Showing papers on "Bellows published in 1987"

Electromagnetic pulse rotary seal

Abstract: An rotary seal for protection against electromagnetic interference and electromagnetic pulses is disclosed. An electrically conductive resilient bellows surrounds a shaft extending through an opening in an enclosure. The bellows is attached at one end to the shaft and biased against the enclosure at the other end. The attachment of the bellows to the shaft includes a static electromagnetic seal.

Variable capacity wobble plate compressor

Abstract: A variable capacity wobble plate compressor in which pressure in a crankcase accomodating a wobble plate is controlled by a pressure-control valve disposed across a communication passage connecting the crankcase and a suction chamber, whereby the delivery quantity or capacity is varied with a change in the inclination angle of the wobble plate depending on the pressure in the crankcase. The pressure-control valve comprises bellows variable in length with a change in the magnituted of suction pressure, a valve body attached to one end of the bellows, a first movable member attached to the other end of the bellows, a first spring urging the valve body in the closing direction, a second movable member which is brought into or out of urging contact with the first movable member in response to at least a change in the discharge pressure, and a second spring interposed between the second movable member and a spring seat. When the discharge pressure is higher than a predetermined value, the second movable member is biased away from the first movable member by the discharge pressure against at least the force of the second spring. When the discharge pressure is lower than the predetermined value, the second movable member is urged against the first movable member by at least the force of the second spring against the discharge pressure to urge the valve body in the closing direction via the first movable member, the first spring and the bellows.

Theory of flexible shells

Abstract: 1. Foundations of Thin-Shell Theory. Shell Geometry. Deformation of the Reference Surface. Hypotheses of the Theory. Shell Deformation. Equilibrium Equations. Elastic Energy. Constitutive Equations. Boundary Conditions. Temperature Effects. Static-Geometric Analogy. Novozhilov's Equations. The Donnell Equations and the Membrane Model of a Shell. 2. Flexible Shell Theory. Basic Flexible-Shell Problems. Reissner Equations. Schwerin-Chernina Equations. Governing Equations and the Model of Flexible Shell. Semi-Momentless Equations. Linear and Nonlinear Approximations. Matrix Form of Operations with Trigonometric Series. Trigonometric-Series Solution. 3. Tubes. Basic Problems of Tube Analysis. Bending of Long Curved Tubes. Noncircular Long Tubes. Lateral and Out-of-Plane Bending. Torsion. Tubes with Given Conditions on the Edges. Tubes of Unrestricted Curvature. Nonlinear Bending of Tubes with Given Conditions on Edges. Collapse of Bent Cylinder Shells and Curved Tubes. Buckling of Tubes and Torus Shells under External Pressure. Bourdon Tubes. Layered Tubes. 4. Open-Section Beams. Open Circular Section. Shallow Profiles. Profiles Allowing a Closed-Form Solution. Bimetallic Strip. 5. Flexible Shells of Revolution. Basic Problems. Bellows under Axial Tension and Normal Pressure. Bellows with Edge Constraints. Lateral Bending and Stability of Bellows. Torus Shell. References.

Dosaging pump with pump bellows on bottles or the like

Abstract: A dosaging pump which can be placed, in particular, on bottles or the like, having a pump bellows and two valves, one of which is associated with the inlet side and the other with a nozzle. The nozzle-side valve-closure member (10) is seated in the cover (10) of a cap which grips over the pump bellows. A cup surrounds the pump bellows, the inlet-side valve-closure member being seated in the bottom of the cup. End portions of the pump bellows are seated on separate collars of the cup and the cap, the cap and cup being moveable relative to each other during pumping, and the valve-closure members communicate with the interior of the bellows.

Disposable self-inflating manual resuscitator bag

Abstract: A manually actuated, self-distending, self-inflating resuscitator bag that is substantially shaped like a pleated, handleless bellows where the pleats act like a spring following compression to rapidly re-inflate the bag to its fully recovered state, and that the flat sides of the bellows enable the operator to easily pump the bag with one hand or a knee as there is no tendency to roll away during the compression cycle.

