Abstract: A reciprocating piston with an integral valve moves in a first direction within a cylinder to pressurize viscous material contained therein, such as ice cream or the like, thereby pushing it out of a dispensing nozzle located at one end of the cylinder while simultaneously extracting viscous material from a collapsible container into the other end of the cylinder by suctioning the material from the container. When the piston moves in a second direction, the integral valve opens to allow the piston to pass through the previously suctioned viscous material then within the cylinder. The dispensing nozzle includes a normally closed, spring-biased valve opened by the force of the pressurized material, closing of the valve being assisted by a transient suction force occurring as the valved piston begins to move in the second direction through the material.

Abstract: An apparatus for applying mastic to a selected surface includes a container for mastic, a pump assembly, and a drywall tool or wand. The pump assembly is positioned in the container so that it draws mastic from the container and delivers it to the drywall tool. The mastic delivered to the drywall tool is applied to the selected surface through a nozzle in the drywall tool. The pump assembly includes a pump, a pneumatic cylinder, and a linking subassembly connecting the pump and the pneumatic cylinder. The pump assembly is operated by an air compressor. The air compressor causes a rod in the pneumatic cylinder to reciprocate. The linking subassembly translates this reciprocation to a piston in the pump assembly. The piston reciprocates within a bore of the pump assembly and draws the mastic from the container. The apparatus is mounted on a hand truck so that it may be moved to different locations.

Abstract: A liquid pump comprises an insulated cylinder which is provided with a top seat and a bottom seat. The top seat is provided with a liquid inlet while the bottom seat is provided with a liquid outlet. A piston rod is fastened with the top seat and is provided at the bottom thereof with a one-way piston valve device capable of creating a vacuum in an upper chamber of the cylinder. The bottom seat comprises a receiving space in which a one-way valve device is disposed. The liquid contained in a vessel is drawn up by suction via the liquid inlet. The liquid so drawn up is discharged via the liquid outlet.

Abstract: A hand pump includes a housing having two chambers communicated with each other. An attachment member is secured to the front portion of the housing. A piston is slidably engaged in one of the chambers and includes two annular grooves for receiving two sealing rings. A piston rod has one end secured to the piston and has the other end extended outward of the housing. The piston may pump the air in front of the piston into the attachment member when the piston moves forward, and the air in the rear portion of the piston may be pumped into the attachment member via the other chamber.

Abstract: A reciprocating piston with an integral valve moves in a first direction within a cylinder to pressurize viscous material contained therein, such as ice cream or the like, thereby pushing it out of a dispensing nozzle located at one end of the cylinder while simultaneously extracting viscous material from a collapsible container into the other end of the cylinder by suctioning the material from the container. When the piston moves in a second direction, the integral valve opens to allow the piston to pass through the previously suctioned viscous material then within the cylinder. The dispensing nozzle includes a normally closed, spring-biased valve opened by the force of the pressurized material, closing of the valve being assisted by a transient suction force occurring as the valved piston begins to move in the second direction through the material.

Abstract: A compressor assembly is disclosed including a compressor mechanism mounted within a hermetically sealed housing. A cylinder block contains a reciprocating piston having a suction valve assembly. The piston includes a head with a deep semitorus shaped annular groove with a similarly shaped solid suction valve that seats thereto. A retaining mechanism including a clamping bolt with a plurality of radially extending fingers is used to reduce valve inertia and impact forces. The fingers behave as cantilevered beam springs.

Abstract: A manual pump which has a plunger and a cylinder. The cylinder defines a nozzle through a first end and an opening through a second end. A groove is circumferentially defined in an internal surface of the cylinder near the opening. Two slots are defined in a stem. The plunger has a stem and a piston which is formed at the first end of the stem. A knob is formed at the second end of the stem. The piston has first and second disks spaced from each other. A plurality of holes are defined through the first disk of the piston. A sealing ring is mounted between the first and second disks of the piston. An annular limit consists of two semi-annular halves between which the stem is inserted. Each semi-annular half has a semi-annular flange formed thereon in order to be engaged in the groove defined in the cylinder so that the annular limit is attached in the cylinder so as to retain the piston in the cylinder. A tab projects from the underside of each semi-annular half of the annular limit.

Abstract: An air pump piston is provided peripherally with a first leakproof ring and a second leakproof ring, which are located respectively and contiguously at both ends of the piston. Located peripherally between the first and the second leakproof rings is a radially disposed air hole. The piston is fastened at the second end thereof with a piston rod such that the air hole of the piston is in communication with an axial passageway of the piston rod. The piston is further provided peripherally between the first leakproof ring and the air hole with at least one first duct disposed radially. The piston is still further provided peripherally with at least one second duct which is disposed radially and located between the second leakproof ring and the air hole. The piston is provided at the first end thereof with an air admitting hole in communication with the first duct. The piston is provided at the second end thereof with an air duct in communication with the second duct.

