FR2535187A1 - PLASTIC ATTACHMENT - Google Patents

Abstract

A PLASTIC FASTENER 10 INTENDED TO BE PUSHED AXIALLY ON A THREADED OR STOPPER SOCKET S INCLUDES A HOLLOW WELL 12 OF WHICH PART OF THE WALL CONSISTS OF A FLEXIBLE ELASTIC FINGER 16. THE FINGER SHOWS A DEEP LIP INTENDED FOR SINCE ANCHOR UNDER THE HEAD OF A T-SHAFT, AND OPPOSITE THIS ONE, A WINDOW 24 IS PROVIDED IN THE WELL OF THE WELL OF WHICH THE BOTTOM 26 CONSTITUTES A CORRESPONDING LIP INTENDED TO ANCHOR UNDER THE OTHER SIDE OF THE 'ERGOT SHOULDER. THE ATTACHMENT SHOWS A TAKING OUT RESISTANCE GREATER THAN THAT GENERALLY OBTAINED Hitherto with fasteners having a closed hollow well at its end.

Description

The present invention relates to a fastener

  plastic carrier comprising means for anchoring under a peripheral shoulder of a lug projecting from a surface, and comprising a hollow well inside which the lug can be received, provided with one or more lips internal to engage with the shoulder

ergot.

  The plastic fasteners of the type below

  intended to be mounted on T-pins, or

  lugs with annular ribs or threads constituting

  killing the peripheral shoulder of the pin,

  typically a relatively narrow inner lip surrounding the hollow wells (or lips surrounding parts of

  wells when the wells are separated into two or more

  parts intended to provide elasticity and

  flexibility, to enable them to be more

  cilation pushed axially on the pins) In practice,

  the depth of the lips is limited by the fact that

  the fasteners are obtained by injection molding and

  that when the well is closed at its forward end, the

  must be able to be axially separated from the core

  This type of fastener is described

  for example in British Patent No. 1,236,407.

  Although the fasteners mentioned here are

  used for a variety of purposes, for

  the fixing of rugs and carpets on the floor of vene-

  motorized vehicles to which appropriate lugs have been welded, and that such fasteners provide adequate retention on the lugs for such purposes, there are cases where it is desirable to push a fastener

  axially on a spigot with threaded head and ob-

  hold a resistance significantly higher than the tear-off

  is lying. Thus an object of the invention is to provide a plastic fastener intended to be pushed on

  a spigot with a head or thread and with resistance to

  superior to that usually obtained.

  This object is achieved according to the invention by a

  stain of the type mentioned, it is graded in that the well is provided on the one hand with a sluggish Tz Upe surrounding the well on at least 180, but not on its entirety, and on the other hand with an elastic finger located in the delimited interval

  between the ends of the skirt, and in that said

  one is on the finger, and the other on the skirt, coplanar with the first, the lip on the

  skirt constituting an extension of the bottom of a window

  pouring said skirt diametrically opposite the finger, and at least as wide as the finger, so that the lip on the finger can be formed by an injection molding operation using a

  lateral core which also forms said window.

  Preferably, the well of a fastener according to

  In addition, it is preferable that the inner edge of the lip on the finger, at its center line, is not spaced from the shaft axis by more than half the inner radius. The skirt and the finger can be chamfered inside their free ends, in order to facilitate

  mounting the fastener on the lug.

  Although the invention is described herein by reference

  With a fastener for attaching mats to motorized vehicle floors, it will be understood that the head of the lug may take any suitable shape, that is, to grip a workpiece on the surface of the vehicle. protrudes the lug on which the fastener is mounted, either to receive any other article, for example a pipe or a cable which it is desirable to fix the position relative to the lug A fastener according to the invention can be designed to apply to either a T-pin or a pin with annular ribs

or threaded.

  A fastener according to the invention is described below.

  below as an illustration, this description being

  given by way of non-limiting example.