Four-way valve for refrigerating cycle

Abstract: PURPOSE:To achieve high reliability at low cost with a simple structure with less number of component parts by providing a heat-responsive device disposed so as to exchange heat with the ambient air, and a valve unit to work in conjunction with the heat-responsive device, and comprising the heat-responsive device with a superconducting material with a magnetic substance being disposed to one surface and of the heat-responsive device. CONSTITUTION:A bellows 34 is disposed at one end of a four-way valve 33. One end of a heat-responsive device 37 is fixedly attached to the end of the bellows 34, and the other end 39 of it is opposed to a magnetic substance 38 one end of which is fixedly held by a holder 35. When cooled with the heat-responsive device 37 and the magnetic substance 38 contacting each other, the heat-responsive device 38 comprising a superconducting material overcomes the force of the bellows 34 by the effect of superconductivity at a temperature lower than a certain level, and lift itself off the magnetic substance 38 to move to the left until it is stopped. When the cooling is suspended and the temperature is allowed to rise, the effect of superconductivity is lost, and the heat-responsive device is pushed to the right back to the initial position by means of the force of the bellows. Since the interior of the four-way valve is under the same refrigerant pressure and its function is not affected by the difference between the high and low refrigerant pressures, a highly stable reliability can be obtained.

Insect capturing device

Abstract: A hand-held, manually-operable, portable device is described for capturing insects. The device includes (a) a bellows for creating a vacuum when squeezed, (b) a trap chamber having a nozzle opening to the atmosphere, the trap chamber including an adhesive interior surface, (c) a conduit connected between the bellows and the trap chamber, (d) a screen in the conduit, (e) a valve in the conduit which is movable between open and closed positions, and (f) a trigger to actuate the valve and cause it to open, allowing air to rush through the nozzle and draw an insect into the trap chamber.

Method of forming a flange or bellows in a plastic tub

Abstract: The invention concerns a method of forming a flange or bellows in a plastic tube. The tube is preheated at a precise area and gripping dies are used to compress the heated area. Upon compression, the heated area is forced to bulge out and fold to form the flange or bellows. A mandrel inserted into the tube prior to compression ensures that the tube bulges outwardly. The invention may be used to form a variety of flanges, rims or bellows on plastic tubing. It is particularly useful in forming retaining rims on polyethylene tubing used for gas tank vents. Exposure to gasoline may cause such tubes to swell or bend. With a retaining rim formed in accordance with the present invention such swelling or bending can readily be accommodated.

Adjusting device for an optical element

Abstract: The support (23) of the optical element (17) is connected by means of a bellows (15) to a basic body (10) which has a reference surface (22), and can be adjusted with respect to said basic body. As adjusting elements there are provided between the support (23) and the basic body (10) two annular discs (1, 2) which are clamped by the spring force of the bellows (15) and rest against each other with wedge surface (3, 4) and can be rotated with respect to each other, and which make it possible to adjust the optical element in a simple, precise, and permanent manner. The device is suitable for adjusting a reflecting mirror in laser cavities (laser resonant cavities).

Einrichtung zur mechanisch akustischen ankopplung von druckwellen, insbesondere von fokussierten stosswellen an den koerper von lebewesen

Abstract: Installation for disintegrating, without touching them, concretions within the body of living beings including a shock wave generator (1) and a chamber filled with a liquid, adjacent to the shock wave generator and surrounded by a flexible bellows (2) or similar device. The open rim (2a) of the bellows (2) is provided with a circular open tube (4), of the suction ring type, with an outer and an inner sealing lip (5b) which can be laid on the body (3) of the patient. By applying a negative pressure within the circular tube (4) the desired sealing is obtained without affecting the liquid within the bellows (2).

Bellows for motor vehicle

Abstract: An oil and grease-proof bellows for enclosing joints on axles of motor vehicles is produced from thin thermoplastic elastomers using hollow body production techniques. The bellows has a relatively small diameter collar, a collar of relatively large diameter, and a bellows device disposed between the collars, with an inner envelope and an outer envelope that decreases in diameter towards the smaller diameter collar. At least one bellows rib extends spirally from one collar to the other.

