Abstract: A lock stitch sewing machine having a rotary loop taker adapted to carry a loop of thread about a stationary bobbin thread case. The bobbin thread case is restrained from rotation by a finger which is disposed between abutments in the bobbin thread case for opening a passage to allow the needle thread loop past the bobbin thread case rotation restraining means, the rotation restraining finger is vibrated at a frequency greater than four cycles per rotation of the loop taker.

Abstract: Methods of making feminine hygienic pads from non-layered and layered material by use of folding to make predetermined multiple folds in said material, said folding may be with a device attached to a sewing machine for stitching said pads longitudinally adjacent a longitudinal leading edge creating an anterior narrow leading panel of narrow thickness and a posterior under panel of a wider thickness providing a long geometric form. Thereafter the said long geometric form is multiple cut providing pads of about two inches long. In some pads having fillers, the filler material is laid between the folds of the layered or non-layered material prior to stitching and after the long geometric form is produced, it is cut into desired lengths about two inches long providing the pads. These pads are for insertion into the interlabial space and have a geometric configuration which facilitates insertion of the pad into the interlabial space and has improved retention within such space.

Abstract: A portable, floating dock which can be towed by a boat using same is provided. The dock has a flat shell with a tapered front section and a gang plank covered with a non-skid material. An eyebolt is provided in the back of the float for securing a boat to it and to stakes driven on the shore. Anchoring tie rings are also provided in the front of the dock for securing same to other stakes driven on the shore.

Abstract: An improved device for generating an ultrasonic signal for use in an area protected by an alarm actuated by an ultrasonic signal. The device includes a tuned, acoustic rod within a cylinder typically about the size of a pen adapted to be worn in a shirt pocket. The device has a spring-actuated hammer which is movable, when triggered, into engagement with the rod to generate an acoustic signal. When the hammer is cocked, it is held in a cocked position by two spaced triggers which must be actuated simultaneously to release the hammer to cause it to move toward and to strike the rod. The cylinder has an opening for indicating the fact that the hammer has been triggered. The device is made so that it cannot be re-cocked without special equipment not available to the public.

Abstract: Disclosed is a novel and improved magnetic separator or filter, as well as an apparatus for making such a magnetic separator. Each filter cell comprises a base plate and a plurality of fibrous filter elements made of magnetizable material and secured to the base plate. The filter elements extend in a mutually parallel spaced relation and substantially perpendicularly to the direction of flow of the fluid and to the plane of the magnetic field.

Abstract: Disclosed is an apparatus for developing electrophotographic copying materials which eliminates the damage to flexible copying materials encountered with conventional developing apparatus. This apparatus comprises a pair of feed rollers for applying toner dispersion to the copying material, a guide plate for supporting the copying material within the apparatus, a distributor element for the toner dispersion which acts as a counter-electrode, means for adjustably positioning the distributor element in parallel relation above the guide plate, and a pair of squeegee rollers for removing excess toner dispersion from the copying material.

Abstract: This invention relates to a vaporific carburetor for a gasoline engine, consisting of an evaporator tube assembly inclined to the horizon, an auxiliary fuel tank assembly at the upper end of the evaporator tube assembly, a mixer tube assembly at the lower portion of the evaporator tube assembly and an auxiliary water tank connected by a small water pipe to the upper portion of the evaporator tube assembly.The vaporific carburetor differs from the vaporizer carburetor in four different aspects. The first difference is in the cut at the outlet of the high speed tube, and the position of the cut with respect to the venturi. In the vaporizer carburetor the said cut is perpendicular to the wall of the venturi while in the vaporific carburetor the said cut is parallel with the wall of the venturi. The second difference is in the connection of the inlet of the idling speed tube.

Abstract: Emission control apparatus for internal combustion engines is provided with a sensor for detecting the concentration of a particular exhaust composition in the emissions from the engine. A signal indicating the deviation of the mixture ratio from a controlled point is generated by comparing the output from the sensor with a reference level, the signal being modified in amplitude according to a predetermined control characteristic and used to regulate the air-fuel mixture ratio at the desired control point. The varying magnitude of the sensed concentration is smoothed into a signal of slowly varying magnitude which is used to control the reference level so that error introduced into the deviation indicating signal due to the change with time in the output performance of the exhaust composition sensor is self-compensated. A level sensor is provided to detect when the reference level reaches an end of the control range to change the operating mode of the engine from closed-loop to open-loop mode.

