Hand-operated grease gun head

Claim 1

IN A HAND OPERATED GREASE GUN HEAD, THE COMBINATION COMPRISING, AN ELONGATED TUBULAR BODY HAVING A FIRST BORE SPACED FROM ONE END THEREOF TO PROVIDE A HIGH PRESSURE CYLINDER, THE WALL OF SAID BODY AROUND SAID BORE HAVING A GREASE INTAKE PORT COMMUNICATING WITH SAID CYLINDER, SAID BODY HAVING A SECOND BORE OF LARGER DIAMETER THAN SAID FIRST BORE EXTENDING FROM SAID ONE END OF SAID BODY TO SAID FIRST BORE ON APPROXIMATELY THE SAME AXIS AS THAT OF SAID FIRST BORE, A PISTON RECEIVED IN SAID FIRST BORE FOR RECIPROCATION THEREIN AND EXTENDING INTO SAID SECOND BORE, AND A PISTON GUIDE RECEIVED IN CLOSE FITTING ENGAGEMENT IN SAID SECOND BORE FOR RECIPROCATION THEREIN AND FORMING A SEAL FOR SAID PISTON AND EXTENDING OUTWARDLY BEYOND SAID ONE END OF SAID BODY TO PERMIT ACTUATION THEREOF, THE OUTER END OF SAID PISTON HAVING A DIAMETER OF SIZE RELATIVE THE DIAMETER OF THE INNER END OF SAID GUIDE AND SAID OUTER AND INNER END BEING OPERATIVELY ENGAGED END TO END TO PERMIT FREE TRANSVERSE MOVEMENT THEREBETWEEN, THEREBY PERMITTING SAID PISTON TO CONFORM TO A DIFFERENT AXIS OF RECIPROCATION THAN THAT OF SAID GUIDE, AND A SPRING MEANS TO RETRACT SAID PISTON AND SAID PISTON GUIDE ASSOCIATED WITH SAID PISTON GUIDE AND IN OPERATIVE ENGAGEMENT WITH SAID TUBULAR BODY.