Interlocking device for electric typewriters

Claim 1

IN AN ELECTRIC TYPEWRITER HAVING A SET OF TYPE LEVERS PIVOTALLY MOUNTED ON A BASKET, A SET OF TYPE ACTIONS INDIVIDUALLY CONDITIONABLE FOR OPERATING THE CORRESPONDING ONE OF SAID TYPE LEVERS, A PAPER CARRIAGE, A DEPRESSIBLE CASE SHIFT KEY, AND A MECHANISM OPERABLE FOR CASE SHIFTING SAID BASKET WITH RESPECT TO SAID CARRIAGE BETWEEN A UPPER CASE AND A LOWER CASE THEREOF, AND INTERLOCKING DEVICE FOR SAID TYPE ACTIONS AND SAID MECHANISM, COMPRISING IN COMBINATION: (A) A UNIVERSAL MEMBER NORMALLY YIELDABLY MOVABLE FROM A FIRST TO A SECOND POSITION AT THE DEPRESSION OF EACH PRINTING KEY OF CONDITIONING THE CORRESPONDING ONE OF SAID TYPE ACTIONS FOR OPERATION, (B) MEANS FOR RETURNING SAID UNVERSAL MEMBER TO SAID FIRST POSITION AT THE END OF SAID OPERATION, (C) A CLUTCH HAVING A PAIR OF REST LOCATIONS ASSOCIATED WITH SAID UPPER AND LOWER CASE, SAID CLUTCH BEING ENGAGEABLE FOR POWER OPERATING SAID MECHANISM, (D) A CONTROL MEMBER NORMALLY LOCATED IN A FIRST POSITION TO HOLD SAID CLUTCH DISENGAGED IN EITHER OF SAID LOCATIONS, (E) YIELDABLE MEANS FOR MOVING SAID CONTROL MEMBER FROM SAID FIRST POSITION TO A SECOND POSITION TO CAUSE SAID CLUTCH TO BE ENGAGED, (F) A PAIR OF LEVERS FULCRUMED ON A COMMON PIVOT AND ADAPTED TO ALTERNATELY LOCK SAID CONTROL MEMBER IN SAID FIRST POSITION, SAID PAIR OF LEVERS BEING OPERATED BY SAID CASE SHIFT KEY FOR RELEASING SAID CONTROL MEMBER, (G) MEANS COMPRISED IN SAID MECHANISM FOR RETURNING SAID CONTROL MEMBER TO SAID FIRST POSITION AT THE END OF ITS SHIFTING OPERATION, (H) MEANS SHIFTABLE SIMULTANEOUSLY WITH SAID BASKET FOR ALTERNATING SAID PAIR OF LEVERS IN LOCKING SAID CONTROL MEMBER, (I) A FIRST ELEMENT INTEGRAL WITH SAID UNIVERSAL MEMBER, AND HAVING AN INTERCEPTING PORTION AND AN ABUTTING PORTION MOVABLE ALONG A FIRST PATH, (J) AND A SECOND ELEMENT INTEGRAL WITH SAID CONTROL MEMBER AND HAVING AN INTERCEPTING PORTION AND AN ABUTTING PORTION MOVABLE ALONG A SECOND PART INTERSECTING SAID FIRST PATH, (K) EACH ONE OF SAID TWO ELEMENTS WHEN LOCATED IN THE CORRESPONDING SECOND POSITION PLACING THE INTERCEPTING PORTION INTO THE PATH OF THE ABUTTING PORTION OF THE OTHER ELEMENT TO LOCK SAID OTHER ELEMENT.