Method of manufacture of annular metal articles

Claim 1

THE METHOD OF MAKING AN ANNULAR METAL ARTICLE HAVING A SLEEVE-LIKE BODY WITH A SMOOTH BORE AND AN EXTERNAL RIB OF SHOULDERED FORMATION SYMMETRICALLY DISPOSED BETWEEN RELATIVELY NARROW RIM-LIKE ANNUALR EXTREMITIES, SAID METHOD COMPRISING TRUING A RELATIVELY SHORT PIECE OF ROD STOCK TO PROVIDE A BLANK, THEN INDENTING THE RESPECTIVE SIDE FACES OF THE BLANK IN TWO STEPS WITH INTERVENING TRANSFER OF THE BLANK BETWEEN TWO DIE-AND-PUNCH STATIONS TO REVERSE THE BLANK END FOR END FOR FORMING ANNULAR, AXIALLY PROJECTING RIM-LIKE PROJECTIONS AT THE RESPECTIVE ENDS OF THE BLANK BY EXTRUSION OF THE METAL WITHOUT RADIALLY INCREASING THE SIZE OF THE BLANK, THEN AT A FURTHER DIE-AND-PUNCH STATION COMPRESSING AND SHORTENING THE BLANK WHILE PRESERVING THE RIM-LIKE PROJECTIONS AND FORMING A LATERALLY PROJECTING EXTERNAL RIB ON THE BODY, INTERMEDIATE THE ENDS THEREOF, HAVING A THICKNESS NOTABLY GREATER THAN THAT OF THE RIM-LIKE PROJECTIONS, WHEREBY THERE IS FORMED A SHALLOW WEB IN THE SLEEVE INTERIOR, AND THEN PIERCING THE BLANK AT A FURTHER STATION TO REMOVE SAID WEB.

Claim 2

THE METHOD OF MAKING AN ANNULAR METAL ARTICLE HAVING A SLEEVE-LIKE BODY WITH A SMOOTH BORE AND AN EXTERNAL RIB OF SHOULDERED FORMATION SYMMETRICALLY DISPOSED BETWEEN RELATIVELY NARROW RIM-LIKE ANNUALR EXTREMITIES, SAID METHOD COMPRISING TRUING A RELATIVELY SHORT PIECE OF ROD STOCK TO PROVIDE A BLANK, THEN INDENTING THE RESPECTIVE SIDE FACES OF THE BLANK IN TWO STEPS WITH INTERVENING TRANSFER OF THE BLANK BETWEEN TWO DIE-AND-PUNCH STATIONS TO REVERSE THE BLANK END FOR END FOR FORMING ANNULAR, AXIALLY PROJECTING RIM-LIKE PROJECTIONS AT THE RESPECTIVE ENDS OF THE BLANK BY EXTRUSION OF THE METAL WITHOUT RADIALLY INCREASING THE SIZE OF THE BLANK, THEN AT A FURTHER DIE-AND-PUNCH STATION COMPRESSING AND SHORTENING THE BLANK WHILE PRESERVING THE RIM-LIKE PROJECTIONS AND FORMING A LATERALLY PROJECTING EXTERNAL RIB ON THE BODY, INTERMEDIATE THE ENDS THEREOF, HAVING A THICKNESS NOTABLY GREATER THAN THAT OF THE RIM-LIKE PROJECTIONS, WHEREBY THERE IS FORMED A SHALLOW WEB IN THE SLEEVE INTERIOR, AND THEN PIERCING THE BLANK AT A FURTHER STATION TO REMOVE SAID WEB.