FR2464569A1 - MILLING SCREW - Google Patents

Abstract

THE INVENTION RELATES TO A MILLING SCREW. IN THE MILLING SCREW 1 INTENDED TO ENTER THE INSULATION OF AN INSULATED ELECTRIC CONDUCTOR AND INCLUDING MILLING GROOVES STARTING FROM THE FRONT FACE AND A HIDDEN PART MADE IN THE FRONT FACE AND WHICH FORM AN ANNULAR EDGE PRESSING THE INSULATION OF THE CONDUCTOR, A RING 6 INCLUDING AN APPOINTED FLANGE 8, 9 PROJECTING BEYOND THE FRONT FACE OF THE SCREW, IS MOUNTED SO AS TO BE ABLE TO PIVOT ON THE FRONT END OF THE MILLING AUGER. APPLICATION ESPECIALLY TO CLAMPING SCREWS FOR ELECTRIC TERMINALS.

Description

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  The present invention relates to a screw for

  wise to cross the insulation of a driver

  electrical device and having milling grooves from its end face and a recessed portion formed in said end face and forming an annular edge

pressing the driver's insulation.

  In such a milling screw (French Patent No. 1,319,854), the front face of the milling screw

  is provided with a concavity and the annular edge obtained

  fishing that during the milling operation, the insulation of the driver does not deviate on the sides-. During the milling operation, that is to say during the rotation of the screw, said edge slides on the insulator of the driver, which on the one hand provides increased friction and secondly

  does not completely prevent a lateral exit of the iso-

  lant. The present invention aims to create a

  milling screw, which makes it easy to

  milling and completely prevents

  side of the driver. To resolve this problem

  it is provided according to the invention that a ring

  carrying a raised flange, protruding beyond the front surface of the milling screw, is mounted

  so that you can turn on the front end of the-

  called screw. This embodiment according to the invention leads to that, during the milling operation, the milling screw rotates relative to the ring, that is to say

  that the ring remains fixed and that the edge formed by the collar

  lerette is applied firmly to the insulation of the

  conductor and penetrates in said isDant until it conducts it contacts.

  Preferably the ring can be located in

  a peripheral groove of the milling screw. In order to

  troduce the ring in the peripheral groove of the screw of

  milling and maintaining it in a permanent way,

  The ring may be provided with a tapping and the element of

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  the milling screw, located in front of the peripheral groove

  can be provided with an external thread corresponding to

  laying. The ring is then screwed onto the element of the milling screw, which is located in front of the peripheral groove, then leaves this thread and consequently reaches the peripheral groove of the screw of

  milling and is maintained there with the possibility of

  tion. By way of example, one has described below and illustrated schematically in the accompanying drawings a form

  of accomplishing the object of the invention.

  Figure 1 shows a section of the lower part of the milling screw and the ring, in

their unassembled state.

  FIG. 2 represents a larger-scale section of the lower part of the clamping screw, on

which ring is mounted.

  From the front face of the milling screw 1 start slots or milling grooves which receive and evacuate the material released from the insulator of the conductor (not shown) and of which only a.rainage-milling 2 is shown. A short distance back from the front face of the screw is machined in the latter, the peripheral groove 3, at which the remaining diameter of the screw is slightly less than the diameter of the core of the threaded portion 4 of the screw of

  milling. The thread of the milling screw remains con-

  served on the element 5 of said screw, which remains in

before the peripheral gorge.

  The ring 6 is provided with a tapping 7 which corresponds to the thread 4 of the milling screw. From the ring 6 extends a collar 8 which is

  appointed on its front end 9.

  From the relative position of the parts shown in FIG. 1, the ring 6 is screwed on

  the front element 5 of the milling screw and reaches

  then, after leaving the threaded part, in the

  groove-device 3 in which the ring can pivot

  ter with respect to the milling screw (see figure 2).

Claims (3)

  1) Milling screw to cross the insulation   an isolated electrical conductor having milling grooves from its end face and a recessed portion in said end face and   forms an annular edge pressing the insulator of the   characterized in that a ring (6) comprises   a shaped flange (8, 9) protruding beyond the end face of the milling screw is pivotally mounted on the front end the milling screw (1).   2) milling screw according to claim 1, characterized in that the ring (6) is located in a peripheral groove (3) of the milling screw (1).   3) milling screw according to claim 2, characterized in that the ring (6) is provided with a thread (7) and that the element (5) of the milling screw (1), which is located in before the peripheral groove (3),   is provided with a corresponding external thread (4).