Abstract: A quick connect coupling for use in a hydraulic clutch control system including a hydraulic master cylinder and a hydraulic slave cylinder. One of the coupler members of the quick connect coupling includes a central axial passage defining an inlet at one end of the passage and including a diaphragm positioned at the other end of the passage at right angles to the passage in fluid communication with fluid flowing through the passage. The passage further includes a radial passage portion communicating with the central passage and extending to a fluid port for the coupler member. Hydraulic fluid flowing through the coupler member communicates with an inboard face of the diaphragm so that the diaphragm functions to attenuate pulsations in the hydraulic fluid and preclude transmission of the pulsations rearwardly in the system to the clutch pedal.

Abstract: A tube-line pressure sensor of a medical-appliance driving apparatus detects the interior pressure of a tube line. If the pressure detected by a tube-line pressure sensor is equal to or less than a predetermined value, a first solenoid valve is closed, while a second solenoid valve is opened, whereby a gas is supplied from a secondary gas tank to the tube line. The amount of gas supplied to the tube line is calculated based on a pressure change in the tank detected by a tank pressure sensor. In actual use, natural gas leakage during normal operation can be clearly distinguished from abnormal gas leakage due to an accident. The interior pressure of the tube line is detected at a time when the balloon is about to inflate from the deflated state, and a gas supply system supplies the driving gas to the tube line so that the detected pressure becomes a preset pressure value. A controller can change the preset pressure value.

Abstract: The present invention is directed to a hydraulic brake apparatus for applying braking force to each wheel of a vehicle in response to depression of a brake pedal. An auxiliary pressure source is provided for pressurizing the brake fluid in the reservoir to discharge power pressure. A control piston is slidably disposed in a cylinder body ahead of a master piston to be movable in response to movement thereof, so that a regulator chamber is defined ahead of the control piston, and a rear end thereof is exposed to a pressure chamber. A pressure increase valve is provided for communicating the regulator chamber with the auxiliary pressure source or cutting off the communication in response to movement of the control piston. A pressure decrease valve is provided for communicating the regulator chamber with the reservoir or cutting off the communication in response to movement of the control piston.

Abstract: The invention relates to a hydraulic brake system having a tandem master cylinder as the brake force set-point value transducer for braking by external force, downstream of which are disconnection valves for hydraulically disconnecting the master cylinder from wheel brake cylinders for external force braking. To achieve a pedal travel when the disconnection valves are closed, the invention proposes a lengthened idle travel of the pistons of the master cylinder, for instance by increasing a valve opening stroke of central valves integrated with the pistons. A travel-dependent pedal force is realized with simulator spring elements that act upon the pistons.

Abstract: The invention is directed to a hydraulic brake apparatus which includes a master cylinder having a cylinder body and a master piston slidably disposed therein for defining a pressure chamber ahead of the master piston and a power chamber behind the master piston. A control piston is slidably disposed in the cylinder body ahead of the master piston to define the pressure chamber behind the control piston, and adapted to be moved in response to movement of the master piston. An auxiliary pressure source is provided for pressurizing brake fluid to generate a power pressure, and a valve assembly is communicated with the auxiliary pressure source to regulate the power pressure into a regulated pressure in response to movement of the control piston. The valve assembly is adapted to supply the regulated pressure into the power chamber to assist the operation of a brake pedal.

Abstract: The invention is directed to a hydraulic brake apparatus which includes a master cylinder having a cylinder body and a master piston slidably disposed therein for defining a pressure chamber ahead of the master cylinder and a power chamber behind the master piston. A control piston is slidably disposed in the cylinder body ahead of the master piston to define the pressure chamber behind the control piston, and adapted to be moved in response to movement of the master piston. An auxiliary pressure source is provided for pressurizing brake fluid to generate a power pressure. A valve assembly having a regulator chamber defined ahead of the control piston is communicated with the auxiliary pressure source to regulate the power pressure into a regulated pressure in response to movement of the control piston, and adapted to supply the regulated pressure into the power chamber to assist the operation of the manually operated member.

