| 摘要 |
A retention mechanism comprises a post and a movable arm slidingly secured to the post. The post includes a plurality of serrations formed along an elongated side thereof. The movable arm includes a canister adapted to enclose and latch with the serrations of the post, and a securing portion extending from the canister for securing an upper edge of an edge card. The canister forms a pair of stoppers in two opposite holes defined in an outside wall thereof. Each stopper includes a lever and two ribs supporting the lever in the sidewall of the canister. Each lever forms an inwardly extending protrusion thereon. When lower ends of the levers are pushed inwardly toward each other, the levers pivot about the ribs and the protrusions move outwards from the serrations of the post, allowing the movable arm to slide along the elongated side of the post. When the movable arm reaches a desired height corresponding to the height of the upper edge of the edge card, the lower ends of the levers are released, allowing the protrusions to move inwardly to latch with the serrations, thereby securing the edge card in place.
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