Abstract: The trigger sprayer comprises: a body having a cylinder therein; a liquid inlet in communication with the cylinder; an outlet waterway in communication with the cylinder; an outlet nozzle which has an outlet orifice and which is movable to and from a position in communication with the waterway; a piston having an inner and an outer end and being received in said cylinder and being movable between an outer at rest position and an inner pumping stroke position during the pumping strokes of the piston in the cylinder; a trigger operatively coupled to the body and acting on the outer end of the piston; a precompression valve in the cylinder, the valve being operable to allow liquid in the cylinder to enter the waterway only after a predetermined pressure is established in the cylinder and to stop liquid from entering the waterway when the pressure in the cylinder falls below the predetermined pressure; and, biasing structure for biasing the piston away from the valve.

Abstract: The present invention relates to a dispenser for feeding out convenient units of two liquid products. The dispenser (1), preferably, is intended for manual handling and manual feed-out of viscous products, such as mustard (2), ketchup (3), or similar sauces on food products, such as hamburger bread rolls (4) or the like. To bring about an essential reduction of the time required for feeding out convenient units of the two liquid products (2, 3), the dispenser (1) was a first container (5) holding one liquid product (3), a second container (15) positioned within the first container, the second container holding the other liquid product (2), and a pump assembly (18) adapted to simultaneously feed out convenient units of the two liquid products (2, 3) from their respective containers (5, 15).

Abstract: A liquid dispenser device comprising a shell (24) adapted to be wall-mounted substantially vertically in a bathing or washing area and to removably and replaceably receive and hold one or more elongate bottles (20) for liquids useful before, after, or while bathing, each bottle (20) having a valve assembly (22) operable by a push button (74) along an axis extending substantially normal to the longitudinal axis of its associated bottle as positioned substantially vertically for use. The shell (24) has a hinged and preferably lockable cover part (28) that can be propped open when raised for allowing a bottle (20) to be removed for refilling. Most of the components of the dispenser device are preferably fabricated from a thermoplastic, as by well-known injection molding techniques.

Abstract: A spout for a liquid pump includes a first valve body mounted onto an outlet of a liquid pump. The first valve body includes a bottom part that has a flowing hole, and a cylindrical body and a shaft extend from the bottom part. The cylinder body and the shaft define an annular space in which the flowing hole is disposed. A second valve body includes an engaging part engaged with a distal end of the cylinder body of the first valve body, and a cylindrical body extends from the engaging part. The cylindrical body is partially disposed within the annular space and has a smaller diameter at an end so as to form an end opening part of the cylindrical body that is resiliently fittable on the shaft.

Abstract: An improved condiment dispensing system for delivering a measured quantity of condiment at a desired flow rate. The system comprises a pump which is fluidly connected to a condiment source and a dispensing apparatus. The dispensing apparatus includes a valve assembly which is connected to a pressurized fluid source and to the pump whereby actuation of the valve assembly causes a measured quantity of the condiment to be dispensed from an outlet nozzle contained thereon.

Abstract: A low cost trigger sprayer has a housing with a first liquid passage containing a spinner assembly. A pump element is positioned generally horizontally such that pulling the trigger contracts or retracts the element and releasing the trigger permits the element to return to an extended position. An elastomeric spring is positioned between the housing and pump element to improve the return characteristics of the pump element. The sprayer includes a low cost spinner assembly and low cost valving to control the flow of liquid within the sprayer. In one aspect of the invention, the housing has front and rear sections with the rear section having a saddle portion and being hinged to the front section for pivotal movement from an open position for molding the housing to a closed position for operating the sprayer.

Abstract: A vertical hollow cylinder has a recess adjacent an upper end and a lower end constituting a throat. A vertical hollow outer piston is slidable in the cylinder with upper section extending above the cylinder and a lower section disposed within the cylinder. The lower section has first and second vertically spaced horizontal extensions disposed in slidable sealing engagement with the cylinder wall and has a third extension in slidable sealing engagement with the throat. The outer piston also has first and second vertically spaced channels extending from the second inner wall into the interior of the cylinder which are disposed respectively above the first extension and below the second extension. A lower variable volume is defined by a portion of the cylinder wall subtended between the second and third extensions and communicates with the second channel. A member is disposed within the recess, in sealing engagement with the upper section of the outer piston and cylinder wall.

