FR2556768A1 - PIVOTING OR HINGED SUPPORT DEVICE WITH SIDE MOUNTING AND BALANCING SPRING FOR HOOD OR COVER - Google Patents

Abstract

LATERAL MOUNTED HINGED OR SWIVEL SUPPORT DEVICE FOR A HOOD CONSISTING OF A MOBILE PART 1 COUPLED TO A SIDE SKIRT 50 OF THE COVER 5, A FIXED PART 30, 31 CONSISTS OF A HEAD 31 AND A BRACKET 30 MOUNTED ON THE HOUSING TO BE COVERED BY THE HOOD 5. THE MOBILE PART 1 IN THE SHAPE OF A FLANGE INCLUDES A CENTRAL PROJECT 12 WITH A WIDERED END 18, WHICH AFTER HAVING GOES THROUGH A HOLE 51 OF THE SKIRT 50 ENTERING A HOLLOW BEARING 35 OF THE FIXED PART 31. CYLINDRICAL CENTRAL PROJECT 12 PROVIDED WITH A DIAMETRAL SLOT 19 ALLOWING ITS WIDERED END 18 TO GO THROUGH THE BEARING 35, WHICH EMERGING FROM THE OPPOSITE SIDE OF THE BEARING 35 ENSURES A ROTATING ENGAGEMENT BY SNAP BETWEEN THE 30-31 AND FIXED PARTS 30-31 1.

Description

l

  PIVOTING OR HINGED SUPPORT DEVICE

  WITH SIDE MOUNTING AND BALANCING SPRING

FOR HOOD OR LID

  The invention relates to support devices of the char-

  side mounting mounts for hood or cover pivoting about a horizontal axis close to its rear end, each comprising a spring calibrated so as to balance, whatever its orientation, the weight of the hood in overhang with respect to this axis. Such hinges with balancing by helical torsion spring are generally respectively mounted on opposite side walls, vertically oriented from the skirt of a cover. They each comprise a cup-shaped head with a cylindrical side wall, integral with a fixing lug which can be mounted on the opposite side walls of the housing containing the device to be covered by the pivotable cover. Such an apparatus is, for example, constituted by a disc player with horizontal turntable which must be made accessible in particular for the installation or removal of the

  i5 record-bearing disc, by opening the pivoting cover.

  The head of a known type of hinge is composed of a cylindrical side wall, closed on one of its sides by a flat bottom in the form of a disc provided with a central opening. This central opening serves to accommodate a cantilevered axis so that it cannot move axially. To this end, it includes at one of its ends, a shoulder which is applied against the outer face of the flat bottom. A cylinder is fitted on the axis and made integral with it by gluing, crimping, riveting or overmolding, for example, so that one of its ends is applied against the inner face of this base which is thus clamped on both sides. The other end of the cylinder integral with the axis, is integral with a circular disc which is normal to the latter and the face opposite to the bottom of the head is located in the plane of the edge of the side wall thereof . Between the respective inner faces of the latter, of the bottom and of the disc, and the surface of the cylinder fitted on the axis, an annular cavity is provided, making it possible to accommodate a torsion spring of helicoidal shape, for example. That of the ends of the spring which is in the vicinity of the bottom is folded so as to have a radial end which allows its anchoring by insertion into an opening made in the side wall of the head. The other end of the spring is folded back so as to form an axial end which fits into a hole made in the circumference of the disc. It will be noted here that the directions of winding of the spring of the hinge on one side (left) must be reversed with respect to that of the hinge on the other side (right), so that the two hinges respectively located opposite sides of the device, with their disks polarized by the springs, turned outwards and joined together through the cover, can rotate it in the same direction. The pivoting movement of each of the hinges is limited by two stops so that the possible pivoting angle is 90 degrees (i.e. between horizontal positions

hood vertical).

