FR3071566A1 - COMPOSITE THREAD INSERT - Google Patents

Abstract

Device that concerns a composite threaded insert, fiber and resin, to fix on any surface, even if the other side is not accessible to us, and this, whatever the support, the material, or the available space of the 'other side. Device that can also be sealed according to a certain use. It includes a screw (1), a washer (2), 1 nut (3), fiber (eg fiberglass, carbon fiber ...) (4), resin (polyester, epoxy, polyurethane etc ...), demolding wax, and a link (eg cotton thread) (5). According to a first feature, the fiber impregnated with resin creates by molding a threaded insert (8) capable of receiving a screw of the same diameter, and not even screws as the mounting screw. According to a second characteristic, during the unscrewing of the nut (FIG. 2), the fiber (4) connected to the end of the screw (1) and impregnated with resin, swells, and comes to fit the wall (6). creating an omega (7) larger than the hole created in the wall, which will remove asperities as well as any irregularities of the wall dark side by adhesion, creating a single block wall / device, a solidity without none. The weakness then created by the perforation of the wall no longer exists. This device can adapt to any type of use (DIY, marine hardware etc ...).

Description

The present invention relates to a composite threaded insert, fiber and resin, to fix on any surface, even if the other side is not accessible to us, and this, whatever the support, the material, or even the available space of the other side.

This device can also be chosen to replace a traditional system for its prerogatives of solidity, water and / or pressure tightness (depending on a certain use), thermal cut, and suppressor of electrolysis effect.

There already exists a patent which relates to a device having the same functions and the same prerogatives, and of which I am the holder, however this new version allows a simplified use, and extended properties.

There are also other techniques which make it possible to obtain a subsidiary result such as the aluminum and PVC pegs which deviate in the support but which do not reach the solidity of the device according to the invention, and which other part do not eliminate the electrolysis effect depending on the material used (eg aluminum + stainless steel).

Still other systems allow bolting a screw to an area whose other side is not accessible to us, such as the screw + swivel washer system, or a kit using resin, but each time these devices show limits, either of solidity, or of waterproofing, or even of adaptability according to the support, the type of use, or space required.

The device according to the invention overcomes all these drawbacks.

It includes a screw (1), a washer (2), 1 nut (3), fiber (ex: fiberglass, carbon fiber ...) (4), resin (polyester, epoxy, polyurethane etc ...), mold release wax, and a link (ex: cotton thread) (5).

According to a first characteristic, the fiber soaked in resin creates by molding a threaded insert (8) capable of receiving a screw of the same diameter, and not even a screw as the screw used for mounting.

According to a second characteristic, when the nut (3) is unscrewed, the fiber (4) linked to the end of the screw (1) and soaked in resin, swells, and comes to marry the wall (6) creating a omega (7) larger than the hole created in the wall, which will remove any roughness as well as any irregularities in the dark side wall by adhesion, creating only a single wall / device block, of unparalleled solidity. The weakness then created by the perforation of the wall no longer exists.

According to a third characteristic, the combined use of a fiber (4) (glass, carbon, etc.) and a resin (polyester, epoxy, polyurethane, and other resins) compatible with the support, creates a thermal cut as well as the cancellation of the electrolysis effect.

This device can be adapted to any type of use, for example in the field of marine fittings. It allows to replace a rail of fargues or a guardrail without having to dismantle the interior of the boat. This device also applies to the fitting of a tap on a tank containing liquid (food liquid, fuel, etc.) using a resin compatible with the contents of the tank using the sealed version of the device.

The accompanying drawings illustrate the invention:

Figure 1 shows in section the first stage of production, Figure 2 shows in section the shaping step, Figure 3 shows in section what remains in the wall before insertion of a screw after drying.

With reference to these drawings, here is the step-by-step detail of the mode of use of the device according to the invention:

We use a screw (1), a washer (2), a nut (3), fiber (4), resin, mold release wax, and a link (5).

First, we assemble the elements that will allow the creation of a threaded insert (8) 15 ’in the wall as follows:

We apply demolding wax to the screw (1), the washer (2), as well as to the nut (3) so that the resin does not catch on it. We surround this assembly of fiber (4) and we attach this fiber to the end of the screw, using a link (5).

We make a hole in the wall (6) large enough to accommodate the assembly surrounded by fiber (4).

We dip the assembly in resin.

We insert the assembly in the hole, we unscrew the nut (3) while preventing the screw from turning (1) and the washer (2) pressed against the wall (6). Unscrewing then slides the screw (1) outwards. The fact of having linked the fiber (4) to the end of the screw (1), obliges, during unscrewing, the link (5) to approach the wall (6), forcing the fiber (4) to position itself in the shape of an omega (7), larger than the hole we made against the wall, which makes the latter more robust.

