Abstract: An apparatus for isolating and leveling a machine foundation with respect to a substructure of a building or the ground. The apparatus of the present invention provides an enclosure connectable to the machine foundation. A load bearing member is disposed within and adjustably connected to the enclosure. A resilient member is positioned between and in contact with the bearing member and the substructure for supporting and isolating the machine foundation from the substructure and providing a leveling mechanism to level the machine foundation. At least one gauge extends between the bearing member and the substructure to determine the distance between the bearing member and the substructure so that the machine foundation may be leveled. Additional stabilizers are provided with an anchor plate assembly adjustably connected to the enclosure. The stabilizers include an isolating member biased against a sidewall of the substructure by the anchor plate assembly to provide added stability to the machine foundation.

Abstract: A horizontal-motion vibration isolation system for supporting an object in an equilibrium position relative to a base while suppressing the transmission of horizontal vibratory motion between the object and the base includes a plurality of columns, each column having a rigid member with a first end and a second end. A tilt mechanism is operatively connected to each first end of the rigid members and the object. Likewise, a tilt mechanism is operatively connected to each second end of the rigid members and the base. Each tilt mechanism exhibits a tilt rotational stiffness and the horizontal translation of the object relative to the base causes tilt rotation of the columns. The tilt rotational stiffness of the tilt mechanisms is approximately proportional to the compression load transmitted to the columns by the weight of the object, so that the horizontal natural frequency of the system is nearly insensitive to the payload weight.

Abstract: Torque roll, such as in a marine propulsion unit for driving a propeller, is significantly reduced or substantially eliminated by utilizing inflatable elements, such as airbags. One or more airbags engage the top of a propulsion unit mounting surface supported by an elastomeric isolation mount where a torque roll force is substantially upward, and one or more other airbags engage the bottom of a mount for the propulsion unit at a location where the torque roll force is substantially downward. The amount of gas supplied to the airbags is preferably substantially proportional to the torque roll force at each of the airbags. By significantly reducing or substantially eliminating the torque roll of the propulsion unit, the unit can be connected to other components without line shaft couplings.

Abstract: This invention provides an improved shock eliminator, particularly a shock eliminator for use in constructions such as bridges and houses. The shock eliminator includes a base, a carrier seat, a slide block and springs. The top side of the base is provided with a round curved concave slide recess. The slide block has a bottom surface formed with a curved surface equivalent to the slide recess in diameter and disposed in the slide recess, and a top side centrally provided with a hemispherical depressed coupling groove. The carrier seat is a plate member disposed on the top portion of the slide block and has a bottom portion centrally provided with a coupling post having a hemispherical distal end equivalent to the depressed surface of the coupling groove in diameter. The coupling post is disposed in the coupling groove of the slide block. A suitable number of springs are disposed on the surface of the slide block around the coupling groove to hook the bottom side of the carrier seat.

Abstract: A control section 51 outputs to a pulse width modulation section 55 a reference signal C which corresponds to a frequency and an amplitude of signals sent from a vibration generation source. The pulse width modulation section generates a drive control signal K by pulse width modulation, so that based on this drive control signal K, an electromagnetic valve 45 is turned ON/OFF. Each time it is turned ON/OFF, connection of an air chamber X1 is alternately switched between the side of an inlet port 41 and the side of the atmosphere. The drive control signal K is pulse-width modulated corresponding to an amplitude of the reference signal C and is composed of at least the same number of pulses corresponding to a duty ratio-changed frequency as that of each one period of the standard signal. The drive control signal K is synchronized with the standard signal S.

Abstract: The invention concerns a launch vehicle comprising a shroud (1a, 5a) supporting auxiliary propellers (2, 3) applying in operation excess flow of stresses to the shroud (1a, 5a), said device comprising means for coupling the payload (4) with the launch vehicle shroud. The invention is characterized in that the coupling means are designed to ensure a mechanical coupling between the payload (4) and the shroud along the direction of the launch vehicle longitudinal axis (X), and to cause them to be disengaged along radial and tangential directions. The invention is useful for neutralizing the effects on the payload of excess stresses applied on the launch vehicle shroud by the auxiliary propellers (2, 3).

