| 摘要 |
A wrist supporting chassis is mounted on independent swiveling rollers for carrying the wrist of a user of a pointing device such as a computer mouse on a desktop or other surface. The swiveling rollers are carried on swivel arms in recesses on an underside of the chassis, arranged to rotate freely on a vertical axis, perpendicular to the desktop or surface. The swivel arms define a radius from the swivel axis to a roller carried on an axle parallel to the desktop and perpendicular to both the radius and the swivel axis. The swivel arm is mounted to the chassis by a hub that fits into a collar with an intervening bushing or ball bearing. In exemplary embodiments, the swivel arm can be a disc with a central hub, the roller axle being heat-pressed into the disc to occupy a radial slot at the outer edge of the disc. Alternatively, a spring biased arrangement for the roller axle can be provided on facing channels the define a range of roller displacement.
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