Abstract: A breakerless pulse generating and distributing system in which sensor-switches (such as Hall effect switches and LED triggered switches) in a distributor transmit a timing pulse to one of a plurality of series connected power switches. The sensor-switches are powered by the timing pulses being transmitted and a constant current drain is avoided.

Abstract: An RC circuit branch determines the duration of the period for which the primary circuit of a spark coil remains interrupted after the main peak of the spark discharge in the secondary circuit that includes a spark plug. Engine speed and engine temperature are used to shorten the period during which the secondary circuit is allowed to entertain a spark discharge. As engine speed increases the spark discharge period is reduced until a certain speed is reached after which the spark discharge period remains constant with further increase of engine speed. Engine temperature is also used to shorten the spark discharge period by the use of a temperature sensitive resistor. The charging and discharging of the storage capacitor of the RC circuit branch are separately controlled by the shunt circuits in which diodes are interposed and in one embodiment an additional capacitor can be switched into parallel into the RC circuit branch when the engine is starting up.

Abstract: A monitoring resistor in series with the spark coil primary winding and the electronic interruptor switch provides a signal to an integrator for shifting the control thresholds of a threshold switch that controls the interruptor away from their quiescent values that are nearer the zero crossover of the timing voltage wave provided by an engine driven timing signal generator. The integrator output voltage remains constant during the time the interruptor switch is open. While current flows through the interruptor circuit, the integrator increases the control voltage until the primary winding current reaches a predetermined level and then decreases the control voltage until the timing wave recloses the interruptor.

Abstract: Disclosed is a method of igniting in an internal combustion engine comprising a main combustion chamber and an auxiliary combustion chamber which are interconnected to each other by a connecting passage. The spark gap of the spark plug is located in the connecting passage. A ratio of the volume of the auxiliary combustion chamber to the cross-sectional area of the connecting passage is set in the range of 5 through 15 cm for creating a strong swirl motion of the combustible mixture in the auxiliary combustion chamber at the time of the compression stroke. The length of the continuance time of the discharging arc is set at approximately 1 m sec.

Abstract: A Kettering type ignition system is improved by modulating the transient output from such system with an AC component signal to substantially increase the energy delivered to the igniters. The system provides for impedance matching of the AC source to the impedance of the ignition transformer. Ignition transformers with single and multiple primary windings are utilized.

Abstract: An engine starting device for starting an engine by connecting an output member on the side of a spiral spring and an input member on the side of the engine with each other when the force accumulation by the spring is released. A driving member is driven by the output of the engine. An automatic force accumulating operation mechanism for the spiral spring is driven by the driving member. A one-way clutch connects the automatic force accumulating operation mechanism in a winding pressure accumulating mechanism for the spiral spring with each other.

Abstract: An internal combustion engine and a method of operating same, comprising a combustion chamber having main and auxiliary sections. The air-fuel mixture compressed in the combustion chamber causes turbulence and swirling of the mixture in the auxiliary section. On ignition, the initial combustion rate in the auxiliary section is limited by the centrifugal force on the flame. The jet of gases rushing out of the auxiliary section is not swirled and controls the rate of burning in the main section to reduce peak flame temperature and hence, to reduce CO, NO.sub.x and HC emissions.

Abstract: In a non-load operation of a multi-cylinder internal combustion engine, both suction flow of newly supplied air-fuel mixture to be introduced in a first combustion chamber and exhaust flow of combustion gas to be exhausted from the first combustion chamber or only the exhaust flow is throttled to carry out compression ignition combustion in the first combustion chamber, while suction flow of newly supplied air-fuel mixture to be introduced into a second combustion chamber is blocked to stop combustion in the second combustion chamber to increase a gas feed rate in the first chamber, to thereby cause a kind of run-on phenomenon in the engine in non-load condition.

