Showing papers on "Bellows published in 1989"

Flexible double-containment piping system for underground storage tanks

Abstract: A double piping system connected between an underground storage tank and an above-ground liquid dispenser, e.g. gasoline, provides containment to prevent the pumped liquid from leaking from the underground piping system into the environment. The piping system can be tested or replaced from grade without excavating or breaking ground at the installed tank site. Particularly advantageous assembly and disassembly of the system is provided by a coupling that involves cooperation between a bayonet-type quick-disconnect coupling for the primary piping and a bellows for the secondary piping. The bellows retracts to provide access to the quick-disconnect fitting for replacement of the inner piping. When extended, the bellows is sealably connected with a containment piping coaxial with the primary piping, so as to provide an annular containment volume around the quick-disconnect coupling.

Pump cassette and method of pumping

Abstract: A medical pumping system has a supply tube (2), an outlet tube (6), a readily sterilizable, disposable cassette (3) connected to the tubes and engaged with the pump, and means (22,24) such as a motor-driven piston, for intermittently applying pressure to the cassette. The pumping system features a display and switch means (9, 10) on a front panel thereof, a pressure sensor (28), an optical fluid presence sensor (19), and a microprocessor (20) metering the volume of fluid pumped through said cassette (3), monitoring output signals from said sensors (18, 28), controlling the motor-driven piston in accordance with settings entered via said switch means (9,10), and directing output data to said display means (8). The microprocessor has a stored program for performing SET RATE, RUN, HOLD, VOLUME FED, and CLEAR VOLUME functions. The cassette includes a hydraulically self-actuating inlet valve (44) communicating with the supply tube (2), a hydraulically self-actuating outlet check valve (42) communicating with, and preventing backflow from, the outlet tube (6), a hollow, resilient compressible member, such as a bellows (34) having an interior communicating with the inlet and outlet valves, and a support structure (30,36,38) securing together the tubes, valves and bellows in operating relation. Preferably, the inlet and outlet valves are a unitary element.

Excretion absorbing-and-holding device

Abstract: A device for the collection of bodily excretion having an expandable storage member in the form of bellows. The bellows having a minimum size prior to excretion, but increase in volume with the increase of waste liquid or solid passed from the body, thereby assuring that such waste liquid or solid is contained in the expandable storage without leakage no matter how much excretion may be discharged. The device has a guide strip for directing the flow of the excretion toward the expandable storage member at its rear part. The guide strip is made of a mass of spongy material compressed in the form of a thin sheet. It is effective to absorb and collect the excretion quickly by enlarging and restoring to its initial stress-free volume.

Disk scanning apparatus for batch ion implanters

Abstract: A mechanical scanning system for a batch ion implanter includes a disk (40) for mounting wafers (39) at sites (42) near its periphery and a disk drive assembly (50) for rotating the disk (40). The disk (40) and the disk drive assembly (50) are supported in an end station vacuum chamber (30) by a scan arm (44) which extends through a sealed opening (64) in an access door (60). A scan drive assembly (52) attached to the access door (60) scans the scan arm (44) and the disk (40) in an arc-shaped path. Simultaneous rotation and scanning of the disk cause the ion beam (20) to be distributed over the surfaces of the wafers (39) mounted on the disk (40). A pivot drive assembly (54) rotates the scan arm (44) and the disk (40) about a pivot axis (C) between an implant position and a load/unload position. A bellows (102) seals the scan arm (44) to the vacuum chamber (30) while transmitting arc-shaped movement into the vacuum chamber (30). A bellows guide apparatus guides an intermediate portion of the bellows so as to limit lateral distortion caused by pressure differences applied to the bellows in the combination with asymmetrical deflection thereof.

Slant plate type compressor with variable displacement mechanism

Abstract: A slant plate type compressor with a capacity or displacement adjusting mechanism is disclosed. The compressor includes a housing having a cylinder block provided with a plurality of cylinders and a crank chamber. A piston is slidably fitted within each of the cylinders and is reciprocated by a drive mechanism which includes a member having a surface with an adjustable incline angle. The incline angle is controlled by the pressure in the crank chamber. The pressure in crank chamber is controlled by control mechanism which comprises a passageway communicating between the crank chamber and a suction chamber, a first valve device to control the closing and opening of the passageway and a second valve device to control pressure in an actuating chamber. The first valve device includes a bellows valve element and a valve shifting element. The valve shifting element of which one end is exposed in the actuating chamber is coupled to the bellows to apply a force to the bellows at another end and thereby shift a control point of the bellows in response changes in the actuating chamber pressure.

