Abstract: An apparatus includes an array of seismic sensor units that are adapted to acquire measurements in connection with a land surface-based seismic survey. Each seismic sensor unit includes a particle motion sensor and a rotation sensor.

Abstract: A print-head assembly for a printing apparatus includes: a carriage with a frame configured to be supported on a gantry for movement in a travel direction over a print surface; a print-head unit having one or more print heads mounted on the carriage; and an impact damping device mounted on an end region of the carriage in the travel direction, wherein an impact member of the damping device presents a contact surface in the travel direction. The impact member is mounted to the carriage frame for resilient movement over a buffer distance substantially parallel to the travel direction between a first extended position and a second retracted position for absorbing or damping an impact during movement of the carriage in the travel direction.

Abstract: An air dampening assembly for an electronic device comprises a base member. A first piston housing is disposed on the base member. A second piston housing is disposed on the based member opposite the first piston housing. A sliding member is disposed between the first and second piston housing. A first piston is disposed on a first elongated member of the sliding member. The first piston housing is configured to receive the first piston. A second piston is disposed on a second elongated member of the sliding member. The second piston housing is configured to receive the second piston.

Abstract: In an active vibration isolation support system in which internal pressures of fluid chambers whose volumes are changed by a load applied from outside are controlled by an actuator that reciprocatingly vibrates a movable core on an axis by energizing a coil cylindrically wound around an outer periphery of a fixed core, an end surface of the coil on the fluid chambers side is inclined so that a radially outer side of the end surface is close to the fluid chambers with respect to the axis. Therefore, the output can be increased by increasing the number of windings of the coil without increasing the dimension of the active vibration isolation support system in the direction of the axis.

Abstract: A load weighting control apparatus that suppresses deterioration of a controlled object due to impacts or the like during control, and for which energy usage costs required for control are markedly reduced, and that has a simple structure and therefore inexpensive manufacturing costs and running costs. The apparatus includes a main vacuum cylinder provided with a cylinder tube, end walls, an air vent that passes through one end wall, a valve that is provided in the air vent and serves to open/tightly close the atmosphere inside of the cylinder tube to the outside, a piston that slides back and forth within the cylinder tube, and a piston rod that is linked to the piston and passes through the other end wall and an auxiliary vacuum cylinder that includes a slacking portion where a piston rod produces slackness in the main vacuum cylinder.

Abstract: Disclosed herein is a spring structure for a bed mattress which comprises a body spring formed in a coil shape, upper and lower end springs wound and extending horizontally at upper and lower portions of the body spring, an exposure wire spring formed integrally with the upper end spring in such a fashion as to be disposed above the upper end spring, and a connection end portion for integrally connecting the upper end spring and the exposure wire spring to each other, wherein a first contact-preventing end 30 is formed at the connection end portion in such a fashion as to be bent inclinedly upwardly from a distal end of the upper end spring positioned outwardly from an uppermost winding of the body spring.

Abstract: Problem: To reduce vibration and noise of a bracket and the like, and also to save a work for manufacturing and shorten manufacturing time, in the case that a forced-excitation of a vibrating apparatus is a cause. Solution: There are provided a frame body 1, to which a rotation motor 6 is fixed, and dynamic vibration absorbers 2, 3 which are structured in a manner such that slits are made in a portion of the frame body 1 and the slit part is bent in an upward direction, and is configured so that the vibrating portions 2a, 3a of the dynamic vibration absorbers 2, 3 vibrate in the vibrating direction of the frame body 1 being vibrated by the rotation motor 6.

Abstract: In an apparatus for connecting a structural member (12) with a structural unit (2), an oscillation device (4) serves for absorbing impulses or vibrations. It is excited by impulses or vibrations around oscillations about a first point (7) which lies on or near a natural oscillation nodal point. The structural member (12) is rotatably supported in the first point relative to the oscillator. A damping device (30) has an effective component which lies in basic oscillation in the direction of motion of the first point, and serves for damping a basic oscillation. An optional additional classic dynamic vibration absorber is tuned to the basic oscillation of the oscillation device. The fields of application are extremely manifold and range from oscillation-absorbing and shock-absorbing supports (for hard disks, cameras, illuminants, mirrors, microphones, motors etc.

