Patent ID: 7354191

Claim:
A mortar mixer comprising a trunnion assembly and a substantially cylindrical drum having end plates and an elongate paddle shaft defining an axis having a uniform diameter mounted horizontally and extending through an opening in one end plate into a bearing carried by said trunnion assembly, said trunnion assembly including a housing attached outwardly of said end plate and having all components of said trunnion assembly disposed outwardly of said end plate, said housing having an interior space defined by an interior surface around said shaft, a first seal means adjacent said end plate and positioned around and engaged with said shaft, first mounting means for affixing said first seal means between said shaft and said interior surface, a second seal means spaced outwardly from said first seal and positioned around and engaged with said shaft, second mounting means for affixing said second seal between said shaft and said interior surface, said first and second seal means being axially spaced in said interior space to define a first generally annular chamber therebetween around said shaft for carrying grease, said second seal means being axially spaced from said bearing in said interior spaced to define a second generally annular chamber therebetween around said shaft for carrying grease, said housing including a first grease passageway for providing grease into said first chamber to purge mortar contaminated grease therein back into said drum through said opening in said one end plate, and a second grease passageway spaced away from said first grease passageway for providing grease into said second chamber to grease said bearing and inhibit egress of mortar to said bearing, and said first and second grease passageways being separate, distinct and non-communicating with each other such that said first and second chambers are individually periodically pressured and greased respectively from said first and second grease passageways.