Rotary-hammer device

Claim 1

A ROTARY-HAMMER DEVICE COMPRISING, A CASING, A CYLINDER ROTATABLY MOUNTED IN THE CASING, A NOSE ASSEMBLY NON-ROTATABLY MOUNTED ON SAID CASING ADJACENT ONE END OF SAID CYLINDER, SAID NOSE ASSEMBLY INCLUDING A GENERALLY CYLINDRICAL TOOL HOLDER EXTENDING AXIALLY OF SAID CYLINDER, WHICH TOOL HOLDER IS ADAPTED TO RECEIVE AN ELONGATED TOOL ELEMENT FOR SUPPORTING THE SAME AXIALLY OF SAID CYLINDER, SAID TOOL HOLDER HAVING AN ANNULAR BEARING SURFACE IN SUBSTANTIAL SPACED RELATION FROM SAID ONE END OF THE CYLINDER FOR GUIDING ENGAGEMENT WITH THE TOOL ELEMENT, A TOOL DRIVING MEMBER MOUNTED IN SAID ONE END OF THE CYLINDER FOR ROTATION THEREWITH, SAID MEMBER BEING CENTRALLY BORED FOR RECEPTION OF A SHANK PORTION OF SAID TOOL ELEMENT AND SAID MEMBER HAVING MEANS FOR TRANSMITTING ROTATION TO THE TOOL ELEMENT, STRIKER MEANS IN SAID CYLINDER MOUNTED FOR RECIPROCAL MOVEMENT THEREIN AND ADAPTED FOR IMPARTING A HAMMER-LIKE ACTION TO SAID TOOL ELEMENT HELD IN SAID TOOL HOLDER AND EXTENDING THROUGH SAID TOOL DRIVING MEMBER, MOTOR MEANS IN SAID CASING, AND SEPARATE DRIVE MEANS FROM SAID MOTOR MEANS FOR SIMULTANEOUSLY ACTUATING SAID STRIKER MEANS AND FOR ROTATING SAID CYLINDER.