Abstract: A sealing assembly for installation on a port of a spring brake actuator includes a plug, a one-way valve and a cap. The plug receives the one-way valve for providing one-way air flow through the orifices and maintaining about two psi in the spring brake chamber at zero stroke. An elastomeric piece is affixed to a first set of segments of the plug for sealing against an inner surface of the port. The cap has arms sized to extend around a third set of segments of the plug and snap onto the plug. A fourth set of segments of the plug elastically deform so the sealing assembly can be installed and removed from the port easily.

Abstract: A pressure-medium unit includes a housing, which is produced by injection molding and composed of plastic, in the housing wall of which housing at least one connection bush having a passage opening is fastened, through which pressure medium is fed into and/or led out of the interior of the housing. In the injection molding process of the housing, the connection bush, with the exception of the passage opening, is at least partially injection-molded into the housing wall.

Abstract: A pressure wave generator (40) for driving one or more cryogenic refrigerator systems. The pressure wave generator (40) comprises a housing with one or more inlet/outlet ports (57,58) through which generated pressure waves of gas may pass through to drive a cryogenic refrigerator system or systems connected to the inlet/outlet ports (57,58). The pressure waves are generated by at least one pair of opposed diaphragms (41,42) located in the housing that are moveable in a reciprocating motion within the housing to create pressure waves in gas spaces (55,56) associated with each diaphragm (41,42). The gas spaces (55,56) each having associated inlet/outlet ports (57,58) through which the pressure waves may pass. An operable drive system is also provided to move the pair of diaphragms (41,42) in a reciprocating motion.

Abstract: A pressure driven apparatus comprising a housing, at least one flexible membrane located within the housing dividing the interior of the housing into at least two chambers. At least one input or exhaust cam assembly operates in conjunction with the at least one flexible membrane to provide an expansion zone within the housing. Fluid enters the housing producing movement of the flexible membrane. The flexible membrane is connected to a drive member such that the movement of the fluid within the expansion zone results in the membrane imparting a force to the drive member. The flexible membrane includes seals used to maintain a dynamic and movable seal with respect to the housing.

Abstract: A chamber having an internal volume, end surfaces and a side wall. The chamber is adapted to change its volume by leakage-free displacement of the end surface. The side wall has at least three adjacent sleeves (1-6), and an elastic seal (8-14) is arranged between each of the sleeves, such that the seals are pressurized and expanded when the sleeves are moved due to a displacement of the end surfaces.

Abstract: A pressure wave generator (40) for driving one or more cryogenic refrigerator systems. The pressure wave generator (40) comprises a housing with one or more inlet/outlet ports (57,58) through which generated pressure waves of gas may pass through to drive a cryogenic refrigerator system or systems connected to the inlet/outlet ports (57,58). The pressure waves are generated by at least on pair of opposed diaphragms (41,42) located in the housing that are moveable in a reciprocating motion within the housing to create pressure waves in gas spaces (55,56) associated with each diaphragm (41,42). The gas spaces (55,56) each having associated inlet/outlet ports (57,58) through which the pressure waves may pass. An operable drive system is also provided to move the pair of diaphragms (41,42) in a reciprocating motion.

Abstract: A reciprocating body 12 is reciprocably housed in a cylinder body 6, and a pressure rod 20 is reciprocably attached to this reciprocating body 12. A pressure end 20a of the pressure rod 20 protrudes from the cylinder body 12 toward the outside. By the reciprocating body 12 and diaphragms 17 to 19, an advance pressure chamber 27 and a weight offset pressure chamber 29 are partitioned and formed in the cylinder body 6. After the pressure end 20a is disposed vertically downwardly, the weight offset pressure chamber 29 is filled with compressed fluid, whereby self weight of the reciprocating body 12 and the pressure rod 20 is offset. Then, the compressed fluid is supplied to the advance pressure chamber 27, and an object to be pressurized W is pressurized through the pressure rod 20.

