Abstract: A foam dispensing pump container, for dispensing foam by mixing air pumped from an air cylinder by an air piston having suction holes in its upper wall and a foamable liquid pumped from a liquid cylinder by a liquid piston having an annular projection on its outer wall, provided with an elastic valve member including a cylindrical wall portion, an outer thin annular valve portion extending outwardly from the cylindrical wall portion, and an inner thin annular valve portion extending inwardly from the cylindrical wall portion.

Abstract: A drain flushing device for allowing a user to unclog a drain in either of two modes. The user is given the option to either use the device as a liquid column guide or as a pump.

Abstract: The present invention presents an improved pump piston for pressurizing liquid dispensing containers, and more particularly improved air inlet valve designs for such pistons. According to the present invention, the inlet valves are located remotely from the lower end of the pump piston, such that they are protected from contamination by liquid product and resulting degradation of performance. One inlet valve design utilizes a lost motion connection between the pump piston and upper cap, with structural elements of the upper cap and piston cooperating to form an inlet valve that is opened to admit air into the interior of the piston when the cap is pulled upward and tightly sealed when the cap is pushed downward. Another inlet valve design utilizes slits in the wall of the piston itself and the flexibility of the piston material to form an inlet valve that is opened to admit air into the interior of the piston when the cap is pulled upward and tightly sealed when the cap is pushed downward.

Abstract: The invention is a water well surge block for agitation of particles in water wells. The surge block utilizes a novel one way valve comprising a shaft in connection with a rigid perforated cylinder having an upper and lower surface and a flexible membrane that overlies the upper surface of the membrane. As the surge block moves downward in the well or wellbore the membrane flexes away from said cylinder during downward movement of the block in order to permit the one way flow of fluid upward. The membrane closes against the cylinder to prevent the flow of water as the block moves upward.

Abstract: A disposable plastic pump for dispensing liquids is disclosed which comprises two basic unitary, preferably all plastic, elements: a chamber forming body having an open outer end and an inner end in fluid communication with a liquid reservoir, and a piston formed to slidably fit into the chamber. The chamber forms two axially adjacent coaxial chambers, an inner chamber of one diameter and an outer chamber of a greater diameter. The piston comprises a stem on which is located two spaced flexing disc each sized to fit in and serving as a one-way valve in the inner chamber and outer chamber, respectively, permitting fluids to flow outwardly past each flexing disc. A sealing disc is located on the stem outwardly of the outermost flexing disc. A passageway is provided from an inlet on the piston between the outermost flexing disc and the sealing disc through which the dispensed liquid flow.

Abstract: A compressor assembly is disclosed including a compressor mechanism mounted within a hermetically sealed housing. A cylinder block contains a reciprocating piston in which the piston includes a suction valve assembly and an annular rim that substantially completely fills the discharge port when the piston is at top dead center position, to reduce re-expansion volume. The cylinder head assembly is attached directly to the cylinder block with no intermediate gasket therebetween, permitting coplanar seating of the discharge valve with a correspondingly larger discharge valve seat perimeter permitting faster valve closure and lower pressure loss through the discharge port.

Abstract: Suction and/or discharge valves are provided in a metering and spray pump for liquid or low-viscosity, especially pasty substances, in which two housing parts, which are telescopingly movable relative to one another and are made of a dimensionally stable plastic, have a pump chamber, whose volume can be cyclically altered by a pump member. To provide a valve which can be used both as a suction valve and as a discharge valve and consists of the simplest possible functional parts that can easily be assembled and operate reliably even in the case of relatively wide dimensional tolerances, and which especially has a good quality of closing at low opening force, which can be tested even in the dry state, e.g.

Abstract: Product admission into the working chamber 23 of a precompression pump is accelerated by providing a differential piston 4 with a bore 63 which establishes communication between the inside of a skirt 42 and a shoulder 44. A cylindrical sealing element 60 is fitted over a spindle 41 to be applied against the shoulder 44, level with two annular contacts 64, 65 between which the bore terminates. The sealing element closes the bore on discharge of the precompressed product dose. The sealing element is configured such that, particularly when the pump is idle, it is kept deformed and is therefore applied to the shoulder 44 with sufficient force to guarantee the seal of the two annular contacts 64, 65.

