EP1002931B1 - Lateral guiding carriage for sectional doors with vertical opening - Google Patents

Abstract

The door lateral guide carriage body has a cylindrical sleeve (9), and a cylindrical drum (27) able to slide and rotate inside the sleeve. Inside the drum is an eccentric bearing (28) housing a shaft (36) carrying a roller (4) running in a lateral guide rail (5). The carriage has a lock allowing rotation of the drum into a position in which the drum is fixed inside the sleeve and rotationally locked after its translation inside the sleeve.

Description

The invention relates to a lateral guide carriage for doors. vertical deletion sectionals.

The vertical sectional doors are, so current, consisting of a plurality of panels hinged together by through hinges, and further comprise side carriages of guide bearing guide rollers adapted to roll in guide rails arranged longitudinally on either side of said sectional door.

In addition, and conventionally, the aforementioned guide rails do not extend vertically but are inclined at an angle of the order of a few degrees (seven degrees in theory) from the vertical so as to avoid the friction of the sectional door against the seals during maneuvers of the latter, and to ensure better sealing in position closed of said sectional door.

For this reason, the lateral guide carriages are designed so as to allow adjustment of the position of the guide rollers ensuring a progressive shift of the latter, depending on the inclination of the guide rails.

• un corps de chariot doté d'une face d'appui contre un panneau de porte sectionnelle, et destiné à être fixé latéralement sur ledit panneau,
• un palier agencé pour s'étendre parallèlement aux axes d'articulation des panneaux, porté par le corps de chariot par l'intermédiaire de moyens de réglage de la distance entre l'axe dudit palier et la face d'appui du corps de chariot,
• et un arbre inséré partiellement dans le palier et portant un galet agencé pour rouler dans un rail latéral fixe de guidage,

To this end, these lateral guide carriages conventionally include:

• a carriage body provided with a bearing face against a sectional door panel, and intended to be fixed laterally on said panel,
• a bearing arranged to extend parallel to the axes of articulation of the panels, carried by the carriage body by means of means for adjusting the distance between the axis of said bearing and the bearing face of the carriage body,
• and a shaft partially inserted in the bearing and carrying a roller arranged to roll in a fixed lateral guide rail,

At present, in order to ensure the adjustment of the position of the rollers, the guide carriages typically have a wall portion arranged to extend horizontally and pierced with an extending light orthogonally to the bearing axis. The latter is carried by a plate able to be moved on the horizontal wall of the carriage guide and provided, at the base of the light thereof, an orifice allowing secure said plate to the carriage by means of a screw / nut assembly once the positioning of the adjusted roller.

The disadvantage of such adjustment means is that they first need to adjust the position of the roller, then once the appropriate adjustment obtained, to ensure the blocking in translation of the plate carrying the bearing by means of an appropriate tool, without modifying the position in any way previously defined setting. Indeed, and first of all, such an operation of adjustment requires the use of an appropriate tool. In addition, it turns out that during the blocking operation, the plate often undergoes a displacement leading to a final positioning of the roller different from that previously desired, which is requires to renew the entire operation of adjusting the position of said roller, or results in imperfect guiding of the sectional door.

There are also currently sectional doors whose hinges and lateral guide carriages are replaced by profiles articulated on the panels and designed to form a hinge keep on going. Such profiles are described in particular in patent EP 0.545.109 and include, for the purpose of adjusting the position of the guide rollers, a barrel pierced longitudinally with an eccentric bore inside which extends the shaft carrying said guide roller, and provided with a plurality of grooves arranged to engage in two corresponding ribs of the profile. According to this principle, the eccentricity of the axis of the bore housing the roller-bearing shaft with respect to the axis of the barrel allows by simple rotation of said barrel about its axis, before engagement of the latter in the ribs of the profile, to modify and adjust the position of the roller. However, this adjustment is obtained by successive adjustments of the angular position of the barrel necessitating each time removal and refitting place of said barrel, and proves in practice not easy to achieve except to accept a fairly large tolerance for the position of the roller.

The present invention aims to overcome the aforementioned drawbacks means for adjusting the position of the guide rollers of the sectional doors, and has as main objective to provide a lateral guide carriage for door sectional allowing very easy adjustment of the position of the guide roller carried by said guide carriage without requiring any tool.