Abstract: An engine combustion system is provided wherein fuel is supplied to the engine combustion chamber in the form of a hot vapor. The system preferably includes a preburner wherein a portion of a liquid fuel supply is burned internally to provide a hot, gaseous admixture of gasified fuel and products of combustion. A portion of the output of the preburner is used to heat air induced into the intake manifold, the heated air being thence supplied to the combustion chamber. The output of the preburner can also be used in auxiliary units such as a heating system for the passenger compartment. For a piston-type engine, the gaseous fuel is released into the combustion chamber formed by the clearance volume above the piston at the top center position of the piston, air being compressed within a recess in the cylinder during the cylinder head and rushing past the fuel inlet upon the downstroke of the piston to provide thorough mixing and, hence, complete burning of the gaseous fuel.

Abstract: A free standing fireplace having a base, a fire pot mounted on the base, a fire pot housing ring encircling the fire pot, a substantially cylindrical combustion chamber vertically mounted on the ring, and a conical hood mounted on the combustion chamber. The hood has on its interior a substantially horizontally projecting, upwardly spiraling flange for imparting a circular motion to combustion fumes rising through the hood. The fire pot housing ring preferably contains two oppositely disposed air vents having openings facing in opposite directions, so that air drawn into the combustion chamber swirls in a circular motion in the same direction as the upwardly spiraling flange of the hood. A damper may be placed across the base of the hood between opposite portions of the flange for forcing the air into an upward spiraling motion, thereby allowing for greater heat absorbtion by the hood.

Abstract: A flexible water-impervious roof with a rigid peripheral structure provides support for a plurality of distinct and separate portions of liquid in a system that provides for repeated cycling of heat energy between its roof and its ground reservoir. The flexible roof is formed into a plurality of upwardly open incremental reservoirs which have walls in the form of dimples or tractrices and held in shape by a low-pressure gaseous support. The mechanical system that provides the gaseous roof support also provides the motive force for movement of the thermal energy exchange liquid from the positions thereof wherein energy is absorbed in such liquid to the positions thereof whereat such thermal energy is stored and/or disposed.

Abstract: A solar collector simple to install in the field comprises a mat formed of side-by-side extruded EPDM rubber strips having parallel hollow tubes, with inwardly diverging recesses extending along the strips so that the strips can be removably adhered to an insulating base without cement protruding above the tubes. A one-piece extrusion seals an edge of upper light transmissive panel, covers a side of the collector and seals the collector atop a roof or like surface.

Abstract: A solar energy collection and utilization storage system is constructed by using a lenticulated transparent element closed at the back to form channels which are used to carry an energy storage fluid. The lenticulations are designed as light trapping surfaces so that virtually all of the energy from the sun at any time of day falling on the sheet is trapped by the lenticulations and transferred to an energy storage fluid which is in the passages formed by the lenticulations and the back cover panel. The rate of flow through the solar collector panel is controlled by a thermostatic valve element which opens the flow when the fluid reaches a predetermined temperature. The energy storage fluid is a dispersion of a crystalline polymer in a heat transfer fluid which has the capacity of storing heat by a latent heat of crystallization as well as by sensible heat.

Abstract: A furnace having a nitrogen-heat separator comprised of a heat absorbing mass, such as cast iron plates, containing passages through which products of combustion can pass and deposit heat into the metal mass to thereafter be extracted and utilized, a baffle for directing products of combustion through the nitrogen-heat separator, a fiberglass cloth heat-retaining curtain for blocking the furnace exit and trapping heat inside the furnace when fuel combustion stops, a fan for extracting the stored heat from the nitrogen-heat separator when combustion stops and circulating it throughout the furnace interior.

Abstract: This disclosure relates to apparatus for waxing skis comprising a gas burner assembly adapted to be connected to a can of gas, and a waxing iron releasably attached to the gas burner assembly by means of a quick connect-disconnect device including a resilient snap element. The waxing iron includes a bottom plate having a convex configuration whereby only a limited portion of the surface area thereof may contact the surface of a ski thereby preventing burning of the ski or the wax being spread thereon.

