Drill bit lubricator

Claim 1

A ROCK BIT HAVING A DEPENDING LEG AND A BEARING SHAFT THEREON, A ROLLER CUTTER MOUNTED ON SAID SHAFT, ANTIFRICTION BEARINGS, DISPOSED BETWEEN SAID SHAFT AND SAID CUTTER, A SEAL BETWEEN THE CUTER AND THE SHAFT, THE SAID DEPENDING LEG HAVING A LUBRICANT RESERVOIR THEREIN, MEANS FORMING A PASSAGEWAY COMMUNICATING BETWEEN THE LOWER END OF SAID LUBRICANT RESERVOIR AND THE INTERIOR OF SAID CUTTER, A DIAPHRAGM THE PERIPHERY OF WHICH IS SECURED TO A RING AND WHICH IS SUPPORTED ON A SHOULDER IN SAID RESERVOIR, SAID RING BEING HELD IN PLACE BY A DISC HAVING A VENT THERETHROUGH AND COMMUNICATING WITH THE EXTERIOR OF SAID BIT AND FITTED IN SAID RESERVOIR TO HOLD SAID RING AGAINST SAID SHOULDER, SAID DIAPHRAGM HAVING A SERIES OF UNDULATIONS ACROSS ITS BREADTH WHICH PERMIT THE INNER UNDULATIONS TO EXTEND UNDER PRESSURE OF THE FLUID OUTSIDE OF SAID RESERVOIR WHEREBY TO FORCE THE LUBRICANT TO THE INTERIOR OF SAID CUTTER.