AT103878B

AT103878B - Clamping device for screw bolts during their machining.

Info

Publication number: AT103878B
Authority: AT
Inventors: Per Leonard Stenman
Original assignee: Per Leonard Stenman
Priority date: 1923-10-17
Filing date: 1923-10-17
Publication date: 1926-08-10

Description

  

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  Einspannvorrichtung für Schraubenbolzen während ihrer Bearbeitung. 



   Die Erfindung bezieht sich auf eine Einspannvorrichtung für einen Schraubenbolzen während seiner Bearbeitung mit einem gegen den Bolzenkopf federnd angepressten, innerhalb des Spannbackenfutters angeordneten Schraubenzieher. Das Wesen der Erfindung liegt darin, dass der Schraubenzieher während der Bearbeitung des Bolzens in dem Futter unverdrehbar gelagert ist, so dass er sich mit gleicher Geschwindigkeit wie letzteres dreht, während beim Einführen des Werkstückes in das Futter die Drehgeschwindigkeit des Schraubenziehers durch eine an der Einspannvorrichtung vorgesehene Reibungbremse auf eine geringere Umdrehungszahl, als sie das Futter hat, ermässigt wird. Hiedurch wird erreicht, dass das Werkstück, das bei seiner Einführung stillsteht, von dem Schraubenzieher sicher erfasst werden kann und hierauf dessen Bewegung folgt. 



   Auf der Zeichnung ist eine beispielsweise   Ausfühlungsform   einer Einspannvorrichtung nach der Erfindung in Ansicht, teilweise im Schnitt dargestellt. 
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  Clamping device for screw bolts during their machining.



   The invention relates to a clamping device for a screw bolt during its machining with a screwdriver which is resiliently pressed against the bolt head and which is arranged within the clamping jaw chuck. The essence of the invention lies in the fact that the screwdriver is non-rotatably mounted in the chuck while the bolt is being machined, so that it rotates at the same speed as the latter, while when the workpiece is inserted into the chuck, the rotational speed of the screwdriver is controlled by one on the clamping device provided friction brake is reduced to a lower number of revolutions than the chuck has. This ensures that the workpiece, which is stationary when it is inserted, can be securely grasped by the screwdriver and then follows its movement.



   In the drawing, an exemplary embodiment of a clamping device according to the invention is shown in view, partially in section.
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Claims

PATENT CLAIMS: 1. Clamping device for screw bolts with a screwdriver which is resiliently pressed against the bolt head and arranged within the clamping pool chuck, characterized in that the screwdriver is non-rotatable during processing of the screw bolt in the chuck, so that it rotates at the same speed as the latter, while the Introducing the workpiece into the chuck, the speed of the screwdriver is reduced by a friction brake provided on the clamping device to a lower number of revolutions than the chuck has, so that the workpiece, which is stationary when it is inserted, can be safely gripped by the screwdriver and taken along .

2. Device according to claim 1, characterized in that the screwdriver by means of a EMI2.1 that it is secured against both axial displacement and rotation relative to the clamping chuck, so that it cannot be pushed out of its working position by the load that occurs during thread cutting.

3. Device according to claim 2, characterized in that the screwdriver consists of two mutually axially displaceable parts which cannot rotate against each other, wherein the device for clamping the screwdriver in the chuck acts on the front part of the screwdriver. EMI2.2