Abstract: Control data such as an optimal filter coefficient or the like of an engine mount is obtained by adaptation control or the like with respect to a reference vehicle F provided with a reference engine mount 20k, and the control data is stored in a reference data map storage medium 35 as a reference data map. Mount characteristics of the reference engine mount and a mass-produced engine mount 20m are measured. A correction data map which is a deviation from the reference data map is obtained for the control data of the mass-produced engine mount from a difference between both the mount characteristics, and the correction data map is stored in the correction data map storage medium 36. Both the data map storage media are added to the active control apparatus of the mass-produced vehicle M. Using both the data maps, it is possible to appropriately and actively control the vibration of the mass-produced vehicle without variation.

Abstract: A magneto-spring structure includes a lower frame and an upper frame vertically movably mounted on the lower frame via a link mechanism. The upper and lower frames have respective permanent magnets secured thereto, with like magnetic pole opposed to each other. The link mechanism includes a plurality of links and a connecting member for rotatably connecting them via a bearing. The links are made of non-magnetic material, while the bearing is made of ferromagnetic material.

Abstract: A fluid-filled elastic engine mount including an elastic body elastically connecting two mutually spaced-apart first and second mounting members and partially defining a pressure-receiving chamber filled with a non-compressible fluid, a flexible diaphragm partially defining an equilibrium chamber whose volume is variable, a movable oscillating plate partially defining the pressure-receiving chamber, an oscillating device for oscillating the movable oscillating plate for controlling pressure of the fluid in the pressure-receiving chamber, a first and a second orifice passage for effecting fluid communication between the pressure-receiving and equilibrium chambers. The first and second orifice passages are tuned to a low frequency band corresponding to an engine shake vibration and a medium-frequency range corresponding to an engine idling vibration, while the first and second orifice passages are disposed parallel to each other.

Abstract: A whole-spacecraft passive isolation system consisting of a plurality of titanium flexures that act as soft springs to isolate a satellite from its launch vehicle is improved by the addition of piezoceramic wafers attached to the flexures. A low-pass filter feedforward controller is used to cancel out disturbances by applying out-of-phase signals to the piezoceramic wafers thereby creating a hybrid isolation system that significantly reduces the dynamic loads on the spacecraft.

Abstract: A vibration isolation system having at least three vibration isolation units. Each of the units preferably has the same general configuration. The isolation units each include a support stand having three (3) adjustable feet for adjustably supporting and leveling the isolation units on the floor of the site of operation of the precision equipment desired to be isolated. The units further include a fluid tight cylinder. The fluid tight cylinder is connected to the support stand via three uniformly spaced rods in such a fashion that allows horizontal movement of the cylinder relative to the support stand. A fluid is disposed in a chamber formed intermediate the fluid tight cylinder and the support stand thereby providing a thin film viscous shear damper for damping excitations having a horizontal component. The fluid tight cylinder is sealed by a diaphragm. A piston is positioned directly above the diaphragm. A pair of stops limit the upward and downward movement of the piston.

Abstract: A dampening bearing support member having a plurality of bearings disposed between an object and a base with rheological fluid disposed around the bearings and structure to retain the rheological fluid in such position, with the rheological fluid being under the control of the user at times when it is desired to stiffen the rheological fluid and limit or prevent movement of the bearings and the object in relation to the base.

Abstract: A stabilization system protects a structural member from the effects of seismic disturbances. Pendular isolators are positioned between a structure fixed to the ground and the structural member, which is movable and which is sought to be protected, such as a complete building, a building slab upon which sensitive equipment is used, or a bridge deck. The pendular isolators can be rods extending between the building and the slab floor, wherein ends of rods connected to the slab floor include a spherical friction knuckle joint or bearing, i.e., knuckle element/socket assembly. Alternatively, each pendular isolator can be a set of supports movable relative to each other and connected by at least one rod having a knuckle joint at each end thereof. The friction at the knuckle joint is utilized to provide a damping of the seismic disturbance, thereby permitting only limited relative movement between the fixed structure and the movable structural member in the event of a seismic disturbance.

Abstract: A vibration mechanism having a magnetic spring includes a lower frame, an upper frame vertically movably mounted on the lower frame via a plurality of link mechanisms, and at least two permanent magnets mounted on the lower frame and the upper frame, respectively, with the same magnetic poles opposed to each other. A plurality of springs are connected to the link mechanisms to produce a lifting force of the upper frame. The total spring constant of the permanent magnets and the springs is partially set to a negative value or substantially zero.

Abstract: An antivibration device having two rigid strength members interconnected by an elastomer body has first and second abutments extending in parallel to limit relative movement between the two strength members along a determined axis and in a determined direction. The second abutment is less stiff than the first abutment, and it comes into contact with its corresponding counter-abutment before the first abutment comes into contact with its corresponding counter-abutment.

