| 摘要 |
An expansion mechanism for a meter box or a meter yoke. The mechanism includes a body having an at least partially threaded axial body opening passing therethrough. The body has four spaced spokes extending generally radially out therefrom in the form of a cross. The body has first and second diametrically opposed positioning prongs and a third positioning prong disposed generally midway between them. The three prongs each have inwardly-disposed lips at their outer ends. A bushing having a nut with a threaded female portion into which the meter threads and having a threaded male portion adapted to thread into the threaded body opening is provided. The bushing includes a sleeve adapted to pass through and partially out of the body opening when the threaded male portion is threaded into the threaded body opening. A cup having a cup opening passing therethrough and an outwardly flaring annular cup lip at one end thereof is also provided. The cup is positionable so that the cup opening is aligned with the body opening by inserting the cup lip between the first and second prongs and towards the third prong and being held at least partially in position by the lips of the three prongs. The sleeve passes at least partially into the cup opening after the cup has been positioned between the prongs and the bushing threaded towards the body. A rubber gasket is positioned inside of the prongs and between the cup lip and the body. The body, bushing and cup are each formed of a resilient plastic material.
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