Oil pressure indicator for internal combustion engines

Claim 1

AN INDICATING DEVICE FOR THE OIL PRESSURE IN THE LUBRICATING SYSTEM OF INTERNAL COMBUSTION ENGINES AND ESPECIALLY FOR MOTOR VEHICLE INTERNAL COMBUSTION ENGINES, COMPRISING CONTROL LIGHT MEANS OPERATIVE TO PRODUCE A WARMING LIGHT IN DEPENDENCE ON THE OIL PRESSURE, AND MEANS FOR ENERGIZING SAID CONTROL LIGHT MEANS IN THE ABSENCE OF A MIMIMUM OIL PRESSURE INCLUDING AN ENERGIZING CIRCUIT AND OIL PRESSURE STEPPING SWITCH MEANS CONNECTED TO SAID CONTROL LIGHT MEANS FOR DETERMINING THE VALUE OF OIL PRESSURE IN SAID INTERNAL COMBUSTION ENGINE, AND ENGINE-ROTATIONAL SPEED STEPPING SWITCH MEANS CONNECTED TO SAID ENERGISING CIRCUIT AND SAID STEPPING SWITCH MEANS FOR CHANGING THE MINIMUM VALUE OF OIL PRESSURE AT WHICH ENERGIZATION OF SAID CONTROL LIGHT MEANS OCCURS IN DEPENDENCE UPON THE ENGINE ROTATIONAL SPEED, SAID OIL-PRESSURE STEPPING SWITCH MEANS BEING IN THE FORM OF A MEMBRANETYPE SWITCH HAVING A PLURALITY OF CONTACT STEPS DISPOSED ONE BEHIND THE OTHER EFFECTIVELY IN THE DIRECTION OF PRESSURE AND SPRING MEANS COORDINATED TO EACH STEP FOR BIASING SAID STEP SO THAT AN OPENING OF EACH CONTACT STEP TAKES PLACE AGAINST THE FORCE OF THE SPRING MEANS COORDINATED THERETO IN ADDITION TO THE FORCE EXERTED BY THE SPRING MEANS OF ALL PRECEDING CONTACTS STEPS.