Abstract: The invention relates to a hydraulic fluid reservoir comprising a substantially cylindrical wall (1), an upper wall (2) and a lower wall, and two tubular connection pieces (4, 5) for entering and discharging hydraulic fluid into and out from the interior of the reservoir. The two tubular connection pieces, an inlet connection piece (4) and an outlet connection piece (5) are substantially tangentially connected to the cylindrical wall (1) to preserve the momentum of a fluid fed into the reservoir.

Abstract: The invention is directed to a hydraulic brake apparatus which includes a master cylinder having a cylinder body and a master piston slidably disposed therein for defining a pressure chamber ahead of the master piston and a power chamber behind the master piston. The master piston includes a first piston connected to a brake pedal and a second piston slidably disposed relative to the first piston. The rear ends of the first piston and second piston are exposed to the power chamber, and the front ends of the first piston and second piston are exposed to the pressure chamber. An engaging member is provided for engaging the second piston with the first piston upon forward movement of the second piston. A control piston is slidably disposed in the cylinder body ahead of the master piston to define the pressure chamber behind the control piston.

Abstract: A hydraulic pressure generator having a body (1) with a first bore (11) therein for receiving a cylinder (21) of a piston assembly (2) to define a pressure chamber (12). The cylinder (21) has a second bore (211) for receiving an auxiliary piston (22) which defines a variable volume compensation chamber (23). The compensation chamber encloses a deformable member (5) which is adapted to exert an elastic force between the auxiliary piston (22) and a closed end (210) of cylinder (21). The compensation chamber (23) communicates with the pressure chamber (12) through a restriction (221) formed in a longitudinal duct (222) of the auxiliary piston (22). A sealing member (4) borne by a portion (222) of the auxiliary piston (22) closes the pressure chamber (12) such that the elastomeric member (5) dampens pressure differences between the pressure chamber (12) and compensation chamber (23).

Abstract: A reservoir for a master cylinder including an upper reservoir section forming a portion of a float damping chamber and a lower reservoir section forming a portion of the float damping chamber. The upper reservoir section and the lower reservoir section are so dimensioned so that when they are fastened together, they define the float damping chamber at least one metering orifice formed along their mating surfaces. This metering orifice allows fluid to flow between the float damping chamber and the reservoir of the master cylinder in a controlled manner. Thus, a float device provided within the float damping chamber will not be susceptible to initiating false signals.

Abstract: A brake pressure generating device for a vehicle includes a cylinder body, a pressure source connected with the cylinder body for generating a pressure, a first piston slidably disposed in the cylinder body for being operated by a brake pedal of the vehicle, a sleeve member disposed in the cylinder body for forming a pressure chamber with the first piston at one end thereof and for being exposed to a regulated pressure chamber at the other end thereof, and a spool valve slidably disposed in the sleeve member for regulating the pressure of the pressure source. A second piston is slidably disposed in the sleeve member for receiving the pressure in the pressure chamber at one end thereof and for being connected with the spool valve to impart a force the spool valve. An elastic member is disposed in the cylinder body and receives a pressure in the regulated pressure chamber. A reaction member is connected with the spool valve at one end thereof and is in contact with the elastic member at the other end thereof.

Abstract: A fastener installation tool of the push/pull type including an air piston driving a hydraulic piston and further including a head piston driven by the hydraulic piston and coacting with the hydraulic piston to form a closed loop hydraulic circuit. The hydraulic piston is a compound piston including a primary piston and a secondary piston mounted in a blind bore in the upper end of the primary piston. When hydraulic pressures in the closed loop hydraulic circuit exceed a predetermined limit, the secondary piston moves downwardly, against the bias of an internal spring, relative to the primary piston to reduce the overall volume of the compound piston and thereby reduce the pressure in the closed loop hydraulic circuit.

