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The chair's hidden base features a steel ball-bearing mechanism for a smooth, 360-degree swivel and the standard 22-inch seat depth can be extended to an extra-deep 27 inches, if you choose the ...
U.S. Patent No 8771 drawing image Patent 8771 image close-up of parts Shaker ladder chair with ball swivels on rear legs for tilting. The Shaker tilting chair – named for its ball bearing or ball and socket [A] button mechanism assembled to the back two legs of a wooden chair – allowed a person to lean back in the chair without slipping or scraping the floor.
A Kingpinless caster has an inner raceway, an outer raceway which is attached to the vehicle, and ball bearings between the raceways. This mechanism has no kingpin, hence the name kingpinless. The absence of a kingpin eliminates most causes of swivel caster failure [citation needed] and reduces or eliminates shimmy after use [clarify].
Working principle for a ball bearing; red dots show direction of rotation. A four-point angular-contact ball bearing. A ball bearing is a type of rolling-element bearing that uses balls to maintain the separation between the bearing races. The purpose of a ball bearing is to reduce rotational friction and support radial and axial loads. It ...
A ball bearing. A bearing is a machine element that constrains relative motion to only the desired motion and reduces friction between moving parts.The design of the bearing may, for example, provide for free linear movement of the moving part or for free rotation around a fixed axis; or, it may prevent a motion by controlling the vectors of normal forces that bear on the moving parts.
Slew ring bearing. A slewing bearing or slew[ing] ring (also called a turntable bearing) is a rotational rolling-element bearing that typically supports a heavy but slow-turning or slowly-oscillating loads in combination (axial, radial and moment loads), often a horizontal platform such as a conventional crane, a swing yarder, or the wind-facing platform of a horizontal-axis (yaw) windmill.