zhongxinladder

    * Fixed ladder, Two side members joined by several rungs; affixed to structure with no moving parts
    * Extension ladder or Telescopic ladder, fixed ladder divided into two or more lengths for more convenient storage; the lengths can be slid together for storage or slid apart to maximize the length of the ladder; a pulley system may be fitted so that the ladder can be easily extended by an operator on the ground then locked in place using the dogs and pawls
    * Aluminum step ladder ,household step ladders hinged in the middle to form an inverted V, with stays to keep the two halves at a fixed angle

                                                             The size of the tray:260*225*25mm

    * Folding ladder, A ladder in the step ladder style with one or more (usually no more than three) one-way hinges. Ideal for use on uneven ground (i.e. stairs), as a trestle or when fully extended a Fixed ladder. Some variations feature a central one-way hinge with extensible locking legs
    * Platform steps, step ladder with small horizontal platform at the top
    * Orchard ladder, three legged step ladder with third leg made so that it can be inserted between tree branches for fruit picking
    * Roof ladder, rigid ladder with large hook at the top to grip the ridge of a pitched roof
    * Cat ladder (US chicken ladder), lightweight ladder frame used on steep roofs to prevents workers from sliding
    * Hook ladder or pompier ladder, rigid ladder with a hook at the top to grip a windowsill; used by firefighters
    * Turntable ladder, extension ladder fitted to rotating platform on top of a fire truck
    * Bridge ladder, ladder laid horizontally to act as passage between two points separated by a drop.
    * Vertically rising ladder, a ladder designed to climb high points and facilitate suspending there.

from:http://zhongxinladder.blogtownhall.com/