Abstract: A method of displaying information obtained by pulse-echo ultrasonic examination of an object, particularly in medical diagnostic examination, comprises forming a first display representing the positions of acoustic impedance discontinuities within the object and simultaneously incorporating in the display other parameters relating to the object.

Abstract: A catheter is provided which comprises a tubular body that defines a passage therewithin terminating in an axially-facing opening at the tip end of the catheter, the opening serving as a sampling port. A pair of annular electrodes are arranged in spaced relationship around the sampling port on the rim of the open end and are connected to suitable measuring equipment.

Abstract: A disposable esophageal probe incorporating the capability to detect ECG waveforms, heart sounds and to measure body core temperature is described. The probe incorporates a plastic tube with electrically conductive pathways embedded in its side walls thereby eliminating any lumen obstruction. Its distal end is enclosed by a rubber sheath which provides a diaphragm for the transmission of sounds into the lumen of the tube. An integral disposable connector assembly is provided at its proximal end to enable direct connection to be made to the plastic pathways and the lumen. A modification of the probe which allows it to monitor respiration rate is also described.

Abstract: A photoendoscope comprising a telescope tube defining, near its distal end a viewing port, flash-tube assembly means connected to the distal end of the telescope tube and including a flash-tube proper enveloped in transparent protective sheath means arranged in a housing defining an aperture for transmitting light from the flash-tube proper and light conductor means extending along the telescope tube and terminating proximally of said viewing port, a barrel enclosing said telescope tube and said light conductor means at least in their distal end regions, and said flash-tube means, said barrel defining two apertures aligning respectively with said viewing port and with said flash-tube light transmitting aperture, and a transparent cylindrical sheath which is secured in said barrel, which extends for approximately the length of said flashtube proper and which covers said flash-tube light transmitting aperture, said transparent cylindrical sheath having a wall thickness which is greater where it covers said flas

Abstract: An endoscope is disclosed having a propulsion mechanism and at least one transmitter at the distal end transmitting bursts of energy waves (radio frequency or ultrasonic) for tracking the position of the distal end through the use of two or more transducers on the anterior or lateral surfaces of a patient. The propulsion mechanism may consist of two radially expandable bladders separated by an axially expandable bellows with only the forward bladder attached to the distal end so that by expanding and contracting them in proper sequence, propulsion of the endoscope is achieved. Alternate mechanisms comprise compliant paddles on the distal end directly on an articulated section, or compliant paddles on a rotatable sleeve on the distal end. The endoscope has a sheath which includes material having a sharp melting point slightly above body temperature so that the sheath may be made flexible at selected sections by applying current to separate heating wires in the sections of the sheath.

Abstract: Medical ventilating apparatus is provided whereby gas is supplied to a patient at a preset volume flow rate, with the patient breathing spontaneously what he can from this flow, while the remaining gas is accumulated and forcibly delivered intermittently at preset volumes. The apparatus comprises a primary reservoir to hold gas at a constant pressure for spontaneous breathing, and a secondary reservoir in which accumulated gas is held for forced ventilation. Two basic forms of apparatus are possible in each of which one reservoir is filled up to a preset volume and forced ventilation is triggered when the other reservoir has also filled to a preset volume. In one form the reservoirs are connected in parallel and triggering is effected by the secondary reservoir, and in the other form the reservoirs are connected serially and triggering is effected by the primary reservoir.

Abstract: An impregnated bandage having a backing strip with an adhesive coating on one side. A layer of or patch of absorbent material positioned in the approximate center from the ends of the backing strip. An impregnated layer of gauze adapted to contact the wound positioned above the absorbent layer. The impregnated bandage includes protective strips for protecting the adhesive surfaces until immediately prior to use and for separating the impregnated layer and the absorbent material. The protective strips are removed by a pulling movement applied to the ends of the protective strip prior to use of the bandage.

