Showing papers on "Piston published in 1972"

Fluid dispensing gun

Abstract: Apparatus for slowly and uniformly injecting fluids, such as liquid anesthesia, into a human or animal body, comprising a gunshaped body having handle and barrel portions, a piston extending axially through the barrel portion, fluid pressure means for selectively extending or retracting the piston, and adjustable damping means associated with the piston to permit controlled movement thereof; whereby when a syringe having a compressible cartridge is operatively connection to the apparatus, extension of the piston causes compression of the cartridge to effect the desired controlled dispensing from the syringe.

Fuel injection apparatus for internal combustion engines

Abstract: There is described a pump-and-nozzle assembly which forms part of a fuel injection apparatus serving an internal combustion engine and which includes a reciprocating pump piston performing its injection strokes by virtue of hydraulic pressure intermittently applied thereto in a servo pressure chamber. Between two injection strokes the pump work chamber is charged with pressurized fuel while the pump piston executes its return or charging stroke. During this period the fuel in the servo pressure chamber is discharged through a throttle which brakes the motion of the pump piston during its charging stroke to effect a charging period which is substantially longer than the injection period. By varying the switching periods of a solenoid valve which controls the admission of pressure into the servo pressure chamber, the duration of the charging strokes and thus the injected fuel quantities may be altered.

Safety belt tensioning device

Abstract: The invention concerns an apparatus for tensioning restraining devices, such as safety belts. The tensioning is effected by a piston arranged to move within a cylinder when actuated by a pressure medium. A return stopping device is provided to maintain tension after actuation.

Dispenser for precisely metered dispensing of viscous fluids

Abstract: A dispenser is disclosed for the precise metering of a plurality of viscous fluids, such as the components of an epoxy adhesive in which small amounts to be metered are desired and the proportion of components is critical. The dispenser includes a cartridge, a plurality of pistons operatively located in cylindrical compartments in the cartridge, and means for connecting the ends of the pistons and maintaining the pistons in alignment during dispensing. The cartridge includes a plurality of adjacent cylindrical compartments having adjoining walls, a rear wall at one end of the compartments and having annular openings therein of a diameter equal to the diameter of the respective cylindrical compartments, and forward end closures having orifices leasing through channels to adjacent nozzles. The pistons include a piston drive tab, longitudinal ribs and radial ribs, and a piston head providing sealing means in engagement with the walls of its respective cylindrical compartment. An important aspect is that the longitudinal and radial ribs extend radially from the axis of the piston substantially as far as the radius of the respective cylindrical compartment, in order to reduce the possibility of misalignment of the pistons during dispensing. In addition, misalignment forces are also minimized by the provision of finger tabs on each side of the cartridge spaced equally from the mean thrust axis of the pistons and positioned adjacent to the rear wall of the cartridge.

Dispensing device having lost motion piston pump

Abstract: A piston rod extends longitudinally through a chamber of a cylinder which is provided in one end wall with a dispensing nozzle. A piston surrounds and is slidable along the piston rod between a forward position expelling matter through the nozzle, and a retracted position. One or more passages are provided in the piston and/or the piston rod and these passages connect opposite axial ends of the piston but are open only when the piston is in the forward position. A supply of material to be dispensed communicates with the chamber rearwardly of the piston.

Parametric Acoustic Transmitting Arrays

Abstract: A numerical solution of Westervelt's inhomogeneous wave equation is obtained to describe the pressure field of sum and difference frequency radiations created by the nonlinear interaction of two monochromatic carriers in the farfield of a circular piston source. Experimental results are presented on the propagation and beam patterns of sum and difference frequency radiations resulting from the interaction of 418‐ and 482‐kHz carriers emitted by a 3‐in.‐diam piston located in a fresh water lake. These results support the numerical methods. Several approximations commonly made to obtain dosed‐form solutions are then evaluated with the numerical solution.

Machine for the injection molding of a mixture of plasticized synthetic material

Abstract: An apparatus for producing particularly large-surface objects by injection-molding in a mold a mixture of plasticized synthetic material and a foaming agent, which comprises the steps of feeding the mixture to a plurality of complete injection-molding units, each including an injection-molding cylinder, an injection molding piston reciprocating in the cylinder and an injectionmolding nozzle. The mixture is injected through all injectionmolding nozzles by means of the individual injection-molding pistons into a mold.

Packaged syringe construction

Abstract: A cylinder for containing medicine having one end closed and a piston in the other end, a needle mounted on the closed cylinder end in a storage position exteriorly of the cylinder and shiftable to a used position impaled through the closed cylinder end, an open ended outer protector or shield about the cylinder having an internal shoulder adjacent to the closed cylinder end and an end closure on the end adjacent to the piston, and a needle sheath extending into the shield past the shoulder where it is provided with a retaining enlargement, so that the cylinder and needle are completely enclosed.

