B - Operations – Transporting – 28 – B
Patent
B - Operations, Transporting
28
B
B28B 21/90 (2006.01) B28B 17/00 (2006.01) E02D 29/12 (2006.01)
Patent
CA 2387308
As a part of the manufacture of concrete prodcts, such as concrete pipe, manholes and the like, the joint rings applied during the casting process must 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.
Schmidgall Jon A.
Schmidgall Ronald D.
Stoller David
Finlayson & Singlehurst
Hawkeye Concrete Products Co.
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