Abstract: A power piston assembly for booster, in particular, an improvement of an axial portion of a power piston and a retainer which is engaged therewith is disclosed. A front power piston is formed with a first and a second tubular section around its inner periphery, and the first tubular section is fitted around a flange of a valve body and is prevented from disengagement therefrom by an annular retainer. Around its outer peripheral edge, the retainer is formed with a peripheral tubular portion, which is disposed as a press fit around the second tubular section of the front power piston from the front side, thereby connecting the front power piston to the flange of the valve body. With this arrangement, the front end of the first tubular section of the front power piston may be located rearward of the front end of the valve body (or its flange). Accordingly, the axial size of the first tubular section and hence of the booster may be reduced as compared with a conventional arrangement.

Abstract: Disclosed is an improved spring brake assembly, and a method for making same, which is particularly resistant to unauthorized disassembly and its consequent hazards. A diaphragm is locked between two opposing portions of a housing. The two opposing portions of the housing are both made of steel and are welded rather than clamped to one another. The weld is performed in such a way that the diaphragm is not burnt or otherwise damaged by the welding process. The opposing portions are configured as a cylindrical coupling between a male member having an inwardly extending lip, and a female member preferably having an inner circumferential ledge, which cooperate to trap the periphery of the diaphragm at an end of the coupling remote from the weld.

Abstract: The present invention provides a tamper-resistant fluid-operated brake actuator having a power spring housed within a head or cap which is attached to a flange case having one or more diaphragms or pistons responsive to changes of fluid pressure within the brake actuator chambers. In one embodiment, the head is attached to the flange case by a substantially continuous curvilinear annular metal retaining member which must be inelastically deformed or destroyed in order to remove the head from the flange case, thus rendering tampering more difficult. In another embodiment, the annular metal retaining member of the present invention is integral with the actuator head and which is metal-spun or the like onto the flange case.

Abstract: A vacuum brake power booster (1) has an electric travel sensor (3) for monitoring the position of a movable wall (4) furnishing the boosting power of the brake power booster. The travel sensor (3) is mounted by a sensor receptacle (2) which is made of plastic material and which is sealed off with respect to the booster housing (10) by means of a seal. In order to assure effective sealing by creating a constant degree of compression of the seal (7) despite different material thicknesses of the booster housing (10), angled tabs (12) are formed against which locking projections (11) are abutted.

Abstract: A vacuum booster has a booster shell formed of a front shell half and a rear shell half interconnected at their open ends opposed to each other, and a diaphragm which divides the shell interior into a vacuum chamber on the front shell half side and a working chamber on the rear shell half side. An outer peripheral bead portion of the diaphragm is clamped between the open ends of both the shell halves with an outer surface of the outer peripheral bead portion being contacted under pressure with an inner surface of the open end of the front shell half. The outer peripheral bead portion is provided at an outer periphery thereof with a first tapered surface tapered toward the front shell half and a second tapered surface tapered toward the rear shell half such that the first and second tapered surfaces are formed into an angled shape in their cross section.

Abstract: In a hydraulically controlled diaphragm pump for high pressures, the diaphragm situated between the hydraulic control chamber and the working chamber is composite and comprises two thin metal diaphragms having between them an intermediate diaphragm that is thick, is made of synthetic material, has high crushing strength, and is in the form of an elastically deformable vault whose concave side faces towards the working chamber.

Abstract: A brake booster provided with a function to serve as an automatic brake is disclosed. Bellows disposed within a shell has a rear bead which is axially held sandwiched between an annular recess formed in the inner periphery of a front power piston and a retainer which is a press fit over the outer periphery of a valve body. When the atmosphere is introduced into an internal space defined within the bellows to operate the brake booster as an automatic brake, the bellows tends to expand, whereby the rear bead becomes pulled axially and radially. However, a displacement of the rear bead is prevented by being held between the annular recess in the front power piston and the retainer, thereby effectively preventing a failure of a hermetic seal in the region where the rear bead is connected.

Abstract: A brake booster is provided having a power piston slidably mounted in a housing. In a preferred embodiment the piston has a generally radial flange. Encircling the power piston is a flexible diaphragm having along its inner periphery a bead encircling the power piston and a sheet-like section radially extending from the bead. A retaining ring has a first section extending radially outward, a second section generally parallel with the piston and a third section with teeth projecting radially inwardly. Pushing the retainer towards the flange causes the bead to be radially compressed and the third section of the retainer to be deformed. The wedging causes the retainer to be retained in place sealably connecting the diaphragm with the power piston.

