Fire escape – ladder – or scaffold – Ladder – With hook or grab
Patent
1994-08-24
1996-12-03
Chin-Shue, Alvin C.
Fire escape, ladder, or scaffold
Ladder
With hook or grab
182116, 182163, E06C 536
Patent
active
055798675
ABSTRACT:
A safety ladder made special for attachment to a lubricator, or a vertically disposed pipe, which enables a person to safely scale the lubricator after it has been affixed to a well head. The improved safety ladder apparatus of this invention is externally attached to the lubricator in such a manner that a rigid triangular structure of great structural integrity results from the combination. The ladder forms the hypotenuse of the triangle and is attached at a comfortable downwardly sloped angle respective to the lubricator so that it is easy and safe to scale. The ladder has opposed side rails rigidly connected together by a plurality of spaced rungs, and an upper end opposed to a lower end. A seat or chair is attached to the upper end of the ladder and forms part of the ladder apparatus. There is an anchor device mounted at the top of the ladder that is in the form of a yoke. The yoke has a central part from which opposed legs extend into attached relationship respective to the seat at the top of the ladder. The yoke extends from the seat and is attached to the lubricator. A ladder standoff structure is attached between the lower end of the ladder and the lubricator to support the ladder lower end from the lubricator while stabilizing said lower end of said ladder such that the ladder is firmly attached at a downwardly sloped angle respective to the lubricator. Therefore the anchor yoke secures the upper end of the ladder closely adjacent to the lubricator while the standoff secures the lower end of the ladder spaced a relatively far distance from the lubricator and thereby presents a rigid structure of triangular configuration.
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Bates Marcus L.
Chin-Shue Alvin C.
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