RU2696111C2 - Loop with centring guide for centring point of screw tip or drill through hole in loop - Google Patents

Abstract

FIELD: machine building.SUBSTANCE: loop (1) with a centering guide for centering the insertion point of the end of the fastening self-tapping screw or the drill bit in the support has at least one through hole (2) for inserting the corresponding fastening self-tapping screw (3) so as to secure loop (1) to support and comprises centering guide (4) connected to through hole (2) to allow alignment of end of fastening self-tapping screw or drill bit in support. Centering guide (4) is made as an integral part of loop (1) part (10), in which through hole (2) and the same material are located. Centering guide (4) is configured for deformation and/or destruction at least under action of a fastening self-tapping screw screwed into the support.EFFECT: higher accuracy of installation of the loop relative to the piece of furniture or door.17 cl, 17 dwg

Description

This invention relates to a hinge, which contains a centering guide for centering the point of entry of the end of the screw or drill into the support through the hole in the loop.

Hinges of various types are used to hinge a frame or a closing element (such as a door of a piece of furniture or a door in a house or office) with an appropriate jamb.

As a rule, the hinges contain two fasteners, one of which is located on the frame, and the other on the jamb and which are connected using a hinge device that allows them to rotate.

The hinge device can be made in various ways (for example, in the form of a single pin fixed in the socket, in the form of one or more links connected in a hinged manner and / or interacting in various ways with the fastening parts and / or connected between them to form a rotation axis, position which changes in space).

The loop can be a hidden, hidden type loop, that is, a loop in which the fasteners are located respectively inside the jamb and frame, and when the loop is in the closed position, these two fasteners together form a socket inside which the hinge device is completely located, and, thus Thus, when the frame is closed, the loop is invisible both from the inside and outside of the space covered by the closing element or frame.

Typically, each fastener has one or more through holes for passing the loop fixing screws to the corresponding support, namely, the frame or the jamb.

Typically, these through holes are made in the flat parts of the fasteners of the loop, in particular in the mounting flanges.

If the loop is a countersunk type loop, recesses are made in the support (frame or jamb) in which the indicated fasteners are located (in particular, the corresponding mounting flanges or parts in which the mounting holes are made).

For fixing the loop, various types of screws can be used: self-tapping screws (metal or wood) or metric screws.

Threaded holes (in the case of screws with metric threads) or holes without threads, the diameter of which is smaller than the diameter of the shaft of the screws (when using self-tapping screws) can be pre-made in the support (jamb or frame). In the latter case, the thread is applied by the screw itself when it is screwed into the support. In this case, the problem arises of the exact alignment of the axis of each screw with the axis of the hole or preliminary hole in the support, ensuring that the axis of the screw exactly matches the axis of the corresponding through hole in the loop.

Since the diameter of the hole or pre-hole in the support is less than or equal to the diameter of the screw shaft, the hole can be relatively easily centered relative to the end of the screw, while a more serious problem is to keep the axis of the screw aligned with the axis of the through hole in the loop.

In fact, the through holes in the loop intended for screws have an input part whose diameter exceeds the diameter of the screw shaft (in particular, a conical contact bevel for the extended part of the screw head).

If the screw is located in the through hole of the hinge not exactly centered, then after screwing it, problems may arise related to aligning the hinge with a door or a jamb, as well as with the location of the screw head on the hinge not strictly horizontal (in particular, not flush with the surface of the mounting flange) .

A similar problem also occurs when the holes are not made in advance and must be formed during threading by the self-tapping screw itself.

In addition, if you want to use a tool, such as a drill, for preliminary making holes in the support that serve as guides, there is a problem of positioning such holes relative to each other to ensure that they correspond exactly to the axes of the loop through hole.

There are various ways to solve these problems.

The first method involves the use of positioning patterns, which must be connected to the loop and jamb in various ways, after performing various positioning and alignment operations. Such a process is complex and requires the use of devices (positioning patterns), which, as a rule, are expensive and not always easily applicable to a number of different situations.

To solve this problem, US Pat. No. 3,003,059,267 proposes an eyelet made of plastic material and having a through hole into which a screw is inserted.

