Abstract: A filling assembly (12), comprising: a container (14) for storing a first fluid composition (38), a pipette (54) removably inserted in the container through an opening (22); and a plug (110) removably to a dispensing end (66) of the pipette, defining an inner compartment (112) isolated from the first fluid composition. The filling assembly comprises a holding element (56) configured to hold the pipette inside the container in a predetermined position while maintaining at least one aperture (70) within the opening, said aperture allowing for fluid communication between the outside and the inside of the container, so that the container and the pipette may be filled simultaneously with the first and second fluid compositions (38, 114) respectively, before assembling the second open end (62) of the pipette with a pressure supply device.

Abstract: A pressure jacket includes a barrel having a proximal end, a distal end, and a sidewall extending substantially circumferentially between the proximal end and the distal end along a longitudinal axis. The pressure jacket also includes at least one retaining member having at least one first lug protruding radially outward relative to an outer surface of the sidewall. The at least one first lug has at least one third surface tapered axially relative to the longitudinal axis of the barrel in a proximal direction. The at least one first lug is configured for engagement with a locking mechanism associated with a port on a fluid injector to releasably lock the pressure jacket with the fluid injector. At least a portion of the at least one third surface axially ejects the pressure jacket upon rotation of the pressure jacket about the longitudinal axis.

Abstract: A lid for a drinking vessel is described. In one embodiment, the lid is an insulated lid configured to engage an opening of a container, where the lid is configured to at least partially retain the liquid within the container. The lid may further include a first opening for exposing the contents of the container to the atmosphere and for drinking from the container if desired. Additionally, the first opening may include an insert designed to reduce the heat transfer between the interior and exterior of the container, while in other embodiments aiding in the equalization of pressure between the interior and exterior of the container. Other aspects and embodiments of the present invention will be apparent from the following detailed description, drawings, and claims.

Abstract: A fluid dispenser includes a dispenser housing, a container for holding a foamable liquid, a foam pump, an outlet in fluid communication with the foam pump, and a vacuum actuated suck-back mechanism in fluid communication with the foam pump and the outlet. The foam pump has a liquid pump portion and an air pump portion. The vacuum actuated suck-back mechanism includes a chamber and a movable member. The chamber has a vacuum port that is in fluid communication with the air pump portion of the foam pump, and a suck-back port that is in fluid communication with the outlet. The movable member of the vacuum actuated suck-back mechanism moves under vacuum pressure to reduce the volume of the chamber. The volume of the chamber increases upon removal of the vacuum pressure.

Abstract: A dispenser head (10) of a trigger dispenser device includes a self-bearing pre-compression valve (80), made of polypropylene, capable of per se retaining in a stable manner to the head frame (14?).

Abstract: An improvement is provided in an actuator for actuating a valve on a container for dispensing a fluent product from the container in a fan spray pattern. The actuator includes a dispensing flow path to direct fluent product from the valve to an exterior of the actuator via an exit orifice located at an end of the flow path, and a post defining a portion of the flow path, the post extending along and centered on a longitudinal axis and having an end face adjacent said exit orifice. The improvement includes a flow channel extending laterally across the end face of the post, the flow channel being symmetric about a lateral axis extending transverse to the longitudinal axis of the post, a portion of the flow channel directly communicating with said exit orifice to direct the fluent product from the flow channel into the exit orifice.

Abstract: A personal dispensing system allows a user to dispense a viscous liquid, such as a disinfectant liquid gel. The dispenser includes a mounting clip which can be worn on the belt of a user. The dispenser has a front sidewall with openings which allow the viscous liquid to be dispensed onto a user's hands. The openings on the front sidewall of the container body and the viscosity of the liquid are selected so that the viscous liquid weeps out of the openings without dripping, or a hand pump can dispense the liquid. The front face of the device can also house a single horizontal roller or a number of roller balls for dispensing the viscous liquid.

Abstract: A fluid dispenser member, such as a pump, having a body (11) for mounting in the opening of a fluid reservoir so as to take fluid therefrom. The body (11) has a fluid chamber (15) that defines a fluid inlet in the form of a socket (12). The dispenser member includes a dip tube (2) for extending into the fluid reservoir so as to take fluid therefrom, the dispenser member further having a reducer sleeve (3) that internally receives an end (21) of the dip tube (2), and that is engaged axially in the socket (12) of the body (11), such that fluid communication is established between the dip tube (2) and the chamber (15) of the body (11). The dip tube (2) presents an outside diameter less than 1 mm and is made of a material that is transparent or translucent.