Abstract: The dual actuator valve of the present invention deploys both the primary and secondary actuator elements in a single, common control chamber. Therefore, the present invention provides a dual actuator valve having dimensions that are the same as, or similar to, the dimensions of a single actuator control valve. It will be appreciated that the actuator elements may be of diaphragm type or piston type actuator elements. The primary actuator element is mechanically linked to the valve plug and regulates the flow though the valve, while the secondary actuator element remains in a fully open position. Should the primary actuator element fail to operate the valve due, for example, to diaphragm rupture, failure of the primary control system, or any other reason, the secondary control system activates the secondary actuator element, which then effects movement of the primary actuator element thereby resuming flow regulation or closure of the valve as necessary.

Abstract: A spring-actuated air-brake cylinder as the diaphragm cylinder for vehicle brake systems includes a diaphragm, an actuator-spring chamber in which there is received a spring-actuated piston, which is acted on by a compression spring as the actuator spring and is actively connected to the diaphragm, which is disposed between the actuator-spring chamber and a pressure chamber, in which there is guided moveably a sealed push rod, which can include a pressure member on its diaphragm side. The spring-actuated diaphragm is connected to the push rod or to the pressure member or to the spring-actuated piston by means of vulcanization.

Abstract: A diaphragm pump comprises a two part casing formed of a front cover (10) and a back cover (12). A diaphragm plate (14) extends across the covers (10,12) and is secured therebetween when the covers (10,12) are fastened together. The diaphragm plate (14) has a plurality of similarly defined circular regions (16). The front cover (10) has substantially axially aligned inlet and outlet ports (18), each leading to mutually exclusive inlet and outlet chambers (22,24) respectively. A valve housing (26) is securable inside the front cover (10) and has defined therein an outlet dished valve seat (28) with a correspondingly concave resilient valve (30) seated therein. The outlet valve seat (28) has fluid passages therethrough. A plurality of inlet valve seats (34) is provided, equal in number to the number of regions, each being similarly dished and having a correspondingly concave resilient valve (36) seated therein. Each inlet valve seat (34) has fluid passages therethrough.

Abstract: A robot system includes a plurality of segments 3, joints 4 for linking the segments together, drive units 5 for actuating the joints, and a controller 8 for controlling the drive units. Further, the robot system has bladders 2 filled with a fluid being of lower specific gravity than the outside environment. A center of buoyancy differs from a center of gravity, and the robot system has a specific gravity of greater than 1 relative to the outside environment.

Abstract: A tandem vacuum booster includes an internal air passage connection between primary and secondary high pressure chambers of the booster, and extending through a primary low pressure chamber of the booster. The internal air passage connection includes a tubular collar extending longitudinally from a divider separating the secondary high pressure and primary low pressure chambers, and an extensible air tube extending through and from a primary diaphragm of the booster, with the primary diaphragm defining the boundary between the primary high and low pressure chambers. The collar includes an outer surface thereof adapted for receiving a distal end of the extensible air tube extending over a portion of the outer surface of the collar. The distal ends of the collar and the air tube include elements for retaining and/or sealing the distal end of the extensible tube against the outer surface of the collar.

Abstract: A spring brake actuator having a flange case and a head is provided. The flange case and the head each have a radially outwardly extending annular flange having a plurality of radially spaced apart axial holes passing therethrough which correspond to and align with each other. A diaphragm is clamped in a fluid tight manner between the annular flange of the head and the annular flange of the flange case. A plurality of disassembleable fastening members pass through the holes in the annular flange of the head and the holes in the annular flange of the flange case in order to undetachably secure the head on the flange case.

Abstract: An improved brake actuator, particularly an improved sealed service chamber, having a flexible tubular seal affixed at one end in the central pushrod opening in sealed relation and surrounding the pushrod in sealed relation in the service chamber housing. The improved seal is generally hourglass-shaped including a midportion which closely circumscribes the pushrod in sealed relation and a free end portion which closely circumscribes the pushrod. A relatively inflexible generally diamond-shaped washer surrounds the midportion of the seal which improves sealing, assures concentricity of the tubular seal, prevents the seal from being pushed through the pushrod opening and provides for easy assembly of the seal and washer assembly in the service chamber around the pushrod. The improved end wall of the service chamber housing includes an offset recessed central portion surrounding the mounting bolts and relatively thin preferably V-shaped contact surfaces which generally circumscribe the recessed portion.

