Showing papers on "Bellows published in 1974"

Implantable pressure transducer

Abstract: A wireless, surgically implantable pressure transducer for measuring pressure of fluid or tissue in a body chamber such as brain ventricle of a patient suffering hydrocephalus or a severe head injury. The transducer includes a coaxial variable capacitor electrically connected across an inductor to form a parallel resonant L-C circuit. Alternatively, a coaxially variable inductor may be connected across a capacitor to form the L-C circuit. A bellows is mechanically connected to the variable component to vary the value of capacitance or inductance and hence the resonant frequency of the L-C circuit in response to pressure changes of the fluid in which the bellows is immersed. The transducer is electromagnetically coupled to an external source of variable-frequency oscillatory energy such as a grid-dip oscillator which enables external detection of the transducer resonant frequency which is in turn indicative of the level of fluid pressure being sensed.

Internally supported flexible duct joint

Abstract: An internally supported, flexible duct joint for use in conducting fluids under relatively high pressures in systems where relatively large deflection angles must be accommodated. The joint includes a flexible tubular bellows and an elongated base disposed within the bellows. The base is connected through radiating struts to the bellows near mid-portion thereof and to each of the opposite end portions of the bellows through a pivotal connecting body. A motion-controlling linkage is provided for linking the connecting bodies, whereby angular displacement of the joint is controlled and uniformity in the instantaneous bend radius of the duct is achieved as deflection is imposed thereto.

Temperature-controlled oven

Abstract: Inherent heating of the air in an oven by a high-velocity recirculating blower is used as constant rate thermal energy source. Constant temperature is maintained by varying the rate of blending of source of cooler air with the heated oven air. Automatic control of temperature is provided by a variable vent operated by a thermal expansion bellows. The bellows is slightly responsive to ambient temperature to compensate for variations thereof.

Fluid type accumulator spring with emergency back-up spring

Abstract: Accumulator or fluid spring or gas spring for use in supporting vehicles, e.g. railway cars, in combination with a back-up emergency spring: the accumulator includes a compressed gas filled bellows holding two plates apart; the back-up spring is a solid spring body that is prestressed; upon failure of pressure in the bellows, one of the plates presses against the already prestressed back-up spring and further stresses it, and the backup spring takes over the support function.

Blood collection device

Abstract: This device is for taking a sample of blood from a patient and dispensing a predetermined volumetric sample for analysis A blood collection needle is in fluid communication with the interior of a closed longitudinally collapsible container such as a bellows having substantially rigid ends The bellows is elastically compressed from its normally extended position to decrease the interior volume and it is temporarily secured in the compressed position Once the needle is in place for drawing blood, the bellows is manually released and its elastic extension assists in withdrawing a sample Samples from the device are dispensed by recompressing the bellows so that some of the blood overflows through a passage into a "ladle" in the top portion of the container A measured sample is then withdrawn by removing the cap from an outlet tube from the ladle A plurality of outlet tubes may be used for samples of different predetermined volumes If desired, an auxiliary sample can be withdrawn by way of a T adjacent the needle The T can be used for dispensing a sample without measurement or a controlled volume can be dispensed from another exit aperture in related embodiments

Traffic marker with resilient column

Abstract: A traffic marker in which an upright column carrying reflectors is supported in a molded rubber base. The traffic marker is comprised of a secure assembly of three resilient parts, each one of which is easily replaceable in case of damage. The upright column is a resilient tubing having a flared lower end. The molded rubber base has a slightly conical opening, with an annular recess on its under surface. A resilient rubber bellows is snugly received through the base opening, and snugly receives the flared lower end of the tubular column in its upper opening. The bellows functions as a hinge member, and also as a secure assembly member. The lower portion of the bellows is shaped as a frustum of a cone closely received in the base opening, said cone being provided with an external annular shoulder mating with the annular recess on the underside of the base, and providing positive location for the bellows. The upper portion of the bellows has an interior conical surface mating with the flared lower end of the tubular column, and an internal annular shoulder for seating the flared lower end of the column.

