FR2618839A1 - ARTICULATED CONNECTION BETWEEN TWO PIECES OF PLASTIC MATERIAL IN PARTICULAR OF THE HINGE TYPE - Google Patents

Abstract

An articulated connection 3 between two parts 1, 2 of plastic material comprises an outer element 4 in the form of a cap, formed on one 1 of said parts, as well as an internal element 5 formed on the other part 2, and embedded in the less partially in the outer element 4. These two elements 4, 5 are molded by injection one into the other, in a tool.

Description

t

  The present invention relates to a link arti-

  abutment between two plastic parts, one of which

  can turn at least partially towards the other.

  In the state of the art, a structure of this kind is already known, for example, in which the two plastic parts, one of which is produced as a bearing part and the other materializes the halves of '' a clamping jaw, are connected to each other by

  through a short monobloc band forming a hinge

  re and acting as an articulated link (DE-A-30 14 578).

  In structures of this type, using a hinge band as an articulated connection, the disadvantage is that the risk of breaking the hinge is considerable in the presence of hard material, because of the necessary bending zone. , about 90 for example. Furthermore, the material used becomes disadvantageously dependent on the film hinge, that is to say that the entire structure must be adapted, as for its

  elasticity, to the design of this hinge.

  In a two-component injection molding process

  posants ", there is another drawback, again, in the need to use a material which is

  adapted to the design of the above-mentioned hinge.

  As a variant of this familiar state of the art, it is universally known to manufacture the two plastic parts individually and to connect them to each other, which however involves significant production and spare parts costs. To this end, two tools must necessarily be available to produce the corresponding parts, as well as different permanent retention systems, the two parts having to be assembled

  to give a unitary unit ready to use.

  The subject of the present invention is a structure of the

  ypée usmentionnê, carried out so as to confer an amélio-

  ration of flexibility between two plastic parts-

  tick, regardless of the material and by means of a manufacture

simple and inexpensive cation.

  According to the invention, this object is achieved by the fact that the articulated connection consists of an external cap-shaped element, formed on one of the plastic parts, as well as an internal element which is

  formed on the other plastic part and is embedded

  very at least partially in the external element; and by the fact that the two elements came from injection molding one inside the other, in a tool. This results in the advantage of simple and economical manufacture as a result of the use of a single tool in the articulation zone, the two plastic parts being joined together with mobility by means of this zone. of articulation. Because no connection taking the form of a hinge is established between the two plastic parts, there is no longer any risk of rupture advantageously to be feared at the point of rotation. In addition, the articulated connection according to the invention is not dependent on any material. It is ideally suited for hard materials. In addition, thanks to the loose connection between one and the other of the plastic parts, the articulated connection according to the invention makes it possible to obtain a

  rotation range up to 3600.

  Since the articulated connection in accordance with the invention

  tion is not dependent on any material, it is possible each time to use, especially for a two-component injection molding process, the best materials allowing good adhesion between the

first and second components.

  When the articulated connection according to the invention has to absorb greater forces, this is made possible, at all times, by a stronger dimensioning of the elements.

internal and external.

  According to other advantageous improvements of the invention

  tion: - the external element may have a peripheral zone of at least partially circular configuration in which the internal element, produced in the form of an ankle, is embedded at a distance; - A fracturable spacing member is preferably molded integrally between the two elements; the external element may include, at a distance from the circular peripheral zone, a notch which surrounds this zone;

  - the external and internal elements include advantageous-

  each time, two parts offset by 180;

  - the part considered of the external element is advantageous-

  delimited by extreme surfaces respectively

  flat and domed, while the considered part of the element

  internal ment is preferably made in the form of a tenon, with respectively convex and flat surfaces; - These respective parts of the internal and external elements advantageously extend to the center;

  - the external and internal elements may present an obvious

  dement in the center between the two parts respectively shifted

  lees of 180; - Preferably, the recess is delimited on the one hand, in the external element, by a flat surface located at a distance from the respective convex end surface, as well as by a surface disposed at right angles to said flat surface; and, on the other hand, by a perpendicular surface

  away from the surface of the external element which is

  see at right angles to the flat surface, as well as by a zone of attachment between the two parts of the internal element; - The external element preferably has a closed peripheral zone in which the internal element, produced in the form of an ankle, is embedded; and

  - the internal and external elements are advantageously im-

  planted, on the piece considered in plastic, by

  through a respective rib.