• un manchon cylindrique solidaire du corps de chariot et d'axe de révolution parallèle à l'axe du palier,
• un tambour cylindrique de dimensions adaptées pour pouvoir coulisser et tourner à l'intérieur du manchon cylindrique, à l'intérieur duquel est solidarisé de façon excentrée le palier,
• lesdits manchon cylindrique et tambour comportant :
  • des moyens de blocage en rotation aptes, d'une part à autoriser une rotation du tambour dans au moins une position, dite de réglage, dans laquelle ledit tambour est emmanché d'une longueur prédéterminée à l'intérieur dudit manchon et, d'autre part à bloquer en rotation le tambour dans au moins une position, dite de blocage en rotation, obtenue après translation du tambour à l'intérieur du manchon à partir d'une position de réglage,
  • des moyens de blocage en translation du tambour à l'intérieur du manchon, dans chaque position de blocage en rotation dudit tambour.

To this end, the invention relates to a lateral guide carriage as described in the preamble above, the means for adjusting the position of the bearing relative to the carriage body include:

• a cylindrical sleeve secured to the carriage body and to an axis of revolution parallel to the axis of the bearing,
• a cylindrical drum of dimensions adapted to be able to slide and rotate inside the cylindrical sleeve, inside of which the bearing is secured eccentrically,
• said cylindrical sleeve and drum comprising:
  • means for locking in rotation suitable, on the one hand for authorizing rotation of the drum in at least one position, known as an adjustment position, in which said drum is fitted with a predetermined length inside said sleeve and, on the other hand part to block in rotation the drum in at least one position, called rotation blocking, obtained after translation of the drum inside the sleeve from an adjustment position,
  • means for blocking the drum in translation inside the sleeve, in each position for blocking the rotation of said drum.

It should be noted that the term "level" intends to define so general any means known per se adapted to support and guide the shaft in rotation bearing the guide roller.

According to the invention, the adjustment of the position of the roller guidance is obtained very simply by rotating the drum inside the cylindrical sleeve then, once the adjustment has been made, by moving axially said drum so as to bring it into a rotational locking position.

During the rotation of the drum, in fact, the bearing housed eccentrically inside said drum, is caused to rotate around the axis of this last, so that the distance between the axis of said bearing and the bearing face on the cart body panels varies continuously.

The adjustment operation can thus be carried out with a single hand without requiring any tool, and lead to an accuracy of positioning only as a function of the precision of the locking means in drum rotation.

According to another characteristic of the invention, the means of locking in rotation include notches and complementary axial notches formed respectively on the opposite faces of the peripheral walls of the sleeve and drum, from one end of these, so that a notch can enter a notch for rotational locking positions of said drum and sleeve, by driving in the drum inside the sleeve from an adjustment position where said drum is partially extracted from said sleeve.

According to this characteristic, the precision of the adjustment obtained is function of the angular distribution of the notches and / or notches formed on the drum and sleeve and can therefore be optimized very easily.

To this end, the notches are advantageously provided on the inner face of the peripheral wall of the sleeve and juxtaposed with each other others around the entire periphery of said peripheral wall, the drum comprising at least one notch formed on the external face of its peripheral wall.

In addition, the drum preferably comprises four notches uniformly distributed around the axis of said drum, in order to guarantee the perfect rotation blocking of this drum.

The sleeve advantageously comprises two series of notches formed respectively at each end of said sleeve. Therefore, the guide carriage can be fixed on either either side of the sectional door, simply by reversing the direction inserting the drum into the sleeve, so that only one model of carriage guide is required to equip the entire sectional door.

According to another characteristic of the invention, the means of translation locking of the drum inside the sleeve includes a rim external device formed at the end of the drum provided with notches, able to come into abutment against the sleeve when said drum is pressed in inside said sleeve, and at least one retractable elastic axial tongue radially, provided with an external stop notch against the opposite end of the muff.

Furthermore, the bearing is preferably attached to the wall drum device so as to obtain a maximum range of adjustment of the position of the guide roller.

• une première pièce d'un seul tenant avec le corps de chariot, présentant la forme d'un berceau de section conjuguée de celle du tambour,
• et une seconde pièce constituée d'une coquille de forme complémentaire de celle du berceau apte à former avec ce dernier le manchon cylindrique.