High-temperature, flexible, thermal barrier seal

Abstract: This device seals the sliding interfaces between structural panels that are roughly perpendicular to each other or whose edges are butted against one another. The seal is mounted in a rectangular groove in a movable structural panel and comprises a plurality of particles or balls densely packed in an outer sheathing. The balls are laterally preloaded to maintain sealing contact with the adjacent wall using a pressurized linear bellows. Distortions in the adjacent panel are accommodated by rearrangement of the particles within the outer sheathing.

Fan coil unit

Abstract: A fan coil unit includes a coil supported above a primary pan defining therebetween a gap which is closed by a thin flexible water impermeable bellows which prevents air from a fan from being blown through the gap and instead directs the air through the coil. The primary pan is in situ molded with rods therein for reinforcement and also includes upstanding motor mounts which prevent faster corrosion.

Cryocooler cold head interface receptacle

Abstract: Demountable cryocoller cold heads must make reliable contacts having low thermal resistance at cryogenic temperatures for cooling such devices as radiation shields used in superconducting magnets. Cryostat vacuum and a bellows is utilized in order to engage the cold head second stage interface, while the first stage interface is independently engaged by means of a bolted flange and a bellows. A soft metal such as indium is employed at the contact surfaces of the heat stations.

Marine propulsion unit universal drive assembly with through-bellows exhaust

Abstract: A marine propulsion device (11) is provided wherein a pair of generally telescoped bellows (31; 38,46) surround the universal joint (18) and provide an exhaust passage (44) therebetween which communicates between the inboard engine (9) and the stern drive unit (2). In the embodiment disclosed herein, the inner bellows (31) rotates with the universal joint while the outer bellows (38,46) is stationary. The bellows are preferably of helical or spiral configuration and the rotating inner bellows forms an exhaust pump. In one embodiment, (FIGS. 1-3), the bellows (31,38) are concentrically disposed, while in another embodiment (FIGS. 4-5) the bellows (31,46) are eccentrically mounted.

Portable compressed air supply with remote control

Abstract: A motor driven compressor is supplied with power from a battery and supplies compressed air at the outlet of an air hose. Compressed air via the hose is supplied to a lifting device, for example a bellows of an invalid seat assembly. In the apparatus the output of the compressor is passed through a non-return valve so that when the compressor is turned off supplied air cannot bleed back through the compressor. A pressure switch breaks the electrical circuit should pressure build up excessively at the output. Additionally, an air dump valve is provided to enable pressure in the output line to be vented to atmosphere. Operation of the compressor is controlled by a hand control.

Disposable manual resuscitator

Abstract: A manual resuscitator is disclosed which includes two disposable bellows having appropriate valves which connect via a chamber to a patient mouthpiece or face mask. The bellows are inserted into a frame comprising a manually-operated telescoping push rod and a return compression spring. When the push rod is moved upward, assisted by the return compression spring, fresh air is drawn into and stored in the inhale bellows and, simultaneously the contents of the patient's lungs are sucked into the exhaust bellows. When the push rod is pushed down, both bellows compress and, as a result, the inhale bellows forces the stored fresh air into the patient's lungs while the exhale bellows forces air plus carbon dioxide, water, smoke, etc., from the patient's lungs into the atmosphere. The inhale bellows is adapted to limit the maximum vacuum suction during exhaling. Also, the exhale bellows is adapted to limit the pressure of the fresh air forced into the patient's lungs.

Collapsible room shelter

Abstract: A collapsible portable shelter or changing room comprising a body of circular bellows like configuration capable of manufacture on current plastic mold equipment with current plastic materials The bellows like walls overlap vertically and integrally down the side around a large aperture in a spring-like manner from tension on the rib folds by manual downward pressure The accordion-like wall, when fully collapsed, substantially fits within an optional carry case fastened to the shelter floor The structure is raised for use from a collapsed into an extended form by manual release of fasteners, causing the bellows wall to spring upward, without assistance, providing a large interior volume sufficient to enclose a person for use as a toilet shelter or changing room

High intensity x-ray source using bellows

Abstract: Several different embodiments of high-intensity rotating-anode X-ray tubes are shown which use a liquid or fluid-cooled rotating-­anode. No ferrofluid-type rotating joints or O-ring gasket-­type seals are required so that the interior of the tube maintains a high vacuum without pumping. A bellows (18) permits mechanical coupling to interior structures of the tube while providing a completely vacuum tight enclosure. All joints may be hard soldered or brazed together so the entire system can be baked at a high temperature during pumpdown.

