| 摘要 |
A resilient rotational bias device that is continuously adjustable to supply any preselected rotational bias force to a shaft, within a wide range, by rotation of a multi-step shaft retention member, usually a gear, by a simple drive such as a worm gear that engages the shaft retention member; the shaft retention member an the drive are mounted in a housing that is affixed to one end of a resilient torsion member, the other end of the torsion member being affixed to a stationary frame. All elements of the device other than the torsion member, but including a connector for connecting the shaft retention member to the end of a biased shaft, are mounted in the housing. All elements of the device, except a drive shaft for th worm gear, are usually formed of the same molding resin, preferably polyurethane.
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