Abstract: A fluid-filled elastic mount including first and second support members and an elastic body interposed between these members for elastic connection thereof. The elastic mount has a pressure-receiving chamber partially defined by the elastic body, first and second equilibrium chambers defined by first and second flexible diaphragms and communicating with the pressure-receiving chamber through first and second orifice passages, respectively. The second orifice passage has a higher ratio of the cross sectional area to the length than the first orifice passage. The present elastic mount further includes a pressure control device for selectively applying a vacuum pressure to a vacuum-receiving chamber which lies behind the second equilibrium chamber via the second diaphragm, to thereby restrict elastic deformation of the second diaphragm.

Abstract: A bracket structure resistant to fatigue and a process of making same are shown. The structure can be useful for conveyances such as parts of automobiles; it comprises: a first and a second member joined together at a junction and extending out therefrom to form a gap between the resulting diverging surfaces; and a stressed gusset spanning the gap, the gusset having a first contact surface abutting said first member and second contact surface abutting said second member, the first contact surface being affixed to said first member, the second contact surface being in vibration-dampening frictional contact with said second member due to the stress on said gusset. Steel members and a steel gusset are preferred, together with a plug-welded connection of the first contact surface to the first member.

Abstract: An isolation platform for use with an entertainment system component having a plinth for supporting the entertainment system component and a granular vibration absorption medium for dissipating mechanical vibrations. The granular vibration absorption medium is in communication with the plinth for isolating the entertainment system component from mechanical vibrations. A base structure is provided for containing the granular vibration absorption medium. The isolation platform functions to isolate the entertainment system component from mechanical vibrations to prevent degradation of performance of the entertainment system component. The base structure includes a plurality of shock-absorbing support feet for absorbing mechanical vibrations. A gap is located between the plinth and the base structure for minimizing the transfer of mechanical vibrations between the plinth and the base structure. The gap is filled with the granular vibration absorption medium.

Abstract: A double pumper mount useful as a front mount for an aircraft engine. A pair of fluid chambers are selectively interconnectable by one of a plurality of inertia tracks by use of an adjustable cylindrical member which has the tracks formed as generally helical grooves extending about the periphery of the cylindrical member. These inertia tracks have different flow characteristics so as to produce differing notch frequencies so as to attenuate different vibrational frequencies. A second embodiment has a single inertia track whose length can be altered by rotating the cylindrical member to change the point at which the ingress/egress port of the fluid chamber engages the circumferential portion of the inertia track.

Abstract: A fluid-filled elastic mount including an elastic body which is interposed between radially spaced-apart inner and outer sleeves and which at least partially defines a first pressure-receiving chamber containing a non-compressible fluid. A partition is provided for partially defining at least one second pressure-receiving chamber filled with the fluid. The partition includes a displaceable flexible layer which permits a pressure change in the first pressure-receiving chamber to be transmitted to the second pressure-receiving chamber or chambers. A variable-volume equilibrium chamber filled with the fluid is partially defined by a flexible diaphragm, and communicates with the first pressure-receiving chamber through a first orifice passage, and with each second pressure-receiving chamber through a second orifice passage whose ratio of a transverse cross sectional area to a length is larger than that of the first orifice passage.

Abstract: A hydraulic damping device has a pair of supporting members to be secured to a vibrating body and a frame, respectively, and a rubber block disposed between the supporting members. A concave surface of the rubber block and a rubber sheet which is joined to the rubber block together define a liquid chamber filled with a damping liquid. A partition defines the liquid chamber into a main liquid chamber and an auxiliary liquid chamber. The partition has an opening which is closed with an elastic rubber wall. The partition is also provided with a throttle passageway which communicates with both the main liquid chamber and the auxiliary liquid chamber. The elastic rubber wall has a flat surface facing the main liquid chamber, and a concavely curved surface facing the auxiliary liquid chamber so as to have an arch-shaped cross-section.

