the axis 46 passes through the bearing 56 for the end supports 50 and the hangers 54 defining a first axis of pivotal movement the hangers 54 are interconnected by motor platform 64 which platform 64 carries the motor 62 and a pair of suspended end supports 52 mounted to the platform 64 intermediate the hangars 54 the end supports 52 hangars 54 and platform 64 form a movable base of the support assembly 16 the end supports 52 have bearings 58 for pivotally mounting a coupling 170 providing pivotal movement about the second axis 48 as seen in fig1 the coupling 170 connects the suspended end support 52 to an axle 168 connected to the sleeve 29 of the housing assembly 14 the axle 168 is aligned with the axis 48 defining a second axis of pivotal movement for the housing assembly 14 the motor 60 is connected through drive linkage 84 to the hangers 54 fig1 to pivot the movable base about the first axis 46 the linkage 84 includes a drive link 88 fixedly connected to the motor 60 and pivotally connected to link 90 the link 90 is pivotally connected to one end of connecting link 92 the other end of connecting the link 92 is fixedly connected to one of the hangers 54 fig1 through a stub axle at the bearing 56 rotational motion of the drive crank 80 imparted by the motor 60 will cycle the movable base through an arc substantially as seen in fig3 in a like manner the motor 62 is mounted to the platform 64 which platform 64 is connected to both the hangers 54 and.