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Bullwheel

Bullwheel

Overview
A bullwheel is a large wheel on which a rope
Rope
A rope is a length of fibers, twisted or braided together to improve strength for pulling and connecting. It has tensile strength but is too flexible to provide compressive strength...

 turns, such as in a chairlift
Chairlift
An elevated passenger ropeway, or chairlift, is a type of aerial lift, which consists of a continuously circulating steel cable loop strung between two end terminals and usually over intermediate towers, carrying a series of chairs...

. In that application, the bullwheel that is attached to the prime mover is called the drive bullwheel, with the other known as the return bullwheel.
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Encyclopedia
A bullwheel is a large wheel on which a rope
Rope
A rope is a length of fibers, twisted or braided together to improve strength for pulling and connecting. It has tensile strength but is too flexible to provide compressive strength...

 turns, such as in a chairlift
Chairlift
An elevated passenger ropeway, or chairlift, is a type of aerial lift, which consists of a continuously circulating steel cable loop strung between two end terminals and usually over intermediate towers, carrying a series of chairs...

. In that application, the bullwheel that is attached to the prime mover is called the drive bullwheel, with the other known as the return bullwheel.

Originally, bullwheel was an oil field
Oil field
An oil field is a region with an abundance of oil wells extracting petroleum from below ground. Because the oil reservoirs typically extend over a large area, possibly several hundred kilometres across, full exploitation entails multiple wells scattered across the area...

 term applied to the large wheel that turns the drum upon which the drilling line is wound in percussion drilling.