Abstract: A vibration isolation system having at least three vibration isolation units. Each of the units preferably has the same general configuration. The isolation units each include a support stand having three (3) adjustable feet for adjustably supporting and leveling the isolation units on the floor of the site of operation of the precision equipment desired to be isolated. The units further include a fluid tight cylinder. The fluid tight cylinder is connected to the support stand via three uniformly spaced rods in such a fashion that allows horizontal movement of the cylinder relative to the support stand. A fluid is disposed in a chamber formed intermediate the fluid tight cylinder and the support stand thereby providing a thin film viscous shear damper for damping excitations having a horizontal component. The fluid tight cylinder is sealed by a diaphragm. A piston is positioned directly above the diaphragm. A pair of stops limit the upward and downward movement of the piston.

Abstract: A stabilization system protects a structure, comprising at least a slab and having a foundation formed in the earth, from the effects of seismic disturbances. Pendulum support elements, secured at upper ends to respective support columns affixed to the foundation and at lower ends to support positions of the slab, support the slab while permitting limited relative movement between the slab and the support columns in the event of a seismic disturbance. A damping system connects the slab to the foundation to impede action of forces tending to produce relative rotation between the slab and the foundation and to provide damped control of relative linear displacements therebetween. A level monitoring system monitors the respective levels of monitoring positions displaced about the slab and detects differential changes in the levels at the monitoring positions, the rods being adjustable to correct for such differential changes and thereby to reestablish a common level condition at all monitoring positions.

Abstract: A semi-active control method for a controllable fluid damper used in seat supports. The present method filters a relative displacement signal phase shifting the relative displacement sine wave by an angle from greater than 0.degree. through an angle less than 90.degree. to get a relative rate. The sign of the relative rate is compared to that of an absolute velocity curve obtained by integrating the absolute acceleration value obtained by an accelerometer attached to the controlled seat. If the signs are the same, the output to the damper is set to a minimum; if the signs are different, the value is set at the absolute velocity multiplied by an input gain. Endstop limits can be implemented with this control method.

Abstract: A vehicle seat mounting mechanism including oppositely disposed pairs of parallel links between a base and a seat carrier, and a first air bag spring operatively connected between the base and the links for absorbing vertical-upward motion induced by road shocks, and a second air bag spring secured between the base and the seat carrier for absorbing vertical-downward motion induced by road shocks. A separate shock absorber mounted between the base and the seat carrier serves to dampen the springing action of the first and second air bag springs.

Abstract: Piezoelectric actuators bonded on S-shaped brackets extend between a support and a payload. The brackets can be used for vibration isolation by attenuating resonant vibrations under computer dynamic control relying on predetermined dynamic resonant characteristics and H-Infinity control methods. The brackets can also be used for platform directional pointing under computer control.

Abstract: An active seat suspension system for equipment that transfers vibration to a human operator provides human body vibration control and, thus, a more comfortable environment for the operator. The system utilizes a "man in a loop" control strategy, where both the equipment and human operator model are analyzed as a dynamic system. The seat suspension parameters are evaluated through optimization, which assumes, under normal stochastic conditions, that the vibratory inputs to the system are unknown. A controller estimates their values in real time, and a preferred characteristic force between the seat and machinery is determined. The characteristic force determined minimizes a cost function. Using an output from the controller, an actuator (which may be either active or semi-active) substantially applies the characteristic force between the seat and machinery, resulting in reduced vibration being transmitted to the human operator.

Abstract: The present invention relates to a device for a motorized aircraft, said device having a room for containing an inspection apparatus, said device comprising at least two elements, a first element absorbing essentially vibrations with a frequency higher than a specific frequency, while the second element absorbs essentially vibrations with a frequency lower then said specific frequency, said first and second elements being linked together and placed the one with respect to the other, so that the .second element is adjacent to the said room. The invention relates also to an aircraft, such as a helicopter, with a camera placed in such a device.

Abstract: A supporting device for supporting a member having an inside movable portion includes a main frame, a supporting reference plate on which the member is to be placed and a plurality of driving mechanisms each being disposed between the main frame and the supporting reference plate and each having a high-rigidity displacement providing element and a low-rigidity supporting element of low damping factor, disposed in series.

Abstract: An optical tabletop which has dampers located in the corners of an optical tabletop are each a suspended mass through which passes threaded rods. The suspended mass is submerged in a viscous liquid. Adjustment of the rods allows the optical tabletop to be tuned.

