FR2481997A1 - SYNTHETIC ENCLOSURE HAVING INTERIOR DIRECTED PROJECTIONS AND METHOD OF MANUFACTURING THE SAME - Google Patents

Abstract

THE INVENTION CONCERNS A BOX MADE OF SYNTHETIC MATERIAL INCLUDING INNER-DIRECTED PROJECTS AND A PROCESS FOR MANUFACTURING THIS BOX. IN THE AREA OF THE PROJECTOR (S) 8, THE SURFACE OF WALL 1 OF THE HOUSING IS ENLARGED BEYOND THE REQUIRED DIMENSION BY FORMING ONE OR MORE FOLDES, DEFORMATIONS, CAVITIES, RIGOLS OR OTHER DESIGNED CONFIGURATIONS. THE INVENTION IS USED TO MANUFACTURE BOXES INTENDED IN PARTICULAR FOR ELECTRONICS AND INCLUDING INTERNAL PROJECTIONS INTENDED FOR THE INSTALLATION OF MOUNTING ELEMENTS.

Description

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  The present invention relates to a stacker

  synthetic material which may be embodied in a process

  injection molding die and having, on its inner side, one or more protrusions serving as limit stops or locking elements for the purpose of

  to maintain other mounting elements.

  The manufacture of such cases proves to be

  ordinarily difficult and, when the chamber of this box is made in the form of a blind hole, the manufacture of these boxes is almost impossible because,

  as a result of the presence of the projections, it can not be

  to remove the casing formed in

  the injection molding process.-

  Cases already known in synthetic material are already known.

  the interior is lined with stops, projections and the like. However, these elements are provided on the inner wall of the room where it is

  it is possible to arrange the stops, protrusions and

  in the plane of separation of a two-part spindle so that a part of this spindle is introduced on one side into the chamber, while the other part of this spindle is introduced on the other side, while shaping the projection or projections. In this case, it is often necessary to cut the two pins, that is to say that, over part of their length and one side, they must pass tightly and tightly against each other. So that such pins which are often less than 1 mm thick, do not touch by their upper edges when closing the tool, it is necessary that the aforementioned parts are provided with chamfers or made in a conical shape. Consequently, the manufacture of tools of this type for a molding by

  injection entails high costs even for manufacturers

  experienced tools, and only the best

  specialists in this field are able to achieve perfect manufacturing. As a result, the price of

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  returns from a tool of this type is extraordinarily

  and, ipso facto, it is the same with regard to

  identifies the cost of manufacturing a made-up box

  by an injection molding process.

  Accordingly, the object of the present invention is to provide a plastic housing

  which can be produced by an injection molding process

  jection and with projections directed towards the

  This box requires no complicated tools and is expensive, but can be manufactured with a simple tool with corresponding recesses.

  for projections, thus ensuring an eco-friendly

  nomic. For this purpose, according to the invention, in the case of the plastic casing which can be produced by an injection molding process and having projections directed inwards, in the region of the projection or projections, the surface of the wall of the box is enlarged beyond the required size by forming one or more folds, deformations, cavities, channels or

other shaped configurations.

  Thanks to this enlargement of the surface to

  In the vicinity of the protrusion, a protuberance may be formed in the wall during the demolding process, whereby the inwardly directed protrusion may be removed from the opening of the mold core, which core may then be removed from the housing. without damaging the

protrusion formed.

  Therefore, the present invention is based on the astonishing observation that, immediately after crystallization, the synthetic material formed during the injection molding process, for example, polyamide, still has an elasticity which, already

  shortly thereafter, reached a state of fragile

  which then disappears only by the absorption of moisture or water to give then the character

  specific to polyamide (nylon). Thanks to this elasticity

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  already existing immediately after the crystallization

  the enlarged wall may undergo reversal deformation

  during the very short period of the

  demolding and thus, thanks to the still existing elasticity

  aunt, the part of the wall in which was formed

  protuberance, immediately resume its original form.

  so that. when the finished casing is ejected from the mold, no modification can be observed any more despite this short-term deformation during the

demolding process.

  To form this protuberance in the wall of the housing enlarged by folds, deformations,

  cavities, channels or the like, the

  the elastic deformation of this enlarged part

  die of the wall without the material itself

  even of this wall extends. This elongation would be absolutely impossible even to the extent required because, for this purpose, the elasticity of the synthetic material would not be sufficient at the time of demolding the housing

finished.