Plunger piston system

Abstract: A plunger piston system used, for example, to support and guide a pneumatic spring bellows of an air suspension axle of a commercial vehicle or the like, includes a plunger piston that has a cylindrical plunger piston skirt with a bottom foot region for connection with an air spring bearing arm and an upper plunger piston edge that adjoins the plunger piston edge that adjoins the plunger piston skirt. A trough section which extends radially inward from the edge has a trough base with an opening for the passage of a bolt for a force-fit connection with a base of the air spring bellows. The trough section defines a trough to accommodate a convex base of the air spring bellows. A supporting body fits in an inner space of the plunger piston is surrounded by the skirt thereof. A lower foot area of the supporting body rests on the lower foot area of the plunger piston. The plunger piston and the supporting body may be of plastic. The plunger piston is configures so as to be pot-shaped with an essentially cylindrical casing, and the supporting body is configures as a separate part of essentially truncated conical shape with a diameter that becomes smaller form the lower foot area to the trough base of the plunger piston. The upper base plate of the supporting body contacts the underside of the trough base of the plunger piston.

Firefighter's turnout apparel

Abstract: A firefighter's turnout apparel comprises a coat and a pair of pants, wherein the elbow joint and the knee joint sections are formed to include bellows at the bend of the joints for increased protection, flexion range, and comfort. The bellows interconnect material above and below the joint sections to reduce tightness at the outside of the joint areas and material bunching at the inside of the joint areas, permitting freer flexibility and reduced compression of thermal material. Added material in the bellows which extends around the outer joint area, produces a slight bend in the material at these points results in the tunrout apparel having a more natural and comfortable shape through the joint regions, improving the thermal protection due to the reduced compression. In addition to improved thermal protection, the bellows reduce movement of the cuffs of the apparel to provide better protection of wrist and ankle areas.

Bubble-propelled amusement device

Abstract: A bubble-propelled amusement device in which play pieces are dispersed in a water bath contained in an enclosed transparent tank having on its bottom wall an air nozzle and having in the air space above the bath an air intake, the pieces normally tending to sink toward the nozzle. Below the tank is a pump assembly comprising an air chamber coupled to a player-operated bellows, the chamber being provided with an air outlet and an air inlet, each having a check valve therein. The air outlet is coupled to the nozzle so that when the bellows is actuated by the player and compressed, the resultant positive air pressure in the chamber causes the outlet valve to open to feed air into the nozzle which injects into the water bath a stream of air bubbles that act to propel play pieces toward a target, the bubbles then being discharged into the air space. When the bellows is released by the player and permitted to expand, the resultant negative air pressure in the chamber causes the inlet valve to open to draw air from the air space into the chamber. Thus the pump assembly forms with the tank a closed air loop and is isolated from the water therein.

Hydraulically damping rubber bearing engine mount

Abstract: The invention relates to a hydraulically damping rubber bearing engine mount for motor vehicles, having two end walls lying opposite one another in the axial direction and two chambers which are designed as a pressure and an auxiliary chamber and which contain a damping fluid and are connected to one another by a restricted orifice. An annular, rubber-elastic spring element adjoins the pressure chamber and is secured on an end wall. A compensating chamber adjoins the auxiliary chamber and is separated from the latter by a bellows. The damping characteristics of the rubber bearing are alterable by intervention from outside. In order to be able to alter the damping effect of the rubber bearing continuously right up to complete cancellation, a diaphragm is clamped fluid-tightly in the pressure chamber and is loaded on the one side by the damping fluid and on the other side by compressed air which can be fed in from outside. When the diaphragm is loaded by compressed air, an air chamber is formed between the diaphragm and the spring element with the diaphragm lifting off partially or completely from the spring element in response to the amount of compressed air fed from the outside in accordance with a control signal proportional to the desired vibrational characteristics of the vehicle.