Abstract: A scotch yoke compressor including a valve system wherein an annular discharge port is defined by an opening in the valve plate and a washer attached to the cylinder head. A valved piston includes a valve retainer having an annular protuberance that extends above the piston head and is received within the annular discharge port when the piston is at top dead center, thereby reducing reexpansion volume.

Abstract: A flexible valve retainer for a piston and suction valve assembly of a reciprocating piston hermetic compressor assembly. In the compressor assembly, the suction valve opens as a result of the fluid pressure generated by the reciprocating movement of the piston in the cylinder. As it opens, the suction valve is axially displaced from a closed position on the top surface of the piston to an open position a fixed distance therefrom, whereupon further axial movement is prevented as the suction valve strikes the valve retainer. The radially outer portion of the valve retainer deflects as a result of the impact with the suction valve. This deflection of the valve retainer lessens the detrimental effects caused by repeated impact between the suction valve and retainer. The valve retainer is formed from a flexible material such as spring steel or Swedish steel. The valve retainer comprises at least one washer coaxial with the suction valve, and spaced said fixed distance therefrom.

Abstract: A disposable plastic pump for dispensing liquids is disclosed which comprises three basic unitary all plastic elements: a chamber forming body having an open outer end and an inner end in fluid communication with a liquid reservoir, a one-way valve located at the inner end of the chamber between the reservoir and the chamber permitting fluid flow only from the reservoir into the chamber, and a piston formed to slidably fit into the chamber. The piston comprises a stem on which is located an inwardly located flexing element serving as a one-way valve to permit fluid flow outwardly past the flexing element and a sealing element located outwardly of the flexing element. A channel is provided from an inlet on the piston between the flexing element and the sealing element through which the dispensed liquid flows.

Abstract: A swash plate compressor is disclosed having double acting pistons that reciprocate in aligned sets of horizontally extending bores of a cylinder block to compress gaseous refrigerant. An improved asymmetrical arrangement of suction or intake ports is provided in at least the bottommost piston. The ports extend longitudinally through the operating heads of the piston and are connected by an open channel so as to provide fluid communication through the piston. A matching valve disc with a flexible ring is included so as to provide unidirectional flow through the suction ports during the intake stroke. The suction ports are on a constant radius arc spaced 30.degree. apart and are excluded from the lower 120.degree. portion of the piston to form the asymmetrical arrangement. Liquid lubricant in the reservoir pool adjacent the bottom of the crankcase is sufficiently spaced from the ports so that it is prevented from being drawn through the suction ports and into the cylinder bore, thus eliminating slugging.

Abstract: A compressor asssembly, with particular reference to the suction side thereof, for a gas compressor having one or more cylinders, pistons mounted for reciprocation in the cylinders, cylinder head means mounted over the ends of the cylinders to provide discharge chambers, refrigerant discharge valve elements intermediate the head means and cylinders and providing compression chambers and adapted to open discharge passages to the discharge chambers for pressurized gas on the compression strokes of the pistons and to close the discharge passages on the suction strokes of the pistons, first suction gas inlet passages through the walls of the cylinders at positions remote from the cylinder head means, second suction gas inlet passages in the pistons extending through the outer walls thereof and in communication with the first passages over at least substantial portions of the travels of the pistons, suction gas ports in the tops of the pistons in communication with the second passages, the ports having port seats

Abstract: The present invention is a retainer for a piston and valve subassembly of a scotch yoke compressor and a method of assembling it. The subassembly is comprised of a piston head, a suction valve, a spacer, a stop washer, and a rod held together by a retainer. The suction valve is assembled on the rod, then the rod is inserted into the piston head. Next the retainer is installed on an end of the rod for frictionally engaging the piston and rod, thus axially securing the suction valve and the rest of the piston head subassembly during assembly to the yoke.