Abstract: A device for the prevention of the abuse of a dry-plate clutch (1) for a motor vehicle with a manual gearbox, wherein the device acts jointly with a hydraulic master cylinder (3) and a related slave cylinder (4) in the operation of the clutch (1). The device comprises a valve unit (20) which is installed hydraulically in series with and between the master cylinder (3) and the slave cylinder (4). The valve unit opens when the valve body (32) is moved towards the slave cylinder (4). A first passage (53) which extends in the valve body (32) or in the valve housing (21) permits restricted fluid flow through the valve (20) when the valve unit (20) is closed. A device (33,35,41) keeps the valve unit (20) open when the clutch is located in positions between a position of maximum disengagement and a second position located close to the position in which the clutch begins to engage.

Abstract: An inlet union for master cylinder of the present invention is so constructed that a flange portion is disposed at the periphery of a duct member, a circular raised portion whose outside diameter is smaller than that of the flange portion is integrally formed, at least one convex portion protruding radially is disposed at the outer periphery of the circular raised portion, attaching holes for the duct members are disposed in the top plate of an attaching cover, a plurality of concave portions corresponding to the convex portion of circular raised portion of the flange portion are disposed at the inner periphery of the attaching hole so that the convex portion of the duct member selectively engages with the concave portion of the attaching cover, and a mounting portion is formed at the inner periphery of the attaching cover to mount the outer periphery of the flange portion.

Abstract: A master cylinder having first and second compensating ports with a plurality of openings therein for rapidly allowing fluid communication between a reservoir and first and second chambers to maintain the master cylinder in a ready condition with respect to an input force in the development of pressurized fluid to effect a brake application.

Abstract: The master cylinder comprises a body 10 formed with a bore 13, a piston 19 slidable in the bore to discharge hydraulic working fluid from the bore and an annular reservoir 17 for communication with the bore 13 and which is concentric with the bore. The reservoir contains a flexible diaphragm 30 which separate fluid in the reservoir 17 from ambient air. The use of the concentric reservoir 17 and diaphragm 30 makes the master cylinder particulary compact and suitable for use in a pre-filled clutch release system of a vehicle.

Abstract: The present invention is directed to a cap assembly for screwing into an opening of a reservoir for storing a fluid therein. Around the cap, formed is a sealing groove in which a sealing member is disposed. The sealing member has a sealing portion which extends toward the inner periphery of the opening, and a pair of contacting portions which extend axially toward each inner side of the sealing groove in spaced relationship with each inner side of the sealing groove by a predetermined clearance respectively. The sealing member is formed around the periphery thereof with grooves for allowing the sealing portion and contacting portions to be deflected in response to a sliding motion of the sealing member when the cap assembly is screwed into the opening.

Abstract: In a master cylinder and booster assembly for a vehicle hydraulic system, the booster has a housing provided with a bore, an inlet connected to a source of hydraulic pressure, and an outlet connected to a booster reservoir, input and boost pistons working in the bore and a boost chamber for pressurization by fluid from the source, under the control of valve means, to actuate the boost piston which in turn actuates the master cylinder. The booster has a permanent connection between the boost chamber and the outlet and a connection between the source and the boost chamber which is closed when the booster is inoperative and open during operation. In order to provide a supply of fluid for a master cylinder reservoir, the booster has a feed passage leading from the bore to the master cylinder reservoir and an overflow passage leading from that reservoir to the outlet.

Abstract: The present inventive relates to a master cylinder (1 ) with elastomeric central valves (20) which can be opened in opposition to a relatively high pressure in the pressure chambers (8 and 9) without damage. The sealing face (29) of the valve member (26) is in the form of a hollow cylinder protruding slightly from the broad head portion (24) of the valve pin (21). The valve member sealing face does not, as has been conventional practice, extend radially inwardly past the head portion (24) in the direction of the central bore (13) to avoid being drawn into the bore (13).