  According to a feature that has proved particularly advantageous, in the new housing

  synthetic material according to the invention, the enlargement

  the wall in the form of folds,

  formations, cavities, channels or other

  shaped gurations, is provided on one side of the projection.

  By forming a protuberance in this part of the

  wall, the protrusion is removed from its opening in the -

  core of the mold, so that this core can be removed

  of the housing without damaging the projection.

  According to a particularly advantageous characteristic, the enlargement of the wall of the housing is on the side of the projection which, seen in the demolding direction of the core, is behind this

projection.

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  The elasticity (very important for the present invention) of the synthetic material immediately after

  crystallisation (solidification) in a per-

  putting the reversible formation of a protuberance in the enlarged wall of the housing, is particularly good

  in the case of synthetic materials based on poly-

  amides (nylon). Since most other tenacious synthetic materials nevertheless have the same properties and behavior, the synthetic sheath according to the invention can

  also be made with other usual materials.

the molding.

  The process according to the invention for the manufacture

  cation of a plastic casing by means of an injection molding process is characterized in that the projection (s) is (are) formed in the corresponding aperture (s) of the mold core while in the area of this or of these projections,

  the surface of the housing wall of synthetic material

  that is enlarged beyond the required dimension by forming one or more folds, deformations, cavities,

  channels or other shaped configurations corresponding

  dantes then, after shaping, the outer wall delimiting the mold is detached from the aforementioned wall of the housing which has a surface enlargement, while the projection is removed from the opening of the mold core forming a protuberance in the aforementioned wall , the casing then being demolded, after which

  the wall of this housing returns to its original shape.

  Any method can be adopted for

  protrude into the enlarged wall of the housing

tier.

  In addition, it was found that he was

  advantageously, when implementing the

  method of the invention, to remove the protrusion from the

  opening of the mold core by means of compressed air

  forming a protuberance in the wall of the casing.

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  In another embodiment of the method

  according to the invention, the protrusion is removed from the opening

  the core of the mold by means of an extraction pin additionally provided in the core of the mold and forming a protuberance in the enlarged wall of the housing, so that the core of the mold can be removed later from the casing. In this case, thanks to

  displacement of this extraction pin, which is de-

  stalled in advance, the projection is not

  deteriorated when removed from the mold core.

  According to another particular embodiment

  advantageously of the process of the invention, it is

  demoulding by forming, on the wall of the box

  made of synthetic material, at least one additional protrusion

  extraction chamber near the or projections in a corresponding opening of the mold core, this additional projection emerging, by rotation, from its position driven into the core of the mold during the demolding process with formation of a protrusion in the wall of the housing, while at the same time removing the projection or projections from their depressed position in the

core of the mold.

  With an embodiment of this type, it avoids any deterioration of the projection or projections, which is particularly important when it comes to

protrusions of complicated form.

  Therefore, this extraction projection is simply an auxiliary demolding element and it does not act as a delimiting stop or a similar element in the molded housing. That is why

  a possible deterioration of this projection of extrac-

  This is not detrimental to even the molded casing. In addition, according to another feature which has proved particularly advantageous, during the implementation of the method of the invention, the protrusion

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  extraction is formed next to the projection or projections

  in the wall of the housing. It is particularly

  tageux to arrange this projection of extraction in front

  the projections, seen in the direction of demolding the boot.

  The extraction projection formed on the shovel

  penetrates advantageously into the latter to a depth

  greater than that of the projection or projections which are further formed on the housing. In this way, during the demolding process, this extraction protrusion

  in the enlarged wall of the housing, a protuberance

  sufficient rancidity to the outside so that the additional projection (s) which are subsequently required as locking elements in the casing are not

  not deteriorated when removed from

  corresponding rests in the mold core.

  In addition, it has been found that, when carrying out the process of the invention, it was very

  advantageous to make a practically undercut edge

  perpendicular to the plane of the mold core on the additional extraction projection formed in the

casement wall.

  Thanks to this embodiment, under the demolding pressure acting in the axial direction, this extraction projection comes out, turning, from its recessed position in the core of the mold and, at the same time, it raises the enlarged wall of the housing thereby forming an outward protuberance therein, while the one or more projections formed adjacent the extraction projection on the casing wall are removed from their depressed positions in the mold core without being damaged, this core can then

be removed from the cabinet.