Abstract: A hand pump having a cylinder and piston in which the piston head is formed with an annular channel having an opening in the base of the annular channel in free communication with the interior of a hollow piston rod. A pair of radially-projecting stops extend outwardly from the base of the channel adjacent the opening. A pair of O-rings are positioned within the channel with one on either side of the stops with the O-rings having an inner diameter closely fitting the surface of the base and an outer diameter when in an unstressed position engage in a sliding relation the inner surface of the cylinder. Chambers are formed on either end of the piston head and are provided with valve inlets.

Abstract: Refrigerant compressor construction having a cylinder, a piston mounted for reciprocation in the cylinder, a cylinder head mounted over the end of the cylinder to provide a compression chamber, and refrigerant discharge valving in the cylinder head or a valve plate assembled thereto adapted to open a discharge passage for pressurized refrigerant on the compression stroke of the piston means and to close the discharge passage on the suction stroke of the piston, a first suction gas inlet passage through the wall of the cylinder at a position remote from the cylinder head, a second suction gas inlet passage in the piston extending through the outer wall thereof and in continuous communication with the first passage, a suction gas port in the top of the piston in communication with the second passage, the port having a valve seat formed in the top of the piston and a valve disc mounted on the top of the piston for limited axial, floating movement and having a sealing surface adapted to bear against the valve sea

Abstract: A precompression metering pump of the prior art which is otherwise particularly advantageous, is nevertheless difficult to prime because of the high degree of compressibility of the air it initially contains in its pump chamber. The present invention improves this aspect of metering pump operations. It consists in providing additional resilient means (20) and at least one cylindrical part (10) level with the conventional outlet non-return valve of the pump and constituting a second outlet non-return valve. In a particular embodiment, the resilient means and the cylindrical part are received one above the other in the outlet channel (33) of the pump actuator rod (31). To do this, they bear respectively against a choking step (32) in the form of a lug and a shoulder (34) presented by said channel. In normal operation, the differential piston (4) of the pump moves out of the way so that operation takes place as in a prior art precompression metering pump.

Abstract: A free piston to be slidably inserted in the cylinder of an electromagnetic reciprocating compressor. The piston has a partition wall dividing the inner space of the cylinder into chambers, and a rod connected to the partition wall. The partition wall has an air hole. A valve member is attached to the front surface of the partition wall, and usually closes the air hole of the partition wall. The rod extends rearwardly from the rear-end surface of the partition wall. The rod has a substantially conical hole which extends rearwardly from the front-end surface of the partition wall. The piston further comprises a retainer cap closing the opening of the substantially conical hole and holding the valve member in an openable condition.

Abstract: A dosing or atomizing pump for liquid, creamy or pasty media has, in addition to its outlet valve provided on the pump chamber an additional valve provided in the pump operating pushbutton and closes the discharge opening directly at its mouth. By means of the hydraulic pressure, the additional valve body is operated by means of a differential piston. In a variant, the valve body can be a functional part of an atomizer nozzle. The additional valve prevents drying or other negative influencing of the medium in the discharge passage.

Abstract: A valve assembly (16) for an oscillating pump (10) of the type having a reciprocating armature (12) which carries an impeller (13) includes a rigid valve seat (17) carried by and movable with the impeller (13). The assembly (16) also includes an elastomeric valve (18) which is carried by the valve seat (17) within the impeller (13) and which divides the pump chamber therein into an inlet side (14) and outlet side (15). Reciprocation of the armature (12) first causes the valve (18) to engage the valve seat (17) to discharge fluid from the outlet side (15) of the pump chamber and then causes the valve (18) to disengage the valve seat (17) to permit fluid to pass from the inlet side (14) to the outlet side (15) of the pump chamber.

Abstract: An apparatus for transferring a fluid medium comprises a housing (1) having an interior (4) in the top portion (2) thereof communicating through selector valves (5,9) with the atmosphere and with an intake line (6), the bottom portion 3) of the housing (1) accommodating an actuator 13) capable of reciprocations relative this bottom portion of the housing and blocking its cross-section, the actuator (13) having a non-return valve to communicate a tank (12) containing the fluid medium with the interior of the housing 1) at the top portion (2) thereof.