  In the accompanying drawings Fig 1 is a side view partially in section of a fastener according to the invention; Fig 2 is a bottom view of the fastener according to the invention; and Fig. 3 is a sectional view of the fastener according to

line III-III of Figure 2.

  With reference to the accompanying drawings, the attachment illus-

  is injection molded from a thermally

  elastic mo-plastic, preferably a nylon 6,6 (registered trademark) It has a head 10 roughly rectangular contour (although one could have chosen any other

  desired shape), slightly hollowed out on its lower side.

  to provide a means of clamping against the material

  riau M, for example a carpet, on which its edge

  when it is mounted on a spigot with a head or

  in the present case in the form of a S-shaped lug welded to a panel P. The illustrated clip comprises a hollow cylindrical well 12, a portion of which acts as a skirt 14 rigidly

  protruding from the underside of the head 10, and which is

  tends around the well over 1800, and of which another

  part is an elastic finger 16 also

  binds from the head 10 and received between the ends

18, 20 of the skirt 14.

  So that the finger 16 may include a lip-deep 22 for anchoring under the head of a pin

  T-shaped, the cavity in which the fastener was molded

  had a lateral nucleus (not shown) which

  laterally in the cavity from the opposite side of the finger, also provided a window 24 in the skirt

  The window comprises a coplanar bottom with the

  22, projecting towards the axis of the well, but however shorter than the lip 22. In the case where the well has an external diameter of 7.5 mm and an internal diameter of 5.7 mm, the lip 22, level of its center line, is 1.15 mm from the well axis (ie less than half of the inter-well radius), while the bottom

  26 (which constitutes the lip of the skirt intended to

  under the head of the spigot T), at its central line, is 2.25 mm away from the axis (which would be normal for the inner edge of the lip of a fastener of this type) that so far formed by a nucleus

  axial in an injection molding apparatus).

  For convenience of molding, the

  18, 20, of the skirt 14 are spaced a distance

  equal to the internal diameter of the well 12, the bottom 26 extends

  around an 1800 arc and the inner wall of the well extending into two parallel planes from

  ends at the bottom, from the other side of the finger 16,

which are spaced 2 mm apart.

  The skirt and the finger have inside their free ends chamfered surfaces 28, 30,

  respectively, to facilitate the guidance of the

stain axially on a spur.

  The attachment given by way of example is not

  excessively complex or expensive to manufacture, and,

  thanks to the ease of its mounting on a lug, it is held in place more firmly than it normally is

  the case with carpet fasteners of this type.

Claims (4)

R E V E N D I C A T IO N S   1 Plastic fastener comprising   means for anchoring under a peripheral shoulder.   a lug protruding from a surface, and comprising a hollow well within which the lug can be received, provided with one or more internal lips intended to engage with the shoulder of the spigot, characterized in that the well (12) of the fastener is provided on the one hand with a rigid skirt (14) surrounding the well (12) on at least 180, but not on its entirety, and on the other part of a   elastic finger (16) in the interval between the   trenches (18, 20) of the skirt (14), and in that said   lips are provided one (22) on the finger (16) and the other   (26) on the skirt (144) and coplanar with the first, the lip on the skirt constituting an extension of the   bottom (26) of a window (24) passing through said skirt of   diametrically opposed to the finger (16), and at least   wide than the finger, so that the lip (22)   killed on the finger can be formed by an operation of   injection molding using a lateral core which   me also said window (24).   Fastener according to claim 1, characterized   in that the well (12) is closed at its front end.   Fastener according to claim 1, characterized   in that the inner edge of the lip (22) on the finger (16), at its central line, is not spaced from the shaft axis (12) by more than half the inner radius of the well.   4 Fastener according to any one of the claims   previous arrangements, characterized in that the skirt (14) and   the finger (16) are chamfered inside their ex-   free ends (28; 30), in order to facilitate the assembly of tie on a lug.