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A molded plastic, substantially planar, plate member which, when assembled, forms an open-topped electrical outlet box. The flat plastic plate member has end walls and side walls which are all foldable along living hinges relative to a bottom wall until further movement is prevented by raised projec

A molded plastic, substantially planar, plate member which, when assembled, forms an open-topped electrical outlet box. The flat plastic plate member has end walls and side walls which are all foldable along living hinges relative to a bottom wall until further movement is prevented by raised projections to thereby form a three-dimensional box. Mounting sleeves are integrally formed in the end walls for receiving mounting nails. Flanges are also integrally formed in the end walls for receiving stamped Tinnerman-type nuts. Channels are integrally formed in the end walls and receive lateral edges of the side walls; slots in the channels receive tabs integrally formed on the lateral edges of the side walls. Additional tabs also integrally formed on the lateral edges of the side walls have U-shaped recesses therein for receiving the stem of the mounting nail with a snap-type action. Resilient flaps are integrally formed in the end walls to permit insertion of an electrical cable therethrough and into the box; the flaps clamp and retain the inserted cable in fixed position within the box.

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A substantially planar molded synthetic plastic material blank adapted for erection into an electrical outlet box of the type in which electrical devices such as switches, electrical receptacles, convenience outlets and the like are mounted, said blank comprising: (a) a substantially planar, synthet

A substantially planar molded synthetic plastic material blank adapted for erection into an electrical outlet box of the type in which electrical devices such as switches, electrical receptacles, convenience outlets and the like are mounted, said blank comprising: (a) a substantially planar, synthetic plastic material, foldable member having (i) a generally planar base panel having a pair of opposite longitudinal edges and a pair of opposite transverse edges, (ii) a first pair of generally planar side panels each having an inner edge located at and connected to a respective one of said longitudinal edges to thereby form a respective common edge therewith, (iii) a second pair of generally planar side panels each having an inner edge located at and connected to a respective one of said transverse edges to thereby form a respective common edge therewith, and (iv) each pair of said first and said second pairs of side panels extending transversely away from said longitudinal and said transverse edges, respectively, along a pair of directions which are substantially orthogonal to one another to thereby form a generally cross-shaped configuration; (b) living hinge means of one-piece with said foldable member and being located lengthwise along each of said common edges, and being operative for facilitating folding of said side panels relative to said base panel about respective axes along which each of said common edges extends between a generally flattened position in which said side panels lie generally in the same plane as the plane of said base panel, and a folded erect position in which said side panels lie in respective planes each generally orthogonal to the plane of said base panel; (c) access means of one-piece with said foldable member, and operative for facilitating insertion of an electrical cable into the interior of the electrical outlet box when said panels have been folded to said folded erect position; (d) flange means of one-piece with said foldable member, and operative for facilitating mounting of an electrical device into the interior of the electrical outlet box; (e) engaging means of one-piece with said side panels, and operative for engaging a side panel of said first pair to a side panel of said second pair when said panels have been folded to said folded erect position, said engaging means including (i) a pair of tabs each projecting from an opposite lateral edge of one of said pairs of side panels, each tab having a nail-receiving opening, and (ii) a pair of slots each immediately adjacent an opposite lateral edge of the other of said pairs of side panels, each slot being dimensioned for receiving each corresponding tab when said panels are in said folded position; and (f) means for securing the electrical outlet box in said folded position to a building structural member, and also for maintaining the structural integrity of the box in said folded position, including (i) a pair of mounting nails each being insertable through a respective nail-receiving tab opening for attachment to the building structural member to thereby fix the relative orientations of said panels in said folded position and to concomitantly prevent said panels from moving out of their relative orientations in said folded position, whereby the foldable member is folded in situ at the building structural member and the structural integrity of the folded box is maintained by the mounting nails.