Feed transmission for electrically controlled machine tools

Claim 1

IN COMBINATION WITH A MACHINE TOOL HAVING A BED: A MOVABLE SUPPORT IN THE FORM OF A CARRIAGE MOVABLE ON THE BED; A CASING CONNECTED TO SAID BED; A PLANETARY GEAR TRANSMISSION ARRANGED IN SAID CASING AND INCLUDING A WORM WHEEL FORMING A PLANETARY GEAR CARRIER, PLANETARY GEARS ROTATABLY JOURNALLED IN SAID PLANETARY GEAR CARRIER, AND THE TWO SUN WHEELS MESHING WITH SAID PLANETARY GEARS; DRIVING MEANS FOR SELECTIVELY EFFECTING A FAST TRAVERSE OR A FEED MOVEMENT OF SAID SUPPORT; A WORM MESHING WITH SAID WORM WHEEL; TRANSMISSION MEANS DRIVINGLY CONNECTING SAID DRIVING MEANS WITH SAID WORM AND WITH ONE OF SAID SUN WHEELS; A FEED SPINDLE DRIVING CONNECTED TO THE OTHER OF SAID SUN WHEELS; SAID SPINDLE OPERATIVELY ENGAGING SAID SUPPORT; CAM MEANS CARRIED BY SAID SUPPORT; MEANS ON THE BED COOPERATING WITH SAID CAM MEANS INCLUDING FIXED ABUTMENT MEANS FOR LIMITING THE MAXIMUM TRAVEL OF SAID SUPPORT AND YEILDABLE ABUTMENT MEANS FOR CREATING RESISTANCE TO MOVEMENT OF SAID SUPPORT AT LEAST ONE POINT IN THE TRAVEL THEREOF; A WORM SHAFT FIXEDLY CONNECTED TO SAID WORM AND AXIALLY DISPLACEABLY MOUNTED IN SAID CASING; YIELDABLE SPRING MEANS ACTING UPON SAID WORM SHAFT AND YIELDABLY TO PERMIT MOVEMENT OF SAID WORM SHAFT IN THE AXIAL DIRECTION THEREOF; ELECTRIC SWITCH MEANS ELECTRICALLY CONNECTED TO SAID DRIVING MEANS; AND ACTUATING MEANS CONNECTED TO SAID WORM SHAFT FOR MOVEMENT THEREBY WHEN THE WORM SHAFT MOVES AXIALLY AND OPERABLE FOR ACTUATING SAID SWITCH MEANS WHEN SAID ACTUATING MEANS IS MOVED IN RESPONSE TO AXIAL MOVEMENT OF SAID WORM SHAFT AS BROUGHT ABOUT BY ENGAGEMENT OF SAID ABUTMENT MEANS BY SAID CAM MEANS.