| 摘要 |
A metal aerosol type canister, the top of which is cylindrical and is provided with three annular grooves forming three annular ribs, each of which ribs has a narrow gap, all three of which gaps are aligned axially. A mark is provided on the cannister body which is aligned with said gaps and low enough to be exposed to view when a safety cap is applied to cover the canister top. This cap is a hollow cylinder having an internal lug which must be aligned with said gaps in order for the cap to be applied to or removed from the canister. Such alignment is facilitated by an external mark on the cap which is radially aligned with said lug. Above said lug, the cap is provided with an annular internal recess for holding a pair of plastic rings snapped in place in said recess so as to be trapped therein, in end-to-end relation. Semi-annular slots are formed in the cap in the area of said recess to accommodate two finger engaging lugs, one of which extends radially outwardly from each ring for use in manually rotating said rings independently of each other. Each ring also has a locking lug extending radially inwardly therefrom and these lugs must both be axially aligned with said mark on said cap and the mark on the canister for the cap to be applied to or removed from the latter. Circumferentially spaced on said rings and outwardly exposed through said semi-annular slots are code marks for enabling a person who understands the code combination to set the rings to properly align the internal ring lugs for facilitating applying the cap to or removing the same from the container.
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