Abstract: A traction-type clutch bearing device includes an engaging piece (1) maintained in permanent contact with the clutch diaphragm (13) by an elastic member (14), a thrust bearing (2) which can move axially relative to a guide tube (10) under the action of a control member (11), and an axial connecting device interacting with a retaining groove made either in the engaging piece or in a member of the thrust bearing to connect and/or disconnect the thrust bearing and the engaging piece. The connecting device includes a ball cage (3) and a plurality of balls (23) mounted between the engaging piece (1) and the thrust bearing (2) and which are capable, in the connection position, of interacting with a wedging zone (25) and the a retaining groove (24), to ensure axial locking, and, during removal, with a release zone (30). The wedging zone (25) and the release zone (30) are located either on an inner raceway (6) of the thrust bearing (2) or on the engaging piece (1).

Abstract: Free wheel, the cage (5) of which consists of two identical half cages (6, 7) each incorporating an intermediate cylindrical envelope (8) which is firmly fixed to portions forming surfaces (9, 10), which may or may not be continuous, for bearing against the surfaces of the shaft (1) and the bore (2), or the same side as, or on the side remote from the row of cams (3), the said intermediate envelope (8) incorporating notches (12 to 18) of such a shape that it allows the two half cages when positioned facing one another to be fitted together by an axial movement, enclosing the said spring between the central envelope (8) and the surface (9) for bearing upon the shaft, and leaving rectangular openings (15-17, 16, 15-17, 16) for cams (3) to be radially introduced, which thus lock axially the two half cages.

Abstract: The registering front faces of the two portions (8, 9) of the outer race comprise each at least two precision-machined axial projections forming together a radial reference surface. In each portion the projections are separated by axial recesses each adapted to be engaged by a corresponding axial projection of the other portion so that after a relative rotation of the two portions of the outer race the rolling elements (19) of the second row can easily be fitted in position, the bearing being completed by encompassing the joint plane formed between the two portions with an annular seal, for example in the form of a rubber flat ring. Thus, the permissible bearing load is increased since the two rows (18, 19) of rolling elements have the same number of such rolling elements.

Abstract: A swivel joint comprises an outer ring having a cavity in the form of a portion of sphere, and an inner ring whose shape is partly spherical and which is housed in the spherical cavity of the outer ring. The inner ring presents only two diametrically opposite notches, disposed substantially in the median plane perpendicular to the axis of the ring. The outer ring presents only two pairs of notches whose width is equal, to within the clearance, to the width of the parts of the ring which flank the notches of the inner ring, the two notches of the same pair of outer ring notches being spaced apart from each other by a distance equal, to within the clearance, to the width of the notches of the inner ring, the assembly of two notches of a pair of outer ring notches extending over a width substantially equal to the thickness of the inner ring.

Abstract: Clutch thrust bearing unit with guided elastic self-alignment.Elastic means 17 are inserted between a cylindrical part 18 of the guide sleeve and the inner ring (1) of the rolling bearing. The inner ring 1 has a radial arm 5 in rubbing contact with a radial annular guide section 20 fixed to the part 18. The annular portion 20 comprises a flange 24 fitted with rounded ends 25 which act as locking means on rotation of the inner ring 1 during which at least one extension 23 butts against one end 25 of the flange 24.Any relative rotation between the inner ring 1 and the guide sleeve 20 is thus prevented, which limits the relative wear of these parts in rubbing contact.

Abstract: A freewheel of the cam type has a series of jamming cams 1 held by a cage 4 between a shaft 3 and an outer sleeve 2. The cams 1 are held in recesses 5 in the cage, which is a single integral moulding, by an integral spring strip 9 which extends around the outer periphery of the cage 4 and has elastic tabs 10 which project into the recesses 5 and bear against circumferentially extending surfaces 11 on the cams 1. They thus exert a substantially radial force 12 and a reaction on the contact line 13 to produce a torque 8 on the cams. The spring strip 9 is fixed angularly and axially with respect to the cage 4 by lugs 15 on the cage 4 fitting in openings 16 in the strip.

Abstract: Cam-type freewheel, characterized by the fact that the cage is made in one piece in moulded material with roughly rectangular recesses taking the cams, and by the fact that the continuous strip spring is placed round the periphery of the cage and comprises, at right angles to each recess, one or more elastic tabs entering the recess and bearing against the base of the cam in the proximity of the inner bush and so exerting on it a roughly tangential and preferably slightly outwardly oblique lateral thrust, with the angular and axial immobility of the spring with respect to the cage being provided by studs or lugs carried by one of these components and entering openings made in the other.

