| 摘要 |
<p>1536673 Valves LUCAS INDUSTRIES Ltd 20 Feb 1976 [7 March 1975] 9512/75 Heading F2U A valve has control elements 17, 18 between paired inlets and outlets 11, 13 and 12, 14, with a linkage element 24 interconnecting the control elements and pivotally connected to a part 23 which is movable in response to a signal, there being provided electrically operable locking means at the pivot. As shown the locking means consists of a chamber 27 in the lever 24 filled with electro-viscous liquid (e.g. porous silicon kerosene the viscosity of which is increased by a high tension voltage). A projection 28 into the chamber is thus positively located when high voltage is applied between the lever 24 and a stem 23. The stem is movable by a piston 21 under pressure from a source P through an electro-hydraulic valve 31. By arranging for sequential operation of switches 29, 31 the valves 17, 18 are operable entirely in unison. An alternative method of voltage application is described, Fig. 4 (not shown), and the use of ferro-hydrodynamic liquid is described with reference to Figs. 5 and 6 (not shown). Alternative pivot and locking arrangements are described with reference to Figs. 7 and 8 (not shown) in which electromagnetic locks are provided combined with a further degree of pivotal freedom.</p> |