Abstract: A mounting device with two attachment portions, one connected to a transmission portion of an engine/transmission assembly and another connected to a frame member of a vehicle in which the attachment portions rotate relative to one another about an axis normal to a plane of engine/transmission angulation during assembly thereof to the vehicle and during subsequent operation of the vehicle. A stationary cylindrically tubular sleeve encircles a rubber isolator which can rotate in the sleeve. One of the attachment portions of the mounting device is connected to the rubber isolator and rotates with it whereby the angular position of the engine/transmission is varied with respect to the vehicle.

Abstract: A hydraulic antivibratory sleeve comprises, on the the one hand, two rigid tubular frames (1, 2) with an axis X, one surrounding the other, joined together by an elastomer body (3) shaped so as to form therewith at least two sealed pockets (A, B) diametrically opposite in a direction Y perpendicular to axis X and communicating together through an narrow channel (4). The assembly formed by these pockets and the channel is filled with liquid. The sleeve includes, on the other hand, at one of its axial ends, an annular work-chamber (C) defined partially by a resilient wall (7) resisting axial compression. This sleeve further comprises at its other axial end an annular compensation chamber (D) defined partially by a flexible membrane (12), a narrow channel (13) connecting the two annular chambers directly together and the assembly formed by the channel and the two chambers being filled with liquid.

Abstract: A vibration isolating device has a liquid chamber which is hollow space defined mainly by a vibration absorbing main body made of an elastic material containing a natural rubber having a low loss factor and a flexible membrane made of an elastic material containing a heat- and ozone-resistant rubber and in which a liquid is charged, the liquid chamber being divided into liquid sub-chambers which communicate through a passage. The vibration absorbing main body in which an inner cylinder is inserted and the flexible membrane are attached by vulcanizing to an intermediate cylindrical case. A metallic cylinder in which the aforementioned passage is formed and the intermediate cylindrical ase are press fitted in an outer cylinder. The passage exctends from the outer circumference of the intermediate cylindrical case to the outer cylinder.

Abstract: A resilient pressurized fluid articulation is disclosed which has variable stiffness, i.e. whose stiffness may be modified at will under the influence of an external agent. The articulation includes a resilient material block (5, 5a; 15, 15a) mounted between rigid bearing surfaces of a structure (7, 7a, 7b, 7c) which contains it. At least two of these surfaces of the block are movable with respect to each other in at least one direction, under the action of external forces acting in this direction. The resilient material block (5, 5a; 15, 15a) defines in the structure at least one chamber (3) adapted to be fed with pressurized fluid through a duct (2) opening to the outside. The block (3) also comprises at least one part (18, 18a) which is deformable under the effect of the pressure, deformation of the part then modifying the stiffness of the block in the direction.

Abstract: A fluid-filled elastic mount including a first and a second support member which are spaced apart from each other in a load-receiving direction, an elastic body for elastically connecting these support members, and a partition structure supported by the second structure. The elastic mount has a pressure-receiving chamber partially defined by the elastic body, and a first and a second equilibrium chamber partically defined by respective first and second flexible diaphragms. The elastic mount further has a member which cooperates with the first diaphragm to define a first air chamber separated from the first equilibrium chamber by the diaphragm, and a pressure control device for applying a selected one of two different pressures to the first diaphragm or the above-described member, so as to selectively permit and inhibit elastic deformation of the first flexible diaphragm.

Abstract: An isolator includes flexural elements for resisting transmission of shock and vibration forces between structures, and also includes conductor elements for conducting energy such as heat and/or electricity from at least one of the structures. Each element spans the distance between a pair of isolator supports connected to the structures.

Abstract: An insulating bushing through which an engine is supported on a vehicle body. The insulating bushing is comprised of a support elastomeric member tightly interposed between inner and outer cylinders. One of the inner and outer cylinders is connected to one of the engine and the vehicle body while the other is connected to the other of the engine and the vehicle body. The support elastomeric member is formed with main and auxiliary fluid chambers which are separate from each other in the peripheral direction. The main and auxiliary fluid chambers are in communication with each other through an orifice passage formed along the inner periphery of the outer cylinder. Additionally, a flange plate is fixedly disposed within main fluid chamber to divide the fluid chamber into two chambers located side by side in the diametrical direction.