Abstract: A head (10) of a trigger dispensing device (1) for liquids includes a pre-compression valve (104) disposed in the upper region of the head. The valve (104) has an obturator wall (106) that cooperates with a mouth wall (102) to prevent the passage of liquid. The mouth wall (102) includes a sealing section (102a) with which the obturator wall (106) is sealingly engaged to slide during a pre-compression step of the liquid.

Abstract: A liquid dispenser having a pumping mechanism for consistent and measured dispensing of an alcoholic liquid into a standard “shot” glass. Specifically, in one aspect of the invention, a liquid dispenser is provided having a central body member, a liquid reservoir within the central body member, and a draw tube associated with the liquid reservoir. The liquid dispenser further includes a pump shaft and a pump top connected to an upper end of the pump shaft. In addition, the dispenser is configured to couple to a vessel having a liquid in order to dispense the liquid in a measured and consistent manner in a “shot” glass, wherein the liquid can be an alcoholic beverage.

Abstract: To provide an accumulation valve which is stable and moves sensitively, where the number of parts has been reduced, and an accumulator trigger sprayer assembled with the same. The present invention is an accumulation valve S used in an accumulator trigger sprayer 100 which imparts pressure to liquid in a cylinder by a piston portion 11 to spray liquid from a nozzle portion 5a to the outside, the accumulation valve S including a piston valve portion 21, a spring portion 22 for pressing the piston valve portion 21 to a piston valve seat, and a mounting portion 23 for mounting the spring portion 22 to the piston portion 11, wherein the piston valve portion 21, the spring portion 22 and the mounting portion 23 are formed integrally.

Abstract: A washing machine includes a wash tub in which wash water is stored, a detergent supply device to supply detergent into the wash tub, and a water supply hose to supply the wash water from an external water supply source to the detergent supply device and subsequently into the wash tub. Movement of the wash water through the water supply hose is carried out by a hydraulic pressure of an external water supply source in an entire region of the water supply hose.

Abstract: Springs having various configurations include upper and lower connecting members and spring elements extending therebetween. The configurations of the springs may enable them to be formed of polymeric material such as by injection molding. Pumps for pumping fluid or adapted for other uses may include such springs and may include interfacing arrangements with the springs.

Abstract: A liquid dispensing device is presented. The device has a main body and a dispensing head. The main body includes a pressure chamber, a pressure spring and a pressure piston, and the dispensing head includes a piston and a piston chamber, a channel in fluid communication with the pressure chamber, an inlet valve provided between said channel and said piston chamber, an outlet valve, an outlet channel, and an outlet valve lock.

Abstract: Described is a fluid dispensing container having a bottle and fluid withdrawing assembly for liquids, such as liquid cleaners and the like. The bottle has an integral dip tube formed therein connecting at a landing below the top of the bottle neck, fluidly connecting the inside of the bottle with the top opening of the bottle. A fluid dispensing mechanism, such as a pump or trigger-sprayer, is attached to the top of the bottle to take fluid up through the integral dip tube and dispense the fluid accordingly. The fluid dispensing mechanism may be aligned to allow a direct connection between integral dip tube and the fluid dispensing mechanism at a landing below the bottle opening. The fluid dispensing mechanism may be attached to the bottle with a snap-fit connection.

Abstract: A pump has a PVC “T” shaped member having an inlet, an outlet and an interior pumping chamber positioned between the inlet and outlet; a piston displaceable into the chamber; an air cylinder for driving the piston into the chamber; a spring for biasing the piston outwardly from the chamber in opposition to force applied by the air cylinder; a washer-urethane disk check valve at the conduit inlet permitting fluid flow into the chamber but precluding fluid flow out of the chamber responsively to piston displacement into the chamber; and a washer-urethane disk check valve at the conduit outlet permitting fluid flow out of the chamber responsively to fluid pressure increase resulting from piston displacement into the chamber.

Abstract: A novel metering device (1) for dispensing a dose of a pressurized fluid is described. A dispensing valve body (3) is mounted in a fluid-tight manner to the lid (4) of a pressurized container (5), which circumvents a valve element (9). A valve delivery tube (10) is connected to the valve element (9). A chamber (13) surrounds the valve body (3), in which a piston (17) is reciprocable between an upper and a lower position, which define the dispensing dose. A clearance is provided between the piston (17) and the inner wall (23) of the chamber (13), such that pressurized fluid can flow into the chamber based on a pressure difference between the container (5) and the chamber (13), and the piston (17) is adapted to seal the valve body (3) when being in the upper position.