Abstract: The present invention has its object, the provision of a liquid sprayer capable of spraying a long time and a simple construction with respect to liquid sprayers having a cylinder and a piston. In order to accomplish this object, the liquid sprayer according to the present invention is constructed so as to have a long piston stroke, and has an operating member up- and downwards slidably located on the container body having a cylinder, a stem hung from this operating member and fitted into the cylinder, a trunk-like piston being provided at the lower end of the stem sliding in the cylinder together with the up- and downward movements of the operating member, a spring provided in the interior of the cylinder and energizing said piston and said stem downwards, a depressing spraying head provided on the operating member, and a discharge valve provided in the interior of the operating member and communicating the stem with the depressing spraying head together with the depression of the depressing spraying head.

Abstract: A discharge apparatus (1a) has at least one slide (7a) with a bearing and/or contact surfaces (17a, 21a or 31a, 35a) engaging in pretensioned manner in at least one working position, in which for at least one of the surfaces is provided a device (20, 20'), with which it is possible to vary the compressive stress acting on the surface as a function of the control path of the slide. For example, piston lips (18a, 22a) can be relived in the rest position for reducing temperature-dependent deformation tendencies, or a valve closing stress can be increased or decreased.

Abstract: An assembly for spraying a liquid comprises a dispensing head (3) fixed onto a container (2). The dispensing head (3) includes two chambers (34, 35) aligned on the same longitudinal axis and contained in a single body (33). The two chambers are separated by a transverse partition (39). The first chamber (34) is closed by a piston mounted so as to slide with respect to a rod (7). The rod (7) carries, at its end opposite the piston (6), a point (71) whose seat is the opening (37) for communication between the first chamber (34) and the second chamber (35), which opening is made in the partition (39). The first chamber (34) is connected to the container (2) by a non-return valve (9). The second chamber (35) is provided with a spray nozzle (11) which, being located on a fixed wall, is itself fixed.

Abstract: A device for the conditioning and the distribution of pasty or liquid products comprises a casing 1 in which is located a primary chamber 3 divided in two parts by a free piston 4. This primary chamber 3 communicates with a secondary chamber 7 thanks to an aspiration channel in which is located a non-return valve 9. The secondary chamber 7 comprises a piston 16 freely sliding in this chamber and tightly connected to a push button 17 which comes out of the casing. The secondary chamber communicates by an expulsion channel having a non-return valve 12 with an expulsion hole 2 of the product. Under the action of the control piston 16, the product dose contained in the secondary chamber is expelled. When the piston 16 comes back in position a new amount of product passes from the primary chamber 3 toward the secondary chamber 7, and the non-return valve 12 prevents any intake of air inside the casing.

Abstract: An improved condiment dispensing system for delivering a measured quantity of condiment at a desired flow rate. The system comprises a pump which is fluidly connected to a condiment source and a dispensing apparatus. The dispensing apparatus includes a valve assembly which is connected to a pressurized fluid source and to the pump whereby actuation of the valve assembly causes a measured quantity of the condiment to be dispensed from an outlet nozzle contained thereon.

Abstract: A wall mountable cream tube dispenser for dispensing cream is disclosed. The dispenser includes a wall mount having a slot and a movable locking lever with a tongue, and includes a separate dispenser mechanism provided with a guide plate having a groove. The lever is elongated and has a proximal end attached to the wall mount and a distal end spaced therefrom. The tongue is positioned between the proximal end and the distal end of the lever. The wall mount is mounted on a wall or other supporting surface and the guide plate is inserted into the slot whereupon the tongue is received into the groove to form a tongue-in-groove connection. The tongue-in-groove connection is decoupled by pressing on the free end of the lever thereby deforming the lever and pulling the tongue from the groove. Various types of cream tubes may be attached to the dispenser mechanism, including toothpaste, hand and face creams, hair gel and the like.