Abstract: A vibration cancellation system having a fluidic driver providing fluid pressure differential and flow to an actuator having a reaction mass. The pressure differential drives the reaction mass so that the actuator's oscillations cancel any vibrations emanating from a vibrating structure mounted thereto.

Abstract: A seat suspension is provided that has a damper unit which is connected between the seat and the chassis on which the seat is mounted. The damper can be switched between soft and hard settings. The damper switching is controlled based on the relative position of the seat and one of the relative or absolute velocity of the seat. When the seat and the chassis are moving in the same direction the damper is set to soft, (producing a low damping effect), while when the seat and chassis are moving in opposite directions the damper is switched to hard (producing a high damping effect).

Abstract: Disturbing forces, such as linear forces or torques, exerted on a structural member 12 of an inertially servoed structural interface placed between two assemblies are nulled by the application of a responsive corrective inertial force or torque to the structural member. The force on the structural interface is sensed by a force sensor associated with the member. In an embodiment of the present invention for nulling linear disturbing translational forces, a servo control loop 18 is responsive to a linear translational force sensor and drives a linear actuator 22 that applies a corrective inertial linear translational force to the structural member 12 so as to null the force exerted thereon. In an embodiment of the present invention for nulling torsional disturbing forces, the servo loop 18 is responsive to a torsional force sensor 44 and drives a torque motor 42 that applies a corrective inertial torsional translational force to the structural member 12 so as to null the force exerted thereon.

Abstract: A vibration isolating device comprises a base, a plurality of support members each placed onto the base and comprised of a two series layer of an electroviscous body and an elastomeric body, and a cradle supported through these support members. These support members are provided with circuit for applying voltage to each electroviscous body, respectively.

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 damping subsystem protects a structure from the effects of seismic disturbances and employs at least a first pair of first and second damping and transformation mechanisms including respective, associated first dampers oriented in parallel relationship in a first direction and oppositely disposed relatively to the center of gravity of the structure and mechanically connected between respectively corresponding portions of the structure and the foundation in relatively inverse relationship. Each mechanism transforms a force transferred to the associated first damper from the foundation in the first direction and/or any lateral, relative displacement of the corresponding structure and foundation portion in the first direction to a corresponding force and/or displacement, respectively, in a second direction perpendicular to the first direction, each also performing the reverse transformation.

Abstract: A vibration cancellation mount for use in a vibration cancellation system is provided that includes a fluidic driver providing a modulated air stream to an elastomeric air spring. The pressure of the air stream is caused to fluctuate by an acoustical cancelling signal generated by an electroacoustic transducer electrically coupled to cancellation controller. As this pressure varies the air spring is filled and vented so that it responds at the same frequency and phase as the cancellation signal and thereby cancels the vibrations emanating from a vibrating structure mounted thereto. By employing a fluidic driver, the vibration cancellation mount is not frequency limited and can cancel vibrations having frequencies anywhere in the audio frequency spectrum.

Abstract: A seat suspension includes a device which is responsive to a sensor which detects the condition of the road surface being traversed by the vehicle in a manner to produce relatively hard suspension characteristics when the vehicle is running on a rough road and softer characteristics when traversing a road having a smooth surface. The suspension of the vehicle if equipped with variable hardness type shock absorbers can be controlled in parallel with the seat suspension to improve the ride. Additional sensors which sense parameters such as acceleration, braking, steering angle, vehicle speed etc., can be used to control the setting of the seat suspension in addition to the basic road condition control.

Abstract: A mounting device includes an elastomeric body formed with first and second recesses which define a working chamber and an expansion chamber which are filled with an ERF (electrorheological). The recesses are enclosed by an annular member to define the chambers. First and second helical orifice passages formed about the periphery of the annular member fluidly connect the chambers. A cylindrical outer casing which encloses the elastomeric body and annular member is grounded to act as a first electrode. Strips disposed in the orifice passages act as electrodes on which voltages can be selectively and separately impressed.

Abstract: A hydraulic mount assembly is disclosed having a partition forming two hydraulic chambers and including a damping decoupler. A primary chamber is formed by an elastomeric member and a secondary chamber by a resilient diaphragm. During dynamic loading of the mount, fluid passes through an orifice between the two chambers of the mount causing expansion and contraction of the diaphragm. An expandable, pneumatic bladder is mounted within the primary chamber. A tube provides fluid communication between the bladder and the atmosphere. When a valve in this tube is open, air freely enters and escapes the bladder in symphony with the vibrating mount. Alternatively, the valve may be closed and a positive pressure provided to the bladder from a variable pressure fluid supply. By actively controlling bladder expansion and contraction in this manner, the dynamic rate of the mount assembly may be selectively reduced at relatively high vibration frequencies; that is, those over 20 Hz.