Abstract: An internal combustion engine operation timing control uses a programmed read only memory to produce a multibit digital signal used to determine the instant of operation. There are two inputs to the ROM, one of which is from a speed counter and the other of which is from another engine parameter transducer. The digital output of the ROM is applied to a timing counter for conversion to a time duration by clocking out timing pulses. The same master clock is used for clocking both the speed counter and the timing counter, a frequency divider programmed in accordance with the 3MSBs of the speed counter is used to reduce the clock frequency as the count in counter increases during speed computation, the same divisor remaining in action during the timing operation.

Abstract: A piston for internal combustion engines which is cooled by means of splash oil, and in which the piston interior space is closed off by a collecting trough arranged at the lower end of the piston and provided with an opening for the passage of the connecting rod.

Abstract: The invention relates to the safety against shocks in a free piston machine.The engine section of a unit operating according to the Diesel cycle and air-cooled runs the risk of supplying an important amount of energy to the piston, so that the latter might knock against the cover of the bounce cylinder or chamber. The constructional elements (stroke and diameters) of the machine are calculated in a manner such that their ratios cause, as a result of expansion, the ignition to stop before the dead point on the bounce section side (curve 12) knocks against the cylinder.Application: compressor with 2-stroke Diesel engine, having a one-piece movable member, and air-cooled.

Abstract: A mixing apparatus for fuel and oil to be supplied on demand to an internal-combustion engine. An oil reservoir separate from a fuel tank is provided with an expandable chamber assembly and a positive displacement pump which are jointly operated in an opposed tandem relationship. The chamber assembly is used to supply mixed fuel and oil on demand to the engine fuel intake. The positive displacement pump draws measured amounts of oil from the reservoir during each stroke cycle and injects this measured amount into the incoming fuel in the chamber assembly. As one moves through its suction stroke, the other moves through its delivery stroke. The ratio between the volume displacement of the pump relative to the volume displacement of the expandable chamber assembly is equal to the desired volume ratio of oil to fuel at the engine fuel intake. The oil and fuel are thoroughly mixed as they are delivered from the apparatus.

Abstract: A two-stroke piston engine and method in which oil-free air is mixed prior to ignition with oil-free fuel, by means of a venturi. The engine is lubricated by utilizing the pressure which the piston exerts in the crankcase to draw an air-oil mix into the crankcase and then to push the air and oil out while filtering the air with a rotary filter, to return the oil to a suitable reservoir, the oil-free air being sent to the venturi. Fuel enrichment, as for cold starting, is caused by placing air pressure on a fuel-containing bowl ahead of the venturi so as to increase the flow of fuel into the venturi, rather than by reducing the amount of air as is done with a conventional choke plate.

Abstract: Apparatus for preventing overspeeding of an engine is provided. In preferred embodiments, an hydraulically actuable clutch is controlled by a piston-cylinder arrangement connected to a driver operable clutch pedal. The rear side of the piston in this arrangement is selectively communicated with a high pressure air source and an exhaust space by means of a solenoid valve. The solenoid valve is controlled by a tachometer switch so that the same communicates the high pressure medium to automatically actuate the disengagement of the clutch whenever a predetermined set engine speed is exceeded. The pressure medium space at the side of the piston is also communicated with a further piston-cylinder arrangement for automatically forcing an engine accelerator pedal toward a no-load engine running condition at the same time the clutch is automatically disengaged. An emergency switch is provided for overriding the clutch disengaging apparatus so as to accommodate intentional usage of the engine as a brake.

Abstract: An electronic control for an internal combustion engine, and for precisely controlling the instant at which the ignition sparks are emitted. It is fitted with an electronic contact breaker and with sensors for measuring physical parameters characteristic of the conditions under which the engine is operating. This control comprises two channels whose operation is mutually exclusive, namely a first channel which operates when the engine is started and is idling, and a second channel which operates when the engine is running at high speed and under load.The control is applicable to electronic ignition systems for internal combustion engines with controlled emission.

