Hooking device between a stringer frame and a lever and method of lubricating such a device

Abstract

Attachment device between a heald frame and a lever and method for lubricating such a device Attachment device comprising a fastener (8) configured to be secured to a heald frame, and comprising two flanges (12, 12'), an inner ring (16) mounted between the flanges, and provided with orthoradial slots (16C) formed on its external peripheral surface (16B), and a ring with a polygonal profile (14) comprising a greaser (24) and a bore (15) to be mounted in rotation around the inner ring. The attachment device comprises a hook, with a locking member capable of holding the hook in cooperation with the ring with a polygonal profile. According to the invention, the ring with a polygonal profile (14) comprises grooves (30) for receiving a lubricant, formed on the surface (15A) of its bore (15). Figure for the abstract: Figure 5

Description

Title of the invention: Device for attachment between a stringer frame and a lever and method for lubricating such a device

[0001] The present invention relates to a hooking device between a heald frame and a lever actuated by a shed forming machine. The invention also relates to a method of lubricating such a hooking device.

[0002] To simplify the operations of mounting and dismounting the heddle frames on a loom, it is known to use semi-automatic hooking devices.

[0003] Such hooking devices are described in EP 0 117 826 A1, FR 2 815 047 and EP 2 586 895 A1. The devices comprise an open hook configured to cooperate with a polygonal ring. The polygonal ring is coupled to a horizontal crosspiece of a stringer frame by means of flanges. The hook, connected to a lever actuated by a weave mechanism, cooperates with the polygonal ring through its opening. The engagement of the hook with the polygonal ring is ensured by a locking member carried by the hook.

[0004] In a known manner, a pulling mechanism comprises a set of connecting rods and oscillating levers actuated by a shedding machine. The transmission forces between the levers of the pulling mechanism and the heald frames are transmitted to the hooking devices, in particular by the contact surfaces between the hook and the polygonal ring. To best distribute the forces, the contact surfaces have been maximized but their size is limited by the fact that the ring is coupled to the heald frame and therefore cannot have a thickness greater than that of the heald frame.

[0005] The attachment devices of FR 2 815 047 and EP 2 586 895 A1 also include lubrication circuits making it possible to slow down the wear of the mechanical parts subjected to the forces of the stringer frame.

[0006] Certain weaving applications, such as the weaving of wide-ribbed fabrics or weaving regimes which cause high accelerations of the heddle frames, generate significant forces from the heddle frames on the hooking devices which induce premature wear of the mechanical parts of the known hooking devices. The wear of the hooking devices causes noise and vibration phenomena which do not allow correct use of the loom.

[0007] The invention aims to remedy this drawback by providing a new attachment device having less wear on the mechanical parts which provide the connection between the heald frame and the lever of the drawing mechanism actuated by the shed forming machine.

[0008] The subject of the invention is a device for attachment between a heald frame and a lever actuated by a shed forming machine of a loom comprising a fastener configured to be secured to a heald frame and comprising two flanges respectively comprising internal walls, facing one another, and external walls, opposite one another, an inner ring mounted between the internal walls of the two flanges, around a first axis of the attachment device perpendicular to the two flanges and provided with a first slot and a second slot formed on its external peripheral surface and a ring with a polygonal profile mounted to rotate around the inner ring in an angular indexing position and comprising a bore intended to receive the inner ring, a greaser comprising a lubrication channel, radial to the first axis,opening through an orifice on the bore of the ring with a polygonal profile and two flanks mounted between the internal walls of the flanges and parallel to the internal walls of the flanges. The hooking device also comprises a hook, configured to cooperate with the ring with a polygonal profile and comprising a hook opening, two flanks between which is defined a hook thickness measured parallel to the first axis when the hook is in a position engaged on the ring with a polygonal profile, a locking member capable of holding the hook in cooperation with the ring with a polygonal profile when the hook is in the engaged position. According to the invention, the ring with a polygonal profile comprises grooves for receiving a lubricant, arranged on the surface of its bore.

[0009] Thanks to the invention, the inner surface of the polygonal ring is supplied through the grooves with a lubricating agent, which slows down its wear and allows better resistance to significant frame forces.

[0010] According to other advantageous aspects of the invention, the attachment device comprises one or more of the following characteristics, taken individually or in all technically possible combinations:

[0011] - the grooves of the ring with polygonal profile extend along the first axis of the hooking device and over the entire thickness of the ring with polygonal profile, between its two sides.

[0012] - at least part of the grooves of the ring with polygonal profile is distributed, ortho- dially around the first axis of the device, on either side of the orifice of the lubrication channel of the greaser of the polygonal profile ring.

[0013] - the ring with polygonal profile comprises on its bore: a first set of grooves distributed over a first angular sector, and a second set of grooves distributed over a second angular sector.

[0014] - in an angular indexing position of the ring with polygonal profile, the first angular sector is opposite the first slot of the inner ring and the second angular sector is opposite the second slot of the inner ring.

[0015] - the first angular sector and the second angular sector each comprise: at least one first groove having a first depth, at least two second grooves having a second depth smaller than the first depth and arranged on either side of each first groove, and surface portions of the bore of the ring with a polygonal profile in contact with the peripheral external surface of the inner ring arranged, in a direction orthoradial to the first axis, each between two grooves.

[0016] - the first slot and the second slot provided on the outer peripheral surface of the inner ring are diametrically opposed.

[0017] - the inner ring comprises a first through channel including a first orifice opens at the center of the first slot and a second through channel of which a first orifice opens at the center of the second slot, the center of a slot being defined as the middle of the orthoradial extent around the first axis of said slot.

[0018] - in an angular indexing position of the ring with polygonal profile, the first and the second set of grooves of the ring with polygonal profile are distributed, ortho-radially to the first axis, symmetrically with respect to the first orifice of each through channel of the inner ring.

[0019] - the first set of grooves and the second set of grooves are each extended orthoradially around the first axis of the device over an angular sector with an apex angle greater than or equal to 40°, preferably greater than or equal to 60°, more preferably greater than or equal to 100°.

[0020] - each flange of the fastener comprises: a mounting wall configured to resting on the stringer frame, a guide wall configured to guide the sides of the polygonal profile ring, perpendicular to the first axis, extending between the mounting wall and a lower edge of the flange and defining a guide plane for the polygonal profile ring, and projecting surfaces of the guide wall, on the side of the internal walls, defining a space intended to receive the hook and configured to laterally guide the sides of the hook in the engaged position of the hook.