Abstract: An improved condiment dispensing system for delivering a measured quantity of condiment at a desired flow rate. The system comprises a pump which is fluidly connected to a condiment source and a dispensing apparatus. The dispensing apparatus includes a valve assembly which is connected to a pressurized fluid source and to the pump whereby actuation of the valve assembly causes a measured quantity of the condiment to be dispensed from an outlet nozzle contained thereon.

Abstract: Pump apparatus for delivering water based formulations as an aerosol spray provides for quantities of liquid and air to be pressurized in separate chambers by pump action. Liquid is dispensed through an orifice via a dispensing channel which in one embodiment is purged during a terminal part of the actuating stroke by the release of air through the dispensing channel. In the second embodiment air and liquid are mixed during the actuating stroke so as to be dispensed together and during a return stroke air is sucked through the dispensing channel to remove residual liquid. The air purging action prevents the build-up of deposits in the dispensing channel and orifice.

Abstract: The atomizer bottle (10; 110), operable by manual squeezing, comprises in addition to the actual bottle (12, 112) containing the liquid to be atomized an atomizer capsule (22; 122) which closes the mouth (20: 120) of the bottle (12; 112). In the capsule (22; 122) there is inserted an atomization insert (26; 126) comprising a nozzle (27; 127) from which the atomized liquid emerges. The atomizer bottle (10; 110) also comprises a conventional pump (32; 132) with the relative dip tube (60; 160). The pump (32; 132) is enclosed within the bottle (12; 112) and is operable by axially pressing a hollow shaft (30; 130) projecting from it. The hollow shaft (30; 130) of the pump is rigid with the capsule (22; 122), and the interior of the shaft (30; 130) communicates with the nozzle (27; 127).

Abstract: For restoring purposes, a discharge apparatus (1) has a gas spring (53) and for the displacement of dead volumes a filling body (70) which, like two valve bodies (23, 54) movable against one another of two valves (21, 55) with different functions, can be formed by a single component. An exposed operating ram or plunger (20), which surrounds an outlet channel (19) and is contact-free over most of its length, is constructed in one piece with a pump piston (17) and a nozzle core (48) of an outlet opening (8), while being directly connected to the spring (53). This gives high operational reliability of the discharge apparatus (1) with a simple construction.

Abstract: A finger actuated pump dispenser employs a first upper hollow vertical cylinder with a first diameter and open upper and lower ends and a second lower hollow vertical cylinder with a second and smaller diameter and a closed lower end with a central opening. The lower end of the first cylinder is joined to an open upper end of the second cylinder. The inner wall of the second cylinder has a horizontal annular recess. A first vertical hollow piston has openings in top and bottom ends and extendings slidably above and within first cylinder. The first piston has an enlargement intermediate its ends peripherally engaging and defining a first unbroken seal with the inner surface of the first cylinder. A second vertical piston has a central vertical bore extending therethrough and is disposed slidably within the second cylinder. The second piston peripherally engages and defines a second seal with the inner surface of the second cylinder.

Abstract: A pump dispenser has a body consisting of two hollow cylinders of dissimilar diameters, the diameters of the two cylinders defining an outer boundary of a pump chamber. A piston defines the inner boundary of the pump chamber. The piston also defines a slidable seal with both body diameters and is provided with an aperture which can function as an outlet port on a downstroke and an inlet port port on an upstroke. A stem cooperates with the piston to form a discharge path which can be opened or closed and also cooperates with the aperture to define the ports. The stem is biased to close the discharge port when the dispenser is in rest position.

Abstract: An improved condiment dispensing system for delivering a measured quantity of condiment at a constant flow rate. The device comprises a pump which is fluidly connected to a condiment source and a dispensing apparatus. The dispensing apparatus includes a valve assembly which is connected to both a pressurized fluid source and to the pump whereby actuation of a valve assembly contained on the surface of the dispensing apparatus causes a measured quantity of condiment to be dispensed from an outlet nozzle contained thereon.

Abstract: A dispensing pump having a minimal number of molded plastic components is configured to have a relatively low. profile when mounted on a spray container. The pump includes a base having a chamber depending downwardly therefrom within which is received a piston biased by a spring. The piston has a piston rod which extends upwardly through the base for coupling with one leg of a L-shaped handle pivoted on the base. Upon squeezing the handle, the handle rotates to lift the piston to pressurize liquid in the container. The liquid is dispensed laterally of the base through a valve body which includes a rotatable valve element seated therein. The rotatable valve element rotates about an axis perpendicular to the valve body and includes both an opening for releasing a stream of liquid from the pump and an opening for releasing a spray of liquid from the pump. In order to refill the chamber with liquid from the container, a dip tube extends from the base and is in communication with the chamber.

