Abstract: A brake assembly includes a reservoir body adapted to store a brake fluid and defining a cylinder bore, and a piston adapted to reciprocate inside the cylinder bore. The brake assembly also includes a base bracket pivotably coupled to a reservoir body and adapted to be mounted to a handlebar, and a handle pivotally coupled to the base bracket and adapted to pivot relative to the base bracket. A drive link is pivotable coupled to the reservoir body and is configured to pivot relative to the reservoir body to advance the piston inside the cylinder bore in response to the pressing of the handle. The handle is configured to be set at a plurality of angular positions with respect to the reservoir body by pivoting the base bracket relative to the reservoir body.

Abstract: A method of controlling an electric booster including a reaction disk, a boosting body and a pedal push rod connected to a pedal and configured to come into contact with the reaction disk, the electric booster being subjected to braking control according to a braking map, includes: a first braking control step of controlling and generating a reaction force at normal times in accordance with a pedal effort by compressing and expanding a fluid while moving the pedal push rod; and a second braking control step of controlling and generating the reaction force in accordance with the pedal effort only in a condition in which the reaction disk and the pedal push rod are in contact with each other by detecting a size of an air gap between the reaction disk and the pedal push rod.

Abstract: An embodiment of a robotic fabric has a first fabric layer and an actuator that is configured to have a first state and a second state. A property of the first fabric layer is different when the actuator is in the first state as compared to the property of the first fabric layer when the actuator is in the second state.

Abstract: The disclosure relates to a vertebral body implant including a flexible main body and at least one pedicle screw joint. The flexible main body is an integrally formed single piece having at least one joint-accommodating hole and at least one opening connected to the at least one joint-accommodating hole. The pedicle screw joint is an integrally formed single piece movably accommodated in the at least one joint-accommodating hole.

Abstract: An automotive vehicle includes a body having a passenger compartment and a pedal assembly disposed within the passenger compartment. The pedal assembly includes a brake pedal emulator housing and at least one pedal interface coupled to the housing. The vehicle also includes an actuator operably coupled to the brake pedal emulator housing. The actuator is configured to selectively move the housing and the pedal interface between a first position and a second position with respect to the passenger compartment. The vehicle further includes at least one controller in communication with the actuator. The controller is configured to, in response to satisfaction of a first operating condition, control the actuator to move the housing and the pedal interface to the first position, and, in response to satisfaction of a second operating condition, control the actuator to move the housing and the pedal interface to the second position.

Abstract: A braking device for a hydraulic motor vehicle braking system having an electromechanically driven booster stage and a ball screw drive. In order to provide a braking device which is of particularly compact, cost-effective and weight-saving construction and has short pedal strokes, and an easily adjustable pedal characteristic curve, at the same time enabling effective direct action in case of failure of the booster stage and comfortable haptic feedback at the pedal during normal operation, the actuating force from a piston rod is introduced into the spindle, wherein the piston rod can be moved axially to a limited extent relative to the spindle and a spring element is inserted in the flow of force of the actuating force between the piston rod and the spindle, which spring is compressed axially when the actuating force is introduced.

Abstract: A hydraulic operating device for a small vehicle including a bicycle is basically provided with a base member, an operating member, a piston, a handlebar fixing structure and a hydraulic reservoir tank. The base member includes a cylinder having a cylinder bore. The operating member is pivotally coupled to the base member about a pivot axis. The piston is movably disposed in the cylinder bore and operatively coupled to the operating member to move the piston within the cylinder bore. The handlebar fixing structure is coupled to the base member. The handlebar fixing structure defines a handlebar arrangement area. The hydraulic reservoir tank has a hydraulic fluid chamber fluidly connected to the cylinder bore. The hydraulic reservoir tank at least partially overlaps the handlebar arrangement area as viewed in a pivot axis direction parallel to the pivot axis of the operating member.

Abstract: A bicycle operating device comprises a base member, an operating member, and a hydraulic unit. The base member comprises a first end portion, a second end portion, and a gripping portion. The gripping portion is provided between the first end portion and the second end portion. The operating member is movably mounted to the base member from a rest position toward an operated position. The hydraulic unit is provided at one of the base member and the operating member. The hydraulic unit comprises a hydraulic cylinder and a piston. The hydraulic cylinder includes a cylinder bore. The piston is arranged in the cylinder bore. The piston is configured to be pulled from an initial position to an actuated position in response to a movement of the operating member from the rest position toward the operated position to supply a hydraulic pressure toward at least one bicycle component.

