FR2963814A1 - Fixing peg for fixing e.g. decorative element of furniture on wall or tube, has two elements mounted on level of two elbows between introduction position and fixing position in which threaded parts are placed side by side to form threading - Google Patents

Abstract

The fixing peg (6) has an element (8) comprising a threaded part (28) extending along first direction (32). A maintaining part (52) extends along second direction (56). An elbow (12) connects the threaded and maintaining parts. Another element (10) comprises a threaded part (30) extending along a third direction (34). The two elements are mounted on a level of two elbows (12, 14) between an introduction position and a fixing position in which the threaded parts are placed side by side to form a threading, where two maintaining parts (52, 54) are swiveled with respect to each other.

Description

ANCHORING ANKLE

The invention relates to a fixing pin for fixing for example a decorative element or a light furniture on a wall or a tube.

Fastening dowels known to the applicant are so-called "plugged" plugs. These dowels are housed in a pilot hole formed inside a wall. They generally comprise a breakthrough in which is screwed a screw. Screwing the screw into the hole deforms the ankle which is then compressed in the pilot hole. As a result of this deformation, frictional forces exerted on the contact surface between the peg and the pilot hole make it possible to fix the peg and the screw to the wall. The inserted plugs are particularly suitable when the thickness of the wall is of the same order of magnitude as the length of the ankle. For example, their use is common for thick walls of prefabricated plaster. When the thickness of the wall becomes too small with respect to the length of the dowel, the frictional forces occurring at the contact surface are generally not sufficient to hold a fixed load on the dowel. In particular, these dowels are not suitable when the wall is a thin sheet or a tube. In order to overcome this drawback, known fastening dowels are the so-called "retractable" dowels. These dowels are housed in a pilot hole, it passes through the wall from side to side. The ankle is arranged so that a collar of the ankle comes into contact with a first face of the wall and that the other end of the peg protrudes relative to the second face of the wall. These dowels have a hole in which is screwed a screw. During screwing of the screw, the pin undergoes a mechanical stress such that the end of the projecting pin retracts axially under the effect of this constraint and locks the pin against the second face of the wall in the manner of a nut. A disadvantage of such an anchor is that the material in which the peg is made must be flexible enough to be deformed under the effect of a mechanical stress exerted by a screwdriver for example. In fact, some materials too rigid can not be used for the realization of these dowels. In addition, their attachment is generally irreversible and their assembly is sometimes considered tedious. In addition, these dowels are generally unsuitable for attachment to a non-planar wall, such as a tube. Moreover, these dowels generally have a complex shape which thereby complicates their manufacturing process. Moreover, such pins do not include a threaded portion projecting out of the hole. It can further be noted that no known satisfactory solution provides easy attachment to a mechanical element whose rear face is not or is difficult to access, in order to report a thread on this mechanical element. This is particularly the case for example on a tube, on the back of a sheet metal plate, on a machine tool casing, an electrical cabinet, etc. The invention aims to solve one or more of these problems. disadvantages. The invention thus relates to a wall attachment peg, comprising: a first member having a threaded portion extending in a first direction, a retaining portion extending in a second direction, a bend bending the threaded portions and holding member, and a second member having a threaded portion extending in a third direction, a holding portion extending in a fourth direction, and a bend binding the threaded and holding portions, the first and second members being pivotally mounted at the elbows, about an axis, between: an insertion position in which the holding portions of the first and second elements are contiguous, and an attachment position in which the threaded portions of the first and second elements are contiguous to forming a thread on which a nut can be screwed and wherein the holding portions are rotated relative to each other. The attachment pin described above is suitable for attachment to a wall having a small thickness and more particularly for attachment to a tube.