The eyelet has a cone-shaped end that corresponds to the tapered chamfer of the loop holes, which enables proper positioning of the screw relative to the hole. When the screw is screwed into the support, its head expands and breaks the ear through cracks extending in the directions of its lateral surface.

Another embodiment of the eyelet can be connected to the loop hole under pressure, having an internal through hole, the diameter of which is smaller than the diameter of the screw shaft, which can be used both to center the screw in the hole (using the end of the screw) and to center the end of the tool to perform holes. After screwing the screw into the support with the inside of the eyelet, any parts of the eyelet that remain on the outside must be removed with the end of the screwdriver.

This solution has the disadvantage of using an additional element that has its own cost and requires additional finishing operations to complete the work of securing the loop in a professional manner.

The above problem can lead to significant time losses and cost increases if you need to install a large number of loops and / or if there are several screw holes in the loop (which is a common situation).

In German patent document No. 3437161, a metal guide sleeve with an external thread is provided for screwing into each through hole of a loop, which is not a countersunk loop and is made with a single fixed pivot pin and flat mounting flaps.

In the through holes of the hinge made in the flat mounting flaps, a thread must be made in advance, corresponding to the thread on the sleeve and made on the part into which the screw head rests.

The sleeve protrudes over the entire height from the surface of the loop, remote from the support.

Since the inner diameter of the sleeve does not allow the screw head to pass, after creating the hole with the hole making tool, the sleeve must be unscrewed and the screw inserted in the usual way, which does not allow accurate screw centering relative to the hole of the loop.

In the second embodiment, the sleeve is made in one piece with a flat fastening leaf of the loop and cannot be removed from it or removed. After the hole has been made, the sleeve cannot be removed, and sufficiently long screws must be used to pass through the sleeve and reach the support. After screwing in the screw, its head abuts against the end of the sleeve, remote from the support, and protrudes from the plane of the fastening flap along the entire length of the sleeve.

This solution does not fully ensure proper alignment of the screws in the holes of the loop and is difficult to control (since there is a need to screw in the sleeve and unscrew it from the holes of the loop) or leads to protruding sections remaining on the loop, which complicates or eliminates the possibility its use in countersunk hinges, the connecting elements of which must be in contact with each other without the formation of large gaps between the flange parts.

US Pat. No. 3,0103,3437 discloses a process for centering elements in a loop hole with a single, fixed pivot pin and flat mounting flaps.

After making the loop, a special injection mold is used to form a Teflon membrane inside each hole with a central hole, the diameter of which is less than the diameter of the shaft of the screws inserted into the holes of the loop. Thus, the central hole can be used both to center the end of the tool for pre-drilling holes, and to center the end of the screw in the hole of the loop.

In the process of screw tightening (using a mechanical screwdriver), heat and friction destroy the Teflon membrane, and the screw is properly positioned with its head position flush with the hole inlet and the plane of the hinge plate.

This solution is also not without drawbacks. Although it provides the proper positioning of the screws (and / or tools for drilling holes), it is difficult to implement because it requires a casting step (which is not easy) in addition to making the loop and using other material. In addition, the implementation of the centering membranes is difficult to apply to hinges having a complex geometry, in particular, hinges of an invisible type, in which the fasteners are not completely flat, but have internal cavities, etc., located in shaped recesses inside the jamb and frame, articulated interconnected with loops.

The aim of the present invention is to eliminate the above disadvantages by creating a loop with a centering guide for centering the insertion point of the end of the screw or drill into the support through the hole in the loop, which is easy to manufacture and ensures proper alignment of the screws without problems when introducing screws into the support.

Another objective of the present invention is the creation of a loop with a centering guide for centering the point of entry of the end of the screw or drill into the support through the hole in the loop, and this guide is also easily applicable for blind hinges.

According to the invention, these and other objectives, which will become more clear from the description below, are achieved using a hinge, which contains a centering guide for centering the insertion point of the end of the self-tapping screw or drill into the support through the hole in the hinge and the structural and functional features of which are described in independent paragraphs claims, with alternative embodiments described in the respective dependent paragraphs of the attached claims.

The following is a more detailed description of the present invention with reference to the accompanying drawings, depicting a preferred, non-limiting embodiment.

