Core Lifter Assembly
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United States of America Patent
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Issued Date -
Sep 3, 2015
app pub date -
Sep 24, 2013
filing date -
Sep 25, 2012
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Abstract
A core lifter assembly includes a combination of a core lifter ring and a core lifter case. The ring has an axially extending portion of an outer generally frusto-conical configuration having an included taper angle β. The included taper angle β is also the taper angle of the outer circumferential surface of the ring. The included taper angle β may in alternate embodiments be ≧6°; ≧7°; ≧8°; or ≧10°. In one embodiment an upper limit of the included taper angle β may be about 30°. Thus in one embodiment the included taper angle β may be expressed by the relationship: 30°≧β≧6°. Further, the angle β may comprise any sub range within the aforementioned range of 6-30°. However in other embodiments the taper angle may exceed 30°.
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