Fluid coupling device

Claim 1

Fluid coupling apparatus which is particularly adapted for the detachable connection of fluid pressure responsive equipment to a fluid pressure line at a selected measuring location comprising: a first coupling part and a second coupling part each defining therein an axial through passage, a fluid flow blocking element for each said coupling part for at times blocking said through passage in the respective coupling part, means in each said coupling part for normally urging the respective blocking element into a fluid flow blocking position relative to the corresponding axial passage, means for releasably engaging said first and second coupling parts with the respective through passages therein being axially aligned in a fluid-tight coupling relationship, actuating means including a push rod defining therein over at least a portion of its length at least one axial groove and being slidably supported in the axially aligned through passages of said first and second coupling parts, means including a portion of reduced cross-sectional area at each end of said rod which is axially movable in a mating bore in a corresponding coupling part, each said portion forming a peripheral shoulder which coacts with an abutment in the respective coupling part to limit thereby the extent of insertion of each end of said rod into the corresponding coupling part in accordance with the length of the respective end of said portion of reduced cross-sectional area and thereby also the extent of movement of the corresponding fluid flow blocking element from its blocking position in response to the coupling of said parts, said push rod having a collar portion over a part of its length which is of greater diameter than that of the remainder of said push rod, an externally threaded bushing member threadably engaging with one of said coupling parts and having an abutment which cooperates with said collar portion on said push rod to limit the extent of withdrawal of said push rod from said one coupling part, said bushing member defining a sleeve portion to slidingly receive a portion of said push rod to thereby guard against tilting movement of said push rod.