FIG. 1 is a schematic perspective view of a hinge in an open position comprising a centering guide according to the invention, showing two hinge fasteners and a corresponding hinge device.

FIG. 2 is an enlarged fragment of FIG. 1, showing in detail the construction of an embodiment of a centering guide.

FIG. 3 is a rear perspective view of a fragment of FIG. 2.

FIG. 4 is a perspective view of a fragment of FIG. 2, in which some parts are shown in section, and some parts are removed for simplicity of the image.

FIG. 5 is a front view of one of the two fasteners of the hinge shown in FIG. 1, with some parts removed for simplicity.

FIG. 6 is an enlarged fragment of FIG. 5, showing in detail a centering guide located in one of the through holes of the loop, and elements of a part of the section plane AA in FIG. five.

FIG. 7 is a rear view of the fastener shown in FIG. five.

FIG. 8 is an enlarged fragment of FIG. 7 with a centering guide shown in a rear view disposed in one of the through holes of the loop, as shown in FIG. 6, and with elements of the same part of the plane AA section.

FIG. 9 is a section along the plane AA in FIG. 5, 6 and 8 of the part of the loop indicated by dashed lines in FIG. 5 and 7 and corresponding fragments shown in FIG. 6 and 8.

FIG. 10 shows a section that is similar to that shown in FIG. 9, and on which the dashed line shows the head and shaft of the screw, as well as the position occupied by the parts of the centering guide under the pressure exerted by the screw during its insertion into the support through the screw hole.

FIG. 11-17 depict respective embodiments of a centering guide located in a loop hole according to the invention. In particular, FIG. 11 is a sectional view similar to that shown in FIG. 9, of a second embodiment, FIG. 12 is an enlarged fragment of FIG. 11, detailing in dashed lines some additional elements, FIG. 13 depicts a modification of the embodiment shown in FIG. 11 and 12, with a view of elements similar to that shown in FIG. 12, FIG. 14 and 15 depict third and fourth embodiments, respectively; FIG. 16 and 17 depict the fifth embodiment, respectively, in a plan view similar to FIG. 6, and in section (along plane BB in FIG. 16), similar to FIG. 9.

According to the accompanying drawings, reference numeral 1 generally indicates a hinge with a centering guide for centering the insertion point of the screw or drill end into the support through an opening in said loop according to the invention. Hinge 1 is designed for rotary connection of a frame (piece of furniture or door), not shown in the drawings, with a jamb (body of a piece of furniture or door), which is also not shown in the drawings.

In particular, but without limiting the scope of the invention, FIG. 1 shows a loop 1 of a countersunk type located in the open position (corresponding to the open position of the frame). The hinge 1 contains the first and second fasteners 100, 101, articulated to each other using the hinge device 102. The elements 100, 101 as a whole have a complex structure, which preferably provides the ability to adjust the relative position of the various parts of the hinge 1, while the hinge device 102 also can be performed in various ways depending on requirements. The specific designs of these elements are not essential to the present invention and are not discussed in more detail. It should be noted that this invention is also applicable to loops of other types other than those shown in the drawings, in particular also to loops of non-countersunk type and / or loops with a single pivot pin.

Hinge 1 is a type of hinge having at least one through hole 2 for introducing a corresponding screw 3 to secure the hinge 1 to a support (not shown in the drawing). As a rule, the loop 1 has several through holes 2. More specifically, several through holes 2 can be made in each element 100, 101. The holes 2 are usually located in the mounting flanges of the elements 100, 101. The support corresponds to a part of the frame or corresponding jamb. In particular, in the case of countersunk loops, the support coincides with the part of the bottom of the recess, in which the holes 2 of the loop 1 are located at the time of installation of the corresponding elements 100, 101 in the corresponding recesses.

The hinge 1 contains a centering guide 4, connected with the hole 2 to ensure centering of the point of entry of the end of the screw or drill into the support. The guide 4 is made in one piece with the part 10 of the loop 1, in which the hole 2 is located, and of the same material. Thus, the loop 1 can be made directly by molding this part 10 of the loop together with the corresponding guide 4 in one step. More specifically, but without limiting the scope of the invention, part 10 of the loop 1 in which the hole 2 is located may be a mounting flange of one of the elements 100, 101.