Abstract: A blower support device for supporting a blower on the frame of a laser generator includes a plurality of air-mounted isolators disposed on the laser generator frame, an air-mounted base supported by the plurality of air-mounted isolators, and a plurality of guide rails provided on the air-mounted base for supporting a surface of the air-mounted base. A plurality of wheels are provided on the blower and engaged with the guide rails. The blower support device may also include an air pressure source and regulator for constant supply of air pressure and individually and freely regulated air pressure to the air-mounted isolators.

Abstract: A counterbalancing mechanism allows a weight or constant force to be counterbalanced for any practical linear range of travel, including means for effortlessly adjusting the mechanism for a constant force or load of any practical magnitude. A load support slides along an axis substantially passing through a fixed lower pivot point. The load support member is pivotally connected to the top end of an upper lever arm. The upper lever arm is pivotally connected by a horizontal link to the upper end of a lower lever arm that is pivotally connected to the fixed point. A pully that may swivel about its swivel axis embraces the axis and guides a cable connected to the horizontal link at one end to a spring assembly at the other end. The spring assembly may be adjusted.

Abstract: A spring for resisting relative movement of parts and for urging the parts to an initial, equilibrium position when the parts are moved therefrom includes a cylindrical hub concentric within an outer cylinder. The hub is fixedly connectable to one part and the outer cylinder is fixedly connectable to another part. An inner cylinder is concentric between the hub and the outer cylinder. A plurality of elastomeric spring members is connected between the hub and the inner cylinders and between the inner and outer cylinders to define two annular sealed fluid chambers. A fluid is disposed within each chamber. A variable energy field is applied across the fluid in one chamber to control its resistance to flow. Another variable energy field is applied across the fluid in the other chamber to control its resistance to flow. Each energy field is adjustable independent of the other.

Abstract: A structure stabilization system for protecting structures from effects of seismic disturbances. Plural bases of a base isolation system support, through flexible suspension elements, corresponding, plural vertical support columns. Corresponding adjustment mechanisms on each base provide for adjusting all support elements to a common elevation. A gripper mechanism in each base is selectively, axially adjustable to establish substantially identical, effective free suspension lengths and common harmonic characteristics of all suspension elements. A releasable interlock subsystem interlocks the structure to the foundation to render it stable against minor forces, such as produced by wind, and automatically releases the structure to permit same to float in support by the base isolation system in response to forces exceeding a predetermined level.

Abstract: A hydraulic mount assembly is disclosed having expandable primary and secondary fluid chambers, an orifice track for damping action and a damping decoupler. During low level dynamic loading of the mount, hydraulic pressure activates the decoupler. At higher level loading, fluid passes through the orifice track between the two chambers providing the damping action. An expandable pneumatic bladder is mounted within the primary chamber. A control system including two one-way valves governs ingress and egress of outside air to the pneumatic bladder, thereby selectively reducing the overall damping and dynamic rate characteristics in response to sensed vehicle operating conditions. This reduction is accomplished by allowing the bladder to inflate with air providing a relatively soft, engine isolating mount. Alternatively, the control system allows controlled bladder deflation, selectively returning the mount to relatively hard characteristics.

Abstract: A two-chamber engine mount with hydraulic damping has a partition arranged between a working space and an equalization space. The partition is formed in a first subarea by a disc movable between stops. The play of the disc between the stops can be varied by a motor. In a second subarea, the partition is penetrated by a first choke canal. A second choke canal can be added to the first choke canal in series or parallel therewith by a motor.

Abstract: This invention relates to a method and apparatus for reducing vibration of a helicopter fuselage. The apparatus comprises a plurality of actuators interconnecting parts of the helicopter structure capable of relative motion at an exciting frequency, means to continuously oscillate the actuators at a frequency corresponding to the exciting frequency, a plurality of accelerometers attached to the fuselage for generating signals representative of fuselage dynamic accelerations, and processing means for processing said signals and providing output signals for controlling the phase and magnitude of operation of the actuators. In a described embodiment, one of the relatively movable parts comprises a raft structure carrying the gearbox and engines and attached to the fuselage by a resilient attachment adjacent each of its four corners.