[0021] - a guide spacing of the ring between the two guide walls of the two flanges, measured along the first axis, is strictly greater than a distance between the projecting surfaces of the two flanges, measured along the first axis.

[0022] - the guide wall of each flange extends over a larger surface area that the area of ​​the surface delimited by a circumscribed circle of the projection of the polygon of the polygonal profile of the ring with polygonal profile on the flange and including the surface delimited by said circumscribed circle.

[0023] - at least two of the bearing surfaces of each of the flanges are provided outside the circumscribed circle of the projection of the polygon of the polygonal profile of the profile ring polygonal on the guide wall.

[0024] - each guide wall comprises at least one first receiving groove formed between two of the guide bearing surfaces, the first receiving groove being configured to receive an indexing relief of the polygonal profile ring and to limit rotation of the polygonal profile ring around an indexing position.

[0025] - at least one of the bearing surfaces of each of the flanges comprises a localized boss between the first axis and the mounting wall of the flange.

[0026] - the boss is oblong.

[0027] - the largest dimension of the boss extends perpendicular to a plane of reference containing the first axis and a second axis perpendicular to the first axis which passes through the lower edge of the flange.

[0028] - the boss is symmetrical with respect to the reference plane.

[0029] - each guide wall comprises a second receiving groove formed between two of the guide surfaces and symmetrical to the first receiving groove relative to the reference plane, the second receiving groove being configured to receive an indexing relief of the polygonal profile ring and to limit the rotation of the polygonal profile ring around an indexing position.

[0030] - the bearing surfaces of the guide wall of the first flange define a first plane of guiding the hook parallel to the guide wall of the first flange.

[0031] - the bearing surfaces of the guide wall of the second flange define a second hook guide plane parallel to the guide wall of the second flange.

[0032] - a spacing between the first hook guide plane and the second hook guide plane hook guide is equal to the thickness of the hook.

[0033] - a distance, measured along the first axis, between the mounting walls of the two flanges is less than the guide spacing of the polygonal profile ring.

[0034] - the ring with polygonal profile has a constant thickness, measured along the first axis as the distance between the two sides of the ring with polygonal profile.

[0035] - the constant thickness of the ring with polygonal profile is greater than the thickness of the hook.

[0036] The invention also relates to a method for lubricating a hooking device as previously described comprising at least the following steps: a. unlocking the hook from the ring with polygonal profile by means of the locking member, b. disengage the hook from the polygonal profile ring, c. supply lubricant to the grooves of the polygonal profile ring via the channel lubrication by means of an external lubrication device, d. drive the polygonal profile ring into rotation about the inner ring, the rotation relative to the indexing position of the polygonal profile ring having an angular amplitude of less than 180°, preferably less than 90°, preferably less than 70°.

[0037] The invention will appear more clearly on reading the description which follows, given solely by way of non-limiting example, and made with reference to the drawings in which:

[0038] [Fig-1] [Fig. 1] is a partial front view of a rail frame comprising three attachment devices in accordance with the invention,

[0039] [Fig.2] [Fig.2] is a front view of a hooking device of [Fig.l], then that the hook is not engaged with the polygonal ring, insert A shows the polygonal ring in the indexing position and insert B out of an indexing position,

[0040] [Fig.3] [Fig.3] is a front view of a hooking device of the [Fig.l] with partial tearing, while the hook is engaged with the polygonal ring and the locking member is in the locked position,

[0041] [Fig.4] [Fig.4] is a view similar to [Fig.3] showing the locking member in unlocked position,

[0042] [Fig.5] [Fig.5] is an exploded perspective view of an ap upright attachment belonging to a hanging device of figures 1 to 4,

[0043] [Fig.6] [Fig.6] is a front view of a wear measuring device in progress in use, insert A shows the measuring device when wear is normal, and insert B when wear is abnormal.

[0044] [Fig.l] shows a partial view of a heald frame 2 on which several hooking devices 4, 4' are mounted, making it possible to connect the heald frame 2 to a lever of a pulling mechanism actuated by a shed-forming machine such as a dobby (not shown). In the example illustrated, two hooking devices 4 are mounted on uprights 2A of the heald frame 2 and a device 4' is mounted on a horizontal bar 2B mounted on the crosspiece 2C of the heald frame 2.

[0045] The following description is given for the hooking devices 4 mounted on the uprights 2A of the stringer frame 2.

[0046] As illustrated in Figures 2, 3 and 4, the hooking device 4 comprises a fastener 8 configured to be secured to the uprights 2A of the rail frame 2 and a hook 10 configured to cooperate with the fastener 8, the hook 10 being mechanically connected to a lever of the pulling mechanism.

[0047] The fastener 8, shown exploded in [Fig.5], comprises two identical flanges 12, 12', a ring with a polygonal profile 14, an inner ring 16 and a central rivet 18.

[0048] The flanges 12, 12' are arranged opposite each other and are mounted by means of rivets 20 on the stringer frame 2. The rivets 20 are placed at the level of openings 21 and 21' respectively provided in the flanges 12 and 12'. The flanges 12, 12' are, for example, sheets. The flanges 12, 12' have a generally triangular shape. rounded isosceles. The flanges 12, 12' each comprise an internal wall, only the internal wall 12A of the flange 12 is visible in [Fig.5], and an external wall, only the external wall 12'B of the flange 12' is visible in [Fig.5]. In the mounted configuration of the attachment device 4 on the stringer frame 2, the internal walls 12A are placed on either side of the upright 2A of the stringer frame 2 and are opposite each other.

[0049] The ring with a polygonal profile 14 is arranged between the internal walls 12A of the flanges 12, 12'. The ring with a polygonal profile 14 is mounted with the possibility of rotation around the inner ring 16. The inner ring 16 is mounted around the central rivet 18 and fixed in position relative to the attachment 8. The central rivet 18 secures all of the elements forming the attachment 8 and permanently maintains the orientation of the inner ring 16 in the attachment 8.

[0050] The central rivet 18 is positioned at a circular opening 22, 22' respectively of the flanges 12, 12'. The central rivet 18 is cylindrical in shape. Advantageously, the diameter of the central rivet 18 is between 24 millimeters and 26 millimeters, preferably is equal to 25 millimeters.

[0051] A first axis XI of the attachment device 4 is defined as the axis of the central rivet 18. A second axis X2 of the attachment device 4 is defined as an axis of symmetry of the flange 12, the second axis X2 being perpendicular to the first axis XL. Similarly, a third axis X2' of the attachment device 4 is defined as an axis of symmetry of the flange 12' parallel to the second axis X2.