Abstract: A hydraulic pressure actuating system has a master cylinder pivotally mounted to the dash panel in line with the actuator pedal, a remotely mounted hydraulic fluid reservoir assembly positioned at the high point of the system for self-bleeding, and an actuating device actuated by pressurized fluid generated by actuation of the master cylinder. The reservoir assembly uses a fluid flow valve mechanism to control its connection with the fluid passage means of the system. Several types of reservoirs are disclosed, including a siphon tube arrangement and various flexible bag arrangements. The reservoir volume is contained in minimum space by using a sidesaddle reservoir arrangement. Indicator arrangements are also disclosed which when actuated indicate actuation and release of the master cylinder in one instance and the amount of fluid in a flexible bag reservoir in another instance.

Abstract: A system in which movement of a first member from a first position to a second position is translated through fluid in a fluid chamber to movement of a second member from a first position to a second position, the system having a pressure equalization line in communication with the fluid chamber allowing fluid to flow into the chamber when the second member is at its first position and out of the chamber when the second member nears the first position when returning from its second position towards its first position.

Abstract: A cylinder-piston unit including a central valve having a valve shaft, on which two spring plates with a pre-stressed restoring spring are disposed. One of the spring plates is engaged from behind by a cross-sectional enlargement of the valve shaft which has a valve closing element. The cross-sectional enlargement is formed by a collar of the valve shaft. Another cross-sectional enlargement comprises a sleeve, which is longitudinally displaceably guided on the valve shaft. On the side remote from the restoring spring, the sleeve has an enlarged inner bore, with which the enlarged inner bore complementarily fits over a snap ring that engages the valve shaft. As a result, a form-locking connection is attained between the sleeve and the valve shaft that assumes that a preassembled valve component unit will be held together even if the snap ring breaks.

Abstract: A dual master cylinder (10) for the braking system of a motor vehicle comprising a bore (18), a primary portion and a secondary portion (14), in which the secondary piston (44) of the secondary portion comprises an outer piston (65) slidable in the bore, and a central piston (78), the central piston including a main body (86) slidable in the bore and a secondary body (92) slidable in a piston bore (64) in the outer piston, the piston bore having a shoulder (72) engageable with a first abutment face (98) on the central piston to define a check valve (62), the piston bore providing a fluid passage (96,68) between the high pressure chamber (56) and the low pressure chamber (48) of the secondary portion, the check valve allowing hydraulic fluid to flow through the fluid passage during a rest mode or a release mode of the dual master cylinder, but preventing such flow during an apply mode.

Abstract: A cap for a reservoir of a master cylinder having a disc member with a plurality of perpendicular guides located on a fixed radius from the center of the disc member for aligning a cylindrical body secured thereto. The cylindrical body has an annular flange with a tapered peripheral surface thereon extending from an edge of a shoulder formed adjacent the annular flange. A diaphragm has an annular base connected to an apex section by a first conical leg and a center section connected to the apex section by a second conical leg. The diaphragm has a plurality of ribs that engage the disc member when an annular lip is located on a shoulder of the cylindrical body.

Abstract: A variable-damping-force shock absorber includes a piezoelectric actuator for producing a displacement, a hydraulic pressure chamber filled with a working oil and having a volume variable in response to the displacement produced by said piezoelectric actuator, and a plunger slidably disposed in a sleeve and reciprocally movable in response to a change in the volume of said hydraulic pressure chamber. The sleeve and said plunger define therebetween a gap communicating with said hydraulic pressure chamber. A supply passage for supplying a working oil from an external working oil source into said hydraulic pressure chamber extends through the gap. A leakage of the working oil from the hydraulic pressure chamber through the gap can automatically be compensated for by working oil supplied through the supply passage. Since the working oil leaks from and is supplied into the hydraulic pressure chamber through the gap, the leakage and supply of the working oil are kept in equilibrium.

