FR2812043A1 - Nut and threaded shank assembly device comprises ring which holds nut on shank, shank comprises splines and nut has crown with axial retaining groove and toothed sector - Google Patents

Abstract

The assembly device comprises a threaded shank (1), a nut which is screwed on the shank to hold a part (4) and a ring (3) which holds the nut on the shank. The shank has several splines (11) and the nut has a crown (20) with an axial retaining groove (21) and a toothed sector (221). The ring has several spigots (31) engaged in the splines to lock rotation. An axial retaining stop (30) and a toothed sector (331) engage the crown. There are several radial elastic expansion parts (5) which engage the stop and the groove to hold the ring axially fixed relative to the crown.

Description

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  The present invention relates to an assembly device, of the type which includes a substantially cylindrical threaded barrel extending along an axis, a nut screwed onto a free end of the barrel, and a nut retaining ring on the barrel. , coaxial with the nut. Such devices are known in mechanics and widely used to avoid the risk of unscrewing

nut accidental.

  In the case where this risk is high and must imperatively be ruled out, it is frequent to have recourse to a pin which crosses the barrel, that is to say a device of a different type, which poses by construction problems of balancing when the barrel belongs to a driven organ

in rotation, such as a tree.

  In this context, the invention aims to provide an assembly device of the type defined above, in which the accidental unscrewing of the nut is completely removed. To this end, the device of the invention, moreover in accordance with the generic definition given in the preamble above, is essentially characterized in that the barrel has at least one groove parallel to the axis and opening out to the free end of the barrel, in that the nut has an at least partially cylindrical crown, facing the free end of the barrel and comprising a circular axial retaining groove and at least a first toothed sector, in that the ring has at least one radial lug, selectively engaged in the groove by axial translation to block the ring in rotation relative to the barrel, an axial retaining stop, and at least a second toothed sector, in that the first and second toothed sectors cooperate to maintain the ring, relative to the crown, in a relative position chosen from a multitude of positions

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  possible relative rotation about the axis, and in that this device further comprises at least one first member with radial elastic expansion, cooperating with the stop and with the groove to selectively hold the ring, relative to the crown, in a relative position of fixed translation

along the axis.

  Preferably, at least one of the first and second

  toothed sectors has an angular amplitude of 360 degrees.

  In order to allow easy mounting of the ring, it is advantageous to ensure that the positions of the multitude of possible relative positions of rotation around

  of the axis are in number at least equal to one hundred.

  According to a first possible embodiment of the invention, it is made so that the ring is substantially cylindrical and selectively disposed around the crown, that the axial retaining groove is formed on an external periphery of the crown, that the stop axial retention comprises an internal shoulder of the ring, and that the first member with radial elastic expansion consists essentially of an open elastic ring, engaged in the groove and selectively supported on

the internal shoulder of the ring.

  The internal shoulder can then, for example, be at least partially formed by an edge of the second sector

toothed.

  According to a second possible embodiment of the invention, it is made so that the crown has a substantially cylindrical internal surface and radially distant from the barrel to allow the ring to be inserted between the barrel and the internal surface of the crown , that the axial retaining groove is hollowed out in the internal surface of the crown, that the ring comprises at least one first elastic tongue, folded back on itself and formed of a

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  branch linked to the ring, a hairpin loop, and a free branch of which a free end points away from the axis, that the axial retaining stop is essentially constituted by the free end of the free branch of the tongue, and that the first organ to

  radial elastic expansion is constituted by the tongue.

  In this case, the radial lug is advantageously

  formed by the loop of the tongue itself.

  The ring may also include a second elastic tongue diametrically opposite the first and symmetrical with the first tongue with respect to a median axial plane

of the barrel.

  Alternatively, the ring may have more than two tabs, for example arranged regularly around the axis X. To allow easy mounting and dismounting of the ring, the respective free branches of the first and second tabs are preferably pierced with holes

respective grip.

  To further perfect the balancing of the device, the nut can be essentially cylindrical and have

gripping grooves.

