SAFETY DEVICE AGAINST EXCESS PRESSURE BY JOINT CREEP FOR PRESSURE COOKER WITH MANHOLE-TYPE LID

摘要

The invention concerns a safety device against excess pressure for a pressure cooker with manhole-type lid comprising a cooking vessel (1), with an out-of-round opening defined by an inset rim (4) wherein can be inserted an out-of-round lid (10) to close the vessel (1) via a sealing joint (11), mounted in a groove (12) forming a curled edge. The invention is characterised in that substantially in the zone (S) corresponding to the large diameter (D) of the lid (10), the groove (12) comprises creep means (20, 21) for the joint (11), and the joint (11), the inset rim (4) and the lid (10) are shaped such that in the event of excess pressure, the joint (11) is locally deformed by the creep means (20, 21). The invention is applicable to pressure cookers for domestic use.