Abstract: In a master cylinder for use in various braking devices of an automatic vehicle and the like, a cylinder housing is constituted by a body having an opening at one end thereof and by a cap which is coupled with the body to close the opening. A piston is inserted through the cap and is freely slidably arranged inside the cylinder housing and is guided by a piston guide or a sleeve having a path which is in communication with an external fluid path. The master cylinder has a single groove or a plurality of grooves with a micro-sized depth defined in the surface of the piston guide where it engages the cylinder housing between the external fluid path and a pressure chamber defined by the master cylinder and piston. The master cylinder also has a tapered portion provided on the inner surface of the cylinder housing, and another tapered portion is provided on the end of the sleeve.

Abstract: A reservoir diaphragm for a vehicle brake master cylinder fluid reservoir has a passage in communication with the atmosphere defined between the reservoir cover and diaphragm. The diaphragm has a slot receiving a projection from the cover to normally form a seal. The seal prevents pasage of air between the reservoir and the passageway when the reservoir substantially equals the atmospheric pressure. The diaphragm is movable with respect to the projection to open the seal when the pressure in the reservoir is less than the atmosphere thereby allowing air from the atmosphere to enter the reservoir.

Abstract: A reservoir construction for use with a hydraulic clutch actuator for a motor vehicle. The reservoir includes a blow molded bellows portion including a plurality of pleats or convolutions and is arranged to be moved to a stressed expanded condition in response to filling of the system so that the reservoir serves not only as a source of hydraulic fluid for the system but also serves to pressurize the system by virtue of its stressed condition. The reservoir may comprise a two-part assembly including a main body member and a lid closing the upper end of the main body member, in which case the system is filled through the upper end of the main body member, the lid is secured to the upper end of the main body member, and the output member of the associated slave cylinder is retracted to pressurize the system.

Abstract: A dual chamber master cylinder has a center compensating valve for bypass compensation of the secondary pressurizing chamber, eliminating lip seal damage to the secondary piston seal that can occur when a bypass port is provided in the wall of the secondary pressurizing chamber.

Abstract: A method and apparatus for filling a hydraulic control apparatus of the type including a reservoir, a diaphragm positioned in the reservoir, a master cylinder, a slave cylinder, and a conduit interconnecting the master cylinder and the slave cylinder. The apparatus is filled by the use of a filling head which is fitted into the open top of the reservoir and which includes a nozzle portion having an exterior surface enclosing a volume which approximates the volume of the diaphragm so that, following filling of the apparatus, removal of the filling head, and reinsertion of the diaphragm, the apparatus is automatically placed in a totally filled condition.

Abstract: Remote control of a micromanipulator employs laterally inextensible metal bellows, connected by flexible tubing of constant intermal diameter, in both the micromanipulator and the remote controller. Variations in the length of one bellows is communicated to the other bellows by variations in hydraulic volume, as opposed to variations in hydraulic pressure.

Abstract: A suction refill valve for a master brake cylinder which is suitable for use in brake systems having brake slip control. The refill valve has a sealing element, made from an elastic material, which is annular and is acted upon on virtually all sides by the pressure arising in the work chamber of the brake cylinder. In combination with a valve opening embodied as an annular gap, the suction refill valve can open at relatively low force, even when the brake pressure is high.

Abstract: A master brake cylinder including a re-aspiration valve which is disposed as a central valve in pistons of the master brake cylinder. The re-aspiration valve has a porous body, comprising porous metal, which forms a flat valve seat at one end. The sealing body of the re-aspiration valve is raised gently from the valve seat even at high ambient pressure, which makes a re-aspiration valve embodied in this way particularly suitable for use in master brake cylinders of brake systems having slip control. Because the porous body comprises porous metal which differs in length from its wall surface at one end to its axis to form a conical void space. The porous body has an axial flow resistance that decreases from the outside wall inward to its axis.