Rotary motion valve and actuator

Abstract: A valve in which a valve member is mounted for rotary valving motion within a valve casing and an actuator in which at least one pair of expansible bellows engaging opposite sides of a vane and acting in opposition one to the other give rise to rotary motion. The bellows preferably are free from any direct fixation to the vane or the like, and have a particular configuration as described.

Thermal interface for cryogen coolers

Abstract: An infrared receiver having a thermal conductive device for providing continuous thermal contact between a detector cooling means and an IR detector is disclosed. The thermal conductive device is bellows shaped and constructed from laminated layers of copper, nickel and copper or other suitable materials having the necessary thermal conductivity and elasticity at operating temperatures.

Thermostatic control for use in variable air distribution systems

Abstract: Air flow volume in a delivery duct is sensed in the form of changes in duct pressure and the sensed pressure is fed back to a diaphragm assembly which is part of a thermostatic control located in the room to which hot or cold air is being delivered. Dependent upon the sensed pressure, the diaphragm assembly throttles a bleed opening in the supply line of a pneumatic actuator, which actuator determines the position of a damper in the duct to thereby control the volume of air flow in the duct. A bellows is also part of the thermostatic control and senses room temperature to establish a spring force on the diaphragm assembly and against which the sensed pressure must act. The bellows is adjustable to afford room temperature selection. The bellows and a compression spring act on a master lever, the compression spring reacts against the bellows force. The combination bellows-spring produces movement of the master lever in two opposite directions and this movement is utilized to activate a control for continuously switching the system between delivery of cold or hot air. The thermostatic control includes a second lever moved in response to the bellows-spring movement. The position of the second lever establishes a biasing force against which, in the diaphragm assembly, the sensed duct pressure must act in establishing the position of the damper. A cam arrangement is associated with this second lever and is effective to determine the position, and movement, of the lever so as to provide selection in the percent of available air capacity which is utilized and/or lever movement between maximum and minimum limits as desired.

Game caller having diaphragm means, megaphone and bellows

Abstract: A game caller is shown including a diaphragm assembly that is vibrated in opposite directions by rapid bursts of air from a bellows. The only opening in the bellows is tubular and it is attached to one end of an elongated tubular housing where an end cap holds the diaphragm assembly onto the housing. The free end of the tubular housing permanently carries a cone-shaped megaphone forming a sound amplifier. A tubular cloth case has one end secured to the outer surface of the housing and the other end has a sewed pocket containing a drawstring. The case is utilized as a container for the bellows in a collapsed state for transporting the game caller. To prevent inadvertant operation, the closed end of the bellows may have an exhaust opening that is to be blocked during operation of the caller.

Measurement of the differential pressure of liquid metals

Abstract: The flow of liquid metal in a pipe is opposed by a magnetic-type liquid metal pump until there is almost zero flow shown by a magnetic-type flowmeter. The pressure producing the liquid metal flow is inferred from the rate of rotation of the permanent magnet pump. In an alternate embodiment, a differential pressure transducer is coupled to a process pipeline by means of hightemperature bellows or diaphragm seals, and a magnetic-type liquid metal pump in the high-pressure transmission line to the pressure transducer can be utilized either for calibration of the transducer or for determining the process differential pressure as a function of the magnet pump speed.

Oscillator system for paper machine

Abstract: Transverse oscillation of a paper machine doctor utilizes a liquid-driven actuator having a pair of opposed bellows chambers to produce the desired ''''to and fro'''' motion, with each chamber connected in liquid displacing relation with a corresponding two chambered pump driven by a rotary prime-mover.

Vacuum-operated sampler and distributor for multiple sampling operation

Abstract: The sampler includes a distributor with first and second members movable relative to each other in several specific positions. In each position a transfer port in one member is aligned with a different port in the other member. Each of the latter ports is connected to a separate sample receptacle, and the transfer port is connected to the intake line of a vacuum pump. A bellows and a valve are also connected to the intake line to the pump, and the valve is actuated to open and close at certain times relative to a cycle of operation in which the pump draws into the system a sample, which may be gas or liquid depending on the construction of the sampler. When the valve is closed, the pump draws air out of the bellows causing the latter to contract and operate an advancement device to align the transfer port with the next port in the other member.