Abstract: The invention pertains to a cartridge (1) with at least one chamber (6a, 6b) for accommodating a substance that respectively features a dispensing opening (11a, 11b) and another opening that is closed by a piston (8a, 8b) that can be displaced in the chamber and serves for dispensing the substance. The cartridge (1) furthermore features a piston rod mechanism (4) for displacing the piston (8a, 8b) in the chamber (6a, 6b). In this case, the piston rod mechanism is composed of several piston rods (14, 14a, 14b, 15, 15?) that can be transferred from a first dispensing stage to a second dispensing stage with the aid of a spring element (18, 18a, 18b).

Abstract: A dispenser for dispensing portions of flowable materials has a piston that is advanced along a dispensing chamber by rotation of a spindle that passes through the piston. A stop may limit travel of the piston to control the volume of flowable material dispensed. The stop may be adjustable. In an example hand-held dispenser the spindle is rotated by a rack and pinion mechanism that can be operated with one hand. The dispenser may be used, for example, for dispensing portions of condiments, sauces or the like.

Abstract: A fluid dispenser member having a body and manually-actuated dispenser mechanism movable in the body between rest and dispensing positions. The dispenser mechanism urged by a resilient member towards the rest position by a plurality of spring cells arranged in parallel around a longitudinal axis of the resilient member, forming a spring stage. The resilient member includes a plurality of spring stages that are superposed along the longitudinal axis. A spring stage has a top undulating ring having multiple undulations, and a bottom undulating ring having multiple undulations, the top and bottom undulations arranged relative to each other so that the top and bottom undulating rings are in contact at a plurality of contact points distributed around the longitudinal axis. A spring cell is defined between two adjacent contact points of the spring stage, the resilient member is made of a synthetic material.

Abstract: A fluid dispenser pump (10) including a pump body (11) and a piston (20) that slides in leaktight manner in the pump body (11) between a rest position and an actuated position. The piston (20) is secured to an actuator rod (30) that extends axially out from the pump body (11). A ferrule (40) is mounted on the top edge (12) of the pump body (11), the ferrule (40) defining the rest position of the piston (20). The ferrule (40) co-operates in leaktight manner with the actuator rod (30) while the actuator rod (30) moves between the rest position and an intermediate position, and the ferrule (40) co-operates in non-leaktight manner with the actuator rod (30) while the actuator rod (30) moving between the intermediate position and the actuated position, so as to make it possible to vent the pump (10).

Abstract: A pre-compression system for liquid dispensing devices, such as sprayers, is presented. The pre-compression system includes a pump chamber and a valve chamber including a pre-compression valve member. The valve member is operable to allow liquid in the pump chamber to exit via an outlet only after a predetermined pressure is reached in the pump chamber, and to stop liquid from exiting when the pressure in the pump chamber falls below the predetermined pressure. The valve member includes an elastic diaphragm and a valve seat. The valve member has a concave surface facing a valve seat opening and a convex surface in communication with atmospheric pressure.

Abstract: The invention relates to a multi-way valve device, particularly for household appliances, comprises a hollow body (11) and an axially movable piston (12) mounted inside this hollow body. The body (11) is provided with at least one inlet orifice (15) for a liquid solvent and at least two outlet orifices (16, 17) for this solvent. The movable piston (12) is coupled with an axially movable measuring stem (31) of a linear measuring element (30) of a solid substance, this measuring stem (31) being actuated by a mechanical actuator (32) and associated with a return spring (35). This movable piston (12) is arranged so as to move in one direction, freely, or against the pressure of the return spring (35), under the effect of the pressure of the liquid solvent applied at the inlet orifice (15) to this movable piston (12), and in the opposite direction, under the effect of the pressure applied to the measuring stem (31) by the return spring (35).

Abstract: An antomizing foam pump creates atomized droplets of a foamable liquid in air in a compression chamber. The compression chamber is then collapsed to force the droplets and air through a mesh screen to create a foam product.

Abstract: A foam pump including a pump housing with a liquid chamber in fluid communication with a foamable liquid filled container and an air chamber in fluid communication with a high pressure air source through an air inlet. The foam pump also includes a dispensing tube having a wiper seal post with a closed distal end positioned within the pump housing, and an outlet tube with an open distal end positioned outside the pump housing. The wiper seal post includes at least one inlet hole in fluid communication with the liquid chamber, and a check valve near the second open end. The foam pump further includes at least one foam screen in the open end of the outlet tube, a wiper seal slidably positioned around the wiper seal post and in sealing contact with the pump housing and the wiper seal post, and a spring bias to bias the wiper seal in an unactuated position.

