Patent ID: 7611336

Claim:
A coupling structure of an operation rod in a pump comprising, a valve assembly having an outer sleeve as an outer valve, an inner sleeve as an inner valve rotatably installed in said outer sleeve, a pushing operation body including a sliding part installed in said inner sleeve and including a driven operation rod; a drive source; a driving operation rod driven by said drive source to move axially, said drive source including a support member guiding said driving operation rod; and a catching part of said valve assembly which engages with a connection-supporting device which is attached to said driving operation rod when said driven operation rod of said valve assembly and said driving operation rod of said drive source are connected, means pivotally mounting said connection-supporting device in a cantilevered state on said driving operation rod, a spring member biasing said connection-supporting device in a specified direction, said connection-supporting device including a vertical plate installed at a tip end portion of a pivoted plate for attachment and a locking part installed in a front surface of said vertical plate and projecting therefrom.