  Thanks to this process according to the invention, plastic boxes of this type can be made much more economically, since no complicated mold is necessary to form the molds.

  protrusions provided in the dwelling, as well as their counter

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  spoils. Therefore, thanks to the process following the invention

  insulation insulators can be made.

  these boxes with inwardly directed projections so as to be able to mount, lock and

  and snaps. The boatiers made according to

  according to the process of the invention are particularly suitable

  bond for insulation purposes, in particular for socket-outlets in which the contact elements are held by the projections thus formed. Consequently, the process according to the invention makes it possible to reduce considerably the production costs of

  these elements of insulation and, when it

  In the case of third-party blind-hole openings, this method allows for the very first time these projections to be formed in these openings in the form of blind holes.

  From the outset, following a particular embodiment

  Particularly advantageous of the present invention, the plastic housings made according to the method of the latter are characterized in that, on the wall of the boltier, an additional protrusion

  dextraction is formed close to the

  lees. This extraction projection advantageously comprises

  an undercut edge that is nearly

  pendicular to the plane of the mold, while it penetrates

  be deeper into the boxer than the other projections. The present invention will be described hereinafter in more detail by examples of embodiment illustrated in the accompanying drawings in which: FIGS. 1, 3 and 5 each represent

  embodiments of the housings made of synthetic material

  according to the invention in which the surface of the upper covering wall each time has a corresponding enlargement beyond the dimension

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  required by forming one or more folds, deformations,

  cavities, channels or other shaped configurations

  putting out a protuberance in this part of

Wall.

  In Figure 1, the upper part 1 of the wall has a flat deformation in the form of channel. This part 1 of the wall has the projection inside and, to unmould this projection out of the mold core

  provided inside the housing, a protuberance is formed

  in this part 1 of the wall after demolding of

the outer wall of the mold.-

  In FIG. 2, the plastic housing shown in FIG. 1 is illustrated with the wall of

  covering 2 in which is formed a protuberance.

  In FIG. 3, the covering wall has the projection directed inwards with a cavity 3

  in the form of a deformation directed towards the

  to form a protuberance 4 direction

  outward as shown in Figure 4.

  With this protuberance, the protrusion directed towards the in-

  can be removed from the core of the mold, so that the latter can also be removed from the casing without

  deteriorate the projection formed on the wall of the latter.

  Thanks to its elasticity, after demolding the case, the

  wall 4 having a protuberance in the form of a

  training immediately resumes its initial state as

represented in FIG.

  Figure 5 illustrates another form of reali-

  of a plastic case according to the

  in which lateral folds directed towards

  the interior can be used to identify or form a

  tubérance on the upper face 6 and the lower face

7 of the box.

  In all the embodiments illustrated in FIGS. 1 to 6, the channels, the deformations or the folds each have the amount of wall material necessary to allow the formation of a

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  protuberance and, hence, the extraction of the

  lie off the opening of the mold core. Without the

  deformation of the surface of the wall of the housing according to the invention in the form of channels, deformations, folds and the like in the area of the projection or projections, such deformation could not be obtained solely on the basis of the extensibility or flexibility of

the matter.

  As already noted in the introduction above, the formation of a protuberance (essential for the process according to the invention) in the part of the wall of the housing which is located in the area of the or protrusions, can be carried out using compressed air which, after removal of the external delimitation of the

  mold, acts through a corresponding aperture practically

  in the core of the mold in the area of the wall

  magnified plastic box.

  The second possibility of making the protu

  required in the enlarged wall of the casing is to use a spindle offset in advance in the mold core, lifting the enlarged wall of the casing and thereby causing the protrusion (s) to protrude from the openings in the mold core before this latest

not removed from the molded case.

  Referring to Figures 7 to 10, we will follow

  a much simpler method for

  sea a protrusion in the enlarged wall of the housing in order to unmold the projections formed inside without

to deteriorate them.