Abstract: A fabric reinforced molded conical diaphragm and method of making in which the parting line of the diaphragm mold is arranged such that the flashing and reinforcing fabric of the molded diaphragm are on the sidewall of the outer clamping bead at a location displaced from the juncture of the sidewall and the bottom surface thereof, so that upon inverting the diaphragm member, the fabric free bottom surface of the clamping bead is transposed to the sidewall of the diaphragm clamping bead, thereby providing a smooth, accurately sized outer periphery of the diaphragm to facilitate its assembly.

Abstract: The invention relates to a brake subassembly for a vehicle having an engine compartment and a passenger cell separated by a bulkhead (46), the subassembly comprising: a pneumatic boost servomotor controlled by way of a pedal (28) and intended to be fixed to the bulkhead (46), the servomotor comprising, coaxially, a front shell (14), having a cylindrical wall, and a rear cover (16) and having, on the inside, two chambers (18, 20) separated in leaktight fashion by a piston (22) provided with a diaphragm (26) ensuring leaktightness between the two chambers, a master cylinder (10) fixed to the front shell (14) and at least one brake pedal (28).

Abstract: A diaphragm pump with a flat diaphragm which is held between the face surface of a pump head and the corresponding face surface of a hydraulic block is improved in that the annular clamping region has an angling step such that the clamped-in diaphragm is bent in its outer annular border region. In this way, a sealed tightness is achieved over long time periods, as well as inducing a uniform diaphragm tension which effects performance of the pump advantageously. Inventive valve designs are provided which allow removal for cleaning from outside the assembled pump and also allows manual opening of the valves for unclogging. An efficient design is provided for a pump head.

Abstract: A diaphragm pump includes upper and lower pump bodies clamping a diaphragm therebetween which separates a driving fluid chamber in the upper body from a pump chamber in the lower body, each body having gripping ridges surrounding the chamber; a driving fluid reservoir in the upper pump body; an outlet check valve having a seat, a closure member and a spring to urge its closure; drive means for alternately pressure loading and unloading the driving fluid chamber; a diaphragm having a central body portion connected to an annular clamping portion by annular webbing; a protruding annular rib inside of the ridges, and sized to bite into the diaphragm before the ridges when the bodies are clamped together; means for adjusting the size of an opening between the driving fluid reservoir and the driving fluid chamber; means for adjusting the distance that the closure member can move away from the seat; a piston assembly including piston received within a cylinder having an upwardly facing sealing surface and adapted to

Abstract: A method of establishing a spring force for a push rod of a control valve in a brake booster to set the force which opposes an operational input force. After attaching the push rod to a plunger, the plunger is located in the bore of a hub of a movable wall of the brake booster. When the plunger is installed in the bore, a groove located adjacent a threaded end of the push rod extends past the hub. A spring and sleeve are placed on the push rod and a fixture attached to the rear shell of the booster. The push rod and sleeve pass through an opening in the fixture to align the push rod within the axial center of the bore of the hub. A force is applied to the push rod to move the push rod within said bore to establish a rest position of the plunger with respect to a seat on a poppet valve. Thereafter, a force is applied to the sleeve to initially move the sleeve on said push rod to bring the spring into engagement with the hub and thereafter compress the spring until a predetermined spring force is established.

Abstract: A brake booster is disclosed. More specifically, an improvement relating to a reinforcing plate which is used to reinforce a shell to which a master cylinder is connected is disclosed. The reinforcing plate comprises a pair of members, i.e. a first reinforcing plate which is disposed along the inner surface of the shell which provides a mounting surface for a master cylinder, and a second reinforcing plate which is disposed along the inner surface of the shell at a location radially outward of the mounting surface for the master cylinder. The rigidity of the shell can be increased without increasing a sheet thickness thereof.

Abstract: A diaphragm control valve including a casing having an opening in one side, a cylindrical pipe mounted in a coaxial relation to the casing and having a flange forming a valve seat at one end, a flexible diaphragm symmetrically mounted in the casing in a spaced relation to the valve seat, and a cover mounted on one end of the casing forming a pressure chamber on one side of the diaphragm. The chamber is pressurized to move the diaphragm toward the valve seat to control the flow of fluid across the valve seat. A number of ports or slots are provided in the valve seat to relieve pressure buildup on the valve seat.