Abstract: In order to improve a master unit for vehicles, in particular for vehicles steered by a handlebar, comprising a housing, a master cylinder unit provided in the housing, an actuation unit for manually actuating the master cylinder unit with a push lever pivotable relative to the housing about a push lever pivot axis and with a push element transmitting a movement of the push lever to the master cylinder unit, which push element is provided on the push lever and, when the actuation unit is manually actuated, acts, via a pressure surface at a contact point, on a contact surface of the master cylinder unit, such that an optimal adaptation to the particular circumstances is possible, it is proposed that, in order to adjust a transmission ratio of the actuation unit with which the actuation unit acts on the master cylinder unit, a lever arm effective in the event of the actuation is adjustable between the contact point and the push lever pivot axis by means of an adjustment device.

Abstract: A hydraulic brake actuation device is provided that basically includes a housing, a master piston, a push rod, an actuation lever, a contact member and a support member. The housing includes a master cylinder. The master piston is slidably disposed in the master cylinder. The push rod is coupled to the master piston. The actuation lever is pivotally attached to the housing. The contact member contacts the actuation lever. The contact member also contacts the push rod that pushes the master piston. The support member is attached to the housing. The support member is a separate piece from the housing that guides the contact member.

Abstract: A brake or clutch actuating lever is rotatably connected to a support structure. An adjustment lever, mechanically distinct from the actuating lever, transmits the angular actuation stroke of the actuating lever to a brake or clutch actuation unit. The adjustment lever comprises a mechanism for adjusting the rest position of the adjustment lever, mechanically separate from the actuating lever.

Abstract: A pneumatic ratchet wrench includes a main body, an output unit, a driving unit, and a transmission unit. The main body has a handle section and a shrunk head section narrower than the handle section. The output unit includes a driving head for outputting a power. At least a major portion of the output unit is disposed within the shrunk head section. The driving unit is disposed within the main body for generating the power pneumatically. The transmission unit is disposed within the handle section for transmitting the power to the driving head.

Abstract: A hydraulic brake control apparatus for attaching to an open ended handlebar of a vehicle, the handlebar having a longitudinal axis. A brake housing is attachable to the handlebar, the brake housing including a first section residing outside the handlebar and abutting the open end of the handlebar, and a second section sized and shaped to be received inside the handlebar. A master cylinder is disposed within the first section, the master cylinder having a bore with a bore axis that is oriented transverse to said axis of the handlebar and a master cylinder actuator is in operative association with the master cylinder. A micro-adjust mechanism, a macro-adjust mechanism, and a clamp mechanism is also provided.

Abstract: A hydraulic brake control apparatus including a body portion, a hydraulic brake control mechanism, and a lever portion. The body portion has a first section configured to fit within an interior of a bar opening and a second section configured to be mounted outside of the interior of the bar opening. The hydraulic brake control mechanism includes a hydraulic brake pressure cylinder having a piston chamber therein, where at least a portion of the hydraulic brake control mechanism is housed within the first section of the body portion. The lever portion connected to the body portion and configured to actuate the hydraulic brake control mechanism. The body portion includes a port fluidly connected to the piston chamber by a conduit. The port is provided on the second section in order to allow bleeding of air from within the piston chamber when the body portion is mounted to the bar opening.

Abstract: A hydraulic brake mechanism is described including a housing. A master cylinder assembly is disposed within the housing, and the master cylinder assembly includes a fluid chamber. The fluid chamber includes a first chamber portion having a first diameter and a second chamber portion having a second diameter, with the first diameter greater than the second diameter. The fluid chamber includes a transition region between the first and second chamber portions. The mechanism includes a piston assembly having a piston disposed within the fluid chamber. A first seal is configured to sealingly engage between the first chamber portion and the piston, and a second seal is configured to sealingly engage between the second chamber portion and the piston. The mechanism includes an outlet port extending from the fluid chamber from or adjacent the transition region.

