EP2511048B1 - Screw driver with torque limitation - Google Patents

Screw driver with torque limitation Download PDF

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Publication number
EP2511048B1
EP2511048B1 EP12157844.7A EP12157844A EP2511048B1 EP 2511048 B1 EP2511048 B1 EP 2511048B1 EP 12157844 A EP12157844 A EP 12157844A EP 2511048 B1 EP2511048 B1 EP 2511048B1
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EP
European Patent Office
Prior art keywords
handle
screwdriver
screwdriver according
rotationally fixed
shank
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EP12157844.7A
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German (de)
French (fr)
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EP2511048A1 (en
Inventor
Otmar Karle
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Wiha Werkzeuge GmbH
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Wiha Werkzeuge GmbH
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Publication of EP2511048A1 publication Critical patent/EP2511048A1/en
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Classifications

    • 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
    • B25B23/142—Arrangement of torque limiters or torque indicators in wrenches or screwdrivers specially adapted for hand operated wrenches or screwdrivers
    • B25B23/1422—Arrangement of torque limiters or torque indicators in wrenches or screwdrivers specially adapted for hand operated wrenches or screwdrivers torque indicators or adjustable torque limiters
    • 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
    • B25B15/00—Screwdrivers
    • B25B15/02—Screwdrivers operated by rotating the handle

