CH576834A5

CH576834A5 - Extracting spring collet from bore of tool holder - involves nut held to collet by lip on spring and pulled free as nut is unscrewed

Info

Publication number: CH576834A5
Application number: CH952874A
Authority: CH
Original assignee: Schaublin Sa
Priority date: 1974-07-10
Filing date: 1974-07-10
Publication date: 1976-06-30

Abstract

The tool holder (1) has a bore forming a cone shaped seating for the spring collet (2). The nose (2a) of the collet also provided a similar seating for the tightening nut (3) screwed on the outer diameter of the tool holder. An annular groove (2b) is machined in the collet, at the apex of the cones and a matching recess (3b) is machined in the inner face of the nut. This recess is fitted with a ring type spring (4), open ended and with a lip across one end forming a segment of a circle. This lip locates in the collet groove and locks collet and nut together.

Description

  

  
 



   L'invention se rapporte à un ensemble comprenant une pince de serrage et un écrou équipé d'un moyen d'extraction faisant saillie dans une gorge périphérique de la pince.



   Différents moyens d'extraction plus ou moins compliqués ont déjà été proposés, qui servent à dégager la pince de serrage d'un cône intérieur d'un organe porte-pince (tel qu'une broche, un porte-outil).



   L'invention vise à fournir un moyen d'extraction qui soit simple et qui ne complique pas   l'usinage de    l'écrou.



   A cet effet il est prévu, selon l'invention, que ledit moyen d'extraction est une bague-ressort assise dans une gorge périphérique intérieure de l'écrou et pourvue sur une partie de sa périphérie d'un rebord qui fait saillie dans la gorge périphérique de la pince.



   Le dessin annexé représente, à titre d'exemple, une forme d'exécution de l'objet de l'invention. Dans ce dessin:
 La fig. 1 est une coupe longitudinale;
 la fig. 2 est une vue de côté de la bague d'extraction, et
 la fig. 3 est une coupe suivant la ligne III-III de la fig. 2.



   Le chiffre de référence 1 désigne un organe porte-pince qui peut être une broche ou un corps de porte-outil, par exemple; cet organe 1 a un cône intérieur recevant une pince de serrage 2; il a en outre un filetage extérieur sur lequel se visse un écrou 3 servant principalement à serrer la pince 2 dans le cône de l'organe 1, cet écrou ayant, comme d'habitude, un cône intérieur 3a qui, lors du serrage, agit sur une surface conique antérieure 2a de la pince de serrage 2.



   Entre son filetage et son cône intérieur 3a l'écrou 3 présente une gorge périphérique intérieure 3b dans laquelle est assise, avec un faible jeu axial, une bague-ressort d'extraction 4. Celle-ci est pourvue sur une partie de sa périphérie - de préférence à   l'un    de ses bouts, ainsi qu'on le voit à la fig.   2 - d'un    rebord 4a. Ce rebord fait saillie dans une gorge périphérique 2b ménagée dans la pince 2 entre les deux cônes. Il est facile à voir, que si on dévisse l'écrou de serrage 3, ce rebord' 4a exerce une pression sur la paroi antérieure de la gorge 2b si bien que la pince 2 sera dégagée du cône de l'organe 1.



   Ainsi qu'on le voit à la fig. 3, l'extrémité 4b de la bagueressort 4 qui est opposée à celle qui a le rebord 4a est coupée en biais en 4c. Quand l'écrou 3 est enlevé, il est ainsi possible d'engager la pointe d'un outil 5 (tel qu'un tournevis) entre cette extrémité 4b et le fond de la gorge 2b, puis de saisir cette extrémité avec une tenaille convenable, si   l'on    veut enlever la bague-ressort d'extraction 4.



   REVENDICATION



   Ensemble comprenant une pince de serrage et un écrou équipé d'un moyen d'extraction faisant saillie dans une gorge périphérique de la pince, caractérisé en ce que ledit moyen d'extraction est une bague-ressort assise dans une gorge périphérique intérieure de l'écrou et pourvue sur une partie de sa périphérie d'un rebord qui fait saillie dans la gorge périphérique de la pince.

**ATTENTION** fin du champ DESC peut contenir debut de CLMS **.



   



  
 



   The invention relates to an assembly comprising a collet and a nut equipped with an extraction means projecting into a peripheral groove of the collet.



   Various more or less complicated extraction means have already been proposed, which serve to disengage the collet from an internal cone of a collet holder member (such as a spindle, a tool holder).



