Lead screw operated tapping spindle with quick acting reversing means

Claim 1

IN AN AUTOMATIC ATTACHMENT TO A POWER SPINDLE OF A MACHINE TOOL: A BODY, ONE END OF THE BODY HAVING PROVISIONS FOR NON-ROTARY ATTACHMENT TO THE TOOL IN CIRCUMSCRIBING RELATIONSHIP ABOUT ITS SAID POWER SPINDLE WITH THE END OF THE SPINDLE TERMINATING SHORT OF THE OTHER END OF THE BODY; A LEAD NUT MOUNTED AT THE OTHER END OF THE BODY OPPOSITE THE SPINDLE AND AT THE AXIS OF SAID SPINDLE AS DETERMINED BY SAID ATTACHMENT PROVISIONS; A LEAD SCREW RECEIVED IN THE LEAD NUT AND HAVING A TOOL HOLDING PART AT ITS OUTER END; A TOOL SHAFT MOUNTED BY THE BODY FOR ROTATION ABOUT SAID AXIS AND IN LINE WITH SAID SPINDLE, SAID TOOL SHAFT HAVING AN AXIALLY SLIDABLE DRIVING CONNECTION WITH SAID LEAD SCREW; SAID TOOL SHAFT BEING CONFINED AGAINST AXIAL MOVEMENT; A PAIR OF SPACED OPPOSED DRIVE MEMBERS MOUNTED BY SAID BODY FOR ANGULAR MOVEMENT ABOUT SAID AXIS; MEANS DERIVING POWER FROM SAID SPINDLE FOR OPPOSITELY ROTATING SAID DRIVE MEMBERS; A CLUTCH ROTATABLY COUPLED TO SAID TOOL SHAFT AND SLIDABLE ALONG THE TOOL SHAFT AND BETWEEN SAID DRIVE MEMBERS TO ENGAGE AND BE DRIVEN THEREBY; AND MEANS OPERATED UPON PREDETERMINED SPIRAL MOVEMENT OF SAID LEAD SCREW FOR MOVING THE CLUTCH BETWEEN ITS DRIVE MEMBERS.