Definitions

  • the invention relates to a screwdriver with torque limiter according to the preamble of patent claim 1.
  • the torque limiting mechanism When the torque transmitted via the clutch from the handle to the shaft exceeds a limit torque, the torque limiting mechanism disengages and the shaft rotates against the handle by at least a defined angle until the torque limiting mechanism reengages.
  • the torque limiting mechanism is subject to wear.
  • the object of the invention is therefore to develop a generic screwdriver with torque limiter to make the use more comfortable.
  • the screwdriver according to the invention with a torque limiting enclosing handle and with a coaxially inserted into the handle shaft which is rotatably coupled to the handle and torque-coupled thereto via the torque limiter, each relative rotation between the shaft and the handle by at least one defined angle a switching cycle is characterized in that the screwdriver comprises means for counting the switching cycles.
  • the means for counting the switching cycles may preferably be formed as an active or passive component.
  • the means to a Hall sensor and at least one magnetic element wherein preferably the Hall sensor rotatably connected to the handle and the at least one magnetic element rotatably connected to the shaft.
  • the Hall sensor rotatably connected to the handle and the at least one magnetic element rotatably connected to the shaft.
  • a relative rotation between the shaft and the handle thus also takes place a relative rotation between the Hall sensor and the at least one magnetic element, so that the relative rotation can be detected by the Hall sensor.
  • the magnetic element is made of magnetic plastic, which allows a simple and cost-effective production.
  • a disc is coaxially penetrated by the shaft and is rotatably connected thereto, wherein at least one magnetic element is arranged on the disc.
  • at least one magnetic element is arranged on the disc.
  • the means comprise a reed contact and a magnetic element, wherein preferably the magnetic element rotatably connected to the shaft and the reed contact rotatably connected to the handle.
  • the means comprise a cam disc with at least one cam and a button, wherein preferably the cam disc rotatably connected to the shaft and the probe rotatably connected to the handle.
  • an actuator is disposed between the cam and the button, which in particular allows a compact arrangement within the handle.
  • the means include optical, inductive, capacitive or by means of a piezoelectric element, the switching cycles.
  • the torque limiting two by means of engagement elements, preferably by means of ratchet teeth, interlocking coupling elements, wherein the defined angle is defined by the angular distance between two adjacent engagement elements.
  • the number of magnetic elements or the number of cams corresponds to the number of engagement elements or to this in an integer ratio, in order thus to a direct correlation between the relative rotation between the shaft and handle and the counted Number of switching cycles to achieve.
  • FIGS. 1 to 3 a first embodiment of a screwdriver 10 is shown with a handle 20 in which a torque limiting mechanism is integrated and in which a shaft 30 is inserted coaxially.
  • the torque limiting mechanism is not the subject of the invention and can be designed in different designs. It is essential that the shaft 30 is inserted coaxially rotatable in the handle 20 and that the force exerted on the handle 20 torque is transmitted via a coupling 78 of the torque limiting mechanism on the shaft 30.
  • the clutch 78 is acted upon, for example by a helical spring designed as a compression spring 88 which holds the clutch 78 with an axial compressive force in engagement.
  • the clutch 78 has a first coupling element 80 and a second coupling element 84.
  • the first coupling element 80 is rotatably connected to the shaft 30, while the second coupling element 84 is rotatably connected to the handle 20.
  • the two coupling elements 80, 84 may have, for example, a corresponding number of latching teeth 82, 86 which are engaged with each other upon engagement of the coupling 78.
  • the ratchet teeth 82, 86 slide over each other until the clutch 78 is again engaged.
  • ratchet teeth 82, 86 can also be used differently shaped engagement elements, for example based on balls or the like.
  • a rotation between the shaft 30 and the handle 20 is considered by the smallest possible angle of rotation, which is necessary for a lifting out of an engagement position of the clutch 78 until the clutch 78 is engaged again, for example, the angular distance between two adjacent Latching teeth 82 of the first coupling element or two adjacent latching teeth 86 of the second coupling element.
  • the screwdriver 10 has means for counting the switching cycles.
  • the means for counting the switching cycles can be designed as active or passive components.
  • Screwdriver 10 shown have the means an active device in the form of a Hall sensor 40 and a disc 50 with a plurality of magnetic elements 52.
  • the Hall sensor 40 is rotatably connected to the handle 20.
  • the disc 50 is rotatably connected to the shaft 30 and is particularly coaxially penetrated by this.
  • the number of magnetic elements 52 preferably corresponds to the number of engagement elements, in particular the number of ratchet teeth 82, 86 of the clutch 78.
  • the clutch 78 may have a first coupling element 80 with nine ratchet teeth 82 and a second coupling element 84 with nine ratchet teeth 86.
  • nine magnetic elements 52 are likewise arranged on the disk 50 (cf. Fig. 3 ).
  • the magnetic elements are preferably made of magnetic plastic.
  • the magnetic elements 52 can be placed on the disc 50 and secured thereto be.
  • the magnetic elements 52 and the disc 50 are integrally formed and in particular made of magnetic plastic.
  • the Hall sensor 40 is arranged in particular axially parallel to the longitudinal axis of the shaft 30 and can distinguish whether a magnetic element 52 is in its detection range or the gap between two adjacent magnetic elements 52.
  • the Hall sensor 40 is in this case with an evaluation electronics by means of which it can be counted how many times a magnetic element 52 moves past the Hall sensor 40. In this way, the switching cycles of the clutch 78 can be counted.
  • a battery or the like is provided to power the Hall sensor 40 and the evaluation electronics.
  • a display not shown, is arranged, on which with the aid of the evaluation electronics, the number of switching cycles can be displayed. Furthermore, the status of the battery used for the Hall sensor 40 or, if the torque of the torque limiting mechanism of the screwdriver 10 is variable, the set torque can be displayed on such a display. If necessary, appropriate warning signals or warnings can be output when overwriting predetermined limit values for the number of switching cycles or the set torque or shortly before complete emptying of the battery.
  • FIG. 4-9 is another embodiment of a screwdriver 10 'shown. This differs from that in the Figures 1-3 illustrated embodiment of the screwdriver 10 essentially by the design of the means for counting the switching cycles, while the torque limiting mechanism is essentially identical.
  • the screwdriver 10 ' has means for counting the switching cycles, which have a cam disc 70 and a button 60.
  • the cam plate 70 is rotatably connected to the shaft 30, while the button 60 rotatably connected to the handle 20.
  • cams 72 are arranged on the cam plate 70.
  • the number of cams 72 preferably corresponds to the number of engagement elements of the clutch 78.
  • the cam disk 70 has ten cams 72 (cf. Fig. 9 ).
  • an actuating element 75 is arranged substantially parallel to the longitudinal axis of the shaft 30, so that the button 60 can be arranged radially inside the cam plate 70 and axially offset therefrom to achieve a compact design.
  • An evaluation electronics connected to the button 60 counts the actuations of the button 60 and thus the number of switching cycles of the coupling 78. The number of switching cycles or other information relevant to the user can be displayed on a display 90 in the handle 20 of the screwdriver 10.

Description

Die Erfindung betrifft einen Schraubendreher mit Drehmomentbegrenzung gemäß dem Oberbegriff des Patentanspruchs 1.The invention relates to a screwdriver with torque limiter according to the preamble of patent claim 1.