Abstract: An apparatus having a high center of gravity incorporating an energy absorbing device is disclosed. The energy absorbing device includes a rapidly extending shock absorbing device to absorb and thereby dampen the forward motion of an apparatus having a high center of gravity such as a vending machine subjected to a tipping force in the lateral direction. A method of fabrication for example a vending machine having an energy absorbing device is also described. In the vending machine example, the energy absorbing device prevents an individual from using a rocking motion to develop sufficient angular momentum enabling the individual to tip the vending machine into a forward position.

Abstract: An isolator with improved uniform spring characteristic response resists transmission of shock and vibration forces between structures, and includes a plurality of arched, individual, flexural support elements arranged circumferentially about an upright axis and spanning the distance between a base connectable to one of the structures, and an elevated support connectable to another of the structures.

Abstract: A bearing which includes an inner part and an outer part arranged in spaced apart relation. In between the inner part and the outer part is a rubber, or resilient, part which can be loaded axially for tension and/or compression and which permits cardanic loads with very little restoring torque. The rubber part, together with the inner part and the outer part, form a cavity which is filled with fluid which transfers corresponding load capacities in the main load direction.

Abstract: A fluid-filled elastic mount including a first support structure and a second support structure which are spaced from each other in a load-receiving direction, an elastic body for elastically connecting these structures, and a partition structure supported by the second support structure. The elastic mount has a pressure-receiving chamber partially defined by the elastic body, first and second variable-volume equilibrium chambers partially defined by respective flexible diaphragms, and first and second air chambers for permitting the respective diaphragms to elastically deform. The pressure-receiving chamber communicates with the first and second equilibrium chambers, through respective orifice passages which are tuned to different frequency ranges of vibrations. The present elastic mount includes a pressure control device connected to the second air chamber for changing a pressure in the second air chamber.

Abstract: A mounting device such as an engine mount for automobiles, which receives various types of vibrations over a wide frequency range, is required to exhibit a low dynamic spring constant with respect to the input vibrations in a middle- to high-frequency range, while assuring high damping characteristics with respect to the input vibrations in a low frequency range.

Abstract: A wiper system for motor vehicles is described in which a pivot-shaft assembly is fixed to the one end of a pipe-like carrier held by way of its other end on a stud of a motor carrier member stable in form. Wiper systems of this kind can also be produced at low costs for motor vehicles in which the assembly conditions are difficult.

Abstract: The present invention relates to an active mount system in which a vibration sensor such as a force gauge or an accelerometer senses vibrational forces transmitted through a resilient mount by a load such as a machine. The invention further includes a digital narrow-band least mean square filter that receives a sinusoid synchronous with the rotating machinery and an error signal from the load cell and generates a corrective signal to be amplified and transmitted to the electromagnet which supplies an attenuating force to the resilient mount in response to the signal. As an alternative, a wide frequency range control can be realized by the use of a wide frequency range, high gain amplifier and multi-filter phase compensation circuitry to generate the corrective force signal which is amplified and transmitted to the electromagnet.

Abstract: In order to improve image resolution and magnetic field uniformity in a magnetic resonance imaging device, the vibrations and loads produced by the cryocooler are isolated from the superconducting magnet and cryostat. The vibrations and loads are isolated through the use of flexible, laminated copper connectors and rubber mounts.

Abstract: A hydraulically damped rubber bearing includes a journal bearing, a bearing member and an annular spring element of elastic material forming a bearing spring having a perpendicular axis of deformation. The bearing spring is disposed between the journal bearing and the bearing member. A fluid-filled working chamber is surrounded by the journal bearing, bearing member and bearing spring. A compensation chamber is connected in fluid communication with the working chamber via a damping port. At least one relief spring is formed of a substantially non-creeping and/or non-settling material. The relief spring is connected in parallel with the bearing spring to support the journal bearing on the bearing member when the rubber bearing is load.