Abstract: A dispenser apparatus includes a central housing, with the central housing mounting a supply container upper end thereof, wherein the supply container is arranged in varied orientation coaxially aligned with a delivery tube directed below the central housing. A trigger housing mounted to the central housing effects reciprocation of a control rod, with the control rod mounting a door plate within the central housing to permit communication between the container and the delivery tube. A modification of the invention includes end cap structure mounted to a lower distal end of the delivery tube to include a first cap formed with an apertured floor, and a second cap including a grinding mechanism to effect pulverizing of granular material for greater and more rapid absorption of pesticide components within a dispensed area.

Abstract: An atomizing pump for dispensing liquids from a container which has a low profile and is non-throttling. The pump comprises a body, a spring biased piston, a lower valve openable and closable by both pressure in the pump body and by frictional interengagement with the pump piston with an extending upper end of the lower valve, and an upper valve that frictionally and sealingly fits in a lower chamber in the piston, but which can be moved against a spring force and the friction force when pressure in the pump reaches a critical limit, so that the upper valve moves into a larger upper chamber so that liquid can escape from the pump body. The upper valve preferably has an extending stem that contacts the extending upper end of the lower valve during the terminal portion of a downward stroke of the piston and an initial portion of an upward stroke of the piston so that the upper valve can be held open.

Abstract: A precompression metering pump has already been mounted on a pressurized receptacle in the prior art. It serves not only to propel the contents of the receptacle for spraying purposes, but also to isolate said contents from ambient air in order to prevent it being degraded. However, in the past such a pump has been provided with a return spring capable of raising the pistons of the pump to a rest position regardless of the pressure inside the receptacle. Consequently, should a leak arise from the receptacle, there has been a danger of delivering a substance that has been degraded by contact with the atmosphere. The present invention avoids this problem by making spraying impossible should the pressure inside the receptacle fall below a predetermined pressure which is advantageously chosen to lie in the range 1 bar to 2 bars above atmospheric pressure.

Abstract: In a fluid dispenser a spring biased piston is mounted for reciprocable movement along a stem member which is moved longitudinally to actuate the dispenser. A metering chamber is located between the end of the piston and the end wall of a cylindrical chamber in which the piston is mounted, and axial passageways extending from opposite ends of the stem connect the metering chamber to a discharge location when the stem is in a discharge positon and connect the metering chamber to a fluid reservoir when the stem is in a fill position.

Abstract: A liquid pump dispenser has a stationary spout, a fixed piston and a reciprocating cylinder therewith defining a variable volume pump chamber. The dispenser has container venting and pump priming features, and includes an inlet/discharge valve housing. The dispenser has a reduced number of parts for simplicity and economy.

Abstract: The lower end of a first hollow vertical cylinder curves inwardly to merge with the upper end of a lower second cylinder. A hollow vertical piston extends through a top opening of the first cylinder into the first cylinder and is vertically movable therein with a lower end of the piston slidably engaging the inner surface of the first cylinder. A vertical member has upper and lower integral sections, the lower section being enlarged with respect to the upper portion, the upper section being engagable or disengagable with the upper end of the piston to define a first closed or open port therewith. A third vertical hollow cylinder has a lower end in continuous fluid sealing engagement with the inner surface of the second cylinder. An upper end of the third cylinder is engagable or disengagable with the lower section to define a second closed or open port therewith. The first port is open when the second port is closed and vice versa.

Abstract: An improved condiment dispensing system for delivering a measured quantity of condiment at a constant flow rate. The device comprises a pump which is fluidly connected to a condiment source and a dispensing apparatus. The dispensing apparatus includes a valve assembly which is connected to both a pressurized fluid source and to the pump whereby actuation of a valve assembly contained on the surface of the dispensing apparatus causes a measured quantity of condiment to be dispensed from an outlet nozzle contained thereon.

