Abstract: Apparatus for producing gas, comprising: a reactor (R) that holds a determined volume arranged to contain two or more reactants and at least one gas; a connection circuit (S), arranged to put the reactor (R) in communication with a user (U); a supply device (2), arranged to supply at least one reactant to the reactor (R); a control module (MC), connected to the supply device (2); a control valve (5), connected to the control module (MC), which is arranged to regulate, following a command, the supply of gas to the user (U); a first pressure detector (6), arranged to detect a first pressure (P1) of the gas upstream of the control valve (5), which is connected to the control module (MC) and sends the control module (MC) a first signal indicating the pressure (P1) detected; a second pressure detector (7), arranged to detect a second pressure (P2) of the gas downstream of the control valve (5), which is connected to the control module (MC) and sends the control module (MC) a second signal indicating the pressure (

Abstract: A gas generator, comprising: a reactor (2), arranged to contain a preset quantity of reactants; a connection conduit (4), arranged to hermetically connect the reactor (2) to a user (U) of the gas produced; the reactor (2) comprises a container (21) equipped with an opening (22) provided with a breakable hermetic barrier (23); connection means (5) are arranged to allow the hermetic and removable connection of the container (21) to the connection conduit (4) and to determine the breaking of the hermetic barrier (23) following the connection between the container (21) and the connection conduit (4).

Abstract: The chain comprises a plurality of external links (2), each defined by a pair of parallel external plates (4, 5) and by two rotation pivots (6) interpositioned between the two external plates (4, 5). The chain also comprises a plurality of internal links (3), each defined by a pair of parallel internal plates (7, 8) and by two bushes (9) interpositioned between the plates and each internal link (3). Each of the rotation pivots (6) is inserted coaxially in a bush (9) and so defines an alternated succession of external links (2) and internal links (3) and defines with the bush (9) a spherical coupling surface. The chain also comprises anti-rotation elements (12) for reducing a possibility of rotation with respect to an alignment direction of each pair of adjacent links (2, 3).

Abstract: A command device for a bicycle gear change, comprising: a rotating drum (2) provided with a rotation axis (x) and being predisposed to rotate in opposite directions in order to wind at least a portion of a change-activating cable (3) on a lateral surface of the rotating drum (2); means for rotating, predisposed on command to rotate the rotating drum (2) in opposite directions according to predetermined angular steps; means for retaining predisposed to hold the rotating drum (2) in a position in absence of commands made to the means for rotating. The rotation axis (x) of the rotating drum (2) is perpendicular with respect to an advancement direction of the bicycle, that is, parallel to the rotation axis of the front wheel of the bicycle.

Abstract: The bicycle gear mechanism, in particular a rear wheel change mechanism, comprises a derailleur provided with a drive chain guide element. The derailleur comprises: an arm (2); a first attachment element (5), rotatingly constrained to the arm (2) by a first shaft (3), the first attachment element (5) being predisposed to connect the arm (2) to the bicycle frame; a second attachment element (6), rotatably constrained to the arm (2), the second attachment element (6) being predisposed to connect the arm (2) to an element (7) predisposed to guide the drive chain (30) of the bicycle; a mechanism predisposed to rotatingly connect the first shaft (3) and the second shaft (4); at least an actuator, operatively connected to the arm (2) and the bicycle frame, which actuator is predisposed to rotate the arm (2) about the first shaft (3).

Abstract: The chain comprises a plurality of external links (2), each defined by a pair of parallel external plates (4, 5) and by two rotation pivots (6) interpositioned between the two external plates (4, 5). The chain also comprises a plurality of internal links (3), each defined by a pair of parallel internal plates (7, 8) and by two bushes (9) interpositioned between the plates and each internal link (3). Each of the rotation pivots (6) is inserted coaxially in a bush (9) and so defines an alternated succession of external links (2) and internal links (3) and defines with the bush (9) a spherical coupling surface. The chain also comprises anti-rotation elements (12) for reducing a possibility of rotation with respect to an alignment direction of each pair of adjacent links (2, 3).

Abstract: A derailleur (10) is predisposed to translate a drive change (11) between at least two gears (12) rotating about a rotation axis (y). The derailleur (10) is mobile in one direction in rotation with respect to the bicycle frame by action of a cable (14) which by command is made to exert a traction force. In an opposite direction the derailleur (10) rotates, also by action of the cable (14), which is loosened by command, and by action of elastic means. The gear change comprises a retaining device (2) predisposed to maintain the derailleur (10), in absence of a command, in a predetermined angular position. The retaining device (2) comprises a fixed portion and a mobile portion. The fixed portion is associable to the bicycle frame, the mobile portion is solidly associable to the derailleur (10). The fixed portion, in determined angular positions of the derailleur (10), removably connects to the mobile portion.

Abstract: A command device for a bicycle gear change, comprising: a rotating drum (2) provided with a rotation axis (x) and being predisposed to rotate in opposite directions in order to wind at least a portion of a change-activating cable (3) on a lateral surface of the rotating drum (2); means for rotating, predisposed on command to rotate the rotating drum (2) in opposite directions according to predetermined angular steps; means for retaining predisposed to hold the rotating drum (2) in a position in absence of commands made to the means for rotating. The rotation axis (x) of the rotating drum (2) is perpendicular with respect to an advancement direction of the bicycle, that is, parallel to the rotation axis of the front wheel of the bicycle.

Abstract: The bicycle gear mechanism, in particular a rear wheel change mechanism, comprises a derailleur provided with a drive chain guide element. The derailleur comprises: an arm (2); a first attachment element (5), rotatingly constrained to the arm (2) by a first shaft (3), the first attachment element (5) being predisposed to connect the arm (2) to the bicycle frame; a second attachment element (6), rotatably constrained to the arm (2), the second attachment element (6) being predisposed to connect the arm (2) to an element (7) predisposed to guide the drive chain (30) of the bicycle; a mechanism predisposed to rotatingly connect the first shaft (3) and the second shaft (4); at least an actuator, operatively connected to the arm (2) and the bicycle frame, which actuator is predisposed to rotate the arm (2) about the first shaft (3).