According to an advantageous embodiment, the cylindrical sleeve is made up of two parts provided with assembly means adapted to enable them to be joined and separated:

• a first piece in one piece with the carriage body, having the shape of a cradle with a cross-section of that of the drum,
• and a second part consisting of a shell of shape complementary to that of the cradle capable of forming with the latter the cylindrical sleeve.

Such a design indeed makes it possible to secure the body of the trolley on the panels, on a factory assembly line, and to introduce easy way on site the guide roller in its guide rail, after removal of the shell of the cylindrical sleeve, without having to separate the cradle from the sign.

According to another characteristic of the invention, the body of carriage has two portions of concave front walls extending respectively on either side of the sleeve in the continuity of the wall peripheral of the latter, said front wall portions being pierced holes for fixing said carriage body to a door panel Sectional.

Furthermore, the carriage body preferably constitutes a first element of a hinge provided with a transverse central pivot and a second hinge element having the general shape of a plate capable of being fixed on a sectional door panel.

According to another characteristic of the invention, the shaft carries roller is a hollow shaft of length greater than that of the bearing, and has a abutment end flange against said bearing, and opposite said flange, an end section with an external diameter less than the current external diameter of said shaft, defining a raceway for the roller, said section end being provided with at least two axial slots delimiting a tongue flexible with an external notch of axial stop of said roller.

In addition, this roller bearing shaft advantageously comprises a pin adapted to be inserted axially and locked in the end section of said shaft, said pin being provided with a collar comprising, for each notch external of said roller bearing shaft, a notch capable of accommodating said notch so as to form with the latter a radial crown of axial stop of the roller.

• la figure 1 est une vue en perspective d'un chariot de guidage conforme à l'invention,
• la figure la est une vue en perspective du pion associé à l'arbre porte galet de guidage dudit chariot de guidage,
• la figure 2 est une coupe longitudinale par un plan A de ce chariot de guidage monté sur deux panneaux contigus d'une porte sectionnelle,
• la figure 3 en est une coupe longitudinale par un plan B de ce chariot de guidage,
• la figure 4 est une coupe transversale par un plan C de ce chariot de guidage monté sur une porte sectionnelle,
• la figure 5 est une coupe transversale par un plan D de ce chariot de guidage,
• la figure 6 est une coupe axiale par un plan E du tambour de ce chariot de guidage,
• la figure 7 est une coupe axiale par un plan F de ce tambour,
• et les figures 8a et 8b sont deux vues latérales schématiques de ce chariot de guidage monté sur une porte sectionnelle.

Other characteristics, objects and advantages of the invention will emerge from the detailed description which follows, with reference to the appended drawings which represent, by way of non-limiting example, a preferred embodiment. In these drawings:

• FIG. 1 is a perspective view of a guide carriage according to the invention,
• FIG. 1a is a perspective view of the pin associated with the guide roller guide shaft of said guide carriage,
• FIG. 2 is a longitudinal section through a plane A of this guide carriage mounted on two contiguous panels of a sectional door,
• FIG. 3 is a longitudinal section thereof through a plane B of this guide carriage,
• FIG. 4 is a cross section through a plane C of this guide carriage mounted on a sectional door,
• FIG. 5 is a cross section through a plane D of this guide carriage,
• FIG. 6 is an axial section through a plane E of the drum of this guide carriage,
• FIG. 7 is an axial section through a plane F of this drum,
• and Figures 8a and 8b are two schematic side views of this guide carriage mounted on a sectional door.

The guide carriage according to the invention shown in Figures 1 to 5 is suitable to be fixed laterally on adjoining panels 1, 2 a sectional door, and designed, on the one hand, to act as a hinge relative articulation of said panels, and, on the other hand, to guide the sectional door during its operations, being conventionally provided with a roller guide 4 arranged to roll in a lateral guide rail 5 extending longitudinally on the side of said sectional door.

This guide carriage is, first of all, made up of two separate elements 6, 7 articulated around a central pivot 8 and adapted to be each joined together on a panel 1, 2.

The first of these elements 6 comprises a sleeve transverse cylindrical 9 extended by two concave wall portions, lower 10 and higher 11, extending in the continuity of the peripheral wall of said sleeve and forming therewith the "carriage body" adapted to be fixed on a panel 1 of the sectional door. This carriage body is also closed laterally by side walls such as 12 conforming to the concave profile of the lower 10 and upper 11 wall portions and defining a flat face of support on the sectional door panel 1.

