GB1346654A - - Google Patents

Abstract

1346654 Mobile luffing booms SIMON ENG DUDLEY Ltd 28 June 1972 [3 July 1971] 31279/71 Heading B8H [Also in Division E1] Articulatedly connected booms 11, 13, 14 are mounted on the rotatable turntable 12 of a vehicle 10, a working platform 15 being pivotally connected at 19 to the boom 14, the part of the platform 15 which lies to the left of the line AA in Fig. 3, being pivotable into a collapsed condition when the boom 14 is in its inoperative vertical position, Fig. 4 (not shown), whereby the overall dimensions of the platform 15 are reduced in said position. The first part of the platform 15 on the right of the line AA is a rigid structure comprising a base 17 and rear and side walls comprised by railings 18, while the second foldable part of the platform (on the left of the line AA) consists of a base 24 pivotally connected at an axis 24 to the base 17, and front and side walls of railing-like construction, the horizontal rails of the side walls being pivotally connected to the vertical rails of the front walls and to the adjacent wall parts of the first part of the platform. When the booms are folded into a nesting condition on the vehicle 10 the boom 14 depends from the boom 13 and the second cage part is folded upwardly by engagement with levers 20 which extend from brackets 22 on the boom 13 to a point at or adjacent the axis 21, the base 17 remaining horizontal throughout all movements of the booms.