  Other characteristics and advantages of the invention

  will emerge clearly from the description made of it

  below, by way of indication and in no way limitative, with reference to the accompanying drawings, in which: - Figure 1 is a perspective view of an assembly device according to a first embodiment of the invention, shown in assembly course and accompanied by a nut tightening key; - Figure 2 is a perspective view of the assembly device illustrated in Figure 1, shown in a more advanced assembly phase;

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  - Figure 3 is a perspective view of the assembly device illustrated in Figures 1 and 2, shown after assembly; - Figure 4 is a perspective view of three elements of the assembly device illustrated in Figures 1 to 3; - Figure 5 is a partial sectional perspective view of the assembly device illustrated in Figures 1 to 4, after assembly; - Figure 6 is an enlarged partial sectional view of the three elements of the assembly device which are illustrated in Figure 4, shown after assembly; - Figure 7 is an exploded perspective view of an assembly device according to a second embodiment of the invention; - Figure 8 is a perspective view of the assembly device of Figure 7, shown after assembly; and - Figure 9 is an enlarged view in partial section and in perspective of the assembly device of Figures 7 and

8, shown after assembly.

  For an optimal understanding of the inventive concept, the elements illustrated in the different figures and ensuring the same general function are identified by

identical references.

  The invention relates generally to a device of the screw-nut type, which allows the maintenance of any part engaged on the screw, and which comprises means suitable for

avoid loosening the nut.

  More specifically, this device essentially comprises a threaded barrel 1, a nut 2, and a retaining ring 3, the assembly making it possible for example to make a

  annular part 4 integral with the barrel 1.

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  The threaded barrel 1, which possibly belongs to a rotating shaft, is substantially cylindrical and extends along a longitudinal axis X. The nut 2 is screwed onto the free end 10 of the barrel, and the retaining ring 3 is coaxial with nut 2 and maintains

the latter on the barrel.

  According to a first aspect of the invention, the barrel 1 has one or more grooves, such as 11 and 12, which extend parallel to the axis X and which open at

the free end 10 of the barrel 1.

  According to a second aspect of the invention, the nut 2 is at least partially constituted by a crown 20 which is itself

  even at least partially cylindrical, which faces the free end 10 of the barrel, and which comprises on the one hand a circular groove 21 for axial retention and on the other hand one or

  several toothed sectors such as 221.

  According to a third aspect of the invention, the ring 3 has one or more radial lugs such as 31 and 32, each of which is engaged at will, by axial translation, in the corresponding groove of the barrel 1, such as 11 and 12, for block the ring 3 in rotation relative to this barrel, this ring further having an axial retaining stop 30, and one or more toothed sectors such as 331 and 332. According to a fourth aspect of the invention, the toothed sectors of the crown and ring, such as 221 and 331, cooperate so that the ring can be held, relative to the crown, in a relative position chosen from a multitude of possible relative positions of rotation around the X axis, preferably from a number of possible relative positions of rotation at least equal to one hundred.

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  And according to a fifth aspect of the invention, this device further comprises one or more members 5 with radial elastic expansion, which will be described in more detail later, and which cooperate with the stop 30 and with the groove 21 to selectively hold the ring 3, relative to the crown 20, in a relative position of fixed translation along the axis X. To allow the ring 3 to be anchored in rotation on the crown 20 by a torque independent of the relative angular position of the ring and of the crown, at least one of the toothed sectors carried by the ring and the crown, and for example the sector 221 of the crown 20, has a

angular amplitude of 360 degrees.

  The device of the invention is illustrated in two

  possible and nonlimiting embodiments.

  In the first embodiment, illustrated in FIGS. 1 to 6, the ring 3 adopts a substantially cylindrical shape and comes to be mounted around the ring 20, the axial retaining groove 21 possibly being provided on the external periphery of the ring 20, as the

better Figures 2, 4, and 6.