  The disc is provided on its periphery with four cylindrical projections

  bricks or pawns which are located symmetrically to the axis of pivo-

  tement, of which two diametrically opposite are pierced with central holes for anchoring the axial end of the spring and two others of which are provided with tapped holes which allow them to receive the fixing screws of the cover. The rear part of the cover is pierced with four holes which allow the insertion of these pins whose height is at most equal to the thickness of the cover. The mounting of the hinges on the cover is carried out using a disc-shaped flange whose diameter is substantially equal to that of the cylindrical head and which is pierced by two diametrically opposite holes which allow the passage of two screws respectively. towards the threaded pins, engaged in two of the holes in the cover. Tightening these screws tightens the rear of each side wall of the cover between the faces

  opposite the pivoting disc and the flange.

  In a hinge of the prior art described above, the fixing lug and the head which are integral, their edges, projections and holes are produced in one piece by cutting and stamping a thick metal sheet (1 , 5 - 2mm). The axle with its shoulder and the spring are also made of metal. The integral assembly of the cylinder and the disc as well as the flange are, for example, produced by molding of plastic materials. The mounting of the disc on the axis after the insertion of this one in the central opening of the bottom of the head with the spring already placed, anchored and tensioned in the annular cavity, is a relatively complex operation requiring sophisticated tools and / or automated, so that

  its manufacturing must be carried out in large series to be profitable.

  In addition, two screws are required to mount the cover.

  and flange on the disc. These screws can be tapping and the -

  pins in which they are screwed can be drilled without thread

  interior to achieve low savings.

  The hinge, object of the present invention, allows significant savings in labor, during its manufacture, on the one hand, and during its assembly, on the other hand. While performing the same functions as that of the prior art, it is only composed of three parts of which only the spring is metallic, the axis, the disc, the flange and its fixing hub constituting only a single piece of plastic material obtained by molding. Its volume being substantially the same as that of the conventional hinge described above, its weight is notably,

  lower while ensuring rigidity and mechanical resistance

satisfactory nics.

  According to the invention, a pivoting or loading support device

  side mounting for cover or cover, one of which is mounted on each side of the appliance or of the housing that it is intended to cover, in the vicinity of its rear edge and in such a way that the pivot axis of the cover either parallel to the latter, each of the devices or hinges comprising a fixed part, a movable part enclosing between them a side skirt of the cover or cover, provided with holes intended for the passage of the connecting elements between the different parts, is mainly characterized in that that the fixed part comprises a hollow cylindrical bearing, of determined length and diameter, the axis of which is normal to the skirt and in that the movable part has a substantially cylindrical central projection passing through the skirt via a hole as well as the landing, and

  comprising at the end enlargements with rounded or truncated ends

  çonique on its diametrically opposite sides and a slit oriented perpendicular to these enlargements in order to facilitate their passage through the bearing from which they emerge on the other side by ensuring therein a pivoting connection between the movable and fixed parts by snap-fastening.

  The invention will be better understood and others of its characteristics.

  ristics and advantages will emerge from the description which follows and from

  accompanying drawings, given by way of example, on the

  which: - Figure 1 is a plan view of the inner side of a flange covering a side wall of the skirt of a hood or cover, - Figure 2 is a section along AA of the flange of Figure 1; - Figure 3 is a section along BB of this flange; - Figures 4 and 5 show in perspective the torsion springs intended for balancing the weight of the cover or pivoting cover, fitted respectively to the left and right hinges; - Figure 6 is a plan view of the side facing outwards of the fixed part of a left hinge according to the invention, composed of the head and the integral lug; - Figure 7 is a section along CC of the fixed part of Figure 6; - Figure 8 is a sectional view cut away along the curve DD of the fixed part of the hinge of Figure 6; - Figure 9 is a cutaway view, similar to Figure 8, of the fixed part of a straight carrier; - Figure 10 is a partial sectional view in elevation (vertical) of an assembly of the three parts of a left hinge with the left side wall of a cover or cover with skirt; and - Figure 11 is a partial horizontal section (according to EE of

Figure 10) of such an assembly.