Abstract: A system for deforming or actuating an elastomeric structure is described. he system includes a plurality of tubes joined to the elastomeric structure. The tubes extend in the direction of a desired strain to be applied to the elastomeric structure and are constrained from circumferential expansion. When a pressurized fluid is applied to the tubes, the tubes deform causing a like deformation of the elastomeric structure.

Abstract: A pneumatic brake booster having a right casing (10) divided in a leaktight fashion by a first moving partition (12) into a front chamber (14) and a rear chamber (16). The front chamber (14) being permanently connected to a source of low pressure (V) with the rear chamber (16) being selectively connected to the front chamber (12) and as source of high pressure by a three-way valve (40) operated by an operating rod (34). A three-way and two position solenoid valve (68) has a first inlet connected to the source of low pressure (V), a second inlet connected to a source of high pressure (A) and outlet connected to the rear chamber (14). A second moving partition (54,54') divides the rear chamber (14) into a working chamber (16) and a control chamber (50,50') with the outlet of the solenoid valve (68) being connected to the control chamber (50,50').

Abstract: A fluid-operated combination diaphragm spring brake has a tamper-resistant connection between a head and a flange case which together form a spring chamber housing a power spring. The head has an annular flange and an axial rim, and the flange case has an annular flange and an axial rim, The flanges of the head and the flange case and at least one of the rims of the head and the flange case define an annular recess. A diaphragm is sandwiched between the flanges and substantially fills the annular recess, removing substantially all the air within the annular recess. A welded connection radially adjacent the diaphragm secures head rim to the flange case rim.

Abstract: Pneumatic jack of the type comprising a rigid body (1) joined to the outer edge of a deformable membrane (2) so as to delimit with the latter a chamber of variable volume capable of being subjected to either atmospheric pressure of a negative pressure, via an air inlet located in the chamber. The body (1) and the membrane (2) each have, substantially in the center, an opening (15, 14) that can be closed, at least partially, by a disc (4, 3). Application in multiple position jacks.

Abstract: The invention is an assembly of a plurality of relatively movable jointed mbers such as robotic arm segments and a mechanical muscle connected between two of the segments. The muscle has a longitudinally inflexible, radially expandable sleeve containing a pressurizable bladder of elastic material. The bladder enlarges diametrically when pressurized and bulges the wall of the sleeve outward. The sleeve thereupon contracts axially to compensate for taken up by the sleeve's outward bulge. A terminus at either end of the sleeve connects the sleeve to different segments of a jointed arm, so that the sleeve's axial contraction effects movement of one segment relative to the other.

Abstract: An air-operated diaphragm spring brake (10) is provided with a mounting means (16) which permits adjustment of the position of the pneumatic ports (30, 32) on the brake with respect to the vehicle. The mounting means (16) comprises a plate (84) mounted to an end section (88) of a housing (82) overlying a central aperture (90). A pair of threaded mounting studs (96) are fixedly secured to the plate (84) for mounting the plate to the vehicle.

Abstract: The present invention teaches a brake cylinder which is formed by a cylindrical housing and a cylinder base. The cylindrical housing and cylinder base are joined together by a bayonet connection and form a pressure chamber. The bayonet connection is designed pressure-tight, and it is located on the pressurized-side of a circular sealing element which seals off the cylinder base from the cylinder housing. The bayonet connection is thereby protected from the entry of detrimental environmental influences, especially dirt and moisture, and it can still be easily disassembled at all times.

Abstract: An air-operated spring brake of the type wherein a spring-operated brake actuator is in tandem with an air-operated service brake actuator has a spring diaphragm which separates a spring housing into a fluid pressure chamber and a spring chamber. A spring in the spring chamber bears against a pressure plate to bias the diaphragm longitudinally in the spring housing in a brake-applying direction upon a decrease in pressure in the fluid pressure chamber. The diaphragm is movable generally longitudinally in the other direction to compress the spring in the presence of pressure in the fluid chamber to allow operation of the service brake actuator independently of the spring-operated actuator. A push plate, mounted to a push member, moves reciprocally with the diaphragm in the fluid pressure chamber in abutting relationship to the spring diaphragm.