Abstract: A fastener driving tool for driving remotely located fasteners through preformed openings in a structure. The tool (10) comprises a housing (12) having a pneumatic-hydraulic intensifier (14) mounted thereon and a remotely located second hydraulic cylinder assembly (20) attached to the housing (12) by means of an extension tube (110). Pressurized air is provided to the tool (10) through a cartridge regulator (36) that is controlled by a trigger assembly (41). A pneumatic piston (72), connected to a first hydraulic piston (76) by a piston rod (80), moves from a first position located away from a nose portion (66) to a second position located toward a nose portion (66). The pressurizing valve (56) admits air to the pneumatic piston (72) to cause the first hydraulic piston (76) to move to the second position, thereby pressurizing hydraulic fluid (92) and causing the second hydraulic piston (102) to extend from the second cylinder housing (104).

Abstract: A stroke variable device comprising a large diameter cylinder and a small diameter cylinder which are interconnected to each other. A large diameter piston and a small diameter piston are slidably inserted into the large diameter cylinder and the small diameter cylinder, respectively, and a cylinder chamber is formed between the inner end of the large diameter piston and the inner end of the small diameter piston. A first seal member is arranged to surround the projecting outer end of the large diameter piston, and a second seal member is arranged to surround the projecting outer end of the small diameter piston. One end of the first seal member is fixed to the projecting outer end of the large diameter piston, and the other end thereof is fixed to the housing of the device to form a first hermetically sealed chamber therein.

Abstract: A hydraulic actuator assembly of the type including a hydraulic system comprising a master cylinder, a slave cylinder, and a conduit interconnecting the master and slave cylinder. One-way valve means are provided, either mounted on the master cylinder or interposed in the conduit interconnecting the master and slave cylinders, and these valve means function to block communication between the system and the associated reservoir when the system if pressurized but allow flow of replenishing fluid from the reservoir into the system when the system is depressurized to compensate for system losses and wear in the associated vehicular mechanism. The valve further includes a manual override member in the form of a plunger which is manually depressed and which moves a valving member of the valve to a position in which it establishes communication between the reservoir port and the system port so that fluid may be moved from the system and into the reservoir even when the system is pressurized.

Abstract: A hydraulic system which includes an auxiliary reservoir having an elastic fluid impervious chamber and apparatus for sealing the elastic fluid impervious chamber with the interior thereof in fluid communication with the inside of an associated fluid reservoir. Apparatus is provided for preventing excessive positive or negative pressure from building in the reservoir. Some embodiments may include a desiccant to dry the air which is within the reservoir above the liquid hydraulic fluid. A moisture indicator may also be used to visually verify that a tight vapor barrier is maintained. The extended surface area of the auxiliary reservoir also acts as a means of rejecting excess heat generated by the operating hydraulic system.

Abstract: An inlet assembly for a brake master cylinder includes an inlet member made of synthetic resin installed in the cylinder body of the master cylinder which has at least two inlet portions and one outlet portion positioned between the inlet portions at the same side. The master cylinder is connected through the inlet portion to a hose communicating with a reservoir installed in a vehicle body. The inlet member includes a first member integrally formed of a first tubular portion on a cylinder body side of the inlet member which is fitted into an inlet portion of cylinder body, a second tubular portion for operative engagement with the hose, and a second member having a mounting portion for mounting on the cylinder body by apparatus for positioning the inlet member on the cylinder body and an opening portion which is fitted by a boss portion surrounding the outlet portion of cylinder body.

Abstract: In a brake fluid container for hydraulic motor vehicle brake systems having a housing with a fill connector a container cap closing off the fill connector, a filling filter suspended in the fill connector and protruding into the housing interior, and a level switch secured to the container cap for indicating a minimum allowable fill level in the housing in order to attain extensive damping of a float of the level switch with respect to fluid fluctuations caused by vehicle behavior, the filling filter is embodied as a closed float chamber, extending to below the minimum allowable fill level in the housing with guides for the float. On its lower end, the filling filter is provided with a throttle bore located near the minimum allowable fill level and in a region near the maximum fill level, it is provided with filter windows for the sake of rapid filling of the housing with fluid.

