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Werner Co. is a privately owned company involved with the manufacturing and distribution of aluminum and fiberglass ladders, light duty construction equipment, fall protection equipment, and similar products. Werner Co. is headquartered in Itasca, Illinois.
Rigid ladders were originally made of wood, but in the 20th century aluminium became more common because of its lighter weight. Ladders with fiberglass stiles are used for working on or near overhead electrical wires, because fiberglass is an electrical insulator. [5] Henry Quackenbush patented the extension ladder in 1867. [6]
Ladders on the outside allow for easy access to the roof for loading. The vessel must be designed to withstand the load of someone standing on these ladders, and even withstand a person standing on the roof. Sloped bottoms allow for easier draining. Level gauges allow someone to accurately read the liquid level in the tank. The vessel must be ...
Some of the first curtain walls were made with steel mullions, and the polished plate glass was attached to the mullions with asbestos- or fiberglass-modified glazing compound. Eventually silicone sealants or glazing tape were substituted for the glazing compound. Some designs included an outer cap to hold the glass in place and to protect the ...
The Combined Platform-Ladder (CPL) is a hydraulic ladder-platform truck which is used to conduct external firefighting and rescue operations involving high-rise buildings. There are several variants of CPL in SCDF, the largest being the CPL60 which can extend its platform ladder up to a maximum height of 60 metres, the equivalent of a 20-storey ...
Because masts, towers and the antennas mounted on them require maintenance, access to the whole of the structure is necessary. Small structures are typically accessed with a ladder. Larger structures, which tend to require more frequent maintenance, may have stairs and sometimes a lift, also called a service elevator.