Cyclic lubricating means

Claim 1

A LUBRICATING SYSTEM FOR SUPPLYING LUBRICANT TO SEVERAL STATIONS AND PROPORTIONING THE SUPPLIED LUBRICANT BETWEEN THE SEVERAL STATIONS FROM A SUPPLY SOURCE WHICH SUPPLIES LUBRICANT TO THE SYSTEM AGAINST VARYING BACK PRESSURE SO LONG AS THE BACK PRESSURE DOES NOT EXCEED A MAXIMUM, COMPRISING A CYCLING LUBRICANT DISTRIBUTOR HAVING A FLUID SUPPLY HEADER FOR RECEIVING LUBRICANT FROM SAID SUPPLY SOURCE, OUTLET BRANCH LINES LEADING OUT OF SAID DISTRIBUTOR AND COMMUNICATING WITH SAID SEVERAL STATIONS, SAID DISTRIBUTOR COMPRISING A PLURALITY OF VALVE-ANDPLUNGER UNITS, EACH UNIT HAVING FIRST AND SECOND HYDRAULIC PISTON CHAMBERS AND A PAIR OF HYDRAULIC PISTONS EACH IN ITS OWN ONE OF SAID PAIR OF CHAMBERS IN LUBRICANT SEALING SLIDING RELATIONSHIP WITH ITS SAID OWN ONE OF SAID PAIR OF CHAMBERS, EACH SAID UNIT INCLUDING LINKAGE MEANS FOR LINKING ITS SAID PAIR OF HYDRAULIC PISTONS FOR MOVEMENT TOGETHER AND IN HYDRAULIC OPPOSITION TO EACH OTHER BACK AND FORTH BETWEEN FIRST AND SECOND LIMITING END POSITIONS, EACH SAID UNIT ALSO INCLUDING VALVE MEANS ASSOCIATED FOR MOVEMENT WITH SAID LINKAGE MEANS, FIRST, SECOND, THIRD, FOURTH AND FIFTH VALVE PORTS ASSOCIATED WITH EACH OF SAID VALVE MEANS, SAID FIRST AND FIFTH VALVE PORTS BEING INTERCONNECTED AND SAID SECOND AND FOURTH VALVE PORTS BEING INTERCONNECTED WHEN SAID FIRST LIMITING END POSITION OBTAINS BUT NOT WHEN SAID SECOND LIMITING END POSITION OBTAINS, AND SAID FIRST AND THIRD VALVE PORTS BEING INTERCONNECTED AND SAID SECOND AND FIFTH VALVE PORTS BEING INTERCONNECTED WHEN SAID SECOND LIMITING END POSITION OBTAINS BUT NOT WHEN SAID FIRST LIMITING END POSITION OB-