Beverage dispensing apparatus for dispensing a predetermined quantity of fluid

Abstract: An automated beverage dispensing system for dispensing liquor, soft drinks, or mixed drinks from a single dispensing nozzle assembly. Liquor is drawn by vacuum from a vertically upright bottle having a tube inserted therein in loose fitting relationship so that atmospheric air pressure may be received within the bottle. Liquor is dispensed by a displacement pump having a liquid metering chamber whose volume may be adjusted. The displacement pump includes a reciprocating piston, and a gas expansion chamber at the rear of the piston to which pressurized gas is supplied for driving the piston forward. The dispensing stroke of the liquor dispensing pump is initiated manually but is timed automatically. A push-button on the nozzle assembly is depressed for initiating the supply of energy to the dispensing pump, and the forward movement of the piston then generates liquid pressure which is detected in a control loop through a pressure-sensitive device and utilized for continuing the energization of the pump. When the piston strikes the forward end wall of the pump the operation of the control loop is interrupted.

Rocker arm engine brake system

Abstract: A rocker arm engine brake system for an internal combustion engine in which a rocker arm is movable by a cam operating off the cam shaft to open the exhaust valve of a cylinder at the usual time in the piston cycle; and when it is desired to retard the speed of the engine, a lash piston in the rocker arm is hydraulically extensible at the will of the operator to take up the usual lash between the rocker arm and the exhaust valve so as to enable an auxiliary cam operating off the cam shaft to effectively cooperate with the rocker arm to open the exhaust valve at a time toward the end of a compression stroke of the piston so as to dissipate the energy of gases of compression from acting upon the piston. Separate passages in the rocker arm shaft are utilized for providing fluid for operating the lash piston and for general lubrication. The passages are interconnected by bleed holes. Selective control of the hydraulic system is obtained by means of a solenoid operable valve.

Rotary piston engine

Abstract: This disclosure relates to an internal combustion engine that uses a rotary piston for overcoming the disadvantages of currently available engines. The disclosed engine is simple, and may be used in a multi-cylinder arrangement for increased power production.

Method and apparatus for joining ends of pipe sections by driven force fit and joints formed thereby

Abstract: 1277461 Jointing; tube expanding; rolling tubes W W MOUNT 3 June 1969 [5 June 1968] 28057/69 Headings B3J B3M and B3U [Also in Division F2] The method of joining two metal pipe sections together as described in Specification 1,153,150 is further characterized in that the pipe sections are maintained in axial alignment during the joining operation by a mandrel (Fig 4A, not shown) or by guides 26, Fig 7 In an embodiment described, the end of the pipe section 1 is flared by moving a pipe gripper 45 by piston and cylinder units 38, 41, 40, 42 towards a flaring tool 53 positioned on the piston rods 41, 42 After removing the flaring tool 53, the pipe section 1 is forced over the other stationary pipe section which is gripped by a gripper 31 connected to the cylinders 38, 40 The internal restriction formed by the bent-in nose of the inner pipe section of the joint may be removed by a rotating grinding wheel (15) (Fig 4, not shown) or a pair of rollers 18, Fig 5, attached to a rotatable shaft 17 and movable into engagement with the pipe section by fluid operated cylinders 21

Experimental Investigation of Finite‐Amplitude Acoustic Oscillations in a Closed Tube

Abstract: This paper describes an experimental study of the pressure waveforms generated by a piston in a closed acoustic resonance tube. The study was prompted by waveform predictions of Chester [J. Fluid Mech. 18, 44–66 (1964)]. For the experimental system used, a high piston displacement amplitude is required to establish an experimental condition consistent with the approximations of Chester's analysis. Consequently, graphical comparisons between theory and experiment are made at resonance and at two frequencies bracketing resonance for three successively higher piston displacement amplitudes. Although better agreement is expected as the amplitude increases, this increasing agreement is observed only at the frequency above resonance, and not at resonance or below. However, good qualitative agreement between the shapes of experimental and predicted waveforms is found at high piston displacement amplitude. The pressure response curve of the experimental system is found to be asymmetric, i.e., skewed toward higher frequencies. On the basis of this observation, a qualitative argument is presented to account for the waveform inconsistencies between theory and experiment.

