FR2798971A1 - ARRANGEMENT FOR FIXING A BUILT-IN ELEMENT IN A LOCATION OPENING OF A SUPPORT PLATE - Google Patents

Abstract

The fastening consists of a base (6), preferably of plastic, fitted to the underside of a component (2) by expanding dowels (14) in blind holes (43), and an anchoring element (29) with claws (30) to grip the underside of a panel (1) with an aperture to receive the component. The anchoring element is connected to the base by a screw (34) about which it can pivot, allowing the anchoring element to be turned away from the panel (1) to clear the edge of the aperture when it is inserted. After insertion the anchoring element is turned round so that its claws engage with the underside of the panel and the screw is tightened to fix it in place.

Description

The invention relates to an arrangement for fixing a built-in element.

  which can be mounted in the location opening of a support plate, rests by its edge on the upper face of the latter and can be fixed to it by at least one retaining device comprising a basic body to be fixed to the insert and a part articulated to this body and capable of engaging under the underside of the support plate, under the effect of a clamping pressure, the body comprising means for anchoring in

  holes made in the built-in element.

  In fastening arrangements of this type, which are known, screws are used as means capable of being anchored in the holes. This embodiment of the anchoring means complicates the mounting of the element

  built into the opening of the site.

  The object of the present invention is to propose a fixing arrangement which overcomes the disadvantage of

known arrangements.

  To achieve this object, the fixing arrangement according to the invention is characterized in that the anchoring means are produced in the form of projecting elements of the retaining device, which are capable of being anchored by deformation in the holes if applicable

blind.

  According to a characteristic of the invention, the projecting elements capable of being anchored in the blind holes are formed by expansion elements

  side inside the holes.

  According to another characteristic of the invention, an expansion element is produced in the form of a lug

  cylindrical hollow provided on said base body.

  According to another characteristic of the invention, an expansion lug comprises in its part to introduce into the hole a number of segments radially

separable from each other.

  According to another advantageous characteristic of the invention, the segments of the cylindrical expansion lug comprise on their internal face means in the form of a cam configured so that a spacer rod when it is inserted axially into the lug

  causes the segments to separate.

  The invention will be better understood, and other objects, advantages and characteristics thereof will appear

  more clearly on reading the description which follows

  of an embodiment of the structure according to

  the invention, this description being made with reference

  in the accompanying drawings, in which: - Figure 1 is a perspective view of a retaining device according to the invention, in its working position; - Figure 2 is a perspective view of the fixing device according to Figure 1, seen in the direction of arrow II of this Figure 1; - Figure 3 is a perspective view of the retaining device according to Figure 2, but shows it in a position in which the staple portion is separated; - Figure 4 is a side view of the retaining device according to Figures 1 and 2, in its position, for fixing a built-in element in a location opening of a support plate; - Figure 5 is a sectional view along the line V-V of Figure 4, with an expansion rivet not yet deformed and a deformed rivet; - Figure 6 is a perspective view and illustrates the mounting of a retaining device according to the invention on the inner face of a built-in sink-shaped element, and - Figures 7 and 8 are schematic views of '' an expanding rivet before and after the spacing operation. In the figures, reference numerals 1, 2 and 3 respectively denote a support plate, a built-in element bearing by its edge on the support plate and a retaining device according to the invention for fixing the built-in element to the support plate. The location opening in the plate 1, in which the built-in element is to be mounted, bears the reference 4. As is apparent in particular from FIGS. 1 and 2, the retaining device 3 comprises a base body 6 advantageously made of plastic material. The body comprises a substantially parallelepiped middle part and lateral flanges 8 which, as well as reinforcing elements 9 extending

  between the flanges and the middle part.

  The front faces 10 of the fixing flanges 8 form the front or front face of the base body. The middle part 7 is produced in the form of a hollow block which is open in the plane of its front face and is closed on its rear side by a bottom wall 12. A hollow cylindrical lug 14 projects from the front face 10 of each flange. The lugs are made in the form of expanding rivets. To this end, each lug is divided in the example represented by two axial notches 15, 16 diametrical and extending from the free end of the lug, into four segments 17 radially separable,

one another.

  Each lug segment or rivet 10 has on its internal face a cam in the form of a ramp 18 projecting progressively towards the axis of the lug, in the direction of the free end. With each rivet is associated a spacer rod 20 which projects from the rear face of the corresponding flange and is movable by passing through a hole in it, axially in the expansion rivet 14. During this movement, the end front of the rod slides on the ramp-shaped cams and pushes the ends of the rivet segments 14 radially outward against the wall of the

rivet receiving hole.

  The expansion rivets 14 are made so as to be made of material with the flanges 8. The spacer rods can also be made of material with the flanges but are only connected to these by thin

breakable link bars 19.

  At the parallelepiped central body is articulated at 23, at the rear face, a member in the form of a plate 22 which is pivotable between a position spaced from this rear face and a position in which it is applied against the latter, as this is shown in Figures 1 and 2. This plate is advantageously made of material with the base body and the joints are formed for example by two bars

flexible connection 23.

