Abstract: A spacer for concentric tubes is constructed as a helical braid; the braid elements have smooth or contoured surfaces, are of a solid configuration, or are made from stranded filaments. The elements or filaments are made from synthetic (polymer) material or metal, or one uses both kinds of materials in the same braid or element.

Abstract: A pipe jacketing and wrapping station includes a pressure roll, urging an extruded ribbon onto axially passing, rotating pipes, arriving in end-to-end abutment. Feelers determine level differences of the pipes adjacent to the pressure roll and cause the end of the trailing pipe to be lowered or lifted as required.

Abstract: The system is used in power-assisted control systems to provide a restoring force to the control stick indicative to the pilot of the deflection of a control surface. The feel system is trimmable in that the neutral position can be altered. In prior systems trimming was accomplished by releasing a brake which permitted movement of a part of the control stick linkage toward an equilibrium position in response to the restoring force. In prior systems the released part acquired sufficient momentum to cause it to overshoot and oscillate about the equilibrium position. If the brake were engaged prematurely, the momentum was imparted to the control stick resulting in a disagreeable "kick" felt by the pilot. To overcome these problems, the brake is repetitively disengaged and engaged at a repetition rate in the range 5-40 Hz. The small amount of momentum built up in each of the successive cycles results in an almost imperceptible vibratory reaction on the control stick rather than a single large "kick".

Abstract: A remote controlled door lock unit includes a motor for driving a worm gear having stop elements at its ends for abutment with a travelling nut; and having tangentially facing stop and counterstop surfaces. The axially moved nut drives the lock actuator. The motor is turned on via a time relay just to drive the nut from one to the opposite stop position.

Abstract: One or more electromagnetic stirring elements are mounted on arms and/or holders, extending from a carriage which runs on a stationary bed and in a direction transversely to the direction of casting. The stirring elements are either directly positioned in the direction of carriage movement or orthogonally thereto. Multiphase elements can be positioned from three different directions to circumscribe the casting.

Abstract: A print head for matrix printing has twelve needles whose front ends are arranged in three columns and seven rows, whereby the middle one holds only two needle ends in the second and sixth row, while the other row positions each of the two outer columns hold one needle tip. This arrangement permits a significant print speed increase for a moderate weight increase, and reduces the number of weak spots in the needle guiding mouth piece.

Abstract: A burner body defines a combustion zone and a secondary dilution zone. A first inlet opening leads to the combustion zone to admit fuel and air while a second inlet opening leads to the secondary dilution zone. The burner body contains a tertiary dilution zone connected to a third inlet opening. The secondary dilution zone is positioned downstream from the combustion zone and the tertiary dilution zone is positioned downstream from the secondary dilution zone.The flow areas of the first inlet opening and the second inlet opening is arranged to have a constant ratio. An air passage supplies air to the first, second and third inlet openings and a flow controller is positioned to control the air flow through the third inlet opening. When the flow controller is closed, air flows from the passage through the first and second inlet openings, while, when the flow controller is open, air flows from the passage through the first, second and third inlet openings.

Abstract: Devices to remove polluting components from waste liquids are usually designed to operate satisfactorily as long as the input flow rate remains less than some maximum allowed value. Greater flow rates will cause inadequate purification and resulting downstream pollution, as well as possible damage to the device. An emergency overflow weir may be provided to divert excessive input flow into a buffer vessel or alternative discharge channel. The weir will divert a part of the excess flow, but the remainder will pass through the device; the relative portions depend on the relative flow resistance of the weir and of the device, respectively. The present invention enhances the flow resistance of the device when the flow rate through it is greater than the maximum allowed value, so that a greater fraction of the excess flow will be diverted by the emergency overflow weir.

Abstract: A device for holding bait fish to permit cutting a strip from the side of the fish. The device comprises a holding block having a depression to hold a fish with a side of the fish protruding. A clamping plate has a further depression formed in it. These depressions are correspondingly shaped to hold opposed sides of a bait fish. A pivotal joint between the holding block and the clamping plate permits variable spacing between the holding block and the clamping plate. Spikes in the depressions engage and assist in locating a fish held between the holding block and the clamping plate. One slot is formed longitudinally in each of the holding block and the clamping plate and there is a guide block for a knife blade positionable within each slot. Control of the projection of each guide block from each channel to control the thickness of the strip cut is permitted.

Abstract: An antenna mast is constructed from telescoped tubes which are extended for deployment by hydraulic or pneumatic pressure, the tubes when extended, are latched to each other internally, permitting depressurization. A set of unlatch cones becomes sequentially effective to unlatch the latches, beginning from the top to stepwise telescope the tubes into each other. Spring biased latches are mounted on an insert in the bottom of tubes; the unlatch cones, except the highest ones, extend from the bottom of the inserts.