Abstract: A bore hole pump which eliminates the need for a piston sealingly engaging with the walls of the pump body. The pump comprises a hollow body closed at its lower end by a non-return inlet valve and slidably and sealingly supporting at its upper end, via a seal, a reciprocating riser pipe which is likewise closed at its lower end by a non-return valve. Upward movement of the riser pipe causes fluid to be drawn into the pump body via inlet valve while downward movement of the riser pipe causes fluid to be expelled from the pump body via outlet valve.

Abstract: A thrust piston pump for the delivery of media has a spring constructed in one piece with the piston rod of a piston unit and located in the pump chamber, which is guided on a sloping surface formed by an internal cone. The piston rod is constructed in such a way that an axially resiliently compressible, sleeve-like piston collar can be fitted from the outer end of the piston rod. The fastening cap can be constructed in one piece with a flange edge, a ring packing and/or a component of the cylinder casing, particularly its cylinder cover. This leads to high pump reliability, in the case of simple construction and easy assembly.

Abstract: A well pump includes a piston and an inlet and/or outlet valve assembly of special structure. Each is formed of a body of organic polymer, preferably PTFE. Each includes a cavity in its upper portion and at least one passage leading from the cavity to the bottom of the block. A screen covers each cavity and a valve disk covers each screen. Flexible sealing flanges extend upwardly and downwardly from the periphery of the piston block. The outlet valve block has a sliding block and sealing fit with the piston rod.

Abstract: Apparatus for injecting flowable material in which a container holds flowable material. Disposed within the container is a plunger which is formed with metering apertures extending therethrough. The metering apertures store predetermined quantities of material to be mixed with the material in the container. A flexible member is disposed adjacent the plunger between the discharge opening of the container and the plunger. When the plunger travels away from the discharge opening, the flexible member unseals the metering apertures for mixing the material in the plunger with the material in the container. When the plunger travels toward the discharge opening, the flexible member seals the metering apertures in the plunger to discharge the mixed material in the container through the discharge opening.

Abstract: Apparatus suitable for employment in the burping of a water bed comprisesa screw thread or bayonet in the burping and/or filling opening of a waterbed having a removable cap, andair withdrawal means capable of withdrawing air and/or liquid from the waterbed having a cooperating element engageable with the fitting.The method of burping a waterbed comprisesremoving the cap of the fitting in the filling apparatus of a waterbed without substantial loss of liquid therefrom,attaching an air withdrawal device to the fitting about the opening from which the cap has been removed,actuating the air withdrawal device to withdraw air from the bed (with or without lifting of the region of the bag about the fitting to which the apparatus has been attached) and,detaching the air withdrawal device from the fitting when the fitting is positioned so as to minimize the risk of entry of air into the bag and, thereafter refitting the cap to the fitting.

Abstract: An evacuating pump has a hollow cylindrical body, a cap at one end of the body, and a nozzle at the opposite end. A plunger disposed within the body has a piston attached to an inner end of a reciprocating rod, while the outer end of the rod extends through a bore provided in the cap. When the plunger is withdrawn, a vacuum is created at the nozzle, while on the inward stroke, a check valve flap seats over the nozzle inlet to prevent air from being injected through the nozzle. Air being compressed on the inward stroke escapes around the peripheral edge of the piston.

Abstract: There is provided a proportioning system for mixture of the fluid to a liquid-carrying main line in a substantially constant, presettable proportion to the flow rate of the liquid in the main line. The system comprises pump means for drawing a quantity of fluid from a vessel and for injecting the quantity into the main line, pump-drive means impactable by the main-line liquid for driving the pump means, flowmeter means for monitoring the instantaneous flow rate of the main line and converting the flow rate into a flow-rate proportional rotary motion of an output member of a flowmeter means.

Abstract: A method of assembling a reciprocating compressor, in which a piston for partitioning a cylinder into a compression chamber and a suction chamber is telescoped in the cylinder, a closure end plate is secured at an open end of the cylinder, the end surface of the piston and the bottom surface of the end plate define opposing sides of the compression chamber, the piston is perforated by a suction port for communicating between the compression chamber and the suction chamber, and a suction valve sits on the piston for opening and closing the suction port, comprising the following steps; (1) manufacturing in advance a plurality of closure end plate, the i-th end plate having a bottom surface formed by a projection of different height h.sub.i ; (2) defining two reference positions of the piston and cylinder, respectively, for the i-th compressor and measuring the interval D.sub.i between the reference positions; (3) selecting an end plate which has a projection of such a height that D.sub.i -h.sub.

