Patent ID: 8968623
Filing Date: 2015-03-03
Classification: B28B

Abstract:
1. A method for demolding a plurality of concrete blocks which are cast in a resilient mold supported in a rigid frame, the mold having a top surface and a plurality of cavities each with an opening at the top surface which cavities form and hold cured cast concrete blocks, the mold having first and second opposing edges extending along opposite sides of the mold, and wherein the demolded blocks are stacked on a collection surface, the method comprising the steps of: a) covering the open top of the mold cavities with a rigid support; b) inverting the mold, frame and support whereby the mold and cast block are positioned on the rigid support; c) providing demolding apparatus including a first gripping mechanism-spaced above the collection surface for clamping on the first mold edge and a second gripping mechanism spaced above the collection surface for clamping on the second mold edge and wherein the first gripping mechanism is pivotable about an axis parallel to the first mold edge and the second gripping mechanism is pivotable about an axis parallel to the second mold edge; d) positioning the support with the inverted mold in the demolding apparatus; e) clamping the first gripping mechanism onto the first mold edge and clamping the second gripping mechanism onto the second mold edge; and f) withdrawing the support from under the inverted mold whereby the mold is suspended from the gripping mechanisms engaging the first and second opposing mold edges and wherein the mold sags and stretches to facilitate release of the blocks from the mold whereby such released blocks fall onto the collection surface, and wherein as the mold sags and stretches, the gripping mechanisms pivot to minimize stress in the mold adjacent the opposing mold edges.