Abstract: A peripheral sealed interlock for a dual diaphragm tandem vacuum booster with front and rear housings is provided. An outer radial peripheral end of a divider of the inventive interlock is greatly simplified and in the preferred embodiment a bead of a secondary diaphragm is allowed to seal on a rear housing member as well as with the periphery of the divider. The interlock provides a simplified design allowing independent compression of primary and secondary diaphragm beads while at the same time providing an interlock which require lower compression for assembly and sealing.

Abstract: A brake booster includes a center plate disposed within a shell. A seal member is provided to interrupt a communication between a variable and a constant pressure chamber which are located across the center plate. The seal member is formed with a lip, acting as a check valve which releases to the variale pressure chamber any pressure developed in the constant pressure chamber which is to be sealed by the seal member and which rises above the pressure in the variable pressure chamber.

Abstract: The present invention provides a compliant molded diaphragm which includes an operable surface area for forming a flexiblle barrier to prevent fluid flow between opposing sides of the diaphragm. The diaphragm is formed as a sandwich structure having first and second elastomeric layers and a third gas impermeable layer located between the first and second layers. The third layer may be provided as a thin layer of metal which is vapor deposited between the two elastomeric layers or may be a thin gas impermeable polymer film. The impermeable layer is preferably formed as a grid pattern in the operable surface area of the diaphragm such that portions of the first and second layers are exposed to each other whereby the first and second layers may be bonded to each other to prevent separation of the layers of the diaphragm.

Abstract: A brake booster-mounting construction includes a reinforcement plate which is adapted to be fastened, jointly with a shell, to a fixing member by stud bolts extending outwardly from a shell wall. The brake booster-mounting construction is characterized in that; in its non-mounted condition, the reinforcement plate is abutted against an outer peripheral portion of said shell, and also that portion of the reinforcement plate to be jointly fastened by the stud bolts is spaced from the shell; and in its mounted condition, the reinforcement plate spring-urges a brake booster in a direction away from the fixing member.

Abstract: The pneumatic booster of the vacuum type comprises mainly a housing (12) divided into two chambers (7, 8) by a movable wall structure (6), constructed of a substantially radial plate (9) and a flexible diaphragm (10) secured by its outer peripheral edge to the housing (12), and forming a flange (11) in the space between the plate (9) and the housing (12). The plate is centrally integral with a hub structure housing, a distribution valve device and linked to a control member and to a controlled member, each by a swivel connection. The plate (9) has at its outer edge an extension (13) cooperating in a non-leaktight manner with the internal wall of the housing (12) in order to ensure axial guidance of the movable wall (6) inside the housing (12).

Abstract: A pressure vessel (10) has partially telescoped upper and lower shells (12, 14), a diaphragm (20a) with a peripheral edge (26) trapped and sealed between the shells (12, 14), and compression structure (50, 52) on the inner side (44a) of the peripheral edge (26) of the diaphragm (20a) reducing the amount of diaphragm material requiring compression and also increasing the compression of the bulge (42) of the peripheral edge (26) of the diaphragm (20a) in the bulge (34) of the upper wall section (18) of the lower shell (14) to enhance the seal thereat.

Abstract: A pneumatic booster has a housing which includes a forward shell and a rearward shell, and a diaphragm which is installed inside the housing and secured at the outer peripheral portion thereof to the housing. The diaphragm has a bead formed on the outer peripheral portion thereof. The rearward shell has a bead retaining portion which has a bead retaining groove that opens radially outward. The forward shell has an outer peripheral portion. The bead is received into the bead retaining groove across one edge portion of the bead retaining groove and clamped between the groove and the outer peripheral portion of the forward shell. The dimensions of the bead and the bead retaining portion are set so that the inner diameter of the bead is greater than the outer diameter of the edge portion of the bead retaining groove. Thus, the rearward shell and the diaphragm can be assembled together without the need to bend the diaphragm in advance, and the assembly process is correspondingly facilitated.

Abstract: An improved diaphragm, which operates and has the structure of a short-thick beam, is comprised of a plug having a channel, a tire cord reinforcement is bonded to the plug, an elastomer cured to the reinforcement means, and a sleeve bonded to the elastomer. This diaphragm is capable of being used in many applications, particularly, fluid-handling devices.

Abstract: A fluid flow control valve has a diaphragm for sealing against a valve seat. The diaphragm includes two generally vertical annular lips extending upwardly and downwardly from a peripheral bead of the diaphragm. The bead is located at an interface between two mating portions of the valve with the lips received in annular channels located in the mating valve portions. The channels are configured relatively to the lips to bend the lips out of their normal, undistorted orientation to impose a biasing force on the lips tending to seal the lips in the channels.

