| 主权项 |
1. A multifunction safety lock means, which is a pressure indicator cum lock means for a pressure cooker, which lock means is a pressure response type body comprising:
a. a pressure monitoring means comprising a moving rod that moves between a first state and a second state with a moveable sealing silicone washer mounted thereon and combinedly mounted freely across a hole formed on a cover of the cooker with the washer positioned underneath the cover, and which rod and washer move upward under increasing pressure to lift the rod from the first state and the washer towards an underside of the cover thereby pushing sealingly the washer until positioned against the underside of the cover to seal the hole, the rod also extending upwardly above the top surface of the cover to reach the second state of the rod and adapted further to move downward under decreasing pressure to drop the rod from the second state and the washer away from the underside of the cover thereby unsealingly moving the washer away from the underside of the cover to unseal the hole and the rod dropping downwardly until a rod head is seated against a top surface of the cover to reset into the first state of the rod, wherein the first state of the rod is indicative of zero internal pressure and the second state of the rod is indicative of an operating internal pressure of the cooker, b. a locking means of push rod type operably associated with the pressure monitoring means comprising a first end connected to a top end of the rod and a second end terminating near a peripheral edge of the cover and passing through a hole formed on the peripheral edge of the cover, such that the second end of lock means is responsive and representative of a state of the rod having two positions, which are an extended state and retracted state of the lock means corresponding to the second state and the first state of the rod of the pressure monitoring means, c. a plurality of locking lugs on a base container associated with matching locking lugs on the cooker cover, with a first set of matching locking lugs of the container adapted to engage with the locking means on the cover, and d. the arrangement characterized in that:
(i) ordinarily securely locking the cooker cover with the container when the first set of matching locking lugs of the container is engaged with the locking means on the cover so that the internal pressure builds up beyond a predetermined value and the locking rod is in the extended state,(ii) ordinarily securely unlocking the cover from the container when the internal pressure is released entirely and the locking rod is in the retracted state,(iii) ordinarily preventing pressure buildup if the first set of matching locking lugs of the container is not engaged with the locking means on the cover, and(iv) an intentional manual downward push motion of the rod of the locking means releases the internal pressure rapidly. |