Abstract: A device for converting energy of a fluid medium into mechanical work comprises a hermetically sealed chamber (1) communicated through valves with systems for supply and discharge of a fluid medium. The chamber has an opening (4) in which a sleeve (5) of flexible material is secured through one end along the perimeter, the sleeve being mounted in the chamber (1) with a possibility of reciprocation relative to the secured end so that during the motion from the initial position to the extreme position a part of the sleeve (5) is turned inside out forming a space (9) communicating with the chamber (1). The sleeve (5) through its other end is connected to a drum (7) disposed in the chamber (1) and mounted on a shaft (6) coupled to a reverser (11) through an overrunning clutch (8). In the initial position the sleeve (5) is wound on the drum (7).

Abstract: A pressostat comprises an operating pressure chamber (4) which is limited by its housing (1) and by an operating membrane (5) or the like including a pressure surface for an output adjustment member (3), at least one spring counteracting the pressure (P) in the operating pressure chamber (4), a switch member (2) which responds when a limit pressure value is exceeded in said working pressure chamber (4), and an enclosed protective chamber (6) arranged concentrically to the working pressure chamber (4) limited by the housing (1), the operating membrane (5) and a protective membrane (7) or the like including pressure surface for the output adjustment member (3).

Abstract: Disclosed is a spring brake cylinder for use on motor vehicles. The cylinder is actuated to a release position in response to fluid pressure. The cylinder includes a spring actuator inserted between the brake cylinder base and a spring brake piston. A tensioning device is provided which mechanically acts upon the spring brake piston and facilitates adjustment of the distance between the spring brake piston and the cylinder base. The spring brake piston and the spring actuator can be assembled into a pretensioned unit outside the spring brake cylinder.

Abstract: A vacuum control device comprises a casing in which are disposed at least two substantially parallel movable cups, the first cup being connected to the element to be displaced. Springs are interposed respectively between the two cups and between the second cup and a bottom end-wall of the casing. Two pipes or nipples connected to a vacuum source and to atmospheric pressure open into the casing respectively within the space located between the two cups and within the space located between the second cup and the casing end-wall.

Abstract: A housing (10, 12, 14) has first and second flexible membranes (32, 42) dividing it into two sealed chambers plus a third chamber from which the movable member (38) projects. Each membrane co-operates with a respective cup (40, 50) and return springs (54, 56) tend to urge both cups away from an end wall (26). The two cups are interconnected by a single piece member (58) which is inextensible but which can readily be bent in two to enable the cups to come into contact with one another. Each sealed chamber can individually be selectively connected to a source of reduced pressure via a respective orifice or pipe fitting (30, 28). The position of the movable member (38) can thus be changed.

Abstract: Control device for a braking corrector (10) capable of being imposed between a source of hydraulic pressure and a motor vehicle braking circuit, of the type incorporating a casing (12) provided with at least one bore (14, 14') a plain or differential hydraulic piston (16, 16') sliding in the bore (14, 14') and defining in it a first pressure chamber (18, 18') and a second pressure chamber (22, 22') which are capable of being joined to the source of pressure and to the braking circuit, respectively, the piston (16, 16') controlling the flow of a fluid under pressure between the chambers, the control device incorporating a pilot piston (48) for fluid capable of generating a pilot force (Fp) upon the hydraulic piston (16, 16') so as to push the latter toward the inside of the casing (12) in the direction in which the flow of fluid is established, the fluid under pressure generating a reaction force (Fr) pushing the piston (16, 16') toward the outside of the casing (12) in the direction in which the flow of fluid

Abstract: A vacuum control device comprises a casing in which are disposed at least two substantially parallel movable cups, the first cup being connected to the element to be displaced. Springs are interposed respectively between the two cups and between the second cup and a bottom end-wall of the casing. Two pipes or nipples connected to a vacuum source and to atmospheric pressure open into the casing respectively within the space located between the two cups and within the space located between the second cup and the casing end-wall.