Resuscitation apparatus for simultaneous cardiac massage and artificial respiration

Abstract: A light and self-contained device which allows resuscitation of an accident victim by a single person, even if inexperienced in resuscitation techniques. The apparatus has a base on which are mounted two vertical columns which are sufficiently spaced apart to admit the chest of a prone person. On the upper portions of these columns slides a cross-piece which can be clamped on the columns at an adjustable distance from the base. A vertical cylinder is mounted below the centre of the crosspiece and in it slides a piston provided with two piston rods. The upper rod is linked to a second order lever with which the piston can be reciprocated vertically. The lower piston rod is provided at its lower end with a rubber-based plunger for application to the chest of the patient. The upper end of the cylinder is linked by a pipe to a rubber air reservoir balloon. The lower end of the cylinder is linked by a pipe to a bellows made of a flexible, synthetic material. The air reservoir balloon is connected by a pipe to a face-mask for pumping air to the patient. The bellows is linked to a pistol with a manually controlled valve for suction of vomit from the mouth of the patient. In the piping of the face-mask is situated a safety valve set for a determined excessive air pressure, and on the pipe circuit for suction of vomit is placed a vomit reservoir. By means of T-pieces, the pipes connecting the cylinder to the balloon and the bellows are connected to a three-way valve on the crosspiece, allowing the connection to atmosphere of one or the other of these elements. A movable panel between the columns supports the head and chest of the patient and movement of the panel allows the plunger to be situated precisely at the base of the sternum of the patient. The handle of the lever is adjustable and dynamometric, so that the force applied to the chest by the plunger can be adjusted to the size of the rib cage and the age of the patient, to avoid possible fracture of the ribs.

Control valve and system

Abstract: A CONTROL VALVE IS PROVIDED IN A HORIZONTALLY SPLIT BRAKE SYSTEM HAVING SEPARATE FLUID PRESSURE SUPPLIES WHEREIN AT LEAST ONE BRAKE OF THE FRONT AND REAR BRAKE SETS IS CONNECTED IN EACH SYSTEM, AND SAID CONTROL VALVE INCLUDES SEPARATE SPRING-LOADED PROPORTIONING PISTONS GENERALLY OPERABLE IN SAID SYSTEMS IN RESPONSE TO A PREDETERMINED VALUE OF THE FLUID PRESSURES SUPPLIED THERETO FROM SAID FLUID PRESSURE SUPPLIES TO THEREAFTER PROPORTION THE FLUID PRESSURES APPLIED TO THE REAR BRAKES. UPON THE FAILURE OF ONE SYSTEM, THE PROPORTIONING PISTON OF THE OTHER OR OPERATING SYSTEM IS OPERABLE NOT ONLY AGAINST ITS SPRING LOAD BUT ALSO AGAINST THE SPRING LOAD OF THE PROPORTIONING PISTON IN THE FAILED ONE SYSTEM TO INCREASE THE PREDETERMINED VALUE OF THE SUPPLIED FLUID PRESSURE AT WHICH THE PROPORTIONING ACTUATION THEREOF IS EFFECTED.

Reciprocating plunger type fuel injection pump having electromagnetically operated control port

Abstract: A fuel injection system for an internal combustion engine of the type having a reciprocating piston pressure pump that includes an electromechanically operated relief or control valve that is arranged so that the face of the valve is not subjected to the pressurized fluid in the pumping chamber, thereby requiring less electromechanical energy to open and close the valve. In this type of arrangement it is now possible to control the opening and closing of the relief valve independently of the reciprocating motion of the piston which pressurizes the fuel in timed relation to rotation of the camshaft or crankshaft of an internal combustion engine.

Bore hole air hammer

Abstract: An air hammer embodying an outer housing structure connectable to a rotatable drill pipe string through which compressed air is conducted. A hammer piston reciprocates in the housing structure, compressed air being directed alternately to the upper and lower ends of the piston to effect its reciprocation in the structure, each downward stroke inflicting an impact blow upon the anvil portion of an anvil bit extending upwardly within the lower portion of the housing structure. The compressed air acts against the piston over the full internal cross-sectional area of the housing structure in delivering its impact blow, such compressed air acting downwardly over at least a portion of the piston area during its entire downward stroke, including its latter portion, during which the power or impacting air is being exhausted from the housing structure.

Hermetically sealed pump

Abstract: A hermetically sealed pump includes a cylinder that defines a piston chamber for a reciprocating piston driven through an eccentric cam member and a cam follower operatively connected between the piston and the cam. A fluid manifold is associated with the piston cylinder and has suction and discharge ports located in communication with the piston chamber for supplying fluid to and discharging fluid from that chamber, and a pair of valves are operatively associated with these ports for simultaneously opening one of the ports and closing the other of the ports, in response to pressure in the piston chamber. A toroidally shaped rolling diaphragm hermetically seals the piston chamber on the side of the piston opposite the ports, thereby to prevent loss of fluid in the pump through the piston chamber.