Abstract: A system for use in association with a container and a pump having an intake for transferring semisolid material from the container. The apparatus includes a first element that is inserted into the container and a second element that is also inserted into the container and moves the semisolid material with respect to the first element. An actuator moves the second element together with the semisolid material towards the intake of the pump. A method for use in transferring semisolid material from the container is also disclosed.

Abstract: A sprayer includes a discharge valve assembly and includes an integrated poppet valve, spring and volume reducer. The spring includes more than omega-shaped form, each with relatively flat sides. The spring can have sides with portions sufficiently wide to substantially extend across the valve chamber to provide stability to the spring and prevent buckling. The flat sided omega-form construct is relatively easy to manufacture via molding and the ends of such construction provide suitable locations for integrated molding with the valve and the volume reducer.

Abstract: A dispensing pump for liquid or pasty products having a pump chamber (2) and a piston (6) arranged to move telescopically within the pump chamber between rest and active positions, wherein an inlet valve (5) is provided at one end of the pump chamber. This inlet valve may be locked closed with the piston in its rest position.

Abstract: A pump assembly with a pressable head includes a push tube, an inner tube, a stop valve, and an outer tube; a top of the push tube passing through the outer tube; the push tube communicates with the inner tube; a bottom of the inner tube is formed with an annular plug; the annular plug of the inner tube has a plurality of via holes defined therein. The via holes have inclined inner walls. A top of the inner tube has a stop valve; the stop valve is a flat structure; an elastic structure is formed on a periphery of the stop valve; by elastic deformation of the elastic structure, the stop valve tightly adheres to an inner wall of the outer tube; an interior of the outer tube has a stepped structure with a greater diameter at an upper side and a smaller diameter at a lower side.

Abstract: A push-type dispenser which has a cylinder as thin as possible and is free from deformation is provided. A pump dispenser (A) has a cylinder (1), a piston (4) slidably attached to the cylinder (1) from inside, and a nozzle head (2) having a nozzle opening (N) coupled to the piston (4). The pump dispenser discharges liquid from the nozzle opening (N) by applying a pressure to the liquid filling the interior of the cylinder (1) by pushing the nozzle head (2), wherein the wall of the cylinder has a thickness of 0.6 mm to 1.3 mm.

Abstract: An apparatus for dispensing material includes: a chamber for the material, the chamber sealed by a flexible seal; a nozzle coupled to the chamber and residing at a front end; and a pump, the pump comprising: a piston that moves in a tube, and an activator. When a user presses the activator, the piston moves toward or away from the front end, and a portion of the material is emitted onto the user's palm or fingers. The pump emits the portion of the material regardless of a direction of gravitational pull. In one embodiment, the piston emits the material by directly contacting the material in the chamber. In another embodiment, air is allowed into the chamber through a weep hole, which resides between the piston and the material. The air is used to expel the material through the one-way valve.

Abstract: Pump for applying an increased or reduced pressure to a container. The pump is provided with a plate-like part which reacts to the pressure difference between the container and the environment. This part can preferably adopt two stable positions, and a change is signalled. This change can be brought about, for example, by the sound generated as a result of the plate-like part turning over. The pitch and the like of the sound can be influenced by arranging the plate-like part in a hollow piston and providing the latter with openings leading to the environment.

Abstract: A pump mechanism of liquid soap dispenser includes a cross pipe secured to a first check valve, a spout having a second check valve, and an abutment member respectively; a spring biased plunger partially inserted into the abutment member; and a cap on an end of the plunger. In response to depressing the cap the plunger slides to compress the spring, close the first check valve, and decrease a liquid storage space of the pipe for forcing pressurized soap to open the second check valve prior to flowing out of the spout. In response to removing the depressing force the spring pushes the plunger to its inoperative position to create a vacuum in the space, open the first check valve, permit soap supply to flow into the space through the first check valve, and close the second check valve at an end of returning the plunger to its inoperative position.

Abstract: The invention relates to a distributor for a liquid product, in particular, a miniature spray, having a reduced number of parts. The distributor includes a reservoir and a manual action pump, provided with a hollow push-button, arranged such as to slide in a sealed manner with relation to the exterior of a tubular neck of the pump body, defining a dosing chamber, extending at least partly into the interior of the push-button.