In addition, for the purpose of fixing this carriage body to a panel, each of the lower 10 and upper 11 wall portions is pierced with two orifices such as 13, capable of accommodating the head of the fixing screw such as 15.

The upper wall portion 11 has a bead-shaped upper end consisting of two sleeves 16, 17 coaxial separated by a slot, and forming the connecting socket structure first element 6 and second element 7 of the guide carriage.

The cylindrical sleeve 9, for its part, comprises two series internal axial notches such as 18, 19 formed respectively from each end face of said cylindrical sleeve, each series of notches 18, 19 consisting of a plurality of juxtaposed notches distributed over the whole the periphery of this cylindrical sleeve 9.

• une première pièce 9a d'un seul tenant avec les portions de paroi inférieure 10 et supérieure 11, définissant entre lesdites portions de parois, et dans la continuité de ces dernières, un berceau de forme générale semi-cylindrique,
• une seconde pièce 9b de forme générale semi-cylindrique formant une coquille adaptée pour venir s'assembler sur le berceau 9a, de façon à former avec ce dernier le manchon cylindrique 9.

This cylindrical sleeve is also made up of two complementary parts 9a, 9b provided with assembly means making it possible to separate them:

• a first part 9a in one piece with the lower wall 10 and upper wall portions 11, defining between said wall portions, and in the continuity of the latter, a cradle of generally semi-cylindrical shape,
• a second part 9b of generally semi-cylindrical shape forming a shell suitable for coming to assemble on the cradle 9a, so as to form with the latter the cylindrical sleeve 9.

This second part 9b further comprises two tabs symmetrical deformables such as 50 each extending in the extension of the base of said second part, and each endowed, at their free end, an external hook 51 for ratcheting.

Each of these tabs 50 is, moreover, arranged at the interior of a light 52 formed in the peripheral wall of the second part 9b, and adapted to allow manual deformation of said tabs in view of the connection and separation of the two parts 9a, 9b forming the cylindrical sleeve 9.

The cradle 9a comprises, in turn, in the extension of each of the lower 10 and upper 11 portions, a return such as 53, extending tangentially with respect to the end section of said cradle, and adapted to form a locking stop for each hook 51.

The second element 7 of this guide carriage forms to him a support plate on a sectional door panel 2, extended by bead consisting of two coaxial sleeves 20, 21 separated by a slot forming the nesting structure complementary to that of the first element 6, adapted to accommodate with the latter the pivot 8 of articulation of said elements.

As shown in Figure 5, this pivot 8 consists of a rod 22 with a head 23 and pierced at its end opposite to said head, with a blind axial bore 24 opposite which said rod has two tabs elastic bands such as 25 diametrically opposed, each delimited by two axial slots, and each provided with an external notch such as 26 for locking in translation of the rod 22 inside the sleeves 16, 17, 20, 21.

The guide carriage according to the invention also comprises a cylindrical drum 27 of dimensions adapted to be inserted and able turn inside the cylindrical sleeve 9.

This drum 27 first accommodates a cylindrical tube 28 able to accommodate the shaft carrying the guide roller 4, said tube being attached to the wall device of said drum and made in one piece with the latter, so as to be eccentric relative to the axis of the drum 27. This drum 27 and, moreover, closed at one of its ends by a circular wall 29 of greater diameter to the external diameter of said drum, so as to delimit on the periphery of the latter an outer peripheral rim of abutment against one of the end faces of the cylindrical sleeve 9. In addition, this circular wall 29 is pierced with an orifice in the extension of the bearing tube 28.

The drum 27 further comprises four external notches axial such as 30, 31 attached to the peripheral edge of the circular wall 29 and sections adapted to penetrate each into a notch 18, 19 of the sleeve cylindrical 9, in a position for fully inserting the drum inside said cylindrical sleeve where the circular wall 29 abuts against this cylindrical sleeve 9.

The drum 27 comprises, finally, opposite the wall circular 29, two deformable bands 32, 33 diametrically opposite, delimited each by two axial slots formed in the peripheral wall of said drum. In addition, these deformable bands 32, 33 extend partially in the extension of the drum 29 and are each provided, at this extension, an external notch 34, 35 for locking in translation of said drum relative to the cylindrical sleeve 9.

As shown in Figure 4, the guide carriage also includes a hollow shaft 36 on which the guide roller 4 is mounted, adapted to be inserted into the cylindrical tube 28.

