| 摘要 |
A pair of transversely spaced upright angle units each have upper end portions and an upright wall panel provided with a lower end portion. Ceiling panels are pivoted to the respective upper end portions, and adjustable braces pivotally connect the angle units with one another and with a floor, and also pivotally connect the ceiling panels with the respective angle unit. Each angle unit has at least one rotatable element associated with it and with its braces, and the rotatable elements are turnable about respective horizontal axes and are connected with the braces so as, when turned, to displace the angle units toward or away from one another and also to raise or lower the ceiling panels, depending upon the direction of rotation of the rotatable elements, for respectively erecting and striking the form.
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