Abstract: Apparatus for screwing, unscrewing, and handling large bolts such as stud bolts for the cover of the core tank of a nuclear reactor. A circular guide rail is positioned above the periphery of the core tank. A main chassis is suspended from and movable along the guide rail. The main chassis includes two vertical beams and a plurality of horizontal guide beams which extend over the core tank periphery toward the interior thereof. A secondary chassis includes a number of bars which cooperate with the guide beams to permit horizontal movement of the secondary chassis in a direction substantially perpendicular to the direction of movement of the main chassis. A screwing mechanism is vertically movable on the secondary chassis and includes a gripping device for gripping the screw and a jack for compensating for the weight of the screw. A second gripping device can be included for gripping a washer.

Abstract: A clutch release bearing is supported on a guide tube by an axially slidable support sleeve which has a radial flange. The inner ring of the bearing has a radial extension which is in surface-to-surface contact with one side of the guide tube flange to prevent tilting of the release bearing. The opposite side of the guide tube flange has elastic projections which are clamped by claws on the radial extension.

Abstract: A double-twist twister mechanism includes a pair of assemblies which rotate about oblique intersecting axes, support a nonrotating spool carrier and have portions extending through each other. The assemblies are connected together for concurrent rotation by an external elastic member which is passable over the spool carrier into engagement with concentrically arranged fasteners on both assemblies.

Abstract: The double torsion twisting mechanism includes a rotatable spindle which rotatably supports a bobbin. A coupling unit connected to the bobbin has its axis offset to the bobbin axis to prevent rotation of the bobbin. A yarn ballooning plate is secured to the spindle and rotates the coupling unit via a flexible membrane connected between the plate and the coupling unit. The flexible membrane is cut-out in the region of a radial yarn guide channel which rotates with the spindle.

Abstract: Spring 1 having principal undulations 2 inside which are formed windows 5 for the passage of cams 10, and secondary undulations 4. The cams are wedged between the edges 6 and 7 of these windows. The swinging of the cams is caused by the action of the swinging tongue 15 having a flat portion 17. An improvement in the synchronization of movement of the cams and a reduction in the wear of the device is obtained.

Abstract: A ball cage for a ball bearing of the angular contact type having a double row of balls with opposed angular contacts comprises a solid central portion which is bounded between two concentric cylindrical surfaces and between two parallel planes and has cells with part-spherical surfaces for receiving the balls in each axially directed side. Elastic lips having surfaces which form continuations of the part-spherical surfaces of the cells project from the central portion axially beyond the parallel planes and these lips permit the introduction of the balls into the cells in an axial direction and retain the balls in the cells elastically.

Abstract: A self-centering clutch release bearing, having means for enabling its axial sliding on a tube guide, enabling substantial radial movement of the clutch release bearing, and insuring axial pressure so that the clutch release bearing remains entered after radial movement. A ring slides directly on the tube guide, and a sleeve fits inside the bearing's inner race. The ring fits in the sleeve and radial end surfaces of the ring engage end surfaces of the sleeve. Either the sleeve or the ring has a groove whose axial ends engage radial walls of the other.

Abstract: Device having movable jaws for gripping the shank of a pin or bolt is provided with ridges or grooves on the jaws which mate with corresponding ridges or grooves on the shank. The jaws are mounted to slide toward and away from each other and this sliding movement is induced by linkage pivotally connected to the jaws. An abutment is provided for limiting the movement of one of the jaws so that actuation of the linkage causes movement of said one jaw until it strikes the abutment followed by movement of the other jaw.

Abstract: Hydraulic device for exerting a pre-stressing traction on bolts or pins comprises three stages, with each stage comprising a piston within a chamber. The thickness of the skirts of the piston increases from stage to stage in proportion to the pressure to which the piston of that stage is subjected during a stretching operation.

Abstract: In a known method of electrolytically marking metallic articles a hood having its bottom closed by a stencil with perforations is partially filled with an electrolyte and contains a cathode. An article to be marked is brought into contact with the stencil and constitutes the anode. The invention consists in maintaining the space within the hood at a partial vacuum sufficient to cause bubbles of air which have passed through the perforations in the stencil to flow upward in the hood, thus preventing electrolyte from seeping downward through said perforations.

Abstract: A spinning rotor for free fibers having axial extraction and a rotatable depending hollow shaft secured thereto and provided with two grooves receiving two rows of balls mounted in cylindrical cages and disposed in fixed exterior rings having oblique contact surfaces. These exterior rings are mounted in the bore of a bearing support and are maintained in spaced relation by a cross-piece of U-shape and an elastic washer, the cross-piece being axially and rotatably immobilized in the bearing support by a clamp or similar element.

Abstract: The mechanical properties within a part are determined as a function of depth in a non-destructive manner by punching the body with a series of punches having different radii of curvature. Using a plastic criterion with the data obtained the elastic limit of the body as a function of depth is determined as well as the residual self-stresses that exist in the part.