Vibratory screens and apparatus therefore are disclosed. In some embodiments, a damper is incorporated having a pin and pivot arm which cooperate to dampen high-amplitude vibratory motion of the screen. In some embodiments, a bumper is disposed transversely adjacent to a sidewall of the screen and mounted to a bracket supporting a damper. In some embodiments, one or more guards protect openings in a pivot arm of the damper.

A suspension system (22) configured to minimize transmission of acoustic and vibrational energy in a device, comprising: (i) a rigid support (24); (ii) an operative element (16) positioned within the rigid support and comprising a drive frequency when the device is in operation; and (iii) a resilient element (26) engaging the rigid support and configured to create a resilient force against one or more degrees of freedom of vibrations generated by the operative element; wherein the natural frequency in one or more of the degrees of freedom of the suspension system, in the degrees of freedom of interest, are tuned into a narrow resonant frequency range by the suspension, and wherein the resonant frequency is less than the drive frequency.

A spring system that includes an adjustable spring system that is operated by a motor.

A spring system that includes an adjustable spring system that is operated by a motor.

A shock-absorbing front fork for a bicycle includes an inner part securely inserted in the crown of the front fork. The inner part includes multiple first slots and second slots defined axially in the outside thereof. Each first slot receives a pin therein, and each second slot receives a roller therein. A rod extends through a dust-proof unit, a first ring and a spring. The lower section of the rod is connected to the top end of the inner part. An outer part is a tube which includes multiple first grooves and second grooves defined axially in the inner periphery thereof. The outer part is mounted to the inner part. The pins are partially accommodated in the first grooves, and the rollers are partially accommodated in the second grooves. The outer part is axially movable relative to the inner part by the pins and the rollers with less friction.

The present invention provides a semi-active vibration absorption and energy dissipation control system for restraining vortex-induced vibration of bridges. It has the advantages and characteristics that: (1) springs are horizontally placed at the bottom of a beam, and lengths are not limited, so that the frequency requirement of a low-frequency target can be satisfied; (2) different target frequencies can be realized through different combinations of a plurality of springs connected in series and in parallel, so that multi-order vortex-induced vibration control needs are satisfied; (3) the springs made of fiber reinforced nylon materials are adopted, and are notched, so that a frequency implementation range can be greatly widened; (4) the material and the form of a mass body are not limited, and a water bag can be used, which has low cost and is convenient for disassembly, assembly and mass adjustment.

The present invention provides a semi-active vibration absorption and energy dissipation control system for restraining vortex-induced vibration of bridges. It has the advantages and characteristics that: (1) springs are horizontally placed at the bottom of a beam, and lengths are not limited, so that the frequency requirement of a low-frequency target can be satisfied; (2) different target frequencies can be realized through different combinations of a plurality of springs connected in series and in parallel, so that multi-order vortex-induced vibration control needs are satisfied; (3) the springs made of fiber reinforced nylon materials are adopted, and are notched, so that a frequency implementation range can be greatly widened; (4) the material and the form of a mass body are not limited, and a water bag can be used, which has low cost and is convenient for disassembly, assembly and mass adjustment.

A negative stiffness generating mechanism and a quasi-zero stiffness vibration isolator are provided. A housing is mounted on a base, and the axial relative positions of the housing and the base can be adjusted; a negative stiffness unit comprises inner-ring magnets, outer-ring magnets and a supporting shaft, the supporting shaft axially slides on the base and passes through the housing, the inner-ring magnets fixedly sleeve the supporting shaft, and the outer-ring magnets sleeve outside the inner-ring magnets and are divided into upper and lower groups of outer-ring magnets; the upper and lower groups of outer-ring magnets can synchronously move through a negative stiffness adjusting device; and the axial relative positions of the middle planes of the outer-ring and inner-ring magnets can be adjusted by adjusting the axial relative positions of the housing and the base. The isolator comprises a negative stiffness generating mechanism and a positive stiffness unit.

A suspension component (730), including: an elastomeric component top member (832); an elastomeric component bottom member (830); and a plurality of elastomeric zig-zag columnar elements (800). The elastomeric zig-zag columnar elements connect the elastomeric component top member to the elastomeric component bottom member and are separated from each other by a gap (806).

A display apparatus includes a base, a stand, a head having a display and pivotable between a landscape mode and a portrait mode, a penetration groove, an inner bracket disposed inside the head and having a slit formed therein to face the penetration groove, a shaft including a first extension connected to the stand and extending to an inside of the head through the penetration groove and a second extension extending from an end of the first extension to pass through the slit, a long hole formed in the second extension and extending in a longitudinal direction of the second extension, a guide pin fixed to an inside of the head to pass through the long hole, a slider sliding along the second extension, and a spring disposed on an outer circumference of the second extension and configured to pressurize the slider to maintain contact between the slider and the inner bracket.