  In all the figures, the same references are used to

designate the same elements.

  In FIGS. 1, 2 and 3, there is shown respectively in plan and in section along AA and BB, a flange or circular flat disc 1 constituting the part of the lateral hinge which is mounted at

  the outside of the skirt. It includes an exterior face 10 sensi-

  completely flat and an equally flat inner face II and provided with three projections (or pins), normally oriented 12, 13 and 14 and integral, the first 12 of which is located centrally and the other two of which 13 and 14 are respectively arranged on the sides

  diametrically opposed to the first 12.

  The first projection 12 or pin, substantially in the form of a cylindrical rod, is located in the middle (center) of the internal face 11 of the disc. It is composed of a first cylindrical part 15 of predetermined diameter, followed by a second part 15, which serves as a pivot axis for the flange 1 and which is terminated by an enlargement

  in the shape of a head 17 whose face facing the disc is radial.

  The opposite face of this head forms a tip 18 which shrinks

  cit, rounded or sectional.

  The end 18 and the second cylindrical part 16 are separated in two by a diametrical slot 19 over a major part of the height of the latter 16 so as to allow the elastic bending of the two parts thus separated towards one another. This deflection allows, during assembly of the hinge, to penetrate the enlarged end 18 of the second cylindrical part 16 in

  a hollow bearing whose internal diameter is at most only slight

  considerably greater than the outside diameter of the latter.

  It will be noted here that the enlarged end 18 has in the direction of the slot 19, substantially the same dimension as the diameter of the second cylindrical part 16 of the projection 12 or that the internal diameter of the bearing which it must pass right through. , and in the direction normal to this slot 19, a dimension which is at most equal to the sum of this diameter and the width of the latter, and

  substantially equal to the diameter of the first cylindrical part 15.

  The second projection 13 (or pin) shown above between the center and the edge of the inner face 11 of the disc 1, is of cylindrical shape and height at most equal to the thickness of the skirt of the cover or cover (not shown ), which is also the case with regard to the first cylindrical part 15 of the first projection 12, the diameter of which is at least equal to the largest radial dimension of the enlarged head 17. This second projection 13

  cooperates with the first 12, central by penetrating during the as-

  semblance of the hinge, respectively in two openings of the side skirt of the cover which have been made therein for this purpose, in order to make this skirt substantially fixed relative to the flange or disc I. The third projection 14 (or pin) has a section , for example, substantially oval or elliptical (or even rectangular), with its major axis oriented radially and a height significantly greater than the thickness of the side skirt of the cover to emerge from the interior. It (14) is provided with a groove or slot 140 in the form of an arc of a circle, the center of which is located on the common geometric axis of the disc 1 and of the central projection 12 and in the middle of this groove 140 with a circular opening 141 parallel to this axis and which passes through it substantially right through. The depth of this groove is preferably chosen to be less than the difference between the height of the projection 14 and the thickness of the skirt, so that its bottom is situated slightly towards the outside of the internal face.

  of it, when the hinge is mounted on it.

  This third projection 14 serves, on the one hand, for anchoring or fixing one end of a torsion spring described below and, on the other hand, as a stop which can determine the limits of pivoting.

of the hood.

  Note also that to rotate the cover at the same time as the flange 1, it suffices, in addition to the central projection 12 forming an axis, a single eccentric projection that can exercise multiple functions, such as the third projection 14 (or stud). So we can

  omit the second projection 13 which is diametrically opposite to it.

  FIGS. 4 and 5 represent substantially in perspective, respectively, springs for balancing the weight of the hood 2G, 2D which serve to maintain it in any position between the horizontal (closed) and one close to the vertical (70- 80 relative to the horizontal, open) which allows access to the surface it

overlaps in the first.