Abstract: The spark advance control apparatus of the invention comprises a vacuum advance control mechanism and a speed advance control circuit. The vacuum advance control mechanism senses the vacuum pressure in the intake manifold of an internal combustion engine and generates an electrical pulse in advanced timing in relation to the sensed vacuum. The speed advance control circuit receives the pulse from the vacuum advance control mechanism, converts it into a voltage signal representative of the revolution of the engine crankshaft and generates an output voltage which varies nonlinearly as a function of the voltage signal. A pulse-width generator is provided having a first input connected to receive the pulse from the vacuum advance control mechanism and a second input connected to receive the nonlinear speed related voltage signal to generate a pulse which commences in response to the vacuum advance pulse and ends at a time determined by the speed related voltage signal.

Abstract: An exhaust gas recirculation apparatus of the so-called exhaust gas pressure control type, including, in combination, a vacuum-operated pressure control valve adapted for controlling the pressure of the exhaust gas in the exhaust gas recirculation passageway connecting the exhaust manifold to the intake manifold, and a vacuum control valve adapted for controlling the level of the vacuum signal transmitted to the pressure control valve, for obtaining a predetermined constant pressure in the exhaust gas directed to the pressure control valve. A flow control valve is provided for controlling the amount of exhaust gas directed to the pressure control valve in accordance with the load of the engine. The flow control valve has an exhaust gas passageway with a constant flow area, and another exhaust gas passageway with a flow area that is varied in accordance with the load of the engine.

Abstract: An exhaust gas purification system for use in an internal combustion engine equipped with a dual exhaust system. The exhaust gas purification system includes a secondary air supplying port of a secondary air supplying passage opened into selected one of a first or second group of exhaust pipes, while an exhaust gas deriving port of an exhaust gas recycling passage for recycling the exhaust gases to an upstream of the carburetor throttle valve is provided in the exhaust line at a downstream from the above secondary air supplying port for effective suppression of NOx through accurate control of the amount of exhaust gases to be recycled.

Abstract: A closed loop exhaust gas recirculation (EGR) control system for an internal combustion engine having an intake system, an exhaust system, a throttle disposed within the intake system for controlling air flow therein, a conduit coupling the exhaust system to the intake system for supplying exhaust gas back to the intake system for controlling the generation and emission of oxides of nitrogen and for improving drivability and avoiding engine roughness. The EGR control system of the present invention includes a first memory pre-programmed with a look-up table of optimal EGR values indicative of EGR valve position or the like determined as a function of engine speed and throttle position and a second memory pre-programmed with the look-up table of optimal EGR values determined as a function of engine speed and absolute manifold pressure.

Abstract: A turbocharged internal combustion engine has a carburetor fuel metering control rod, an ignition timing control member, an exhaust gas recirculation control pintle, and an induction air temperature control damper operated in a response to vacuum signals created by the pressure in the induction passage between the throttle and the turbocharger compressor and a valve which bleeds the vacuum signals to atmospheric pressure when the compressor discharge pressure rises above a selected value to establish a rich air-fuel mixture, retard ignition timing, inhibit exhaust gas recirculation and provide cool induction air flow for maximum power operation.

Abstract: A motor vehicle combustion engine has an exhaust gas recirculation system in which the flow of recirculated exhaust gas is controlled through an orifice having exhaust back pressure on one side and a control pressure on the other, determined by an EGR valve. Apparatus is provided for sensing the control pressure and controlling the EGR valve in response to the sensed control pressure, a predetermined desired control pressure and a reference. At selected occurrences of engine idle, the EGR valve is closed and the sensed control pressure, which at such times is substantially the same as the exhaust back pressure at idle, is stored for use as the reference between said occurrences.

Abstract: Two thermally operated control valves which, in cooperation with each other, admit into the vacuum chamber of the diaphragm unit for the EGR control valve atmospheric air only during cold engine operation, both atmospheric air and engine suction vacuum during engine warming-up operation, and engine suction vacuum only during engine normal operation.