Air bearing type work holder

Abstract: PURPOSE:To easily pressurize a work for a surface plate by jointing a revolution driving shaft and a work guide for press-holding a workpiece on a revolution surface plate through a bellows coupling and supporting the revolution driving shaft and the work guide by an air bearing, in a flow trap device. CONSTITUTION:Before the revolution operation, an air pressure introducing unit 1 and a revolution driving shaft 2 are set into noncontact state by supplying air into an air pressure introducing inlet 10, and the turning moment supplied from the revolution driving shaft 2 is transmitted to a work guide 4 having a plurality of works fixed on the lower part, through a bellows coupling 9, and also a standard guide ring 3 supported by a ball bearing 29 is revolved through a pin 25. When the pressure in the bellows coupling 9 is adjusted through a pressurization control port 12 by a speed controller 38. The work guide 4 air-bearing-supported by the air pocket parts 5-10 presses a work onto a revolving surface plate 28, and polishing is carried out. Therefore, the pressurization for the work onto the surface plate can be varied freely, and the polishing for the work can be carried out efficiently.

Fluid actuated limb

Abstract: A fluid actuated limb comprising an elongate flexible core member having a first plurality of bellows extending parallel to the core member and being radially spaced from the core member around substantially the entire circumference thereof. A second plurality of bellows are radially spaced from the core member and helically wrapped around the length of the core member in a first helical direction, and a third plurality of bellows are radially spaced from the core member and helically wrapped around the length thereof in a second helical direction opposite to the first helical direction. Fluid air pressure selectively applied to the limb results in limb movements including extension and contraction, bending with resistance to torsion, right hand and left hand rotation, and combinations of the aforementioned movements.

Dynamic Performance Testing of Single-Element Unbalanced Gas-Lift Valves

Abstract: Reliable predictions of injection gas passage through gas-lift valves are important for unloading and lifting high-capacity wells. This paper outlines the procedure for conducting static and dynamic tests required to evaluate gas-lift valve performance. Limited test results are presented for the 1- and 1 1/2-in (25.4- and 38.1-mm) unbalanced bellows-charged gas-lift valves with three-ply monel bellows.

Bellows system for deflating weatherstrips

Abstract: A deflatable sealing member forms a weatherstrip to seal a closure opening. The sealing member includes an operative tubular section designed to provide tight interference engagement between the closure and vehicle body when vented to atmosphere and expanded by built-in resilient memory. A bellows pump is connected to the sealing member through a flow control circuit. The bellows pump serves to deflate the sealing member during closing of the closure. The bellows pump is adapted for convenient mounting in a cavity in the closure or vehicle body spaced from the closure hinge area. A flexible cable connects the bellows pump to the closure or vehicle body to provide the necessary actuation for operation of the bellows pump in response to the swinging movement of the closure. As the closure closes and latches, a valve is opened to vent the sealing member to ambient pressure, and the sealing member expands by resilient memory to its full cross section so as to provide a tight seal.

Face-type shaft seal with shroud

Abstract: The face seal of a centrifugal pump has a stationary seal component mounted on the pump casing and a rotary seal component rotatable with the drive shaft extending into the casing and connected to the inner rotary pumping member or impeller. The rotary seal component is biased against the stationary seal component by a resilient welded metal bellows assembly having its end portion opposite the rotary seal component clamped to the drive shaft. To protect the welded metal bellows assembly against abrasive life-shortening contact with particulates in the liquid being pumped, a rigid shroud is provided including a generally cylindrical cavity having an inner wall portion extending close alongside the bellows for at least substantially the full axial extent of the bellows.