Abstract: In a tandem type vacuum booster, the booster comprises a first and a second flange, and the second flange is formed with a first stop projection and a second stop projection, the first stop projection being adapted to abut against a predetermined one of the locking claw to stop the flanges at the assembled position before the locking claws interfere with a positioning means during rotation of the flanges to the assembled position, and the second stop projection permitting passing thereover of a locking claw other than the predetermined locking claw during rotation of the flanges toward the assembled position, but coming into abutment against such other locking claw to resist the rotation of the flanges back to the disassembled position when the flanges have reached the assembled position.

Abstract: A free draining, corrosive resistent valve for regulating the flow of corrosive fluids therethrough includes a plastic valve housing. An inlet passage extends into the housing and upwardly therein terminating in a valve seat. An inclined panel surrounds the inlet passage below the valve seat. An outlet passage extends from the lower most portion of the inclined panel through the housing. A plastic valve poppet is located above the seat having a diaphragm therearound with an upwardly extending stem. A plastic retainer is located above the diaphragm into which the stem extends. The retainer is adapted for affixing the diaphragm is a sealing relationship to the valve housing.

Abstract: In the negative pressure booster equipment 1 according to the present invention, a groove 27 is provided on the inner peripheral beads 14a and 16a of the diaphragms 14 and 16, fixed on the valve body 8 and forming the power pistons in order to communicate the variable pressure chambers 5b and 7b divided by the diaphragms 14 and 16 with the passages 26 and 28 corresponding to the variable pressure chambers 5b and 7b. Accordingly, the air passages are opened to the variable pressure chambers 5b and 7b through the groove 27 formed on the beads 14a and 16a of the diaphragms 14 and 16. According to this invention, therefore, there is no need to provide wide gap between the fixed portion of the beads and the center plate in order to open the air passages to the variable pressure chambers. This makes it possible to shorten overall length of the negative pressure booster equipment 1.

Abstract: A diaphragm assembly includes a pair of superposed flexible diaphragms adhesively secured to an annular spacer ring. The space between the diaphragms and the interior of the rings is filled preferably with de-ionized water. The resistivity of the water is monitored to detect conductivity changes upon leakage or diaphragm rupture when pumped materials or pump lubricant mix with the water. Diaphragm assembly and rupture detection methods are disclosed.

Abstract: The present invention provides a tamper-resistant fluid-operated brake actuator having a power spring housed within a head or cap which is attached to a flange case having one or more diaphragms or pistons responsive to changes of fluid pressure within the brake actuator chambers. In one embodiment, the head is attached to the flange case by a substantially continuous curvilinear annular metal retaining member which must be inelastically deformed or destroyed in order to remove the head from the flange case, thus rendering tampering more difficult. In another embodiment, the annular metal retaining member of the present invention is integral with the actuator head and which is metal-spun or the like onto the flange case.

Abstract: A diaphragm device utilized, for example, in a vacuum advance mechanism of a distributor of an internal combustion engine is disclosed. The diaphragm device comprises: a housing consisting of two cup-shaped members coupled to each other at the marginal flanges thereof; a diaphragm extending in the housing to define an airtight chamber therein; and a control rod coupled to the diaphragm to transmit the motion thereof. The outer marginal portion of the diaphragm is clamped between the flanges of the two cup-shaped housing members, wherein the distance between the radially extending flanges clamping the diaphragm therebetween is strictly controlled by a distance regulator, which may be constituted by a step formed in the outer portion of one of the flanges toward the other flange, the outer marginal portion of the diaphragm being received in the stepped-down inner portion of the stepped flange.

Abstract: A brake servo booster has a housing (1) divided into two chambers (A, B) by a movable partition (5) which includes a diaphragm (6). A protective boot (14) for a support member (11) extending through the housing is connected to the diaphragm by a carrier member (16) engaged by adjacent portions (14A, 6A) of the boot and diaphragm in a manner which avoids direct contact between these portions and facilitates assembly of the booster.

Abstract: An improved diaphragm is disclosed which partitions the interior of a shell of a brake booster into a constant pressure chamber and a variable pressure chamber. The diaphragm includes a bead which extends around its inner periphery, and which is formed with a lip extending from the side of the constant pressure chamber to the side of the variable pressure chamber. The lip is held in close contact with the outer peripheral surface of a valve body. The lip is capable of an elastic deformation in a flexible manner, whereby a good seal against the outer peripheral surface of the valve body is maintained.