Abstract: A trigger-type device for operating a pump of the axial displacement piston type against a bias spring, sprays liquids out of a handheld container. The pump has a delivery head which is movable axially with the piston and provided with a delivery conduit set at an angle to the displacement axis of the piston and lying in the same plane where the angular movement of the trigger lever takes place. The device includes a rocker lever which converts the angular movement of the trigger lever into a corresponding axial displacement of the delivery head to thereby drive the pump piston against the bias spring and produce the spray.

Abstract: A manually operated dispensing pump is provided for delivering a precise quantity of ophthalmic solution to the surface of the eye in a desired spray pattern with an impact pressure on the eye that is comfortably tolerable by an individual. The dispensing pump basically comprises a push button actuator having a nozzle member disposed therein, a cap member for receiving the push button actuator and having a control ring for selectively limiting the downward travel of the actuator, and a pump chamber engaged in the cap member and in communication with the push-button actuator for pressurizing a metered quantity of ophthalmic solution.

Abstract: The lower end of a first hollow vertical cylinder is connected to the upper end of a second vertical hollow cylinder of smaller diameter. A first outer hollow stem open at its ends has an intermediately disposed first external enlargement disposed below the top open end of the first cylinder. A hollow vertical main piston is vertically slidable within the first cylinder. A second inner stem has an upper vertical section which extends upwardly through the main piston and through a bore in the first stem. A vertical fluid discharge path is formed between the upper section and the first stem. An integral lower vertical section of the second stem engages the lower end of the main piston. A fluid discharge port is formed between the first section and the stem. A vertical inner piston is slidable in the second cylinder. A first spring normally biases the stems together, closing the discharge port. A second spring causes the discharge port to open during a selected point on the downstroke.

Abstract: A dispenser for use in dispensing a semi-solid material such as a paste, gel, ointment or the like, from a deformable tube, a particular application being for the dispensing of toothpaste. The product tube is screwed to the dispenser via the threaded throat and bears on one of two non-return valves to create an airtight seal. The tube is squeezed to prime the dispenser and fill the cavity. When a plunger assembly is pressed inward against a spring, product is displaced through the non-return valves and a dispensing nozzle. On release of plunger, the spring returns plunger to its original position and by vacuum action displaces an equivalent amount of product from the tube to replenish product in the dispenser cavity. The dispenser preferably has side flanges and projecting pins for the storage of toothbrushes.

Abstract: A valve for pumping a viscous fluid from a holding container includes a valve body having a fluid chamber, and a piston displaceable in the fluid chamber for pumping fluid from the fluid chamber through an outlet openings. The piston is attached to the end of a shaft which extends out of the valve. A hub with a plurality of openings and a resilient washer on its peripheral edge are slidably located on the shaft in the fluid chamber. When the piston is in contact with the hub it blocks the flow of fluid through the opening. When the hub is axially displaced from the piston, fluid is allowed to flow through the openings. Depression of the plunger causes movement of the piston away from the hub because of frontal engagement of the resilient washer with the walls of the fluid chamber. This allows the fluid to flow around the piston. Further movement of the shaft causes a projection on the shaft to engage the hub.

Abstract: A prior art precompression metering pump which incorporates a differential piston forming part of the pump chamber inlet valve and its outlet valve is difficult to prime, especially in the case of metering paste products. In the improved pump there is disposed between the differential piston and the main piston of the pump a collar consisting of a ring from which project substantially axial tongues which are slightly inwardly inclined and each provided with a head. The collar moves inside the pump body so that normal operation proceeds as if it were not present. To prime the pump, however, the user depresses the collar until it contacts a step on the pump body. The tongues then bend so that their heads, interposed between the two pistons, move the latter apart (by a wedging effect or by a lever arm effect, or by a combination of the two). This is followed by mechanical opening of the pump chamber outlet valve whereby the air initially contained in the pump chamber escapes to the exterior.

