Apparatus and method for removing joint rings from cured concrete products
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United States of America Patent
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Nov 16, 2004
Grant Date -
Aug 21, 2003
app pub date -
Feb 19, 2002
filing date -
Feb 19, 2002
priority date (Note) -
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Abstract
As a part of the manufacture of concrete products, such as concrete pipe, manholes and the like, the joint rings applied during the casting process much be removed. The invention relates to a joint ring removal system in which a vertically oriented concrete product, containing a joint ring, is gripped to hold the product stationary while a joint ring pulling force is applied. Then, a shocking force is applied laterally to the joint ring to free it from the concrete joint. The amount of pulling force applied to the joint ring is less than that required to separate the joint ring from the concrete while the shocking force is applied in a direction transverse to the pulling force so that no harmful tensile shocking forces are transmitted to the concrete joint. The pulling force on the joint ring is variably applied and timed with the shocking force.
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