The guide 4 can be made with the possibility of deformation and / or destruction at least under the action of a fastening self-tapping screw screwed into the support. Thus, the guide 4 is essentially automatically deactivated due to the direct action of the screw 3, if it is a self-tapping fastener. The same effect can be obtained in the case of screws with metric threads having an end with a certain taper (in particular, in the case of the so-called "trihedral" metric screws). For this reason, both in the case of fixing self-tapping screws (especially wooden, but also metal), and in the case of metric-threaded screws having a tapered end (in particular the so-called "triangular" screws), guide 4 can be used, if necessary, as for a drill a tool for making holes in the process of pre-drilling them in predetermined positions on the supporting part, and for centering the screws 3 in the holes 2.

As a rule, if it is necessary to use standard metric-threaded screws with a flat end, the guide 4 can usually be used to center the drill at a given support point and, as a rule, must be deformed and / or destroyed using another tool before inserting the metric screw into the through hole 2.

The guide 4 is located in accordance with the hole 2 and within the specified thickness, limited between:

- a flat surface part 11 of the loop 1, in which there is an entrance 20 of the hole 2, located remotely from the support, and

- those sections 12 of part 10 of the loop 1 containing the hole 2, which come into contact with the part of the support into which the screw 3 inserted into the hole 2 should be screwed.

Thus, the guide 4 remains within the dimensions of the loop 1 and does not create problems even in the case of a secret configuration of the loop.

Preferably, during deformation and / or destruction of the guide 4, the screw 3 reaches at least a position in which its head 30 is flush with the flat part 11 of the loop 1 containing the inlet 20 of the hole 2 located remotely from the support. This position is shown by dashed lines in FIG. 10 (on which, in particular, the head 30 is located below the edge of the flat part 11).

The hole 2 has an input part 21 located remotely from the support, and an output part 22 located closer to the support relative to part 21.

The output portion 22 limits the first passage 5, the diameter D1 of which corresponds to the diameter of the shaft 31 of the screw 3.

The guide 4 has a restriction part 40 located near the axis 23 of the hole 2, and a connecting part 41 connecting the part 40 to the part of the loop 1 in which the hole 2 is located.

The restriction portion 40 restricts the second passage 6, the diameter D2 of which is smaller than the diameter D1 of the first passage 5. This passage 6 serves to center the end of the screw 3 or drill. The diameter value D2 of the passage 6 is essentially defined as a function of the dimensions of the end of the screw 3 and / or its taper.

The lateral surface of the inlet 21 defines at least sectors 25 of the thrust surface 24 for the screw head 3. In the embodiment shown in FIG. 2-10, the surface 24 is discontinuous and contains sectors 25 (in this particular case, three, but possibly a larger number), spaced from each other. In the embodiment of FIG. 11-15, the surface 24 is continuous, and the sectors 25 forming it are connected to each other without gaps (and for this reason are indicated in the respective drawings by the reference number with a dotted extension line). In the embodiments depicted in FIG. 16 and 17, the latter configuration may also be used, differing in some features, which are described in more detail below.

Part 40 defines at least sectors 43 of the guide surface 42, which acts as a guide for the end of the screw and / or drill. For clarity, the numbers 42 and 43 of the positions are not indicated on all drawings (to leave room for other elements). In the case of the embodiment depicted in FIG. 2-10 and in FIG. 13 and 15-17, the surface 42 is discontinuous and contains sectors 43 spaced apart. In the embodiments depicted in FIG. 11, 12 and 14, the surface 42 is continuous, and the sectors 43 forming it are connected to each other without gaps (and for this reason are indicated on the respective drawings by the position number with a dotted extension line).

Preferably, the sectors 25 of the abutment surface 24 form the corresponding sectors of the conical bevel, the diameter of which decreases along the axis 23 of the hole 2 in the first direction X from the entrance 20 of the hole 2 to its output 26.

The inlet 20 and the outlet 26 (holes 2) are located respectively remotely from and near the support.

