Patent ID: 8141568

Claim:
A device for coupling a horizontal and a vertical arm of a car wash spray arch comprising: a first body comprising a threaded stem and plurality of arc-shaped detents arranged in a circle on a surface of the first portion, each of the arc-shaped detents comprising a deeper center portion; a second body comprising a surface and having an aperture through the surface for accommodating the threaded stem; a plurality of balls; a ball retainer assembly comprising a central aperture for the stem of the first body and an aperture for each of the plurality of balls; the ball retainer assembly being interposed between the first body and the second body a compression spring over the stem of the first body; and a fastener designed to bias the compression spring and the second portion towards the first portion so that the second body is permitted to rotate only as the balls rotate within the length of the arc-shaped detents in the first body.