Patent ID: 8710368

Claim:
An adjustable box extender comprising: a fixed ring having a ring mouth and attachable to an electrical box; an adjustable ring comprising: a face for mounting electrical devices; a throat opposite the face and slidable into the ring mouth of the fixed ring; a device passage through the adjustable ring allowing an electrical device to be inserted into the adjustable ring; and rear opening rectangular pockets residing above and below the device passage; adjusting screws pass through the pockets and are held by the adjustable ring with the screw head exposed on the face of the adjustable ring, neither advancing nor retreating with respect to the adjustable ring, and free to rotate with respect to the adjustable ring; and rectangular blocks slidable into and out of the pockets and between the adjustable ring and the fixed ring and having threads in the blocks threadably engagable by the adjusting screws and advance and retreat the block out of and into the pockets when the screws are turned, thereby extending the adjustable ring away from the fixed ring to adjust for dry wall thickness.