Fail-safe bellows assembly

Abstract: A fail-safe bellows assembly eliminates the usual limit bolts and replaces them with a cylindrical guard that encircles the bellows element with its associated coupling flanges and interconnects said flanges so as to permit a limited safe magnitude of elongation and articulation. The guard is connected to one of said flanges, with a coupling or linking to the other flange that permits the desired safe freedom of movement. In one embodiment one of the flanges has the guard clamped to its periphery while the other flange couples to the guard with pins and apertures. Another embodiment uses pins projecting radially inwardly from the guard at one end, replacing the pins in the flange and cooperating apertures in the guard. In addition to the guards, an elastic sleeve is joined to the periphery of each flange with a fluid-tight seal, and a vent passage through one flange interconnects the inter-flange space with the exterior for safe discharge of any fluid escaping from the bellows element.

Collapsible seating system with automatically folding seats

Abstract: Seating for a telescoping row system or the like is mounted to a beam pivotally secured to a base anchored to the platform and riser. The beam is raised arcuately into a use position by a pneumatic bellows and is mechanically locked in the upright position to permit deenergization of the bellows. Reinflation of the bellows disengages the lock and the assembly collapses slowly against the controlled deflation of the bellows. The seat is positionable on the beam initially without fasteners to facilitate installation. In similar fashion, armrests are secured to the beam separate from the seat and adjustable along the beam to permit overall width variations.

Pop-up sprinkler with improved inlet valve

Abstract: A pop up sprinkler utilizes a diaphragm valve oriented in a vertical manner within the sprinkler water inlet. The valve has a circular bellows surrounding a core and is movable between an expanded position embracing the core and a relaxed position displaced from the core. In the displaced position water flow through the sprinkler is allowed, such flow passing about the core in a manner which creates minimal pressure loss in the valve.

Variable pressure regulating valve

Abstract: A pressure regulating valve 10 determines a fixed constant pressure drop across a metering valve 16 at a given altitude by comparing ambient pressure with a vacuum. Evacuated bellows 76 reacts with changes in altitude to bias a poppet 54 via rod 90, adjusting screw 100 and lever 66 towards or away from outlet 54.

Method for producing a bellows with oval cross section and apparatus for carrying out the method

Abstract: After a metallic cylindrical tube is bulged to form a bellows with a circular cross section, this bellows is ovalized to form a bellows with an oval cross section For this reason, an inexpensive round tube (cylindrical tube) can be used as the material for a bellows with an oval cross section and it is unnecessary to use an expensive oval tube Accordingly, a bellows with an oval cross section can be produced at low cost

Pneumatic pumping device

Abstract: A pneumatic pumping device incorporating a movable valve such as a bellows, or a diaphragm, driven by air back pressure in a cylinder so that a liquid is drawn in and discharged by reciprocating movement of the movable valve, and in which surfaces contacting the liquid on the initial and external parts of the pumping device are formed of either a single substance or a compound of a fluororesin such as PTFE, PFA, CTFE in order to feed strong acid liquid or strong alkaline liquid without corrosion on components of the pumping device.

Pressure balanced heat pipe

Abstract: Disclosed is a heat pipe particularly suited for isothermal transfer of heat in high temperature, high pressure operation such as the growing of semiconductor crystals. The heat pipe has a stem communicating with its lower end, a cooler surrounding a portion of the stem, and an expansible bellows connected to the stem. The stem and the expansion chamber formed by the bellows accommodate displaced liquid working fluid to balance pressure within the heat pipe with ambient pressure outside the heat pipe. This avoids the need for complex, multi-layer structures or high strength materials in the heat pipe walls.

Motor vehicle air duct seal

Abstract: A motor vehicle has an air duct on a swinging door that aligns with and is sealingly joined to an air duct on the vehicle body when the door is closed by a collapsible leaf spring biased bellows seal mounted between the door and vehicle body.

Adjustable fill motor assembly

Abstract: A control arrangement is provided which permits precise metering of a bellows pump. The control arrangement permits the predetermined setting of an amount of fluid to be dispensed from a single pump or a plurality of pumps. The control system permits a double bellows pump to cooperate with a drive mechanism in order to precisely meter the fluid to be dispensed from the pump by selecting a predetermined amount of fluid from a range of settings of the control mechanism. When a plurality of double bellows liquid dispensing pump units are provided, a plurality of electric motors are arranged to drive an adjustable stop element and provide a limit on the length of stroke of a driving rod connected to the bellows pump. The motors are controlled by a program logic circuit which monitors the degree of movement of the stop elements and controls the motors in response to a preset or selected fill condition.