Abstract: A method and a device for bringing about particle growth in a flowing liquid by making use of the velocity differences caused by wall friction in a flow duct through which the liquid is caused to flow, which duct is directed at an angle in respect of the vertical direction, and is, in particular, horizontally directed.

Abstract: A support construction includes two different-size sheets, the smaller one being sealed along all of its margins to the larger one, and the assembly is folded over, the smaller sheet being on the inside while overlapping margins of the larger sheet are sealed, in order to form a flat air compartment bonded by a liquid compartment having an upper and a lower portion. Additional seal points between the sheets establish obstructions for the liquid. An alternative form uses a flattened and folded lower sleeve. Valves permit filling of the compartments.

Abstract: The stator of a linear motor is assembled by separately assembling the windings as a uniform configuration, using a dummy to place cables into requisite positions and tieing the resulting coil ends together by end elements. The dummy is of an endless belt variety and is used to assemble the stator winding configuration in endless type fashion. The resulting assembly is placed into the stator core or cores which have been placed along the contemplated track part along which the motor is to move a vehicle or the like, carrying the armature of the motor.

Abstract: In the improved pawls of the present invention, the tip of the first finger is provided with an edge which is inclined upwardly toward the second finger. The coins in the first chute interact with this sloping edge as the door is drawn open, instead of with the side of the finger when the coins are inserted, to produce the slight pivotal movement of the pawl which positions the second finger in the second coin chute. The improved pawl requires both a first particular combination of coins in the first chute and a second particular combination of coins in the second chute to unlock the door.

Abstract: A manual control system for aircraft with feedback is improved in that the error signal amplifier gain varies also in response to the error signal. The gain is normally (zero error signal) quite low, well below the critical gain for high speed operation of the craft. The gain is increased with the error signal taking into account that the craft's reaction is lower at low speeds, and that error signals are usually lower at high speeds, particularly because stick command outputs are lower and craft's reaction is faster.

Abstract: Cellulose sulfate esters are cross-linked with tetravalent metal ions at a threshold pH of about 3.0 or higher. The cross-linked products have a higher aqueous viscosity and are more highly pseudoplastic than the precursor cellulose sulfate and may also exhibit a relatively high yield point. The products may be employed in forming thickened aqueous compositions and cohesive gel-like compositions.The presence of other metallic ions, in addition to the tetravalent metal ions, is beneficial and enhances the viscosity increase produced by cross-linking of the cellulose sulfate with the tetravalent metal ions.

Abstract: A construction which permits existing swimming pools to be provided with a spa at low cost includes a removable partition which is mounted in the pool to define the space to be used as a spa. A special gasket forms a seal between the partition and the pool. Valves are installed in the existing pool suction pipe and pool return pipe to permit the flow to be diverted to the spa. No excavation is required to install the spa. An adjustable template is used to determine the proper size and shape of the removable partition. The pipe through which water enters the spa is provided at its end with a jet nozzle which includes a venturi for introducting air into the incoming stream of water.

Abstract: Equipment for ultrasonic testing structural materials includes transducers and test electronics normally operated in sequential test cycles each cycle including the generation of a test pulse to be sent into the test object and subsequently, upon interaction with the test object, return signals (echos) are received and processed, e.g. as to transit time, amplitude, contour, etc. Self-checking is carried out in three phases. One phase uses simulated receiver signals for operatively disconnected transducers, to be processed by the electronics as if they were echos; a second phase uses simulated transducer inputs and analogous processing and a third phase uses a reference body as test body simulation for conduction of "tests". The results of signal processing are compared with reference signals and correlation of deviations and absence of deviations is used to isolate malfunctions.

Abstract: A strip is folded longitudinally around a tube to, thereby, establish an assembly of an inner and a concentric outer tube; individual slotted foam strips are placed in transverse orientation onto the strip just prior to folding; they will become spacers with V-shaped notches. Just prior to closing the outer split tube, foam is introduced into the ring space between the tubes which will spread freely through the notches.

Abstract: A polysaccharide or polyvinyl alcohol containing a mixture of nitrite ester groups with sulfate or nitrate ester groups with the mixture of ester groups being substantially uniformly distributed among the polymer units of the polysaccharide or polyvinyl alcohol.A nitrite ester of a polysaccharide alcohol having a degree of substitution of less than about 2.0. A nitrite ester of polyvinyl alcohol having a degree of substitution of 1.0 or less.