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US 4,203,714 AGranted
Apparatus for vacuum processing of concrete
AssigneeTremix AB
InventorHarald S. Wenander
Life of this patent
Estimating the term…
Abstract
This invention relates to apparatus for vacuum processing concrete for removing surplus water from the concrete by exposing the concrete to vacuum. According to the invention solid particles are prevented from being sucked away from the concrete by applying the vacuum to the concrete surface through a sheet perforated with a great number of holes. The holes are sized to substantially exceed the smallest particles to be prevented from being sucked away by filtering within the concrete.
Claims4
An apparatus for vacuum processing concrete to remove surplus water from a concrete surface comprising:
- an upper cover for sealingly defining a surface to be processed, a vacuum source, means for connecting said vacuum source to said cover, lower sheet means preventing solid particles from being sucked away from the concrete surface along with the water, and means forming passages between the upper cover and said lower sheet means for distribution of the vacuum from said vacuum source and transport of the water removed from the concrete, said lower sheet means having perforations comprising small holes the size of which substantially exceeds the smallest size of the particles of concrete.
Dependencies are inferred from the claim text.