Ion beam exposure equipment

Abstract: PURPOSE:To improve the matching of an ion beam axis by varying a distance between an ion source and detecting means. CONSTITUTION:A moving mechanism 12 for moving a direction regulating mechanism 10 in a direction of an arrow to vary a distance from detecting means 7 of an ion source 1 is added. Bellows are altered to bellows 11a which are increased in extending contracting range. Since the image of an image pick-up surface S is enlarged when a distance L from the end of an emitter chip 1a to the means 7 is increased even if the deciding accuracy of the coinciding state of desired IB to the center C by observing the surface S is the same as that in the conventional apparatus, the axis matching accuracy of IB can be improved. Accordingly, an accurate axis matching can be performed.

Device for controlling the angle of inclination of a wagon body for pneumatic spring bogies as a function of track bends

Abstract: In the device for controlling the angle of inclination of a wagon body as a function of bends in the track, it is intended that it will be possible to vary the height of the rolling pole independently of a structure once it has been set up. According to the invention, this is achieved in that the pneumatic spring bellows 2 of a secondary suspension are supported via vertical cylinders 3 on a longitudinal beam 4 of a bogie frame. These vertical cylinders can be actuated by a second control unit 24, a relief cylinder 27 with relief piston 28 and control piston 30 is connected between the pressure source 23 and the vertical cylinders 3 in order to relieve the hydraulic pressure source 23. Independently of the vertical cylinders 3, horizontal cylinders 15 are provided which can be actuated by a first control unit 20 and displace one rocker 9 (Figure 1) transversely with respect to the direction of travel, this rocker 9 being rigidly connected to lower rims 8 of the pneumatic spring bellows 2. By virtue of the movements, which are matched to one another, of the vertical and horizontal cylinders 3 and 15, the height of the rolling pole can be varied to a large extent.

Heat exchanger-filter apparatus for hydrostatic system

Abstract: Apparatus including an expandable bellows having a pair of end plates, one plate being provided with a fluid inlet and the other plate being provided with a fluid outlet A diffuser and filter is located within the bellows across the fluid path between the inlet and outlet Thus, fluid at an elevated temperature entering the bellows must flow first through the diffuser, then through the filter before leaving the space within the bellows In this way, the fluid is filtered before passing to and through the outlet The expansion capability of the bellows provides a heat exchange relation between the fluid and the bellows itself A pressure relief cap can be coupled to an outlet port communicating with the interior of the bellows The inlet is adapted to be coupled to the waste line of a fluid pump of a hydrostatic system and the outlet is adapted to be coupled to the supply line of the fluid pump

Apparatus to be used when welding pipes together.

Abstract: The apparatus comprises a bellows structure (4, 5) for shielding the weld joint area by internal contact with the pipe ends on both sides of the weld joint (3). When the apparatus is inserted and, especially, pulled out after welding, the bellows tend to be damaged by the hot weld joint. It is the object of the invention to solve this problem. The object is achieved by providing both bellows (4, 5) with radial side supports (14, 15) dragging against the inner surface of the pipes and by arranging the bellows to contract within the radial side supports in the absence of an inner overpressure. Between the bellows (4, 5), centering discs (9, 10) are arranged on hoses (6, 7, 8) for leading a protective gas and compressed air. The hoses (6, 7, 8) are connected with the holders of the bellows by means of a through cotter pin provided with a spring (17) for keeping the pin stationary.

Combination tire valve and pressure gauge

Abstract: A tire valve having a pressure gauge disposed therewithin. The pressure gauge mechanism includes a bellows that is mechanically connected through worm gears to a rotary drum tire pressure indicator. A clear window formed through the valve permits viewing of pressure-indicating numerals on the drum.