The sectors 43 of the surface 42 form the corresponding sectors of the conical surface restricting the passage, the diameter of which decreases along the axis 23 of the hole 2 in the first direction X.

At the inlet of the opening 2, the screw 3 at its end (not shown in the drawings) comes into contact with the surface 42 (in particular with a conical surface).

Preferably, the angle α of the conical bevel solution is greater than the angle 8 of the conical surface solution.

The angle α of the conical bevel solution formed by sectors 25 of surface 24 is substantially 40 ° to 50 °.

The angle α of the conical bevel solution formed by sectors 25 of surface 24 is preferably about 45 °.

The angle β of the solution of the conical surface formed by sectors 43 of the surface 42 is substantially 25 ° to 35 °.

The angle β of the solution of the conical surface (formed by sectors 43 of surface 42) is preferably about 30 °.

As can be seen from FIG. 10, the expression "angle of the solution" means the angle formed by the surface of the conical chamfer (or conical surface) with the axis of the hole 2.

In the examples depicted in the drawings, the conical chamfer formed by sectors 25 of the contact surface 24 has the form of a truncated cone (Fig. 11-17) or individual sectors of a truncated cone (Fig. 2-10).

In the examples depicted in FIG. 1-10, 13 and 17, the conical surface formed by sectors 43 of the surface 42 is formed by flat surfaces and, thus, has the shape of a truncated pyramid, and in FIG. 11, 12 and 14, said surface has the appearance of a truncated cone.

In the embodiments depicted in FIG. 11, 12 and 14, the guide surface 42 is made in the form of a continuous partition having a central hole 44. In this embodiment, at least the restrictive portion 40 of the guide 4 has grooves 45 that contribute to the deformation and / or destruction of the guide 4 under the action of the screw 3. In the same embodiment, the connecting part 41 of the guide 4 also has grooves 45, contributing to the deformation and / or destruction of the guide 4 under the action of the screw 3.

Part 40 is formed by separate sectors 46, each of which extends towards the axis 23 of hole 2 and delimits a corresponding individual sector 43 of the guide surface 42.

Part 41 is preferably formed by separate sectors 47, each of which is associated with a corresponding individual sector 46 of part 40.

In particular, in FIG. 2-10, a solution is shown in which the individual sectors 46 of part 40 are in the form of substantially wedge-shaped extensions having an inclined flat surface participating in the formation of the guide surface 42. A similar solution is also shown in FIG. 13 and 17. FIG. 15, the individual sectors 46 of the restriction portion 40 are depicted in the form of long teeth, tapering towards the axis 23 of the hole 2.

In particular, in FIG. 2-10, 13 and 17, the individual sectors 47 of the part 41 are made in the form of legs (shown in the drawings as sections of a thin plate) connecting the individual sectors 46 of the part 40 with the parts 10 of the loop 1 in which the hole 2 is located. FIG. 15, the individual sectors 47 of the part 41 do not have gaps with respect to the individual sectors 46 of the part 40 extending continuously towards the parts 10 of the loop 1 in which the opening 2 is located.

In the embodiment of FIG. 2-10:

- the connecting part 41 is formed by separate sectors 47, each of which is associated with a corresponding individual sector 46 of the restrictive part 40 (as described above),

- the individual sectors 47 of the part 41 are at least partially located in the respective sockets 27 made in the side surface of the hole 2.

This provides the possibility of better distribution and control of spaces and greatly facilitates the molding of parts of the guide 4. In fact, with the same dimensions of the screws 3, these parts can be made with large sizes.

Furthermore, as shown in FIG. 2-10, preferably the individual sectors 47 of the part 41 are completely located in the respective sockets 27 made in the side surface of the hole 2.

In addition, as shown in the drawings, the slots 27 are preferably made in the form of grooves parallel to the axis 23 of the hole 2. The grooves interrupt the abutment surface 24 with the formation of its respective individual sectors 25.

As shown in FIG. 2-10, 13, 16 and 17, the connecting part 41 is shaped and / or thinned with respect to the restrictive part 40 to a value that contributes to the deformation and / or destruction of the guide 4 under the action of the screw 3.