Electronic vehicle speed control

Abstract: Disclosed is an electronic vehicle speed control with a fluid actuating means. Typically the actuating force is derived from the vehicle engine manifold vacuum applied selectively to a bellows operatively connected to the throttle mechanism. A dead-band type control is provided. When the actual vehicle speed is below the dead band range a valve is operated to allow the control fluid to increase the throttle setting. When the vehicle speed is above the dead band range a valve is operated to allow the control fluid to decrease the vehicle setting. In the preferred and specifically described circuit a circuit is provided to translate a contact closure rate into a D. C. voltage proportional to vehicle speed. A constant current source drives a series circuit including a speed set potentiometer and a dead-band setting resistor. The set speeds at either end of the dead band are compared to the actual speed and vacuum is "admitted" to or "dumped" from the bellows to return the actual speed within the dead band. Such a system provides very satisfactory control while affecting engine operation much less than a conventional vacuum powered vehicle speed control. Several novel safety and operational sub-circuits are also provided.

Altitude correction device for a carburetor and carburetor incorporating the same

Abstract: Additional air is supplied to an air-fuel mixer of a main mixture circuit of a carburetor. Bellows and metering valve are arranged so that a lost motion is provided until a predetermined altitude. The bellows is mounted in a barometric chamber which is connected so that the ambient air entering the engine carburetor ventilates the barometric chamber.

Vacuum lifting unit including a suction cup

Abstract: A vacuum lift is formed with an upper housing cover shaped portion having a central opening in which travels a vertically movable piston rod which has a piston disk at its lower end adapted to be selectively positioned to open or close an aperture in a suction disk having an encircling gasket. An enlarged evacuated volume is provided within the housing cover by expanding a plurality of diaphragm sheets into a bellows. The lowermost diaphragm sheet is connected directly to the suction disk and the uppermost diaphragm sheet is connected to and lifted by the piston rod to expand the bellows. The piston disk is formed with an air valve which is positioned by an automatic switching device operable with vertical movement of a draw bar positioned within the hollow piston.

Superheat control system

Abstract: A superheat control for a refrigeration system in which a switch is operated to provide a control function. The switch is operated by a pivoted arm with the arm being acted on by a first bellows on one side and a second bellows on the opposite side. The first bellows is responsive to the suction pressure to the compressor while the second bellows is responsive to the suction temperature.

Bellows type shorting switch

Abstract: A high current shorting switch wherein relatively movable contacts are surrounded by a flexible bellows which forms a hermetically sealed chamber, within which the contacts are disposed. The contacts are supported on heavy current carrying supports which terminate in two large end plates. Insulated holes are formed in one of the end plates which engage rods extending from the other plate to provide guidance for relative movement of the two end plates. An annular ring is disposed within the flexible bellows to prevent or limit current flow through the flexible bellows. The flexible bellows are coated with a protective coating which substantially increase the life of the bellows. The contact surfaces are preferably formed from a material having good weld break characteristics, such as copper bismuth while the contact supports and the end plates are formed from a material which is a good electrical conductor, such as copper. The high current, low voltage shorting switch is particularly adaptable for use in service with electrochemical cell switching for handling voltages of around 5 volts and current up to 5,000 amperes, singly. In combination a plurality of the disclosed shorting switches can carry any desired current.

