Pipe coupling having valve element and coil spring for use therein
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United States of America Patent
Stats
-
Dec 20, 2022
Grant Date -
Nov 25, 2021
app pub date -
Aug 4, 2021
filing date -
Feb 4, 2019
priority date (Note) -
In Force
status (Latency Note)
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Abstract
A coil spring is disposed in a fluid passage between a cylindrical body and a valve element to urge the valve element toward a closed position. The coil spring comprises a valve support portion supporting the valve element, a secured portion secured to an inner peripheral surface of the fluid passage, an expanding-contracting portion extending from the secured portion, and a connecting portion between the expanding-contracting portion and the valve support portion. The connecting portion comprises a first portion curved so as to pass radially outward of an end winding portion of the expanding-contracting portion, a second portion passing through the center of the valve support portion, a third portion extending curvedly so as to overlap the first portion, and a fourth portion extending to the valve support portion. When the coil spring is compressed, the valve support portion is supported to the expanding-contracting portion 54 through the connecting portion.
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