| 摘要 |
<p>A positioning means (38) characterised by two cylinders (46,60) in fluid communication each having a single member (48,62) extending therethrough dividing each cylinder into first and second compartments, each member (48,62) being moveable within its cylinder, the first compartment of one cylinder being in fluid communication with the second compartment of the other cylinder and the second compartment of the first cylinder being in fluid communication with the first compartment of the other cylinder whereby movement of the member relative to the cylinder through which it passes produces a consequent movement in the member of the other cylinder, the upper end of the member of one cylinder being mounted on a bogey (76) of a rail vehicle (58) and its lower end having provided thereon a delivery means for application of lubricant to a rail gauge face of a rail head (40). <IMAGE></p> |