  In this case, the axial retaining stop 30 comprises by

  example an internal shoulder 300 formed on the ring itself

  same (Figure 6), and the radial elastic expansion member 5 is constituted by an open elastic ring 50 (Figure 6), which is engaged in the groove 21 and which comes to bear on the internal shoulder 300 of the ring when this one is

pressed in on the crown.

  To simplify the production of the device, the internal shoulder 300 of the ring can for example be formed by the outermost edge of the toothed sector, or

  each toothed sector, such as 331, worn by the ring 3.

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  The assembly of the assembly device corresponding to this first embodiment is carried out as follows. First of all (figure 1), the part to be held 4 is threaded onto the threaded barrel 1, which in this figure is

  depicted as being formed at the end of a tree.

  Then (FIG. 1) the nut 2 is screwed onto the threaded barrel 1 by means of a key K carrying a standardized drive head T, and provided with reliefs R capable of coming to engage in the gripping grooves, such that 231 and

  232, of the nut 2 to drive the latter in rotation.

  The ring 3 is then approached (FIG. 2) from the free end 10 of the barrel 1 so that the radial lug 31 is opposite the groove 11 of the barrel 1 and begins

to commit to it.

  Finally, the ring 3 is pushed (FIG. 3) according to an axial translational movement and a possible minimal rotation around the axis X, both to allow each toothed sector such as 331 of the ring 3 to mesh with the toothed sector 221 of the crown 20, and to allow the elastic ring 50 (FIG. 6) to come to bear on

  the internal shoulder 300 of the ring 3.

  In the second embodiment, illustrated in FIGS. 7 to 9, the crown 20 has an internal surface 200 (FIG. 9) which is both cylindrical or substantially cylindrical and radially distant from the barrel, so as to allow the ring to be inserted between this surface

internal 200 and the keg 1.

  The axial retaining groove 21 can thus be hollowed out in the internal surface 200 of the crown, as shown

also figure 9.

  The ring 3 in this case comprises two elastic tongues 51 and 52, diametrically opposite one another

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  and symmetrical to each other with respect to an axial plane

median P of the barrel.

  As a variant (not shown), the ring 3 may comprise more than two tongues, regularly distributed around the axis X. Each of these tongues is folded back on itself and formed of two branches connected to one another by a loop. For example, the tongue 51 (FIG. 9) is formed of a branch 310 linked to the ring 3, of a hairpin loop 311, and of a free branch 312 of which a free end 301 points opposite of the X axis. Under these conditions, the axial retaining stop 30 is essentially constituted by the free end of the free branch of each tongue, and each member 5 with radial elastic expansion consists of one of the

tabs 51 and 52.

  For example (FIG. 9), the free end 301 of the free branch 312 of the tongue 51 constitutes an axial retaining stop 30, and the tongue 51 constitutes a member 5 to

radial elastic expansion.

  In addition, each of the radial lugs 31 and 32 is constituted by the loop of the corresponding tongue, the radial lug 31 thus being constituted by the loop 311 of

the tongue 51.

  Finally, the free arms of the tongues 51 and 52 are

  pierced with respective gripping orifices 510 and 520.

  The assembly of the assembly device corresponding to this second embodiment is carried out in the manner

next.

  First (Figure 7), the part to be held 4 is threaded onto the threaded barrel 1, which in Figure 7 is

  depicted as being formed at the end of a tree.

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  Then the nut 2 is screwed onto the threaded barrel 1 by means of a key K identical or equivalent to that described previously with reference to FIG. 1, this key being

then removed after use.

  S The ring 3 is then gripped by inserting the tips S of a clip pliers Q into the holes of

  grip 510 and 520 of the ring 3.

  After tightening of the branches B of the clamp Q, which causes an elastic deformation of the respective loops of the tongues 51 and 52, as well as a bringing together of these tongues, the elastic ring 3 is approached to the free end 10 of the barrel 1 so that the loops such as 311 formed by the tongues 51 and 52 and which constitute radial lugs are respectively opposite the

  splines 11 and 12 of the barrel 1 and begin to engage there.

