FR3060677A1 - BOLT ANTI-LOOSENING. - Google Patents

Abstract

The proposed bolt comprises: • a screw with a threaded rod having a removal of material over at least a part of its length • a nut, • a locking device in rotation and in translation of the nut extending over at least one part of the periphery of the threaded rod and comprising on the one hand a zone of complementary shape to the threaded rod at the level of the removal of material and secondly hooking means cooperating with complementary fastening means made on the nut.

Description

© Publication no .: 3,060,677 (to be used only for reproduction orders)

©) National registration number: 16 70773 ® FRENCH REPUBLIC

NATIONAL INSTITUTE OF INDUSTRIAL PROPERTY

COURBEVOIE

©) Int Cl ⁸ : F16 B 39/10 (2017.01), F 16 B 39/08

A1 PATENT APPLICATION

©) Date of filing: 20.12.16. (30) Priority: © Applicant (s): TAISNE BRUNO - FR. ©) Inventor (s): TAISNE BRUNO. @) Date of public availability of the request: 06.22.18 Bulletin 18/25. (56) List of documents cited in the preliminary search report: See the end of this brochure (© References to other related national documents: ©) Holder (s): TAISNE BRUNO. ©) Extension request (s): @) Agent (s): TAISNE BRUNO.

(04) anti-loosening bolt.

FR 3 060 677 - A1

The proposed bolt comprises: a screw with a threaded rod having a material removal over at least part of its length a nut, a device for locking in rotation and in translation of the nut extending over at least part of the periphery of the threaded rod and comprising on the one hand a zone of shape complementary to the threaded rod at the material removal and on the other hand hooking means cooperating with complementary hooking means produced on the nut.

-1 The present invention relates to a bolt comprising a screw and a nut with further anti-loosening means of the nut.

There are anti-loosening bolts but they sometimes lead to drilling in the threaded rod, which reduces the solidity of the assembly, or consist of several nuts, which makes the bolt heavier, or slow down unscrewing without the ban absolutely. The fact that such bolts are not widespread shows their difficulty in implementation or manufacture.

The present invention therefore aims to provide a simple nut locking system and leading to total immobilization of the nut. Advantageously, the unscrewing of the nut is only made possible by the removal of an additional part added after the nut.

A bolt is then proposed comprising a screw with a threaded rod and a nut, characterized in that the threaded rod has a material removal over at least part of its length, in that the bolt further comprises a locking device in rotation and in translation of the nut extending over at least part of the periphery of the threaded rod and comprising on the one hand a zone of shape complementary to the threaded rod at the level of removal of material and on the other hand, attachment means cooperating with complementary attachment means produced on the nut.

The removal of material is such that it does not prevent the nut from cooperating normally with the threaded rod of the screw. To make a fixing, the nut is screwed onto the threaded rod and tightened. Thereafter, the locking device is engaged on the threaded rod by making the zone of complementary shape cooperate with the zone comprising the removal of material. Thus, this blocking device cannot rotate relative to the threaded rod. Finally, by hooking the locking device on the nut, the nut is then prevented from turning and therefore loosening.

In a preferred embodiment, the removal of material from the threaded rod of the screw forms a flat on said rod. Other types of material removal may be provided. For example, one, two, three or more longitudinal grooves, possibly helical or other can be made over all or part of the length of the threaded rod.

The attachment means of the blocking device are for example in an embodiment in the form of pins extending longitudinally and the additional attachment means are in the form of blind bores made in the nut with the periphery of its thread.

In another embodiment, the attachment means of the locking device and the complementary attachment means of the nut form, for example, a bayonet attachment system.

In another embodiment, the hooking means of the locking device and the complementary hooking means of the nut form, for example, a gear type hooking system.

The blocking device is advantageously in the form of an elastic ring. In this way, it is possible to exert an elastic constraint on the fastening means and these are then maintained in cooperation with one another.

