Linear adjustable telescopic nipple

Claim 1

In a telescopic nipple for connection between a pair of electrical junction boxes, said nipple having: an outer tubular member with a longitudinal slot therein which is open at one end of said outer member, said outer member having an attachment portion at its opposite end for connection to a first electrical junction box; and an inner tubular member slidably received inside said outer member, said inner member extending beyond said one end of the outer member and terminating thereat in an attachment portion for connection to a second electrical junction box; the improvement wherein said inner member has a radially outwardly-projecting boss thereon which is slidably received snugly in said slot in the outer member and is elongated lengthwise of said slot to prevent relative rotation between said outer and inner members while permitting relative longitudinal adjustment between them; and further comprising a screw-threaded member mounted in said boss and extending radially outward therefrom through said slot, said screw-threaded member carrying an enlargement on its outer end which extends transversely across said slot and is engageable with said outer member on opposite sides of said slot when turned down to lock the outer and inner members against longitudinal displacement relative to one another.