| 摘要 |
A plurality of teeth are individually rotatable on a shaft via integral hubs which are slidably mounted on and rotatable relative to the shaft. A bar is held parallel to the shaft by rigid connecting members between them, and respective biasing springs are connected to the bar and to respective fingers that are integral with the hubs. The shaft is rotatable in spaced brackets which are welded to the bottom of a slotted plate that is removably anchored in the top of a housing or frame that is adapted for embedment in a street surface or parking lot surface. The shaft is keyed to gear mechanism supported by the surface plate, the gearing being such as to permit the shaft to remain in a selected angular position. In one position of the shaft, all teeth protrude through slots to extend above the surface plate, and in another position all teeth are retained within the slots below the top surface of the plate. Selective positioning is effected via manual or motorized operations of the gear mechanism, and arrangements are shown for addition selective positioning of a parking gate and associated magnetic card readers in conjunction with shaft positioning.
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