Abstract: A crossed-bellows controller which includes four bellows arranged in cruciform. The bellows are surrounded by a movable baffle ring which serves as a baffle plate for a nozzle. A frame-shaped cage is provided within the baffle ring, with the cage being connected through one pair of bellows with a central member. The baffle ring is connected with the cage through the other pair of bellows.

Abstract: An infinitely variable, double-acting positioning linear actuator which responds proportionally to fluid pressure includes a hollow cylindrical housing and an actuating rod axially movable through the housing. Two partitions cooperate with the actuating rod for movement therewith and define within the housing a spring chamber and first and second actuating chambers which are at opposite ends of the spring chamber. A compression spring is mounted within the spring chamber and each actuating chamber has a fluid port to communicate with pressurized fluid. First and second retaining structures within the spring chamber cooperate with respective ends of the spring and each have a respective stop. The spring chamber has a limiting structure which cooperates with the stops to hold the stops spaced apart at a particular spacing when the actuator is centered.

Abstract: An apparatus that controls movement of an arm through a gaseous or liquid fluid. The apparatus incorporates a plurality of longitudinally extensible hose members that expand and contract their respective lengths responsive to introduction and withdrawal, respectively, of hydraulic fluid thereinto and therefrom. The hose members are interconnected to one another through a plurality of longitudinally spaced, transversely disposed brace members that may serve as lever means so that expansion or contraction of one hose member can effect an opposite response in an opposed member. The brace members may be interconnected by a spine means that coincides with the longitudinal axis of symmetry of the apparatus. A sheath covers the apparatus. The arm has applications in the field of robotics and a special rat tail-like form of the apparatus provides a low drag substitute for conventional aircraft rudder and elevator assemblies.

Abstract: A tandem brake booster (10) having first (24) and second (28) walls that move in opposite directions within a cavity to produce an output force. A lever arrangement (48) attached to the second (28) wall engages a fulcrum (70) to transfer a force produced by movement of the second wall (28) into the first (24) wall. A control mechanism (72) has a cylindrical body (74) with an annular surface (78) that engages the lever arrangement (48). The movement of the cylindrical body (74) as compared to the output member (41) is a function of the ratio of the distance from the fulcrum (70) to end (46) and from the fulcrum (70) to the annular surface (78), and as such, maximum output travel can be achieved without requiring a corresponding input travel.

Abstract: A fluid pressure servo motor comprises a body having two operatively independent fluid chambers each chamber having therein a piston means movable in response to a fluid pressure differential so as to alter in use a two condition device from one to the other of said two conditions. The two piston means each have a lost motion means connection with the device to allow idle return of the pistons on cessation of the pressure differential. The two chambers and their respective pistons are co-axial and the pistons work in opposition to each other, one piston being fixed to a stirrup which bridges the other piston and acts in use against the two condition device, while allowing said other piston to move independently of the stirrup. Also disclosed is a vehicle door locking system incorporating servo motors as described.

Abstract: An engine is provided which converts pressurized gas into useful mechanical energy. The engine uses pressurized gas in such a way to avoid contact between the gas and sliding metal parts. As such, the engine is particularly adapted for use with naturally pressurized geothermal gases which may contain substances harmful to metal. In the preferred form, the engine includes a plurality of reciprocating plungers which serve as energy transfer means. Deformable enclosures such as spheroidal hollow balls made of an elastomer material are positioned on opposite sides of each plunger along its axis of movement. The deformable enclosures exert a force against the plungers to move the plungers when filled with pressurized gas. Each plunger alternately collapses each of the deformable enclosures as it reciprocates. A valve system for controlling the ingress and egress of pressurized gas to the deformable enclosures is responsive to the motion of the plungers.

Abstract: This invention relates to fluid pressure servo motors having two operatively independent fluid chambers, each chamber having a piston means therein movable in response to a fluid pressure differential so as to alter in use a two position device from one to the other of said two positions, each piston means having a lost motion means connection to allow the idle return of the piston in the event of cessation of the fluid pressure differential, wherein the two pistons are co-axial and move in opposite directions in response to the pressure differential and one piston is fixed to a stirrup formed as a wire loop which bridges the other piston to act in use against said device.

