Wellhead with tool diverter

Claim 1

A WELLHEAD ASSEMBLY COMPRISING A VERTICALLY-POSITIONED PIPE STRING, A Y-BRANCHED SPOOL PIECE CONNECTED INTO SAID PIPE STRING, SAID SPOOL PIECE HAVING A VERTICAL THROUGH BORE IN COAXIAL ALIGNMENT WITH SAID PIPE STRING, A SMOOTHLY-CURVING BRANCHING SIDE BORE ADPATED TO BE CONNECTED TO A PIPE LINE, TOOL SWITCHING MEANS PIVOTALLY MOUNTED WITHIN AND TO SAID SPOOL PIECE ADJACENT THE INTERSECTION OF SAID THROUGH BORE AND SAID SIDE BORE, SAID TOOL SWITCHING MEANS INCLUDING A DEPENDING ARM ELEMENT PIVOTALLY MOUNTED AT THE TOP THEREOF TO THE WALL OF SAID SPOOL PIECE AT THE INTERSECTION OF SAID BORE THEREOF, AND IMPACT-ACTUATABLE POSITIONING MEANS CARRIED BY SAID ARM ELEMENT, SAID POSITIONING MEANS INCLUDING MEANS ENGAGEABLE WITH SAID SPOOL PIECE FOR POSITIONING AND RETAINING SAID ARM ELEMENT AGAINST THE INNER WALL OF SAID SPOOL PIECE TO BLOCK SELECTIVELY ONE OF SAID BORES AGAINST THE PASSAGE OF A TOOL THEREINTO FROM SAID PIPE STRING AND TO OPEN THE OTHER OF SAID BORES, SAID POSITIONING MEANS ADAPTED TO BE ACTUATED BY A TOOL STRIKING SAID ARM ELEMENT AS IT PASSES THROUGH ONE OF SAID BORES INTO SAID PIPE STRING.