  FIG. 4 shows a torsion spring 2G intended to equip the left hinge and comprising a central part of helical shape 20 whose inner end is extended by a radial fold 23 whose function will be explained later. The other (outer) end of the spring 20 is extended by a fold in the axial direction 22 which is inserted into the hole 141 of the third pin 14 of the flange 1, which serves as an anchoring point. The end of the helical part 20 which follows this axial fold 22 takes place in the groove 140 in an arc, so as to limit the pivoting of the spring 2G around the axis defined by this hole 141. The spring 2G is shown there relaxed and its tension is obtained by moving the end

  of its radial fold 23 in a clockwise direction.

  FIG. 5 shows a 2D balancing spring for a straight hinge whose helical part 21 is wound in the

  opposite direction to that of the left spring 2G. Its outer end

  also includes an axial fold 22 for insertion into the hole 140 of the projection 14 of a flange 1 and its inner end

  includes a radial fold 23 allowing it to be stretched after the as-

  pretense. In FIGS. 4 and 5, the radial 23 and axial 22 folds of the spring 20 or 21 are located on the same sides thereof,

  such that it includes a whole number of turns.

  Figures 6 and 7 are respectively a side view of the exterior and a section in elevation (according to CC) seen from the rear,

  the fixed part of a left hinge according to the invention.

  The fixed part 3G of the hinge of FIGS. 6 and 7 comprises an elongated rectangular tab 30, provided with two normal flanges 301, 302 facing outwards, the tabs 30 being held in the base by simple insertion so as to allow disassembly and rapid reassembly of the cover by the user. The depth of the insertion of the tab 30 into this base (not shown) is limited by a stop 305 which constitutes the bottom of a projecting rib 306 substantially in the shape of a "U". The top of the tab 30 is integral

  a cup-shaped head 31 which includes an outer wall

  cylindrical upper part 32 closed towards the inside of a flat bottom 33 in the form of a washer or ring, carrying in its center a cylindrical cavity 34 extended by a hollow bearing 35 whose free end is flush with the plane defined by the edge of the wall 32. The transition between the cylindrical bearing 35 and the cavity 34, the diameter of which is appreciably greater, consists of a radial surface 36 which, during the assembly of the head 31 with the flange 1 allows the engagement of the head widened 17-18 from its central projection 12 by

  snap-on (see below and figure 11).

  More specifically, during the insertion of the rounded end 18 of the enlarged head into the free end of the hole formed by the bearing 35, the two central protrusion parts 15 separated by the slot 19 approach each other and penetrate inside the bearing 35 under the effect of a thrust exerted on the flat face 10 of the flange 1, until the widening 17 arrives at the level of the radial bottom 36 of the cavity 34. At this instant the two parts separated by the slot 19 move away from each other and the radial face 17 of the enlarged head rests on that of the radial bottom 36 of the cavity 34. Therefore, the head 31 of the part fixed is rotatably joined with the

flange 1.

  The common external face 38 of the cavity 34 and of the bearing 35

  which is cylindrical, is surrounded by a cylindrical skirt 39 sensi-

  completely the same height, one end of which is integral with the flat bottom 33 of the head 31. This skirt 39 is provided with a cutout 40 in

  niche shape over a little over a quarter of its circumference.

  One 41 of the edges of the cutout is located substantially in the extension of the longitudinal axis of the tab 30, while the other edge 42 is located slightly above a plane normal to this axis and passing through the common axis of the cavity 34 and of the bearing 35. The depth of the slot cutout 40 is slightly greater than the difference between the height of the third projection 14 and the thickness of the side wall of the cover, so that the edges 41 and 42 can act as stops by coming into contact with this projection 14. The space provided between the outer face of the skirt 39 and the inner face of the side wall 32 of the cup or head 31, is intended to receive a helical balancing spring (2G,

Figure 4, or 2D, Figure 5).