Reformer seal plate arrangement

Abstract: A stepped support and seal plate (44) is sealed to firing tube (18) with an axially compressed seal (62). It carries sleeves (24) and is sealed thereto by gasket seals (55). A diagonal movement seal (69) seals plate (44) to the wall of pressure vessel (10). Bellows (76) has a straight portion (77) at the hot end. Insulation (14) is tapered to provide variations in heat transfer from the bellows to provide a uniform strain pattern in the bellows.

An improved fluid spray system having a replaceable cartridge

Abstract: A fluid spraying system having a spray gun (12) capable of alternatively selecting a low pressure aerated cleaning or high pressure non-aerated rinsing mode. The system further has an improved interchangeable and disposable fluid cartridge (10), with a combination metering and check valve (40). The cartridge (10) is sealingly engageable with the gun (12) by use of a bellows fitment (26). The system utilizes the principle of increased or decreased flow volume to alternatively draw fluid from the cartridge (10) or bypass the cartridge (10).

System for raising and lowering the vehicle body of vehicles with pneumatic suspension

Abstract: A system for raising and lowering the vehicle body of vehicles with pneumatic suspension is equipped with a compressed air source, at least one level control valve (15) and air suspension bellows (23) assigned to at least one axle and a control device for the raise, lower, travel and stop positions. The control device essentially comprises an electrical switch (1) for the four positions and a pneumatic control valve (8) which has a slide (26) which can be pilot-controlled by way of two solenoid valves (6, 7).

Axle suspension with two air springs supporting a telescopic strut

Abstract: A steering or non steering axle for buses, trucks or other vehicles including an independent suspension including a pivoting bearing supporting a wheel. A telescopic strut is connected between the pivoting bearing and a wheel housing. Air spring bellows are provided on opposite sides of the strut and are supported between an air spring piston and an upper support. An absorption member is provided on the air spring piston to act when the bellows are fully compressed.

Reciprocating piston compressor with variable capacity machanism

Abstract: A wobble plate type compressor with a variable capacity mechanism is disclosed. Changing the displacement of a cylinders and therefore the capacity of the compressor is accomplished by varying the angle of an inclined surface of the wobble plate. This angle is varied by changing the difference in pressure between the crank chamber and the suction chamber. This pressure difference is controlled by changing the suction chamber pressure while uniformly maintaining the crank chamber pressure. In one embodiment the capacity varying mechanism includes a bellows. In another embodiment the capacity varying mechanism includes an electromagnetic valve and an electronic pressure sensor.

Air assisted medical devices

Abstract: An air assisted device for positioning or moving a limb or a joint uses compressed air as a motive force. In a first embodiment, the air assisted device is a one piece air bag with bellows or accordion-like construction to allow controlled variable degrees of abduction. The bag is placed between a limb to be positioned and a relatively fixed body part or other surface. As compressed air enters the bag, the bag expands and moves the limb away from the body part or other surface. If the bag is maintained in an expanded condition, it immobilizes the limb relative to the body part or other surface. As the bag deflates, the limb returns to its original position. In a second embodiment, the device utilizes a pneumatic piston and cylinder unit to provide the motive force for positioning two relatively movable parts. As compressed air is forced into the cylinder, the piston moves outwardly, moving one of the relatively movable parts away from the other part. Relative movement of the parts moves the limb toward or away from the body part or other surface. The air assisted device may also be used to resist motion of a limb.

Wheel suspension for vehicles with air suspension

Abstract: The invention relates to a wheel suspension for vehicles with air suspension with at least one hollow wheel suspension part designed as welded construction and with a bellows, which reduces its volume during compression, and an air tank connected thereto, which essentially retains its volume during compression. In order to accommodate the additional volume of an air suspension in the vehicle in an especially cost-effective and space-saving manner, it is proposed that the wheel suspension part be closed and lined inside, at least in the area of its welds with a sealing layer, that the interior space of the wheel suspension part be pneumatically connected to the bellows and that the interior space of the wheel suspension part be used as air tank.

