Abstract: A vibration isolation system in which a supported body is supported from a vibration excitation body which is prone to vibrate at a predominant frequency and to impart such vibratory forces and motions to the supported body. The isolation system is of the antiresonant type and operable to provide vibration force and motion isolation of the supported body from the vibration excitation body both axially along and rotationally about three mutually perpendicular axes, thereby giving the supported body six degrees of vibration isolation from the vibration excitation body.

Abstract: A mount is disclosed mounting an internal combustion engine in a unitized vehicle body. The mount comprises an intermediate mass which is independent of the vehicle structure and the powertrain and is adapted to be frequency tuned. Separate elastomeric bodies couple the intermediate mass to the vehicle structure and to the powertrain and the intermediate mass is predetermined in combination with the elastomeric characteristics of the coupling bodies so as to resonate at a frequency within an uncoupled intermediate frequency range such that the transmissibility of the mount is attenuated substantially throughout a high frequency range to reduce vehicle structure noise caused by the engine's combustion process while satisfying other transmissibility criteria at the lower frequencies.

Abstract: An earthquake isolation floor comprises a horizontal plate-like support frame having a generally circular or polygonal configuration, a support frame having a horizontal surface with a similar configuration to that of the fundamental frame in a plan view, but of relatively smaller dimensions, a number of horizontal springs disposed radially between the fundamental and support frames with each of the springs being kept in a preset state, and a number of horizontal dampers disposed radially between the fundamental and the support frames, whereby machinery and tools, etc. to be protected against vibration such as caused by an earthquake are adapted to be mounted on the support frame.

Abstract: An engine mounting structure characterized in that a shock and vibration insulating unit and a vibration cancelling device are provided operatively in parallel with each other between the body structure of an automotive vehicle and the engine mounted on the vehicle body structure, wherein the vibration cancelling device comprises at least one rigid elongated bar having one end portion pivotally engaged by the body structure of the engine and a longitudinally intermediate portion pivotally engaged by the vehicle body structure, and a mass or counterweight member carried by another end portion of the elongated bar whereby the vibrations to be transferred through the shock and vibration insulating unit are at least partially cancelled by the vibrations to be transferred through the vibration cancelling device.

Abstract: A buffer rod is interconnected between an engine and a chassis of a vehicle in addition to the main engine mounts. The rod has a resonance frequency slightly lower than the engine vibration frequency at which resonance in the vehicle cabin is apt to occur. Upon reaching the resonance frequency of the rod, the phase of vibration passing through the rod changes so that instead of increasing the spring modulus of the combination of engine mounts and buffer rod to damp vibrations which would otherwise shake the vehicle, the spring modulus thereof is reduced to a very low value due to the interference between the vibration passing through the mounts and the buffer rod. This sudden softening of the engine suspension as a whole, damps the engine vibrations which would otherwise induce resonance in the vehicle cabin.

Abstract: A vibration isolation system includes a seismic restraint assembly that attenuates forces above a chosen magnitude transmitted to a unit from a support during a seismic event. Vertical friction elements on a vertical frame engage and support a vertical damper element. Horizontal friction elements on a horizontal frame engage and retain a horizontal damper element. One frame is connected to the unit, the other to the support. The vertical and horizontal damper elements interconnect, but lost motion spacing between these elements ordinarily prevents low level vibrations being communicated therethrough. Each of the vertical and horizontal friction elements is spring biased into a predetermined frictional engagement with its associated damper element. The force of the engagement is adjustable to adjust the level at which higher than ordinary forces that are being transmitted through the assembly will begin to be attenuated by slippage of the frictionally engaged elements.

Abstract: A horizontal seat suspension for a vehicle for isolating horizontal ride vibrations for low frequencies normally found in large tractors, or other off the road vehicles, a provision for adjusting the seat to a desired position, and also a provision for selectively locking or activating the horizontal suspension.

Abstract: An improved laser gyro dither mechanism is shown utilizing a three-spring suspension system which isolates dither vibrational energy generated within the gyro and prevents that energy from passing to the mounting case of the laser.

Abstract: An improved dot matrix type printer including a carriage mechanism for a printer head having a plurality of printer elements aligned immediately before a platen adapted to carry a sheet of paper to be printed and along a direction parallel to the axis of the platen, the carriage mechanism comprising a balancing mass, a first resilient member which is adapted to connect the balancing mass to the printing head, and a second resilient member which is adapted to connect the balancing mass to a base structure member.

Abstract: A vehicle seat suspension for isolating vertical ride vibrations at low frequencies normally found in larger tractors or other vehicles, and to do this without penalty of large static deflection normally required to obtain similar isolation in the typical mass-spring damper isolation suspension system.

Abstract: A suspension system for a washing machine including a tub assembly having an outer stationary tub and an inner clothes receiving tub mounted for rotation on a central shaft extending downwardly through the lower wall of the stationary tub, comprises a first support cup defined in the base of the washing machine, support legs spaced about the periphery of and attached at first ends to the outer tub and at opposite ends to a second support cup shaped complementarily to the first cup. In a preferred embodiment, the shape of the support cups is a truncated hemisphere. The second support cup is received in the first cup to support the tub assembly on the base. A plurality of spring members are provided about the periphery of the outer tub, extending between the last mentioned tub and base to aid in stabilizing the tub assembly.

Abstract: An oscillation dampening system composed of masses, in which a spring and dampeners are clamped together and coupled to a railroad track to prevent the formation of ripples on the track. The system is tuned to the characteristic frequency of the railroad track and is coupled thereto to reduce the maximum amplitude of oscillation at the characteristic frequency and to shift the occurrence of other amplitudes of oscillation to frequencies away from the characteristic frequency and to reduce the amplitudes of oscillation at the shifted frequency. The maximum of the shifted amplitudes of oscillation is reduced by ten percent from the maximum at the characteristic frequency.

Abstract: Apparatus for truck-mounting of vibrational seismic energy transducers, particularly shear wave transducers, that provides improved vibrational damping and energy coupling into the earth. The apparatus consists of a four column, hydraulically actuatable suspension system operative from the truck or carrier frame as opposite side pairs to support a box frame under which the vibrator and earth coupling assembly is supported by a system of lateral and vertical springs. The vibrator assembly is entirely supported by means of left and right transverse springs to transmit reactive forces resulting from isolation through the box weldment and four columns to the vehicle body. Thus, the vibrator and its associated base plate structure is entirely supported from the vehicle and positioning assembly by resilient means having the requisite interactive constants.