Abstract: A reciprocating, preferably a piston-type, exhauster adapted for mounting on an engine crankcase and having, on opposite sides of the piston, a high clearance volume inlet chamber and a low clearance volume exhaust chamber. The piston is operated by an engine driven cam acting on the piston rod which passes through the exhaust chamber and moves against a return spring in the inlet chamber. As the piston moves in the cylinder air is drawn from the inlet chamber through a non-return valve in the piston to the exhaust chamber and then is discharged directly into the engine crankcase.

Abstract: A low cost electromagnetic fluid pump having molded structural plastic housing components, a biased reciprocating hollow piston, and a pair of plastic flapper valves providing for a unidirectional fluid flow is disclosed. An integrated circuit timer periodically energizes a solenoid coil producing an oscillating magnetic field reciprocating the piston.

Abstract: An air pump comprising a piston located inside a piston housing having a crown and an open end. The piston is provided with a pressure generating member in the form of a resilient membrane-like annular disc which is held centrally on one end of the piston, which is fitted in the piston housing with the annular disc and the piston plate pointed towards the crown of the piston housing whereby the rim of the membrane-like annular disc bears against the inner wall of the piston housing and the piston housing is guided on the piston in a manner enabling it to be moved axially.

Abstract: A hand-actuatable pump assembly is adapted to be sealingly secured to the mouth of a container for dispensing material in the container. The pump assembly includes a generally tubular adapter that defines a discharge passageway. A spray member is seated on the adapter and defines a discharge opening in communication with the passageway. A stem defines a tubular portion that is secured to the adapter. A valve body defines a pressure chamber. A piston sealingly and slidably engages the wall of the valve body. The piston comprises a first portion that is clamped between the stem and the adapter, and a second deflectable portion in sealing engagement in a position of rest with the stem, and being out of sealing engagement with the stem in a second position of actuation. The deflectable portion of the piston is deflectable in response to hydraulic pressure upon movement of said piston downwardly into the valve body to expose the passageway to communication with the pressure chamber.

Abstract: A positive displacement liquid pump having a free-moving weight mass spaced from and oscillatably positioned concentrically within a cylindrical housing is disclosed. A pair of cooperating one-way valves, one valve communicating with a central passage defined by the weight mass while the other valve communicates with an inlet to the housing, coact to draw in fluid or liquid from a supply source. As the oscillatable weight mass moves away from the inlet, the one-way inlet valve opens, filling a chamber behind the weight mass. The one-way valve in the weight mass simultaneously closes enabling the weight mass to drive fluid out of the reservoir chamber at an exit end of the housing, the valves acting oppositely when the weight mass oscillates back toward the housing inlet. The free-moving weight mass suspended within the pump housing is set in motion by the oscillatory motion of a vibration source without direct mechanical actuation of the device from a power source.

Abstract: A hand carried, motor driven pump which will pump at high or low pressure, depending upon the size of the plunger used. The pump is used for high pressure lubricant, up to 9,000 lbs., to a high volume of fluid, such as Diesel oil, water and the like at low pressure. The pump is used in practically all industries in which machinery is to be lubricated by grease under high pressure and where liquids need to be transferred or pumped from one container to another. The present pump is particularly adaptable for use on heavy agricultural machinery, where portability is essential.

Abstract: An apparatus for producing and dispensing an aerated frozen confection in which a pump is mounted in the liquid ingredients reservoir of the apparatus and operates to pump a mixture of air and liquid ingredients, in selected proportions, to the freezer compartment of the apparatus. The pump itself is responsive to pressure within the freezer compartment to regulate the volume of mixture supplied to the freezer compartment by the pump for enabling automatic replenishment of the aerated mix in the freezer compartment. The pump includes a plunger projecting into the freezer compartment and driven by a cam which rotates with an agitator in the freezer compartment to move the plunger against the bias of a spring in the pump so as to reciprocate the plunger until the pressure within the compartment is great enough to move the plunger away from the cam, against the bias of the spring, thereby discontinuing the supply of mix to the freezer compartment.

