Sheave

Definition and stakes

Hoisting Appliances (1906)

“ In the case of the sheave with wrought-iron arms, or spokes, Fig. 3, the load is transmitted around the rim to the side opposite its point of application and is carried from there to the hub and shaft by the tension of the spokes; in fact, from the method of construction, the spokes in this sheave act only by tension. The sheave is strong and rigid, and much lighter than [Pg 4] a cast-iron sheave of the same strength, so that there is less wear between it and the rope due to any slipping action when it is started or stopped.
Fig. 4
Fig.
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Source: Gutenberg

Hoisting Appliances (1906)

“ Koepe. A single grooved driving sheave a is used in place of a drum. The winding rope b passes from one cage A up over a head-sheave, thence around the sheave a and back over another head-sheave, and down to a second cage B; it encircles a little over half the periphery of the driving sheave and is driven by the friction between the sheave and rope. A balance rope c beneath the cages and passing around the sheave d gives an endless-rope arrangement with the cages fixed at the proper points. ”
Source: Gutenberg

David Allan Low,  An Introduction to Machine Drawing and Design

“ The two parts of the sheave are connected by two cotter bolts. The part which embraces the sheave is called the eccentric strap, and corresponds to, and is, in fact, a connecting rod end: the rod proceeding from this is called the eccentric rod.
The distance from the centre of the sheave to the centre of the shaft is called the radius or eccentricity of the eccentric. The throw is twice the eccentricity.
The sheave is generally made of cast iron.
”
Source: Gutenberg

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