Abstract: A stocking knee brace of the type to be used by athletes with knee problems. Such brace comprises a one-piece stocking sheath adapted to cover at least a portion of the foot up to the mid-thigh region. The sheath, in its preferred form, is knitted and characterized by full dimensional stretch. Such sheath is maintained in compression and tension about the wearer's leg by the elastic nature of the knitted stocking and by a foot encircling strap within said sheath. The knee-joint position of such sheath is provided with two vertically elongated openings, one on each side of the knee-joint, and fastening means to provide additional lateral, compressive pressure to such knee-joint.

Abstract: This disclosure pertains to a gas scavenger apparatus utilized to recover anesthesia-logical gases derived during surgical procedures and to dispose same to a closed vacuum line substantially limiting the inadvertant escapage into the atmosphere. A reservoir bag is connected to the patient's anesthetic circuit, which in turn is connected to a scavenger valve. The vacuum line constantly empties the reservoir bag drawing off the waste gas accumulated therein. When the reservoir bag is substantially empty, a valve admits ambient air, as well as waste gas, into a chamber emptied by the vacuum line. Thus, the vacuum line does not act on the patient's anesthetic circuit, serving only to empty the reservoir bag as waste gas accumulates therein.

Abstract: A disposable liquid absorbent pad is illustrated wherein a wicking sheet of creped paper is utilized for supporting a cast film of acrylic polymer capable of forming a gel upon application of liquid thereto, there being a direct mechanical connection between the ridged surfaces of the creped paper and the film, and preferably voids between the ridges of the wicking sheet. The film is laminated to the creped wicking sheet by moistening one surface of the film as by a spray mist of liquid and then applying the resulting gel or tacky side to the ridges of the creped sheet. The product thus formed is suitable for use adjacent the human body and has particular application for use as diapers, underpads and bandages or wherever the absorption of liquids quickly and in relatively large amounts is desirable.

Abstract: Reconstituted tobacco sheet coated with a hydrophobic coating containing a spectrophotometrically-determinable metal cation, including the process of making such products and the process of monitoring the coating process to assure even distribution of coating on tobacco sheet.

Abstract: The method involves coating the periphery of a bald area on a person's head with a silicone adhesive sealant to define a peripheral track. The sealant actually penetrates the pores of the scalp and provides a mechanical coupling. Reinforcing material is in turn embedded after applying layers of the coating within this coating about the marginal edge of the bald spot. The marginal track or coatings are permitted to dry and the hair supporting base material of a hair piece is then stitched to the reinforcing material in the marginal track to thereby secure the hair piece in place.

Abstract: A storing and feeding device for coins comprises a tube having an end that widens toward the outside, with retainers at the widened end of the tube for retaining the coins. The tube is slidably mounted on a support that has resilient pads that widen the retainers to free the coins. The coins, in turn, have a packaging comprising an opening strip and a sealing flange. The opening strip is accessible from outside the tube through a longitudinal opening in its wall.

Abstract: A valve is described capable of rapid actuations. The valve includes a drive element disposed to pinchingly engage a collapsible tube at a high reciprocating speed. A follower is disposed on the other side of the tube and effectively coupled for reciprocation and cooperative movement with the drive element to maintain the tube pinched off. Control means and holder are provided to open the valve by retaining the follower at just that time when the follower is at a favorable reciprocated position so that further reciprocation by the drive element can open the tube. A normally open valve is also described and a control for operation of a plurality of valves is disclosed.

Abstract: An apparatus for mixing a first liquid component with at least one additional liquid component. A fluid flow-through measuring device in the form of a gear pulser is connected to a supply line for a first component and generates a number of electrical pulses corresponding to the flow volume. A geared feed pump connected to the supply line for each additional component is driven by an electric stepping motor. A current supply circuit for each stepping motor operates to maintain an adjusted mixing ratio in response to pulses generated by said flowthrough measuring device.

