Abstract: A seal assembly is arranged to contain leakage of hydraulic fluid passing between a wall opening and a penetrant rod portion passing through the opening. The seal assembly includes a sliding-seal member mounted on a portion of the rod for sliding movement toward and away from an abutment surface and a non-sliding flexible-seal member arranged between the body and the sliding-seal member. The body, flexible-seal member, sliding-seal member and rod define a sealed chamber into which such fluid will leak. The chamber communicates with a fluid reservoir through a oneway check valve. The sliding-seal and flexible-seal members are arranged in parallel with one another. In one embodiment, a spring urges the sliding-seal member to move toward an abutment surface provided on the rod. In another embodiment, movement of the sliding-seal member relative to the body is limited by facing abutment steps.

Abstract: A fiber optic feedthrough module which comprises a metal sleeve, a fiber optic element extending through the sleeve relation thereto, and a tandem series of centrally-apertured mating annular sealant bodies of thermoplastic material surrounding the fiber optic element and compressed between it and the sleeve. The module is made by first providing a loose sub-assembly of a plurality of individual but interfitting sealant bodies on the fiber optic element and then inserting this subassembly into a metal sleeve, followed by swaging the whole assembly which eliminates clearances and provides sealed interfaces between the various contacting components.

Abstract: A fluid supply pipe has uniformly spaced diffuser location holes arranged in a line along its length at each of which a saddle is secured to the pipe which includes changeable means for controlling the desired flowrate of fluid from the pipe to a diffuser. The saddle has a threaded connection with the diffuser so that the diffuser can be readily screwed onto or unscrewed from the saddle by hand. The plenum below the diffuser element has a self-draining feature.

Abstract: An equalizer is arranged to continuously sense the control pressures of two valves. In the event of a differential between the control pressures, the equalizer operates to selectively adjust one valve so that the control pressures of both valves will thereafter be substantially equal.

Abstract: A temperature probe has a metal casing, closed at one end and open at its other, in which a temperature sensor is buried in compacted hygroscopic mineral insulation having an exposed end face through which extend wires from the sensor. Such end face is sealed to keep it dry by a metal tube having one end surrounding and brazed to the metal casing, and plugged at its other end by a body of compressed sealant material. Lead wires extend through the sealant body and are electrically joined in a space provided between the exposed end face of mineral insulation and the opposing inner end face of the sealant plug.

Abstract: A ratchet wrench has a member provided with a graspable handle. Two toothed racks are mounted on the member and biased to move inwardly of a slot. A socket has a pawl-like toothed portion extending circumferentially thereabout and engaging both racks. The teeth of the racks are arranged to face in opposite directions. In use, the operator may move the member-handle combination linearly to impart rotary motion to the socket when in engagement with a workpiece.

Abstract: Apparatus for pushing or pulling a cylindrical object includes a frame, a carriage slidably mounted on the frame, and a hydraulic actuator. An intermediately-pivoted lever is mounted on the carriage. The lower end of this lever is connected to the actuator. A roller member is mounted on the upper end of the lever for movement toward and away from a jaw member on the carriage. A stop member may be selectively located on the carriage to limit angular movement of the lever, thereby to allow relative movement between the jaw and the object in one direction but not in the other.

Abstract: A pressure generator for testing and calibrating pressure transducers has a body with an internal chamber. The chamber is filled with a liquid, statically pressurized. A piston is mounted in the chamber on a suspension member. A coil, mounted to move with the piston, is arranged in a magnetic field. The coil is supplied with varying current to cause the piston to oscillate or dither in the chamber. Such oscillation creates a dynamic pressure which is superimposed on the static pressure. Openings are provided in the body to receive the sensing end of one or more pressure transducers.

Abstract: A pressure regulator has an element slidably mounted in a body. A through-bore in the element is arranged to be selectively opened and closed in response to the magnitude of a sensed pressure relative to a predetermined pressure. If such sensed pressure substantially exceeds the predetermined pressure, the element is displaced relative to the body to seat against a high pressure poppet. Such closure of the element through-bore by the high pressure poppet is thereafter maintained, even should the sensed pressure subsequently fall below the predetermined pressure, and requires a manual reset.

