Abstract: A mainframe for a float structure is described. The mainframe is detachably connectable to the dorsal surface of the float structure inflatables and comprises: a plurality of segmented and connectable cross-structure support members transversely attached to a plurality of segmented and connected longitudinal connector members via a connector member. Each of the longitudinal members and crossmembers may be made up of a plurality of detachable sections.

Abstract: A mainframe for a float structure is described. The mainframe is detachably connectable to the dorsal surface of the float structure inflatables and comprises: a plurality of segmented and connectable cross-structure support members transversely attached to a plurality of segmented and connected longitudinal connector members via a connector member. Each of the longitudinal members and crossmembers may be made up of a plurality of detachable sections.

Abstract: A switch assembly which has a pair of electrically non-conductive sheets which are maintained spaced from each other by a suitable spacer structure. One sheet is formed with an opening passing therethrough and the spacer structure is clear of this opening so that the sheets have inner surface regions directed toward each other with one of these surface regions surrounding the opening and the other surface region being directed toward the opening. A switch-operating structure is freely movable through this opening and is electrically conductive. This switch-operating structure has between the sheets an inner enlarged electrically conductive head end which has a thickness less than the space between the sheets so that this inner head end is movable between the inner surface regions of the sheets. The switch-operating structure has an outer enlarged electrically conductive head end situated at the exterior of the sheet which is formed with the opening, at the side of the latter opposite from the other sheet.