  The invention will now be described in more detail by way of non-limiting examples, with reference to the accompanying drawings in which: FIG. 1 is a side elevation of an articulated connection in accordance with the invention;

  Figure 2 is a front view with fragmented section

  keep quiet, representing the articulated link according to Figure 1; Figure 3 is a side elevation of another form of embodiment of the articulated connection;

  Figure 4 is a front view with vertical section

  wedge of the articulated connection according to Figure 3; Figure 5 is a side elevation of another possible embodiment of the articulated connection; Figure 6 is a front view with section of the articulated connection according to Figure 5; FIG. 7 shows, in front, an application of the articulated connection according to the invention, in a fixing element; Figure 8 is a front view, illustrating another possibility of embodiment of the articulated connection according to the invention; and Figure 9 is a fragmentary plan view of the

  articulated connection according to figure 8.

  Figure 1 schematically illustrates a plastic part 1, connected to a plastic part 2 via an articulated connection 3. This connection 3 consists of an external element 4 in the form of a cap formed on the one, 1, plastic parts, as well as an internal element 5 which is formed on the other part 2 and is embedded at least partially in said external element 4. The two elements 4 and 5 came from molding by

  injection into each other, from a tool.

  As can be seen, the external element 4 has a peripheral zone of at least partially circular configuration in which the internal element 5, produced in the form of an ankle, is embedded at a distance by reserving a

  spacer 7. A spacer 6 fractured

  ble is integrally molded between the two elements 4 and 5 and it is broken, when the assembly fulfills the function of an articulated connection, so that the internal ankle-shaped element can then perform articulated movements in the element external 4 made in the shape of a cap. It can then be provided in this element 4, in

  view of better synchronization of rotational properties

  tion, a notch 8 which surrounds the circular peripheral zone, of which it is equidistant. The internal element produced in the form of an ankle is connected, to the part 2 of plastic material, by means of a rib 25. In

  in this case, the thickness of this rib and the size of the opening

  ture of the external element 4, in the vicinity of said rib, determine the pivoting authorized by the articulated connection

according to the invention.

  In the exemplary embodiment according to FIGS. 3 and 4, an external element 4 ′ and an internal element 5 ′ each comprise two parts I and II offset by 1800. The

  considered part of the external element 4 ′ is then delimited

  ted by an extreme flat surface 9, as well as by a surface

extreme domed 10.

  As shown in Figure 4, the extremely

  me plane 9 is located respectively at the top and bottom in the parts considered I and II. Curved surfaces 10

  occupy a corresponding diagonal position in these parts

parts I and II.

  The considered part of the internal element 5 ′ is then produced in the form of a tenon, with a curved surface 11 and a flat surface 12. As again revealed in FIG. 4, the flat surface 12 is located at the top in Part I, so that it is located opposite the

  extreme flat surface 9 of the external element 4 '; in return

  che, the curved surface 11 of the internal element 5 ′ is facing

  with respect to the curved end surface 10 of this external element 4 '. The provision is corresponding in Part II. This results in a greater degree of freedom of the connection

  articulated according to the invention, due to the interca-

  areas between the respective surfaces 10-, 11 and 9, 12.

  In the exemplary embodiment according to FIG. 5, the internal and external elements have, in the center between the two parts I and II respectively offset by 180, a recess 13 and 14 emerging from FIG. 6. The respective recess 13 or 14 is then formed, in the external element, by a planar surface 15 located at a distance from the respective convex end surface 10, as well as by a surface 16 arranged at right angles to said planar surface;

  moreover, it is delimited by a surface 17 perpendicular to

  space at a distance from the surface 16 of the external element 4 ′, as well as by a joining zone 18 between the two parts of the internal element 5 ′ So it is clear

  that the respective recess 13 or 14 is delimited by the sur-

  faces 15 and 16 in the central region of the external element

  4 ', as well as by the surfaces 17 and the area of solidarisa-

  tion 18 of the internal element 5 'Thanks to this embodiment illustrated on the

  Figures 5 and 6, showing a widening of the structure

  According to Figures 3 and 4, an additional degree of freedom

  is given to the articulated connection according to the invention: the plastic part 2 can also perform movements in the axial direction, relative to the part 1, in accordance with the size of the recess

respective 13 or 14.

  Figure 7 illustrates the application of the link arti-

  abutment according to the invention, according to FIGS. 3 and 4.

  We choose in this case, as a starting point, a

  fastening element 19 comprising two shells 20 and 21.