Bekannt sind Schraubendreher mit einem eine Drehmomentbegrenzung einschließenden Handgriff und mit einem in den Handgriff koaxial eingesetzten Schaft, der gegen den Handgriff drehbar und mit diesem über die Drehmomentbegrenzung drehmomentschlüssig gekuppelt ist, wobei jede Relativdrehung zwischen dem Schaft und dem Handgriff um mindestens einen definierten Winkel einen Schaltzyklus darstellt. Schraubendreher mit Drehmomentbegrenzung sind vorteilhaft, um Schrauben mit einer vorgegebenen Kraft festzuziehen, die einerseits einen zuverlässigen Halt der Schraubverbindung gewährleistet und andererseits eine Überbeanspruchung des Gewindes ausschließt. Der Schaft ist daher in dem Handgriff drehbar, um ein Auskuppeln der Drehmomentbegrenzungsmechanik zu ermöglichen. Wenn das über die Kupplung von dem Handgriff auf den Schaft übertragene Drehmoment ein Grenzdrehmoment überschreitet, kommt die Drehmomentbegrenzungsmechanik außer Eingriff und der Schaft dreht gegen den Handgriff um mindestens einen definierten Winkel, bis die Drehmomentbegrenzungsmechanik wieder eingreift. Die Drehmomentbegrenzungsmechanik ist dabei Verschleiß unterworfen.Are known screwdriver with a torque limiting enclosing handle and with a handle inserted coaxially into the shaft, which is rotatably coupled to the handle and torque-locked with this over the torque limiter, each relative rotation between the shaft and the handle by at least one defined angle a switching cycle represents. Torque-limiting screwdrivers are advantageous for tightening screws with a predetermined force, which, on the one hand, ensures reliable holding of the screw connection and, on the other hand, precludes overstressing the thread. The shaft is therefore rotatable in the handle to allow disengagement of the torque limiting mechanism. When the torque transmitted via the clutch from the handle to the shaft exceeds a limit torque, the torque limiting mechanism disengages and the shaft rotates against the handle by at least a defined angle until the torque limiting mechanism reengages. The torque limiting mechanism is subject to wear.

Aus der DE 20 2007 007 759 U1 , der DE 20 2005 013 648 U1 und der EP 1 092 510 A2 sind jeweils Schraubendreher mit einem eine Drehmomentbegrenzung einschließenden Handgriff und mit einem in den Handgriff koaxial eingesetzten Schaft, der gegen den Handgriff drehbar und mit diesem über die Drehmomentbegrenzung drehmomentschlüssig gekuppelt ist, bekannt, bei denen eine Drehmomentüberschreitung zu einer Relativdrehung zwischen dem Schaft und dem Handgriff um mindestens einen definierten Winkel führt.From the DE 20 2007 007 759 U1 , of the DE 20 2005 013 648 U1 and the EP 1 092 510 A2 are each a screwdriver with a torque limiting enclosing handle and with a coaxially inserted into the handle shaft, which is rotatably coupled to the handle and torque-coupled with this torque limiting, known in which a torque exceeded to a relative rotation between the shaft and the handle by at least one defined angle leads.

Aus der US 7,047,849 B2 ist eine Ratsche bekannt, bei welcher bei Überschreitung eines gegebenen Drehmomentes im Inneren eines rohrförmigen, mit einem Handgriff verschraubten Schaftes durch Verschiebung eines Keiles ein Signal erzeugt wird, das von einem Zähler gezählt wird.From the US Pat. No. 7,047,849 B2 a ratchet is known in which when exceeding a given torque inside a tubular, screwed with a handle shank by displacement of a wedge, a signal is generated, which is counted by a counter.

Die Aufgabe der Erfindung besteht daher darin, einen gattungsgemäßen Schraubendreher mit Drehmomentbegrenzung weiterzubilden, um die Benutzung komfortabler zu gestalten.The object of the invention is therefore to develop a generic screwdriver with torque limiter to make the use more comfortable.

Die Aufgabe wird erfindungsgemäß gelöst durch einen Schraubendreher mit den Merkmalen des Patentanspruchs 1.The object is achieved by a screwdriver with the features of claim 1.

Vorteilhafte Ausgestaltungen und Weiterbildungen der Erfindung sind in den abhängigen Ansprüchen angegeben.Advantageous embodiments and further developments of the invention are specified in the dependent claims.

Der erfindungsgemäße Schraubendreher mit einem eine Drehmomentbegrenzung einschließenden Handgriff und mit einem in den Handgriff koaxial eingesetzten Schaft, der gegen den Handgriff drehbar und mit diesem über die Drehmomentbegrenzung drehmomentschlüssig gekuppelt ist, wobei jede Relativdrehung zwischen dem Schaft und dem Handgriff um mindestens einen definierten Winkel einen Schaltzyklus darstellt, zeichnet sich dadurch aus, dass der Schraubendreher Mittel zum Zählen der Schaltzyklen aufweist. Durch die Mittel zum Zählen der Schaltzyklen wird dem Benutzer die Information gegeben, welchem Verschleiß die Drehmomentbegrenzungsmechanik bereits unterworfen ist, sodass der Benutzer erkennen kann, wie stark beansprucht der Schraubendreher ist.The screwdriver according to the invention with a torque limiting enclosing handle and with a coaxially inserted into the handle shaft which is rotatably coupled to the handle and torque-coupled thereto via the torque limiter, each relative rotation between the shaft and the handle by at least one defined angle a switching cycle is characterized in that the screwdriver comprises means for counting the switching cycles. By the means for counting the switching cycles, the user is given the information on which wear the torque limiting mechanism is already subjected, so that the user can see how much stress the screwdriver is.

