|국가/구분||United States(US) Patent 등록|
|국제특허분류(IPC7판)||H02G-003/08 H02G-003/18 B65D-006/40 B65D-006/00|
|미국특허분류(USC)||220/003.2; 220/254.1; 220/266; 220/277; 220/284; 220/661; 174/666|
|발명자 / 주소|
|출원인 / 주소|
|대리인 / 주소||
|인용정보||피인용 횟수 : 12 인용 특허 : 34|
An electrical outlet box molded of plastic material has a knockout arrangement in a box wall that is formed by inner, intermediate and outer circular grooves that are eccentrically positioned to overlap at a tangent location and define inner, intermediate and outer eccentrically positioned circular knockouts. The grooves vary in depth from a minimum depth at the tangent location to a maximum depth opposite from the tangent location. Areas of increased weakness are provided in the box wall at the bottoms of at least the inner and intermediate grooves, an...
We claim: 1. A wall having at least one knockout arrangement therein, said knockout arrangement comprising eccentrically positioned inner, outer and intermediate knockouts bounded by inner, outer and intermediate circular grooves in said wall, said grooves overlying one another at a tangent location, said grooves having a common first depth greater than zero at said tangent location and a second depth that is greater than said first depth at a location generally opposite from said tangent location. 2. The wall of claim 1 including at least one area of...