Patent ID: 8585314

Claim:
A quick fastening device comprising a safety device and being of the type comprising first and second portions, where said first portion is fixed to an arm of a machine and said second portion is fixed to a tool, said first portion comprising a cradle that is insertable under a shaft of said second portion, a median portion of said second portion having an extension in the shape of a hook, said hook-shaped extension having at least one lateral lug that can pass through a notched opening of said first portion and a notched opening of a locking plate, said locking plate being capable of sliding on a median portion of said first portion in order to be inserted under the hook by the action of springs biasing the plate in a forward direction, characterized in that said first portion includes an abutment member and at least one flexible blade which is fixed on said locking plate and extends in the direction of movement of said locking plate, where a free portion of said blade is shaped to take support against said abutment member interposed in the path of said blade, such that said abutment member limits the movement of said locking plate in a backward direction if the springs break, detach or otherwise fail in order to prevent said notched openings from coinciding such that the hook-shaped extension can pass freely therethrough.