This peg is articulated between an insertion position in a pilot hole formed in a wall and a fixing position to this wall by pivoting the first element relative to the second element. The maintenance is then guaranteed by screwing a nut on the formed thread. Fixing this ankle is particularly easy and with a minimum of tools. The articulation of the ankle depends on the geometry of the first and second elements. Thus, even rigid materials can be used to make this ankle. According to a variant, the peg comprises an elastic ring holding the elbows of the first and second elements contiguous to each other. According to another variant of the recesses are respectively formed in the elbows and the ring is housed in these recesses. According to another variant, the first element comprises a projection extending radially relative to the first direction to form a stop adapted to stop the rotation of a nut screwed onto the thread formed by the threaded portions. According to yet another variant, the first and second elements have, respectively, a male member and a female member mutually engaging in the position of attachment of the first and second members. According to another variant, the vertices of the male and female members are bevelled so as to ensure the centering of the male member in the female member. According to another variant, the holding portion of at least one of the first or second elements has a flared profile, the cross section of the holding portion being closest to the bend being smaller than the cross section of this portion of keeping the furthest away from the elbow. According to another variant, the elements comprise bulges at the junction between the bends and the threaded portions.

According to yet another variant, the angle formed by the second and fourth directions in the attachment position of the first and second elements is between 150 ° and 220 °. According to another variant, the angle formed by the first and second directions and / or by the third and fourth directions in the insertion position of the first and second elements is between 70 ° and 110 °. Other features and advantages of the invention will become apparent from the description which is given below, for information only and in no way limitative, with reference to the accompanying drawings, in which: - Figure 1 is an illustration in side view of a fixing pin in a first step of attachment to a tube (shown in section); - Figure 2 is an illustration in a rear view of the pin of Figure 1; - Figure 3 is an illustration of FIG. 4 is a flowchart of a method of fixing the peg of FIG. 1; FIGS. 5a, 5b, and 5c are side view illustrations of FIG. an anchor in position, respectively, of introduction, during pivoting and fixation during the implementation of the method of FIG. 4, FIGS. 6a and 6b are side view illustrations of a first variant of the ankle of FIG. 1, FIGS. an illustration in perspective of a second variant of the peg of FIG. 1, and FIGS. 7b and 7c are perspective illustrations of the variant of FIGS. 7a in position, respectively of introduction and fixing during the implementing a method of fixing this variant. Figures 1, 2 and 3 illustrate a tube 2 such as a pipe. The tube 2 comprises a wall and a pilot hole 4 passing right through this wall. A first end of a fixing pin 6 passes through this pilot hole 4. This pin 6 comprises two elements 8 and 10 pivotally mounted relative to each other so that the pin 6 is deformable between: an insertion position in which the first end of the pin 6 can be introduced into the pilot hole 4, and a fixing position in which the pin 6 is fixed to the tube 2, the first end of the pin being retained by the wall of the tube 2. In Figures 1, 2 and 3, the pin 6 is in the insertion position.

The elements 8 and 10 are pivotally mounted relative to one another about an axis 11. The elements 8 and 10 are pivotally mounted at elbows 12 and 14 arranged opposite each other and formed respectively in elements 8 and 10. The elements 8 and 10 further comprise threaded portions, respectively, 28 and 30. These threaded portions 28 and 30 extend, respectively, from the bends 12 and 14 in directions 32 and 34. elements 8 and 10 also have holding portions 52 and 54. These holding portions 52 and 54 extend, respectively, from the bends 12 and 14 in directions 56 and 58. The elbows 12 and 14 respectively comprise faces external 16 and 18 for bearing against the wall of the tube 2 at the periphery of the pilot hole 4 in the fixing position. The elbows 12 and 14 also comprise internal faces 20 and 22 intended to bear against one another to guide the relative pivoting of the bends 12 and 14. The threaded portions 28 and 30 comprise: concave faces, respectively , 36 and 38 each having a half-thread, and-contact faces, respectively, 40 and 42 intended to be placed against each other when the pin 6 is in its fixing position. The holding portion 52 and 54 are intended to bear against the wall of the tube 2 in the fixing position.

