Electrical wiring box

A box arrangement comprising

• a box including a plurality of walls arranged to define a space for receiving a device, said box having first and second longitudinal openings therein in which first and second mounting elements are disposed, respectively, and further having first and second pairs of abutment portions adjacent to opposite sides of the first and second openings, respectively;
• each of said first and second mounting elements comprising
• a central portion adjacent to the front of the corresponding opening in the box and having a portion in abutment with a portion of the box adjacent to the opening, said central portion having an opening therethrough by which a threaded screw may be inserted and pushed longitudinally into the mounting element, said opening being of a size to permit the threaded portion of a screw to be freely and readily inserted into the mounting element and to be pushed into the mounting element without the central portion interfering with the forward movement of the screw or gripping onto the threaded portion of the screw;
• first and second spaced-apart side portions connected with the central portion on opposite sides of the opening in the central portion and extending along the corresponding opening in the box;
• and
• first and second deflective sections connected with the first and second side portions, respectively, and adjacent to the abutment portions of the box, said first and second deflective sections including first and second retention portions attached to the first and second side portions, respectively, and angled outwardly in opposite directions from the axis of the opening in the box, said first and second deflective sections including first and second thread-engaging portions attached to the first and second retention portions, respectively, and angled inwardly toward the axis of the opening in the box with each thread-engaging portion extending in a direction toward the other thread-engaging portion;
• each of said thread-engaging portions having a single thread-engaging surface, the two thread-engaging surfaces being spaced apart and defining a screw receiving region therebetween, said two thread-engaging surfaces being substantially parallel and each being at an angle with respect to a reference line lying perpendicular to the direction the thread-engaging portions extend, said thread-engaging portions being in the path of a screw pushed into the mounting element whereby the screw contacts the single thread-engaging surface of each thread-engaging portion;
• said retention portions initially extending outwardly beyond the sides of the corresponding opening and positioned adjacent to the abutment portions of the corresponding pair of abutment portions of the box for retaining the mounting element within the opening, and subsequently operative when a screw is inserted and pushed into the screw-receiving region and forced between the two thread-engaging surfaces to be deflected outwardly further in opposite directions away from the axis of the corresponding opening in the box and to be positioned with respect to the abutment portions of the corresponding pair of abutment portions so as to further retain the mounting element in position in the corresponding opening in the box and prevent removal of the mounting element from the opening;
• and
• the two thread-engaging surfaces being operative as a screw is pushed into the screw-receiving region to ride along the threads of the screw without impeding the forward movement of the screw so as to prevent withdrawal of the screw from the mounting element except by unthreading the screw from engagement with the thread-engaging surfaces.