Abstract: Disclosed is a file memory unit having a casing for accommodating a head positioning mechanism and a magnetic recording disk virtually in sealed manner, and a frame for supporting the casing resiliently. The unit has the provision of a shock absorbing facility for absorbing the vibration created by the head positioning mechanism and the vibration and impact applied from the outside. The shock absorbing facility has a unitary structure having a first spring constant for absorbing relatively small vibration created by the casing, a second spring constant for absorbing the vibration applied from the outside, and a third spring constant for absorbing the impact applied from the outside.

Abstract: An adjustable engine mount for shielding a vehicle body from oscillations of a drive unit, in which the magnitude of the damping and of the spring rate is controlled as a function of control signals of an electronic control unit. For adjusting the damping, the engine mount has an actuating device, by means of which the size of a throttle cross section between a first chamber and a second chamber of a damping chamber can be adjusted. For adjusting the spring rate, the engine mount has an air cushion which functions like a pneumatic spring element, which can be inflated and vented via a valve device. The electronic control unit has inputs for various input signals, which describe parameters that influence the motion of the drive unit relative to the vehicle body. The electronic control unit controls the damping and the spring rate of the engine mount as a function of the magnitude of at least one of the input signals.

Abstract: A hydraulic mount assembly includes a pair of mounting members connected to each other through a hollow elastomeric body of natural or synthetic rubber. The body is closed by a resilient diaphragm so as to form a cavity for damping liquid. A partition or plate is provided to divide the fluid filled cavity into two distinct chambers. A primary chamber is formed between the partition and the interior wall of the hollow body. A secondary chamber is formed between the partition and the interior wall of the diaphragm. The partition includes at least two passages connecting the two chambers. A sliding gate extends across the entry to the passages. This gate is displaceable to direct the flow of fluid between the primary and secondary chambers through a selected passage or passages in the partition. A solenoid actuator mounted on the partition includes multiple electric coils that allow the positive positioning of the gate.

Abstract: The invention provides a hydraulic antivibratory support interposed between a vehicle chassis and engine, including a work chamber (A) and a compensation chamber (B) filled with liquid and joined together through a nozzle (19) whose section, which determines the frequency of the best damped oscillations, can be modified even during operation of the support. This nozzle is defined at least partially by a deformable wall (20) and modifications of the section of the nozzle are obtained by deforming the wall.

Abstract: A dual-chamber support bed or motor vehicle engine mount with hydraulic cushioning includes a resilient housing part and a support base for use in defining a working chamber and compensating chamber filled with liquid, the housing walls are annular rubber diaphragms with a buckling characteristic that is adjustable to adapt to the operating load. The chambers are connected to one another through a nozzle channel. Means for controlling the buckling characteristics (buckling rigidity) are provided in a wall of the working chamber and in a preferred embodiment include an additional buckling spring that is clamped into the fixed base housing and is adjustable in its buckling behavior from the exterior by a spindle.

Abstract: A mount for a record player with variable antivibration controls that make it possible for the user of the player to separately establish an optimum antivibration setting depending on the conditions of the specific surface that the player is resting on and on the overall acoustical conditions with respect to footstep and acoustical feedback.

Abstract: A casing accommodating a liquid is divided by a partitioning member into two sections. The partitioning member is secured to either an engine or vehicle body,and the walls of the two sections facing the partitioning member are secured to the enging or vehicle body, to which the partitioning member is not secured. The partitioning member is provided with an orifice mechanism which can vary the state of communication between the two sections. When the engine is going to roll, the orifice mechanism is controlled to restrict the communication between the two sections to increase the damping force, whereby the rolling of the engine is prevented.

Abstract: An engine mounting arrangement is disclosed including a rubber-metal component and a vibration attenuating device that is comprised of a lever arm provided with a mass on its free end. The low frequency as well as the high frequency oscillations are damped thereby without establishing a noise bridge between the engine and the vehicle by the lever arm extending between elastomeric members and bearing in the axial direction of the engine mounting arrangement against these elastomeric members.

Abstract: An adjustable slide in a seat suspension is connected through a plate to a link of a parallel linkage, and one end of a shock absorber is connected to the slide. The other end of the shock absorber is connected either to a support for a seat guided by the parallel linkage of a suspension or to a base to which the parallel linkage is connected. Means for changing the distance of the slide over the plate from an adjacent pivot adjusts stiffness or quality of ride.