This hollow shaft 36 of length greater than that of the tube 28 has, over its greatest length, an external diameter combined with the diameter internal of said tube, and has an end section 37 of smaller diameter forming the raceway of the guide roller 4.

This hollow shaft 36 further comprises, at the level of the section end 37, two diametrically opposite deformable bands delimited each by two axial slots and each provided with an external stop 38, 39 axial of the guide roller 4.

This hollow shaft 36 also comprises, opposite the end section 37, a flange 40 of abutment against the circular wall 29 of the drum 27.

This hollow shaft 36 comprises, finally, upstream of the section end 37, in the direction of the flange 40, an internal excess thickness delimiting a partial conduit 41 of internal diameter less than the current internal diameter of said hollow tree.

The guide carriage finally comprises a pin 42 shown in Figure la, arranged to be inserted into the end section 37 of the hollow shaft 36 and adapted to ensure in particular the non-deformability of said end section a times the guide roller 4 placed around it.

This pin 42 has firstly two legs longitudinal flexible 43, 44 each having an external notch 45, 46, extending in the axial extension of a nozzle 47 of section adapted to be housed in the end section 37 of the hollow shaft 36. These longitudinal tabs 43, 44 are, in further, arranged to snap to the rear of the conduit 41 via notches 45, 46.

The pin 42 comprises, finally, a flange 48 formed at the level of the end of the end piece 47, and provided with notches 49 capable of accommodating each one of the external notches 38, 39 of the shaft those 36, said flange being arranged for extend in the same radial plane as said external notches so as to form with these an axial abutment crown of the guide roller.

Such a guide carriage allows, first of all, by a simple rotation of the drum 27 inside the cylindrical sleeve 9, authorized in initially positioning said drum in the position shown in Figure 1 where the notches 30, 31 are released from the notches 18, 19, to adjust the distance separating the axis of rotation of the guide roller 4 of the internal face of the panel 1 corresponding to the sectional door, so as to bring said guide roller to bear against the running face of the guide rail 5.

Once this adjustment has been made, a simple translation of the drum 27 tending to engage the notches 30, 31 in the notches 18, 19 located in vis-à-vis said notches, allows to freeze the adjustment, any subsequent translation being then prohibited by snapping onto the cylindrical sleeve 9 of the notches 34, 35 of said drum.

Figures 8a and 8b show by way of example the two extreme setting positions "emin" and emax "obtained respectively when the axis of the guide roller 4 and the axis of the drum 27 extend in the same plane horizontal.

In addition, thanks to the two-piece design 9a, 9b of the cylindrical sleeve 9, the body of the carriage 9-11 and the second element 7 can be fixed in the factory on panels 1, 2, the connection between said panels can be carried out on site, in situ, by assembling and locking these two elements by means of the central pivot 8.

Indeed, due to the possibility of separating the two parts 9a, 9b, the guide roller 4 can be easily inserted into the rail guide 5 without having to unscrew the screws 15 of the cylindrical sleeve 9.

For this purpose, the two parts 9a, 9b are separated, the drum 27 is placed in the cradle 9a, and the shell 9b finally assembled on said cradle, so as to ensure the final maintenance of said drum.

Claims (12)

1. A lateral guide trolley for sectional doors with vertical lift which are constituted by a plurality of panels (1, 2) articulated to one another about transverse axes, said lateral guide trolley comprising:

   a trolley body (6) which is endowed with a face for support against a panel (1) of a sectional door and which is intended to be laterally fixed to said panel,

   a bearing (28) which is arranged so as to extend parallel to the axes of articulation of the panels (1, 2) and which is borne by the trolley body (6) through the agency of means for adjusting the distance between the axis of said bearing and the support face of the trolley body,

   and a shaft (36) which is partially inserted into the bearing (28) and which bears a roller (4) which is arranged so as to roll in a fixed lateral guide rail (5),

   said guide trolley being characterised in that the means for adjusting the position of the bearing (28) relative to the trolley body (6) comprise:

   a cylindrical sleeve (9) which is integral with the trolley body (6) and which has an axis of rotation parallel to the axis of the bearing (28),

   a cylindrical drum (27) having dimensions which are adapted so as to be capable of sliding and rotating within the cylindrical sleeve (9), within which the bearing (28) is engaged in eccentric manner,

   said cylindrical sleeve and said drum including:

