A linear actuator comprising a housing with first and second ends, and defining a central cavity extending axially therethrough; a tube having first and second portions, the first portion arranged to slide within the central cavity of the housing, and the second portion extending outwardly from the second end of the housing; a first elongated rotatable screw positioned axially within the central cavity and coaxial with the rube; a first nut mounted about the first elongated rotatable screw and configured to move axially as the first elongated rotatable screw rotates; a second elongated rotatable screw positioned axially within the central cavity; a second nut mounted about the second elongated rotatable screw and configured to move axially within the central cavity as the second elongated rotatable screw rotates; and a spring positioned around the second elongated rotatable screw between the second nut and the second end of the housing.

A combined air spring system includes an upper cover plate, an air bag, an upper end plate and a lower end plate. An outer periphery of the upper cover plate is connected with an outer periphery of the upper end plate through the air bag. A low-position sand clock elastomer is connected between the upper end plate and the lower end plate. A pressing plate is installed at a bottom portion of the upper cover plate, and a high-position elastomer is connected between the upper cover plate and the pressing plate. A limiting table is arranged at a bottom portion of the pressing plate. A limiting groove is formed in a top face of the upper end plate. The limiting table is located in the limiting groove in a deflated state.

An emergency air spring assembly includes an upper cover plate, an air bag, an upper end plate and a lower end plate. An outer periphery of the upper end plate is connected with an outer periphery of the lower end plate through the air bag. An hourglass elastomer is connected between the upper cover plate and the upper end plate. A plurality of steel springs are arranged between the upper cover plate and the upper end plate in a circumferential direction of the sand clock elastomer in a pressing mode.

An hourglass type air spring assembly includes an upper cover plate, an air bag, an upper end plate and a lower end plate. An outer periphery of the upper cover plate is connected with an outer periphery of the upper end plate through the air bag. A low-position hourglass elastomer and a high-position elastomer which are integrally formed are connected with each other between the upper end plate and the lower end plate. An annular notch is formed between the low-position hourglass elastomer and the high-position elastomer, and an annular rigid partition plate matched with the annular notch is arranged in the annular notch.

A control structure device for racks or buildings. The device is able to limit forces developed within itself or a structure (e.g. building or storage rack) it connects with and is seismically supportive of as it endures ground or base motion input from a seismic event. The control structure may comprise a relatively inflexible rocker frame which is pivotably connected to a foundation. Rotation of the rocker frame causes a flexural member to flexurally displace to limit force and energy in the system.

A control structure device for racks or buildings. The device is able to limit forces developed within itself or a structure (e.g. building or storage rack) it connects with and is seismically supportive of as it endures ground or base motion input from a seismic event. The control structure may comprise a relatively inflexible rocker frame which is pivotably connected to a foundation. Rotation of the rocker frame causes a flexural member to flexurally displace to limit force and energy in the system.

A shock absorber for a washing machine and a washing machine having the same are disclosed. The shock absorber includes: a shock absorber sleeve, and the shock absorber sleeve defines an accommodation cavity therein; a shock absorber rod, movably connected to the shock absorber sleeve; an elastic member provided on the shock absorber rod and/or the shock absorber sleeve; a first damping member fitted over the shock absorber rod and mounted on the shock absorber sleeve; and a second damping member mounted on the shock absorber rod and accommodated in the accommodation cavity. The first damping member and the second damping member generate damping when the shock absorber rod moves relative to the shock absorber sleeve. The shock absorber for the washing machine has a simple structure and favorable shock absorbing effects, and occupies little space.

A spring apparatus (10), including: a spring (12); an elongated object (18A) disposed within and along the spring (12); and a mode-changing assembly (16), for providing a first mode in which a portion (38) of the spring (12) being along the elongated object (18A) is not springy, and a second mode in which an entire of the spring (12) is springy.

A force transfer system includes a body and an article. The article includes a first portion forming a first lateral axis and a second portion forming a second lateral axis, the axes being offset. An intermediate member is disposed between the first portion and the second portion, and holds the second portion to the first portion. A stimulus received by the first portion causes a temporary alteration of the intermediate member from an initial condition, the alteration of the intermediate member thereby causing a change in a characteristic of the second portion. The intermediate member subsequently returns to the initial condition, thereby causing a change in a characteristic of the first portion, which is influenced by the change in the characteristic of the second portion. The change in the characteristic of the first and second portions prevents at least a portion of the stimulus from reaching the body.

A force transfer system includes a body and an article. The article includes a first portion forming a first lateral axis and a second portion forming a second lateral axis, the axes being offset. An intermediate member is disposed between the first portion and the second portion, and holds the second portion to the first portion. A stimulus received by the first portion causes a temporary alteration of the intermediate member from an initial condition, the alteration of the intermediate member thereby causing a change in a characteristic of the second portion. The intermediate member subsequently returns to the initial condition, thereby causing a change in a characteristic of the first portion, which is influenced by the change in the characteristic of the second portion. The change in the characteristic of the first and second portions prevents at least a portion of the stimulus from reaching the body.