Pressure lubrication means for crawler tractor chain

Claim 1

A CHAIN LINK ASSEMBLY COMPRISING A FIRST SET OF LINKS, A BUSHING SECURED TO THE FIRST SET WITH ENDS PROTRUDING BEYOND THE LINKS, A SECOND SET OF LINKS, A PIN SECURED TO THE SECOND SET OF LINKS AND MOUNTED WITHIN THE BUSHING FOR RELATIVE MOVEMENT THEREWITH, THE PIN HAVING A RESERVOIR THEREIN WITH COMMUNICATION TO THE PIN SURFACE, THE SECOND SET OF LINKS HAVING RECESSES COAXIAL WITH THE PIN INTO WHICH THE ENDS OF THE BUSHING ARE RECEIVED FREELY, A RESILIENT SEAL IN ABUTTING CONTACT WITH EACH END OF SAID BUSHING WITHIN THE RECESSES AND IN FRICTIONAL ENGAGEMENT WITH THE PIN SURFACE, MEANS WITHIN EACH RECESS FOR URGING THE SEAL INTO FIRM CONTACT AGAINST THE BUSHING END AND THE PIN SURFACE, MEANS FOR MAINTAINING A LUBRICANT UNDER PRESSURE IN THE RESERVOIR FOR LUBRICATING THE PIN SURFACE AND FOR APPLYING PRESSURE AGAINST EACH SEAL TOWARD SAID RECESSES OF THE LINKS WHEREBY EACH SEAL IS FURTHER COMPRESSED INTO SEALING ENGAGEMENT WITH THE PIN SURFACE, AND FITTING MEANS FOR ADMITTING LUBRICANT UNDER PRESSURE INTO THE PIN RESERVOIR.