Abstract: A diaphragm for a diaphragm-actuated fluid-transfer control device, which comprises a flexible, substantially non-stretchable diaphragm body of a substantially circular outline surrounded and delimited by a beaded rim, the body having a substantially dish-like, bi-stable shape invertible from the first stable state, in which a first body surface is convex and a second body surface, concave, to the second stable state, in which the first body surface is rendered concave and the second body surface, convex. The device further comprises at least one substantially rigid, elongated arm fixedly embedded in the diaphragm to a depth exceeding the radial width of the beaded rim, the free end of which arm projects beyond the beaded rim. There is also described a diaphragm-actuated fluid transfer control device including the diaphragm.

Abstract: A solid state pressure sensor utilizes a brittle diaphragm made of a material such as silicon, which is mounted between base plates of glass, and which deflects in response to pressure. The base plates of glass can have recesses formed therein to receive the diaphragm and provide a full support across the diaphragm under overpressure conditions to prevent overstressing the diaphragm, or the diaphragm can have such contoured surfaces for forming overpressure stop surfaces against the facing base plate. The diaphragm has grooves defining a central portion that deflects, and whereby the grooves will form webs joining the central portion to an outer rim so that the diaphragm acts similarly to a "free edge" diaphragm in its deflection characteristics. The grooves defining the webs can have various configurations for achieving the results desired.

Abstract: A fluid pressure-responsive diaphragm comprising a discal body and a holding ring. The holding ring is fastened to the discal body and has an outwardly turned lip formed at the inner edge of the holding ring. The holding ring has a different thickness than the thickness of the discal body. Both the discal body and the holding ring are made of metallic substances. The discal body has a plurality of annular corrugations in a radial periodic waveform configuration and a plurality of radially extending spokes in a circumferential periodic waveform conforming to and integrated with the peaks and valleys of the annular corrugations. The holding ring is fastened to and aligned with the periphery of the discal body and the outwardly turned lip is adjacent to the outermost annular corrugation. A compressible seal is juxtaposed within the area defined by the outwardly turned lip and a surface of the holding ring.

Abstract: The groove (13) for detecting the presence of a fluid between the membranes (1, 2) and indicating that one or other of them has broken, is profiled so as to be bullet-shaped, thereby preventing the membranes from being extruded into the groove under the effect of pumping pressure.

Abstract: A tandem diaphragm vacuum booster in which both diaphragm and the bead seals are made of a single rubber-like molding.

Abstract: A tandem diaphragm vacuum booster in which both diaphragm and the bead seals are made of a single rubber-like molding.

Abstract: In a gas spring apparatus according to the present invention, a cylinder assembly comprises a cylinder housing and a rod fitted therein for axial reciprocation. An oil chamber and a gas chamber are defined inside the cylinder assembly, and the capacity of the gas chamber changes as the cylinder housing and rod reciprocate relatively to each other. A damping force generating mechanism is provided in the cylinder assembly. A flexible bladder includes a body made of elastomer and a gas-barrier film. The film is formed on the surface of the elastomer body. The bladder divides the oil and gas chambers completely. Thus, when the rod reciprocates in the axial direction, relatively to the cylinder, the bladder inflates and deflates. The gas spring apparatus is used for a suspension system of an automobile.

Abstract: A diaphragm for pumps or the like of a dish-shaped body of nonreinforced thermoplastic elastomer having a curvilinear flexure sidewall portion of substantially less thickness than the central and flange portions to which it connects.

Abstract: An improved spring brake construction is formed by a pair of concave metal housng portions having peripheral lips. Once the internal components of the spring brake are assembled within the housing portions, the lip of one housing portion is spun over the lip of the other housing portion to capture and grip it, thereby permanently sealing the housing portions together. The push rod and coil spring within the spring brake are maintained in axial alignment by a central indentation in one of the housing portions that extends coaxially within the coil spring, and by the construction of the spring diaphragm with a central axial protrusion which extends into a central opening in a spring plate on the side of the diaphragm facing the coil spring. On the opposite side of the diaphragm a push rod seat is laterally restrained from movement relative to the diaphragm.

Abstract: A pressure chamber of a diaphragm pump having an outer chamber improved so that it is free from stress concentration. The inner wall surface of the pressure chamber is recessed in a mero-spherical shape. In order to support this chamber wall from its rear side, an outer ring rib is provided along the outermost periphery of the outer surface of the chamber, and an inner ring rib is circumferentially disposed at the inner side of the outer ring rib. Further, radial ribs are provided so as to connect together the outer and inner ring ribs in the radial direction.

