Abstract: A forward and backward slidable saddle assembly includes a bottom board adapted to be mounted on a carrier of a bike; a slidable plate slidably mounted on the bottom board, formed with a pair of parallel channels spaced from each other by a distance in a front-rear extension direction; a securing assembly including a plurality of screw rods and a plurality of fixing pins; and a saddle body mounted on the slidable plate. When the saddle body is moved in the front-rear extension direction, the slidable plate is constrained by the securing assembly from detaching from the bottom board in an upward/downward direction while allowing the pair of parallel channels of the slidable plate to move relative to the plurality of fixing pins in the front-rear extension direction to have the slidable plate together with the saddle body moving relative to the bottom board in the front-rear extension direction.

Abstract: A three-dimensional bicycle saddle structure includes a saddle body mounted on a support frame. The saddle body includes a plurality of vertical ribs, which are spaced from each other by a spacing distance and are arranged on a base layer in an arrangement direction. Each of the plurality of vertical ribs has a bottom on and extending upward from the base layer in an upward extension direction to a height. The tops of the plurality of vertical ribs jointly form a pressure supporting surface for the saddle body. When the tops of the plurality of vertical ribs receive an action force acting thereon, the plurality of vertical ribs, in response to the action force, individually generate adaptive inclined deformations of different degrees.

Abstract: A rolling line for long products having a starting nominal transverse dimension between 120 and 180 mm and a final nominal transverse dimension between 4 and 25 mm. The rolling line comprises at least one roughing assembly, an optional reduction and sizing assembly, a fast pre-finishing assembly, and a fast finishing assembly. The optional reduction and sizing assembly having three rolling passes for finishing the long products when their final nominal transverse dimension is in a range between 20 mm and 25 mm. The fast pre-finishing assembly having a plurality of rolling passes, wherein the products are subjected to a same reduction sequence up to the last rolling pass of the plurality of rolling passes. The fast finishing assembly is provided for finishing the long products when their final nominal transverse dimension is lower than 20 mm and has four rolling passes comprised as two separate modules, each having two rolling passes.