  The junction between the side wall 32 and the flat bottom 33 of the cup 31 is interrupted over a part of its circumference between one third and half of it, by a circumferential slot 43 which makes it possible to tension the spring 20 or 21 (figures 4

  or 5) by its radial end 23 whose end emerges from the head 31.

  This slot 43 has been shown more clearly and in detail in the sectional views, partially broken away, of FIGS. 8 and 9. Because of the presence of this slot 43 separating the bottom 33 from the side wall 32, the latter is also joined to the skirt 40 by means of three radial reinforcing ribs 44, on the part not

occupied by this slot 43.

  Figures 8 and 9 are sectional and cutaway views along DD of the respective fixed parts of the left 3G and right hinges.

  3D, to illustrate the shape of slots 43G and 43D.

  The end of the slots 43G and 43D which is oriented towards the rear of the case or frame (not shown) to be covered with the pivoting cover, is provided with an axial extension or parallel to the generator 45 which is located in the vicinity of the junction of the rear edge of the tab 30 with the wall 32 of the cup and which is intended to accommodate the radial fold (23) of the spring (20 or 21), during assembly. The other end of the slot 43 which faces forward, is provided with an angled extension composed of a radial part 46 and a short circumferential part 47 which is parallel to the slot 43 itself, so as to form a kind of inverted "L". When the spring (20 or 21) has been tensioned, the end of

  its radial fold 23 is retained by the bottom of the circumferential part

  ferential 47 on which it is then based. The height of the radial reinforcing ribs 44 is chosen to be substantially equal to that of the inner edge of the circumferential part 47 housing the radial fold.

  of the spring (20 or 21) whose inner coil is supported there.

  FIG. 10 shows a partial section in elevation of the hinge assembled with the side wall of the cover in horizontal position (closed) and FIG. 11 shows a section along EE of the

  Figure 10 (which it is a section along FF of Figure 11).

  In FIG. 10, the flange I has not been cut and we see there only its flat disc-shaped part with its central projection 12, the first cylindrical part 15 of which passes through a hole 51 in the side wall 50 of the cover. 5 and whose second cylindrical part 16 constitutes the pivot axis which can rotate in the bearing 35 of the fixed part or head 31. It can also be seen there that the head or the enlarged end 17-18 of the central part 16 ensures the assembly of the flange 1 with the head 31 of the fixed part, by its engagement with the bottom

  flat (radial) of the central cavity 34.

  In FIG. 11, it can be seen that the two diametrically opposite pins or studs 13 and 14 of the flange I engage respectively in holes 52 and 53 passing through the side wall 50 of the cover 5, so as to anchor that this compared to that one. We can also see the insertion of the axial fold 22 of the spring 20 in the hole 141 of the third stud 14, as well as that of its radial fold in the inverted circumferential part 47 of the other end of

the 43G slot.

  Of the three constituent parts of the lateral hinge equi-

  released by torsion spring, only the latter is metallic, i.e.

  say steel. The other two parts, i.e. the flange I and the

  fixed part 3 comprising the tab 30 and the head 31, are respectively

  obtained by molding, for example, from a plastic material loaded with glass fibers, such as polyamide (6-6) with a load of 20 percent glass fibers, which provides mechanical rigidity and sufficient elasticity for the 'snap of the parts and the support of a hood or relatively heavy cover in a transparent acrylic resin, for example. A hinge produced in accordance with the invention comprises a minimum of components (three), is easy to produce, as well as to assemble. Consequently, it constitutes a significant saving compared to those of the state of the art. Another advantage is constituted by the fact that during assembly of the hinge, the spring is not tensioned and does not require complicated tools to join the fixed part to the

rotating part.