To avoid separation of the nut blocking device, it can advantageously be provided that the blocking device also comprises retaining means extending longitudinally in the space left free by the material recess between the nut and the threaded rod. In this embodiment, the retaining means are for example in the form of a harpoon.

According to an advantageous variant, the locking device is held longitudinally against the nut by magnetization.

To limit the overall dimensions of the assembly produced using a bolt as described above, provision is made, for example, for a front face of the nut to have an annular housing for receiving the locking device. In this way, the overall size of the device corresponds only to the size of the screw and its nut.

For better retention of the blocking device in its housing, it is for example possible to provide that the peripheral surface of the housing is grooved and that the peripheral external surface of the blocking device is also grooved.

In an alternative embodiment, the blocking device is a peripheral part which has one or more lugs whose profile, seen from the axis of the screw, has a triangular shape. In this variant, it is possible to provide that the nut has, at the bottom of a housing intended to receive the peripheral part, holes situated at the same distance from the axis of the screw and regularly spaced, the shape of which complements that of the lugs of the locking device, authorizes screwing and prohibits unscrewing.

According to an alternative embodiment, the face presented by the blocking device on the side of the nut has a larger diameter than its opposite face which gives a flared profile to the blocking device and the nut has a receptacle whose flared shape is complementary to that of the blocking device.

According to another alternative embodiment, the locking device is provided on its external contour, with fixing tongues directed towards the outside like a flange, the free part of which is situated on the nut side and the nut has a receptacle whose flared shape accommodates the tabs, which ensures the longitudinal retention of the locking device against the nut while granting it a possibility of recoil.

In another embodiment, it is provided that:

• the peripheral part has one or more lugs whose profile, seen from the longitudinal axis of the screw, has a triangular shape;

-3 • the nut has, at the bottom of a housing intended to receive the locking device, holes located at the same distance from the axis and regularly spaced, the shape of which complements that of the lugs of the locking device, authorizes screwing and prohibits unscrewing.

As a variant, it is also possible to provide that the locking device (or the nut) has a notched profd and cooperates with fins integrated into the nut (resp. To the locking device).

The accompanying drawings illustrate the invention:

Figure 1 is an overview of a screw with a screw head 1 and a threaded rod 2 having a longitudinal material removal 3. Here the material removal is in the form of a flat which extends from the free end of the threaded rod 2 to the head of the screw 1.

FIG. 2 represents a nut intended to cooperate with the screw of FIG. 1 and to couple with the locking device of FIG. 3.

Figure 3 shows a locking device that blocks any possibility of rotation relative to the screw. A pairing between the locking device and the nut is made possible by a male-female system, the female part being here represented by holes 4 (preferably blind) made at the periphery of the thread on a front face of the nut. .

FIG. 3 shows an embodiment of the blocking device in which the latter is a peripheral part whose profile is adapted to that of the rod and which therefore cannot rotate around the latter. The rotation lock is communicated to the nut when this peripheral part is paired with the nut, provided here by asperities or pins 5 formed on a transverse face of the peripheral part forming the blocking device. This peripheral part here has a substantially annular shape. Its inner surface is of a shape adapted to the outer surface of the threaded rod 2 with its flat 3. There is thus also a flat inside the peripheral part. The outer surface thereof is for example circular.

FIG. 4 shows a peripheral part and a nut in which a material removal has been carried out to reveal additional profds in the form of gears, the number of notches on the nut or on the peripheral part being able to be reduced .

Figure 5 shows the addition to the part of Figure 3, an element intended to be inserted in the space left free between the threaded rod of the screw and the nut when the latter is coupled to the rod screw, and the purpose of which is to hang onto the screw thread of the nut thanks to the asperities 6 forming a harpoon. This harpoon can be added to the piece in Figure 4.

FIG. 6 illustrates a peripheral part, the function of which is similar to that of the part in FIG. 5, composed of two parts 7 acting like a spring and ensuring that the peripheral part of FIG. 3 is kept in translation when the blocking device, or peripheral part, is attached (pins of the blocking device in the blind holes of the nut) to the nut.