In order to better guide the relative pivoting of the bends 12 and 14, toothings form an alternation of projections 24 and recesses 26 of complementary shapes on the internal faces 20 and 22. These projections 24 and these recesses 26 are shaped so that they when the elbows 12 and 14 pivot about the axis 11, the teeth meshing, the projections 24 being housed in the housing 26 arranged vis-à-vis. In the example, the projections 24 are in the form of prisms. Here, the vertices of these projections 24 are bevelled so as to center the projections 24 in the housing 26 during meshing. Still in the example, the projections 24 and 30 housings 26 extend in directions parallel to the axis 11. These toothing index the relative pivoting position between the elements 8 and 10 to ensure the continuity of the thread formed in fixing position. In order to keep the inner faces 20 and 22 against each other, the elements 8 and 10 are preferably surrounded by an elastic ring 27 at the elbows 12 and 35. The ring 27 remains, for example, wedged in a recess at the outer faces 16 and 18. By its elasticity, the ring 27 can adapt to the variation of section that surrounds during the pivoting of the elements 6 and 8. In the example, the threaded portions 28 and 30 are generally in the form of half cylinders whose cross section is a semicircle. In the attachment position, the threaded portions 28 and 30 form a complete thread on which a nut can be screwed. The half-threads of the threaded portions 28 and 30 are then in continuity with each other. The faces 40 and 42 advantageously have a chamfer on their edge. In the fixing position, a clearance is thus created for possible manufacturing burrs.

In the example, the contact faces 40 and 42 comprise, respectively, a male member 44 and a female member 46. The contact faces 40 and 42 also comprise planar portions respectively surrounding the members 44 and 46. The members 44 and 46 have complementary shapes so as to fit when the faces 40 and 42 are contiguous. Such interlocking makes it possible both to prevent sliding between the contact faces 40 and 42 and to align the half-threads. In the example, the male member 44 is a longitudinally extending prism in the direction 32. Still in the example, the female member 46 is a longitudinally extending groove in the direction 34. Advantageously, the top of the male member 44 is bevelled so as to ensure the centering of the member 44 during its penetration into the member 46. The threaded portions 28 and 30 further comprise bulges, respectively, 48 and 50 which extend perpendicularly. to the directions 32 and 34. These bulges 48 and 50 form a suitable abutment, when the pin 6 is in the fixing position, to stop a nut screwed on the thread formed by the meeting of the threaded portions 28 and 30. The bulges 48 and 50 also form a stop at one end of the recesses to prevent the ring 27 from detaching the peg 6 when the latter is in the fixing position. Here, these bulges 48 and 50 are, respectively, disposed at the junction between the bend 12 and the threaded portion 28 and at the junction between the bend 14 and the threaded portion 30.

Advantageously, the angle formed between the holding portions and the threaded portions is between 70 ° and 110 °. Such an angle maximizes the grip of the holding portions on the wall of the tube 2 for a given length thereof. Pivoting of the elements 8 and 10 is then achieved by pivoting around the bends 12 and 14, bringing the threaded portions 28 and 30 closer or, conversely, by moving these parts away from each other. In the illustrated example, this angle is 90 °. In the example, the holding portions 52 and 54 have the shape of half cylinders whose cross section is semicircular. The holding portions 52 and 54 comprise: - holding faces, respectively, 59 and 61 intended to be pressed against the wall of the tube 2 when the pin 6 is in the fixing position, and - clamping faces, respectively, 60 and 62 intended to be placed against each other when the pin 6 is in its insertion position. Advantageously, the holding portions 52 and 54 have a flared profile. Their cross section is smaller near the elbows 12 and 14 and greater distance from the elbows 12 and 14. Advantageously, the edges of the clamping faces have a chamfer. Thus, the incidence of possible manufacturing burrs on the operation of the peg 6 would be reduced, the chamfers forming a clearance for such burrs. When the peg is in the fixing position, the angle formed by the directions 56 and 58 is preferably between 150 ° and 220 °. In the illustrated example, this angle is 180 °. The holding faces 59 and 61 extend, respectively, from the outer faces 16 and 18 of the bends 12 and 14. The clamping faces 60 and 62 extend, respectively, from the inner faces 20 and 22 of the bends 12 and Advantageously, the holding faces 59 and 61 have asperities in order to increase the grip on the wall of the tube 2. Advantageously, the clamping faces 60 and 62 are shaped so that when the ankle 6 is in the insertion position, the distance between these clamping faces 60 and 62 is zero so as to minimize the diameter of the pilot hole 4 allowing the introduction of the pin 6. Here, the clamping faces 60 and 62 are flat.