Abstract: An apparatus for actuating first and second engine valves comprises a rocker arm that receives motion from primary and auxiliary valve actuation motion sources at a motion receiving end of the rocker arm. A master piston residing in a master piston bore in the rocker arm is configured to received motion from the auxiliary valve actuation motion source. A slave piston residing in a slave piston bore in the rocker arm is configured to provide auxiliary valve actuation motion to the first engine valve. A hydraulic circuit is provided in the rocker arm connecting the master piston bore and the slave piston bore, and a check valve is disposed within the rocker arm, configured to supply hydraulic fluid to the hydraulic circuit. The apparatus may be incorporated into a system comprising a rocker arm shaft and the primary and secondary valve actuation motion sources, such as an internal combustion engine.

Abstract: A braking system for a vehicle includes a brake assembly, a pedal simulator and a branching device for transmitting the pedal travel of the brake pedal between the brake assembly and the pedal simulator, the branching device having a transmission and distribution linkage in a distribution housing, which is to be operated by the brake pedal. The transmission and distribution linkage includes an adjusting spindle, which is fixedly mounted in the housing and runs transversely to the adjustment direction, and at least one transmission rod supported on the adjusting spindle and held adjustably in the axial direction of the adjusting spindle as well as transversely to the axial direction.

Abstract: A hydraulic converter for a hydraulic brake system or clutch system, in particular, of a handlebar-steered vehicle, in particular of a bicycle, includes at least one hydraulic master device and a mechanical slave device for actuating the hydraulic master device. The hydraulic master device comprises a cylinder with a pressure chamber, a piston arranged in the cylinder displaceably along the axis of the cylinder, and the hydraulic converter having an adjustment device for adjusting the volume of the pressure chamber of the cylinder.

Abstract: A master for a hydraulic actuating element, with a cylinder, in which a piston is displaceably mounted, and a hand lever, with which the position of the piston in the cylinder can be influenced, and a fastening element which comprises a clamping part shaped complementarily to the inner cross section of the handlebar, which is equipped for being fastened in the handlebar by means of an internal clamping. Furthermore, the invention relates to a master, in which the hand lever and the piston are connected by a push rod, which comprises a first longitudinal portion, which is provided with an external thread, which engages in an internal thread on the hand lever, so that the distance between piston and hand lever can be adjusted by turning the push rod, and wherein the push rod comprises a second longitudinal portion, which is provided with a polygonal outer cross section, which bears against at least one second spring element.

Abstract: An actuator mounting, in particular, a clutch or brake mounting for a vehicle, includes a mounting housing (3) with an attachment shell (2) for attaching the mounting to a handlebar or a similar steering element, a hand lever (8) supported to rotate on the mounting housing (3), and a mechanical or hydraulic force transmission device arranged on the mounting housing (3). The actuator mounting includes a carrier plate (9) supported on the rotational bearing (7) in common with the hand lever (8) as an intermediate transmission element with multiple functions. The carrier plate (9) has contact points (16, 32, 34) for applying force to or tensioning the hand lever (8), the force transmission device, and the mounting housing stop (35).

Abstract: A master cylinder assembly includes a cylinder body, a piston member operably fitted therein, and a pressure valve assembly to establish a variable fluid output upon operation of the piston member. The cylinder body includes two or more pressure chambers to hold hydraulic fluid, each having a transfer port. The piston member includes two or more pistons respectively received in the pressure chambers, and is operable to move the pistons, in parallel, to transfer hydraulic fluid through the transfer ports. The pressure valve assembly includes a selector and is operable to direct fluid transferred through selected transfer ports out of the cylinder body through an outlet port by means of a movable valve member that establishes a passageway communicating the selected transfer ports with the outlet port. A pivot adjustment mechanism allows adjustment of the lever's mechanical advantage, and a stroke adjustment mechanism allows adjustment of the lever's rest position.