Abstract: A vacuum package tester is capable of providing data by which the internal pressure and volume of residual gas of a flexible wall vacuum package exposed to atmospheric pressure may be calculated. A container partially filled with liquid is surrounded by a deformation-absorbing enclosure. A vacuum pump reduces the pressure in the head space above the liquid, thereby causing a submerged package to expand. Pressure gauges record the respective pressures in the head space when the package expands by first and second known volumes. From this data, the internal pressure and volume of residual gas of said package, when exposed to ambient pressure and temperature, may be calculated. In use, the invention also performs an improved method.

Abstract: A double-lift open-shed Jacquard loom comprises hooks controlled by control needles, the leg of each hook having three noses thereon. The loom also has two sets of blades which are movable towards and away from each other by lift means, a stationary set of blades, and at least one hook rake. Bracing means are provided to act on the legs of the ones of said hooks which are disposed on the arresting blades in the open-shed position, to urge said hooks towards the respective lifting blade.

Abstract: A double-lift open-shed Jacquard loom comprises hooks controlled by control needles, the leg of each hook having three hook noses thereon. The loom also has two sets of blades which are movable in opposite directions towards and away from each other by lift means, and a stationary set of blades. The blades of at least one movable set are arranged pivotally about respective imaginary axes which extend in the longitudinal direction of each blades, and a pivoting means is provided for producing simultaneous parallel pivotal movement of the pivotal blades.

Abstract: A needle catheter for scraping or thrombosing vascular walls has a sleeve mounted fast to a needle. The sleeve has a recess in which an inflatable balloon is mounted. The balloon may be selectively inflated and deflated by means of an extra-corporeal syringe. The balloon carries a plurality of abrasive burrs or ribs on the outer surface. After insertion, either subcutaneously or intravascularly, the balloon may be selectively inflated, after which the catheter may be moved longitudinally therealong to scrape or thrombose the walls of the vessel.

Abstract: A valve assembly, mountable on a propane or LPG cylinder, has a gate valve to regulate flow. An auxiliary valve element is movable in response to the liquid level within the tank, and to pressure differentials in the outflow direction. The auxiliary valve interrupts flow through the valve to prevent an overfill condition, or if the valve's outlet communicates with atmospheric pressure, or if the cylinder is knocked over.

Abstract: A single-stage servovalve has a movable member operatively arranged to selectively divide a continuously-discharged fluid jet between two receiver passages. The hydraulic output of the valve is the differential between the conditions in the receivers. In the event of a hard-over failure of the control system of which the servovalve is a part, a jet deflector surface becomes operative to create a substantially balanced hydraulic condition in the receiver passages, thus terminating control.

Abstract: A cellular, volume compressible, strand-like rubber body has a sheathing of lastic material which surrounds the body without being fixedly connected to it. The rubber body may be of foam rubber material.

Abstract: A frequency-sensitive switching circuit includes a selectively-operable switch and a sampling circuit for controlling the switch. First and second signals are supplied to the switch. The first signal is also supplied to the sampling circuit, which senses the frequency of a series of pulses therein and compares such sensed pulse frequency with a set frequency. If the sensed pulse frequency is within the band width of the set frequency, the switch passes the first signal to an output terminal. If the sensed pulse frequency falls outside the band width of the set frequency, the switch passes the second signal to the output terminal.

Abstract: Apparatus for measuring the permeability of a material to passage of a fluid includes a pressure regulator for varying the pressure of a supplied fluid, a pair of jaws which may be clamped onto the material specimen, a solenoid valve arranged between the regulator and the jaws, and a collapsible container arranged to be inflated with such fluid as may pass through the clamped specimen during the test. The permeability of the test specimen is determined in terms of the length of time needed for a known volume of such fluid to pass through the specimen, when fluid at a test pressure is applied to a unit area thereof. The apparatus may further include a pressure switch arranged to sense an inflated condition of the container, and a timer to disable the apparatus until sufficient time has been provided to enable the container to return to its deflated condition. In use, such apparatus performs an improved method of measuring the permeability of the material to passage of such fluid.

Abstract: Apparatus for producing and separating crushable fines includes a crusher, an enclosure, an inclined vibratory chute, a conveyor, and a vent. Solid material is recycled through the crusher. Fines within the enclosure are agitated, become airborne, and are withdrawn and subsequently separated by filtration.

Abstract: Mechanical feedback through an articulated mechanism is provided between the swashplate of a variable displacement hydraulic device and the output stage of an electrohydraulic servovalve for controlling such swashplate.