Hydraulic shock-absorbing device

Abstract: A hydraulic shock-absorber of the oleo type with a double-acting piston and cylinder containing a damping fluid has an outer casing around the cylinder with an annular space interposed therebetween and communicating at its ends to the ends of the cylinder to constitute a fluid storage chamber, and this chamber is communicatively connected to a cooling device for cooling the fluid in the chamber and the cylinder, the fluid in the cylinder being caused by the movements of the piston to flow through the chamber and in and out of the cooling device.

Motion compensated crown block system

Abstract: A motion compensated crown block system in which a crown block sheave means is movable along a vertical path defined by a framework usually forming part of a drilling rig which is supported on a vessel. The crown block sheave assembly, which carries the hook load, is principally supported by inclined fluid pressure cylinder and piston means having one of their ends pivotally connected to the sheave means and their other ends pivotally connected to the framework in lateral spaced relation to the generally vertical pathway of the sheave means. Changing inclination of the cylinder and piston means during relative movement of the crown block sheave assembly and vessel provides variation in the piston reaction vertical force component which is caused to be nearly proportional to the change in fluid pressure in the cylinder and piston means. Load variation of less than 5 percent of the hook load is achievable over the full path of travel of the sheave means and is in the order of 2 percent over a major portion of said path in which the crown block sheave assembly travels. Means for sensing motion of the crown block sheave means relative to the sea bed are also provided so that the crown block sheave means will be virtually stabilized to maintain unchanged relation with respect to the sea bed during heaving of the vessel as caused by wind and wave action. Means are also provided for reducing to a minimum travel of the sheave cables over idle sheaves during travel of the crown block sheave means in its vertical path.

Hand powered hypodermic jet injector gun

Abstract: A hand powered hypodermic jet injector gun has a hollow housing with a depending handle formed with a cavity containing a working fluid. A first chamber in the housing receives the working fluid from the cavity via a hand pump and one-way valves. A piston and coil spring in the chamber are retracted by the working fluid entering the chamber thus to cock the gun. A piston rod attached to the piston is slidable in a muzzle to eject medicament from a second chamber in the muzzle via a nozzle thereon. The muzzle is slidably adjustable by a rotatable coupling ring on the housing of the gun to adjust the volume of the second chamber. A trigger at the hand operates another one-way valve for releasing the working fluid from the first chamber allowing the spring to expand and move the piston rod for ejecting the medicament from the second chamber.

Cell for collecting and mixing fluids

Abstract: Apparatus for collecting a sample of fluids which includes a piston slidable in a cylinder displacable by the sample. A mixing element is provided within the cylinder. The piston and end wall of the cylinder are of such configuration that when the piston and end wall are in contact a small space of the proper size and shape is left to just enclose the mixing element leaving substantially no dead space within the sampling chamber.

Horizontal vibration isolation system

Abstract: A horizontal vibration isolation system including a hollow piston defining a chamber closed by a top plate which is formed with a central aperture. An internal plate is suspended in the chamber by a plurality of cables secured between the top plate and the internal plate which supports a connecting rod which protrudes axially through the aperture in the top plate. The protruding end of the connecting rod is formed to be secured to the bottom surface of the member which is to be isolated from horizontal vibrations. The chamber may be filled with oil for damping the horizontal motion of the system at resonance. The cables may be solid metallic rods or be formed of braided wire. Each cable is swaged at its lower end, e.g., with a ball end, which fits into a hole therefor formed in the internal plate. The cables are adjustably secured to the top plate for aligning the internal plate to a desired horizontal position. In operation, a plurality of the pistons are provided, each of the pistons being secured to a bottom surface of the isolated member. Each of the pistons may be supported on a flexible diaphragm which provides vertical isolation of the vibrations, the diaphragm also forming the sealing surface of a fluid chamber, the fluid being a compressible gas such as air or nitrogen.

Pump-and-nozzle assembly for injecting fuel in internal combustion engines

Abstract: There is described a pump-and-nozzle assembly which forms part of a fuel injection apparatus serving an internal combustion engine and which includes a reciprocating pump piston, the angular position of which determines the injected fuel quantities during the delivery strokes. The pump piston is driven by a servo piston which is intermittently exposed to pressurized fuel delivered by a pressure source. The intermittent admission of pressurized fuel to the servo piston is controlled by a valve plunger which is exposed to pressurized fuel for periods controlled by a solenoid valve.