Die Mittel zum Zählen der Schaltzyklen können vorzugsweise als aktives oder passives Bauelement ausgebildet sein.The means for counting the switching cycles may preferably be formed as an active or passive component.

Gemäß einer besonders bevorzugten Ausführungsform der Erfindung weisen die Mittel einen Hall-Sensor und wenigstens ein magnetisches Element auf, wobei vorzugsweise der Hall-Sensor drehfest mit dem Handgriff und das wenigstens eine magnetische Element drehfest mit dem Schaft verbunden sind. Bei einer Relativdrehung zwischen dem Schaft und dem Handgriff erfolgt somit ebenfalls eine Relativdrehung zwischen dem Hall-Sensor und dem wenigstens einen magnetischen Element, sodass die Relativdrehung durch den Hall-Sensor erfasst werden kann.According to a particularly preferred embodiment of the invention, the means to a Hall sensor and at least one magnetic element, wherein preferably the Hall sensor rotatably connected to the handle and the at least one magnetic element rotatably connected to the shaft. In a relative rotation between the shaft and the handle thus also takes place a relative rotation between the Hall sensor and the at least one magnetic element, so that the relative rotation can be detected by the Hall sensor.

Besonders bevorzugt ist das magnetische Element aus magnetischem Kunststoff gefertigt, was eine einfache und kostengünstige Herstellungsweise ermöglicht.Particularly preferably, the magnetic element is made of magnetic plastic, which allows a simple and cost-effective production.

Vorzugsweise wird eine Scheibe koaxial von dem Schaft durchsetzt und ist mit diesem drehfest verbunden, wobei wenigstens ein magnetisches Element auf der Scheibe angeordnet ist. Auf diese Art und Weise wird in kompakter Bauweise ein Anbringen der magnetischen Elemente an dem Schaft ermöglicht.Preferably, a disc is coaxially penetrated by the shaft and is rotatably connected thereto, wherein at least one magnetic element is arranged on the disc. In this way a mounting of the magnetic elements on the shaft is made possible in a compact design.

Gemäß einer bevorzugten Ausführungsform der Erfindung weisen die Mittel einen Reed-Kontakt und ein magnetisches Element auf, wobei vorzugsweise das magnetische Element drehfest mit dem Schaft und der Reed-Kontakt drehfest mit dem Handgriff verbunden sind.According to a preferred embodiment of the invention, the means comprise a reed contact and a magnetic element, wherein preferably the magnetic element rotatably connected to the shaft and the reed contact rotatably connected to the handle.

Gemäß einer bevorzugten Ausführungsform der Erfindung weisen die Mittel eine Nockenscheibe mit wenigstens einem Nocken und einen Taster auf, wobei vorzugsweise die Nockenscheibe drehfest mit dem Schaft und der Taster drehfest mit dem Handgriff verbunden sind.According to a preferred embodiment of the invention, the means comprise a cam disc with at least one cam and a button, wherein preferably the cam disc rotatably connected to the shaft and the probe rotatably connected to the handle.

Vorzugsweise ist zwischen der Nockenscheibe und dem Taster ein Betätigungselement angeordnet, was insbesondere eine kompakte Anordnung innerhalb des Handgriffs ermöglicht.Preferably, an actuator is disposed between the cam and the button, which in particular allows a compact arrangement within the handle.

Vorzugsweise zählen die Mittel optisch, induktiv, kapazitiv oder mittels eines Piezo-Elements die Schaltzyklen.Preferably, the means include optical, inductive, capacitive or by means of a piezoelectric element, the switching cycles.

Gemäß einer bevorzugten Ausführungsform der Erfindung weist die Drehmomentbegrenzung zwei mittels Eingriffselementen, vorzugsweise mittels Rastzähnen, ineinander greifende Kupplungselemente auf, wobei der definierte Winkel durch den Winkelabstand zwischen zwei benachbarten Eingriffselementen definiert ist.According to a preferred embodiment of the invention, the torque limiting two by means of engagement elements, preferably by means of ratchet teeth, interlocking coupling elements, wherein the defined angle is defined by the angular distance between two adjacent engagement elements.

Gemäß einer besonders bevorzugten Ausführungsform der Erfindung entspricht die Zahl der magnetischen Elemente oder die Zahl der Nocken der Zahl der Eingriffselemente oder steht zu dieser in einem ganzzahligen Verhältnis, um auf diese Art und Weise eine direkte Korrelation zwischen der Relativdrehung zwischen Schaft und Handgriff und der gezählten Zahl der Schaltzyklen zu erreichen.According to a particularly preferred embodiment of the invention, the number of magnetic elements or the number of cams corresponds to the number of engagement elements or to this in an integer ratio, in order thus to a direct correlation between the relative rotation between the shaft and handle and the counted Number of switching cycles to achieve.

