Importance

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Abstract

A bi-, tri-, or quadripod apparatus utilized over a confined space to aid in the introduction or removal of persons or equipment into the space, including a head casting with upright members extending vertically downwards and outwardly from the head casting. An anchor plate is centered and affixed in each of the respective exterior surfaces of the head casting, and the anchor plates have apertures in or about their lower portions for the attachment of support and/or hauling devices. Installation of a pulley sheave in each of both ends of one of the upright members improves bi-, tri-, and quadripod performance and makes it possible to provide an additional anchor or lift point in the proximal pulley; to eliminate the need to attach extra pulleys at attachment points for operation of a leg (upright member) mounted winch; to provide increased mechanical advantage of up to 2:1 with the addition of one additional pulley; to provide a distal end pulley, which allows remote pulling forces to be directed at the stable bottom of the apparatus rather than the less stable top; and to produce compressive forces on the leg structure during use, rather than lateral loading, thus increasing the load bearing capacity of the apparatus.

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First Claim