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Most Rigid ladders may be portable. They can be removed after use and stored. They are made of light weight material. loft ladders Some ladders are permanently fixed to a building or a vessel. Rigid ladders are made of timber, fiberglass, metal tubes or tough plastics. There many types of rigid ladders including bridge, cat, extension, fixed, folding, hook, orchard, platform, roof, step, turntable and vertically rising.
A bridge ladder is used to pass over a narrow depression. It is placed in a horizontal position over the depression to enable people to pass over it. Cat ladder is used to work on a roof. Workers lay it on top of the roof to prevent sliding. Extension ladder is sometimes referred to as telescopic ladder. It is a form of composite ladder consisting of several ladders fixed together. The length of the ladder can be varied by moving the units over each other. When folded an extension ladder is convenient for storage. In us it can be extended to scale high heights. Some extension ladders have a pulley system which makes it possible to operate the extension on the ground. The units are locked together using dogs and pawls.
A fixed ladder consists of two ladders permanently connected at the top to form a triangular shape. A folding ladder consists of a series of ladders connected by hinges which enable them to be folded for storage.
Hook ladder sometimes referred to as pompier ladder. It has hooks on top. The hooks are used to secure the top to a windowsill on the upper floors. The ladder is used by fire fighters for scaling buildings to higher floors. Orchard ladder is used for fruit picking. It has 3 legs. The third leg is inserted between tree branches while picking fruits on higher branches. Step ladder has a hinge in the middle. It is used when folded to from an inverted V. The two halves are fixed at an angle using stays. Platform ladder is basically a step ladder but with a horizontal platform at the top. It is notable that a step ladder is able to support itself and does not have to be leaned on the wall.
Roof ladder is a form of hook ladder adapted for the roof. The hook is used to grip the ridge of a pitched roof. Turntable ladder is a form of extension ladder used by fire fighters. It is fixed to a rotating platform on top a fire engine truck. Vertically rising ladder is used for climbing high points. It is used to suspend the user while performing the job.
Aluminum tubes are the popular material for making ladders. Aluminum ladders are light and easy to carry. Fiberglass Ladders are used where electrical wires are close by because fibreglass is not a good conductor of electricity. Timber conducts electricity when wet and should be used in such situations. Assault ladders are used during wars. Soldiers used them to climb onto enemy vessels or buildings.
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