  The ring 3, still held by the clamp Q, is then pushed in an axial translational movement and any minimal rotation around the axis X, both to allow the toothed sector 331 of the ring 3 to mesh with the toothed sector 221 of the crown 20, and to allow the free ends, such as 301, of the elastic tongues 51 and 52, to face the groove 21

axial retention.

  Finally, the clamping force of the clamp Q is released and the clamp released from the gripping orifices 510 and 520 of the ring, which allows the elastic tabs 51 and 52 to move away from one another elastically, and at the free ends, such as 301, of these tabs, to come to engage

in the axial retaining groove 21.

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Claims (10)

CLAIMS.   1. Assembly device, comprising a substantially cylindrical threaded shaft (1) extending along an axis (X), a nut (2) screwed onto a free end (10) of the barrel, and a retaining ring (3) of the nut on the shank, coaxial with the nut, characterized in that the shank (1) has at least one groove (11, 12) parallel to the axis (X) and opening at the free end (10 ) of the barrel (1), in that the nut (2) has an at least partially cylindrical crown (20), turned towards the free end (10) of the barrel and comprising a circular groove (21) for axial retention and at least a first toothed sector (221), in that the ring (3) has at least one radial lug (31, 32), selectively engaged in the groove (11, 12) by axial translation to block the ring (3) in rotation relative to the barrel (1), an axial retaining stop (30), and at least a second toothed sector (331, 332), in that the first and second toothed sectors (221, 331) c operate to maintain the ring, relative to the crown, in a relative position chosen from a multitude of possible relative positions of rotation about the axis (X), and in that this device further comprises at least one first member ( 5) with radial elastic expansion, cooperating with the stop (30) and with the groove (21) to selectively maintain the ring (3), relative to the crown (20), in a relative position of   fixed translation along the axis (X).   2. An assembly device according to claim 1, characterized in that at least one of the first and second toothed sectors (221, 331) has an angular amplitude of 360 degrees. 3. Assembly device according to any one of   previous claims, characterized in that the   There 2812043 positions of the multitude of possible relative positions of   rotation around the axis are at least one hundred in number.   4. Assembly device according to any one of   previous claims, characterized in that the ring   (3) is substantially cylindrical and selectively disposed around the crown (20), in that the groove (21) for axial retention is formed on an external periphery of the crown (20), in that the stop (30) of axial retainer comprises an internal shoulder (300) of the ring, and in that the first member (5) with radial elastic expansion consists essentially of an open elastic ring (50), engaged in the groove (21) and selectively in abutment sure   the internal shoulder (300) of the ring.   5. Assembly device according to claims 2   and 4, characterized in that the internal shoulder (300) is at least partially formed by an edge of the second toothed sector (331).   6. Assembly device according to any one of   Claims 1 to 3, characterized in that the crown (20)   has an internal surface (200) substantially cylindrical and radially distant from the barrel to allow the ring to be inserted between the barrel (1) and the internal surface (200) of the crown (20), in that the groove (21 ) of axial retention is hollowed out in the internal surface (200) of the crown, in that the ring (3) comprises at least a first elastic tongue (51), folded back on itself and formed of a branch (310) linked to the ring (3), a hairpin loop (311), and a free branch (312), one free end (301) of which points away from the axis (X), that the axial retaining stop (30) is essentially constituted by the free end (301) of the free branch (312) of the tongue (51), and in that the first member 12 2812043   (5) with radial elastic expansion consists of the tongue (51).   7. An assembly device according to claim 6, characterized in that the radial lug (31) is constituted by the loop (311) of the tongue (51). 8. Assembly device according to any one of   Claims 6 and 7, characterized in that the ring (3)   comprises a second elastic tongue (52) diametrically opposite the first (51) and symmetrical with the first   tongue relative to a median axial plane (P) of the barrel.   9. An assembly device according to claim 8, characterized in that the free branch (312, 322) of each tongue (51, 52) is pierced with an orifice (510, 520) for gripping. 10. Assembly device according to any one   of the preceding claims, characterized in that the nut   (2) is essentially cylindrical and has grooves grip (231, 232).