Abstract: A fuel injection system for an internal combustion engine employs a relatively low pressure pump to provide fuel to injectors located at the engine cylinders. A booster device for maintaining the fluid pressure constant, at a substantially higher level, is connected in series with the line between the pump and the injector and includes one way valves at its inlet and outlet. The booster employs a chamber connected to the fuel line and pressurized by a piston which acts to contract the chamber volume under the force of the coil spring. The piston is cocked against the spring at regular intervals to renew the original volume of the chamber by an arm driven from the engine crankshaft. Sealed volume converters having flexible diaphragm walls are disposed adjacent to the inlet and outlet of the booster device and in the fluid conduit adjacent the injectors to obviate sharp drops in the fluid pressure in the fuel line when the injectors actuate.

Abstract: An improved fuel pump construction including a driven shaft having cams thereon for actuating a fuel pump for internal combustion engines, a driving shaft adapted to be driven by an engine proportionally to engine speed, the shafts having aligned, splined ends in close adjacency with the lead of the splines on the ends being dissimilar. A splined coupling interconnects the ends and is axially movable thereon and rotatable with the shafts. A collar rotatably receives the coupling and restrains the coupling against axial movement. An adjusting mechanism including a manually and selectively operable actuator is provided for axially adjusting the position of the collar and for holding the collar in a desired position of adjustment. By reason of the dissimilar lead between the splines, movement of the collar, and thus the coupling, will change the angular relationship between the two shafts so that precise timing can be achieved without disassembling the mechanism.

Abstract: A fuel injection pump for an internal combustion engine having an engine speed responsive governor for adjusting the metering valve of the pump. In order to control the idle speed of the engine under varying temperature conditions a bimetal spring is interposed between the governor and the idle spring. The governor spring assembly includes a preloaded compression spring which prevents the governor from controlling the metering valve above the idle speed range until a predetermined speed is reached.

Abstract: A cylinder with cross inlet and exhaust ports contains a combination piston and rod having on its piston end a piston head or face and slidably attached sealing sleeve, and its other end is rotatable via a rod bearing attached to a crankshaft. The rotational motion of the rod with the crankshaft imparts an undulating movement to the piston head during its stroke motion and, in unison with the slidably attached sealing sleeve, effects a sequence wherein the exhaust ports open ahead of the inlet and close before the inlet closes.

Abstract: A cylinder head of an internal combustion engine is formed with concavity. Two flat protruded portions are formed on the spherical surface of the concavity and their planes intersect each other at a location slightly below the vertex of the spherical surface. At the two flat protruded portions, intake and exhaust valve seats are disposed. A combustion chamber is defined by the spherical surface, the surfaces of the flat protruded portions and the piston crown.

Abstract: An engine is provided having a pair of cylinders, the cylinders being arranged in the shape of the letter V on the crankcase, whereby partially enclosed spaces are formed between the cylinders, and between the cylinders and the crankcase. Engine auxiliary components and fittings, including an air cleaner, a carburetor, a self-starter, an accelerator mechanism, an oil filter, an oil gauge and a lubricant orifice are mounted in said partially enclosed spaces to provide an engine assembly of minimum size in which the auxiliary components are relatively protected from damage.

Abstract: A signal indicating device for an internal combustion engine. The internal combustion engine has a sound absorbing shell surrounding the engine body. An air intake pipe is mounted on the engine and an air intake filter is mounted on the inlet end of the air intake pipe. The signalling device is provided to indicate the degree of contamination of the air filter. The signaling device can be a visual signal or an audible signal.

Abstract: Variable displacement type lubricating oil pump for two cycle engines having a displacement control element which is rotated in response to the engine throttle valve position. The control element has a cam which is so shaped that the pump displacement is changed in accordance with the engine throttle valve position. When the control element is accidentally disconnected from the engine throttle valve control device, the control element can be rotated beyond the minimum displacement position which corresponds to the engine idling position, whereby the pump displacement is increased than in the idling position.

Abstract: An ignition system means for a rotary piston engine having a leading and a trailing ignition plug and incorporating an exhaust gas recirculation system. A control circuit is disclosed which selectively stops or delays the sparking operation of the trailing ignition plug only when the three conditions are simultaneously satisfied: that the throttle opening is in a medium range for effecting a low load operation of the engine; that the engine rotational speed is below a predetermined relatively low value; and that the exhaust gas recirculation ratio is below a predetermined relatively moderate value.

