Mechanised display panels

Claim 1

AN ACTUATING DEVICE FOR THE OPERATION OF A MOVABLE PART OF A MECHANIZED DISPLAY PANEL COMPRISING A REVERSIBLE DIRECT CURRENT ELECTRIC MOTOR, SPEED REDUCTION MEANS HAVING AN INPUT SHAFT COUPLED TO THE MOTOR AND A FIRST OUTPUT SHAFT COUPLED TO OPERATE A MOVABLE PART OF A MECHANIZED DISPLAY PANEL, MULTIPLE-CONTACT SWITCHING MEANS HAVING A ROTOR MECHANICALLY COUPLED TO A SECOND OUTPUT SHAFT OF THE SPEED REDUCTION MEANS AND ELECTRICALLY CONNECTED IN CIRCUIT WITH THE MOTOR, FIRST AND SECOND RECTIFIERS OPPOSITELY SENSED FOR CURRENT FLOW THERETHROUGH AND RESPECTIVELY CONNECTED IN SERIES TO FIRST AND SECOND CONTACTS AND THE INTERMEDIATE CONTACTS OF THE SWITCHING MEANS, THE TWO RECTIFIERS AND ANY INTERMEDIATE CONTACTS BETWEEN SAID FIRST AND SECOND CONTACTS BEING TOGETHER CONNECTABLE SELECTIVELY TO EITHER POLE OF A DIRECT CURRENT SOURCE AND SELECTIVELY CONNECTABLE IN CIRCUIT WITH THE MOTOR BY ROTATION OF THE ROTOR OF THE SWITCHING MEANS, SO THAT WHEN THE TWO RECTIFIERS AND THE INTERMEDIATE CONTACTS ARE CONNECTED TO THE POSITIVE POLE OF THE DIRECT CURRENT SOURCE CURRENT WILL FLOW THROUGH THE MOTOR IN ONE DIRECTION WHEN ANY ONE OF THE FIRST CONTACT AND IN THE INTERMEDIATE CONTACT IS CLOSED BUT NO CURRENT WILL FLOW THROUGH THE MOTOR WHEN THE SECOND CONTACT IS CLOSED, AND WHEN THE TWO RECTIFIERS AND THE INTERMEDIATE CONTACTS ARE CONNECTED TO THE NEGATIVE POLE OF THE DIRECT CURRENT SOURCE CURRENT WILL FLOW THROUGH THE MOTOR IN A DIRECTION OPPOSITE TO SAID ONE DIRECTION WHEN ANY ONE OF THE SECOND CONTACT AND THE INTERMEDIATE CONTACTS IS CLOSED BUT NO CURRENT WILL FLOW THROUGH THE MOTOR WHEN THE FIRST CONTACT IS CLOSED, WHEREBY THE MOTOR IS AUTOMATICALLY EFFECTIVE TO ROTATE SAID INPUT SHAFT AND THEREBY THE ROTOR OF THE SWITCHING MEANS TO CLOSE THE CONTACT WHICH STOPS FLOW OF CURRENT THROUGH THE MOTOR AND THE SPACING BETWEEN THE FIRST AND SECOND CONTACTS DETERMINES THE EXTENT OF POSSIBLE MOVEMENT OF SAID MOVABLE PART.