Die Erfindung wird anhand der folgenden Figuren ausführlich erläutert. Es zeigen

Fig. 1
eine Seitenansicht eines ersten Ausführungsbeispieles eines Schraubendrehers gemäß der Erfindung,
Fig. 2
einen Längsschnitt durch den Schraubendreher gemäß Figur 1,
Fig. 3
eine perspektivische Ansicht der Scheibe mit den magnetischen Elementen des Schraubendrehers gemäß Figur 2,
Fig. 4
eine Seitenansicht eines Schraubendrehers gemäß einem weiteren Ausführungsbeispiel der Erfindung,
Fig. 5
einen Längsschnitt entlang der Linie A-A gemäß Figur 4,
Fig. 6
eine Ansicht von hinten auf den Schraubendreher gemäß Figur 4 ohne Endkappe,
Fig. 7
eine weitere Seitenansicht des Schraubendrehers gemäß Figur 4,
Fig. 8
einen Längsschnitt entlang der Linie B-B des Schraubendrehers gemäß Figur 7 und
Fig. 9
eine perspektivische Ansicht der Nockenscheibe mit Betätigungselement und Taster gemäß Figur 8.
The invention will be explained in detail with reference to the following figures. Show it
Fig. 1
a side view of a first embodiment of a screwdriver according to the invention,
Fig. 2
a longitudinal section through the screwdriver according to FIG. 1 .
Fig. 3
a perspective view of the disc with the magnetic elements of the screwdriver according to FIG. 2 .
Fig. 4
a side view of a screwdriver according to another embodiment of the invention,
Fig. 5
a longitudinal section along the line AA according to FIG. 4 .
Fig. 6
a view from behind on the screwdriver according to FIG. 4 without end cap,
Fig. 7
another side view of the screwdriver according to FIG. 4 .
Fig. 8
a longitudinal section along the line BB of the screwdriver according to FIG. 7 and
Fig. 9
a perspective view of the cam with actuator and button according to FIG. 8 ,

In den Figuren 1 bis 3 ist ein erstes Ausführungsbeispiel eines Schraubendrehers 10 mit einem Handgriff 20 dargestellt, in welchen eine Drehmomentbegrenzungsmechanik integriert ist und in welchen ein Schaft 30 koaxial eingesetzt ist. Die Drehmomentbegrenzungsmechanik ist nicht Gegenstand der Erfindung und kann in unterschiedlichen Ausführungen ausgebildet sein. Wesentlich ist, dass der Schaft 30 koaxial drehbar in den Handgriff 20 eingesetzt ist und dass das auf den Handgriff 20 ausgeübte Drehmoment über eine Kupplung 78 der Drehmomentbegrenzungsmechanik auf den Schaft 30 übertragen wird. Dabei wird die Kupplung 78 zum Beispiel durch eine als Schraubenfeder ausgebildete Druckfeder 88 beaufschlagt, die die Kupplung 78 mit einer axialen Druckkraft in Eingriff hält. Die Kupplung 78 weist ein erstes Kupplungselement 80 und ein zweites Kupplungselement 84 auf. Das erste Kupplungselement 80 ist dabei drehfest mit dem Schaft 30 verbunden, während das zweite Kupplungselement 84 drehfest mit dem Handgriff 20 verbunden ist. Die beiden Kupplungselemente 80, 84 können dabei beispielsweise eine entsprechende Zahl von Rastzähnen 82, 86 aufweisen, die bei Eingriff der Kupplung 78 miteinander in Eingriff stehen. Überschreitet das von dem Handgriff 20 auf den Schaft 30 über die Kupplung 78 übertragene Drehmoment einen vorgegebenen Grenzwert, so wird die Kupplung 78 gegen die Kraft der Druckfeder 88 aus der Eingriffsstellung gehoben, sodass sich der Handgriff 20 gegenüber dem Schaft 30 drehen kann. Beispielsweise rutschen die Rastzähne 82, 86 übereinander, bis die Kupplung 78 wieder in Eingriff ist. Anstelle von Rastzähnen 82, 86 können auch anders geformte Eingriffselemente verwendet werden, beispielsweise auf Basis von Kugeln oder ähnliches. Als ein Schaltzyklus wird eine Verdrehung zwischen dem Schaft 30 und dem Handgriff 20 um den kleinsten möglichen Drehwinkel angesehen, welcher nach einem Herausheben aus einer Eingriffsstellung der Kupplung 78 nötig ist, bis die Kupplung 78 wieder in Eingriff ist, vorliegend beispielsweise der Winkelabstand zwischen zwei benachbarten Rastzähnen 82 des ersten Kupplungselements oder zwei benachbarten Rastzähnen 86 des zweiten Kupplungselements.In the FIGS. 1 to 3 a first embodiment of a screwdriver 10 is shown with a handle 20 in which a torque limiting mechanism is integrated and in which a shaft 30 is inserted coaxially. The torque limiting mechanism is not the subject of the invention and can be designed in different designs. It is essential that the shaft 30 is inserted coaxially rotatable in the handle 20 and that the force exerted on the handle 20 torque is transmitted via a coupling 78 of the torque limiting mechanism on the shaft 30. In this case, the clutch 78 is acted upon, for example by a helical spring designed as a compression spring 88 which holds the clutch 78 with an axial compressive force in engagement. The clutch 78 has a first coupling element 80 and a second coupling element 84. The first coupling element 80 is rotatably connected to the shaft 30, while the second coupling element 84 is rotatably connected to the handle 20. The two coupling elements 80, 84 may have, for example, a corresponding number of latching teeth 82, 86 which are engaged with each other upon engagement of the coupling 78. Exceeds the transmitted from the handle 20 to the shaft 30 via the clutch 78 torque a predetermined limit, the clutch 78 is lifted against the force of the compression spring 88 from the engaged position, so that the handle 20 can rotate relative to the shaft 30. For example, the ratchet teeth 82, 86 slide over each other until the clutch 78 is again engaged. Instead of ratchet teeth 82, 86 can also be used differently shaped engagement elements, for example based on balls or the like. As a switching cycle, a rotation between the shaft 30 and the handle 20 is considered by the smallest possible angle of rotation, which is necessary for a lifting out of an engagement position of the clutch 78 until the clutch 78 is engaged again, for example, the angular distance between two adjacent Latching teeth 82 of the first coupling element or two adjacent latching teeth 86 of the second coupling element.