Abstract: A pump for fixing on a receptacle includes: a stationary portion including a pump body; a moving assembly movable relative to the pump body and co-operating therewith to define a variable-volume pump chamber; an opening in the pump body that enables the pump chamber to communicate with the inside of the receptacle and enables the pump to operate in a head-down position; an air intake passage, distinct from the opening, between the stationary portion and the moving assembly; a first lip configured to press in a leaktight manner against the pump body and to prevent communication via the opening between the inside of the receptacle and the pump chamber; and a second lip arranged, at least when the moving assembly is in an end-of-stroke position, to prevent communication through the inside of the pump body and via the opening between the inside of the receptacle and the outside.

Abstract: The object of the present invention is a head of a fluid dispensing device, provided with elastic return means, outside the pumping chamber, comprising a return element provided with an elastic portion which when the trigger is actuated, is mainly subject to a torsion status. The head exhibits considerably improved reliability.

Abstract: A trigger type fluid dispenser (100) according to the invention includes a body (110) having a discharge flow path (111) and a cylinder (112) disposed in parallel with the discharge flow path (111), and a piston (140) in the cylinder (113) is caused to slide by a trigger (130). The trigger (130) is configured so that a hook portion (131) thereof is held to be swingable by the body (110), a turned-down portion (131) of an extension portion, which is an elastic portion (132) integrally extending from a swinging portion (114) of the hook portion (131), is held with respect to the body (110), and a tip end (132e) of the extension portion is positioned to be capable of coming into contact with the hook portion (131). The body (110) is configured so that a cover (120a) is installed to form an internal space (R) between the cover (120) and the discharge flow path (111), and a core element (150) is inserted in the discharge flow path (111) and the internal space (R).

Abstract: An accumulator-type liquid sprayer includes a piston arranged in a cylinder, a piston guide extending through a passage extending therethrough in an axial direction of the piston, so as to be engageable with, and disengageable from the piston, cooperating with the piston and the cylinder to form a space region for sucking and pressurizing a liquid, a check valve for opening a suction port of the cylinder during suction of the liquid, and a hollow stem slidably fitted with an outer side of the piston in a liquid-tight manner and engaging with an end portion of the piston guide. A first resilient member urges the piston guide against the piston for maintaining a closed state of the passage in the piston, and a second resilient member urges the piston against the piston guide for adjusting a spraying pressure of the liquid.

Abstract: A dosing device for at least one medium includes a casing part connectable to a medium reservoir, having a pumping device located in the casing part and an applicator connected to the pumping device. The pumping device is provided with at least one inlet valve, as well as at least one outlet valve associated with the applicator and a stroke-movable pumping body. The casing part, applicator and all parts of the pumping device are provided coaxially to a pumping axis with plug connection sections. The casing part, applicator and the parts of the pumping device can be functionally assembled along the pumping axis to form the dosing device.

Abstract: An assembly including a pump attachment particularly adapted to form an nonaerosol pump sprayer, and a method of using the same. The apparatus desirably includes an attachment having a pump sprayer which is pressurized on the upstroke enabling the sprayer to be shipped and stored in a relaxed position. The attachment includes a body, a coupling, a shaft, a piston, an inlet valve and a biasing member. The body defines an elongate chamber having the first end, second end, and an interior wall extending between the first end and second end. The coupler is sized and shaped to secure the body to the neck of a container. The shaft extends through the opening in the first end of the chamber and defines an internal flow channel. The piston is reciprocally mounted within the chamber and includes an inner annular surface surrounding the shaft and an outer annular surface sized and shaped to form a sealing engagement with the interior wall of the body.

Abstract: A self-contained viscous liquid dispenser with a spray pump mechanism includes a housing defining an internal liquid reservoir. A spray pump mechanism is configured with the housing and includes a horizontally disposed pump chamber fitted through an opening in the housing to extend into the reservoir. A pump cylinder is slidably disposed and retained in the chamber. Upon actuation of the pump cylinder, a valve and spray forming mechanism converts a liquid stream expelled from the pump chamber into a spray.

Abstract: A valve mechanism for a pressure chamber, particularly a pumping device, includes a tappet and a valve disk, in which the valve disk is attached to the tappet. The valve disk is provided on the tappet so as to be movable in relative manner between a starting and an end position.

