Embodiments of safety trucks incorporate multiple connection points to which a variety of attachments, or combinations of attachments, can be releasably and interchangeably coupled to enable their use with increased effectiveness to safeguard roadway construction, maintenance and repair personnel as they perform tasks within or relatively near to roadway workzones and worksites. Also, methods of operation of the safety truck embodiments enhance their ability to guard and protect roadway construction, maintenance and repair personnel while they work within or relatively near to roadway workzone and worksite locations.

A pull down refrigerator shelf for a storage compartment of a refrigerator, the pull down refrigerator shelf may include a rear shelf plate; a front shelf plate disposed in front of the rear shelf plate and configured to be selectively positioned on a same plane as the rear shelf plate or below the rear shelf plate; and a shelf sliding and lowering mechanism disposed under the rear shelf plate and the front shelf plate and configured to allow the rear shelf plate and the front shelf plate to slide integrally, the shelf sliding and lowering mechanism configured to allow the front shelf plate to lower relative to the rear shelf plate while maintaining a horizontal state.

A damper for energy dissipation, including a core plate, at least four restrain plates and at least four connecting plates. The connecting plates are provided on two ends of the core plate, and the restrain plates are provided on middle of the core plate. The core plate is provided with a first hole, a second hole and a third hole. The connecting plate includes a first plate body and a second plate body connected with an end thereof. A first fastener passes through the first hole to connect the first plate body with the core plate. A second fastener passes through the second hole to connect the second plate body with the core plate. A third fastener passes through the third hole to connect the restrain plate with the core plate. The second plate body is located between two restrain plates.

A damper for energy dissipation, including a core plate, at least four restrain plates and at least four connecting plates. The connecting plates are provided on two ends of the core plate, and the restrain plates are provided on middle of the core plate. The core plate is provided with a first hole, a second hole and a third hole. The connecting plate includes a first plate body and a second plate body connected with an end thereof. A first fastener passes through the first hole to connect the first plate body with the core plate. A second fastener passes through the second hole to connect the second plate body with the core plate. A third fastener passes through the third hole to connect the restrain plate with the core plate. The second plate body is located between two restrain plates.

A robotic press assembly configured to apply force to a wheel, may include a selectively moveable arm that is operatively connected to a body portion at a first end thereof; and a press tool operatively connected to a second end of the moveable arm; wherein the press tool includes at least one mounting bracket maintaining a press tool thereon, the mounting bracket arranged on a platform, and a base operatively connected to the second end of the arm, the platform being slidably fixed to the base in order to adjust the lateral displacement of the press tool, and wherein the press tool is configured to apply force at the wheel.

A bumper spring assembly having a one piece mandrel including an integral head piece is further configured with a cage assembly retained on the mandrel with a cage nut locked to the mandrel to obviate the need for pins, set screws, and the like, to provide a more robust assembly. In two embodiments the cage nut is locked to the mandrel in a swaging operation. Improved flow of fluids through and around the bumper spring assembly are also provided

A bumper spring assembly having a one piece mandrel including an integral head piece is further configured with a cage assembly retained on the mandrel with a cage nut locked to the mandrel to obviate the need for pins, set screws, and the like, to provide a more robust assembly. In two embodiments the cage nut is locked to the mandrel in a swaging operation. Improved flow of fluids through and around the bumper spring assembly are also provided

A shock wave attenuating material (100) includes a substrate layer (104). A plurality (110) of shock attenuating layers is disposed on the substrate layer (104). Each of the plurality (110) of shock attenuating layers includes a gradient nanoparticle layer (114) including a plurality of nanoparticles (120) of different diameters that are arranged in a gradient from smallest diameter to largest diameter and a graphitic layer (118) disposed adjacent to the gradient nanoparticle layer. The graphitic layer (118) includes a plurality of carbon allotrope members (128) suspended in a matrix (124).

A shock wave attenuating material (100) includes a substrate layer (104). A plurality (110) of shock attenuating layers is disposed on the substrate layer (104). Each of the plurality (110) of shock attenuating layers includes a gradient nanoparticle layer (114) including a plurality of nanoparticles (120) of different diameters that are arranged in a gradient from smallest diameter to largest diameter and a graphitic layer (118) disposed adjacent to the gradient nanoparticle layer. The graphitic layer (118) includes a plurality of carbon allotrope members (128) suspended in a matrix (124).

A method for stabilizing transversal oscillations of a rotor including the steps of acquiring a first signal representing a value of transversal oscillations of a rotor; estimating a value of a thermal gradient from the first signal; computing a value of an actuation parameter from the value of thermal gradient; emitting an actuation signal representing the value of the actuation parameter.