Abstract: A fluid-filled elastic mount having a first and a second support structure, an elastic body interposed between the two support structures, a partition member cooperating with the elastic body to define a pressure-receiving chamber, a flexible diagraphm cooperating with the partition member to define an equilibrium chamber, and a resonance member fixedly disposed in the pressure-receiving chamber and including a flexible film which at least partially defines an air chamber. The elastic mount includes a pressure control device for changing the pressure in the air chamber, thus changing the vibration damping or isolating characteristics for the elastic mount.

Abstract: A hydraulically damped engine mount includes two separate working chambers 1 which are filled with liquid and are at least in a partial area bounded by a resilient wall 2 and joined by a damping opening 4. At least one of the working chamber 1 is additionally joined to a compensating chamber 3 by means of a compensating opening 5. By means of a flexible and substantially nonelastic wall 4a, the compensating chamber 3 is suited for the pressureless reception of additional liquid. The compensating opening 5 exhibits a flow resistance which is substantially greater than that of the damping opening 4.

Abstract: A hydraulic mount assembly includes an elastomeric hollow body connected to a pair of opposed mounting members. A resilient diaphragm closes the hollow body and forms therewith a closed cavity that is filled with a damping liquid. A partition plate is provided in the hollow body to divide the cavity into a primary chamber and a secondary chamber. The secondary chamber is enclosed by the diaphragm. An orifice track is provided in the partition plate. The orifice track provides communication between the primary and secondary chambers so as to effect damping. Three decouplers are provided in the partition plate centered relative to distinctive dome areas in the primary chamber; two recessed domes and a center projecting dome. The decouplers respond independently to localized dynamic pressure variations.

Abstract: A vibration damper for damping roll vibration of a power unit mounted on a vehicle body. The vibration damper is composed of a disc plate fixedly connected to the power unit in a manner that the axis of the disc plate is generally parallel with a roll axis of the power unit. The disc plate is sealingly disposed in a chamber formed in a generally circular casing which is coaxial with the disc plate. A viscous fluid is filled in a space defined between the disc plate and inner surface of the casing. The casing is formed of a plastic which has a higher linear expansion coefficient than a metal forming the disc plate, thereby allowing the space filled with the viscous fluid to expand along with thermal expansion of the viscous fluid.

Abstract: A hydraulically damped engine mount comprises liquid-filled working and equalization chambers 1, 2 which are separated by a resilient partition wall 3 and connected by a damping opening 4. The axially opposing working chamber 1 and the equalization chamber 2 are bounded by essentially non-deformable pistons, the latter being connected to a centrally disposed, annular fitting by means of an liquid-impermeable and elastically deformable annular body. These pistons are rigidly joined to one another by means of a connecting rod 7. The piston 9 bounding the equalization chamber 2 has a piston surface which is at least as large as the piston surface of the partition wall 3. The annular body corresponding to this piston is a first rolling membrane 6 which is curved in the axial direction toward the outside and the partition wall 3 is a second rolling membrane which is curved in the axial direction to extend into the working chamber 1.

Abstract: The invention relates to a balanced supporting arm, comprising a substantially elongate structural member which is mounted on a supporting assembly for tilting movement and which is provided with at least one bellows mounted under at least one end of the supporting arm. According to the invention, the bellows has an inoperative condition wherein it is at least substantially empty and an operative condition wherein it is filled with a gas under a predetermined working pressure. The balanced supporting arm comprises means for detecting the tilting speed of the supporting arm and, further, means, connected with the means for detecting the tilting speed, for bringing the bellows from the inoperative condition into the operative condition when the means for detecting the tilting speed detect that the tilting speed exceeds a predetermined value.

Abstract: A vibration isolating device is disclosed, which comprises two vibration-damping liquid chambers, and a partition member interposed between the two liquid chambers and provided with a restricted passage therein. In this device, the partition member comprises a pair of lapped plate materials, at least one of which is provided with a depression for defining the restricted passage in the lapping of the plate materials.