Abstract: A sliding gate valve comprising a housing; a sliding gate; an enclosed void space between the gate side edges and the wall of the housing when the gate is in the closed position; and a purge line for injecting pressurized fluid into the void space; improved by gate side edge sealing means comprising a downstream seat mounted on the interior wall of the housing and an upstream seat assembly comprised of a rigid, elongated channel on the interior wall of the housing, parallel to, and upstream of, the gate when in the valve-closed position, the channel having a back wall and at least one side wall, the back wall being substantially parallel to the gate; a rope positioned lengthwise in the channel; the channel having an elongated metal strip flexibly attached along the first of its two long edges to a side wall of the channel so as to sandwich the rope between the back wall of the channel and the rear surface of the metal strip; the seat assembly being positioned such that when the gate is closed the gate's upstr

Abstract: A replacement valve stem assembly for a faucet in the form of an internally and externally threaded sleeve extending through and secured by nuts to the faucet cap and a threaded valve stem engaging the internal threads of the sleeve and having a valve washer secured to the inner end thereof and a faucet handle secured to the outer end thereof.

Abstract: A butterfly valve assembly is disclosed having a resilient seat to compensate for wear. The valve has a rigid body with opposing end surfaces adapted to mate with opposing flanges. The body has opposing internal end surfaces spaced inwards from and having a smaller diameter than the external parallel end surfaces, a flexible ring within the annular body is adapted to deform under uneven stresses but to return to its original shape when the stresses are released. An annular seat of elastomeric material supports the flexible ring in a flexible relationship within the body to form a seat assembly leaving an annular space beteeen an external surface of the seat assembly and an internal surface of the body. The seat assembly has two external flanges, one at each end which overlap the internal end surfaces and are adapted to be clamped between the internal end surfaces and the opposing flanges.

Abstract: A method and means for converting a water drive center pivot irrigation system to air drive is described whereby the more economical air drive is substituted for the water drive on each of the drive towers. The water drive cylinder on each of the drive towers of the system is modified to function as an air cylinder which is operatively connected to the trojan bar on the drive tower whereby actuation of the air cylinder will cause the trojan bar to be reciprocally moved to drive at least one of the drive wheels on the tower. An alignment panel is mounted on the drive tower and is connected to the air cylinder for controlling the operation of the same. The alignment panel is operatively secured to the existing alignment control apparatus on the drive tower so that the alignment panel will function in response to the alignment control apparatus.

Abstract: A relay pilot regulator for use in combination with a main regulator in a gas distribution system, the gas distribution system including an inlet conduit supplying gas at an inlet pressure and an outlet conduit for delivering gas at a reduced outlet pressure, the main regulator including a main valve controlling gas flow from the inlet conduit to the outlet conduit and thereby also controlling the outlet pressure, a main regulator diaphragm mechanically linked to the main valve and a loading chamber the loading pressure in which acts on the main regulator diaphragm wherein the loading pressure positions the main regulator diaphragm and the main valve, the relay pilot regulator providing and controlling the loading pressure in the loading chamber.

Abstract: A safety device for venting a fuel tank, especially for automobiles comprising a natural or artificial elastomer diaphragm resistant to hydrocarbons, pierced by slits, held between the flanges of two concentric cylindrical elements constituting a valve body, a clearance being provided between the membrane and the flanges framing it so as to avoid having the latter cause stresses in the said membrane which would lead to deformation of the slits and would modify in an unpredictable manner gas flow passing through it.

Abstract: A check valve is disclosed which uses a valve body having a bore with a first section smaller than a second section, an inlet communicating with the first section to receive flowing fluid, a shoulder disposed between the first section and the inlet for providing a valve seat, and an outlet communicating with the second section for discharging the fluid. A valve element is mounted within the inlet for engaging with the valve seat to shut off the fluid flow. A movable piston is mounted with the valve body to control movement of the valve element. The piston has a body portion slidably mounted with the second section, the body portion having a shoulder facing away from the valve element; a male portion is slidably mounted with the first section and extends from the body portion, the male portion having a shoulder facing toward the valve element; and a stem extends from the male portion into the inlet of the valve body for mounting with the valve element.

