| 摘要 |
A knockout arrangement for molded plastic electric wiring boxes in which the box is molded to define, at the juncture of the box side walls and back wall, and in conjunction with one or more of the box side walls, a corner segment having a pair of integral leaf portions of which one of the leaf portions is integral with the box side wall and the other leaf portion is integral with the box back wall. The respective segment leaf portions are offset inwardly into the chamber that is defined by the box, but are connected to the box wall each is associated with by an integral frangible marginal portion of film thickness proportions, which form a frangible marginal portion about the corner segment that is continuous and uninterrupted. The knockout formed by the corner segment can be removed by applying a screw driver or the like against same from either the inside or the outside of the box to push the corner segment out of its position in the box to define the knockout opening that is to receive a cable end to be inserted in the box.
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