Metal coil propeller shaft seal for watercrafts including deep dive vessels
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United States of America Patent
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Apr 8, 2014
Grant Date -
Nov 14, 2013
app pub date -
Oct 11, 2012
filing date -
May 14, 2012
priority date (Note) -
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Abstract
A propeller shaft seal for sealing a propeller shaft in a stern tube, comprising a bi-direction rotational sealing body being fitted within the stern tube and wrapped around the propeller shaft in its axial direction; wherein the bi-direction rotational sealing body comprising two metallic helical coils stacking together in a way that is mirroring each other; wherein the first and second metallic helical coils being constructed from helically coiled metal tapes of varying widths linked together and coiled into rings and with the rings tightly bounded; and wherein at any one time during operation, a rotational direction of the propeller shaft is same as coiling direction of one of the two metallic helical coils but opposite to that of the other of the two metallic helical coils.
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