Electrical box

Claim 2

An electrical box adapted to receive an electrical fitting; openings formed in the box to align with openings formed in the fitting; a ground strap; threaded portions within each opening and adapted to move apart upon insertion of a screw but to grip the screw when the screw is rotated; one threaded portion being a threaded projection on the ground strap, the threaded projection on the ground strap extending into one of said openings in the box; a second threaded portion in said one of said openings being formed on a resiliently mounted member.

Claim 3

An electrical box as claimed in claim 1 in which the openings in the box are formed in projections at ends of the box.

Claim 4

An electrical box adapted to receive an electrical fitting; openings formed in the box to align with openings formed in the fitting; separate threaded portions positionable within the openings and adapted to be moved apart upon insertion of a screw but to grip the screw when the screw is rotated; the separate threaded portions being positionable with their threads opposed to each other; a ground strap; a threaded projection extending from the ground strap into the opening, the threaded portions being arranged assymmetrically to force the screw against the ground strap projection.

Claim 5

An electrical box adapted to receive an electrical fitting; openings formed in the box to align with openings formed in the fitting; separate threaded portions positionable within the openings and adapted to be moved apart upon insertion of a screw but to grip the screw when the screw is rotated; the separate threaded portions being positionable with their threads opposed to each other; a ground strap; a threaded projection extending from the ground strap into the opening, the threaded portions being arranged assymmetrically to force the screw against the ground strap projection.

Claim 6

A box as claimed in claim 3 including at least one ledge formed in the opening, a corresponding shoulder formed on the threaded member to engage the ledge to hold the threaded member within the opening.

Claim 7

An electrical box; lugs formed at the top of opposed ends of the box; an opening in each lug; opposed walls formed within the opening, one wall formed with a thread the other sloping outwardly downwardly; an insert adapted to be positioned in each opening; a threaded wall portion formed on each insert; a sloped wall formed on each insert, remote from the thread to abut the correspondingly sloped wall of an opening; a ground strap; a threaded projection on the ground strap extending into an opening to engage a screw; whereby, with the insert in position in the opening, a screw may be inserted between the insert and the one wall of the opening formed with a thread to be gripped between the threaded portions upon tightening and to engage the ground strap projection.

Claim 8

An electrical box; lugs formed at the top of opposed ends of the box; an opening in each lug; opposed walls formed within the opening, one wall formed with a thread the other sloping outwardly downwardly; an insert adapted to be positioned in each opening; a threaded wall portion formed on each insert; a sloped wall formed on each insert, remote from the thread to abut the correspondingly sloped wall of an opening; a ground strap; a threaded projection on the ground strap extending into an opening to engage a screw; whereby, with the insert in position in the opening, a screw may be inserted between the insert and the one wall of the opening formed with a thread to be gripped between the threaded portions upon tightening and to engage the ground strap projection.

Claim 9

A box as claimed in claim 5 in which the threads in each opening are arranged on opposite sides of a diameter of the opening from the ground strap projection so that the screw is forced into contact with the ground strap projection on tightening.

Claim 10

A box as claimed in claim 5 in which there is at least one ledge formed in each opening; a corresponding shoulder formed on each insert to engage the ledge to assist in retaining the insert within an opening.