Tire inflation valve with pressure indicator

Abstract: A operatively attached constantly ready-for-use self-contained tire valve and companion air pressure indicating device having an elongated barrel or tube with an axial bore, said tube providing a core for the overall device. A normally closed conventionaltype tire valve is telescopingly fitted within the outer screwthreaded end portion of the bore and is accessible for attachment and association therewith of an air pump hose. The outer end portion of the tube is externally screw-threaded to accomodate a protective screw cap and also a valving nut for air exhausting and bleeding as hereinafter set forth. The inner end portion of the tube is embedded air-tight in a central or axial portion of a rubber adapter base. The base is peripherally grooved and adapted to be lodged and retentively anchored in an opening provided therefor in a portion of the tire rim. Cylinder means surrounds a predetermined portion of the tube and more specifically comprises inner and outer concentric cylinders with the space therebetween providing a pressurized air trapping chamber. Inner end portions of the cylinders are also embedded in the base. The base has slots or openings allowing the air from the tune to pay back into the chamber. A spring-biased piston, is confined for sliding movement in the chamber and has suitable O-rings to provide shiftable but air-tight contact between inner and outer peripheral surfaces of the piston and cylinders. The outer cylinder has a graduated scale and the coordinating piston provides an indicator for measuring association with the graduations of the scale. Exhaust ports at the outer end and an opening and closing and valving nut on a threaded portion of the tube make it possible to exhaust air from the chamber to permit accurate operation of the indicator.

Variable-ratio toric drive with hydraulic relief means

Abstract: A variable-ratio frictional drive gear comprises at least two axially spaced torus discs between which there is a set of circumferentially spaced drive rollers in frictional rolling contact with toroidal surfaces on the discs. Each roller is rotatably mounted in a tangentially controlled roller carriage having end portions lying on a roller tilt axis at right angles to the axis of rotation of the roller. The end portions of each roller carriage are slidably and rotatably supported by a support member whereby the roller carriages can be moved tangentially in order to control indirectly the ratio angle of the roller. There is further provided a piston which is slidable in the cylinder and which is connected to one end portion of a carriage of at least one roller to thereby, in use, effect tangential movement of the roller carriage. Means are also provided to reduce fluid pressure which, in use, is applied to the piston, such reduction occurring when the piston reaches a predetermined axial position.

Manually operated sprayer

Abstract: A hand operated sprayer adapted to be threaded on a bottle, or other liquid container. A trigger-like handle actuates a piston which pumps liquid from the container and discharges it through a nozzle, reversed flow being prevented by inlet and outlet checks in inlet and outlet passages respectively leading from the container to the cylinder and from the cylinder to the nozzle.

Suction-pump assembly for drawing body fluids

Abstract: A disposable evacuator assembly for drawing fluids from a surgical site or body orifices. The assembly comprises a standard syringe in which a piston is slidable within a cylinder whose upper end is flanged. The lower end of the cylinder is provided with an outlet that is coupled through a uni-directional relief valve to a collector bottle which, in turn, is coupled by a drain pipe to the surgical site. The piston is actuated by a stem terminating in a flange. The assembly is operatively associated with a driver provided with a stationary fitting adapted to receive the cylinder flange and to latch the cylinder thereto, and a movable fitting adapted to receive the stem flange, the movable fitting being shifted back and forth relative to the stationary fitting to cause reciprocation of the piston within the cylinder to create a suction force drawing fluid into the collector bottle. To dispose of the assembly after use, the syringe is detached from the fittings.

Process and system for increasing load-bearing capacity of soil

Abstract: Improved air gun energy source adapted to be submersible in water, sand, gravel, soil, marshland, concrete slurry or the like for repeatedly suddenly discharging pressurized air into the surrounding material including means providing a flushing venting of pressurized air from the operating cylinder into the release cylinder during the time when the operating piston is unseated from its stop to prevent the entry of grit into the release cylinder when the discharge port is opened by the release piston. The flushing venting air flow is shown passing around the release piston.

Breech loaded syringe with deformable piston

Abstract: A plunger assembly for a syringe adapted to be filled through the breech end of the syringe barrel including a piston rod having a piston on the distal end thereof for insertion into the breech end of the barrel, and a piston control member slidable in an opening in the piston rod and engageable with the interior of the piston to stretch the piston and provide a vent passage around the piston during movement of the piston and piston rod in the barrel. Medicament is introduced into the syringe barrel to the desired level and the plunger rod and control member are moved relative to each other to stretch and deform the piston. The deformed piston is then moved in the syringe barrel to a desired position and released by the control member into sealing engagement with the barrel.