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Apparatus for moulding hydraulic cement or the like material

  • US 4,059,376 A
  • Filed: 02/28/1977
  • Issued: 11/22/1977
  • Est. Priority Date: 11/24/1973
  • Status: Expired due to Term
First Claim
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1. An apparatus for moulding a hydraulic substance comprising an injection tank, a moulding tank, and an overflow zone, said moulding tank being adapted to contain an aggregate, means for reducing the pressure in the moulding tank and in the overflow zone to a vacuum, means for introducing a cement and water mixture into the injection tank, means for transferring said mixture from the injection tank into the moulding tank in sufficient excess quantity to cause said mixture to overflow from the moulding tank into the overflow zone, and means for returning the overflow zone to at least atmospheric pressure, whereby at least a portion of said excess quantity of said mixture in the overflow zone is returned to the moulding tank to eliminate the voids between the aggregate in the moulding tank created by removing the excess water and entrained air under reduced pressure, and replacing said voids with said cement and water mixture to produce a substantially void-free product, said mixture being maintained in sufficient quantity in said overflow zone to avoid the introduction of air into the moulding tank.

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