| 摘要 |
A child-proof button includes a base formed with a tubular portion at one end thereof, and a disc portion at another end thereof, the tubular portion being used for riveting, the disc portion having a plurality of notches, a metal body portion made of zinc and by die-casting and having a plurality of pawls at a circumferential edge thereof and a recess at a center thereof, the metal body portion being provided with a plurality of through holes, the base being fitted in the metal body portion with some of the notches coincident with the through holes, the metal body portion together with the base being further processed with injection molding and plastic not only covers the metal body portion but also enters coincident the through holes and the notches, thereby forming a plastic cover even more firmly attached to the metal body portion.
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