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A swivel caster. A caster (or castor) is an undriven wheel that is designed to be attached to the bottom of a larger object (the "vehicle") to enable that object to be moved. Casters are used in numerous applications, including shopping carts, office chairs, toy wagons, hospital beds, and material handling equipment.
The top drive allows the drilling rig to drill the longer section of a stand of drill pipe in one operation. [1] A rotary table type rig can only drill 30-foot (9.1 m) (single drill pipe) sections of drill pipe whereas a top drive can drill 60–90-foot (18–27 m) stands (double and triple drill pipe respectively, a triple being three joints of drillpipe screwed together), depending on the ...
Scenery wagon. A scenery wagon, also known as a stage wagon, is a mobile platform that is used to support and transport movable, three-dimensional theatrical scenery on a theater stage. In most cases, the scenery is constructed on top of the wagon such that the wagon, and the scenery it supports, forms a single, integrated structure.
Rack and pinion. A rack and pinion is a type of linear actuator that comprises a circular gear (the pinion) engaging a linear gear (the rack). [1] Together, they convert between rotational motion and linear motion: rotating the pinion causes the rack to be driven in a line. Conversely, moving the rack linearly will cause the pinion to rotate.
A swivel gun (or simply swivel) [1] is a small cannon mounted on a swiveling stand or fork which allows a very wide arc of movement. Another type of firearm referred to as a swivel gun was an early flintlock combination gun with two barrels that rotated along their axes to allow the shooter to switch between either the rifled or the smoothbore ...
Constant-velocity joint. A constant-velocity joint (also called a CV joint and homokinetic joint) is a mechanical coupling which allows the shafts to rotate freely (without an appreciable increase in friction or backlash) and compensates for the angle between the two shafts, within a certain range, to maintain the same velocity.
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