Abstract: An improved spring guide incorporating a collapsible telescoping sleeve assembly is used in conjunction with a conventional fluid pressure operated brake of the type having a safety brake mechanism which employs a spring powered brake actuator for automatic activation of the safety brake in case of an emergency or a pneumatic failure.

Abstract: A two stage vacuum break or fluid motor device of the type used to control choke valves of internal combustion engine carburators. The motor uses a single diaphragm in which the fluid motor plunger operates in a first stage in response to movement of a portion of the diaphragm and in a second stage in response to movement of the entire diaphragm. The stages of movement are under the control of separate sources of manifold pressure which may be made available to the device independently of each other. The two stages of operation may be used to control one or more choke valves through a single output plunger or to control a pair of output plungers movable independently of each other.

Abstract: Brake actuators are provided which use pistons for both auxiliary and service functions, the auxiliary piston being operative to compress a spring in response to fluid source pressure and the service piston being operative to develop throughout its movement a brake operating force which is uniformly proportionate to service fluid pressure. Two cup-shaped housing members have rim portions secured together. One of such cup-shaped members and a metal sleeve define cylindrical surfaces for co-action with the pistons, the metal sleeve being disposed within a resilient sleeve which is disposed at least partly within the other of the cup-shaped members. The service piston is located in front of the auxiliary piston and coacts with the cylindrical surface of the metal sleeve. A resilient boot is disposed between the service piston and a forward end wall, around an actuating rod having a rearward end in engagement with the service piston.

Abstract: Brake apparatus for a railway vehicle including a brake cylinder device of the type having a pair of interconnected pistons to which the vehicle brake rigging is connected, the larger piston having a pair of chambers formed on opposite sides in which air is stored, and a control valve device that is operative responsive to a reduction of brake pipe pressure to connect pressure from the one side of the larger piston to a corresponding side of the smaller piston to effect movement of these pistons to a brake application position and concurrently vents pressure in the chamber on the other side of the larger piston. A transfer valve device is provided to interrupt this exhaust of pressure from the chamber on the other side of the piston until the piston has moved to application position so that the chamber volume is minimal and thus renders a minimum amount of air exhaust sufficient to produce brake applying pressure differentials across this larger piston.

Abstract: An adjusting drive operated by a pressure medium with a spring-loaded roller diaphragm secured to plates and displaceable within a housing by the pressure medium; the roller diaphragm actuates an adjusting member that is securely connected with a plate and extends out of the housing; in addition to its end positions, the adjusting member is also able to assume at least one intermediate position; the plates are thereby connected with each other by the roller diaphragm while a plate not directly connected with the adjusting member sealingly rests on a ring-shaped abutment projecting out of the inner wall of the housing in the intermediate position of the adjusting member.

Abstract: A low pressure air displacement pump including one or more cylinders or bellows powered by rotary or reciprocating motivation means. This device employs two or more bellows radially disposed and activated by a singular rotary source of power which imparts a cranking motion to connecting rods affixed to the bellows, which, in turn supply individual conduits with equal or varying amounts of displaced air, in accordance with the particular sizes of the individual bellows.

Abstract: Apparatus for controlling the ignition timing of an internal combustion engine provided with an exhaust gas recirculation system. A vacuum advancer has a diaphragm mechanism to control the vacuum ignition timing in response to negative pressure in the carbureter when a part of the exhaust gas is recirculated from the exhaust manifold to the intake manifold. A vacuum transmitting valve restricts the transmission of negative pressure in the carbureter to the vacuum advancer, whereby vacuum ignition timing advance of the engine during acceleration is delayed.