In the embodiment of FIG. 2-15, part 41 (whether it is continuous or discontinuous) extends radially towards the axis 23 of hole 2. In more detail, in FIG. 2-10 and 13 show an embodiment of a part 41, which extends essentially in a direction perpendicular to the axis 23 of the hole 2, in FIG. 15 shows an embodiment of a part 41, which also extends in the direction of exit 26 of the hole 2.

In the embodiment of the connecting part 41 shown in FIG. 16 and 17, part 41 extends along the axis 23 of hole 2.

Preferably, at the side surface of the hole 2 at a distance from its axis 23, exceeding half the diameter of the rod 31 of the screw 3 or equal to it, the first receiving spaces 7 are formed, serving as places of reception of parts of the guide 2, deformed and / or destroyed by the screw 3.

In particular, as shown in FIG. 2-10, the first receiving spaces 7 can be formed at least in part by sockets 27 formed in the side surface of the opening 2. More specifically, in FIG. 10 also schematically depicts a partially destroyed and deformed guide 4 inserted into slots 27 and / or corresponding spaces 7 after exposure to the screw 3. In addition, as shown in FIG. 16 and 17, the spaces 7 may have recesses 70 made in the abutment surface 24 and intended to accommodate the sectors of the part 41 and the corresponding sectors of the part 40 deformed and / or destroyed under pressure of the screw 3.

In addition, in loop 1, within a thickness limited between:

- a flat surface part 11 of the loop 1, in which there is an entrance 20 of the hole 2, located remotely from the support, and

- those sections 12 of part 10 of the loop 1 containing the hole 2 that come into contact with the part of the support into which the screw 3 inserted into the hole 2 should be screwed

can be made of the second receiving space 8, serving as places for receiving parts of the guide 2, deformed and / or destroyed by the screw 3.

The spaces 8 for accommodating parts of the guide 2, deformed and / or destroyed by the screw 3, are preferably spaced from the axis 23 of the hole 2 by a distance greater than or equal to half the diameter of the shaft 31 of the screw 3.

Preferably, the spaces 8 are limited by the outlet 22 of the opening 2.

The invention provides important advantages.

More specifically, all operations for pre-drilling holes and centering the screws (in particular self-tapping screws and / or metric thread "screws") can be performed without the use of centering devices or templates that are additional elements and / or located outside the loop .

In addition, the centering guide may be molded and / or molded at the same stage as the part of the loop having through holes for screws.

The invention is suitable for most types of loops, in particular for countersunk loops.

The described invention can be modified and modified in various ways without deviating from the scope of the invention.

In addition, all elements of the invention can be replaced by other, technically equivalent elements.

In practice, embodiments of the invention can be made of any material and have any size depending on requirements.

Claims (17)