Pressure responsive pilot valve

Abstract: A pressure responsive pilot valve for operating a differential pressure main relief valve of the bellows or diaphragm type mounted on a tank, wherein the main relief valve includes a deadended bellows or diaphragm and the pilot valve is connected between the bellows or diaphragm and the tank to selectively connect the bellows or diaphragm to tank pressure and maintain the relief valve closed or to connect the bellows or diaphragm to atmosphere and allow the tank pressure to open the main relief valve and relieve pressure within the tank. The pilot valve includes a casing, a movable pallet assembly in the casing having a magnet pressure pallet mounted on one end of a plunger and a blowdown pallet mounted on the other end of the plunger, a seat defining a pressure port and a magnetic member coacting with the magnet pressure pallet, a seat defining a blowdown port coacting with the blowdown pallet, said pallets being mounted on the plunger so that when one is seated closing its respective port the other is unseated opening its respective ports, a pressure chamber defined between the pressure port and the respective end of the casing, a blowdown chamber defined between the blowdown port and the presective end of the casing, an intermediate chamber between the pressure and blowdown ports, and connection ports in the casing for each of the chambers.

Waste oil burner

Abstract: A conduit is provided including inlet and outlet ends and a spray nozzle is supported from and closes the outlet end of the conduit. The inlet end of the conduit may be suitably communicated with any source of waste oil under pressure and the nozzle includes an inlet communicated with the interior of the conduit and a valve member is supported within the conduit from one end of a bellows member having its other end anchored stationary relative to the conduit. The bellows member is internally pressurized with a fluid under the desired pressure and the exterior of the bellows member is subject to the pressure of oil with the conduit. The internal pressure within the bellows member tends to extend the bellows member and position the valve member in position closing the inlet to the nozzle and when the pressure of waste oil within the conduit exceeds a predetermined pressure, the bellows member contracts and moves the valve member out of closing relationship with the inlet to the nozzle so that waste oil under pressure within the conduit may be expressed from the nozzle, suitable ignition being provided adjacent the outlet of the nozzle for igniting the waste oil discharged therefrom.

Pressure sensing system

Abstract: A system for use in connection with a flowmeter (volume flow rate), liquid level detector for a storage tank, a pressure indicator or otherwise. A pair of bellows assemblies connects a pressure source to a pressure sensitive instrument via conduit means including a detachable coupling. One bellows can be permanently (welded) attached to the pressure source. The instrument may be removed for service by uncoupling. The conduit means can carry two liquids separated by a bellows. One liquid may be NaK (a sodium and potassium mixture) which is used for radioactive applications and to detect the liquid level of a 1000°F. liquid sodium storage tank or the pressure or liquid level of a corrosive liquid. The other liquid can be an oil that transmits the NaK pressures to the pressure sensitive instrument. The detachable coupling is a double-seal type (both halves automatically close), and is placed in the oil-filled conduit. The oil-filled conduit is not subjected to high temperatures.

Method of securing tubular bellows to a cylinder

Abstract: A yieldably resilient, tubular bellows is fastened to a metal cylinder by first inserting an axial end portion of the bellows in a more rigid clamping ring whose internal cross section is greater than the cross section of the cylinder, but not substantially greater than that of the outer cross section of the bellows, then axially juxtaposing the bellows and the cylinder, and exerting axial pressure in opposite directions on the ring and the cylinder while preventing the bellows from moving out of the ring until an axially terminal portion of the cylinder enters the bore of the bellows, smaller in cross section than the cylinder, and is axially coextensive with the ring, whereby the bellows is radially compressed between the ring and the cylinder.

Double disc seal valve

Abstract: A double disc seal valve provided with two independently operable disc valves, a double bellows pressure sealing system sealing each disc valve protected from the erosive action of solids or entrained solids flow, and an interdisc chamber that is pressurized to form an aerodynamic or hydrodynamic seal to provide additional seal of high pressure, high temperature, erosive solid or fluid flow systems. A control system is provided which sequences the operation of the disc valves, pressurization of the bellows system and pressurization of the interdisc chamber on closing, and releases the pressure from the bellows system and interdisc chamber and then opens the disc valves upon opening the valve.