The fixing method of the peg 6 will now be described with reference to FIG. 4. During a step 70, the peg 6 is placed in the insertion position. In this position, the clamping faces 60 and 62 of the holding portions 52 and 54 are contiguous. The threaded portions 28 and 30 are then spaced apart relative to one another and the directions 32 and 34 extend parallel to the wall of the tube 2. The ring 27 is arranged around the elements 8 and 10 at the elbows 16 and 18. The pin 6 25 in the insertion position is arranged in the pilot hole 4 so that: the holding parts 52 and 54 are disposed inside the tube 2, and the threaded parts 28 and 30 are arranged outside this tube 2. In a step 72 (illustrated in FIG. 5a), the pivoting of the elements 8 and 10 is initiated so as to move the clamp faces 60 and 62 holding parts. In a step 74, the pivoting of the elements 8 and 10 about the axis 11 is continued (intermediate position shown in FIG. 5b) until the plane portions of the faces 40 and 42 of the threaded portions 28 and 30 are contiguous to each other. The holding portions 52 and 54 pivot about the axis 11 until the holding faces 59 and 61 bear against the walls of the tube 2. Finally, during a step 76 (illustrated in FIG. 5c ), a nut 44 is screwed onto the thread formed by the threaded portions 28 and 30 to maintain the pin 6 in the fixing position. An object may for example be attached to the peg 6 between the tube 2 and this nut. FIGS. 6a and 6b illustrate an ankle 90. The peg 90 is identical to the peg 6, except that the peg 90 comprises by Moreover a spring 92 fixed to the holding portions 52 and 54. This spring 92 is shaped so that when the pin 6 is in the insertion position (illustrated in Figure 6a), the spring 92 exerts a restoring force on the holding portions 52 and 54 urging the pin 6 to its attachment position (illustrated in Figure 6b). Thus, in the absence of stress, the pin 90 is stably returned to its fixing position. The shape of the spring 92 is now further described with reference to Figure 6b. In the example, the spring 92 comprises a rectangular base 94 which extends longitudinally along the clamp faces 60 and 62 between ends 93 and 95 of these portions. Here, the base 94 has at its ends hooks 97 fixing the base 94 to the ends 93 and 95. Furthermore, the spring 92 comprises a bridge 96 connecting the holding portions 52 and 54. The bridge 96 has two arms 98 and 100 fastened respectively by fasteners 102 and 104 to the base 94. Here, the fasteners 102 and 104 extend in the width direction of the holding portions, respectively 52 and 54. In the example, the fasteners 102 and 104 pinches the holding portions 52 and 54 by means of hooks 106 arranged at the ends of these fasteners 102 and 104. When the pin 90 is in the insertion position, the arms 98 and 100 are bent and brought closer together. the other, and the base 94 is folded symmetrically into two half-bases opposite. When the pin 90 is in the fixing position, the base 94 is in the extended position and the arms 98 and 100 form a triangular projection relative to this base 94. The fixing method of the pin 90 is identical to the fixing method of the 6. Figures 7b and 7c illustrate a pin 120 deformable between an insertion position (shown in Figure 7b) and a fixing position (illustrated in Figure 7c). The shape of the peg 120 is illustrated more precisely in FIG. 7a. The peg 120 is identical to the peg 6 except that the threaded portions 28 and 30 are replaced by tapped portions 122 and 124. In the example, the tapped portions 122 and 124 are hollow half-cylinders. shaped so that when the tapped portions 122 and 124 are disposed vis-a-vis in the fixing position, they define a tapped inner bore in which can be screwed a screw 127. In the example illustrated, the tapped parts 122 and 124 comprise pads, respectively, 126 and 128 for engaging a ring 130. Here, the pads 126 and 128 extend radially with respect to the threaded portions 122 and 124. The ring 130 encircles the threaded portions. 122 and 124 to hold them against each other when the pin 120 is in the fixing position. The ring 130 has notches 132 for receiving and locking the pads 126 and 128. 40 Thus, the ring 130 ensures the locking of the pin in the fixing position. A ring 27 can be mounted behind the pads 126 and 128 to hold together the elements 8 and 10 and allow their relative pivoting. In this example, the holding portions 52 and 54 are replaced by holding portions 136 and 138 on which the faces intended to come into contact with the inner wall of the tube 2 comprise serrations 140 so as to increase the grip of the holding portions 136 and 138 to the tube 2. The fixing method of the peg 120 comprises the introduction of the holding portions 136 and 138 through the pilot hole 4 (Figure 7b). During the introduction, the pads 126 and 128 strike the wall and induce the pivoting of the elements 8 and 10. This pivoting is continued until the holding portions 136 and 138 are completely spaced apart and the tapped parts 122 and 124 are brought together (FIG. 7c). The screw 127, inserted in a bore of the ring 130, pushes the ring 130 into the front hole 4. The ring 130 is then rotated to put the pads 126 and 128 in engagement with the notches 132. The ring 130 then holds the peg 6 in the fixing position. The screw 127 can easily be screwed and unscrewed from the peg 6.