1. A hinge (1) for a piece of furniture or a door, having at least one through hole (2) for introducing a corresponding fixing screw (3) for attaching to the support and containing a centering guide (4) for centering the insertion point of the end of the fixing screw or drill into the support through the specified through hole, while the centering guide is placed in the specified through hole (2), characterized in that the centering guide (4) is made in one piece with the part (10) of the loop (1), in which Jeno through hole (2) and of the same material and with the possibility of deformation and / or destruction of at least under fixing self-tapping screws screwed into the support. 2. The loop according to claim 1, characterized in that the centering guide (4) is located in the through hole (2) and within the thickness limited between the flat surface part (11) of the loop (1) in which the inlet (20) of the through holes (2), remote from the support, and sections (12) of the part (10) of the loop (1) having the specified through hole (2) that come into contact with the part of the support into which the self-tapping screw (3) is screwed in through hole (2). 3. The loop according to claim 1, characterized in that when the centering guide (4) is deformed and / or destroyed, the self-tapping fixing screw (3) reaches at least the position in which its head (30) is flush with said flat part (11) ) loop (1) containing the inlet (20) of the through hole (2) located remotely from the support. 4. The loop according to claim 1, characterized in that the through hole (2) has an input part (21) located remotely from the support and an output part (22) located closer to the support relative to the input part (21) and restricting the first passage (5), the diameter (D1) of which corresponds to the diameter of the rod (31) of the self-tapping screw (3), the centering guide (4) has a limiting part (40) located near the axis (23) of the through hole (2), and a connecting part ( 41) connecting the restrictive part (40) with the part of the loop (1) in which the through e hole (2), wherein the restrictive part (40) bounds the second passage (6), the diameter (D2) smaller than the diameter (D1) of the first passage (5). 5. The loop according to claim 4, characterized in that the lateral surface of the inlet part (21) limits at least the sectors (25) of the thrust surface (24) for the screw head (3), while the restrictive part (40) limits at least sector (43) of the guide surface (42), acting as a guide for the end of the fastening self-tapping screw and / or drill. 6. The loop according to claim 5, characterized in that the sectors (25) of the thrust surface (24) form the corresponding sectors of the conical bevel, the diameter of which decreases along the axis (23) of the through hole (2) in the first direction (X) from the inlet (20) ) through hole (2) to its outlet (26), while the inlet (20) and outlet (26) are located respectively remotely from and near the support, and the sectors (43) of the guide surface (42) form the corresponding sectors of the conical surface bounding a passage whose diameter decreases along the axis (23) of the through hole (2) in the first direction (X). 7. The loop according to claim 6, characterized in that the angle (α) of the conical bevel solution is greater than the angle (β) of the conical surface solution. 8. The loop according to claim 5, characterized in that the guide surface (42) is made in the form of a continuous partition having a central hole (44), at least the restrictive part (40) of the centering guide (4), and preferably also connecting part (41) of the guide (4), have grooves (45), contributing to the deformation and / or destruction of the guide (4) under the action of a fastening self-tapping screw (3). 9. The loop according to claim 5, characterized in that the restrictive part (40) is formed by separate sectors (46), each of which extends towards the axis (23) of the through hole (2) and delimits a corresponding separate sector (43) of the guide surface (42), and the connecting part (41) is preferably formed by separate sectors (47), each of which is associated with a corresponding separate sector (46) of the restrictive part (40). 10. The loop according to claim 9, characterized in that the connecting part (41) is formed by separate sectors (47), each of which is associated with a corresponding separate sector (46) of the restrictive part (40), while the individual sectors (47) of the connecting part (41) at least partially, preferably completely, are located in corresponding sockets (27) made in the lateral surface of the through hole (2), and the nests (27) are preferably made in the form of grooves parallel to the axis (23) of the through hole (2) and interrupting the thrust surface (24) with ar mations its respective individual sectors (25). 11. The loop according to claim 4, characterized in that the connecting part (41) has such a shape and / or is thinned with respect to the restrictive part (40) to such a value that promotes deformation and / or destruction of the centering guide (4) under the action of a self-tapping fastener screws (3). 12. The loop according to claim 10, characterized in that the connecting part (41) has such a shape and / or is thinned relative to the restrictive part (40) to such a value that promotes deformation and / or destruction of the centering guide (4) under the action of a self-tapping fastener screws (3). 13. The loop according to claim 4, characterized in that the connecting part (41) extends radially towards the axis (23) of the through hole (2). 14. The loop according to claim 4, characterized in that the connecting part (41) extends along the axis (23) of the through hole (2). 15. The loop according to claim 10, characterized in that the connecting part (41) extends along the axis (23) of the through hole (2). 16. The loop according to claim 1, characterized in that at the side surface of the through hole (2) at a distance from its axis (23) exceeding half the diameter of the rod (31) of the self-tapping screw (3) or equal to it, the first receiving spaces are formed (7), serving as receiving points for the parts of the centering guide (4), deformed and / or destroyed under the action of a fastening self-tapping screw (3). 17. The loop according to claim 1, characterized in that, within the thickness of the loop, limited between the flat surface part (11) of the loop (1), in which the inlet (20) of the through hole (2) is located remotely from the support, and those sections (12) of the part (10) of the loop (1) having the specified through hole (2) that come into contact with the part of the support into which the fastening self-tapping screw (3) inserted into the through hole (2) is to be screwed a distance from the axis (23) of the through hole (2) exceeding half the diameter of the rod (31) of the self-tapping fastener about the screw (3) or equal to it, the second receiving spaces (8) are formed, serving as places for receiving parts of the centering guide (4), deformed and / or destroyed by the fastening self-tapping screw (3).

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