Hydraulic system air bleeder valve assembly with antivibration spring retainer

Claim 1

A combination closure and bleeder valve assembly for permanent mounting in the threaded bleeder outlet opening of a hydraulic system, said opening having an internal seat therein, said assembly comprising: an elongated body having a longitudinal axis, said body having a forward end having a closure surface symmetrical about said axis for seating against said seat, said body Having a set of external threads intermediate the ends thereof, said body having a longitudinal bleeder passage extending from adjacent its outer end to a point which is adjacent its inner end but is spaced outwardly from said closure surface, said passage having an annular internal shoulder therin defining a spring check valve seat, a check valve in said passage adjacent said spring check valve seat, a compression spring in said passage and disposed rearwardly from said check valve, said body having a certain internal sidewall portion surrounding an outer portion of said passage, an elongated spring retainer in said outer portion of said passage and pressing transversely of and against said certain internal sidewall portion with a force sufficient for the purpose of anchoring said retainer in place against the force of said spring, said spring retainer being specifically an elongated roll-pin formed of resilient material and having a cross-section at any point along its length which is substantially C-shaped, said roll-pin having a continuous slot extending from one end to the other thereof.