Abstract: The present invention provides a heating appliance which comprises a combustion chamber, a boiler adjacent the combustion chamber, and a flue system for conveying combustion gases from the combustion chamber. The flue system has two different routes for conveying combustion gases and a damper which may be selectively positioned to cause the gases to pass predominantly along either one or the other route. This arrangement permits the heat output to the boiler and an associated cooker unit to be varied while a constant firing rate is maintained in the combustion chamber. The applicance is preferably operated on solid fuel.

Abstract: A fireplace heating system is provided having a fireplace box having a fireplace opening therein, a heat chamber surrounding said box, a plurality of spaced generally vertically extending flues connected to said fireplace box and holding said box suspended generally centrally of said heat chamber, said flues being adapted to carry the exhaust gases from the fireplace box, a hot air distribution duct connected to said heat chamber and surrounding the said flues over a portion of their length, said distribution duct having discharge vent means into the room being heated, a pre-heat chamber spaced from the heat chamber and the hot air distribution duct and surrounding said flues over a second portion of their length, a cold air inlet connected to said pre-heat chamber, a blower connected to said pre-heat chamber on the side of the pre-heat chamber opposite the cold air inlet receiving preheated air passing around the second portion of said flues from said pre-heat chamber for delivery to the heat chamber and chi

Abstract: In a method for splicing cables, a first cable is connected to a second cable to form a junction and a heat shrinkable sleeve is positioned over the junction. A portable hot pack having properties for developing a temperature in excess of 250.degree. C. is conformed around the sleeve to shrink the sleeve around the junction and thereby seal and insulate the junction. The hot pack can include first and second chemicals which react to initiate a series of heat producing reactions which occur at different temperatures to incrementally elevate the temperature of the hot pack.

Abstract: A solar collector including at least one evacuated transparent cover tube provided with means for supplying hydrogen to and extracting hydrogen from the cover tube.

Abstract: The solar heater comprises an elongate concave reflector having a reflecting surface consisting of two interconnecting portions which are substantially symmetrical about a longitudinal plane of the reflector. Each portion in section is of substantially compound parabolic curvature. A heat absorbing device is disposed within the space defined by the reflector substantially symmetrically about said longitudinal place. The heat absorbing device includes a duct for receiving and conveying a heat transfer medium, said duct having surfaces in the form of plates extending laterally of said plane towards side regions of the two portions. Side plates extend downwardly from the distal edges of the laterally extending plates.

Abstract: Solar energy collectors, devices and systems utilizing selective solar absorbers for more efficient collection of radiant energy from the sun and its conversion to useful form at relatively high heat transfer temperatures. Each collector unit is made up solely of a closed shell-like enclosure having a continuous, unpenetrated boundary wall evacuated and hermetically sealed to form a structurally strong radiation collecting chamber whose boundary wall surrounds a rarified atmosphere environment such as a vacuum, the wall having a window portion which transmits substantially all of the received solar spectrum to a selective solar radiation absorber in the chamber and energy derived therefrom is collected at any energy collecting and transferring portion of the wall from which heat is conducted to the exterior.

Abstract: The present invention consists of a novel solar liquid vaporizing chamber for receiving liquids for vaporization. Hot vapors are released from the chamber and piped to desired locations while additional liquids are introduced into the chamber for vaporization.

Abstract: A flat plate hydronic solar collector combining features of both the trickle and pressurized type of collector and also of metal and plastic collectors, the invention consisting of a plastic film tube divided into pockets into which heat transfer liquid flows by gravity, moving through a multiple number of pockets as the liquid progresses through the tube, removing heat from the side of the tube facing the sun, the pressure in each pocket being limited by the depth of the pocket. An important embodiment of the invention has a metal solar energy absorber plate secured over the film tube and its mounting surface so that the swelling of the film tube causes it to make extensive contact with the metal absorber.

Abstract: A solar collector utilizing elongated channel-shaped reflector members which comprise modified parabolas in cross-section to reflect sun rays onto straight sections of a tubular conductor of heat-transfer fluid located substantially along the focal lines of said reflector members and being oval in cross-section to intercept the rays of the sun as the position of the sun rises above and falls below the central axes of said reflector members, a series of said reflector members and conductors being horizontal in use for gravity drain and flow and the ends of the straight sections being connected to provide a sinous tube system. An insulating frame supports said reflector members and tube systems and a transparent cover extends across the outer face in use.