Hydropneumatic pressure storage device

Abstract: A hydropneumatic pressure tank, whose housing consists of a bottom part and of a top part which are connected with each other by a welded seam; a retaining ring is arranged at the inner wall of the tank within the area of the welding seam, at which is secured the bellows serving as movable partition wall; at least the part of the retaining ring opposite the welding seam thereby consists of a layer rejecting the welding material.

Doll with pneumatic means for reciprocally moving eyes

Abstract: A doll has an air bladder mounted therein which can be squeezed to pneumatically actuate a bellows. The bellows is mechanically coupled to a slider mechanism which is reciprocally driven as the bladder is squeezed and released. Movable doll eyes are coupled to the slider mechanism and thus are moved back and forth with each squeezing and releasing of the bladder.

Method and system for growing monocrystalline ingots

Abstract: A monocrystalline silicon ingot is grown from molten silicon by progressively lifting a monocrystalline seed from the molten silicon, which is disposed within a crucible in a furnace, through mounting the seed on a graphite pull shaft. The pull shaft is surrounded by a bellows, which is connected to a carriage to which the pull shaft also is connected. A seal, which is carried by the bellows structure, seals the pull shaft in its rotary motion. Because the bellows structure and the pull shaft are both connected to the carriage, there is no relative linear motion therebetween so that there is no necessity to seal for linear motion of the pull shaft. A pair of lifting mechanisms is connected to diametrically opposite sides of the carriage to support the carriage and to exert a lifting force on the pull shaft along its longitudinal axis. The crucible also must be raised as the level of the molten silicon is depleted due to the formation of the ingot on the seed at the end of the pull shaft. This is because there is an optimum heating zone, which is an isothermal zone and is relatively small, within the furnace, and it is necessary for the level of the molten silicon to be maintained within this zone. The crucible is lifted through being connected to a carriage, which is supported and lifted by a similar arrangement to that for lifting the carriage to which the pull shaft is connected.

Fluid sensing systems

Abstract: A pair of vertically spaced bellows are employed with output means to produce a D.C. voltage directly proportional to the movement of the free end of one bellows. A conduit connects the two bellows together. The conduit and both bellows are filled with an incompressible fluid. The fixed ends of both bellows are fixed relative to each other. This arrangement may be employed with a D.C. voltmeter calibrated in linear measure to indicate the level of a liquid in a storage tank. In this case, one bellows is located inside of and fixed relative to the tank at the top. The other bellows is located inside the tank at the bottom and fixed relative thereto thereat. A two bellows densitometer is also provided which may be employed with or without the liquid level system.

Variable Venturi type carburetor

Abstract: A variable Venturi type carburetor is provided with an air chamber arranged between a fuel metering orifice and Venturi section and being in communication with the Venturi section through a second orifice, said air chamber being connected to an air passage which is in communication with both the interior of an air cleaner and atmosphere for introducing a compensating air into the air chamber The aforesaid air passage has an air metering means consisting of an orifice and a needle The needle is connected to a bellows which is expansible in response to the atmospheric density so that the needle can control, in cooperation with the associated orifice, the quantity of compensating air to be fed into the air chamber in response to the atmospheric density for obtaining a desirable air/fuel ratio Since the compensating air is supplied from inside the air cleaner and from atmosphere in a predetermined proportion, desirable air compensation can be effected over the entire range of engine operation from a high speed range to a low speed range

Tire removal apparatus

Abstract: This invention relates to apparatus for removing tires, particularly heavy duty tires as used on goods vehicles, from circumferentially-separated rims, said apparatus being of the kind in which two pressure arms fitted with shoes arranged to apply pressure to the tire for pressing it off the wheel rim when the latter is resting on a rim support, are hinged in mutuallyopposed positions to an upper cross beam. According to the invention, an upright pillar comprising upper and lower parts is arranged on a pedestal plate, the upper part of said pillar being attached to the centre of the cross beam between said pressure arms and said rim support being mounted on the lower part of said pillar so as to be axially displaceable thereon. A bellows expandable in the direction in which the said rim support moves by supplying compressed air to said bellows is attached to said rim support and also to said pedestal plate.