| 摘要 |
This invention concerns a diving tower, adjustable in height and operated by means of a hydraulic ram assembly, said ram assembly being powered by pressurized fluid within annular chambers of compression which vary the height of the diving board. The said annular chambers of compression are formed by the space between two coaxial cylinders, or a plurality of coaxial cylinders, of different diameters, and thus, permit a reduction in the surface areas to which the hydraulic force is applied while at the same time permitting the selection of larger cylinder diameters as needed for rigid cylindrical lifting rams. Since the active surface areas are the top annular areas and not the cylinder areas, the size of the said cylinders may be increased in order to present a greater bending moment without requiring additional fluid to maintain a reasonable operating speed. A platform for the diving tower is attached to the lifting ram cylinder, and a fulcrum roller is supported by a sliding frame engaged on dovetail tracks, said dovetail tracks being fastened to said platform. Said sliding frame, in order to permit variations in the location of the fulcrum point of the diving board, is positioned by means of a standard hydraulic cylinder. A special ladder is attached to the platform and said ladder is composed of two uprights with removable, lift-out steps. Said steps are supported by the uprights without being permanently fixed and are free to slide and lift out of grooves made within said uprights in order to avoid accidental injuries or damage to the said ladder. A counterweight is located at the back end of said platform and reacts against the diver's downward push that would otherwise cause an excessive bending stress to the lifting rams. A protective cage is also added around the ladder, below ground level, and inside said cage a set of guide rollers or cushions is fixed to act as guides for the ladder uprights which may be moved up or down, and also to absorb a shock or force in any direction other than the one in which the lifting rams and the ladder have to move.
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