Safety belt buckle provided with electric contact

Claim 1

A safety belt buckle comprising a buckle casing to be connected to one part of the safety belt assembly, a spring loaded locking member moveably mounted in said buckle casing, a tongue connected to another part of the safety belt, said tongue being insertable into said buckle casing and having a configuration whereby said tongue moves said member against the action of its spring until said locking member snaps into its locking position in and retains said tongue, manually operable means being provided for moving said locking member to release said tongue, spring biasing means capable of ejecting said tongue when released from said buckle casing, an electric switch in said buckle casing comprising a first electric contact member being moveably positioned for being moved between three positions by said tongue and said spring biasing means, a second contact member being fastened to said buckle casing, electric insulating means electrically insulating said first electric contact member from said buckle casing, a first position of said three positions having said two contact members interconnected when said tongue is in its released position, a second of said positions having said two contact members disconnected when said tongue is in its normal locked position and a third of said positioned having said two contact members being interconnected when said tongue is pressed further inwards against said spring biasing means.