[0052] The central rivet 18 is hollow and has on its external peripheral surface 18A a groove 18B. The thickness of the central rivet 18 is defined as the extent along the axis XI of the central rivet 18. The groove 18B is preferably centered on the thickness of the central rivet 18.

[0053] The inner ring 16 is cylindrical in shape and comprises a bore 16A which receives the central rivet 18. The inner ring 16 comprises two opposite annular flanks around the bore 16A. Only the flank 16E is visible in [Fig.5]. Advantageously, the external diameter of the inner ring 16 is between 35 millimeters and 45 millimeters, preferably is equal to 40 millimeters. The inner ring 16 is secured to the rivet 18 around the first axis XL. The annular flanks of the inner ring 16 are mounted between and parallel to the internal walls 12A of the flanges 12, 12'.

[0054] Two slots 16C and 16D are provided on the outer peripheral surface 16B of the inner ring 16. Preferably, the two slots 16C and 16D are diametrically opposite. Each slot 16C, 16D extends orthoradially to the first axis XI over an angular section whose apex angle a is between 110° and 130°, preferably equal to 120°. In other words, each slot 16C, 16D extends along a respective axis, parallel to a tangent to the outer peripheral surface 16B.

[0055] The inner ring 16 comprises two through channels 161, 162 visible in [Fig. 3]. By through channel is meant a channel which extends radially, relative to the first axis XI, between the bore 16A and the external peripheral surface 16B of the inner ring 16.

[0056] A first orifice 161A of the first through channel 161 opens into the first slot 16C and a second orifice 161B of the first through channel 161 opens into the bore 16A. A first orifice 162A of the second through channel 162 opens into the second slot 16D and a second orifice 162B of the second through channel 162 opens into the bore 16A.

[0057] The center of a slot 16C, 16D is defined as the middle of the extent orthoradial to the first axis XI of this slot. Preferably, the first orifice of the first through channel 161 opens at the center of the first slot 16C and the first orifice of the second through channel 162 opens at the center of the second slot 16D.

[0058] The ring with a polygonal profile 14 is mounted to rotate freely around the inner ring 16. The flanks, in particular the flank 14A, of the ring with a polygonal profile 14 are mounted between and parallel to the internal walls 12A of the flanges 12, 12', only the flank 14A of the ring with a polygonal profile 14 is visible in [Fig. 5]. The flanks, in particular the flank 14A, are in plane-to-plane contact with the internal walls 12A of the flanges 12, 12.

[0059] The polygonal profile ring 14 has a polygonal section in a plane perpendicular to the first axis XL. Preferably, the section of the polygonal profile ring 14 is substantially hexagonal. Preferably, the section is defined by an irregular polygon.

[0060] The thickness of the ring with polygonal profile 14, defined as the distance along the first axis XI between the two sides 14A of the ring with polygonal profile 14, is constant over the entire ring 14 and is between 6 millimeters and 8 millimeters, preferably equal to 7 millimeters.

[0061] The thickness of the inner ring 16 is substantially equal to the thickness of the polygonal profile ring 14. The thickness of the central rivet 18 is substantially equal to the thickness of the inner ring 16.

[0062] The polygonal profile ring 14 comprises a bore 15.

[0063] The polygonal profile ring 14 is made by injection molding of self-lubricating plastic material. Alternatively, the polygonal profile ring is made of another material, for example a thermoplastic such as polyetheretherketone (PEEK) or manufactured using a process other than plastic injection molding.

[0064] The polygonal profile ring 14 is in one piece and includes a greaser 24. The greaser 24 makes it possible to lubricate the contact zone between the polygonal profile ring 14 and the inner ring 16. The greaser 24 extends radially to the first axis XI and comprises a lubrication channel 241 opening through an orifice 241A onto the bore 15. The lubricator 24 comprises a lubrication nozzle 242 for supplying the lubrication channel 241 with lubricant.

[0065] The polygonal profile ring 14 can rotate about the first axis XI, so that the greaser 24 can be arranged in the position shown in solid lines in Figures 2 and following, called the 0° indexing position, or in the position shown in dotted lines on the insert A) of [Fig.2], called the 180° indexing position. The choice of the 0° or 180° indexing position is made according to the intended direction of cooperation with a hook 10. In [Fig.l], the polygonal profile ring 14 for connecting the left upright 2A of the heald frame 2 is in a 0° indexing position, while the polygonal profile ring 14 for connecting the right upright 2A of the heald frame 2 is in a 180° indexing position.

[0066] Flanks 24A of the lubricator 24 are in continuity respectively with the flanks 14A of the polygonal profile ring 14. Each flank 24A of the lubricator 24 comprises an indexing relief 26, projecting relative to this flank 24A.

[0067] The bore 15 of the polygonal profile ring 14 comprises on its surface 15A grooves 30 intended to receive lubricant. The grooves 30 of the polygonal profile ring 14 extend along the first axis XI and over the entire thickness of the polygonal profile ring 14. In other words, the grooves 30 connect the flanks 14A of the polygonal ring 14.

[0068] As illustrated in [Fig.5], the grooves 30 are distributed into two sets 30A, 30B. Each set 30A, 30B comprises four grooves 30. Each set of grooves 30A, 30B extends orthoradially to the first axis XI over an angular sector whose apex angle [3 is greater than or equal to 40°, preferably greater than or equal to 60°, more preferably greater than or equal to 100°. In other words, the sets of grooves 30A, 30B extend over the surface 15A over an angular sector centered on the axis XL. The sets 30A and 30B are diametrically opposite relative to the first axis XL. The first set 30A is distributed orthoradially to the first axis XI on either side of the orifice 241A of the lubrication channel 241, in a symmetrical manner.

[0069] When the polygonal profile ring 14 is placed in its 0° indexing position, the first set of grooves 30A faces the first slot 16C of the inner ring 16 and the second set of grooves 30B faces the second slot 16D of the inner ring 16.

[0070] Preferably, the set 30A of grooves 30 is distributed symmetrically orthoradially to the first axis XI, on either side of the first orifice 161A of the first through channel 161 of the inner ring 16. Similarly, the set 30B of grooves 30 is distributed on either side of the first orifice 162A of the second channel passing through 162 of the inner ring 16.

[0071] Symmetrically, when the polygonal profile ring 14 is placed in its 180° indexing position, the first set of grooves 30A is opposite the second slot 16D and the second set of grooves 30B is opposite the first slot 16C.