Der Schraubendreher 10 weist Mittel zum Zählen der Schaltzyklen auf. Die Mittel zum Zählen der Schaltzyklen können dabei als aktive oder passive Bauelemente ausgebildet sein.The screwdriver 10 has means for counting the switching cycles. The means for counting the switching cycles can be designed as active or passive components.

In dem in den Figuren 1-3 dargestellten Schraubendreher 10 weisen die Mittel ein aktives Bauelement in Form eines Hall-Sensors 40 und eine Scheibe 50 mit mehreren magnetischen Elementen 52 auf. Als passive Bauelemente können beispielsweise alternativ zu dem Hall-Sensor 40 auch Reed-Kontakte verwendet werden. Der Hall-Sensor 40 ist drehfest mit dem Handgriff 20 verbunden. Die Scheibe 50 ist drehfest mit dem Schaft 30 verbunden und wird insbesondere von dieser koaxial durchsetzt. Die Zahl der magnetischen Elemente 52 entspricht vorzugsweise der Zahl der Eingriffselemente, insbesondere der Zahl der Rastzähne 82, 86 der Kupplung 78. Beispielsweise kann die Kupplung 78 ein erstes Kupplungselement 80 mit neun Rastzähnen 82 und ein zweites Kupplungselement 84 mit neun Rastzähnen 86 aufweisen. In diesem Fall sind an der Scheibe 50 ebenfalls neun magnetische Elemente 52 angeordnet (vgl. Fig. 3). Die magnetischen Elemente sind vorzugsweise aus magnetischem Kunststoff gefertigt. Weiterhin können die magnetischen Elemente 52 auf die Scheibe 50 aufgesetzt und an dieser befestigt sein. Vorzugsweise sind die magnetischen Elemente 52 und die Scheibe 50 einstückig ausgebildet und insbesondere aus magnetischem Kunststoff gefertigt.In the in the Figures 1-3 Screwdriver 10 shown have the means an active device in the form of a Hall sensor 40 and a disc 50 with a plurality of magnetic elements 52. As passive components, for example, alternative to the Hall sensor 40 and reed contacts can be used. The Hall sensor 40 is rotatably connected to the handle 20. The disc 50 is rotatably connected to the shaft 30 and is particularly coaxially penetrated by this. The number of magnetic elements 52 preferably corresponds to the number of engagement elements, in particular the number of ratchet teeth 82, 86 of the clutch 78. For example, the clutch 78 may have a first coupling element 80 with nine ratchet teeth 82 and a second coupling element 84 with nine ratchet teeth 86. In this case, nine magnetic elements 52 are likewise arranged on the disk 50 (cf. Fig. 3 ). The magnetic elements are preferably made of magnetic plastic. Furthermore, the magnetic elements 52 can be placed on the disc 50 and secured thereto be. Preferably, the magnetic elements 52 and the disc 50 are integrally formed and in particular made of magnetic plastic.