Abstract: A hydraulic multiple-circuit brake system is proposed, the brake amplifier of which has a multiple-chambered refill container. With an intake connection of its pump, an energy supply apparatus comprising a pump and a reservoir is connected at a predetermined fill level (h/2) to the refill chamber which is intended for the supply of an open brake circuit (II). In this manner, it is attained that if there is an energy failure, the open brake circuit will be capable, as a closed brake circuit, of continuing to function.

Abstract: In order to accommodate all of the tolerances along the bore centerline plane of the reservoir mount for a master cylinder, the reservoir bayonets or projections extending into the boss bores of the master cylinder body are at a reduced diameter established by worst case tolerancing. This results in greater side-to-side clearance perpendicular to the bore center-line than is desired in many instances, giving a relatively loose reservoir fit. To reduce this side-to-side clearance, locally raised ribs or the like are added to the reservoir mount bayonets to better match the diameter in the machined body reservoir bosses provided by the boss reservoir mounting surfaces. The clearance is reduced by locally increasing the diameter of the reservoir bayonet mounts based on worst case tolerancing considering only one reservoir mounting member and its associated mounting boss independently of the other mounting member and its associated mounting boss.

Abstract: A master cylinder employed in connection with a fluid actuated motor vehicle clutch system. The master cylinder includes an internal reservoir formed by a portion of the same cylindrical housing which makes up the clutch actuating working chamber. A plug is provided within the cylindrical housing to divide the housing into two sections, a working chamber and a reservoir chamber. The plug further includes a check valve system which permits fluid to flow into and out of the working chamber from the reservoir as the fluid capacity of the associated hydraulic circuit changes. Flow into and out of the reservoir is permitted to occur only when an externally applied load to the master cylinder is released. The reservoir chamber includes a slidable piston and a low spring constant helical spring which biases the reservoir plunger to provide a slight hydrostatic pressure for the fluid contained by the reservoir, thereby preventing the ingestion of air or contaminants.

Abstract: A master cylinder reservoir for use in a tractor hydraulic braking system has a pair of separate compartments, each adapted for connection to a respective one of a plurality of pressure cylinders. The compartments are interconnected by a flexible connector such as a convoluted tube, and the reservoir is advantageously made in a single piece by blow molding enabling the relative positions of the cylinders to vary so that the reservoir can be readily mounted by spigots engaging bores in the cylinders. The reservoir also has a flanged rigid tubular connection component molded into it during the reservoir molding operation, the material of the reservoir closely surrounding opposed surfaces of a flange of the component to resist longitudinal withdrawal of the component.

Abstract: A supply tank for supplying fluid to a tandem master brake cylinder of a motor vehicle. The tank has a bottom section and a top section which is not shown. The bottom section comprises a partition wall which separates the two chambers from each other, the partition wall being formed with a passage which is arranged approximately in the center of the bottom section. In each chamber, an outlet is configured at each end of the bottom section. From each outlet and along the partition wall toward the middle of the bottom section, there extends one pipe which has an opening respective at its free end. The openings are positioned below the minimum admissible fluid level. The purpose achieved by the configuration of the pipes within the supply tank is that the effect of an inclination of the supply tank does not impair the efficiency of the hydraulic fluid and that, consequently, the outlets are supplied with hydraulic fluid at all times and in any condition.