[0072] The two sets of grooves 30A and 30B each comprise, and preferably in an identical manner, grooves 30 of different depths. Each set 30A, 30B comprises two grooves 301 having a first depth p1 and two grooves 302 having a second depth p2. The second depth p2 of the grooves 302 is less than the first depth p1 of the grooves 301.

[0073] The grooves 301 and 302 are arranged such that the first and second grooves 301 are adjacent and placed in the center of the angular extension sector of the assembly 30A, 30B. The first groove 302 is adjacent to the first groove 301 and the second groove 302 is adjacent to the second groove 301. In other words, the grooves 302 are placed on either side of the two grooves 301, at the periphery of the angular extension sector of the assembly 30A, 30B. The grooves 30 of each assembly are arranged alternately with portions of the surface 15A of the bore 15 of the ring with polygonal profile 14 in contact with the peripheral external surface 16B of the inner ring 16 in a direction orthoradial to the first axis XL

[0074] In a variant not shown, the two sets of grooves 30A and 30B comprise a single groove 301 having a first depth p1. The two grooves 302 of second depth p2 are then placed on either side of the groove 301.

[0075] The polygonal ring 14 cooperates in the hooking device 4 with the hook 10 to hook the stringer frame 2 to a lever.

[0076] The hook 10 is in one piece with or welded with a rod 6 connected to a first end of a connecting rod to the frame not shown, which comprises a second end articulated on an oscillating lever actuated by a connecting rod of a pulling mechanism of a shedding machine. The lever being able to oscillate during weaving to transmit the movement of the shedding machine to the connecting rod to the frame. The hook 10, visible in [Fig.l] to 4, comprises a head 32 defining an opening 34 for receiving the ring with a polygonal profile 14. The opening 34 is bordered by upper 34b lateral 342, 343 and lower 344 bearing surfaces adapted to come into engagement respectively with the surfaces 14b 142, 143, 144 of the external peripheral surface of the ring with a polygonal profile 14.

[0077] The height h32 of the head 32 of the hook 10 measured between the upper reach 34i and the apex of the head 32 is between 28 millimeters and 32 millimeters, preferably equal to 30 millimeters.

[0078] The thickness of the hook 10, measured as the distance, along the first axis XI, between two flanks 10A and 10B of the hook at the level of the opening 34 when the hook 10 is engaged around the ring with polygonal profile 14, is between 5 millimeters and 7 millimeters, preferably is equal to 6 millimeters.

[0079] The thickness of the hook 10 is less than the thickness of the polygonal profile ring 14. Advantageously, this dimensioning limits the edge effects of the cooperation surfaces of the hook on the polygonal profile ring in the engaged position of the hook.

[0080] In a manner known elsewhere, the hook 10 also comprises a branch 36 on which is mounted a lock 38 making it possible to retain the polygonal profile ring 14 in the engaged position of the hook of [Fig.3].

[0081] The lock 38 comprises a surface 381 intended to come into contact with a lateral surface 145 of the ring with a polygonal profile 14. When the surface 381 of the lock 38 is in contact with the lateral surface 145 of the ring with a polygonal profile, the lock 38 is in a locked position which makes it possible to lock the hook 10 onto the ring with a polygonal profile 14.

[0082] The lock 38 comprises a tab 382 whose end 383 has a partly cylindrical external section, such that it can constitute an articulation axis in a cavity formed in the thickness of the branch 36 and delimited by the return 361. In the locked position of the lock as shown in [Fig. 3], the return 361 is engaged inside a slot defined between the tab 382 and a rear part 384 of the lock 38 opposite the surface 381.

[0083] The lock 38 comprises a groove 385 for receiving one end 40A of a compression spring 40, the second end 40B of which is received in a groove 362 formed on the branch 36. The spring 40 is dimensioned such that it permanently exerts a force F1 having a tendency to tilt the lock 38 in the direction of the arrow F2 in [Fig. 3], that is to say to allow the lock 38 to keep the hook 10 engaged on the ring with polygonal profile 14.

[0084] An operating member 42 is formed by a molded plastic part which comprises two flanges 421, 422 connected by a cylindrical axis 423 and by a bottom plate 424. The operating member 42 is also provided with a tab 425 allowing a user to exert a force represented by the arrow F3 of [Fig. 4] tending to tilt the lock from the locked position of [Fig. 3] to the unlocked position of [Fig. 4]. The tab 425 of the operating member 42 comprises an internal lubrication channel 426.

[0085] When the operating member 42 is in place on the lock 38, the flanges 421 and 422 constitute two cheeks which isolate the volume defined between the lock 38 and the branch 36 from the outside so as to be able to contain lubricant which can be introduced by the lubrication channel 426 to facilitate the articulation of the lock 38 on the branch 36.

[0086] The stringer frame 2, the polygonal profile ring 14 and the hook 10 having different thicknesses, the flanges 12 and 12' comprise mounting walls 44, guide walls 46 and projecting surfaces of the guide walls 48, 48' making it possible to adapt the attachment 8 to the different thicknesses and to optimally guide the polygonal profile ring 14 and the hook 10. In [Fig. 5], the mounting walls 44 and guide walls 46 of only one of the flanges, the flange 12, are visible. The mounting and guide walls as well as the projecting surfaces are identical for both flanges 12 and 12'. Advantageously, the flanges 12 and 12' of an attachment are mounted indifferently on one side or the other of the frame.

[0087] The mounting walls 44 are configured to bear on the uprights 2A of the stringer frame 2. The mounting walls 44 are perpendicular to the first axis XL. The mounting walls 44 are provided with the two openings 21, 21' receiving the rivets 20 making it possible to fix the attachment 8 to the stringer frame 2.

[0088] The guide walls 46 make it possible to guide the flanks 14A of the ring with a polygonal profile 14. Each guide wall 46 is perpendicular to the first axis X1 and extends between the corresponding mounting wall 44 and a lower edge 12C, 12'C of the corresponding flange 12, 12'. Each guide wall 46 defines a guide plane for the ring with a polygonal profile 14 which is not shown for the readability of the figures. A guide spacing for the ring with a polygonal profile 14 is defined between the two guide walls 46 of the two flanges 12, 12' measured along the first axis X1. The lower edge 12C, 12'C of each flange 12, 12' is rounded in shape and extends over an angular sector centered on the first axis X1.

[0089] The thickness of the uprights 2A of the heald frame 2 being less than the thickness of the ring with polygonal profile 14, each flange 12, 12' has a fold 50, 50' so that when the attachment 8 is mounted on the heald frame 2 the distance, measured along an axis parallel to the first axis XI, between the mounting walls 44 is less than the distance, measured along an axis parallel to the first axis XI, between the guide walls 46. In other words, the distance between the mounting walls 44 makes it possible to receive the uprights 2A of the heald frame 2 and the distance between the guide walls 46 makes it possible to receive the ring with polygonal profile 14 which is thicker than the uprights 2A.

