| 摘要 |
<p>1424303 Reciprocating pumps and motors INCA INKS Inc 31 Jan 1974 [1 Feb 1973] 04640/74 Heading F1A In a well pump drive comprising a beam 8 pivoted on a post 6 and connected at one end by a cable 11 to the pump and at the other end to a counterweight 14, rocking of the beam is effected by a double-acting hydraulic motor 16 comprising a piston 17 with equal diameter piston-rods extending through each end of the cylinder 18, either the cylinder being reciprocable, as shown, and pivotably connected to beam 8 with pistonrod 21 pivotally connected to base 5, or the piston being reciprocable, Fig. 5 (not shown), with the cylinder pivotally connected to the base. As shown, the unattached piston-rod 22 is guided with clearance by guides 26, 27. Working liquid is supplied from a pump 41 to the cylinder chambers via hoses 37, 40 under the control of a reversing valve 43 actuated by a rod 44 on beam 8. In Figs. 3 and 6 (not shown), the unattached piston-rod is guided by a spider with rollers running in a pipe fixed coaxially to the cylinder.</p> |
