FR2623576A1 - EXPANSIBLE BOLT FOR ANCHORING IN A DETALON HOLE - Google Patents

Abstract

Expanding bolt for anchoring in a bead hole. The bolt is composed of an expansion cone 4 pin 3, surrounded by a slotted expanding sleeve 5. The cone 4 of this pin 3 comprises at least two opposing bevels 10, starting from its anterior end. Application in particular for fixing objects 7 on a masonry wall 8.

Description

The present invention relates to an expanding bolt

  anchored in loosened holes, having a pin which is applied against the bottom of the hole and which

  has an expansion cone surrounded by an expansi

  partly split. Expandable metal bolts can be anchored almost effortlessly in cone flared holes, the expansive expansion of the expansible element

  creating a very large restraining force. Expanding bolts

  known cases include an expansion cone, on which it

  It is possible to push back an expandable sleeve using

  an appropriate percussion tool. The end of the spindle, which is threaded, protrudes from the hole and it can be locked in an object that is to fix, by means

of a nut.

  To properly mount an expansive bolt

  known, it is necessary to drive out the drilling dust by

  or injecting air. If the dust is not removed properly or if the calibration is not good

  executed, this dust collects itself in front of the

  top of the expanding sleeve while it is

  on the cone of expansion, so it takes more

  high energy to drive this socket and that, nevertheless,

  least, the latter can not be pushed back completely

on the cone.

  The invention relates to an expandable bolt for

  mortar hole, which allows a proper anchorage even if the drilling dust does not

been completely hunted.

  According to the invention, an expandable bolt of the above kind is characterized in that the expansion cone has at least two opposing bezels starting from its

anterior end.

  The tip formed by these opposite bevels thus bears against the middle of the bottom of the hole. The bevels release, between the bottom and the anterior end of the cone, a space where the residual drilling dust can take refuge while the expansible sleeve is depressed. This socket can thus be pressed on the expansion cone until its front end is against

the bottom of the hole.

  Bevels give the front end of the expansion cone the shape of a roof which otherwise acts to prevent the bolt from rotating if the expansible sleeve is

  driven by a rotary percussion tool.

  There is in particular enough room to receive the non-eliminated drilling dust, if the apex angle of two opposing bevels, equal to about 90, is smaller than the apex angle of about 120 of the drill used for

pierce the hole.

  In order to reduce as little as possible the area of application of the expandable sleeve on the cone, it is also possible to form on this cone four bevels in the form of notches. The anterior end of the cone forms

then a ridge on the cross.

  The invention will now describe, in more detail, examples which are in no way limiting, presented with reference to the appended drawings, in which

  FIG. 1 represents an expandable bolt introduced

  duit into a hole and dilated; Figure 2 shows at the end the expansion cone of the bolt of Figure 1; and Fig. 3 is an end view of another form of

realization of the expansion cone.

  The expandable bolt shown in FIG. 1 is introduced into a drilled hole 1 which has a relief 2

in the area of its bottom.

  This expandable bolt is composed of a spindle 3 with an expansion cone 4, on which an expansible sleeve 5 and

  slotted, intended to anchor the bolt, can be repelled.

  The end of the pin 3 which protrudes from the hole carries a thread 6, on which a nut 9 can be screwed to

  fix an object 7 to the wall 8 (or the element 8 of masonry).

  In the exemplary embodiment according to FIG. 1, the expansion cone 4 of the spindle 3 comprises two opposite bevels 10, starting from its front end and facing one another. The angle at the top of these two opposite bevels, equal to about 90, is smaller than that of the drill used to drill the hole. As a result, a space 11 is formed between the bottom of this hole and the bevels, which receives the drilling dust that the expansible sleeve 5 pushes towards the bottom when it is pressed on the cone 4. This sleeve can therefore be pushed back. completely on

this cone.

  The roof-shaped point (see FIG. 2), formed by the two opposing bevels, simultaneously acts by immobilizing the pin 3 in rotation, if the expandable sleeve 5 is driven out and subjected to expansion by a tool

rotary percussion.

  In the embodiment according to Figure 3, there are four bevel-shaped bevels 10 ', which give the anterior end of the cone 4 a cross-shaped configuration. It goes without saying that it is possible, without departing from the scope of the invention, to make various modifications.

  to the expandable anchor bolt, shown and described.

Claims (3)

  1. Expandable bolt for anchoring in detachable holes, having a spindle, which is applied against the bottom of the hole and which carries an expansion cone surrounded by a partially split expandable sleeve, bolt characterized in that the cone ( 4) of the spindle (3) comprises at least two bevels (10), which start from its   front end and which are vis-à-vis.   2. An expandable bolt according to claim 1,   characterized in that the apex angle of two opposing bevels (10) is smaller than that of the drill used for form the hole.   An expandable bolt according to claim 2,   characterized in that the angle at the top of two bevels cpposs is equal to about 90.