EXTENSIBLE LOCKING SYSTEMS FOR FORMWORK FOR THE CASTING OF CONCRETE CONSTRUCTIONS

摘要

The present invention relates to apparatus for casting concrete structures having a varying cross-section and includes a plurality of interconnected units. Each of the units includes at least two rods of equal length which are pivotally interconnected to one another at their mid points, the ends of adjacent units being pivotally connected at an angle to one another such that upon pivoting of the two rods of each of the units, the ends are all moved in parallel relationship to one another. A rigid yoke carries the framework and includes a pair of legs, each of the units being pivotally connected to a stationary point on one yoke leg and pivotally connected to a member movable along a yoke leg.