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Adjustable apparatus for forming voids in concrete

  • US 5,156,755 A
  • Filed: 03/11/1991
  • Issued: 10/20/1992
  • Est. Priority Date: 07/27/1989
  • Status: Expired due to Fees
First Claim
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1. An apparatus for forming a void through hardenable material in contact with a wood form member, said apparatus comprising a baseplate, fastener screws mounting the baseplate on the form member, a pair of telescopic sleeves with a lower sleeve being mounted on the baseplate and an upper sleeve mounted in telescopic relation to the lower sleeve, means interconnecting the sleeves to enable vertical adjustment of the overall height of the sleeves to position an upper end of the upper sleeve substantially flush with an upper surface of the hardenable material, said means enabling vertical height adjustment of the telescopic sleeves including means to move the upper sleeve upwardly in relation to the lower sleeve after the hardenable material has hardened thereby extracting the upper sleeve from the hardened material and enabling the lower sleeve and baseplate to be pulled upwardly out of the void formed in the hardenable material by pulling the fastener screws out of the wood form member, said upper sleeve and lower sleeve being generally cylindrical in configuration with the upper sleeve telescoping over the lower sleeve, said means mounting the lower sleeve on the baseplate including a threaded connection between the baseplate and the lower sleeve, said means interconnecting the upper and lower sleeves including a tubular internally threaded member rigidly mounted on the lower sleeve and a threaded rod threadedly engaged in the tubular member, the threaded rod including a collar adjustably mounted thereon for engagement with the upper sleeve to move the upper sleeve upwardly in relation to the lower sleeve in one direction of rotation of the threaded rod.

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