| 摘要 |
852,577. Roundabouts. CHEREAU, A. Feb. 14, 1957, No. 5118/57. Class 132(1): A roundabout comprises a plate carrying a central structure on which plurality of telescoping arms each having at its outer end a passenger carrying for rotating the plate. As shown consisting of elements 13a, 13b is upright 54, and is raised and lowered by a jack 17. A jack 61 rigid with one of the elements 13a or 13b, has a piston rod 62 secured to the other element. Jacks 17 and 61 are preferably operated together and preferably they retract and expand simultaneously when operated by a lever in the car 14 which either acts on the distributer of the fluid pressure system or on one or more electrically operated valves controlling it. Specification 771,394 is referred to. |
