Impact signal device with magnetically restrained inertia element

Claim 1

AN IMPACT PICK-UP DEVICE FOR OPENING AND CLOSING AN ELECTRIC CIRCUIT TO SUPPLY A SIGNAL IN RESPONSE TO IMPACT OF AN OBJECT AGAINST AN ABUTMENT INCLUDING IN COMBINATION AN ABUTMENT IN POSITION TO THE STRUCK, A HOUSING CONNECTED WITH THE ABUTMENT AND MOVABLE WITH THE ABUTMENT IN RESPONSE TO IMPACT OF AN OBJECT AGAINST SAID ABUTMENT, AN INERTIA ELEMENT IN THE HOUSING AND MOVABLE WITH RESPECT TO THE HOUSING IN RESPONSE TO SAID IMPACT, FIRST ELECTRICAL CONTACT MEANS IN A FIXED POSITION IN THE HOUSING AND INCLUDING A MAGNET THAT GIVES THE INERTIA ELEMENT A BIAS TOWARD A NORMAL POSITION IN WHICH THE INERTIA ELEMENT TOUCHES THE FIRST ELECTRIC CONTACT MEANS TO CLOSE A CIRCUIT, A SUPPORT ON WHICH THE INERTIA ELEMENT RESTS INCLUDING A CONDUCTOR IN AN ELECTRICAL CIRCUIT WITH THE INERTIA ELEMENT, SAID INERTIA ELEMENT CONSTITUTING A SECOND CONTACT AND CONSTITUTING WITH THE FIRST ELECTRIC CONTACT MEANS A SWITCH FOR OPENING AND CLOSING THE ELECTRIC CIRCUIT IN RESPONSE TO IMPACTS TO PRODUCT A SIGNAL IN SAID ELECTRIC CIRCUIT, AND ABUTMENTS CONFINING THE INERTIA ELEMENT TO A LIMITED RANGE OF MOVEMENT, THE MAGNET CONSTITUTING ONE OF THE ABUTMENTS, AND THE INERTIA ELEMENT CONTACTING WITH THE MAGNET AT ONE END OF THE RANGE OF MOVEMENT AND THE INERTIA ELE-