Abstract: A screw type inerter mechanism includes a screw with a limit portion and a thread portion with threads; a screw cap engaged with the thread portion of the screw; an inertia body fixed to the limit portion of the screw; and a connection body engaged with the limit portion of the screw wherein an axial of the screw serves as a rotation axial for the screw to rotate relatively to the connection body. Thus, when a non-zero external force is applied to the inerter mechanism to generate relative horizontal displacement between the screw cap and the connection body, the screw cap brings the screw to rotate, which further brings the inertia body to rotate, thereby achieving the inerter features.

Abstract: Provided is a vibration control mass body, as a mass body used for controlling with a high accuracy a vibration associated with high-speed movement of a movable body such as a stage, which is large-sized and to which a complicated shape can be imparted. The vibration control mass body (100) includes a plurality of platy members (10, 20). The plurality of members (10, 20) are respectively made of a tungsten alloy. The tungsten alloy contains, as a chief ingredient, tungsten of greater than or equal to 80% by mass and less than or equal to 99% by mass. The vibration control mass body (100) is used in a staging unit having a movable body in order to control a vibration associated with movement of the movable body.

Abstract: System for and method of active vibration isolation to isolate a payload (57) from earth movements. The system has a body (16; 51), a mass (41) supported by the body (51) by means of at least one spring (45), a further mass (39) supported by the mass (41) by means of at least one further spring (43). A sensor senses a distance between the mass (41) and the further mass (39) and generates a distance signal. A controller (49) receives the distance signal and generates a control signal based on the distance signal. An actuator (47) actuates a position of said mass (41) based on the control signal, whereas the further mass supports the payload to be isolated from earth (16).

Abstract: A piezo-hydraulic linear actuator (1) for controlling the vibrations through a piezoceramic element (7) that acts onto a proper liquid placed inside a cavity (3) (similar to a Helmholtz resonator configuration) by means of a flexible metallic membrane (8). The equipment whose vibrations must be controlled is fastened to a mobile plate (4) placed onto anyone of the cavity walls. The cavitation phenomena can be avoided by using two piezoceramic elements (7,9) acting onto the liquid in phase opposition one with respect the other one. The actuator can be designed to control the vibrations on one, two or three axes.

Abstract: A long travel, varying spring rate combination spring includes two differing rate springs connected end-to-end in such a way that the lower rate spring is compressed until positive engagement of a plunger with an intermediate flange member occurs with the higher rate spring thereafter compressed. Each spring may be assembled separately and connected together with a coupling to create a combination spring, allowing various springs to be combined to meet the requirements of a particular application.

Abstract: A pneumatic device selection system has a computer, first through sixth databases connected to the computer and storing data of at least pneumatic devices, a coordinate input unit and a keyboard connected to the computer, for entering input data based on an input action of an operator into the computer, and a display unit connected to the computer, for displaying information from the computer. The pneumatic device selection system functionally has a first selection processor for selecting a cylinder operating system based on input data from the coordinate input unit or the like, and a second selection processor for selecting a shock absorber based on input data from the coordinate input unit or the like and/or a selection result from the first selection processor.

Abstract: A spring suitable for use in bedding construction, including mattresses, mattress-bases and the like which is able to achieve a variety of spring heights and resiliences using the same thickness of wire. The spring includes a first leg (2), a first upper foot (3), a first lower foot (4), a second leg (2), a second upper foot (3), a second lower foot (4), at least one coil spring (5) and linking means (6). The spring's first leg links the first upper foot to the first lower foot and includes at least one coil spring (5) at some point along its length. The spring's second leg links the second upper foot to the second lower foot and includes at least one coil (5) spring at some point along its length. The linking means links the first upper foot to the second upper foot in such a way that the first leg, first upper foot, and first lower foot are oriented at approximately 180 degrees relative to the second leg, second upper foot, and second lower foot.