Der Hall-Sensor 40 ist insbesondere achsparallel zur Längsachse des Schafts 30 angeordnet und kann unterscheiden, ob sich ein magnetisches Element 52 in seinem Detektionsbereich befindet oder der Zwischenraum zwischen zwei benachbarten magnetischen Elementen 52. Der Hall-Sensor 40 ist dabei mit einer Auswerte-Elektronik verbunden, mit Hilfe derer gezählt werden kann, wie oft sich ein magnetisches Element 52 an dem Hall-Sensor 40 vorbeibewegt. Auf diese Weise können auch die Schaltzyklen der Kupplung 78 gezählt werden. Zur Stromversorgung des Hall-Sensors 40 und der Auswerte-Elektronik ist eine Batterie oder ähnliches vorgesehen.The Hall sensor 40 is arranged in particular axially parallel to the longitudinal axis of the shaft 30 and can distinguish whether a magnetic element 52 is in its detection range or the gap between two adjacent magnetic elements 52. The Hall sensor 40 is in this case with an evaluation electronics by means of which it can be counted how many times a magnetic element 52 moves past the Hall sensor 40. In this way, the switching cycles of the clutch 78 can be counted. To power the Hall sensor 40 and the evaluation electronics, a battery or the like is provided.

An dem Handgriff 20 ist ein nicht dargestelltes Display angeordnet, auf welchem mit Hilfe der Auswerte-Elektronik die Zahl der Schaltzyklen dargestellt werden kann. Weiterhin können auf einem derartigen Display auch der Status der für den Hall-Sensor 40 verwendeten Batterie oder, falls das Drehmoment der Drehmomentbegrenzungsmechanik des Schraubendrehers 10 variabel ausgebildet ist, das eingestellte Drehmoment angezeigt werden. Gegebenenfalls können bei Überschreiben vorgegebener Grenzwerte für die Zahl der Schaltzyklen oder das eingestellte Drehmoment oder kurz vor vollständiger Entleerung der Batterie entsprechende Warnsignale oder Warnhinweise ausgegeben werden.On the handle 20, a display, not shown, is arranged, on which with the aid of the evaluation electronics, the number of switching cycles can be displayed. Furthermore, the status of the battery used for the Hall sensor 40 or, if the torque of the torque limiting mechanism of the screwdriver 10 is variable, the set torque can be displayed on such a display. If necessary, appropriate warning signals or warnings can be output when overwriting predetermined limit values for the number of switching cycles or the set torque or shortly before complete emptying of the battery.

In den Figuren 4-9 ist ein weiteres Ausführungsbeispiel eines Schraubendrehers 10' dargestellt. Dieser unterscheidet sich von dem in den Figuren 1-3 dargestellten Ausführungsbeispiel des Schraubendrehers 10 im Wesentlichen durch die Ausgestaltung der Mittel zum Zählen der Schaltzyklen, während die Drehmomentbegrenzungsmechanik im Wesentlichen identisch ist. Der Schraubendreher 10' weist Mittel zum Zählen der Schaltzyklen auf, welche eine Nockenscheibe 70 und einen Taster 60 aufweisen. Die Nockenscheibe 70 ist drehfest mit dem Schaft 30 verbunden, während der Taster 60 drehfest mit dem Handgriff 20 verbunden ist. An der Nockenscheibe 70 sind Nocken 72 angeordnet. Vorzugsweise entspricht die Zahl der Nocken 72 der Zahl der Eingriffselemente der Kupplung 78. Insbesondere weist vorliegend die Nockenscheibe 70 zehn Nocken 72 auf (vgl. Fig. 9). Zwischen der Nockenscheibe 70 und dem Taster 60 ist im Wesentlichen parallel zur Längsachse des Schafts 30 ein Betätigungselement 75 angeordnet, sodass der Taster 60 radial innerhalb der Nockenscheibe 70 und axial zu dieser versetzt angeordnet sein kann, um eine kompakte Bauform zu erreichen. Dreht sich die Nockenscheibe 70 bei einer Relativbewegung zwischen dem Schaft 30 und dem Handgriff 20, wird durch die Nocken 72 das Betätigungselement 75 derart gekippt, dass das von den Nocken 72 abgewandte Ende des Betätigungselements 75 den Taster 60 betätigt. Eine mit dem Taster 60 verbundene Auswerte-Elektronik zählt die Betätigungen des Tasters 60 und somit die Zahl der Schaltzyklen der Kupplung 78. Die Zahl der Schaltzyklen oder weitere für den Benutzer relevante Informationen können auf einem Display 90 im Handgriff 20 des Schraubendrehers 10 angezeigt werden.In the Figures 4-9 is another embodiment of a screwdriver 10 'shown. This differs from that in the Figures 1-3 illustrated embodiment of the screwdriver 10 essentially by the design of the means for counting the switching cycles, while the torque limiting mechanism is essentially identical. The screwdriver 10 'has means for counting the switching cycles, which have a cam disc 70 and a button 60. The cam plate 70 is rotatably connected to the shaft 30, while the button 60 rotatably connected to the handle 20. On the cam plate 70 cams 72 are arranged. The number of cams 72 preferably corresponds to the number of engagement elements of the clutch 78. In particular, in the present case, the cam disk 70 has ten cams 72 (cf. Fig. 9 ). Between the cam plate 70 and the button 60, an actuating element 75 is arranged substantially parallel to the longitudinal axis of the shaft 30, so that the button 60 can be arranged radially inside the cam plate 70 and axially offset therefrom to achieve a compact design. Rotates the cam plate 70 in a relative movement between the shaft 30 and the handle 20, the actuating element 75 is tilted by the cam 72 such that the remote from the cam 72 end of the actuating element 75 actuates the button 60. An evaluation electronics connected to the button 60 counts the actuations of the button 60 and thus the number of switching cycles of the coupling 78. The number of switching cycles or other information relevant to the user can be displayed on a display 90 in the handle 20 of the screwdriver 10.

