Electrical switches

Claim 1

A SAFETY SWITCH AND PLUG ARRANGEMENT COMPRISING, IN COMBINATION, A CASING HAVING A FRONT PLATE BEING FORMED WITH A WINDOW AND WITH A PLURALITY OF OPENINGS SPACED FROM SAID WINDOW; SWITCH MEANS MOUNTED IN SAID CASING MOVABLE BETWEEN AN "ON" POSITION AND AN "OFF" POSITION AND HAVING OPERATING MEANS EXTENDING THROUGH SAID WINDOW TO THE EXTERIOR OF SAID CASING FOR MOVING SAID SWITCH MEANS BETWEEN SAID POSITIONS THEREOF; CONTACT MEANS IN SAID CASING AND ELECTRICALLY CONNECTED TO SAID SWITCH MEANS AND HAVING A PLURALITY OF FIRST CONTACT MEMBERS RESPECTIVELY ALIGNED WITH SAID PLURALITY OF OPENINGS IN SAID FRONT PLATE; REMOVABLE PLUG MEANS HAVING A PLURALITY OF SECOND CONTACT MEMBERS RESPECTIVELY INSERTABLE THROUGH SAID OPENINGS TO MAKE ELECTRICAL CONTACT WITH SAID FIRST CONTACT MEMBERS; COVER MEANS HINGED TO SAID CASING TILTABLE BETWEEN A CLOSED POSITION IN WHICH SAID COVER MEANS ENCOMPASSES PART OF SAID PLUG MEANS TO PREVENT REMOVAL THEREOF AND AN OPEN POSITION IN WHICH SAID COVER MEANS PERMITS WITHDRAWAL OF SAID SECOND CONTACT MEMBERS FROM SAID FIRST CONTACT MEMBERS AND THEREWITH REMOVAL OF SAID PLUG MEANS, SAID COVER MEANS BEING FORMED WITH A CUTOUT ALIGNED IN SAID CLOSED POSITION OF SAID COVER MEANS WITH SAID WINDOW PERMITTING OPERATION OF SAID SWITCH OPERATING MEANS IN SAID CLOSED POSITION OF SAID COVER MEANS; FIRST MANUALLY OPERABLE LOCKING MEANS COMPRISING A FIRST MEMBER MOUNTED ON SAID CASING AND A SECOND MEMBER MOUNTED ON SAID COVER AND COOPERATING WITH SAID FIRST MEMBER FOR PREVENTING MOVEMENT OF SAID COVER MEANS FROM SAID CLOSED TO SAID OPEN POSITION THEREOF AND ONE OF SAID MEMBERS BEING MOVABLE WITH RESPECT TO THE OTHER FROM AN ENGAGED TO A DISENGAGED POSITION IN WHICH SAID FIRST LOCKING MEANS DOES NOT PREVENT MOVEMENT OF SAID COVER MEANS FROM SAID CLOSED TO SAID OPEN POSITION; AND SECOND LOCKING MEANS OPERATIVELY CONNECTED TO SAID SWITCH MEANS AND BEING MOVABLE FROM A LOCKING POSITION IN WHICH SAID SECOND LOCKING MEANS ENGAGES SAID COVER MEANS TO PREVENT MOVEMENT OF THE LATTER TO SAID OPEN POSITION TO AN UNLOCKING POSITION ONLY BY TURNING SAID SWITCH MEANS FROM SAID "ON" TO SAID "OFF" POSITION THEREOF.