Bumper constructions for floor trucks of driveline systems

Claim 1

A FLOOR TRUCK DRIVE LINE SYSTEM HAVING A POWERED MAIN LINE INCLUDING A GUIDE SLOT AND PROPELLING MEMBERS OPERATING THEREIN, A NON-POWERED SPUR LINE INCLUDING A GUIDE SLOT AND MEANS AT A SWITCH ZONE FOR DIVERTING A FLOOR TRUCK FROM THE MAIN TO THE SPUR LINE, THE FLOOR TRUCKS EACH BEING EQUIPPED WITH A DRIVE PIN ENGAGEABLE WITH A PROPELLING MEMBER AND DRIVE PIN RELEASING MEANS NORMALLY OPERABLE TO MOVE THE DRIVE PIN TO A NON-DRIVING POSITION IN RESPONSE TO CONTACT BETWEEN A FLOOR TRUCK AND THE REAR OF A PRECEDING TRUCK, CHARACTERIZED BY (A) MEANS FOR DISABLING THE DRIVE PIN RELEASING MEANS WHEREBY A FLOOR TRUCK DIVERTED ONTO A SPUR LINE MAY BE PUSHED OUT OF THE MAIN LINE PATH OF FLOOR TRUCK TRAVEL BY A FOLLOWING NON-DIVERTED FLOOR TRUCK COMPRISING (B)A LOCK-OUT MEMBER MOUNTED ON A FLOOR TRUCK FOR MOVEMENT FROM AN INOPERATIVE POSITION TO AN OPERATIVE POSITION IN WHICH SAID MEMBER PREVENTS NORMAL OPERATION OF THE DRIVE PIN RELEASING MEANS, (C) ACTUATING MEANS FOR MOVING SAID LOCK-OUT MEMBER TO OPERATIVE POSITION IN ADVANCE OF A SWITCH ZONE AND HOLDING IT THEREIN ALONG THE MAIN LINE PATH OF TRAVEL THROUGH THE SWITCH ZONE AND (D) MEANS FOR RESETTING SAID LOCK-OUT MEMBER TO INOPERATIVE POSITION FOLLOWING THE SWITCH ZONE.