Abstract: A master cylinder reservoir includes a cylindrical body having an open upper end. A cap is fitted on and removably secured to the body, the cap engaging the open end of the body at a lower end portion thereof. The cap has a mounting portion formed adjacent to the lower end portion thereof. The mounting portion defines together with the upper surface of the open end of the body a circumferential space. The mounting portion has a first surface disposed in opposed spaced relation to the upper surface of the open end of the body. The mounting portion has a second surface disposed in opposed relation to the outer surface of the upper end of the body. The outer surface of the upper end is spaced from the second surface adjacent to the upper surface of the body to form a circumferential recess. A diaphragm received in the cap and having a peripheral portion received in the circumferential space and held between the first surface of the mounting portion and the upper surface of the open end of the body.

Abstract: A tandem master cylinder for an automobile disclosed herein includes a cylinder body having a cylinder bore, a first and a second pistons slidable in the cylinder bore and axially apart from each other, a first and a second power chambers defined, independently from each other, in the cylinder bore by the first and second pistons, and an auxiliary reservoir formed integrally with the cylinder body at its upper side adjacent the first power chamber. The auxiliary reservoir has a first and second reservoir chambers separated from each other by a partition and both connected with a main reservoir. The first power chamber is connected with the first reservoir chamber through a pair of first vent and supply ports. The second power chamber is connected with the second reservoir chamber through an oil passage which is formed in the cylinder body and which uprises in the direction from the latter to the former.

Abstract: A reservoir (20) for a master cylinder (16) has a body (22) with an end member (82) attached thereto by tangs (92, 92' . . . 92.sup.N) that engage a surface (69) on a flange (70). A shoulder (86) concentric to peripheral lip (84) on the end member (82) retains a seal (96). A projection (90) that extends from the end member (82) acts as a stop to assure that a pin (52) on a lever (54) that carries a magnet (60) remains attached to arms (44) extending from the body (22). While motion may move the fluid in compartments (34 and 36) toward flange 70, shoulder (86) acts a first barrier and seal (96) acts as a second barrier to prevent fluid from leaking through the mechanically formed joint. If fluid is lost from the compartments (34 and 36) a float (58) tracks the fluid level and moves magnet (60) toward sensor (64) to inform an operator of the change in fluid level.

Abstract: A tandem master cylinder for an automobile disclosed herein includes a cylinder body having a cylinder bore, a first and a second pistons slidable in the cylinder bore and axially apart from each other, a first and a second power chambers defined, independently from each other, in the cylinder bore by the first and second pistons, and an auxiliary reservoir formed integrally with the cylinder body at its upper side adjacent the first power chamber. The auxiliary reservoir has a first and second reservoir chambers separated from each other by a partition and both connected with a main reservoir. The first power chamber is connected with the first reservoir chamber through a pair of first vent and supply ports. The second power chamber is connected with the second reservoir chamber through an oil passage which is formed in the cylinder body and which uprises in the direction from the latter to the former.

Abstract: A hydraulic control apparatus, more particularly for operating a motor vehicle clutch release mechanism, comprising a master cylinder, a slave cylinder and a conduit connecting the master cylinder to the slave cylinder. The apparatus is in the form of separate modular units which are separately, but simultaneously, filled with hydraulic fluid after simultaneous evacuation of atmospheric air from the apparatus modular units and test of the integrity of the modular units, and the pre-tested and prefilled modular units are shipped unconnected to a user.

Abstract: A hydraulic control apparatus, more particularly for operating a motor vehicle clutch release mechanism, comprising a master cylinder, a slave cylinder and a conduit connecting the master cylinder to the slave cylinder. A leakproof quick-connect connector is placed between the master cylinder and the slave cylinder, preferably at the end of the conduit where it connects to the master cylinder or the slave cylinder, one member of the connector forming part of the master cylinder or slave cylinder. The apparatus, after assembly, is filled with hydraulic fluid, the two members of the connector being held momentarily engaged. After filling, the connector is broken, and the filled components are shipped to a user. After installation of the apparatus for operation of a mechanism such as a clutch release mechanism, the two connector members are reconnected, and the connector members having been provided with a one-way locking member can no longer be separated such as to preserve the integrity of the system.