Decompression devices for internal combustion engines

Claim 1

IN A VALVE CONTROLLED INTERNAL COMBUSTION ENGINE, IN COMBINATION; AN EXHAUST VALVE, EXHAUST VALVE GEAR COMPRISING MOVABLE MEMBERS OPERATING AND CONTROLLING SAID VALVE, AN ENGINE HOUSING A PART OF WHICH ACCOMMODATES AND SURROUNDS SAID VALVE GEAR, A ROTATABLE DECOMPRESSION ELEMENT CAPABLE OF BEING DISPOSED FOR ENGAGEMENT BY A RELEVANT ONE OF SAID VALVE OPERATING AND CONTROLLING MEMBERS SUCHWISE AS TO PREVENT FULL CLOSURE OF THE VALVE AND SO PRODUCE A CONDITION OF DECOMPRESSION, MEANS COUPLED TO THE DECOMPRESSION ELEMENT AND OPERABLE FOR TURNING SAID ELEMENT IN A DIRECTION TO TERMINATE DECOMPRESSION, A DRIVER FOR OPERATING SAID MEANS, SAID DRIVER BEING AUTOMATICALLY ACTUATABLE FROM ANOTHER OF THE AFORESAID MEMBERS OF THE EXHAUST VALVE GEAR, AND A COMMON CARRIER IN WHICH ARE MOUNTED THE DECOMPRESSION ELEMENT, THE MEANS COUPLED TO THE LATTER FOR TURNING IT AND THE SAID DRIVER BEING SUPPORTED BY A SPRING-BIASSED PLUNGER WHICH IS AXIALLY DISPLACEABLE IN THE COMMON CARRIER AND IS SO DISPOSED THAT, WHEN THE SAID CARRIER IS MOUNTED ON THE ENGINE HOUSING, AN END OF THE PLUNGER WILL, AS A MATTER OF COURSE, BE APPLIED AGAINST THE RELEVANT MOVABLE MEMBER OF THE EXHAUST VALVE GEAR.