Abstract: A control device for the gear change of a bicycle comprises a single operating lever, preferably provided with two distinct arms for the gear change up shifting and down shifting, respectively, to which a ratchet mechanism is associated. The ratchet mechanism comprises a pair of opposed teeth adapted to cooperate with a ratchet wheel which is associated to a control rotor. In the application on a racing bicycle, the control rotor is rotatably mounted around an axis parallel to the longitudinal direction of the bicycle.

Abstract: A power operated gear change assembly for bicycles, which includes a gear change whose derailleur is displaceable by an electric geared motor and associated power supply accumulator, operated through a manual control device or detector for detecting the derailleur displacement, and a control circuit for controlling operation of the electric geared motor. The electric geared motor is directly fitted on the derailleur of the gear change, and the detector includes a transducer device placed in a remote position relative to the derailleur of the gear change and operatively connected thereto through a transmission device. The electric accumulator is rechargeable by means of a dynamo-electric unit incorporated in the derailleur of the gear change.

Abstract: A sprocket assembly for bicycles includes at least two sprockets with different diameters arranged side by side, the larger diameter sprocket having a tooth for supporting the chain during the displacement of the latter from the smaller diameter sprocket to the larger diameter sprocket. This tooth has, to this end, a stepped support surface arranged on the side opposite to that facing the smaller diameter sprocket.

Abstract: A brake for bicycles includes a pair of levers each having a holding arm for a brake shoe. The first lever is articulated about a first pivot pin secured to the bicycle frame. A linking element is secured to the pivot pin and carries a second pivot pin parallel to the first pivot pin for articulating the second lever. A spring tends to hold the arms of the two levers apart and a device is provided for adjusting the spacing of the arms of the levers. This adjustment device includes a rocking member articulated about the second pivot pin and engaging one of the pair of levers and an adjustable threaded member on the other of the pair of levers.

Abstract: A safety pedal for bicycles includes a spring which includes a retaining arm for locking a metal plate fixed to a shoe sole on the pedal. The spring includes a spiral portion which holds the retaining arm in the locking position. Furthermore, from the spiral portion there extends a single radial arm, arranged on one side with respect to the longitudinal median plane of the pedal, which acts as a torsion bar for allowing swinging movements of the retaining arm when the plate is rotated in the general plane of the pedal to release the plate from the pedal.

Abstract: A combined gear change control and brake unit for a bicycle comprises a first actuating lever adjacent the rear of the brake lever and a second actuating lever projecting horizontally towards the middle of the handlebar, which respectively control ratchet devices for controlling upward or downward selection of the various transmission ratios.

Abstract: The gears associated with a bicycle pedal crank are mounted by means of a splined coupling on a hub fixed rigidly to the body of the pedal crank.

Abstract: A twist-grip device for operating the gears of a bicycle includes indexing associated with the hand-grip for snap-locating the hand-grip in the various positions corresponding to the engagement of the various gear ratios. The device includes a spring which biasses the hand-grip in the opposite sense from the sense of biassing of the spring of the derailleur which effects the engagement of the various gear ratios. The device also includes a screw for adjusting the average torque which needs to be applied to the hand-grip to snap-rotate the hand-grip between two successive positions. The rotation of the screw varies the preloading of a resilient expandable bush associated with the indexing pin springs.

Abstract: A device for attaching a shoe to a bicycle pedal, comprising a pedal body and a counter-member fixed to the sole of the shoe and adapted to be fitted to the body of the pedal. Attachement is achieved by means of a tooth which is carried by the counter-member and engages a recess formed in the body of the pedal so as to prevent the backwards displacement of the counter-member relative to the body of the pedal. A step carried by the counter-member cooperates in the body of the pedal and prevents the upward detachment of the counter-member.

Abstract: A freewheel for bicycles has a plurality of gears each of which, with the exception of the one with the smallest diameter, has teeth arranged in successive sets of three constituted each by teeth of three different types. A first type of tooth has a face which is recessed relative to the corresponding flat face of the gear. A second type of tooth has a groove formed in the top surface of the tooth and extending circumferentially of the gear. A third type of tooth has a top chamfer on its face situated on the side opposite the recessed face of the first tooth.

Abstract: A support for brake-operating levers adapted for connection to a handlebar of a bicycle includes a pin for the articulation of an operating lever for the front or rear derailer, which is mounted on an auxiliary body whose position is adjustable relative to the support. The auxiliary body may be connected to a lever support mounted on the handlebars in a configuration such that the operating lever is placed above or below the median plane of the support.

