Abstract： ASME B30.21:2005 pdf download.Manually Lever Operated Hoists. chain, rollerkss: a series of alternately assembled roller links and pin links in which the pins articulate inside the bushings with rollers on the bushings omitted. Pins and bus...

ASME B30.21:2005 pdf download.Manually Lever Operated Hoists.

chain, rollerkss: a series of alternately assembled roller links and pin links in which the pins articulate inside the bushings

with rollers on the bushings omitted. Pins and bushings are press fit in their respective link plates.

chain, welded link: a chain consisting of a series of interwoven links formed and welded (see Fig. 5).

desiçna fed person: a person selected or assigned by the employer or the employer’s representative as being competent to perform

specific duties.

drum: the cylindrical member around which the wire rope or web strap is wound for lifting and lowering the load.

exposed: applies to hazardous objects not guarded or isolated (capable of being contacted inadvertently).

friction brake: see load controlling mechanism.

guide, chain: a means to guide the load chain at the load sprocket.

guide, web strap: a means to guide the web strap at the load sprocket (drum) (see Fig. 6).

guide, wire rope: a means to guide the wire rope at the load sprocket (drum) Isce Fig. 7, sketch (b)I.

hazardous (classified) locations: locations where fire or explosion hazards may exist. [.ocations are classified according to the

properties of the flammable vapors, liquids, gases, or combustible dust or fibers that may be present, and the likelihood that a

flammable or combustible concentration or quantity is present (see ANSI NFI’A 70).

headroom (closed height): the distance between the saddle of the suspension hook and the saddle of the load hook when the load

block is in its fully retracted position (upper limit of travel) (see Fig. 4).

hoist, lever operated: a lever operated manual device used to lift, lower, or pull a load and to apply or release tension.

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