| 摘要 |
The movable device for duplicating the run of the pistons' stems, in particular of the hydraulic, fluidodynamic and oleodynamic pistons, consists of a bush (F) appropriately guided and axially sliding on a vertical, straight stem (B), with reciprocal possibility of longitudinal motion, said bush (F) being pulled by a rope (H) or chain connected on one side to the rod or stem and on the other side returned to a fix head (D) by means of a pulley or cogged wheel (G), so that said bush (F) always remains placed at the centre of said stem (B) that gives said bush the pulling rising force, while when the stem (B) develops the descending motion said bush also descends due to the force of gravity.
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