  In the case illustrated by a partial view-

  pruned in Figure 7, one can see the projection 8 formed on the cover wall 1, penetrating to

  inside and coming to rest, as shown in

  Tiles in Figure 8, in the opening 9 of the core 10 of the mold. In addition to this projection 8, on the enlarged inner wall and, seen in the demolding direction of the housing, is formed, in front of the projection 8, an additional protrusion

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  extraction It in a corresponding opening of the

  mold core, this additional projection being indicated

  dotted line in Figure 8, whereas it is

  This demisting projection 11 is formed on the wall of the plastic housing with an undercut edge approximately perpendicular to the

  plan of the mold core, while penetrating deeper

  in the housing that the protrusion 8, is removed from its opening made in this core by rotating, thereby lifting the enlarged wall 1 of the housing, so that the projection 8 is removed from its opening 9 made

  in the core 10 of the mold without the edge against

  clearance of this additional projection is deteriorated.

  As shown in FIG. 9, the core of the mold is then removed from the casing or, conversely, by means of a demolding element (not shown), the casing is slid away from the core 10 of the mold and consequently of the elasticity of the synthetic material, the wall 1 of the housing, on which a protuberance has been formed, as well as the projection 8 and the extraction projection 11, resumes its initial shape, as can be seen in =

figure 10.

  With regard to the housings illustrated in the accompanying drawings, these are insulating inserts for

electrical outlets.

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Claims (9)

CLAIMS 1 Bottier synthetic material that can be manufactured by an injection molding process and having inwardly directed projections, characterized in that, in the region of the projection (s) (8), the surface of the wall (1) of the casing is enlarged beyond the required dimension by forming one or more plies, deformations, cavities, channels or other shaped configurations. 2. A synthetic casing according to claim 1, characterized in that that the enlargement of the wall surface (1) of the casing is on one side of the projection (8), 3, plastic housing according to claim 2c characterized in that the enlargement of the wall surface of the casing is located on the side of the protrusion (8) which, seen in the demolding direction of the core (10), is located behind this projection (8) or the plastic bottier according to any one of claims 1 to 3, characterized n that an additional extraction projection (11il) is formed on the wall (1) of the casing near the projection or projections (8).   5. Plastic housing according to the   claim 4, characterized in that the protrusion dfex-   traction (11) has an undercut edge disposed approximately perpendicular to the plane of the core (10) of the mold. 6. Bottier synthetic material according to one   any of claims 4 and 5, characterized in that   the extraction projection (11) penetrates deeper   in the housing as the or the projections (8).   7. Synthetic bottier according to one   any of claims 1 to 6, characterized in that   it is made of a synthetic material based on polyamide. 2481,997   8. Method of manufacturing a shoemaker   synthetic material according to any of the claims   1 to 7 by means of an injection molding process   characterized in that the projection is formed in a corresponding opening of the core and, in the region of this projection, the surface of the casing wall is enlarged beyond the required dimension by forming one or more plies, deformations, cavities, troughs or other shaped configurations while, after shaping, the outer wall delimiting the mold   removed from the aforementioned wall of the casing whose   face has been enlarged, then the protrusion is removed from the   nucleus, forming a protuberance in the   king of the box, which is then removed from the mold, after which   the wall of this housing returns to its original shape.   9. A process according to claim 8, characterized   in that the projection is withdrawn from the opening of the core by means of compressed air forming a protuberance in the wall of the box.   10. Process according to claim 8, characterized   in that the projection is removed from the opening of the mold core by means of an extraction pin provided as an additional element in this core and forming a protuberance in the wall of the housing whose surface has been enlarged.   11. Process according to claim 5, characterized   in that, on the inner side of the wall of the plastic housing, at least one additional extraction projection is formed near the projection or projections in a corresponding opening in the mold core, this additional projection being removed by 2481,997   rotation of its position ellúOlcéeC dalns the core of the mold   during the demolding process to form a proto-   in the wall of the boltier, while withdrawing   the edges of which are protruding from their in the core of the mold.   12. Process according to claim 19,   tered in that the additional protrusion of extraction   is formed on the wall of the ebotier   only with an undercut edge approximately pearl to the plane of the mold core.   13. A method according to any one of claims 11 and 12s characterized in that the extraction projection is formed next to the or projections in the wall of the box.   14. Process according to any one of claims 11 to 13, characterized in that the projection of the extraction penetrates deeper into the boltier   that the projection or forsies on the wall of the latter 2 (>. )