   means (18, 19, 30, 31) for blocking rotation which are capable, on the one hand, of permitting a rotation of the drum (27) in at least one position, the so-called adjustment position, in which said drum is fixed with a predetermined length within the sleeve (9) and, on the other hand, of blocking rotation of the drum (27) in at least one position, the so-called rotation-blocking position, which is obtained after translation of said drum within the sleeve (9) from an adjustment position,

   means (29, 34, 35) for blocking translation of the drum (27) within the sleeve (9), in each rotation-blocking position of said drum.
2. Lateral guide trolley according to Claim 1, characterised in that the means for blocking rotation comprise notches (18, 19) and complementary axial catches (30, 31) which are provided, respectively, on the opposite faces of the peripheral walls of the sleeve (9) and of the drum (27), starting from one end of these latter, in such a way that a catch (30, 31) is able to penetrate into a notch (18, 19) for predetermined rotation-blocking positions of said drum and said sleeve by sinking of the drum (27) within the sleeve (9), starting from an adjustment position in which said drum is partially extracted from said sleeve.
3. Lateral guide trolley according to Claim 2, characterised in that the notches (18, 19) are provided on the internal face of the peripheral wall of the sleeve (9) and are juxtaposed with one another over the entire circumference of said peripheral wall, the drum (27) comprising at least one catch (30, 31) which is provided on the external face of its peripheral wall.
4. Lateral guide trolley according to Claim 3, characterised in that the drum (27) comprises four catches (30, 31) which are uniformly distributed about the axis of said drum.
5. Lateral guide trolley according to one of Claims 3 or 4, characterised in that the sleeve (9) includes two series of notches (18, 19) which are provided respectively in the region of each of the extremities of said sleeve.
6. Lateral guide trolley according to one of Claims 2 to 5, characterised in that the means for blocking translation of the drum (27) within the sleeve (9) comprise an external peripheral edge (29) which is provided in the region of the extremity of the drum (27) that is endowed with catches (30, 31) and which is capable of coming to abut against the sleeve (9) when said drum is sunk within said sleeve, and at least one radially retractable elastic axial tongue (32, 33) which is endowed with an external catch (34, 35) for abutment against the extremity opposite the sleeve (9).
7. Lateral guide trolley according to one of the preceding claims, characterised in that the bearing (28) is attached to the peripheral wall of the drum (27).
8. Lateral guide trolley according to one of the preceding claims, characterised in that the cylindrical sleeve (9) is constituted by two parts (9a, 9b) endowed with means of assembly (50-53) which are adapted so as to permit them to be engaged and disengaged:

   a first part (9a) in one piece with the trolley body (6), taking the form of a cradle having a cross-section conjugate with that of the drum (27),

   and a second part (9b) constituted by a shell having a shape complementary to that of the cradle (9a), which together with the latter is capable of forming the cylindrical sleeve (9).
9. Lateral guide trolley according to one of the preceding claims, characterised in that the trolley body (6) includes two portions of concave frontal walls (10, 11) extending respectively on either side of the sleeve (9) in the continuity of the peripheral wall of the latter, said frontal-wall portions being pierced by orifices (13) for the fastening of said trolley body to a panel (1) of a sectional door.
10. Lateral guide trolley according to one of the preceding claims, characterised in that the trolley body (6) constitutes a first element of a hinge which is endowed with a transverse central pivot (8) and with a second hinge element (7) having the general shape of a plate which is capable of being fixed to a panel (2) of a sectional door.
11. Lateral guide trolley according to one of the preceding claims, characterised in that the shaft (36) bearing the roller (4) is a hollow shaft of length greater than that of the bearing (28) and includes an end flange (40) for abutment against said bearing and, on the opposite side of said flange, an end section (37) of external diameter smaller than the regular external diameter of said shaft, defining a raceway for the roller (4), said end section being endowed with at least two axial slots delimiting a flexible tongue which is endowed with an external catch (38, 39) for axial abutment of said roller.
12. Lateral guide trolley according to Claim 11, characterised in that the shaft (36) bearing the roller (4) comprises a pin (42) which is adapted so as to be axially inserted and to be locked in the end section (37) of said shaft, said pin being endowed with a flange (48) including, for each external catch (38, 39) of said roller-bearing shaft, a notch (49) which is capable of accommodating said catch in such a way as to form with the latter a radial ring for axial abutment of the roller (4).

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