FIG. 7 illustrates an element 8 fixed to the peripheral part and playing the same role of spring as the element in two parts 7 of FIG. 6. The element 8 fits in the space existing between the threaded rod 2 and the 'nut through streaks 9 which hang on the thread of the nut.

FIG. 8 shows the nut and an alternative embodiment of a peripheral part which is split in order to give it an elasticity allowing it to be radially compressed or relaxed and to exert on the nut a lateral pressure, thus ensuring its longitudinal retention against the nut when the pressure is directed towards the outside or against the screw rod when the pressure is directed towards the inside.

FIG. 9 is an overall view of the bolt, the peripheral part of FIG. 8 of which has grooves which strengthen its hold against the nut. Similar streaks can also be made on the part of the nut in contact with them.

FIG. 10 shows the bolt with a castellated nut 10 and a peripheral part comprising protuberances 11 coming to hang on the slots of the nut. The number of protrusions or the number of slots can be reduced. The slots and protrusions are in the form of hooks so as to produce a system for attaching the locking device to the nut, in the form of a peripheral bayonet-type part.

FIG. 11 illustrates a variant of a peripheral part of FIG. 3 or of FIG. 8, in which the pins have been replaced by hooks 12 adapted to the geometry of the nut of FIG. 13.

FIG. 12 is a nut whose front face has been hollowed out to adapt to a peripheral part, not shown, in which the pins of FIG. 6 have a rectangular profile.

FIG. 13 is a close-up of a nut with a circular recess 13 and recesses at regular intervals 14 intended to receive the hooks of FIG. 11.

Figure 14 shows a rectangular plate with protrusions having been cut out. This plate can be folded to make a blocking device in the form of a peripheral part as illustrated in FIG. 15. In this embodiment, there is a substantially annular peripheral part, but here both the inner surface of the peripheral part and its outer surface. each have in a same area a flat corresponding to the flat 3 of the threaded rod 2.

FIG. 16 is an exploded view of a nut and of a peripheral part integrated into the nut. The teeth 15 have a triangular profile, like the holes formed in the nut.

Figure 17 is a sectional view of Figure 16 and illustrates the flared profile of the peripheral part and its passenger compartment.

FIG. 18 is a peripheral part comprising teeth with a triangular profile 16 as well as fixing tabs 17 which are received in the flared profile of the nut of FIG. 16.

FIG. 19 and its enlargement 20 show a bolt with a notched peripheral part 18 cooperating with a set of fins 19 fixed to the nut.

FIG. 21 shows a method of use consisting of inserting the nut so that the peripheral part is on the side of the head of the screw in order to make unscrewing impossible.

The bolt described in this invention is based on a simple principle and implementation. It is composed of a screw whose fdetée rod 2 has a longitudinal material removal 3 (for example a flat) and of a nut cooperating with a peripheral part whose profile corresponds to that of the rod and which prevents any rotation. The coupling between the nut and the locking piece is achieved thanks to their complementary shapes.

To implement the device in its basic version, first tighten the nut, then insert the sliding peripheral part until it contacts the nut. The nut is then turned slightly so that the pins 5 of the peripheral part penetrate into the holes 4 of the nut. A very slight additional rotation in the direction of unscrewing ends up blocking the peripheral part which can no longer move back. Any loosening is then impossible, unless the peripheral part is removed.

In the event of strong vibrations, if it is feared that the peripheral part which is slidably mounted on the threaded rod, will eventually escape despite the friction which holds it against the nut, several variants of this invention are summarized below. below:

• Sliding part with circlip effect (or “with lateral compression” or “open” or “with spring effect”) (fig 8)

The profile of the peripheral part is split and it has two ends, which gives it a radial elasticity. According to an advantageous characteristic, the external diameter of the peripheral part is very slightly greater than that of the space in which it is inserted in the nut and it is necessary to compress it radially to insert it. The peripheral part is thus firmly held. According to another advantageous characteristic, additional ridges in the parts in contact reinforce the longitudinal retention of the sliding part.