Abstract: A spring cushion assembly, particularly for mattresses, comprises a plurality of spring coils aligned with one another in parallel linear spring coil rows and parallel linear spring coil columns perpendicular to the spring coil rows, each spring coil being of a configuration producing a tendency to incline laterally when compressed, with each spring coil row and each spring coil column comprising spring coils oriented relative to one another to incline in opposing directions for counteracting the tendency of the spring coils to incline.

Abstract: A spring-containing device comprises a housing including a removable end plate (2). A plurality of screw-threaded tie rods (7) have nuts (28) holding the end plate (2) in assembly in the housing. A safety plate (14) is disposed within the housing at a fixed spacing from the end plate (2) but short of a movable spring-retaining plate (8) at its closes approach to the end plate (2). The safety plate (14) is fast on a shaft (15) rotatable in the end plate (2) and adapted (at 16) to be turned from outside. The safety plate (14) has keyhole-shaped openings through which the respective tie rods (7) extend and the tie rod (7) have safety collars (18) which can only pass through the keyhole-shaped openings when the safety plate (14) is in a certain angular position.

Abstract: A patient lifting device shows a lifting platform (26) connected to an upper column part (16), which is raiseable and lowerable by a jack (18) operated by an electric motor (20). A gas spring (34) is arranged between the upper column part (16) and a lower part (24) of the jack (18) to reduce the load on said jack. The lower part (24) rests on a seat (27), from which it can move in upwards direction. If the lifting platform (26) on lowering is stopped by an obstacle (30) the jack (18) will continue to retract, the lower part (24) together with an arm (28) moving upwards from the seat (27), which arm (28) acts on a switch (32) to break the current to the jack (18), which thereby is stopped.

Abstract: An inertia force balancing apparatus for a machine haivng a reciprocating heavy object, such as a Pilger rolling mill provided with a heavy object stand having a pair of Pilger mill rolls and horizontally supported such as to be reciprocable and with a drive device for imparting reciprocating motion to the Pilger mill stand by a motive power converted from rotational motion, into reciprocating motion. A spring device secured at its end to the heavy object and adapted to balance the inertial force of the reciprocating motion of the heavy object. A control device is provided for changing the spring force of the spring device in accordance with the rotational speed of the rotational motion of the drive device.

Abstract: A self contained gas spring interchangeable with a coil spring comprising a cylindrical body having a constant diameter external cylindrical surface, the cylindrical body having open ends and a piston within said cylindrical body and having one end projecting through one of the openings of the cylindrical body. The piston and the cylindrical body have interengaging flanges that limit the outward movement of the piston relative to the cylindrical body. A plug is positioned in the other end of the cylindrical body to close the opening of the cylindrical body. A charging valve is positioned in the plug for charging the interior of the gas spring. The piston has a hollow inner end with an inner surface tapering outwardly and axially toward the plug. The plug has a generally complementary surface such that the piston can move downwardly about a portion of the plug thereby substantially reducing the height of the gas spring.

Abstract: A system is disclosed for minimizing the transmission of vibrations from a vibratory source through a pair of shafts to a handle mounted transversely to the shafts. The handle is mounted to the shafts through resilient, elastomeric, hourglass-shaped shock absorbers. The mass of the handle and the spring stiffness of the shock absorbers are selected to provide the handle with a characteristic frequency (F.sub.c) such that F.sub.s >.sqroot.2 F.sub.c. To limit axial deflection of the shock absorbers when transverse forces are applied to the handle, each of the elastomeric elements is mounted between and inside a respective pair of nested cups having their open ends facing one another, one cup of each pair being connected to the handle and the other cup of each pair being connected to a shaft.

Abstract: A direction reversal device including a housing and an abutment rod passing through, and movable relative to, the housing, one of the housing and the rod being stationary and the other being arranged to be impacted by a moving unit whose direction of travel is to be reversed, the device also including a resilient connection disposed between the rod and the housing and arranged to have a potential energy storage capacity corresponding to the kinetic energy possessed by the moving unit, and control elements for adjusting the storage capacity and the location of the point of direction reversal of the device.