Stud driving tool

Claim 1

IN AN EXPLOSIVELY-ACTUATED TOOL OF THE CHARACTER DESCRIBED FOR DRIVING STUDS OF VARIOUS LENGTHS INTO A WORK PIECE CONSISTING OF HARD MATERIAL, FIRST MEANS HAVING A WORK ENGAGING SURFACE AND A STUD RECEIVING BORE WITH AN OPEN MOUTH AT THE LOWER END THEREOF, SECOND MEANS EXTENDING UP FROM AND FIXED TO SAID FIRST MEANS AND HAVING AN ELONGATED CYLINDRICAL PISTON BORE OF UNIFORM CROSSSECTION IN AXIAL ALIGNMENT WITH SAID STUD BORE, A PISTON MEMBER AXIALLY SLIDABLE WITHIN SAID PISTON BORE, SAID PISTON MEMBER HAVING A PORTION PROJECTING OUT OF SAID PISTON BORE ADAPTED TO RECEIVE A MANUALLY STRUCK BLOW ON AN UPPER END THEREOF, A HAMMER MEMBER IN SAID PISTON BORE BELOW SAID PISTON MEMBER, SAID HAMMER MEMBER BEING SLIDABLE IN SAID PISTON BORE FOR MOVEMENT WITH SAID PISTON MEMBER, SAID HAMMER MEMBER HAVING A DRIVING END TO CONTACT THE REAR END OF A STUD IN SAID STUD BORE WITH ITS TIP IN POSITION TO CONTACT THE WORK; ONE OF SAID SLIDABLE MEMBERS HAVING A RECESS TO RECEIVE A CARTRIDGE WITH ITS BASE ADJACENT THE OTHER MEMBER, SAID OTHER MEMBER HAVING FIRING MEANS TO IMPACT AGAINST SAID CARTRIDGE BASE TO FIRE THE CARTRIDGE UPON SAID PISTON MEMBER BEING STRUCK WHILE A STUD IS IN SAID STUD CHAMBER WITH ITS TIP AGAINST THE WORK, THUS EXPLOSIVELY FORCING SAID HAMMER MEMBER TOWARD SAID LOWER END TO DRIVE SAID STUD INTO THE WORK; SAID PISTON BORE PROVIDING GUIDE MEANS TO ACCOMMODATE AXIAL MOVEMENT OF BOTH SAID MEMBERS AND SAID CARTRIDGE AS A UNIT INTO FIRING POSITION AND TO GUIDE SAID HAMMER MEMBER TO DRIVE THE STUD INTO THE WORK FOLLOWING THE FIRING OF SAID CARTRIDGE.