Abstract: A spray pump comprises a pump cylinder defining a pump chamber, a piston which is movable in the chamber, an actuating push button arranged to move the piston in the chamber, and an atomization nozzle arranged to receive liquid from the said chamber. A liquid outlet valve is located between the pump chamber and the atomization nozzle. The outlet valve comprises a valve body received in and surrounded by a tubular portion, the valve having a closed position in which tubular portion lies against the valve body and an open position in which the tubular portion is elastically widened to allow liquid to pass between the valve body and the tubular portion. The valve further comprising a stop for holding the valve body in the tubular portion.

Abstract: A spray gun for spraying of liquids utilizing compressed air includes a molded casing which contains within a sealed pressurized portion thereof, an electric motor and an air compressor driven by it. A manual trigger sequentially controls an electric switch for the motor and a needle valve for the discharge nozzle such that the motor and compressor are started before liquid is admitted to the nozzle, and are operated after liquid flow to the nozzle has been terminated. A diaphragm-type inlet check valve communicates with a pressure chamber of variable size forming a part of the air compressor, a second diaphragm providing both the movable wall of the pressure chamber as well as the movable element of an outlet check valve built therein which conducts pressurized air into the pressurized portion of the casing, passing across the motor enroute to the nozzle.

Abstract: An air compressor has a low torque motor driven piston of the rocking rod type which operates in a cylinder with a closed head containing a discharge check valved port to a compressed air receiving chamber. The piston contains an intake port provided with a thin flexible metal spring closure strip which is inclined at a small angle to the valve seat about said intake port to open on the downstroke of the piston, close on the upstroke thereof and remain open when at rest to facilitate start and restart of the air compressor.

Abstract: In the construction of an electro-magnetic fluid pump such as an air pump in which a piston assembly carrying an armature is driven for reciprocal axial movement due to operational combination of magnetic attraction generated by a stator core and mechanical spring repulsion for cyclic discharge of the fluid out of its piston chamber, the piston assembly is postively supported on both axial sides of the stator core and a pneumatic spring is incorporated within the piston assembly. Biased movement of the piston assembly and bias in the magnetic attraction are both successfully prevented in order to minimize undesirable abrasion of the piston assembly and its related parts.

Abstract: A pump has a reciprocably driven rod disposed in a quantity of fluid to be pumped, there being an outlet from the fluid chamber. A pair of elements respectively disposed at the outlet opening and on the end of the rod are separable and jointly define a pumping cavity which is filled when the elements are separated. When the elements are brought together, pumping is achieved in that one of the elements is yieldably compressible so as to reduce the size of the pumping cavity to force out a drop of fluid. A stirrer is disposed near the above-mentioned elements, and reciprocatory motion of the rod is transferred to a one-way clutch to provide incremental rotation of the stirrer.

Abstract: An improved, hand actuatable pump assembly. A stem and piston assembly extend into a valve body. The piston sealingly engages the wall of the valve body and together they define a pressure chamber therebelow. The piston seals a discharge passageway in the stem. As the pump assembly is primed, air in the pressure chamber escapes through the discharge passageway. When the pump is ready for use, the force of hydraulic pressure below the piston opens communication between the pressure chamber and passageway. When the piston nears the end of the stroke, it is mechanically held open to complete dispensing. At all times, a positive seal between the piston and the valve body wall is maintained to prevent passage of the contents of the pressure chamber therebetween, thereby to minimize sticking and clogging of the pump assembly.

Abstract: An improved two-cycle internal combustion engine with a novel intake, exhaust and piston arrangement in which a fresh charge for combustion component is advantageously transferred through the piston and all valves in the engine operate in response to changes in dynamic pressure generated within the engine. The piston includes at least one charging passage through its top surface with a pressure sensitive valve affixed to the top surface of the piston for preventing flow of a fresh charge through the charging passage in the absence of a greater pressure differential caused by the intake charge against the undersurface of the pressure sensitive valve.

