Patent ID: 7685920

Claim:
An article comprising a closure for a canister, wherein the closure comprises: an outer cover, wherein the outer cover is dimensioned to substantially seal an end of said canister; and a passively-actuated actuation mechanism for reversibly coupling the closure to the canister, wherein the actuation mechanism comprises: a pressure plate, wherein the pressure plate is spaced apart from the outer cover, defining a cavity therebetween; a spring-biasing element for biasing the pressure plate away from the outer cover, wherein the spring-biasing element is disposed in the cavity; and a coupling element for reversibly coupling the outer cover to the canister, wherein the pressure plate is operatively coupled to the coupling element; and a ring, wherein the ring depends from a major surface of the pressure plate that faces away from the outer cover, wherein the ring is coaxial with the pressure plate, wherein a diameter of the ring is smaller than a diameter of the pressure plate, wherein the major surface of the pressure plate comprises a plurality of openings, and wherein the openings are disposed at a peripheral region of the plate that begins radially outward of the ring.