Abstract: An air pump comprises a head; an air guiding tube fastened at one end thereof with the head and at another end thereof with a two-way air admitting piston; a first cylinder fitted over the two-way air admitting piston such that the first cylinder can be caused to move back and forth; a first one-way valve disposed in the anterior end of the first cylinder; a second piston disposed in another end of the first cylinder; a first one-way valve permitting air to enter only the first cylinder; a second cylinder fitted movably over the second piston; and a second one-way valve disposed in the second cylinder to permit air to enter only the second cylinder which is fastened with the first cylinder without being able to move in relation to the first cylinder.

Abstract: This invention relates to a vacuum container and in particular to one including an inner container, an outer container receiving said inner container, a lid provided with a packing formed with an outer annular groove for receiving an upper rim of said outer container and an inner annular groove for receiving an upper rim of said inner container, a check valve mounted on a central portion of said lid, a control valve composed of two one-way valves, and a vacuum extractor including a sleeve and a seat engaged with the lower end of said sleeve, said sleeve being a tubular member in which is inserted a piston, said piston having a lower end formed with an upper flange and a lower flange between which is fitted a leak-proof gasket, said upper flange being formed with a pair of exhaust openings.

Abstract: A fluid feed pump which prevents fluid from leaking or flowing back from a discharging side section into a suction side section when fluid sucked into the pump from the suction side section is to be fed into the discharging side section is disclosed. When a piston in a cylinder moves in a sucking/discharging direction, fluid flows into an inlet port side section in the inside of the cylinder through an inlet port while the inlet port side section and an outlet port side section of the inside of the cylinder are separated in an axial direction by a tubular enclosing member. Thereupon, since a lower portion of the tubular enclosing member is expanded in a radial direction to contact an outer circumferential face thereof in a water-tight condition with the inner face of the cylinder, the inlet and outlet port side sections of the cylinder are isolated in a high sealing condition from each other.

Abstract: An evacuation system for unlidded rigid containers including a reciprocating piston pump and a universal disc that provides a leak proof lid for ordinary pots, pans or bowls. The disc is flat and accommodates a variety of container sizes as well as minor surface irregularities in the container lip. Vent holes spaced around the perimeter of the disc prevent implosion of the disc into the container if the disc edge is placed too close to the edge of the container. The disc is somewhat flexible and has a sealing surface on one side for proper seating and sealing on the container lip.

Abstract: An improved evacuation pump system uniquely designed to evacuate both lidded rigid containers and sealable flexible containers. A vacuum cup fixed to one end of a reciprocating piston pump attaches to the lid of rigid containers for their evacuation and a flexible probe connects to the pump for flexible container evacuation. To achieve this dual function a inlet passage in the pump has a cross bore that slidably and/or rotatably receives a two position valve that selectively connects the pumping chamber with two outlets, one associated with each mode. The flexible probe connects directly to this valve reducing the need for separate passageways.

Abstract: An improved evacuation pump system with dual inlet check valves uniquely designed to evacuate both lidded rigid containers and sealable flexible containers. A vacuum cup fixed to one end of a reciprocating piston pump attaches to the lid of rigid containers for their evacuation and a flexible probe connects to the pump for flexible container evacuation. To achieve this dual function two check valves mounted in the lower end of the pump are provided for the flexible container evacuation mode. One prevents discharge flow into the flexible probe and the other maintains suction in the cup to keep the pump attached to its supporting surface.

Abstract: A new pump or injection apparatus is adapted to be connected between a pipe and a valve and is adapted to either pump well fluids from a wellbore or inject fluids into a formation traversed by the wellbore. The valve includes a full bore passage and a surrounding inlet flow channel.

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 gas jet shooting device for use with a non-contact tonometer, having a hollow head (19) with a nozzle (27) secured thereto, a cylinder (10) which communicates with the head, and a piston (11) reciprocatably mounted in the cylinder and defining a compression chamber (14) in the cylinder, and a linear d.c. motor (31) for driving the piston (11) for compressing the gas in the cylinder (10), the compressed gas being allowed to issue through the nozzle. The cylinder (10) is fed with the gas through a passage which opens into the chamber (14) and which does not include the nozzle. The gas may be air, and drawn into or pushed into the chamber through a filter (F). It may also be a gas other than air, harmless to the eye, supplied from a reservoir through a filter. Such arrangement ensures that air-born dust or tear drops scattered by the air jet will not be drawn into the chamber, and the device can therefore be maintained hygienic.