Then we allow the device to dry for the appropriate time depending on the resin used. By hardening the resin will have created by molding the thread (8) of the screw (1), and will have for properties, to reinforce the fiber (4), to maintain it in the desired position and to become integral with the wall (6) by creating a single solid block, threaded inside, ready to receive the final screw.

At this stage we are ready to bolt what we wish to fix to the wall, using the screw (1) or any other screw having the same diameter as well as the same pitch taking into account the thickness of what we want to attach to the wall (6) as well as the space available on the other side of the wall.

A variant of the device makes it possible to make a mounting having the additional prerogative of water and pressure tightness by letting the fiber protrude from the end of the screw, and by adding a second link around this surplus fiber, then completely closing the device. , which creates the seal.

The process is identical in all respects.

We emphasize that it is also possible to obtain sealing by using the device without the second link but by adding a sealant in the thread just before inserting the screw to bolt what we wish to fix to the wall ( 6).

In the context of an industrial application, and in the event that our assembly requires us to change the screw for reasons of space or for the waterproof assembly, we plan to replace the screw and the washer that we use during the first mounting step, by a threaded rod and a washer made of POLYPROPYLENE (PP) or POLYETHYLENE (PE), in order to eliminate the step of applying demolding wax and reduce the manufacturing cost of the device .

We note that the link can be any type of link or fastener (cotton thread, staples etc ...) the essential residing in the fact that the fiber used is linked to the end of the screw ( 1) so that, during tightening, it favors the swelling of the fiber against the wall while remaining close to the screw.

We note that the device according to the invention resides in the fact that the resin manufactures by molding a thread (8) ready to receive a screw, and this whatever the resin or the fiber used, as soon as we respect their compatibility between them, as well as with the supporting materials.

Claims (6)

1) Fixing device comprising a screw (1), or a threaded rod, a washer (2), a nut (3), fiber (4), resin and a link (5), characterized in that the fiber (4) soaked in resin, surrounds the screw and is linked to the end of the screw (1) using the link (5) so as to come to marry the wall (6) during the screwing-unscrewing of the device in a wall by creating an omega (7), larger than the hole in the wall, creating only a single wall / device block, and thus compensating for the weakness created by the perforation in the wall. 2) Device according to claim 1 characterized in that, after implementation and drying, the fiber soaked in resin creates by molding a threaded insert (8) capable of receiving a screw of the same diameter, and the same pitch as the screw (1). 3) Device according to claim 1 which further comprises demolding wax preventing the resin used from clinging to the screw (1), the washer (2) and the nut (3). 4) Method of using a fixing device characterized in that it comprises the steps consisting in: a) Apply demolding wax to the screw (1), the washer (2), as well as to the nut (3) so that the resin does not catch on it. b) Surround this assembly of fiber (4) and attach this fiber to the end of the screw, using a link (5). c) Make a hole in a wall (6) large enough to accommodate the mounting surrounded by fiber (4). Dip the assembly in the resin. d) Insert the assembly into the hole, unscrew the nut (3) while keeping the screw (1) and the washer (2) pressed against the wall (6), which then slides the screw outwards ( 1). The fact of having linked the fiber (4) to the end of the screw (1), obliges, during unscrewing, the link (5) to approach the wall (6), forcing the fiber (4) to position itself in the shape of an omega (7), larger than the hole made against the wall, which makes the latter more robust. e) Allow the device to dry for the appropriate time depending on the resin used. By hardening, the resin will have created by molding the thread (8) of the screw (1), and will have the properties of reinforcing the fiber (4), keeping it in the desired position and becoming integral with the wall (6) by creating a single solid block, threaded inside, ready to receive the final screw. f) Bolt what you wish to fix to the wall, using the screw (1) or any other screw having the same diameter as well as the same pitch, taking into account the thickness of what the 'We wish to fix to the wall (6) as well as the space available on the other side of the wall. 5) Method according to the preceding claim characterized in that, making the fiber protrude (4) relative to the screw (1), and a second link is added around this excess fiber, in order to make the device waterproof. 6) Method of using a fixing device according to one of claims 1 to 3 characterized 5 in that it comprises the steps consisting in: a) Use a threaded rod and a washer in Polypropylene (PP) or Polyethylene (PE) as well as a nut (3) b) Surround this assembly of fiber (4) and attach this fiber to the end of the threaded rod, using a link (5) 10 c) Make a hole in a wall (6) large enough to accommodate the assembly surrounded by fiber. Dip the assembly in the resin. d) Insert the assembly into the hole, unscrew the nut (3) while keeping the threaded rod and the washer (2) pressed against the wall (6), which then slides the threaded rod outwards (1 ). The fact of having linked the fiber (4) to the end of the threaded rod (1) obliges, during unscrewing, the link (5) 15 to approach the wall (6) constraining the fiber (4) to position itself in the shape of an omega larger than the hole made against the wall, which makes the latter more robust.