Abstract: An improved two-cycle internal combustion engine with a novel intake, exhaust and piston arrangement in which a fresh charge for combustion is advantageously transferred through the piston and all valves in the engine operate in response to changes in dynamic pressure generated within the engine. The piston includes at least one charging passage through its top surface with a pressure sensitive valve affixed to the top surface of the piston for preventing flow of a fresh charge through the charging passage in the absence of a greater pressure differential caused by the intake charge against the undersurface of the pressure sensitive valve.

Abstract: The vertical hollow sleeve of a pump has a bottom open end receiving the top open end of a container with fluid. A top section of the sleeve has a first vertical bore with a bottom surface communicating with the bottom thereof and contoured to receive a convex diaphram. A hollow vertical extension slidably disposed in the first bore has a second vertical bore with a top disposed first orifice. The tip of a vertical member slidably disposed in the first bore fits movably into the first orifice. A mechanism engaging the extension and bottom surface has a horizontal chamber which in vertical cross section has the shape of a horizontally elongated axis. The diaphram forms the top surface of the chamber. The bottom surface of the chamber is formed by the rigid top end of a vertical cylinder which has a third vertical bore receiving the member. The member has a fourth vertical bore which communicates with an enlarged hollow region in the chamber.

Abstract: A finger-operated spray pump assembly including a compression chamber, a generally cylindrical valve slidably fitted inside the compression chamber, a piston slidably fitted inside the valve, and a spring fitted inside of the valve for urging the piston away from the bottom end of the valve.

Abstract: A small high speed direct connected motor compressor has a unitary piston and piston rod whereby the piston wobbles in the cylinder as the crank shaft rotates. The wobbling piston is sealed to the cylinder by a flanged disk of Teflon which forms both a seal and mechanical guide for the piston and which runs without lubrication in contact with a low-friction, surface-coated cylinder of high heat conductivity. The circular rim of the Teflon cup is warped from circular outline to elliptical outline twice per revolution while maintaining its seal with the walls of the cylinder. The structure involves small clearance spaces with consequent good efficiency.

Abstract: A pump primarily intended for incorporation in a dip-tube sprayer includes a hollow piston slidable in a cylinder which communicates with an outlet tube. The piston defines a seat for a valve which in the inoperative condition prevents communication between the cylinder and the outlet or delivery tube. The piston has the form of a shallow cup and is not totally covered by the valve when seated. One or more bleeds are provided in the part of the piston covered by the valve.

Abstract: A drill comprising a body means having an axial, generally cylindrical, interior space is provided with a first cylindrical piston axially slidable between a first and a second position within the cylindrical space. The piston is provided with an extension in the form of a second piston, and the first and second piston surround an axially disposed flushing tube, which with the piston defines a first annular oiling space. The flushing tube, the first piston and the body define a second annular oiling space, while the flushing tube, the second piston and the body define an annular pumping zone. A source of lubricating fluid communicates with the pumping zone by means of the body inlet as the first piston is moving towards said first slidable position, and the pumping zone communicates with the second annular oiling space by means of the first annular oiling space as the first piston is moving towards said second slidable position. The first annular oiling space and the inlet are provided with one-way valve.

Abstract: A diaphragm compressor includes a cylindrical piston and an annular diaphragm member with a central hub secured by a grommet within an annular recess in the piston face. The outer peripheral edge of the diaphragm is affixed between a clamp ring and a valve plate which has a central recess to form a compression chamber. The diaphragm has a convolution which opens toward the compression chamber. The valve plate has a projection complementing and mating with the convolution. A plurality of circumferentially spaced and radial intake ports lead to an annular piston intake opening inwardly of the diaphragm. A flexible, tee-shaped valve member includes a stem locked within the piston with a planar sealing disc having an outer bead abutting the inner piston face and overlying the intake opening. The stem may pass through a central opening with an outer stem enlargement creating a resilient clamping of the valve member to a holding portion of the piston.