| 摘要 |
An apparatus for automatically slip forming concrete having a movable frame for moving in a first direction over concrete to be formed into a desired shape. The movable frame has a longitudinal centerline generally aligned with or parallel to the first direction. A crown forming structure is attached to the frame for selectively producing a desired crown on the concrete being so formed. The crown forming structure includes a left segment pivotally attached on an inner portion thereof, along an axis generally near to and aligned with or parallel to the longitudinal centerline of the movable frame. The crown forming structure also includes a right segment pivotally attached on an inner portion thereof, along an axis generally near to and aligned with or parallel to the longitudinal centerline of the movable frame. A transition adjusting device is provided for selectively raising and lowering said inner ends of the right and left segments for controlling the crown forming structure. A computer control is also provided for automatically adjusting the position of the transition adjusting device for causing a smooth transition between two crown heights at two respective positions of the movable frame as the movable frame moves in the first direction thereof.
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