Abstract: An actuator mounting, in particular, a clutch or brake mounting for a vehicle, includes a mounting housing (3) with an attachment shell (2) for attaching the mounting to a handlebar or a similar steering element, a hand lever (8) supported to rotate on the mounting housing (3), and a mechanical or hydraulic force transmission device arranged on the mounting housing (3). The actuator mounting includes a carrier plate (9) supported on the rotational bearing (7) in common with the hand lever (8) as an intermediate transmission element with multiple functions. The carrier plate (9) has contact points (16, 32, 34) for applying force to or tensioning the hand lever (8), the force transmission device, and the mounting housing stop (35).

Abstract: A lever device for operating a hydraulic actuator for a motorcycle, comprises a support that can be connected to a bearing structure, a hydraulic actuator connected to the support, a main lever, pivotally connected to the support and intended to be operated by being moved close to or away from said hydraulic actuator, a control rod and an adjustment member that are interposed in series between the main lever and a piston of the hydraulic actuator such as to transmit an operating movement from the lever to said piston. The adjustment member pivots about an axis of adjustment and defines a seat that accommodates an end of the control rod. The seat is eccentric to the axis of adjustment, whereby rotation of the adjustment member changes the orientation of the control rod relative to the axis of rotation of the lever, and thus the lever ratio.

Abstract: A hydraulic brake actuation device is provided that basically includes a housing, a master piston, a push rod, an actuation lever, a contact member and a support member. The housing includes a master cylinder. The master piston is slidably disposed in the master cylinder. The push rod is coupled to the master piston. The actuation lever is pivotally attached to the housing. The contact member contacts the actuation lever. The contact member also contacts the push rod that pushes the master piston. The support member is attached to the housing. The support member is a separate piece from the housing that guides the contact member.

Abstract: An electric power booster (12) where driver command is monitored by a transducer (38) on an input rod (34). This signal is converted to the appropriate voltage/current and operates an electric motor (42). The motor output shaft (68) is connected to a planetary gear reducer (72) appropriately sized to provide no more than +/?1/4 turn of an eccentric cam (14). Two master cylinders (16, 18) power piston rods (22, 24) ride diametrically opposed on the cam surface (20). As the cam rotates the piston rods are forced out pressurizing the respective hydraulic circuits and thereby providing fluid to each brake circuit (28, 30). In the event of power failure as well as to augment the output of the motor, the input rod is mechanically linked directly to the cam offset from the center allowing the driver to manually rotate the cam thereby pressurizing the brake circuits.

Abstract: A master cylinder assembly for a hydraulic actuation system for a handlebar-steered vehicle including a fluid cavity having an adjustable length. The master cylinder assembly generally includes a housing, a piston assembly, an actuator and an adjuster. The housing is mountable to a frame member and includes a chamber having a fluid cavity with first and second regions. The first region is in fluid communication with the hydraulic actuation system. The piston assembly includes a piston slidably disposed within the fluid cavity. The actuator is operatively connected to the housing and operatively connected to the piston to slidably displace the piston between an open fluid circuit position permitting fluid flow between the first and second regions and a closed fluid circuit position blocking fluid flow between the first and second regions. The adjuster is operatively connected to the housing to adjust a length of the fluid cavity.

Abstract: A hydraulic brake lever assembly includes a master cylinder, a master piston, and a floating piston. Both of the master piston and the floating piston are sealingly and movably received in the master cylinder. The master piston has a passage diametrically defined therein and extending therethrough for receiving a bias mechanism. The floating piston has a through hole for coaxially and sealingly receiving the master piston. The floating piston has two raceways radially and symmetrically extending from the through hole therein. The bias mechanism is movably disposed between the two raceways. Each raceway has a trough defined in a bottom thereof. The bias mechanism moves along the troughs and the raceways to provide the effort of multi-stage movement and different braking feel.

Abstract: A hydraulic assembly for a hydraulic disc brake system that includes a housing defining a cylinder, a piston received in and moveable within the cylinder, a first lever operatively associated with one of the piston or the cylinder, and a second lever operatively associated with the other of the piston or the cylinder. Moving the first lever pushes one of the piston or the cylinder in a first direction, and moving the second lever pulls the other of the cylinder or the piston in a second direction. In a preferred embodiment, the piston has a non-actuated position and a fully actuated position, and the piston is biased towards the non-actuated position, and wherein the cylinder has a non-actuated and a fully-actuated position, and the cylinder is biased towards the non-actuated position.

