Abstract: Hydraulic-vibrationally damping rubber mount for motor vehicles with two rigid end surfaces opposite one another in the axial direction and at least two chambers containing damping fluid arranged one after the other, whereby the chambers are connected with one another by means of a choke point. The partition delimiting the two chambers is designed rigidly in the outer region, and held in an axially-movable manner in the inner region. There is a fixed body included in the center. The elastic wall, by means of its flexibility, prevents any cavitation in the rubber mount. At the same time, the fixed body can be used as a tuned vibration-absorption mass for the frequency-dependent reduction of the dynamic spring rigidity.

Abstract: A propeller thruster installation includes a propeller unit rigidly supported in an inner tunnel tube which in its turn is elastically coaxially supported in an outer tunnel tube which is rigidly secured to the hull of a ship. In order to reduce the transmission of noise and vibrations from the propeller unit to the interior of, an ship the annulus between the outer and inner tunnel tubes is filled with elastic gas cushions, or a continuously maintained "bubble curtain" of air.

Abstract: A fluid cushioning apparatus acting as a pivoting medium of two objects having a pivoting feature includes a sleeve, a shaft and a partitioning piece. The shaft has two radially enlarged annulations being closely and rotatably mounted in the sleeve and a dividing wall being axially and radially extended between the two annulations to closely engage with the interior wall of the sleeve. The sleeve is mounted on a first object and the shaft is mounted on a second object which is always to have a pivoting relationship with the first object. The partitioning piece is capable of being closely fitted among the sleeve, the shaft and the two annulations and is secured on the sleeve so that the space formed between the shaft and the sleeve is divided into two compartments.

Abstract: A mount for securing together two relatively displaceable bodies, such as a motor-vehicle engine and a vehicle chassis, with limited relative freedom of movement has a substantially closed liquid-filled chamber formed by a first resiliently deformable wall and a second wall which may be rigid or resiliently deformable. A partition subdivides this chamber into a pair of compartments and has an elastically deformable and relatively stiff portion and an elastically deformable and relatively yieldable portion. One of these portions is formed with a throughgoing orifice. Stops are provided on each side of the relatively yieldable portion to limit the deflection thereof so that low-amplitude vibrations are not transmitted between the bodies, but high-amplitude vibrations are damped when the yieldable portion abuts the stops.

Abstract: Methods and systems are disclosed for (1) forming a mat of lignocellulosic particles electrostatically aligned in a cross-machine direction to the direction of movement of the mat being formed from the particles, and (2) forming a composite panel having a core layer of particles electrostatically aligned in the cross-machine dimension and face layers of particles electrostatically aligned in the machine direction. The multilayered or composite mat of electrostatically aligned particles employs separate orientation cells (30,32) for aligning the particles in the machine and cross-machine directions. For aligning the particles in the cross-machine direction, a uniformly distributed array of particles is passed through a high-voltage electrostatic orienting field having electrical lines of force extending substantially transverse to the direction of movement of the mat being formed. The orienting field may be formed between at least two uniformly spaced, electrically charged plates (60).

Abstract: Elastic rubber engine mounts with hydraulic damping are provided, especially for engine suspensions in motor vehicles. The mounts comprise two separated liquid-filled chambers, defined in part by elastic rubber-like peripheral walls adheringly connected with end walls and with a centrally disposed supporting element for connection to an engine supporting frame. The liquid chambers are separated by an elastic rubber-like partition connected with the supporting element, and flow connection between the two chambers is provided by perforations or choke openings in the partition. The rigid end walls of the two chambers are ridgidly interconnected. Arrangements are provided for minimizing or avoiding hydraulic damping of oscillations of low amplitude and high frequency, while providing hydraulic damping for oscillations of large amplitude and low frequency.

Abstract: The device comprises two armatures one of which is for connection to a support and the other is for connection to a suspended element. A block of elastic material is interposed between, and defines with, the two armatures a closed enclosure. A partition wall provided with at least one calibrated orifice is mounted by the periphery thereof on a first of the armatures and divides the enclosure into two chambers. A liquid fills one of the chambers and at least a part of the other chamber. The partition wall has a part which is movable with respect to the first armature in a direction perpendicular to the mean plane of the partition wall. The first armature has a stop for limiting the extent of the movement of the partition wall.

Abstract: A control valve for controlling the supply of pressurized fluid to a working element, such as a pneumatic spring, comprises a housing having a bore comprising first and second bore sections with a smaller diameter middle bore section. A connection for a source of pressurized fluid communicates with the first bore section; an outlet opening with the second bore section; and a working element, such as a pneumatic spring, is fed from the middle bore section. A valve stem is slidable within the middle bore section in response to displacement of the working element, and has a duct therethrough which can interconnect the first and the second bore sections but which can be closed off by a closure member in the first bore section. The closure member can also isolate the middle bore section from the first bore section.

Abstract: Apparatus for use in driving a pile by means of successive hammer blows at the same time as a vibratory force is to be applied to the pile comprises means for simultaneously transmitting, to a pile to be driven, a force produced by a hammer blow and a vibrating force which is generated by the application of the hammer blow.

Abstract: A pneumatic spring of the piston-and-cylinder type for use with the engine compartment hood or trunk lid of a motorcar and subject to explosive destruction in the event of an engine fire or a collision is provided with frangible, reduced wall portions in the cylinder and/or in the tubular piston rod which yields under excessive stresses and releases the compressed gas from the cylinder under conditions in which it cannot propel pieces of the fractured spring at high velocity.

Abstract: A gas-spring comprises a two-part piston assembly, with an outer piston which slides axially between two stops with respect to the piston rod, a damping passageway, and a valve seat on the piston rod against which the sliding piston seats.