FR2653378A1 - LINK BETWEEN FRICTION WELDED ELEMENTS AND A SURFACE. - Google Patents

Abstract

The connection between friction welded elements and a surface, in particular between a support pin, provided with a flange, and the wall of a container for refrigerated materials, is made in such a way that the pin (13) crosses the wall ( 10) of the container through a hole (12) and is applied with its flange (14) from the outside against the wall (10) of the container.

Description

The invention relates to a connection between friction welded elements and

  a surface, in particular between a support pin, provided with a collar, and the wall of a container for refrigerated materials

  in a refrigerator or the like.

  Friction welding connections of the cited type are used

  tually established by the fact that the friction welded member, which is clamped in a mandrel or other driving device

  and rotated around its axis, is applied with its collar

  flange against the fixing location on the wall. The warmth of

  friction then developed temporarily softens, in their place

  contact elements, the elements to be connected in such a way that after the connection location has cooled, occurring during

  shutdown, the desired solid and tight connection is obtained.

  However, the method used for known friction welding connections has the disadvantage that the elements easily start to "float" at the contact location, due to the softening occurring during rotation, and undergo this.

made a merger.

  Therefore, precautionary measures must be taken

  to prevent the fusion of the two elements to be

  interconnected, and to obtain a fixation with exact dimensions.

  In addition, during the assembly of the two elements according to the known method, softened material runs the risk of flowing under the edge of the flange and of forming a weld track strongly altering the appearance of the connection. Another disadvantage of the known method lies in the fact that, due to the relatively large diameter of its flange, necessary to obtain sufficient stability of

  the connection location, and also due to the smaller dimensions

  large time share of devices applying the necessary torque,

  the fixing element cannot be mounted at different angles

  wall access lashes. Likewise, it is difficult to fix

  friction welded components in areas without over-

  flat and smooth face. Finally, another drawback resides in the fact that, due to the need, linked to known methods, to place the element welded by friction in a mandrel or in another transmission device, traces and marks remain on the surface of the friction welded element, the appearance of which is thus substantially altered in an undesired manner.

  The present invention therefore aims to improve

  ner and make friction welding connections so

  such as the many disadvantages mentioned at the outset, which appear

  when applying known methods, be avoided from

simple way.

  According to the present invention, this object is achieved by the fact that the pin passes through the wall of the container through a hole and is applied with its collar from the outside against the wall of the container. The exact guiding of the trunnion, guaranteed by the edge of the hole, makes it much easier to mount the trunnion to exact dimensions. Of

  more, we obtain that weld tracks, which could appear

  grate at the edge of the collar, are outside the visible area and that marks on the visible part of the friction welded element are avoided. Finally, the embodiment, in accordance with the invention, of the connection makes it possible to have friction welded elements also in angles which are difficult to access or at places where deformations are found, on a visible face, of

  the wall prevents perfect application of the collar.

  According to an advantageous embodiment of the invention, it is provided that the pin has a cavity which is located in its axis, is open towards the flange and in which a tool,

  transmitting torque, can be inserted by tightening.

  This advantageous embodiment of the journal makes it possible to

  prime chucks or other bulky devices for applying torque and use narrow tools instead, such as a hex wrench or a slotted screwdriver blade

or with cross slits.

  According to another embodiment of the object of the invention, it can however be provided that the flange is equipped with means for applying a torque acting around the axis

of the journal.

  Here it is possible to equip the flange with a pin

  suitable or housing, arranged in the surface of the col-

  rim, perpendicular to its axis, to receive a correct tool

  respondent intended to apply the torque.

  According to another advantageous embodiment of the invention

  it is expected that the pin is surrounded in its connecting part

  with the collar, an annular hollow.

  The annular recess in the collar is able to receive

  see excessively softened material, before it can escape under the outer edge of the flange and penetrate outward. Finally, according to another advantageous embodiment of the invention, it can be provided that the pin has, in the zone of connection with the flange, a radius of connection which is greater than the radius of connection at the outlet, associated with

  the flange, from the hole in the wall of the container.

  The softening effect obtained precisely at the outlet of the hole makes it possible to establish a particularly tight connection in the

hole area.

  The invention is explained in the description below at

  using examples of how to make connections between elements under-

  friction dice and a surface, which are illustrated

  folded by the attached drawing, in which FIG. 1 represents an enlargement partially in

  section of a connection between a surface and a welded element

  tion which crosses the surface with a pin and is applied with a flange against this surface, and Figure 2 shows approximately in full size in detail an upper corner of the body of a refrigerator, with a friction welded element, which is on the wall of the container

inside the refrigerator.

  In the connection, shown in FIG. 1, between a friction welded element and a surface, the reference 10 designates the wall of a container, for example the wall of the interior container of a

  refrigeration appliance, on which an element 11 is fixed by support

  friction friction. To this end, the wall 10 made from a thermoplastic material is provided with a hole 12 which is traversed by a pin 13 of the friction welded element 11 which is also constituted by a thermoplastic material. The end of the pin 13, associated with the wall 10 of the container, is provided with a flange 14 which is applied from the outside against the wall 10 of the container. The pin 13 is provided with a cavity 15 which is located in its axis, is open towards the flange 14 and which is produced,

  in the embodiment shown, with hexagon socket in the-

  which a tool in the form of a hexagon spindle, not shown, transmitting a torque, can be inserted by tightening. In its connection part towards the flange 14, the pin 13 is surrounded by an annular recess 16 serving to receive excessively softened material which, during the friction welding operation, comes out between the surfaces covered by the flange 14. In the example of

  embodiment shown, the flange 14 is provided, on its outer face

  superior, of a shoulder 17 in the form of a step.

  The element 11 friction welded, shown in Figure 2

  in relation to the body 18 of a refrigerator, has a structure

  ture similar to that of FIG. 1. Consequently, identical parts have the same references. Unlike the embodiment according to FIG. 1, the wall 10 ′, curved in the upper corner area, of the container inside the bodywork is shown here, instead of a flat container wall. 18 of the refrigeration unit. We can see here that due to its special fixing mode, in which the flange is on the outside, the friction welded element can be fixed so

  safe to container even in this partial upper corner area-

slightly curved.

  As a variant of the embodiment shown and described, it is also possible to provide for the collar to be produced on its external face with corresponding devices for applying a torque. Outside the aforementioned journal, which projects rearwards from the flange and is produced under

  form of coach, it is possible to make the collar itself

  even in the form of a prism with several angles. It is also possible to provide that the flange is made with recesses, holes or teeth, open towards its outer face, in which can

  be centered a tool, realized in a corresponding way, to apply

a couple.

  1. Connection between friction welded elements and an over-

  face, in particular between a support pin, provided with a collar, and the wall of a container for refrigerated or similar materials, characterized in that the pin (13) passes through the wall (10) of the container by a hole (12) and is applied with its

  collar (14) from the outside against the wall (10) of the container.

  2. Connection according to claim 1, characterized in that the pin (13) is provided with a cavity (15) which is located in its axis, is open towards the flange (14) and in which a

  tool, transmitting torque, can be inserted by tightening.

  3. Connection according to claim 1, characterized in that the collar (14) is provided with means for applying a

  torque acting around the axis of the journal (13).

  4. Connection according to any one of claims 1 to 3,

  characterized in that the pin (13) is surrounded, in its part of connection with the collar (14), by an annular recess (16).

  5. Connection according to any one of claims 1 to 4,

  characterized in that the pin (13) has, in the

  connection area with the flange (14), a connection radius

  which is greater than the radius of connection to the outlet, asso-

  attached to the flange (14), of the hole (12) of the wall (10) of the

container.