Abstract: The invention relates to a spring brake assembly of the compressed air type for truck tractor types of vehicles. The brake actuators of the assembly each includes a heavy coil type emergency spring which is held in a compressed state on the back side of a diaphragm by compressed air applied to the front side of the diaphragm during operation of the vehicle. The emergency spring expands to actuate a brake setting push rod when the compressed air is vented from the front side of the diaphragm and this occurs when the vehicle engine is turned off or when there is an accidental loss of compressed air from the brake unit. The emergency spring is housed in a chamber and, due to the movement of the diaphragm, atmospheric air is continually being drawn into and expelled from that chamber. As the brake actuators are mounted on the rear axle of the vehicle, they are in low positions relative to the roadway and the air drawn into the emergency spring chambers thereof is laddened with salt and water.

Abstract: This invention relates to a novel railway vehicle brake apparatus that comprises a brake cylinder device having two tandem-connected pistons of unequal size, the larger of which is provided with a check valve and cooperates with a hollow cylindrical body in which it is slidably disposed to form on its respective opposite sides two fluid pressure storage reservoirs wherein is stored fluid under pressure for effecting a brake application. This brake apparatus further comprises a novel brake control valve device that is so responsive to a reduction of pressure in a train brake pipe as to first cause simultaneous shifting of both pistons in a brake-applying direction and a transfer of fluid under pressure from one side of the larger piston to the other until a chosen braking force is transmitted through brake rigging to press brake shoes against the wheels of a vehicle.

Abstract: A fluid brake actuating mechanism is described which includes a service brake chamber and a spring actuated auxiliary brake chamber. A device for centering the spring in the auxiliary brake chamber, not only under static conditions, but also under dynamic conditions by guiding the auxiliary piston plate during movement thereof is disclosed. The adaptation of the centering device for brake actuating mechanisms of different structures is described.

Abstract: A carburettor for an internal combustion engine includes a chamber into which fuel is introduced from a metering valve to produce a fuel/air mixture in the chamber. A main valve controls the rate of flow of fuel/air mixture from the chamber and a further valve upstream of the main valve is provided the opening of which controls the opening of the metering valve. The further valve opens so as to keep the pressure between the main and further valve constant with changes in flow rate through the chamber. Means are provided to provide an indication of the pressure of fuel/air mixture downstream of the main valve such that the metering valve can be further opened as a function of changes in said pressure downstream of the main valve.

Abstract: A device for displaceably supporting a body in relation to a support surface comprising at least two elastic elements positionable between the support surface and a surface of the body and separately expansible and contractible in a direction towards and from the support surface and the body surface and means for alternately expansing and contracting the elastic elements, the elastic elements thereby being alternately loaded by and unloaded from the weight of the body, the body being displaceable substantially parallel with the support surface by means of elastic shearing in the elastic element at the moment loaded by and supporting the body, and the means for expansing and contracting the elements being adapted to contract and unload the loaded element after a predetermined deformation thereof and to expanse the other element to a loaded position, the unloaded element thereby elastically resuming its non-deformed position.

Abstract: Pressure responsive force transmission apparatus such as may be used in automatic controls and for hydraulic and pneumatic lift or force mechanisms comprises a pair of substantially rigid lift elements each having a base plate, at least two guide arms projecting from the base plate, and at least two guide surfaces at the sides of the base plate. The pair of lift elements is mated together each with its guide arms engaging the guide surfaces of the other. A flexible inflatable bladder is disposed between the base plates of the mated lift elements. One of the lift elements is formed with a fluid transmission passage communicating with the interior of the bladder. By delivering fluid under pressure through said passage, the bladder is inflated and causes the lift elements to move apart.

Abstract: An air brake includes a service brake chamber which actuates a push rod. A collet brake chamber is partially defined by a collet brake diaphragm. A locking collet is mounted to the collet brake diaphragm and includes a bore through which the push rod passes. A collet brake spring biasas the collet into a tapered collet hole to clamp the collet onto the push rod to prevent the movement of the push rod toward the brake off position. Application of pressure to the collet brake chamber overcomes the force of the collet brake spring and moves the collet away from the tapered collet hole to allow the push rod to move freely. The collet can be moved towards and locked against the collet brake spring to prevent the collet from engaging the push rod. This allows the user to effectively deactuate the collet brake feature when desired, such as to mechanically release the push rod from the collet when the vehicle is stationary.