| 摘要 |
A tire add-on traction apparatus includes a ring-shaped housing which includes a ring-shaped base wall which has a circular inner edge portion and a circular outer edge portion. A hoop-shaped inner wall is connected to the inner edge portion of the base wall, and a hoop-shaped outer wall is connected to the outer edge portion of the base wall. The inner wall includes a plurality of inner access apertures distributed circumferentially around the inner wall. The outer wall includes a plurality of outer access apertures distributed circumferentially around the outer wall. Each of the inner access apertures is in alignment with one of the outer access apertures. A plurality of traction elements are supported by the housing. Each traction element includes a tire-contacting portion and a radial adjustment portion which extends through one of the outer access apertures and one of the inner access apertures. Each of the radial adjustment portions includes an associated longitudinal axis and a plurality of transversely oriented teeth arrayed longitudinally adjacent to the associated longitudinal axis. A spiral screw assembly is supported by the housing and includes a ring-shaped screw base and a spiral screw element. Portions of the spiral screw element are meshed with the teeth on the radial adjustment portions. Retainers are connected to the housing for retaining the spiral screw assembly within the housing. A plurality of wrench connectors are connected to the screw base of the spiral screw assembly.
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