[0090] For each flange 12, 12', the fold 50, 50' between the mounting walls 44 and the guide walls 46 is formed by stamping.

[0091] The guide walls 46 comprise the openings 22 and 22' receiving the central rivet 18.

[0092] The guide walls 46 receiving the flanks 14A of the ring with polygonal profile 14 each extend over a surface area greater than the area of ​​the surface delimited by a circumscribed circle C, C' of the projection of the polygon of the polygonal profile of the ring with polygonal profile 14 on the flange 12, 12'. The guide walls 46 comprise the surface delimited by the circumscribed circle C, C', plus a portion of surface outside this circle.

[0093] As mentioned above, each guide wall 46 comprises guide bearing surfaces 48, 48' projecting from the guide wall 46. The guide bearing surfaces 48, 48' define a space intended to receive the hook 10 and are configured to laterally guide the flanks 10A and 10B of the hook when it is in a position engaged on the polygonal profile ring 14.

[0094] In the illustrated example, the first flange 12 comprises five guide bearing surfaces 48b 482, 483, 484, 485 and the second flange 12' also comprises five guide bearing surfaces 48^, 48^, 48'3, 48'4, 48'5.

[0095] The guide surfaces 48, 48' are arranged outside the circumscribed circle C, C' of the projection of the polygon of the polygonal profile of the ring with polygonal profile 14 on the guide wall 46. The circumscribed circles C, C' define the lower edge 12C, 12'C of the corresponding flange 12, 12'. The lower edge 12C is angularly delimited by the guide surfaces 483 and 484. The lower edge 12'C is angularly delimited by the guide surfaces 48'3 and 48'4. The lower edges 12C, 12'C are devoid of reliefs. The lower edges 12C, 12'C are inscribed on an annular portion of their respective flange 12, 12' which is of constant thickness.

[0096] A reference plane PI is defined containing the first axis XI and the second axis X2. The reference plane PI is a plane of symmetry for each of the flanges 12, 12'.

[0097] On each flange 12, 12', the guide surface 48b 48'i is positioned between the first axis XI and the mounting wall 44. When the hook 10 is in a position engaged with the polygonal profile ring 14, the guide surface 481, 48'i is opposite the head 32 of the hook 10. More precisely, this surface is opposite the area of ​​the head 32 between the upper surface 34i and the apex of the head 32.

[0098] The guide surface 48b 48'i comprises a flat boss. The boss of the guide surfaces 48b 48'i is oblong. The boss is symmetrical with respect to the reference plane PL. The largest dimension of the boss extends perpendicular to the reference plane PL.

[0099] The guide surfaces 482 and 483, arranged on a free lateral edge of the guide wall 46, form between them a first receiving groove 52. The first receiving groove 52 is configured to receive an indexing relief 26 of the polygonal profile ring 14 when it is in the 0° indexing position.

[0100] Symmetrically with respect to the reference plane PI, the guide surfaces 48 4 and 485 form between them a second receiving groove 54. The second receiving groove 54 is configured to receive an indexing relief 26 of the polygonal profile ring 14 when it is in the 180° indexing position.

[0101] The receiving grooves 52, 54 limit the rotation of the polygonal profile ring 14 by constraining the position of the indexing relief 26 within the receiving grooves 52, 54.

[0102] Similarly, the guide bearing surfaces 48'2, 48'3 form a first receiving groove, not shown, on the flange 12' and the guide bearing surfaces 48'4, 48'5 form a second receiving groove, also not shown.

[0103] The guide surfaces 48 of the guide wall 46 of the first flange 12 define a first guide plane of the hook 10, not shown for the readability of the figures. The first guide plane is parallel to the guide wall 46 of the first flange 12 and offset from this wall, on the side of the second flange 12', by the thickness of the guide surfaces 48. In other words, the first guide plane is normal to the axis XL

[0104] The guide surfaces 48' of the guide wall of the second flange 12' define a second guide plane of the hook 10, not shown for the readability of the figures. The second guide plane is parallel to the guide wall 46 of the second flange 12' and offset from this wall, on the side of the first flange 12, by the thickness of the guide surfaces 48'. In other words, the second guide plane is normal to the axis XL

[0105] The spacing between the first guide plane of the hook 10 and the second guide plane of the hook 10, measured along the first axis XI, is equal to the thickness of the hook 10 such that the hook 10 is guided by the guide bearing surfaces 48, 48' when it is in a position engaged on the polygonal profile ring 14.

[0106] The thickness of the hook 10 being less than the thickness of the ring with polygonal profile 14, a distance between the projecting bearing surfaces 48, 48' of the two flanges 12, 12' measured along the first axis XI is strictly less than the guide spacing of the ring with polygonal profile 14.

[0107] The thickness of the uprights 2A of the stringer frame 2 being less than the thickness of the polygonal profile ring 14, a distance, measured along the first axis XI, between the mounting walls 44 of the two flanges 12, 12' is less than the guide spacing of the polygonal profile ring 14.

[0108] The structure of the flanges 12, 12' makes it possible to accommodate the free space between the flanges 12, 12' with the different thicknesses of the stringer frame 2, of the polygonal profile ring 14 and of the hook 10.

[0109] When using the loom comprising the heddle frame 2, the attachment 8 is secured to the uprights 2A of the heddle frame 2. The polygonal profile ring 14 is positioned in an indexing position at 0° or 180°.

[0110] The operator engages the hook 10 on the ring with polygonal profile 14 in such a way that the bearing surfaces 34b 342, 343, 344 of the hook 10 come to be placed respectively opposite the cooperation surfaces 14b 142, 143, 144 of the ring with polygonal profile 14.

[0111] To enable the hook 10 to be engaged on the ring with a polygonal profile 14, the operator exerts a force represented by the arrow F3 on the tab 425 of the operating member 42 against the return force of the spring 40. When the hook 10 is engaged, the operator no longer exerts any force on the operating member 42. The spring 40 exerts the return force F1 enabling the lock 38 to be engaged. The surface 381 of the lock 38 comes into contact with the lateral surface 145 of the ring with a polygonal profile 14. The heald frame 2 can then be actuated by the lever of the pulling mechanism. The hooking device 4 makes it possible to mechanically connect the heald frame 2 and the lever of the pulling mechanism to transmit the lifting or lowering movement to the frame, in order to produce the desired warp yarn sheds in weaving.