Abstract: A control device adapted to be mounted on a handlebar of a bicycle includes a support body having a first element adapted to be rigidly connected to the handlebar and a second element pivotally mounted on the first element for rotation about an axis relative to the first element. A projection on the second element extends radially with respect to the axis into a recess in the first element and a pair of screw members engage the projection on opposite sides thereof to adjust the position of the second element relative to the first element and to secure the second element in the adjusted position. A control lever is pivoted on the support body and is adapted to operate a control cable.

Abstract: A safety device for bicycles, for preventing unscrewing, comprises a ring element which can be mounted coaxially on the outer ring of the upper steering bearing and on the lock nut to lock them in position on the tubular sleeve of the fork mounted rotatably in the steering tube of the frame. The ring element is clamped onto the ring of the bearing and the lock nut so as to prevent the accidental unscrewing of the lock nut. It also has a radial appendage which is adapted to act as an abutment for the end of the sheath of a flexible brake-operating cable.

Abstract: A device for preventing the rotation of a bicycle pedal relative to its pin comprises a locking element carried by the pedal and movable, as a result of the engagement of the cyclist's shoe on the pedal, from a position of engagement with the pin, towards which the locking element is biassed by a resilient spring, to a release position in which the pedal is free to rotate relative to the pin. The locking element is guided for linear sliding in the body of the pedal between the engagement and release positions.

Abstract: In a brake-operating device for cycles, motorcycles and the like, of the type comprising a lever articulated to a support structure and connected to a flexible brake-operating cable by an auxiliary member is provided for adjusting the distance between the axis of articulation of the lever and the axis of the flexible cable near the point of connection of the flexible cable to the lever.

Abstract: A pedal for racing bicycle comprises a pedal body carrying a toe clip at the front with a strap for retaining a cycling shoe and a transverse stop at the rear which is adapted to engage a recess formed in a cleat fitted to the sole of the shoe. The transverse stop is movable relative to the body of the pedal so as to enable the cleat to be released in use as a result of a backward and/or rotary force applied by the shoe above a threshold value.

Abstract: A rear derailer for bicycles comprises a first body for fixing to the bicycle frame, a second body which carriers two chain-guide wheels and is connected to the first body by means which enable the second body to be displaced relative to the first body, a metal operating cable having one end fixed to the means for displacing the second body relative to the first body, and a cable-guide sheath provided at one end with a support element having a hemispherical end portion which is supported for rotation by a correspondingly-shaped seat formed in the first body. The support element is provided with a tubular extension for guiding the cable, the extension projecting from the hemispherical portion, passing through the first body, and extending almost to the fixed end of the cable.

Abstract: In a rear derailleur of the type including an articulated parallelogram joint, the axes of articulation of the two connecting rods of the articulated parallelogram to the upper body of the derailleur are inclined to the longitudinal plane of the bicycle in the position of mounting of the derailleur on the bicycle. These axes are also arranged with one outwardly of and higher than the other so that the plane containing them is also inclined to the axis of the rear wheel of the bicycle. It is possible to arrange for the lower body of the derailleur to be displaced when the chain is derailed, the chain transmission wheel being kept at a substantially constant distance from the sprocket which is engaged by the chain from time to time.

Abstract: A device for operating the gear change of a bicycle comprises a main body mounted rotatably on a support pin and provided with an operating lever. A member driven by the main body and whose rotation is prevented by friction coupling means is also mounted rotatably on the support pin. Interposed between the driven member and the main body are one-way engagement means for coupling the driven member to the main body for rotation only when the operating lever is rotated in the direction of return of the derailer spring. These one-way engagement means are controlled directly by the same operating lever, which is constituted by an element separate from the main body and articulated to this body.

Abstract: In a gear selector for controlling speed gears with a spring-loaded derailleur for sports and racing bicycles, there are associated with the gear selector operating lever (1), mounted rotatable against friction on a pivot (2), a snap-action mechanism controlling a plurality of lever positions with which a like number of positions of correct alignment of the speed gear with the various sprockets of the free wheel correspond, and means for activating and deactivating said mechanism on command. This snap-action mechanism comprises a notched member (4) with notches (18) in different positions, which is immediately interchangeable so as to adapt the gear selector to the control of any type of free wheel and of the most varied combinations of sprockets in free wheels, and at least one pawl for engaging the notches of said member and constructed integrally (5) with the spring which urges it into said engagement.