BezugszeichenlisteLIST OF REFERENCE NUMBERS

1010
Schraubendreherscrewdriver
10'10 '
Schraubendreherscrewdriver
2020
Handgriffhandle
3030
Schaftshaft
4040
Hall-SensorHall sensor
5050
Scheibedisc
5252
magnetisches Elementmagnetic element
6060
Tasterbutton
7070
Nockenscheibecam
7272
Nockencam
7575
Betätigungselementactuator
7878
Kupplungclutch
8080
erstes Kupplungselementfirst coupling element
8282
Rastzahnratchet
8484
zweites Kupplungselementsecond coupling element
8686
Rastzahnratchet
8888
Druckfedercompression spring
9090
Displaydisplay

Claims (10)

  1. Screwdriver (10, 10') comprising a handle (20), including torque limitation, and a shank (30) which is coaxially inserted into the handle (20), that can be rotated against the handle (20) and torsionally fixed thereto by means of the torque limiter, wherein each relative rotation about at least one defined angle between the shank (30) and the handle (20) represents an operating cycle, characterized in that the screwdriver (10, 10 ') has means for counting the operating cycles.
  2. Screwdriver according to any one of the above claims, characterized in that the means have a Hall sensor (40) and at least one magnetic element (52), wherein preferably the Hall sensor (40) is rotationally fixed to the handle (20) and the at least one magnetic element (52) is rotationally fixed to the shank (30).
  3. Screwdriver according to claim 2, characterized in that the magnetic element (52) is made of magnetic plastic.
  4. Screwdriver according to any one of claims 2 to 3, characterized in that a disc (50) is coaxially traversed by the shank (30) and is rotationally fixed thereto and at least one magnetic element (52) is arranged on the disc (50).
  5. Screwdriver according to any one of the above claims, characterized in that the means have a Reed contact and a magnetic element, wherein preferably the magnetic element is rotationally fixed to the shank and the Reed contact is rotationally fixed to the handle.
  6. Screwdriver according to any one of the above claims, characterized in that the means has a cam disc (70) with at least one cam (72) and a sensor (60), wherein preferably the cam disc (70) is rotationally fixed to the shank (30) and the sensor (60) is rotationally fixed to the handle (20).
  7. Screwdriver according to claim 6, characterized in that an actuator (75) is arranged between the cam disc (70) and the sensor (60).
  8. Screwdriver according to any one of the above claims, characterized in that the means count the operating cycles optically, inductively, capacitively or by way of a piezo element.
  9. Screwdriver according to any one of the above claims, characterized in that the torque limiter has two coupling elements (80, 84) engaging one another by means of engagement elements, preferably by means of ratchet teeth (82, 86), and the defined angle is defined by the angular distance between two adjacent engagement elements.
  10. Screwdriver according to claim 9, characterized in that the number of the magnetic elements (52) or the number of the cams (72) corresponds to the number of the engagement elements or stand in an integer relationship with each other.
EP12157844.7A 2011-04-14 2012-03-02 Screw driver with torque limitation Active EP2511048B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102011017061.8A DE102011017061B4 (en) 2011-04-14 2011-04-14 Screwdriver with torque limiter

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EP2511048A1 EP2511048A1 (en) 2012-10-17
EP2511048B1 true EP2511048B1 (en) 2015-08-05

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EP (1) EP2511048B1 (en)
CN (1) CN102773827B (en)
DE (1) DE102011017061B4 (en)
TW (1) TWI501842B (en)

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Also Published As

Publication number Publication date
DE102011017061B4 (en) 2015-12-31
CN102773827A (en) 2012-11-14
TWI501842B (en) 2015-10-01
CN102773827B (en) 2016-03-16
TW201244888A (en) 2012-11-16
DE102011017061A1 (en) 2012-10-18
EP2511048A1 (en) 2012-10-17

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