Abstract: A universal plunger for oil well pumps, which universal plunger includes a symmetrical plunger body having a longitudinal bore, a pair of threaded flange nipples projecting from end flanges located on each end of the plunger body, a pair of spaced O-ring seats provided inwardly of the end flanges, respectively, the O-rings seated in the O-ring seats, a plunger body segment of reduced diameter extending between the inner sets of O-rings and a "Teflon"-hydrocarbon composition disposed between the spaced inside O-rings, the plunger body segment and that portion of the inside surface of the oil well pump barrel which faces the plunger body segment, for sealing and lubricating the universal plunger in the pump barrel.

Abstract: A sampling pump is provided suitable for pumping a discrete quantity of either a liquid or a gas per pump stroke from a flow line to a sample vessel. An operator unit drives a piston within the pump bore, and controls the stroke of the piston and thus the quantity of fluid pumped per stroke. A balanced check valve mechanism controls flow from the pump bore to the pump outlet port, and is provided within and carried by the piston. Line pressure acts on the operator end of the piston to assist the operator in driving the piston during its power stroke. A manifold may be secured to the pump body, and has a flow path therein which is in communication with the inlet port to the pump bore. The pump may also be used for injection purposes to introduce a selected quantity of fluid to a high pressure line.

Abstract: An apparatus includes a tilt piston having a piston head. The piston head is reciprocally disposed within a cylindrical bore formed in a housing, the bore being oriented along an axis. A seal is mounted circumferentially about the piston head. The seal has an outer diameter that exceeds an inner diameter of the cylindrical bore. The seal extends radially in a first direction having an axial component. A support is mounted circumferentially of the piston head adjacent the seal. The support has an outer diameter less than the outer diameter of the seal. The seal is a continuous annular ring which may be of a circular or rectangular cross section. The seal and the support may be formed as a unitary member or may be two distinct elements. The support contacts the bore during a portion of travel of the piston within the bore.

Abstract: A gas jet shooting device for use with a non-contact tonometer, having a hollow head (19) with a nozzle (27) secured thereto, a cylinder (10) which communicates with the head, and a piston (11) reciprocatably mounted in the cylinder and defining a compression chamber (14) in the cylinder, and a linear d.c. motor (31) for driving the piston (11) for compressing the gas in the cylinder (10), the compressed gas being allowed to issue through the nozzle. The cylinder (10) is fed with the gas through a passage which opens into the chamber (14) and which does not include the nozzle. The gas may be air, and drawn into or pushed into the chamber through a filter (F). It may also be a gas other than air, harmless to the eye, supplied from a reservoir through a filter. Such arrangement ensures that air-born dust or tear drops scattered by the air jet will not be drawn into the chamber, and the device can therefore be maintained hygienic.

Abstract: A combination pressure and vacuum pump for food or drink containers including a pump housing having a pump cylinder therein, a pump head adapted for sealing engagement with a valve stopper on a food or drink container, and a piston in sliding airtight engagement with the pump cylinder; the pump cylinder, pump head and piston defining a pump chamber. A handle is provided for moving the piston and the pump cylinder relative to one another to pump a gas into or out of the food or drink container. The pump chamber is connected to the valve stopper via a first opening when the pump head is sealed to the valve stopper and to the atmosphere via a second opening through a combination pressure and vacuum valve, the combination valve being switchable from a vacuum position to a pressure position.A combination pressure and vacuum valve stopper is also shown which includes a valve element reversible between a pressure position and a vacuum position to convert the stopper between pressure and vacuum use.

Abstract: The invention relates to a compressor having a piston and rod assembly which is segmented to allow adjustment of the compressor's output. In particular, fasteners accessible from the top surface of the piston can be removed so that shims can be added or removed from piston rod. The addition or removal of shims lengthens or shortens the piston rod so that the compression ration can be fine tuned. These adjustments, as well as replacement of the piston seal, can be accomplished without extensive disassembly of the compressor.

Abstract: Apparatus for evacuating a rigid container using a two-stroke reciprocating-piston pump having an air evacuating vacuum cup which is to be applied to the container lid. The pump cylinder houses a reciprocating piston-check-valve. An adhesive-tape check valve is applied to a container access opening in the lid; and the vacuum cup is seated over the adhesive-tape check valve to evacuate the rigid container. An alternative embodiment employing a vacuum probe having an in-line check valve is inserted into an otherwise plugged opening in the pump cylinder wall to evacuate a deformable container. In the second embodiment, the adhesive-type check valve is eliminated. The two check valves employed in each embodiment alternate open and closed states during piston reciprocation.

Abstract: Some precompression pumps currently used for spraying a liquid include a non-return valve formed by a gasket (3) held captive between the base of the pump body (1) and a sleeve (2). This non-return valve determines the extent to which the pump chamber (19) is isolated from or put into communication with a supply of liquid, as a function of whether the gasket (3) bears against the base of the pump body (1) or against the sleeve (2), closing a central hole through the pump body or being held off a central hole through the sleeve.

