FR2556584A2 - Dental tool fixing system - has cone shaped clamp which is screwed to fasten drill in place - Google Patents

Abstract

The tool holder (1) has connected at its rear part a mechanism (2) to produce vibration. In a cut-out (3) of the head of the tool holder is a tool (4) such as a drill which lies inclined to the axis of the tool holder. The drill is held by the upper edge (5) of a first clamp element (6) which is formed by a threaded cone on the front end of the tool holder. This first element has a second element (7) screwed to its rear end. The sleeve (7) clamps the element (6) against loosening whereby the clamp element (6) can not be separated from the drill and thus from connection with the vibrating tool holder (1).

Description

This Addition Certificate concerns a perfec-

  vibration boring systems described in brief

main vet.

  In this type of system, a tool such as a reamer, of the type described in particular in patent N 82/18545, is inserted in

  a housing arranged obliquely to the axis of a holder

  tool itself equipped with a vibration generating device, for example a pneumatic turbine, the rotor of which has a

  imbalance, and whose rotation at very high speed gives birth

  sance to vibrations at frequencies of the order of 300 HZ.

  The device provided for fixing the tool, in particular

  the reamer in its housing provided in the main patent

  is in a sleeve coaxial with the tool holder, and which, by screwing

  forward over the external shape of said tool holder, up to

  that in contact with the reamer, determines the blocking. of the latter.

  This device has an inherent drawback

  system itself. Indeed, this system working by vibra-

  tions, the latter inevitably cause the unscrewing of this socket, and consequently the unlocking of the reamer which, even if it is not released from its housing, no longer receives the

  vibrations that ensure its effectiveness.

  The present invention aims to remedy this inconvenience.

  comes. It consists in blocking the tool in its housing by a first element fitted (by force) on a seat

  conical of the tool holder, this first element itself being

  held in place by a socket similar to the system socket

  known. A second lock nut effect is thus obtained.

  lying on the first, guaranteeing its immobility, therefore the blocka-

  age of the reamer, despite the vibrations to which it is subjected.

  The fitting of the first element on the tool holder can

  simply by rubbing on the seat, but preferably

  It is made by screwing, even in the same direction as the

  socket, like a real nut / counter assembly

  nut. The invention will be better understood thanks to the appended drawing,

  whose single figure, similar to figure I of the main patent

  pal, is a section through the axial plane of symmetry of a system

according to the invention.

  We find in this drawing the tool holder 1, comprising

  at its rear part a mechanism 2 for generating vibra-

2 2556584

  tions, of a type known per se, for example a tire turbine

  matic to unbalance. In a housing 3 of the head of this holder

  tool is inserted a tool 4 such as a reamer, oblique by rappc

  to the axis of the tool holder. According to the invention, this reamer is blocked

  qué in position by the upper edge 5 of a first fastening element 6, consisting of a threaded cone screwed on the front of the tool holder, this first element being itself immobilized

  by screwing, on its rear part, a second element 7, also

  screwed onto the tool holder in the same way as the single socket

than the main patent.

  The socket 7 blocks the element 6 opposite its screw

  wise like a lock nut on a nut, which inter-

  tells element 6 to move away from al9soir 4 by decoupling it

  health of the vibrating tool holder 1, which is the purpose of this invention

tion.

  Of course the first element 6 could be both conical and cylindrical, fitted by friction or by

  screwed onto the head of the tool holder.

Claims (3)

  1. Device for fixing a dentistry tool such as an al9soir on a tool holder equipped with a vibration generator of the type according to claim I of the main patent in which the tool (4) is locked in its housing by the upper edge (5) of an element (6) screwed onto the tool holder,   characterized in that said blocking element (6) is itself   even immobilized by a second element (7) screwed behind it on   the tool holder, like a nut / lock nut assembly.   2. Device according to claim 1, characterized in that the first element (6) is fitted by friction or screwed onto the head of the tool holder.   3. Device according to claims I and 2, characterized   in that the first element (6) is conical or cylindrical.