Abstract: A brake actuating unit for motor vehicles includes a brake master cylinder, a booster stage which is connected in front of the brake master cylinder, and a drive unit for driving the booster stage. In order to make comfortable braking operations possible, there is provision for the transmission both of the actuating force and of the boosting force to the primary piston of the brake master cylinder to take place by a force transmission module which has at least one elastic element and is arranged in the primary piston.

Abstract: A master cylinder assembly for a hydraulic actuation system for a handlebar-steered vehicle. The assembly includes a housing mountable to a frame member of the handlebar-steered vehicle and having a chamber including a fluid cavity with first and second regions. The first region is in fluid communication with the hydraulic actuation system. A piston is slidably disposed in the fluid cavity. An actuator is operatively connected to the housing and operatively connected to the piston to slidably displace the piston between an open fluid circuit position and a closed fluid circuit position. A first seal is disposed on either the piston or a wall of the fluid cavity. The first seal is configured to be in sealing engagement between the fluid cavity and the piston with the piston in the closed fluid circuit position to block fluid flow between the first and second fluid cavity regions.

Abstract: A bicycle hydraulic brake actuation device includes a hydraulic master cylinder housing having a bore, a master piston and a radial seal received in the bore a push rod and a lever. The push rod is configured to move the master piston and the radial seal between a neutral position and a braking position. The lever is pivotally attached to the housing for pivotal movement between an at rest position and a brake actuation position. The lever includes a contact surface configured and arranged to move the push rod as the lever is pivoted between the at rest position and the brake actuation position. Further, the push rod includes at least one roller configured to contact to the contact surface of the lever.

Abstract: A hydraulic brake lever assembly includes a master cylinder, a master piston, and a floating piston. Both of the master piston and the floating piston are sealingly and movably received in the master cylinder. The master piston has a passage diametrically defined therein and extending therethrough for receiving a bias mechanism. The floating piston has a through hole for coaxially and sealingly receiving the master piston. The floating piston has two raceways radially and symmetrically extending from the through hole therein. The bias mechanism is movably disposed between the two raceways. Each raceway has a trough defined in a bottom thereof. The bias mechanism moves along the troughs and the raceways to provide the effort of multi-stage movement and different braking feel.

Abstract: In order to create a hydraulic transmitting device for vehicles, in particular, for vehicles steered by handlebars, comprising a housing with a hydraulic master cylinder, in which a movable piston is arranged, an actuating lever movable relative to the housing and a push rod transferring movement of the actuating lever to the piston, wherein the push rod is supported on the actuating lever, wherein the push rod is adjustable in the direction of a longitudinal axis as a result of rotation about this axis and wherein the push rod can be secured relative to the actuating lever in specific rotary positions around the longitudinal axis by means of a locking device, with which the assembly thereof is less complicated it is suggested that the locking device comprise a locking element, that the locking element have at least one locking vane and that the at least one locking vane abut with a locking surface on a locking section of the push rod deviating from a circular cross section in a flexible manner and acted upon

Abstract: A method of varying a rest position and a length of an actuation arc of a lever in a hydraulic disc brake system. The hydraulic disc brake system comprises a master cylinder including a cylinder having a first end and second end and a port communicating with a hydraulic fluid reservoir between the first and the second cylinder ends. A piston is received in the cylinder. The piston has a seal between the cylinder and the piston and the piston is movable within the cylinder by a lever operatively associated therewith to selectively pressurize hydraulic fluid within the cylinder by moving the seal between the port and the second end of the cylinder. The hydraulic disc brake system further comprises a caliper in fluid communication with the master cylinder. The caliper has a pair of brake pads operatively associated with a disc received therebetween. The caliper is actuated by movement of the lever in an actuation arc between a rest position and an engagement point with the pads in engagement with the disc.

Abstract: A master cylinder assembly for a hydraulic actuation system for a handlebar-steered vehicle including a fluid cavity having an adjustable length. The master cylinder assembly generally includes a housing, a piston assembly, an actuator and an adjuster. The housing is mountable to a frame member and includes a chamber having a fluid cavity with first and second regions. The first region is in fluid communication with the hydraulic actuation system. The piston assembly includes a piston slidably disposed within the fluid cavity. The actuator is operatively connected to the housing and operatively connected to the piston to slidably displace the piston between an open fluid circuit position permitting fluid flow between the first and second regions and a closed fluid circuit position blocking fluid flow between the first and second regions. The adjuster is operatively connected to the housing to adjust a length of the fluid cavity.