Abstract: An air spring seat principally for buses, trucks, boats or other vehicles includes a manual air pump for inflating and deflating the air spring. The manual air pump includes a piston having a rearward air intake stroke, a forward compression stroke to deliver pressurized air through a check valve delivery and venting system to the air spring, a pressure stabilized at rest position at the end of the compression stroke and a forward venting stroke from the at rest position mechanically to release air from the air spring through the check valve delivery and venting system. A floating seal carried by the piston provides a fluid tight seal between the piston and pump body during the piston compression stroke but permits air to move from the intake side of the piston to the compression side of the piston during the piston intake stroke. The piston movements are all controlled by a manual lever handle readily accessible to the seat occupant.

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 plunger type pump for use with heavy oil or oil mixed with sand is set forth. It incorporates bottom and top cylinders which are joined at a central bushing. A standing check valve in a polished tube enlargement at the top end cooperates with a bottom check valve in the bottom cylinder. A safety joint on the sucker rod string is included for easy connection. Another feature is a top end sleeve connected with a pin and J-slot arrangement held to a surrounding sleeve. Two sleeves are separated by breaking shear pins axial movement, rotation in a particular direction and additional axial movement to accomplish J-slot disengagement.

Abstract: Stopper (1) with valve (6) for a bottle, which stopper (1) and valve (6) are integral and of the same elastic material, the valve being surrounded by a circular raised edge (5) and a circular flange (4) for cooperation with a pump (15) made from plastic material.

Abstract: A scotch yoke compressor assembly is disclosed wherein four radially disposed pistons reciprocate in cylinders defined in a crankcase. In a central portion of the crankcase, a scotch yoke mechanism operably couples the pistons to an eccentric portion on a rotating crankshaft. Each piston includes suction ports extending therethrough and a suction valve on the piston head. The suction valve is operably retained on a piston head and the piston is attached to a yoke member by a single bolt. The bolt head is received within a recess coined in a valve plate interposed between the crankcase and a cylinder head cover. Circularly arranged discharge ports in the valve plate are opened and closed by an annular discharge valve guidedly retained against the valve plate at diametrically opposed locations, by a combination of guide pins and an annular retainer member.

Abstract: A gas stream blower for non-contact type tonometer comprises a cylinder, a piston arranged in the cylinder to divide the interior thereof into an air open chamber and a compression chamber, a nozzle communicated with the compression chamber such that air in compression chamber is compressed by advancing the piston toward the compression chamber and thus the compressed air is blown toward an eye-examining position through the nozzle, a first one way valve which is fitted in the piston and is closed at the time of air compressing, and a second one way valve which is provided in the midway of a communicating path between the compression chamber and the nozzle and is opened when the pressure of the compressed air is higher than a predetermined value.

Abstract: A barrel pump having a handle attached to a freely rotatable ring-like member carried on the head portion of the pump whereby the handle can be freely swiveled in relation to the head portion to enable the handle to be positioned at substantially any angle with relation to the spout of the pump.

Abstract: A finger-operated spray pump assembly adapted to maintain a seal against leakage under substantially all conditions normally encountered by the pump. The assembly includes a compression chamber, a piston slidable in the housing, a grommet for holding the piston in the compression chamber, a stem slidable in the piston, and a seal member abutting the piston. The lower end of the valve stem contacts the seal member to open the seal slightly before the piston starts its downstroke. A closure member for the container to be used is permanently attached to the spray pump.

Abstract: A valve is disclosed, which provides its principal utility in oil field pumping operations, having a valve body with an interior quiet chamber. Ports are provided beneath the chamber, shown as holes in the side wall of the valve body. A pin extends downwardly in the quiet chamber, and a valve is provided having a long stem with a hollow bore proportioned for a sliding fit along the aligning pin, the valve terminating in a head having a seating portion. A seat is provided in the lower portion of the valve in open communication with a lower extension. In an alternative embodiment, a second seat is provided at a mid portion of the valve to mate with a chamfered seat in the lower portion of the quiet chamber. In addition, a stainless steel insert is provided on the face of the lower valve seat. The valve is preferably formed of a light weight, non-corrosive, relatively inert moldable plastic, such as that known as delrin.

Abstract: A pumping system for conveying animal waste from a livestock housing to a remote storage area includes a hopper which is conveniently located in a pit adjacent to a chain driven barn cleaner or the like, a vertically oriented upwardly open pumping chamber in communication with the hopper and a hydraulically operated ram which travels vertically through the hopper into the pumping chamber to force the waste through a reducer and discharge pipe to a storage pit or area located remote from the livestock housing. Other features include a vacuum relief valve located in the pumping chamber or ram to release the vacuum on the return stroke of the ram and thus, reduce the power required to move the ram to its retracted position. The vacuum relief valve also eliminates the need in some installations for a check valve to prevent reverse flow of manure into the hopper from the storage pit.