Abstract: A hydraulically damped rubber cartridge spring incorporates two chamber pairs (4, 6; 5, 7) isolated from one another by a wall (8 ). The chambers are located at a distance from one another in the direction of the introduced vibrations. The chambers of each chamber pair are connected by damping orifices (9, 10) of a channel-like configuration. The damping orifices (9, 10) are so dimensioned and coordinated with the bulge elasticity of the corresponding walls (11) of the bilaternally adjoining chambers, that the contained liquid mass enters into a resonant motion if the vibrations introduced by the spring's operation differ from one another in frequency. The dividing wall (8) contacts the external sleeve (1) loosely when vibrations are not introduced, and at the same time is resiliently deformed toward the internal tube (2) by the external sleeve (1).

Abstract: An engine mount includes a main working chamber and an expansion chamber. Orifice passages in which electrodes are disposed, fluidly connect the main and expansion chambers. An auxiliary chamber which is hermetically separated from the main working chamber by a flexible partition is in part defined by a diaphragm the external surface of which is exposed to atmospheric pressure. The auxiliary chamber contains an ERF which develops a higher viscosity than the ERF which fills the main and expansion chambers. When a voltage is impressed on electrodes in the auxiliary chamber the viscosity of the ERF increases and the flexure of the flexible elastomeric partition is prevented.

Abstract: A fluid-filled elastic mount for flexible connection of two members, including a first and a second support member, an elastic body interposed between the first and second support members, a closure member for partially defining a fluid chamber filled with a non-compressible fluid, a partition assembly for dividing the fluid chamber into a pressure-receiving chamber and an equilibrium chamber, and device for defining a restricted passage for restricted fluid communication between the pressure-receiving and equilibrium chambers. One of the first and second support members has a first abutting surface which extends substantially perpendicularly to the load-receiving direction, and a second abutting surface substantially perpendicular to the first abutting surface. The elastic mount is provided with a stopper member secured to the other of the first and second support members.

Abstract: A fluid-filled cylindrical elastic mount including an inner and an outer sleeve, an elastic body interposed between the two sleeves, at least one fluid chamber filled with a non-compressible fluid, and a flow-restricting member freely movably accommodated in the fluid chamber. A flow-restricting portion is provided around the flow-restricting member. The flow-restricting member has a pair of opposite end faces facing the axially opposite walls partially defining the fluid chamber. The flow-restricting portion includes a pair of axially spaced-apart sections defined by the axially opposite walls and the opposite end faces of the flow-restricting member, and a pair of radially spaced-apart sections defined by the flow-restricting member and the radially opposite walls of the fluid chamber.

Abstract: A structural element or member is disclosed that resists or damps vibration rom loads applied along a given axis without significantly sacrificing stiffness, through the use of stress coupling within an anisotropic material. Essentially, the structural member comprises alternating layers or laminates of stiff and viscoelastic or damping material bonded together to form a laminated structrue. The laminated structural member is oriented to receive the applied load in a direction that is parallel to the laminates. At least one of the stiff laminates shows anisotropic behavior when acted upon by the axial load, causing shear strain and concomitant transverse displacement therewithin, thereby loading the viscoelastic laminate in shear.

Abstract: In a drum type washing and dehydrating machine which is elastically supported, the drum type washing and dehydrating machine according to the present invention comprises a vibration fixing device having a clamping part for fixing or releasing a base on which is installed a treatment drum system, and means for releasing the vibration fixing device from its preceding fixed state, in the washing and dehydrating processes, after the vibrations of the machine passed the vibration resonance point of the system.

Abstract: A fluid-filled mount includes a body made of a resilient material and having a structural member supporting region on one end and a vibrating member supporting region on the opposite end. The body has a main fluid chamber defined therein between the structural member and vibrating member supporting regions, at least one auxiliary fluid chamber defined therein laterally of the main fluid chamber, and an orifice communicating between the main and auxiliary fluid chambers. A fluid is filled in the main fluid chamber, the auxiliary fluid chamber, and the orifice.

Abstract: A structure of a vibration-proof rubber bushing with a high loss factor and high durability is disclosed which comprises a) a metallic outer envelope; b) a viscous fluid preferably of a liquid such as silicone oil filled in the outer envelope; c) a first elastic member; and d) a metallic inner envelope fitted into an inner portion of the outer envelope via the first elastic member.