Claims (16)

  1. Swivel support device or hinge with lateral mounting for hood or cover (5), one of which is mounted on each side of the base, of the device or of the box that it is intended to cover, near its edge rear and in such a way that the pivot axis of the cover is parallel to the latter, each of the devices or hinges comprising a fixed part (30-31) and a mobile part (1) enclosing between them a side skirt (50) of the hood or cover (5), provided with holes intended for the passage of the connecting elements between the different parts, characterized in that the fixed part (30, 31) comprises a hollow cylindrical bearing (35), of determined length and diameter, whose axis is normal to the skirt (50) and in that the movable part (1) comprises a central projection (12), substantially cylindrical, passing through the skirt (50) via a hole (51) and the bearing (35) and comprising at the end widenings (17-18) with rounded or sectional end, on s es   diametrically opposite sides and a slot (19) oriented perpetually   specifically to these enlargements (17-18) in order to facilitate their passage through the bearing (35) from which they emerge on the other side, in   ensuring a pivoting connection between the movable (1) and fixed parts. (30, 31), by snap-fastening.   2. A pivoting or hinge support device according to claim 1, characterized in that the movable part (1) comprises at least one other projection (14) parallel to and eccentric with respect to the central projection (12), which passes through the skirt (50) by another hole (53) located at the rear of that (51) ensuring passage to the central projection (12) forming an axis, this other projection (14) serving to make   simultaneous pivoting of the movable part (1) and the cover (5).   3. Swivel support device or hinge according to the   claim 2, characterized in that the fixed part (30, 31) comprises   carries a hollow cylindrical skirt (39) surrounding the bearing (35) and integral with it and in that this skirt (39) has a slot cutout (40) whose edges (41, 42) cooperate with each other projection (14) whose end emerges through the skirt (50) to form stops limiting the pivoting of the movable part (1) and   of the cover (5) at about a quarter turn.   4. Swivel support device or hinge according to one of   previous claims, characterized in that it comprises a   torsion spring (20, 21) which is anchored by one of its ends (22) on the movable part (1) and by the other of its ends on the fixed part (30, 31) and which is arranged to so as to surround the landing (35) and / or the skirt (39).   5. A pivoting or hinge support device according to claim 4, characterized in that the spring (20, 21) has at its outer end an axial fold (22) which is inserted in a hole (141) made substantially in the center of the '' another projection (14), when of its assembly.   6. Swivel support device or hinge according to one of   Claims 2 to 5, characterized in that the end of the bearing (35)   opposite to that coming into contact with the skirt (50) is integral with the bottom (36) of a coaxial cylindrical cavity (34) which terminates in a radial wall extending outwards and forming a normal annular bottom (33) to the pivot axis, and the periphery of which is integral   a cylindrical side wall (32).   7. A pivoting or hinge support device according to claim 6, characterized in that the junction between the edge of the   annular bottom (33) and the cylindrical side wall (32) is inter-   ruptured over at least a third of its circumference to form a slot (43) leaving passage to a radial fold (23) outwards, located at the other end of the spring (20, 21), the end of which emerges from the slot (43) and allows the insertion of the radial fold (23) at the bottom of an extension of the inverted "L" shaped slot (46, 47), in order to tension the spring (20, 21).   8. Swivel support device or hinge with lateral mounting for hood or cover (5) of the balancing spring type (2G, 2D) of the latter, making it possible to maintain it in a position   any intermediary between two predefined extreme positions   completed, consisting of a fixed part (30, 31) fixedly mounted on the element   ment covered by this cover (5), with a movable part (1) pivotally mounted on the fixed part (30, 31) and with a torsion spring (20, 21) whose ends (22, 23) are respectively anchored on the movable (1) and fixed (30, 31) parts so that the pretended spring (20, 21) relaxes with the opening of the cover (5), the movable part (1) comprising a flange disc-shaped, the internal face (11) of which rests against the external face of the lateral skirt (50) of the latter (5), characterized in that the fixed part (30) comprises a hollow bearing (35) of determined length, the respective ends of which are constituted by radial surfaces (36) and in that the internal face (11) of the flange (1) comprises at least two projections (12, 14) one of which (12) is central and successively comprises a first cylindrical part (15) whose length is at most equal to the thickness of the skirt (50) of the cover (5) in which it passes through a hole (51), a second part e cylindrical (16) coaxial with and as an extension of the first (15), the outside diameter of which is at most substantially equal to the inside diameter of the bearing (35) and the length of which is substantially equal to that of the latter (35), and a tip widened in two diametrically opposite directions, composed of an abrupt transition (17) substantially radial and a head (18) of gradually narrowing shape, the tip (18) and the second part (16) being separated in two by means of a   diametral slot (19) of sufficient width to allow insertion   setting of the end (18) widened in the bearing (35), so that it can, emerging from the other side of the bearing (35), and moving away, ensure the snap-fastening of the movable part (1 ) in the fixed part (30), the second cylindrical part (15) then being able to rotate in the bearing (35).   9. Device or hinge according to claim 8, character-   laughed in that the other projection (14) or pin integral with the flange (1) in an eccentric position, is intended to penetrate into another hole (53) of the skirt (50) of the hood (5), in order to subject the flange (1) to this   skirt (50) for their simultaneous pivoting.   10. Device or hinge according to claim 9, charac-   terized in that the torsion spring (20,21) is of helical shape and has at one of its ends a fold parallel to its axis   (22) and at the other end a radial fold (23), oriented towards the outside laughing.   11. Device or hinge according to claim 10, charac-   terized in that the other projection (14), of a length greater than the thickness of the skirt (50) comprises a hole (141) parallel to the axis of the   flange (1), into which the axial fold (22) of the spring (20, 21) is inserted.   12. Device or hinge according to any one of the res-   dications 10 and 11, characterized in that the inner end of the bearing (35) of the fixed part (30, 31) constitutes the bottom (36) of a cylindrical cavity (34) of diameter greater than the maximum width of the end enlarged (18), the other end of which is integral with a flat annular bottom (33) whose outer edge is at least over part of its circumference secured to a cylindrical side wall (32), coaxial with and oriented in the same direction as the bearing (35), so that its edge as well as the free end of the latter comes into contact with the internal face of the skirt (50) and contributes to   keeping it pressed against the flange (1).   13. Device or hinge according to claim 12, charac-   terized in that the mechanical connection between the side wall (32) and the flat bottom (33) of the fixed part (30, 31) is interrupted over a length substantially between one third and half of its circumference to provide a slot (43) of sufficient width   for the passage of the radial fold (23) extending the interior end   lower of the spring (20, 21), the displacement of which forwards and the insertion into a re-entrant extension (47) of the slot (43), ensures its tensioning.   14. Device or hinge according to any one of the res-   dications 12 and 13, characterized in that the fixed part (30, 31) comprises, disposed between the common cylindrical outer face (38) of the bearing (35) and of the cavity (34) and the inner face of the side wall ( 32), a cylindrical skirt (39) substantially the same height as the latter and provided with a slot cutout (40) of sufficient depth to allow passage to the other eccentric projection (14) and in that the two edges (41, 42) opposite this cutout (40) cooperate with the latter (14) to serve as a stop limiting the pivoting of the movable part (1) relative to the fixed part   (30, 31) about a quarter of a turn.   15. Device or hinge according to any one of the res-   dications 12 to 14, characterized in that the cylindrical side wall (32) is integral, near its edge, with a fixing lug   (30) elongated rectangular, normal to its pivot axis.   16. Apparatus comprising a housing or a base, the top of which is covered with a pivoting cover (5) provided with two parallel side skirts (50) which are each provided with at least two holes (51, 53) intended to leave pass protrusions (12, 14) of a flange (1) forming part of a hinge according to any one   claims 13 to 15, characterized in that the hinge   left comprises a helical spring (20) the coils of which are wound and the slot (43) of the fixed part (30, 31) of which is oriented in the opposite direction to those of the right hinge, so that the tension of the springs ( 20, 21) is obtained by displacements of their   respective radial folds (23) in the same direction.