| 摘要 |
The invention includes a loop in the form of a tangentially flexible cylinder for use preferably in conjunction with pointing devices of the type where the loop can be moved by the user in its axial direction and rotate over two parallel supports that tighten the loop. The loop includes a tangentially flexible support material, suitably thin fabric, with a number of mutually spaced low friction strips parallel to the longitudinal axis of the loop means. The friction material is mainly in the area outside the low friction strips. Great tangential flexibility of the loop is achieved since only little or no friction material is in the area between the low friction strips, at the same time as friction material above the low friction strips can be made arbitrarily thick for the best frictional and wear characteristics. |