Abstract: Elastic bushing with hydraulic damping of radial elasticity by circulation of liquid between two chambers opposite one another connected by a very long annular passage located in the round exterior fastening armature. A rigidity decoupling, over a short stroke, is provided by the deformation of a thin wall in each chamber. One side of the thin wall has air thereagainst and the other side has a damping liquid thereagainst. On the air side of the thin wall, movement is limited by an internal fastening ring, and on the liquid damping side by contact with a comb integrated in said internal fastening ring. Application of the bushing is in the fields of mountings for an automobile engine and similar uses.

Abstract: An elastically yieldable connection of the type comprising a block composed of elastomer material to which are connected two armatures which are relatively movable. The connection comprises at least one deformable sealed chamber filled with a liquid and arranged between two portions of each of the two armatures so as to increase the elastic stiffness of the connection in a direction (T) of relative displacement of the armatures substantially perpendicular to a plane parallel to which extend the two armature portions, and at least in the direction corresponding to an approach between these portions. Application in particular in the mounting of a set of wheels of a motor vehicle.

Abstract: A vibration isolator is operatively associated with a suspension having a spring (21) and a fluid damper (22) arranged in parallel with one another between two masses (23, 24) which are arranged to move relatively toward and away from one another. A restricted orifice (33) communicates the opposed damper chambers (30, 31). The vibration isolator includes a fluid pump (46) and an actuator (48) for operating the pump. The pump has a first chamber (51) communicating with the damper first chamber (30), and has a second chamber (52) communicating with the damper second chamber (31). The pump is selectively operated so as to create a pressure differential across the orifice to oppose and substantially cancel the dynamic force transmitted through the spring and damper and attributable to high-frequency relative vibration between the masses, while permitting the damper to damp low-frequency relative velocity between the masses.

Abstract: A damping coefficient control device, for use in a vibration damper of the type which is disposed between a vibration source and a vibration receiving section to be isolated from the vibration of the vibration source and which has a plurality of small liquid chambers charged with an electrorheologic fluid and communicated through an orifice, includes electrodes disposed in the orifice to receive a voltage which is suitably controlled so as to cause a change in the viscosity of the electrorheologic fluid, thereby controlling the damping coefficient provided by the fluid. The damping coefficient control device has sensors for sensing the velocities of the vibration source and the vibration receiving section.

Abstract: A fluid-filled cylindrical elastic connector having an inner sleeve, an outer sleeve, and an elastic body between the two sleeves. The elastic connector has a main fluid chamber and a first and a second auxiliary fluid chamber, which are formed between the inner and outer sleeves such that the first and second auxiliary fluid chambers are disposed diametrically opposite to the main fluid chamber with respect to the inner sleeve, and such that the first and second auxiliary fluid chambers are spaced from each other in an axial direction of the inner sleeve. The main, first auxiliary, and second auxiliary fluid chambers are filled with a non-compressible fluid. Upon application of a vibrational load, relative pressure changes occur between the main fluid chamber and the first and second auxiliary fluid chambers.

Abstract: An energy dissipating device, particularly for use in structures impervious to seismic occurrences, includes a metal element having the shape of at least a symmetrical double portal, which is asymmetrically deformable in the elastic field or beyond the elastic limit. The center pier of this portal is fastened to one portion of the structure, whereas the two side piers are fastened to another portion of the structure so as to compel this metal element, upon a relative movement of the two portions of the structure, to be deformed in the elasto-plastic field, thereby dissipating the deformation work by hysteresis of the material principally in the form of heat.