[0112] To improve the performance of the hooking device 4, two lubrication methods are implemented: a lubrication method in the engaged position of the hook 10 on the polygonal profile ring 14 and a maintenance lubrication method in the disengaged position of the hook 10 on the polygonal profile ring 14.

[0113] The lubrication method in the engaged position when the polygonal profile ring 14 is in an indexing position at 0° is described below.

[0114] The first step of the lubrication method in the engaged position of the hook 10 is to connect an external lubrication device to the lubrication nozzle 242 of the lubricator 24 to supply lubricant to the lubrication channel 241.

[0115] The lubricant flows through the lubrication channel 241 to the set of grooves 30A of the polygonal profile ring 14 and then through the slot 16C of the inner ring. The lubricant then flows in the channel 161 of the inner ring 16 to the groove 18B of the central rivet 18.

[0116] At the level of the groove 18B of the central rivet, the lubricant travels 180° and reaches the orifice 162B of the channel 162 of the inner ring 16. The lubricant then flows to the slot 16D of the inner ring 16 which is opposite the grooves 30B of the ring with polygonal profile 14.

[0117] This method therefore makes it possible to fill with lubricant all of the contact zones of the fastener 8 and in particular the set of grooves 30B of the ring with a polygonal profile diametrically opposed to the lubricator 24. This method makes it possible to increase the volume of lubricant retention around the inner ring 16.

[0118] The lubrication method is similar when the polygonal profile ring 14 is in a 180° indexing position. The lubricant flows in this configuration from the lubrication channel 241 to the set of grooves 30A then through the slot 16D then in the channel 162 to the groove 18B of the central rivet. By traveling 180° in the groove of the central rivet 18, the lubricant flows through the slot 16C opposite the set of grooves 30B of the polygonal profile ring.

[0119] It is also important to lubricate the contact surfaces which communicate the forces compression of the stringer frame 2 to the lever of the pulling mechanism.

[0120] The greatest forces are exerted on the upper and lower bearing surfaces 34i and 344 of the hook opening 34. The upper and lower bearing surfaces 34i and 344 of the hook 10 are in cooperation with the surfaces 14i and 144 of the external peripheral surface of the polygonal profile ring 14. In other words, the greatest forces are transmitted along an axis parallel to the second axis X2 passing through the center of the central rivet 18. The surfaces 14i and 144 of the external peripheral surface of the polygonal profile ring 14 have larger areas than the areas of the surfaces 142, 143 and 145. In particular, the length of the contact surfaces 14b 144 of the polygonal profile ring 14 with the hook 10 is greater than the length of the contact surfaces 143, 144 measured along a direction orthoradial to the axis XL. length of surfaces 14b 144 is greater than 30mm, preferably greater than or equal to 32mm.

[0121] The surfaces 14b 144 define an edge with each of the flanks 14A of the polygonal profile ring. Preferably, the edges are obtained by machining the flanks of the polygonal profile ring 14. This design optimizes the area of ​​the contact surface of the surfaces 14b 144 in the available space of the attachment 8. In other words, the polygonal profile ring is defined according to an irregular polygon which is elongated in a direction perpendicular to the second axis X2 along which the compression forces of the stringer frame 2 are transmitted. The optimized surfaces 14i and 144 thus make it possible to better distribute the transmission forces than in the state of the art.Advantageously, the elongated profile of the ring with polygonal profile 14 in the direction perpendicular to the second axis X2 also offers a radial thickness, measured between the bore 15 and the surfaces 142, 143 and 145> which makes it possible to provide the grooves 30 on the surface 15A of the bore 15, without weakening the ring with polygonal profile.

[0122] To ensure optimal operation of the attachment device, the surfaces 15A of the bore 15 inside the surfaces 14i and 144 of the outer peripheral surface of the polygonal profile ring 14 are in direct contact with the outer peripheral surface 16B of the inner ring 16. In other words, the grooves 30 of the bore 15A of the polygonal profile ring 14 and the slots 16C, 16D of the inner ring 16 are not positioned where the forces of the stringer frame 2 are greatest.

[0123] To ensure lubrication of the contacts in the areas where the forces are maximum, a maintenance lubrication process is implemented.

[0124] The hook 10 is unlocked by the operator who exerts a force represented by the arrow F3 on the locking member 42. The hook 10 is then disengaged from the polygonal profile ring 14. The polygonal profile ring 14 is free to rotate around the inner ring 16 and can be placed in a position other than an indexing position.

[0125] The ring with polygonal profile 14 is initially held in a indexing position. The lubrication channel 241 is supplied by means of an external lubrication device and makes it possible to feed with lubricant the grooves 30 of the polygonal profile ring 14, the slots 16C, 16D of the inner ring 16 and the groove 18B of the central rivet 18.

[0126] The polygonal profile ring 14 is then rotated around the inner ring 16 by an operator as illustrated in insert B) of [Fig.2]. The angular amplitude of the rotational displacement around the first axis XI of the polygonal profile ring 14 is less than 180°. Preferably the angular amplitude of the rotational displacement around the first axis XI of the polygonal profile ring 14 is less than 90°, preferably less than 70°.

[0127] When the ring with a polygonal profile 14 is moved in rotation about the first axis XI, the grooves 30 of the bore of the ring 14 move opposite the external peripheral surface 16B of the inner ring 16. In particular, the grooves 30, full of lubricant, deposit lubricant on the areas of the external peripheral surface 16B not including the slots 16C, 16D. The guide walls 46 are flat and are kept in contact with the flanks 14A of the ring with a polygonal profile 14 and in contact with the annular flanks 16E of the inner ring 16. Thus, the lubricant is contained in the grooves 30 regardless of the angular position of the ring with a polygonal profile 14. The rotational movement of the ring with a polygonal profile 14 makes it possible to supply the entire external peripheral surface 16B of the inner ring 16 with lubricant.Advantageously, the rotational movement of the polygonal profile ring 14 is carried out between the guide surfaces 48, 48' without the indexing relief 26 interfering with the flanges 12, 12', the lower edges 12C, 12'C of the flanges 12, 12' being advantageously in the plane of the guide walls 46.

[0128] Thus, the lubrication circuit of the attachment 8 makes it possible to lubricate the entire surface of the bore 16A of the inner ring 16 and the entire external peripheral surface of the inner ring 16. All of the contact surfaces of the attachment 8 intended to transmit the forces of the stringer frame 2 are lubricated.