Abstract: A check valve used in a fluid flow line is disclosed and includes a body having a first portion defining an inlet passageway, an outlet passageway and a shoulder which directs fluid flow upwardly through an opening into the outlet passageway and a second portion with a tubular section threadably engaged in the opening which receives the flowing fluid in one end for flowing up the tubular section and out outlet ports. A flange extends outwardly from the tubular portion at a location below the outlet ports to define an upwardly facing sealing surface. A plunger member is mounted within the body and includes a plug slideably mounted within the longitudinal passage and a tubular sleeve mounted to circumscribe the tubular section with the sleeve having a shoulder forming a downwardly facing sealing surface which is engageable with the upwardly facing sealing surface on the flange, the sleeve being moved upwardly by the pressure exerted by the fluid on the plug.

Abstract: Improved check valve adapted for operation under light pressure, as in the oral inflation of inflatable articles. The valve has a valve body and a movable valve element therein, the valve element having a body which carries an annular sealing means cooperating with and selectively sealing an axially outwardly converging valve seat on the valve body, the angle of engagement between the sealing member of the valve element and the valve seat at the valve-closed position of the valve element exceeding the angle of repose of the engaging parts of the sealing member and the valve seat. The sealing member, which is molded in place on the body of the valve element, has an annular main part surrounding an enlarged head on the body of the valve element and a sheet-like disc which is integral with the main part of the sealing member and overlies the axially inner end of the head on the body of the valve element.

Abstract: A check valve ball stop clip for use in Tee check valves has a U-shaped configuration with an outwardly projecting extension at the top of one of the arms. The Tee valve has a valve seat and a ball in the crossbar at one side of the upright. The stop clip is insertable and removable in a compressed condition through the upright of the Tee valve and is expandable to lock in the inner section of the upright and the crossbar such that one arm of the U holds the ball at the one side while the other arm with the extension holds the stop clip in place.

Abstract: A presettable fluid flow regulator having a body in the form of an elongated sleeve of flexible material and a core within the sleeve having a recess of varying cross section on its outer surface along its length. A ring on the outside of the sleeve having an internal diameter slightly less than the outer diameter of the sleeve is used to squeeze the sleeve against the core to define a flow passage between the body and the sleeve. The volume of flow is determined by the longitudinal position of the ring along the sleeve.

Abstract: This invention relates generally to fluid discharge devices and, more particularly, to a discharge device for use with a combined filling and draining faucet attachment commonly used with portable washing machines and portable dishwashers. The invention relates specifically to a fluid discharge device having a round hollow truncated cover shaped body with a tubular structure at the top, an adjustment tube inserted into the tubular structure of the body and extending upward allowing for height adjustment of the device. The vertical discharge outlet of the faucet attachment is inserted into the top of the adjustment tube and the height of the discharge device is adjusted so that the base of the device rests on the bottom of the sink and encircles the sink drain.

Abstract: An arrangement for controlling the flow of a hydraulic fluid between a pump, a user and a fluid reservoir includes a main control slide, an auxiliary control slide accommodated in a compartment provided in one end of the main control slide, a flow-regulating valve arranged in parallel to the main control slide between the pump and the fluid reservoir and a holding valve arranged in a pressure conduit section between the main control slide and the user. The main control slide is shiftably received in a bore which has a plurality of annular chambers arranged therealong. The main control slide has a plurality of lands separated by respective recesses, the lands, depending on the position of the main control slide, establishing or interrupting the communication between the respective chambers.

