Safety device for opening and closing a pressure-cooking appliance without danger

Claim 1

A safety device for opening and closing a pressure-cooking appliance comprising a pressure vessel (1) on which is mounted a lid (2), the rim of said lid and the rim of said vessel being provided with locking ramps (3, 4) which are intended to engage one beneath the other and to lock the lid in position on the vessel by rotational displacement, said lid (2) and said vessel (1) being each provided with a handle (5, 6), the lid being provided with an opening (8) which communicates with the interior of the pressure vessel (1) and in which is mounted a stem (9) fitted with a valve head having the function of closing said opening when the pressure within the vessel (1) attains a predetermined value, said device comprising associated means adapted to cooperate with the stem (9) of the valve (10) of the lid (2) in order to prevent closure of the valve (10) as long as the two handles (5, 6) are not in the closed position and in order to prevent opening of the lid (2) when the two handles (5, 6) are in the locking position as long as the valve (10) is in the closed position, wherein said associated means comprise a locking member (11) slidably mounted in the handle (5) and adapted to carry a push-rod (16), said locking member (11) being constituted by a portion (14) which extends to a point located above the valve stem (9) and which is provided with a hole (15), wherein a locking ramp (18) formed on the pressure vessel handle (6) is adapted to cooperate with the push-rod (16) of the locking member in order to thrust said push-rod into a position such that the valve stem (9) is permitted to engage in the hole (15) of said locking member extension (14) when the two handles (5, 6) are in the fully closed position and locked together by the push-rod (16) of said locking member (11).