Abstract: A precompression pump for discharging a liquid in spray form has a first inner compression chamber formed within a pump body between a valve for closing an orifice through which liquid is withdrawn from a storage container and a discharge orifice through which the withdrawn liquid is expelled to a spray-discharge head. The volume of the first chamber is variable by means of a driving piston which is continuously urged by a first helical spring towards a position corresponding to the maximum volume. A second intermediate chamber is located between the first chamber and the discharge orifice, this orifice being shut-off by a needle-valve piston which forms the precompression system. The needle-valve piston is mounted within a moving element but outside the first chamber and urged by a second helical spring to a position of closure of the discharge orifice.

Abstract: A manually actuated, pressure build-up pump sprayer that is to be interconnected with a container for atomizing and spraying a liquid from the container. The pump sprayer includes air-tight seals and valves which are opened and closed at different portions of the stroke cycle, such that trapped air may be quickly compressed and efficiently blown from the poppet into the container and liquid from the container drawn into the poppet and sprayed from the spray head. Thus, the sprayer may be easily primed after only a few stroke cycles. The sprayer is characterized by a relatively reduced number of parts and manufacturing cost as well as the ability to prevent leakage and allow spraying of the liquid in the event that the container is tipped or turned over.

Abstract: An atomizing fluid dispenser has a pump chamber defined by a hollow vertical region defined by adjacent portions of interconnected upper and lower cylinders, a vertical member and a piston. The chamber has a first fluid entry port and a second fluid discharge port. The second port is opened and the first port is closed during a downstroke and the first port is opened and the second port is closed during an upstroke. Both ports are closed during periods of non use.

Abstract: A figurine-shaped toy squirts water out of its mouth by cranking an arm.

Abstract: A double acting trigger pump on a container includes a cylinder and a piston reciprocal therein that cooperate in providing a primary pump chamber. An inlet valve regulates product being drawn into the primary pump chamber. A double piston seal is at the inner end of the piston and includes an outlet valve coaxial with a longitudinal bore in the piston. A supplemental pump chamber that also communicates with the bore is defined between outer surfaces of the piston and inner surfaces of the cylinder as well as the double piston seal and a rearward retaining ring. During the pressure stroke of the piston, product is dispensed from the primary pump chamber out from the pump and fills the supplemental pump chamber. During the suction stroke of the piston, product is drawn into the primary pump chamber from the container and product is discharged from the supplemental pump chamber out from the pump.

Abstract: A dispenser for liquid germicide includes a container for germicide and an outlet, a metering device for metering a given amount of germicide to be dispensed from the outlet, a spout communicating with the metering device for dispensing metered germicide, and a timing arrangement coupled to the metering device for timed control of the frequency of dispensing the metered amount of germicide.

Abstract: An atomizing dispenser employs a vertical hollow elongated body with upper and lower ends and an orifice centered on the body axis and disposed between the upper and lower body ends. A hollow sleeve is disposed within the body with a relatively large open lower end and a relatively small open upper end and is vertically slidable. A vertically movable member has a lower enlarged section disposed within the sleeve and an upper section extending through the upper end of the sleeve. A vertically movable hollow piston has upper and lower open ends. The upper section of the member extends through the lower end of the piston into the piston interior; the lower end of the piston slidably engaging the inner surface of the upper body end.

Abstract: An apparatus for dispensing a measured amount of hydroscopic lubricant into an air conditioning system. The apparatus includes a container for the lubricant which has a key type coupling to a cylinder. The cylinder has a piston which may reciprocate therein. The piston has a bore therethrough so that the lubricant may pass from the container and through the piston, and thereafter, through a hose and into the air conditioning system. The container has a seal to protect the lubricant from moisture, the seal being interrupted when the cylinder is coupled to the container. The cylinder has driven pins extending outwardly therefrom and the cylinder also has a pair of diametrically opposed slots therein. The piston has a pair of diametrically opposed drive pins thereon arranged so that the piston drive pins communicate with the slots in the cylinders. A detachable leveraged handle having arms joined in a scissor fashion is provided.

Abstract: A vertical hollow body has a first upper hollow vertical cylinder and a second lower hollow outer vertical cylinder. A third inner hollow vertical cylinder is disposed concentrically within and spaced from the second cylinder. The lower ends of the first and second cylinders are joined. The upper end of the third cylinder has an aperture. A hollow piston is vertically movable within the first cylinder. A vertical member has an upper section extending into the piston interior, an enlarged middle section and a fourth vertical hollow cylinder as an enlarged lower section. The fourth cylinder has an inner shoulder at its upper end. A spring is disposed between and bears against the joined lower ends and the shoulder. A pump chamber is defined by a hollow vertical region bounded by adjacent portions of the body, member and piston and has a first fluid entry port and a second fluid discharge port.