Abstract: Apparatus for effecting a timed recirculation of the hot water in a water distribution network such as for an apartment complex. A recirculating pump is responsive to a drop in pressure in the hot water output line of a water heater and provides recirculation of the water in the hot water lines from the remote apartment locations for a timed interval. After the timed interval, and after the system has returned to the starting pressure, the recirculating pump is again ready for operation at the time of the next use of the hot water in the system.

Abstract: Birth control apparatus and method characterized by a ring, adapted to be inserted through the male urethra, and placed in the bladder neck sphincter to maintain same open. During ejaculation, seminal fluid is discharged into the bladder and voided therefrom at a later time. In a preferred form, the ring is contracted to sufficiently small size to permit it to be inserted through the urethra and, after being placed in the sphincter, expanded to larger size, locking same against unauthorized movement therefrom.

Abstract: The device is comprised of a guide tube having an inner end cutting edge and during insertion, carries a stylet to prevent the collection of blood and skin tissue. Adjustable guard means are on the tube for predetermining and limiting the depth of entry. After the tube has been inserted to the proper depth, the stylet is removed and a hollow needle is inserted through the tube and the bone structure into the marrow cavity to obtain a marrow sample. There are means on the needle to provide for the predetermined and limited depth of entry of the needle and motor means are provided to rotate the needle to cut through the bone and enter the marrow cavity to obtain a marrow sample. In addition after the needle has been removed, the guide tube is adapted to penetrate the bone and be moved into the marrow cavity, at which time aspiration means are connected to the outer end of the tube to aspirate marrow into the aspiration means.

Abstract: A sphygmomanometer pressure release means, i.e. a means for releasing the pressure in the pneumatic cuff thereof by simple bending pressure applied to the tubing extending from the "squeeze" bulb to the pneumatic cuff and at a point along the tubing adjacent the squeeze bulb.

Abstract: A massager which comprises a resilient massaging roller, the periphery of which is studded with flanged protuberances, the roller being removably mounted for rotation on spaced upright members secured to a base member or platform, the latter being movable back and forth by the user to position and manipulate the roller during the massaging operation.

Abstract: Improvements in devices for reclining the incumbent human body in an inclined, head-downward position; improvements in foot-ankle suspension systems for use in such body reclining and inclining devices; improvements in hand operated mechanisms permitting the user of the device to control the rate and degree of recline in such devices; locking means for releaseably securing the device in horizontal and fully inclined positions.

Abstract: Electrostatic soft tissue wound repair enhancement is provided by means of a self-contained, non-invasively applied bandage arrangement comprising one or more electret elements each providing a small electrostatic field to the particular wound area. The self-contained, wafer-thin bandage may take the form of a sterile, disposable self-adhering band-aid like structure, a surgical sponge or a closely fitting article of clothing.

Abstract: A pediatric arm restraint is disclosed for restricting movement of an infant's arm at the elbow. The restraint includes an inner foam pad and an outer stiff rigidifying plastic sheet, the foam pad preferably being the larger of these two components to extend beyond the edges of the plastic sheet for comfort to the infant. Both the pad and the sheet taper from a major edge to a minor edge to facilitate forming the restraint into a conical shape for use, with the major edge being adapted for placement in an infant's axilla and the minor edge fitting below the infant's elbow. The restraint is normally flat for ease in shipping and handling, but is easily bent into a generally tubular configuration, preferably a tubular-conical configuration, around an infant's arm and then secured in that position by Velcro strips.

Abstract: A flow control device for controlling liquid flow, especially a liquid being fed intravenously to a hospital patient. A membrane is deflected in the housing so as to cut off liquid flow when the supply input decreases, thus avoiding the possibility of air being introduced into the system.

Abstract: A cassette is described for use in an intravenous delivery system having a pump. The volume of a main chamber defined by the cassette body is varied by a membrane in a wall thereof while unidirectional inlet and outlet valves maintain the direction of fluid flow into and out of the main chamber. A prechamber is positioned above the inlet port in order to accumulate air from the upstream portion of the intravenous delivery system in which the cassette is used.