   The invention aims to provide an extraction means which is simple and which does not complicate the machining of the nut.



   For this purpose it is provided, according to the invention, that said extraction means is a spring ring seated in an internal peripheral groove of the nut and provided on a part of its periphery with a rim which projects into the peripheral groove of the clamp.



   The appended drawing represents, by way of example, an embodiment of the object of the invention. In this drawing:
 Fig. 1 is a longitudinal section;
 fig. 2 is a side view of the extraction ring, and
 fig. 3 is a section taken along line III-III of FIG. 2.



   Reference numeral 1 denotes a collet holder member which may be a spindle or a tool holder body, for example; this member 1 has an internal cone receiving a collet 2; it also has an external thread onto which is screwed a nut 3 serving mainly to tighten the clamp 2 in the cone of the member 1, this nut having, as usual, an internal cone 3a which, during tightening, acts on an anterior conical surface 2a of the collet 2.



   Between its thread and its internal cone 3a the nut 3 has an internal peripheral groove 3b in which is seated, with a small axial play, an extraction ring-spring 4. This is provided on part of its periphery - preferably at one of its ends, as can be seen in FIG. 2 - a ledge 4a. This rim projects into a peripheral groove 2b formed in the clamp 2 between the two cones. It is easy to see that if the tightening nut 3 is unscrewed, this rim '4a exerts pressure on the front wall of the groove 2b so that the clamp 2 will be released from the cone of the member 1.



   As can be seen in FIG. 3, the end 4b of the spring ring 4 which is opposite to that which has the rim 4a is cut at an angle at 4c. When the nut 3 is removed, it is thus possible to engage the tip of a tool 5 (such as a screwdriver) between this end 4b and the bottom of the groove 2b, then to grip this end with a suitable pliers , if you want to remove the extraction spring ring 4.



   CLAIM



   Assembly comprising a collet and a nut equipped with an extraction means projecting in a peripheral groove of the clamp, characterized in that said extraction means is a spring ring seated in an inner peripheral groove of the nut and provided on a part of its periphery with a rim which projects into the peripheral groove of the clamp.

** ATTENTION ** end of DESC field can contain start of CLMS **.

Claims

** ATTENTION ** start of field CLMS can contain end of DESC **.

The invention relates to an assembly comprising a collet and a nut equipped with an extraction means projecting into a peripheral groove of the collet.

Various more or less complicated extraction means have already been proposed, which serve to disengage the collet from an internal cone of a collet holder member (such as a spindle, a tool holder).

The invention aims to provide an extraction means which is simple and which does not complicate the machining of the nut.

For this purpose it is provided, according to the invention, that said extraction means is a spring ring seated in an internal peripheral groove of the nut and provided on a part of its periphery with a rim which projects into the peripheral groove of the clamp.

The appended drawing represents, by way of example, an embodiment of the object of the invention. In this drawing: Fig. 1 is a longitudinal section; fig. 2 is a side view of the extraction ring, and fig. 3 is a section taken along line III-III of FIG. 2.

Reference numeral 1 denotes a collet holder member which may be a spindle or a tool holder body, for example; this member 1 has an internal cone receiving a collet 2; it also has an external thread onto which is screwed a nut 3 serving mainly to tighten the clamp 2 in the cone of the member 1, this nut having, as usual, an internal cone 3a which, during tightening, acts on an anterior conical surface 2a of the collet 2.

Between its thread and its internal cone 3a the nut 3 has an internal peripheral groove 3b in which is seated, with a small axial play, an extraction ring-spring 4. This is provided on part of its periphery - preferably at one of its ends, as can be seen in FIG. 2 - a ledge 4a. This rim projects into a peripheral groove 2b formed in the clamp 2 between the two cones. It is easy to see that if the tightening nut 3 is unscrewed, this rim '4a exerts pressure on the front wall of the groove 2b so that the clamp 2 will be released from the cone of the member 1.

As can be seen in FIG. 3, the end 4b of the spring ring 4 which is opposite to that which has the rim 4a is cut at an angle at 4c. When the nut 3 is removed, it is thus possible to engage the tip of a tool 5 (such as a screwdriver) between this end 4b and the bottom of the groove 2b, then to grip this end with a suitable pliers , if you want to remove the extraction spring ring 4.

CLAIM

Assembly comprising a collet and a nut equipped with an extraction means projecting in a peripheral groove of the clamp, characterized in that said extraction means is a spring ring seated in an inner peripheral groove of the nut and provided on a part of its periphery with a rim which projects into the peripheral groove of the clamp.