• Longitudinal support by hooks.

The hooks ensure the locking of the sliding part both in rotation and in translation. They can be integrated into the nut (fig 10) or the locking device (fig 11).

• Longitudinal support by clips or by force

In a version of the invention not shown, the peripheral part and the nut are clipped. One can also have recourse to all the means specific to plastics to secure two parts.

• Magnetic longitudinal hold.

In the case of metal parts, the nut and / or the sliding part can be magnetized in order to ensure good longitudinal support of the sliding part.

• Longitudinal support by tabs.

The sliding part can be increased by an additional part which slides into the tunnel between the screw rod and the nut. This additional part allows a

-6 non-permanent attachment either by chamois effect (fig 5) or by spring effect (fig 6). External tabs can also be added to the periphery of the sliding part (fig 18).

Finally, the following four versions of the invention have all-in-one bolts in which the peripheral part is housed inside the nut and remains there permanently, except for unscrewing which requires removal of the part device that forms the blocking device.

• In a version extending the idea of the peripheral part with circlip effect (Figures 16 and 17), the lugs of the peripheral part have a triangular profile. When the nut is not screwed, the lugs take place in corresponding holes in the nut and the peripheral part is kept pressed against the nut thanks to its flared shape. When screwing, it will not prevent rotation, but will make jolts each time a hole is passed.

• In a second version (fig 18), the peripheral part is held against the nut while being able to deviate there a little, thanks to flexible tongues directed towards the outside and coming to bear against an opening of flared shape made in the nut (fig 16).

• In a third version not shown, the peripheral part and the nut are held by an elastic or spring connection.

• In a fourth version (fig 19 and 20), the sliding part has a notched profile and cooperates with flexible fins integrated into the nut. The fins pass over the notches during screwing and are blocked during unscrewing.

An additional advantage provided by this invention is the possibility of carrying out an irreversible screwing ensuring the sealing function (fig 21). The nut is then screwed with the peripheral part facing the head of the bolt.

Finally, there is a simple and inexpensive method for manufacturing a sliding part (fig 14 and 15): it suffices to fold a strip of material cut to the desired profile.

The industrial applications of the invention extend to all areas where bolts need to be kept in place, essentially for safety reasons such as in the fields of transport (aeronautics, rail, shipbuilding), nuclear, of the building ... but also for general public applications (furniture, household appliances ...).

Claims (10)

1. Bolt comprising a screw with a threaded rod and a nut, characterized in that the threaded rod has a material removal over at least part of its length, in that the bolt further comprises a device for locking in rotation and in translation of the nut extending over at least part of the periphery of the threaded rod and comprising on the one hand a zone of shape complementary to the threaded rod at the level of removal of material and on the other hand attachment means cooperating with additional attachment means made on the nut. 2. Bolt according to claim 1, characterized in that the removal of material from the threaded rod of the screw forms a flat on said rod. 3. Bolt according to one of claims 1 or 2, characterized in that the hooking means of the locking device are in the form of pins extending longitudinally and in that the complementary hooking means are in the form of blind bores made in the nut at the periphery of its thread. 4. Bolt according to one of claims 1 or 2, characterized in that the attachment means of the locking device and the complementary attachment means of the nut form a bayonet attachment system. 5. Bolt according to one of claims 1 to 3, characterized in that the locking device is in the form of an elastic ring. 6. Bolt according to one of claims 1 to 4, characterized in that the blocking device further comprises retaining means extending longitudinally in the space left free by the material recess between the nut and the threaded shaft. 7. Bolt according to claim 6, characterized in that the retaining means are in the form of a harpoon. 8. Bolt according to one of claims 1 to 7, characterized in that the locking device is held longitudinally against the nut by magnetization. 9. Bolt according to claim 1, characterized in that a front face of the nut has an annular housing for receiving the locking device. 10. Bolt according to claim 9, characterized in that the peripheral surface of the housing is grooved and in that the peripheral external surface of the locking device is also grooved. 1/11