[0129] A tool for measuring wear of the fastener 8 is illustrated in [Fig.6], in two configurations of use with the fastener 8. The wear measuring tool comprises a hook 68, a lock 69, an operating member 70 and a rocker 72. The measuring tool cooperates with the fastener 8 and in particular with the polygonal profile ring 14, so as to measure the wear of the fastener 8.

[0130] The hook 68 has the same geometry as the hook 10 and comes into an engaged position around the ring with a polygonal profile 14. The lock 69 is similar to the lock 38 and makes it possible to maintain the ring with a polygonal profile 14 in an engaged position with the hook 68. The operating member 70 is similar to the operating member 42 and makes it possible to position the lock 69 in contact with the ring with a polygonal profile 14.

[0131] The rocker 72 is a rounded sheet comprising a hinge pin 74. The hinge pin 74 is housed in a hole, not shown, in the rod 68A of the hook 68. The rocker 72 is free to rotate, relative to the hook 68, around a central axis of the hinge pin 74.

[0132] The rocker 72 comprises two rounded peripheral surfaces 72A and 72B. The first peripheral surface 72A is defined by a radius of curvature RI and the second peripheral surface 72B is defined by a radius of curvature R2. The radii of curvature RI and R2 originate from the central axis of the pin 74. The radius of curvature R2 is strictly less than the radius of curvature RL.

[0133] The wear measuring tool makes it possible to determine whether the wear of the fastener 8, and in particular the wear of the polygonal profile ring 14, is acceptable or not acceptable. To do this, the hook 68 is engaged on the polygonal profile ring 14 using the operating member 70. The hook 68 is then locked, as described for the attachment device 4, using the lock 69.

[0134] The operator can then pivot the rocker 72 using an arm 72C so as to bring one of the external peripheral surfaces 72A, 72B into contact with the lower edge 12'C of the flange 12' of the attachment 8.

[0135] In a first configuration of use illustrated on the insert A) of [Fig.6], the fastener 8 is in a normal operating state then the operator can bring the peripheral surface 72A into contact with the lower edge 12'C of the flange 12' but cannot bring the peripheral surface 72B into contact with the lower edge 12'C.

[0136] In a second configuration illustrated on the insert B) of [Fig.6], the fastener 8 is in an abnormal operating state, the operator can bring the peripheral surface 72B into contact with the lower edge 12'C but cannot bring the peripheral surface 72A into contact with the lower edge 12'C.

[0137] If the tool formed by the rocker makes it possible to detect that the attachment 8 is in an abnormal operating state, the attachment 8 is removed from the stringer frame 2 and is sent for maintenance or replaced.

[0138] The hooking device 4' differs from the hooking device 4 in that the attachment 60 of the hooking device 4' is of a different shape.

[0139] In particular, the flanges 62 of the attachment 60 are rectangular in shape and are mounted by means of three rivets 64 on the horizontal bar 2B mounted on the crosspiece 2C of the heald frame 2. The mounting walls of the flanges 62 bear on the heald frame 2. The guide walls configured to guide the sides of the polygonal profile ring 14 are in continuity with the respective mounting walls.

[0140] Apart from these differences, the hooking device 4' is similar to the hooking device 4.

[0141] According to variants not shown, the ring with polygonal profile 14 comprises other arrangements of grooves 30. In particular the number of grooves 30, their depths, their shapes, their distribution on the bore 15, for example, may be different and must be sized according to the targeted weaving application.

[0142] According to other variants not shown, the inner ring 16 comprises slots of different geometries and arrangements. For example, the shape, extent and number of slots may be different to the extent that the lubrication of all the contact surfaces of the attachment 8 intended to transmit the forces of the stringer frame 2 is ensured.

[0143] The shedding machine comprises, indifferently and in a manner compatible with the present invention, a cam machine, a rotary dobby, or a frame actuator.

[0144] According to other variants not shown, the guide bearing surfaces 48, 48' are of different geometry and arrangement. For example, the boss is of different shape, the guide bearing surfaces are not produced on the lateral free edges of the flanges, several guide bearing surfaces of the same flange comprise a boss.

[0145] As far as technically feasible, the above-mentioned variants can be combined with each other.

Claims

Claims

1. A hooking device (4, 4') between a heddle frame (2) and a lever actuated by a shed forming machine of a weaving loom, the hooking device (4, 4') comprising - a fastener (8, 60) configured to be secured to a stringer frame (2), and comprising • two flanges (12, 12', 62) respectively comprising internal walls (12A), facing one another, and external walls (12B), opposite one another, • an inner ring (16) • mounted between the internal walls (12A) of the two flanges (12, 12', 62), around a first axis (XI) of the attachment device (4) perpendicular to the two flanges (12, 12', 62) and • provided with a first slot (16C) and a second slot (16D) provided on its external peripheral surface (16B); • a ring with a polygonal profile (14) mounted in rotation around the inner ring (16) in an angular indexing position and comprising • a bore (15) intended to receive the inner ring (16), • a greaser (24) comprising a lubrication channel (241), radial to the first axis, opening through an orifice (241A) onto the bore (15) of the ring with polygonal profile (14) and • two mounted flanks (14A) between the internal walls (12A) of the flanges (12, 12', 62) and parallel to the internal walls (12A) of the flanges (12, 12', 62); a hook (10), configured to cooperate with the polygonal profile ring (14) and comprising • a hook opening (34), • two flanks (10A, 10B) between which is defined a hook thickness measured parallel to the first axis (XI) when the hook (10) is in an engaged position on the ring with polygonal profile (14), • a locking member (38) capable of holding the hook (10) in cooperation with the ring with polygonal profile (14) when the hook (10) is in the engaged position, characterized in that the ring with polygonal profile (14) comprises grooves (30) for receiving a lubricant, formed on the surface (15A) of its bore (15).

2. Attachment device according to claim 1, characterized in that the grooves (30) of the ring with polygonal profile (14) extend along the first axis (XI) of the attachment device (4) and over the entire thickness of the ring with polygonal profile (14), between its two sides (14A).

3. Attachment device according to one of claims 1 and 2, characterized in that at least a part (30A, 30B) of the grooves (30) of the ring with polygonal profile (14) is distributed, orthoradially around the first axis (XI) of the device, on either side of the orifice (241A) of the lubrication channel of the lubricator (24) of the ring with polygonal profile (14).

