Telephone call timer

Claim 1

AN INTERVAL TIMER COMPRISING, IN COMBINATION, A FRAME, A DRIVE ELEMENT JOURNALLED IN SAID FRAME AND COUPLED TO A TIMING TRAIN FOR ROTATION IN ONE DIRECTION, A ROTATABLE DRIVEN ELEMENT JOURNALLED IN SAID FRAME IN ALINEMENT WITH SAID DRIVE ELEMENT AND BEING BIASED TO A STARTING POSITION, A DISENGAGEABLE CLUTCH COUPLING SAID DRIVE AND DRIVEN ELEMENTS, AN ON SIGNAL, AN OPERATOR SHIFTABLY MOUNTED ON SAID FRAME FOR MOVEMENT BETWEEN ON AND OFF POSITIONS, MEANS FOR DISENGAGING SAID CLUTCH AND LOCKING SAID DRIVEN ELEMENT AGAINST ROTATION WHEN SAID OPERATOR IS IN OFF POSITION AND ENGAGING THE CLUTCH AND OPERATING SAID ON SIGNAL WHEN THE OPERATOR IS IN ON POSITION, AN ELAPSED TIME INDICATOR COUPLED FOR MOVEMENT WITH SAID DRIVEN ELEMENT, A WARNING SIGNAL, MEANS COUPLED TO SAID INDICATOR FOR OPERATING SAID WARNING SIGNAL WHEN THE INDICATOR SHOWS THE EXPIRATION OF A SELECTED INTERVAL, A CLUTCH RELEASING MEMBER MOUNTED ON SAID FRAME FOR MOVEMENT BETWEEN ACTIVE AND INACTIVE POSITIONS, MEANS COUPLING SAID MEMBER AND SAID CLUTCH FOR RELEASING SAID DRIVEN ELEMENT WHEN SAID MEMBER IS IN SAID ACTIVE POSITION SO THAT THE DRIVEN ELEMENT RETURNS UNDER THE FORCE OF SAID BIAS TO SAID STARTING POSITION.