Abstract: An assembly including a pump attachment particularly adapted to form an nonaerosol pump sprayer. The attachment includes a body, a shaft, a piston, an inlet valve and a biasing member. The body defines an elongate chamber having the first end, second end, and an interior wall extending between the first end and second end. The shaft extends through the opening in the first end of the chamber. The piston is reciprocally mounted within the chamber and includes an outer annular surface sized and shaped to form a sealing engagement with the interior wall of the body.

Abstract: The invention relates to a metering pump comprising a pump barrel (1) housing a dose chamber (32) and control means that can be moved between a discharge position and a rest position. The inventive metering pump is characterised in that the control means comprise: a push rod (2); a piston (3) that can slide in relation to the push rod (2) and in relation to the pump barrel (1) all the while remaining in permanent contact with said two elements; and an elastically-deformable annular valve (4) that rests permanently against the push rod (2). The control means are moved between the rest position and the discharge position in two steps; the push rod (2) slides in relation to the piston (3) in the pump barrel; and subsequently the push rod (2) and the piston (3) slide jointly in the pump barrel (1) and discharge opening (42) is released.

Abstract: A dispenser for dispensing metered amounts of a viscous liquid includes a liquid reservoir and a pump chamber having an opening in communication with the reservoir. A pump mechanism including a pump cylinder with a dispensing channel therethrough is configured with the pump chamber and is movable from a rest to a pressurizing position upon actuation thereof to pressurize liquid within the pump chamber. A dispensing orifice is defined at one end of the dispensing cylinder. A check valve mechanism is disposed in the opening. During shipment or storage, the pump cylinder is locked in pressurized position. When locked in pressurized position, the dispensing channel engages the check valve to seal the opening and also prevent flow from the pump chamber to the dispensing channel.

Abstract: The present invention relates to a low profile, fine mist, finger-operated, precompression-type spray pump, and more particularly to a spray pump provided with a second valve of the novel structure being moveable between a poppet valve and a bottom entrance of housing, to precompress the fluid as a liquid content and then spray, whereby the spray pump can be operated even with a short travel distance of a piston, which enables to make the height of a push button spaced from a closure to be shorter than the existing ones, and the pumping process can be smoothly performed without leakage and can also be started with small empty pumping numbers. In addition, the spray pump according to the present invention is constructed with small numbers of constituent parts, resulting in the significant reduction of manufacturing cost and assembly cost.

Abstract: Pump (4) which is actuable by a hand lever for spraying liquid (3), especially for placing on bottles (1) with a pump piston (13) which is linearly displacable in a pump chamber (17) on a housing side, against force of a compression spring, for spraying the liquid (3) out of a mouthpiece nozzle (24).

Abstract: A valve assembly includes a valve housing defining a metering chamber and an elongated stem. The stem is axially movable with respect to the valve housing for dispensing liquid and is rotatable for adjusting the length of the stroke of a piston to thereby select the volume of liquid dispensed with each actuation of the stem. A sliding float member is fitted around the stem within the chamber and is axially slidable with respect to the stem but is locked for rotation with the stem. The lower surface of the sliding float is locked for axial movement with the piston but is independently rotatable with respect to the piston. A pair of spaced poles extends parallel to the axis of the float and engages vaginations in a surface of the housing to thereby limit the length of the stroke of the piston. The poles of the float and the complementary pairs of vaginations in the housing are angularly spaced a distance of less than 180 degrees.

Abstract: A manually-actuated fluid dispenser pump including a pump body (10) containing a pump chamber (20), said pump chamber (20) being defined between an inlet valve (30) and an outlet valve (40), a piston (50) being mounted to slide in said pump body (10) between a rest position and a dispensing position for dispensing the fluid contained in the pump chamber, said piston (50) being connected to, and in particular integral with, an actuating rod (60) provided with an expulsion channel (65), said inlet valve (30) including an inlet valve element (31) mounted to move in the pump body (10) and co-operating with said pump body (10) or with an element secured to or integral with said pump body to define the open and the closed positions for said inlet valve (30), said outlet valve (40) including an outlet valve element (41) mounted to move in the pump body (10) and co-operating with said actuating rod (60) or with an element secured to or integral with said actuating rod to define the open and the closed positions for s

Abstract: A dispensing pump for liquid or pasty products comprising a housing (2), a piston (6) arranged to move telescopically within the housing between rest and activated positions and a plastics spring (9) arranged to return the piston from its activated to its rest position. The plastics spring has a folded, concertina configuration to provide the required return force for the piston. The spring also has end plates (91, 92), which can be adapted increased functionality. The whole pump may be moulded from a plastics material and has few component parts.