the holding element (14) is acted upon by the spring element (12). Gerät nach Anspruch 5 oder 6, dadurch gekennzeichnet, dass das Rastelement von einer radial verschiebbaren, mit einer Schulter (13) des Betätigungselementes (8) zusammenwirkenden Rastkugel (15) gebildet wird.Apparatus according to claim 5 or 6, characterized in that the latching element is formed by a radially displaceable latching ball (15) which interacts with a shoulder (13) of the actuating element (8). Gerät nach einem der Ansprüche 6 bis 8, dadurch gekennzeichnet, dass das Halteelement (14) mit einem auf der Spindel (5) angeordneten Entriegelungselement (25) zusammenwirkt.Device according to one of claims 6 to 8, characterized in that the holding element (14) interacts with an unlocking element (25) arranged on the spindle (5).
EP96810344A 1995-07-26 1996-05-29 Screw fastening device Expired - Lifetime EP0755753B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19527192A DE19527192A1 (en) 1995-07-26 1995-07-26 Screwdriver
DE19527192 1995-07-26

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EP0755753A1 true EP0755753A1 (en) 1997-01-29
EP0755753B1 EP0755753B1 (en) 1998-08-12

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JP (1) JPH0938869A (en)
DE (2) DE19527192A1 (en)

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Also Published As

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EP0755753B1 (en) 1998-08-12
JPH0938869A (en) 1997-02-10
US5778989A (en) 1998-07-14
DE59600423D1 (en) 1998-09-17
DE19527192A1 (en) 1997-01-30

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