Abstract: A refrigerator-operated apparatus having a housing adapted to accept components to be cooled. The housing is connected to a refrigerator housing via a connecting pipe, and the refrigerator includes a refrigerator generator extending through the housing and the connecting pipe, and encompassing at least one refrigerator stage that carries the components to be cooled. The apparatus further includes a damping mechanism for inhibiting vibrations generated by the refrigerator from being transmitted to the housing. The damping mechanism includes a separation space dividing the refrigerator housing into first and second connecting sections, and an elastic connecting ring connecting the first section to the second section. In one embodiment, the connecting ring extends across the separation space and is surrounded by a cover tube. In a second embodiment, the connecting ring is secured directly to one of the connecting sections, and is secured to the other connecting section via an adaptor pipe.

Abstract: A power unit mount through which a power unit is mounted on a vehicle body. The power unit mount is comprised of an elastic support member securely disposed between inner and outer cylindrical members which are respectively connected to the power unit and the vehicle body. The elastic support member is formed with a hollow a part of which serves as a main fluid chamber. A diaphragm member is secured to the inner peripheral surface of the outer cylindrical member to define an auxiliary fluid chamber which is communicated through an orifice passage to the main fluid chamber. The diaphragm member is disposed separate and independent from the elastic support member, thereby enabling damped vibration frequencies to be tuned within a low frequency region corresponding to engine shake and/or idling vibration, regardless of the rigidity of the elastic support member.

Abstract: An ERF (electrorheopectic fluid) filled engine mount has a main working chamber and first and second auxiliary chambers. An orifice passage structure provides fluid communication between the main and first auxiliary chambers. A first set of electrode plates are disposed in the orifice passage structure in a manner which permits the viscosity of the ERF to be selectively controlled. The first auxiliary chamber exhibits a relatively small expansive spring characteristic. A transfer port provides fluid communication between the main working chamber and the second auxiliary chamber. The second auxiliary chamber exhibits a relatively large expansive spring characteristic and functions to attenuate relatively high frequency vibration. An on/off type valve device is disposed in the transfer port.

Abstract: A hydraulically damped rubber mounting in which a liquid filled working chamber 1 is bounded in at least a first partial area by a plate 3 which is made of a magnetizable material and supported on a spring 2. Depending upon the parameters, the plate 3 can be moved back and forth in direction of the working chamber 1 by means of a magnetic system. The transmission of acoustically effective vibrations via the rubber mounting can thus be suppressed.

Abstract: A fluid-filled cylindrical elastic mount having an elastic body between an inner and an outer sleeve, a movable member movably disposed in a pressure-receiving chamber defined by the outer sleeve and the elastic body, a rigid member cooperating with the outer sleeve to define a space diametrically opposite to the pressure-receiving chamber in a load-receiving direction of the mount, and a partition member having a flexible portion and dividing the space into two sections one of which serves as an equilibrium chamber disposed diametrically opposite to the pressure-receiving chamber. The movable member and the inner surface of the pressure-receiving portion define a fluid resonance portion for isolating high-frequency vibrations. An orifice passage is spirally formed for fluid communication between the pressure-receiving and equilibrium chambers, for damping low-frequency vibrations.

Abstract: An isolator for seismic activity including an upper level for supporting an object to be protected, an intermediate level, and a lower level for attachment to the floor or other structure. An interconnection is provided between the upper and intermediate levels to permit relative movement between the levels along a first axis, and a similar interconnetion is provided between the intermediate and lower levels to permit relative between along a second axis perpendicular to the first axis. Each of the interconnections includes one or more bars mounted on one of the levels and defining guide faces oblique to the axis of movement, and a lever pivotally mounted on the other of the levels with a roller for engaging the guide faces, with a spring biasing the roller toward the guide faces. The interconnection also includes tracks and bearings riding on the tracks to provide the interface movement between the levels.

Abstract: A hydro-elastic support mounted between two mechanical elements, subjected to excitations of variable frequencies, and able to provide two levels of stiffness by simple outside control includes an elastic vault adapted to be fastened to one of the mechanical elements, a support adapted to be fastened to the other mechanical element, an upper fluid chamber, a compensation chamber limited by a membrane, a helical duct providing a communication of the fluid between the two chambers, and a central piston for compensation of movement of the fluid from the upper fluid chamber to the compensating chamber. The piston can be immobilized by any time by an integrated mechanism that can be controlled remotely.