Abstract: The diaphragm comprises a peripheral zone (12) and a central zone (16) in the same plane. Between these zones there is a corrugated zone comprising 2n corrugated portions (18.sub.1 to 18.sub.4) which are separated by connection zones (20.sub.1 to 20.sub.4). Any one corrugated portion may be derived from the adjacent corrugated portion by a rotation through 180.degree. about the connection zone, or else by a rotation of 2.pi./2n about the diaphragm axis followed by a symmetry about the housing plane.

Abstract: A rotary actuator for a damper shaft controls the angular position of the damper shaft in accordance with variations in fluid pressure inside of the actuator. The actuator includes a housing, a flexible diaphragm within the housing separating it into a fluid-tight compartment and a second compartment open to the atmosphere. The fluid-tight compartment is provided with a fluid pressure receving port open to a control source of variable pressure. The piston and piston rod are slidably mounted in the second compartment in contact with the diaphragm. The piston rod includes a longitudinally extending rack, and a crank arm rotatably mounted in the housing has a gear segment in meshing relationship with the rack. The actuator shaft to be controlled extends through the housing and is mounted in the crank arm to support the rotary actuator, and the rotary actuator is clipped to an air conditioning duct to prevent it from rotating on the damper actuator shaft axis.

Abstract: An adapter for mounting a diaphragm-type push button control, for remote actuation of a water metering valve, to countertops or lavatories of various thicknesses and through openings having various diameters has a circular cap portion with a diameter greater than the largest opening diameter and a threaded cylindrical shank portion concentric with the cap portion. The diameter of the shank portion is slightly less than the diameter of the smallest opening and the length of the shank is greater than the greatest thickness of the countertops or lavatories. A faucet washer and nut having a diameter greater than the largest opening are threaded onto the shank. An end of the shank has a pipe thread to permit attachment of the push button control thereto. A cylindrical push rod is disposed through a concentric opening in the cap and shank portions with a push button portion thereof extending from a first end and from the cap portion. A second end rests on the diaphragm of the push button control.

Abstract: A self-aspirating and self-bleeding metering pump comprises a metering chamber having an inlet connected with a predelivery chamber and an outlet connected with a metering point. The predelivery chamber is connected with a metering agent tank through a suction conduit comprising a suction valve and a return conduit comprising a head valve. Furthermore, a diaphragm for predelivering into the predelivery chamber is provided. A metering section of the diaphragm cooperates with the metering chamber for performing the metering stroke and comprises a separate drive serving this purpose. In this manner dynamically stressed sealing members are avoided, whereby the self-aspirating and self-bleeding metering pump is resistent also to the metering of aggressive media.

Abstract: A valve (10) comprising a plurality of passages (22,24), and an annular sealing area (30) in communication with one of the passages. The valve also includes a diaphragm (50), movably supported relative to the sealing area (30) in response to a force differential applied thereacross; including a thin, planar, flexible, non-metallic membrane (92) for sealably engaging against the sealing area.

Abstract: A garden sprayer for dispensing pressurized liquids has a pressure vessel mounted within a liquid reservoir container. The pressure vessel carries a diaphragm pump which is detachable as a complete unit and which extends from the container for connection to a pivoted actuating lever that is fulcrumed on the container. The diaphragm, which is directly driven by the pivoted lever, is guided in position and orientation by a guide piston fixed to the diaphragm and slidably guided within the pumping chamber. A pair of input and output check valves, mounted at the end of the pump, permit liquid from the container to be drawn into the pumping chamber and to be forced from the pumping chamber into the pressure vessel. A manually controlled valve on a spray nozzle, which is connected to the pressure vessel, controls pressurized discharge of liquid.

Abstract: An oleoelastic energy accumulator includes a rigid casing, at least one membrane of a polymeric material having a high deformability, and a liquid. The membrane has a curvilinear form, e.g., convex, toward the inside of the casing to the borders of which the membrane is tightly sealed for delimiting or defining a closed space occupied by the liquid. In correspondence with the pressure variations in the liquid, the membrane acts like a piston and passes from an at-rest, curvilinear configuration, to a final substantially flat configuration as a result of gradual and successive compression of the membrane which, in this manner, accumulates energy.

Abstract: A push button assembly for moving a volume of fluid out of and into a port. The assembly has a housing containing a rubber-domed diaphragm. The domed diaphragm is designed so that it is deformable but readily returns to its original shape. The pressing of the push button depresses the diaphragm, thereby forcing air or other fluid out of the exit port. When the button is released, the diaphragm returns to its original shape pulling fluid back through the port.