| 摘要 |
A brush has a slidable collar that effectively shortens the bristles to a desired plurality of lengths. The collar preferably slides with respect to a support in a manner that effectively locks the collar in predetermined positions. The locking mechanism can be purely frictional, but preferably also used a detent, or any other suitable device that provides discrete stops. Such stops are preferably no more than 2 cm apart, and can advantageously be spaced no more than 1 cm apart. Contemplated devices can have 2, 3, 4, 5, or more stops. Collared brushes can advantageously be marketed specifically with respect to the slidable collar feature, and more specifically with respect to the applicability of such brushes to automotive use.
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