Abstract: A master cylinder assembly for a bicycle disc brake having a housing defining a cylinder, a piston received in the cylinder, a lever pivotably attached to the housing, and an adjustment guide body that is operatively associated with the piston. The piston is moveable within the cylinder between a select starting position and a pressurized position. The lever is operatively associated with the piston to move the piston from the select starting position to the pressurized position as the lever is pivoted between a rest position and a fully-actuated position. The adjustment guide body is pivotable between a first position and a second position for adjusting the select starting position of the piston.

Abstract: A bicycle hydraulic brake actuation device includes a hydraulic master cylinder housing having a bore and a push rod guide surface, a master piston and a radial seal received in the bore, a push rod and a lever. The push rod is supported by the push rod guide surface for sliding movement within the hydraulic master cylinder housing. The push rod is configured to move the master piston and the radial seal from a neutral position to a braking position. The lever is pivotally attached to the housing for pivotal movement between an at rest position and a brake actuation position. The lever is also configured and arranged to move the push rod and the master piston from the neutral position toward the braking position as the lever is pivoted between the at rest position and the brake actuation position.

Abstract: A hydraulic pressure feeder suppresses wavy motions and bubbles in working oil in a reservoir tank. A hydraulic braking device includes a master cylinder mounted to a handle bar to accommodate therein a piston mechanism. A reservoir tank replenishes the piston mechanism with working oil. A brake lever is mounted to the master cylinder to drive the piston mechanism. The master cylinder is arranged forwardly of the handle bar and the reservoir tank is provided on the master cylinder to cover an upper portion of the master cylinder.

Abstract: A bicycle hydraulic brake actuation device includes a hydraulic master cylinder housing having a bore, a master piston and a radial seal received in the bore a push rod and a lever. The push rod is configured to move the master piston and the radial seal between a neutral position and a braking position. The lever is pivotally attached to the housing for pivotal movement between an at rest position and a brake actuation position. The lever includes a contact surface configured and arranged to move the push rod as the lever is pivoted between the at rest position and the brake actuation position. Further, the push rod includes at least one roller configured to contact to the contact surface of the lever.

Abstract: A master cylinder assembly for a hydraulic actuation system for a handlebar-steered vehicle. The assembly includes a housing mountable to a frame member of the handlebar-steered vehicle and having a chamber including a fluid cavity with first and second regions. The first region is in fluid communication with the hydraulic actuation system. A piston is slidably disposed in the fluid cavity. An actuator is operatively connected to the housing and operatively connected to the piston to slidably displace the piston between an open fluid circuit position and a closed fluid circuit position. A first seal is disposed on either the piston or a wall of the fluid cavity. The first seal is configured to be in sealing engagement between the fluid cavity and the piston with the piston in the closed fluid circuit position to block fluid flow between the first and second fluid cavity regions.

Abstract: A dual lever hydraulic brake assembly is described. The brake assembly comprises two levers operatively connected to a hydraulic brake system. A hydraulic assembly is also described wherein a lever is operatively connected to a master cylinder such that moving the lever in an actuating direction moves the master cylinder in a first direction.

Abstract: A method of adjusting a lever actuated bicycle hydraulic disc brake master cylinder. The disc brake master cylinder has a housing defining a cylinder having first and second ends and a port communicating with a fluid reservoir between the first and second ends. A piston is received in the cylinder and the piston has a seal having a leading seal edge between the piston and the cylinder. The lever is operatively associated with the piston to move the piston from an unactuated position with the leading seal edge a select distance between the port and the first end of the cylinder to an actuated position between the port and the second end of the cylinder.

Abstract: An electrically driven power brake booster having an electrically driven actuator. A lever is pivotably attached to a first pivot point coincident with a the pivot point of the operator controlled primary brake pedal lever. The lever has a first end and a second end, with the first end being attached to a brake rod of a master cylinder of a brake system and the second end being attached to the actuator. The actuator is activated by a signal indicating that braking is desired. This activation includes providing a first force to the second end sufficient to augment a second force from a brake pedal provided to the first end on the brake rod.