  The plate 22 carries a portion 25 forming an L-shaped clip made of metal in the present example. A branch 26 of the staple part is formed by two parallel bars whose ends are retained and movable, in the direction of the direction

  longitudinal, in recesses 28 of the plate 22.

  These recesses are located in the vicinity of the longitudinal edge of the plate 22, which extends parallel to the longitudinal edge which carries the articulation 23. The second free branch 29 is intended to come into engagement under the support plate in the working position of the retaining device and carries at its ends teeth 30 bent upwards, which can penetrate the underside of the plate

of support.

  The junction area 32 of the two branches 28, 29 is configured to be able to serve as a support for the head 33 of a screw 34, which crosses the branch 29, extends between the two bars of the branch 26 and is screwed into a threaded hole 36 in the plate 22 between the recesses 28. The threaded hole passes through the plate. In the pivoting state on the rear side of the base body 7, the recesses 28 and the threaded hole 36 are extended by the respective recesses 37 and 38 in this body. The recesses 37 and 38 pass through the thickness thereof, as is clearly shown in FIG. 2. The zone in which the recesses 37 and 38 open into the front face of the base body projects perpendicularly from the front face and is used for precise positioning of the base body on the underside of the built-in element. It can also be seen in the figure that the plate 22 carries on its side facing the base body elements in the form of hooks 44 which are lockable in recesses

  corresponding 45 in the bottom wall of the base body.

  Figure 5 shows how a restraint

  3 according to the invention is fixed to the built-in element 2.

  The retaining device is placed on a console 41 under the insert, by bringing the expanding rivets 14 into corresponding blind holes 43 made in the console. After the positioning of the retaining device, the spacer rods 20 are pushed axially into the rivets, by a blow on their free end, and separate the segments of rivets 17 so that the outer surfaces of these are pressed. against the inner walls of the holes. The blow on the rods causes the rupture of the thin connecting bars 19 by which the rods are connected to

mounting flanges 8.

  After anchoring the retaining devices under the built-in element, it is placed in the location opening 4, with the plate 22 which carries the staple part 25 tilted back. Then the plate 22 is brought to pivot into the working position shown in the figure in which it is

  in application to the inner face of the base body.

  Then using the screw the staple part is moved until its free branch 29 engages

under the support plate.

  In the embodiment described and shown, the base body and the plate of the retaining device are made of plastic and the staple part of metal. It is of course possible within the framework of the invention, to produce the assembly from the same material,

  for example in metal or plastic.

  It should be noted that the axes of the rivets and the receiving holes of the rivets may have a certain lateral offset to increase the pre-assembly and mounting forces and so that the tightening of the retaining device using the screw causes additional bending. of the base body (reduction of the offset

  axes), which increases the holding force.

Claims (10)

  1. Fixing arrangement for a built-in element, which can be mounted in the location opening of a support plate, rests by its free edge on the upper face of the latter and can be fixed to the support plate by a retaining device comprising a base body capable of being fixedly mounted on the insert element and a part articulated to the base body and capable of coming to bear under the underside of the support plate, the base body comprising means which can be anchored in holes (43) in the built-in element, characterized in that the anchoring means are formed by projecting elements (14), which are capable of penetrating into the holes (43) and to be   anchored in them by deformation.   2. Fastening arrangement according to claim 1, characterized in that a lug (14) capable of being anchored in a hole (43) is formed by a member lateral expansion in the hole.   3. Fastening arrangement according to claim 2, characterized in that the expansion member (14) is produced in the form of a hollow cylindrical lug coming from   advantageously of material with the base body (6).   4. Fastening arrangement according to claim 3, characterized in that the axes of the expansion lugs (14) and the axes of the holes (43) have a lateral offset to facilitate pre-assembly of the device.   retained under the insert.   5. Fixing arrangement according to one of   claims 3 or 4, characterized in that the lug   expansion (14) is produced in the form of an expansion rivet have segments with radial spacing (17), and in that with the expansion rivet is associated a spacer rod (20) which is axially displaceable in the rivet expanding to cause the rivet to expand by spacing of the segments.   6. Fastening arrangement according to the fastening 5, characterized in that the aforementioned segments (17) of the expansion rivet have on the internal faces of the cams in the form of ramps so as to produce, cooperating with the spacer rod (20 ), the spreading effect during   the introduction of the rod into the rivet.   7. Fixing arrangement according to one of   claims 5 to 6, characterized in that the rivets   expansion (14) protrude from the front face of flanges (9) for fixing the base body (6) of the retaining device (3) for fixing to the built-in element, and in that the spacing rods ( 20) protrude from the rear face of the fixing flanges being in axial alignment with the rivets and are capable of being introduced into the rivets through a hole crossing the flanges.   8. Fixing arrangement according to one of   Claims 4 to 6, characterized in that the rivets   expansion (14) come in one piece with the flanges of fixing (8).   9. Fastening arrangement according to claim 8, characterized in that the spacer rods are connected to the fastening flanges (8) by connecting bars breakable (19).   10. Fastening arrangement according to claim 8, characterized in that the connecting bars (19) are made in one piece with the flanges (9) and the spacers.