Coupling structure for piston used in fluid-pressure cylinder, and coupling method therefor
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United States of America Patent
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May 31, 2016
Grant Date -
Mar 13, 2014
app pub date -
May 21, 2012
filing date -
May 25, 2011
priority date (Note) -
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Abstract
A coupling structure for a piston used in a fluid-pressure cylinder. The piston in the fluid-pressure cylinder includes a piston hole that runs through a central part of the piston in an axial direction thereof. One end of a piston rod and a coupling body coupled to the one end are inserted into the piston hole. The coupling body includes: a main part that contacts the one end of the piston rod; and an angled part formed around the main part and inclined at a prescribed angle with respect thereto. When the coupling body is subjected to pressure inside the piston hole, the diameter of the coupling body increases and a pointed edge of the angled part engages with an inner surface of the piston hole such that the coupling body couples the piston and the piston rod.
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