4. Attachment device according to one of claims 1 to 3, characterized in that the ring with a polygonal profile (14) comprises on its bore (15): - a first set (30A) of grooves (30) distributed over a first angular sector, - a second set (30B) of grooves (30) distributed over a second angular sector in that, in an angular indexing position of the ring with a polygonal profile (14), the first angular sector is opposite the first slot (16C, 16D) of the inner ring (16) and the second angular sector is opposite the second slot (16C, 16D) of the inner ring (16).

5. Hanging device according to claim 4 characterized in that the first angular sector and the second angular sector each comprise: - at least one first groove (301) having a first depth (pl), - at least two second grooves (302) having a second depth (p2) smaller than the first depth and arranged on either side of each first groove (301), - surface portions (15A) of the bore (15) of the ring with polygonal profile (14) in contact with the peripheral external surface (16B) of the inner ring (16) arranged, in a direction orthoradial to the first axis (XI), each between two grooves (301, 302).

6. Hanging device according to one of claims 4 and 5, characterized in that: - the first slot (16C) and the second slot (16D) provided on the outer peripheral surface (16B) of the inner ring (16) are diametrically opposed, - the inner ring (16) comprises a first through channel (161) of which a first orifice (161A) opens into the center of the first slot (16C) and a second through channel (162) of which a first orifice (162A) opens into the center of the second slot (16D), the center of a slot (16C, 16D) being defined as the middle of the orthoradial extent around the first axis (XI) of said slot (16C, 16D), - in an angular indexing position of the ring with polygonal profile (14), the first (30A) and the second set (30B) of grooves of the ring with polygonal profile (14) are distributed, orthoradially to the first axis (XI), symmetrically with respect to the first orifice (161 A, 162A) of each through channel (161, 162) of the inner ring (16).

7. A hanging device according to one of claims 4 to 6, characterized in that the first set (30A) of grooves and the second set (30B) of grooves are each extended orthoradially. around the first axis (XI) of the device on an angular sector with an apex angle (a) greater than or equal to 40°, preferably greater than or equal to 60°, more preferably greater than or equal to 100°.

8. Attachment device according to one of the preceding claims, characterized in that each flange (12, 12', 62) of the fastener (8, 60) comprises: - a mounting wall (44) configured to bear on the stringer frame (2), - a guide wall (46) configured to guide the flanks (14A) of the polygonal profile ring (14), perpendicular to the first axis (XI), extending between the mounting wall (44) and a lower edge (12C, 12'C) of the flange (12, 12') and defining a guide plane for the polygonal profile ring (14), - projecting bearing surfaces (48, 48') of the guide wall (46), on the side of the internal walls (12A), defining a space intended to receive the hook (10) and configured to laterally guide the flanks (10A, 10B) of the hook (10) in the engaged position of the hook (10), and in that a guide spacing of the ring (14) between the two guide walls (46) of the two flanges (12, 12'),measured along the first axis (XI), is strictly greater than a distance between the projecting surfaces (48, 48') of the two flanges (12, 12'), measured along the first axis (XI).,

9. Attachment device according to claim 8, characterized in that the guide wall (46) of each flange (12, 12', 62) extends over a surface area greater than the area of the surface delimited by a circumscribed circle (C, C') of the projection of the polygon of the polygonal profile of the ring with polygonal profile (14) on the flange (12, 12', 62) and comprising the surface delimited by said circumscribed circle (C, C').

10. Attachment device according to claim 9, characterized in that at least two of the bearing surfaces (48, 48') of each of the flanges (12, 12', 62) are arranged outside the circumscribed circle (C, C') of the projection of the polygon of the polygonal profile of the ring with polygonal profile (14) on the guide wall (46).

11. Hanging device according to claim 10, characterized in that each guide wall (46) comprises at least one first receiving groove (52, 54) formed between two of the guide surfaces (482, 483, 484, 485, 48'2, 48'3, 48'4, 48'5), the first receiving groove (52, 54) being configured to receive an indexing relief (26) of the polygonal profile ring (14) and to limit the rotation of the polygonal profile ring (14) around an indexing position.

12. Attachment device according to one of claims 8 to 11, characterized in that at least one of the bearing surfaces (48b 48'i) of each of the flanges comprises a boss located between the first axis (XI) and the mounting wall (44) of the flange (12, 12', 62).

13. A hooking device according to claims 11 and 12, characterized in that: - the boss is oblong, - the largest dimension of the boss extends perpendicular to a reference plane (PI) containing the first axis (XI) and a second axis (X2) perpendicular to the first axis (XI) which passes through the lower edge (12C, 12'C) of the flange (12, 12', 62), - the boss is symmetrical with respect to the reference plane (PD, - each guide wall (46) comprises a second receiving groove (52, 54) formed between two of the guide surfaces (482, 483, 484, 485, 48'2, 48'3, 48'4, 48'5) and symmetrical to the first receiving groove (52, 54) with respect to the reference plane (PI), the second receiving groove (52, 54) being configured to receive an indexing relief (26) of the polygonal profile ring (14) and to limit rotation of the polygonal profile ring (14) around an indexing position.

14. Hooking device according to one of claims 8 to 13, characterized in that: - the bearing surfaces (48) of the guide wall (46) of the first flange (12, 62) define a first guide plane for the hook (10) parallel to the guide wall of the first flange (12, 62), - the bearing surfaces (48') of the guide wall of the second flange (12', 62) define a second guide plane for the hook (10) parallel to the guide wall of the second flange (12', 62), - a distance between the first guide plane of the hook (10) and the second guide plane of the hook (10) is equal to the thickness of the hook (10).

15. Hanging device according to one of claims 8 to 14, characterized in that a distance, measured along the first axis (XI), between the mounting walls (44) of the two flanges (12, 12') is less than the guide spacing of the polygonal profile ring (14).

16. Hanging device according to one of the preceding claims, characterized in that the ring with polygonal profile (14) has a constant thickness, measured along the first axis (XI) as the distance between the two flanks (14A) of the ring with polygonal profile (14), and in that the constant thickness of the ring with polygonal profile (14) is greater than the thickness of the hook (10).

17. A method of lubricating a hooking device according to one of the preceding claims, characterized in that the method comprises at least the following steps: a. unlocking the hook (10) from the polygonal profile ring (14) by means of the locking member (38), b. disengaging the hook (10) from the polygonal profile ring (14), c. supplying the grooves (30) of the polygonal profile ring (14) with lubricant via the lubrication channel (241) by means of an external lubrication device, d. driving the polygonal profile ring (14) in rotation around the inner ring (16), the rotation relative to the indexing position of the polygonal profile ring (14) having an angular amplitude of less than 180°, preferably less than 90°, preferably less than 70°.

Images