Fluid flow responsive switch apparatus

Claim 1

SWITCH APPARATUS RESPONSIVE TO THE VELOCITY OF A STREAM OF FLUID AND COMPRISING A HOUSING ADAPTED TO BE SECURED TO THE WALL OF A DUCT IN WHICH SUCH A STREAM MOVES, AND ARM PIVOTED WITHIN SAID HOUSING AND HAVING AN END PROJECTED BEYOND SAID HOUSING SO AS TO BE DISPOSABLE IN THE DUCT, VANE MEANS ON THE PROJECTED END OF SAID ARM IN POSITION TO BE INTERPOSED IN THE STREAM OF FLUID, A COUNTERWEIGHT ADJUSTABLY MOUNTED ON SAID ARM INTERMEDIATE THE ENDS THEREOF, A MAGNET ON THE END OF SAID ARM OPPOSITE SAID VANE MEANS, A SWITCH HAVING CONTACTS ADJACENT SAID MAGNET AND SUBJECT TO THE INFLUENCE OF SAID MAGNET WHEREBY THE PROXIMATE LOCATION OF SAID MAGNET DETERMINES THE CONDITION OF THE SWITCH CONTACTS RELATIVE TO THE OPENING AND CLOSING THEREOF, AND SPRING MEANS WITHIN SAID HOUSING ACTING ON SAID ARM AND EFFECTIVE IN COOPERATION WITH THE VELOCITY OF THE MAVING STREAM OF FLUID TO CONTROL MOVEMENT OF SAID ARM AND THE PROXIMATE LOCATION OF SAID MAGNET.