Abstract: A flow control valve is provided, especially for controlling the flow of water heated to near its boiling point. In order to limit cavitation and improve sealing characteristics of the valve, the valve seat is formed as an integral part of a plastic valve housing, on a thin inwardly protruding plate. The closure element or sealing body is formed of an elastomeric material stretched over a support plate, in turn attached to a movable plunger of, for example, an electromagnetic operated valve plunger. The closure element is formed as a tapered conical member which engages, with its tapered peripheral surface against the seating plate. Preferred embodiments of the invention relate to valve arrangements having an annular ventilating slit formed to open immediately downstream of the throttling point of the valve.

Abstract: A high capacity direct acting three-way bistable power operated valve is connected to control operation of an hydraulically operated magazine sprinkler control valve. The three-way bistable valve controls application of high pressure sea water and includes a slidable hollow valve spool having one end that is selectively seated upon and sealed against a valve seat in an inlet chamber, and having an intermediate spool portion connected to a common valve port. The other end of the hollow spool extends into an outlet chamber and is sealed against a valve seat therein when the first end of the spool is displaced from its valve seat and vice versa. Input pressure on the spool can be completely balanced or arranged to enhance sealing of the spool. The valve spool is axially shifted and latched either by a motor operated cam circuit arrangement or by driving and unlatching solenoids.

Abstract: A check valve with pilot actuation for hydraulic systems has a valve housing with a main bore and main seat, a main valve member movable in the main bore between a closed position and an open position and having an additional inner bore with a conical mouth at one end thereof, a pilot valve member movable between a closed position and an open position in said additional bore, and a push rod operative for moving the pilot valve member to the open position thereof. The push rod has a first thinner portion and the second thicker portion forming a shoulder. A conical transitional portion is formed between the above two portions and is complementary to the conical mouth of the bore of the main valve member. The push rod has pressure-relief clearances formed in the region of the transitional portion and the shoulder, and so located that when the transitional conical portion is seated on the conical mouth fluid in said additional bore can pass through the clearances.

Abstract: A plug or ball valve is disclosed having a housing and plug or ball in the housing for controlling the flow of fluid therethrough. A valve stem extends through the housing for rotation of the plug. The valve stem has a narrow peripheral shoulder which is held tightly against the housing by fluid pressure on the plug to prevent leakage past the seal when the valve is in a partially open position.

Abstract: A regulator for a damper assembly operable to control the flow of conditioned air through a supply duct. The regulator includes a pressure responsive member connected to the damper assembly to vary the position thereof within the supply duct in accordance with changes in the conditioned air supply pressure to maintain a substantially constant volume air flow downstream of the damper assembly irrespective of such changes. The regulator further includes control point setting means for obtaining the level of constant volume air flow including force generating elements acting in opposition to the pressure responsive member for providing a first force at a maximum level of constant volume air flow and for further providing a second force at lesser levels of constant volume air flow.

Abstract: A device for arresting the propagation of a crack, split or fracture in a pipeline comprises a cylindrical sleeve of greater diameter than the pipeline and having an annular and end plate fixed at each end thereof, the assembly thus formed being arranged to be positioned around the pipeline so as to define an annular space therebetween which may be filled with grout material of high compressive strength.

Abstract: A driving mechanism comprises a rotatable shaft (34), a drive arm (56) mounted on and rotatable with said drive shaft and having a swing end projecting radially therefrom on which a counterbalanced drive link (63) is rotatably mounted and arranged to rotate in a plane parallel to the plane of rotation of the drive arm, means (65,66,67,68,69) for rotating said drive link in a direction which is opposite to that of said drive arm, balance means (71) forming a part of said drive arm and rotatable therewith about said drive shaft so as to counterbalance the weight of said drive arm (56) and drive link (63) irrespective of the angular position of said drive link (63) relative to said drive arm (56) and a pair of flexible cables (W1,W2), each interconnected at one end with a driven element (C) to be reciprocated and each being secured at its other end with a fixed element (51,54) and the intermediate portions of said links being looped about pulley means (50) mounted on the swing end of said drive link (63) in such