Abstract: Apparatus for controlling brakes in bicycles and the like, to be used, in particular, for disc brakes mounted on bicycles, with a pump (8) connected with a relevant reservoir (88) for the fluid of the hydraulic circuit, and comprising a piston (89) sliding within a relevant chamber (80) provided with one or more ports (83, 84) for connection with said reservoir (88), said piston being so shaped as to close/open said ports (83, 84) upon its displacement along said chamber (80), the apparatus being characterized in that the idle stroke of the piston (89) inside the said chamber (80) is adjustable by a rotation of the same piston (89) about its longitudinal axis.

Abstract: A bicycle hydraulic brake actuation device includes a hydraulic master cylinder housing having a bore, a master piston and a radial seal received in the bore a push rod and a lever. The push rod is configured to move the master piston and the radial seal between a neutral position and a braking position. The lever is pivotally attached to the housing for pivotal movement between an at rest position and a brake actuation position. The lever includes a contact surface configured and arranged to move the push rod as the lever is pivoted between the at rest position and the brake actuation position. Further, the push rod includes at least one roller configured to contact to the contact surface of the lever.

Abstract: A bicycle hydraulic brake actuation device includes a hydraulic master cylinder housing having a bore and a push rod guide surface, a master piston and a radial seal received in the bore, a push rod and a lever. The push rod is supported by the push rod guide surface for sliding movement within the hydraulic master cylinder housing. The push rod is configured to move the master piston and the radial seal from a neutral position to a braking position. The lever is pivotally attached to the housing for pivotal movement between an at rest position and a brake actuation position. The lever is also configured and arranged to move the push rod and the master piston from the neutral position toward the braking position as the lever is pivoted between the at rest position and the brake actuation position.

Abstract: In a lever device for a hydraulic operation where hydraulic pressure is generated in a master cylinder by rotation of a lever, to make invariable an operation of a pushrod, which operates a piston of the master cylinder by being pushed at one end thereof by an adjuster of the lever, irrespectively of an adjustment of the adjuster. The lever is supported by a rotational shaft to be rotatable around the rotational shaft relative to the master cylinder, while a knocker member separate from the lever is supported to be coaxially rotatable. A knocker portion of the knocker member receives an end of the pushrod, which operates the piston. A positional relationship between the pushrod and the knocker portion is made invariable irrespectively of a change in a distance between the adjuster and the knocker portion by an adjustment of the adjuster.

Abstract: A master cylinder which has an unusual ability to limit space requirements, to be fitted in vehicles controllable by handlebars, comprises a cylinder body provided with a seat for housing a portion of the handlebar. A chamber for slidably housing a piston extends along an axis inside the cylinder body. A manual control lever which acts on the piston is mounted on the cylinder body for pivoting about its fulcrum in a plane. The axis along which the chamber for slidably housing the piston extends intersects the plane of pivoting of the control lever at a point.

Abstract: An oil pressure generator for a vehicle is disclosed, including a bar-shaped steering handle having a pipe structure, a lever pivotally mounted in the vicinity of an end portion of the handle, and a master cylinder for a hydraulic brake or a hydraulic clutch, the master cylinder being configured to house a piston movable according to an operation of the lever, wherein the master cylinder is located within the handle.

Abstract: A master cylinder for a hydraulic disc brake includes a housing defining a cylinder, the cylinder having a first and second end along its axis. A piston is received in the cylinder and has a radial seal between the piston and the cylinder. A lever is pivotably associated with the housing for pivoting between a rest position and an actuated position relative to the housing. A push rod is operatively associated with the piston and the lever to move the piston axially within the cylinder as the lever is actuated between the rest and actuated positions. A threaded engagement between a first end of the push rod and the lever is configured to cause movement of the rest position of the lever relative to the housing when a rotating force is applied to the push rod causing axial rotation of the push rod. An indexing structure is operatively associated with the push rod for providing index axial rotation of the push rod upon application of the rotating force to the push rod causing axial rotation of the push rod.