Many other embodiments are possible. The elastic ring 27 may be replaced by a circlip or other similar device. The elastic ring 27 can also be omitted by providing for example the arms respectively of a shaft and a cooperating bore to ensure their pivotal guidance and mechanical connection. . The clamping faces 60 and 62 of the holding portions are not necessarily flat. Projections and housings of complementary shapes disposed vis-a-vis may be used to ensure the centering of these faces relative to each other. The stops 48 and / or 50 may be omitted. Likewise, the members 44 and 46 may be omitted. The holding portions of the pins 6, 90 and 120 are not necessarily semi-cylindrical. They can have any type of shape, for example flat to increase the contact area with a flat wall.

Claims (10)

REVENDICATIONS1. Wall-fixing anchor characterized in that it comprises: - a first element (8) having a threaded portion (28) extending in a first direction (32), a holding portion (52) extending according to a second direction (56), a bend (12) linking the threaded and retaining portions (28, 52), and - a second member (10) having a threaded portion (30) extending in a third direction (34) a holding portion (54) extending in a fourth direction (58), and a bend (14) connecting the threaded and holding portions (30, 54), the first and second members (8, 10) being mounted pivoting at elbows (12, 14) about an axis (11) between: - an insertion position in which the holding portions (52, 54) of the first and second members (8, 10) are contiguous, and - a fixing position in which the threaded portions (28, 30) of the first and second elements (8, 10) are joined together to form a thread on which a nut can be screwed and wherein the holding portions (52, 54) are rotated relative to each other. 2. Ankle according to claim 1, comprising an elastic ring (27) holding the bends (12, 14) of the first and second elements (8, 10) 25 against one another. 3. Ankle according to claim 2, wherein recesses are formed respectively in the bends (12, 14) and wherein the ring (27) is housed in these recesses. 30 4. An anchor according to any one of the preceding claims, wherein the first element (8) has a projection (48) extending radially relative to the first direction (32) to form a stop adapted to stop rotation of a nut screwed onto the thread formed by the threaded portions. 5. Anchor according to any one of the preceding claims, wherein the first and second elements (8, 10) have, respectively, a male member (44) and a female member (46) interlocking with each other 40 in the fixing position. first and second elements (8, 10). 20 6. Anchor according to claim 5, wherein the vertices of the male and female members (44, 46) are bevelled so as to ensure the centering of the male member (44) in the female member (46). An anchor according to any one of the preceding claims, wherein the holding portion (52, 54) of at least one of the first or second members (8, 10) has a flared profile, the cross section of the portion of maintaining (52, 54) being closest to the bend (12, 14) being smaller than the cross section of that holding portion (52, 54) furthest from the bend (12, 14). 8. Anchor according to any one of the preceding claims, wherein the elements comprise bulges at the junction between the bends and the threaded portions. An anchor according to any one of the preceding claims, wherein the angle formed by the second and fourth directions (56, 58) in the fixing position of the first and second elements (8, 10) is between 150 ° and 220 °. An anchor according to any one of the preceding claims, wherein the angle formed by the first and second directions (32, 56) and / or by the third and fourth directions (34, 58) in the insertion position. first and second members (8, 10) are between 70 ° and 110 ° .15