  As regards the internal element 5 ′, the shell 21 is of an embodiment similar to that of the part 2 of plastic material shown in FIGS. 1 to 6; the external region (i.e. the external element 4 ') is housed

  in the bearing part of the fastening element 19, similar

  part 1 plastic part in the form of

  realization according to figures i to 6.

  The elements, both external 4 ′ and internal 5 ′, are of a design analogous to the structure according to FIGS. 3 and 4, that is to say that they include curved and flat surfaces. It can be seen that, thanks to this embodiment, the shell 21 can cover a large range of pivotings, if

  although it is more elastic in mobility than the shell

  the 20 fixed, to the corresponding bearing part, by means of

  medial of a film hinge not shown below

  tail. In this case, however, the possibility is also offered of placing the shell 20, on the bearing part.

  of the fastener 19, so-

  milaire to the articulated connection of the shell 21.

  Figures 8 and 9 show another possibility of

  realization of the articulated connection according to the invention.

  It can then be seen that an external element 4 "has a closed peripheral zone, formed by a ring 22. An internal element 5", produced in the form of a dowel, is embedded in this ring 22 by a stud 23. In accordance with the Figure 8, the stud 23 and the ring 22 are separated by a large intermediate space, which may however also be of a smaller dimension depending on the embodiment considered. The external element 4 "is installed on the plastic part 1 by means of a rib 24; the internal element 5" is, for its part, fixed to the plastic part 2

  through a rib 25.

  All the above-mentioned articulated links,

  forms of the invention, came from nested injection molding from a tool, in the articulation zone;

  the two plastic parts 1 and 2 are then

  linked to each other, with freedom of movement, in the corresponding articulation zone of the articulated connection 3. This articulated connection eliminates any risk of rupture at the point of rotation and, moreover, the realization of the

  articulated connection according to the invention is not advantageous-

dependent on any material.

  It goes without saying that many modifications can

  be made to the articulated connection described and represented

  without departing from the scope of the invention.

Claims (11)

  1. Articulated connection between two plastic parts, one of which can rotate at least partially relative to the other, connection characterized in that this articulated connection (3) consists of an external element (4; 4 ' ; 4 ") in the shape of a cap, formed on one (1) of the plastic parts, as well as an internal element   (5; 5 '; 5 ") which is formed on the other part (2) in ma-   plastic and is at least partially embedded in the external element; and by the fact that the two elements (4, 5; 4 ', 5'; 4 ", 5") came from injection molding one inside the other, in a tool.   2. Articulated connection according to claim 1, charac-   merited by the fact that the external element (4) has a peripheral zone of at least partially circular configuration in which the internal element (5), made in   ankle shape, is recessed at a distance.   3. Articulated connection according to claim 1 or 2,   characterized by the fact that a spacer (6) frac-   turable is molded integrally between the two elements (4, 5).   4. articulated connection according to claims 2 and 3,   characterized in that the external element (4) comprises,   away from the circular peripheral zone, a notch re (8) which surrounds this area.   5. Articulated connection according to claim 1, charac-   terrified by the fact that the external and internal elements (4 ′, 5 ′) each comprise two parts (I, II) offset by 180.   6. Articulated connection according to claim 5, charac-   terrified by the fact that the considered part of the external element (4 ') is delimited by planar and convex end surfaces (9, 10); and by the fact that the considered part of the internal element (5 ′) is produced in the form of a   tenon, with curved and flat surfaces (11, 12).   7. Joint articulated according to claims 5 and 6,   characterized in that the respective parts (I, II) of the internal and external elements (5 ', 4') extend to the center.   8. Joint articulated according to any one of the res-   dications 5 to 7, characterized in that the external and internal elements have a recess (13, 14) in the center   be between the two parts respectively offset by 180.   9. Articulated connection according to claim 8, charac-   confirmed by the fact that the recess (13, 14) is delimited on the one hand, in the external element (4 ′), by a flat surface (15) located at a distance from the respective convex end surface (10), as well as by a surface (16) arranged at right angles to said flat surface; and, on the other hand, by a surface (17i perpendicular to the surface (16) of the external element (4 '), as well as by a   joining area (18) between the two parts of the element internal ment (5 ').   10. Joint articulated according to claims i and   2, characterized in that the external element (4 ") pre-   feels a closed peripheral area in which the element   internal (5 "), made in the form of an ankle, is recessed.   11. Joint articulated according to any one of the res-   above, characterized in that the elements   internal and external elements are installed on the part   plastic (1, 2), via a respective rib (24, 25).