Abstract: A liquid dispenser pump including a pump housing, a piston movable within the pump housing, a seal including a resilient wall disposed about the piston, and a reinforcement member for urging the resilient seal wall outwardly into fluid-tight engagement with the pump housing.

Abstract: A reciprocating pump for dispensing liquids from a container comprises a hollow body in which is slidably fitted a hollow piston. A piston seat is located in the body and provides a segment sized for sealing fit inside the hollow piston, thereby minimizing possible leakage through the pump when it is transported with a liquid filled container. Upper and lower valves are provided in the piston and body respectively. The piston seat is adapted to interact with the upper valve member to hold it open during a portion of an upward stroke of the piston thereby drawing any undispensed liquid back into the pump.

Abstract: A cylinder including an opening and inlet and outlet ports. A biasing member, within the cylinder, includes a first end fixed relative to the cylinder and a second end closer to the opening. A rotatable slidable member includes an angled first surface on which the biasing member second end is disposed, an opposite second surface closer to the opening and a variable width surface for closing the inlet port. A piston has arotatable rod and a flange surface which faces the second surface of the slidable member. On the piston rod is at least one hinging member. A protrusion fixed relative to the cylinder pushes the hinging member when the piston is moved so that this hinging member can close the outlet port. A plurality of these hinging members define an umbrella-shaped seal for losing the port at various rotational positions of the rod. An O-ring seal is disposed between both the piston flange surface and the slidable member second surface.

Abstract: A push up fluid dispenser having a fluid storage container and a vertically oriented plunger carried in the container, with the plunger being manually pushable upward for dispensing fluid from the container. The container includes a valve cylinder mounted in the container and having an upper opening and an interior passage for slidingly receiving the plunger, and the plunger having a fluid flow passage therein providing a flow path from the cylinder interior to the exterior of the dispenser. A first one-way valve is disposed for control of fluid flow into the cylinder interior through an upper opening and a second one-way valve is disposed for control of fluid flow from the cylinder interior into the plunger passage, with a spring between the cylinder and plunger urging the plunger downward.

Abstract: The pump comprises a chamber divided into a lower cavity occupied by the fluid and an upper cavity at atmospheric pressure. A flexible ring piston sealingly runs in the chamber and is inserted in a slidable way on a stem valve, with which it co-operates to enable or interrupt the outward flow of the fluid. The piston has a tapered section at its lower end, which engages by friction in a corresponding tapered groove of the stem valve to allow delivering of a fine mist with a very low delivery pressure also.

Abstract: An inexpensive, disposable trigger actuated pump in which the shroud and nose piece are molded as a single unit. In one form of the invention, the pump housing is molded as a single unit with the shroud and nose piece, and a trigger actuator and piston pump are also molded as a single unit for subsequent assembly with the shroud, housing and nose piece unit, return spring, nose valve, dip tube and container to form a completed pump. The trigger actuated pump of the invention thus comprises fewer parts than conventionally manufactured pumps, thereby reducing inventory requirements and assembly steps and consequently reducing the manufacturing costs, enabling the pump to be disposed of after the contents of the container are emptied.

Abstract: A valve for pumping fluid includes a valve body and a valve chamber in the valve body. The valve body has a first end with an entrance passage therethrough. The entrance passage communicates with the chamber to provide a passage for the flow of fluid through the container to the valve chamber. A plunger and a piston are provided. The piston is within the chamber and is connected to the plunger. The piston is moveable in the chamber in response to depression of the plunger. A seat is in the chamber as is a flexible washer. The flexible washer is adjacent to the piston and movable therewith. A biasing spring is provided in the valve body for biasing the washer against the seat. A spout is provided. An exit passage which extends between the spout and the chamber is provided and this exit passage is sealed by the washer when the washer is in the seated position. A normally closed check valve is between the chamber and the entrance passage.