FR2492181A1 - BODY WITH PREFABRICATED SURFACE COATED WITH A LUBRICANT - Google Patents

Abstract

THE INVENTION CONCERNS A BODY WHOSE SURFACES ARE COATED WITH A FACTORY APPLIED LUBRICANT. THE OUTER SURFACE OF THE BODY WEAR A LAYER 13 OF LUBRICANT APPLIED IN THE FACTORY AND COATED WITH A PROTECTIVE LAYER 14 CONSTITUTED OF A MATERIAL WHICH IS NOT DIRTY, PREFERREDLY PARAFFIN AND STEARIN. THIS MATERIAL, WHICH PRODUCES A CERTAIN LUBRICATING EFFECT, IS EASILY BREAKED AT THE BEGINNING OF THE BODY'S PENETRATION IN A MATERIAL TO BE PERFORATED, SO THAT THE UNDERLYING LUBRICANT 13 CAN EXIT EASILY AND DISTRIBUTE OVER THE SURFACE OF THE BODY 5. 'APPLICATION: REALIZATION OF PIPES IN FIRE-TIGHT PARTITIONS.

Description

The invention relates to a body having one or more surfaces

  subjected to friction when the body is used in practice at a workplace or site of use, which surfaces are coated with a lubricant from the time of manufacture at the factory and are

so lubricated.

  In the place of use, the lubricant was previously applied by means of an appropriate lubrication tool, for example by injection into a hole in which the element or the body concerned must be introduced,

  which meant an additional operation and a

  dirty in many cases.

  Lubricant coated bodies can be

  provided, for example, under a plastic envelope.

  However, the disadvantage is that in this case a large part of the lubricant remains inside the casing

  when the body is removed and, in addition,

  body pulsion is very often messy. The tests focused on the placement of a thin sheet of plastic covering the lubricant and can remain in place during the installation of the body. This sheet is intended to break and allow the underlying lubricant to come out. However, it has been found that the desired effect is not achieved due to, among other things, the hardness of the plastic and its poor lubricating effect. Even in the case where the plastic sheet breaks as desired, it often appears that this break appears only at one point, which results in poor distribution of the lubricant. In addition, the plastic sheet follows the body and

  this also prevents the obtaining of the lubricating effect

  Haite. The subject of the invention is bodies or elements having a prefabricated surface coated with a lubricant, which makes it possible to avoid the operations described above,

  carried out at the place of use and eliminating the

  the presence of a messy lubricating surface.

  In addition, the body according to the invention is designed so that 24921n1

  the lubrication effect is obtained safely.

  The invention is characterized in that

  side coated with lubricant, externally to the lubricant

  a protective coating made of a material which has a certain lubricating effect and which breaks easily at the beginning of the introduction into a material or a hole, so that the underlying lubricant can come out. According to the invention, the protective layer advantageously consists of paraffin or stearin which are of a lubricating nature and which can break

  easily under moderate load. Such a layer of pro-

  tection can be produced simply by immersion in

  a melt having a controlled temperature

ably.

  In an advantageous application of the invention, the body constitutes the conical penetration point intended for producing a fire-proof passage, in a

  cellular and elastomeric material, fire resistant.

  The invention will be described in more detail with reference to the accompanying drawing by way of non-limiting example and in which: FIG. 1 is an exploded elevation, partly in section, showing the production of a hole in a sealing body at fire; and

  FIG. 2 is a section on an enlarged scale

line II-II of Figure 1.

  FIG. 1 represents a fire-resistant body 1 introduced, for example molded, into a wall 2.

  fire-proof body consists of a cellular

  3, advantageously a silicone foam, which expands

  inside a housing 4 and takes on an anal-

  - to rubber foam to form a fireproof seal. The cellular material is maintained under compression-by the housing, transversely to the longitudinal axis of the latter. To pass a duct through the fire-proofing body shown as

  example in FIG. 1, a perforation tool is used.

  which comprises, in this case, three parts, namely a conical tip 5, a sleeve 6 and a handle 7 carrying

a head 8.

  As shown in FIG. 1, the tip 5 is first properly sunken alone in the cellular material 3. The front end 9 of the sleeve is inserted into the tip and, using the handle, this tip and

  the sleeve are further embedded in the cellular material

  lar. When the point has crossed this matter, it falls all alone. To achieve this crossing, one can exert a pressure of the handle 7 on the rear end of the sleeve, an annular depression groove being formed in the head 8 of the handle to introduce

  the end of the sleeve during the execution of the

  See. By giving the head 8 a particular shape

  both a recess 11 allowing the attachment on two of four abutments 12 spaced regularly around the circumference of the sleeve 6 and located near the rear end of this sleeve, can be penetrated and cross the tip

  5 and the sleeve 6 once this attachment has been achieved.

  It is possible, alternatively, to incline the handle 7 relative to the sleeve, which is appreciable in places

difficult access.

  After the sleeve 6 has been pushed through the fire seal body 3 and a conduit has been passed

  in the sleeve, the sleeve is removed with the help of

year 7.

  To reduce the force required to achieve the

  penetration and removal of the sleeve, it is

  to lubricate tip 5 with a suitable lubricant. This operation can obviously be carried out at the place of use, but it is then necessary to carry out an additional operation using an appropriate tool of

  lubrication. The invention makes it possible to eliminate this

  tion and, in the case of the example described, the tip 5 is delivered to the place of use covered with a lubricant which is applied at the time of manufacture of this tip, without the handling of the latter is messy

  because of the presence of the lubricant.

  As shown in Fig. 2, the tip 5 carries a coating 13 of lubricant which itself is covered with a protective layer 14. It is essential that the protective layer 14 produce a lubricating effect without being messy when is manipulated, and it is also essential that it breaks under the mechanical force to which the tip 5 is subjected at the beginning of the penetration, so that the lubricant comes out and spreads around the tip. It has been found that paraffin and stearin are a suitable material for the protective layer. Apart from the characteristics indicated above, this material has the advantage of being able to be applied in a simple manner by immersion of the tips 5 in a molten bath,

  set to an appropriate temperature.

  It has been found that the lubricant layer 13 and the protective layer 14, as described above, make it possible to reduce the penetration and withdrawal force to a value between one half and one third of the

  force demanded in the absence of these layers.

  The present invention has been described above in particular applications such as that shown by way of example in FIGS. 1 and 2. However, there are several other fields of use in which a body or element having a prefabricated surface coated with lubricant and surrounded by an outer layer

  protection in a suitable matter, for example in paraf-

  fine or stearin, can be used advantageously.

  It goes without saying that many modifications can be made to the body described and represented without

depart from the scope of the invention.

249218 1

Claims (2)

  1. Body having a prefabricated surface coated with a lubricant for reducing the friction occurring upon insertion of the body into a material or into a hole made therein, characterized in that the lubricant-coated surface is covered, externally to the lubricant (13), a   protective layer (14) of a material producing a cer-   a lubricating effect that breaks easily at the beginning of the introduction into the material (3) or into the hole, so that the underlying lubricant (13) can come out. 2. in that paraffin or 3. in that the stearin is melting. Body according to claim 1, characterized protective layer (14) consists of stearin.   Body according to claim 2, characterized paraffin protective layer (14) or applied by immersion in a mass of   4. Body according to any one of the claims   characterized in that it comprises a conical forward tip (5) intended to penetrate into a fire-resistant passage (1) made of a material   cellular and elastomeric (3) fire resistant.