Protection of the passage between coupled articulated railway vehicles

Abstract: The subject of the invention is a protection of the passage of rail vehicles coupled to one another and is in the form a double corrugated bellows made of rubberised fabric or the like. The corrugations of the one bellows (1) are open towards the passage, the corrugations of the other bellows (2) are open towards the vehicle sides and an end frame (3) serves for the joint fastening of both bellows of the double corrugated bellows (1, 2) to one of the vehicles coupled to one another, the other end frame (4) serving for attaching together both bellows of the double corrugated bellows (1, 2) to the corresponding end frame of the double corrugated bellows of the other of the two vehicles coupled to one another. Projecting guide means (10) are arranged on the one vertical longitudinal side of the end frame of one of the vehicles to be coupled to one another, which frame is intended for connection to the corresponding end frame of the other of the vehicles to be coupled to one another, but guide means which rebound and correspond in arrangement and design are arranged on the other vertical longitudinal side of this end frame. In a corresponding manner, adjustable locking means are assigned to one of the two longitudinal sides of said end frame and receiving means for the locking means are assigned to the other of the two longitudinal sides of this end frame.

Stabilized free-piston stirling cycle machine

Abstract: A free piston Stirling cycle machine is illustrated by an engine that utilizes an axially movable displacer subjected to working gas pressures. A primary hydraulic circuit hydrostatically couples a displacer drive rod integral with the displacer to a counterbalance illustrated in the form of a scotch yoke. The counterbalance stabilizes and controls the Stirling cycle engine by constraining the displacer's reciprocating axial motion in a repetitive pattern. A throttling valve interposed in the primary hydraulic fluid circuit is used to adjustably resist displacer motion as required by engine operating conditions. A secondary hydraulic circuit is provided together with a bellows assembly between the working gas and power pistons to convert changes in working gas pressure to usable power output in the form of pumped hydraulic fluid.

Pressure regulator valve

Abstract: The interior of the bellows is sealed at atmospheric pressure so the pressure on the outside of the bellows is resisted by the atmospheric pressure within the bellows as well as by the spring. When the pressure on the outside of the bellows (which is evaporator pressure in a refrigeration system) exceeds a predetermined amount, the bellows tends to collapse and the head of the bellows pulls away from the actuating pin and allows the spring acting on the pilot valve to open the pilot valve whereupon the pressure to the right of the head of the piston is reduced, allowing the piston to move to the right against the return spring force and thus open the outlet by moving the end of the piston wall past the slot in the stationary sleeve. When the pressure falls below the desired amount, the bellows expands and moves the head of the bellows against the actuating pin to close the pilot valve. Flow through the bleed hole in the end of the piston to the pilot valve chamber rapidly raises the pressure therein so that the return spring can move the piston to close the outlet. Even with the outlet closed, the small port in the piston sleeve allows enough refrigerant flow to insure adequate flow to the compressor to keep the compressor lubricated. The bleed hole in the piston head is sized to require substantial opening of the pilot valve which, therefore, minimizes false opening of the main valve. Controlled leakage to the groove at the pilot end of the piston blocks flow from the pilot valve chamber to the main outlet and stabilizes valve operation.

Vibro-isolating joint

Abstract: In a vibro-isolating joint including two rigid flanges, a flexible cylindrical member such as bellows interposed between the flanges and a plurality of limiting bolts extended through opposed through holes in the flanges, a cylindrical elastomer body is retained in each of through holes in at least one of the flanges and a hollow sleeve is concentrically integrated with the elastomer body so as to protrude one end of the hollow sleeve from an outer surface of the flange so that lock nuts on the limiting bolts engage the protruded ends of the hollow sleeves resiliently supported in the through holes, respectively to thereby provide a high axial thrust together with a vibration isolating property.

A simplified analysis method for buckling of bellows under internal pressure and its validation tests

Abstract: In this paper a consistent simplified analysis method for the buckling of bellows under internal pressure is developed and its validation is shown by a series of buckling tests. The simplified analysis method is developed for three types of buckling; 1) the column squirm in elastic region, which occurs in case of a relatively large number of convolutions, 2) the in-plane squirm (root bulge), which occurs in case of a small number of convolutions, and 3) the column squirm in elastic-plastic region. For the first two types of buckling, the simplified formulae which have already been seen in the literature are used. For the third, a simplified analysis procedure is newly proposed. The combination of the elastic column buckling theory and the fundamental axisymmetric elastic-plastic analysis of half convolution makes it possible to obtain nonaxisymmetric buckling pressure in the elastic-plastic region. Internal pressure buckling tests using various bellows specimens were conducted. From these test results it is shown that the simplified analysis method predicts the critical pressure of bellows reasonably. The effects of initial bending deformation were also investigated and it is found that they reduce the critical pressure only in the case of column squirm.