Means and method for attaching fan and fixture units or the like substantially flush with a ceiling

Claim 1

In a ceiling terminal which includes a largely cylindrical ceiling bowl member having a lower rim and fastened close to a ceiling, and a second largely cylindrical bowl member of about the same diameter, and with an upper rim to mate with the ceiling member by one member closely fitting within the other, and wherein the second bowl member is attached to an electrical device of larger diameter than the bowl members, so that when the bowl members mate the electrical device blocks easy access to the outside of the bowl members, the improvement wherein: one bowl member has a plurality of slots spaced about its rim, and the other bowl member has a plurality of projections that pass along said slots when said bowl members mate; each of said slots is largely U-shaped, with a first portion extending primarily vertically by at least twice its width and having an outer end forming an opening in the rim of the slotted member and an inner end spaced from its rim, a second slot portion extending primarily horizontally from said inner end of said first slot portion and said second slot portion having an inner end opposite said first slot portion, and a third slot portion extending in a largely vertical direction from said inner end of said second slot portion and having an inner end furthest from the second slot portion, whereby a workman can install the second bowl member with the electrical device thereon by pressing up the second bowl member until he senses that the projections have reached the inner end of the first slot portions, turning the second member until the projections reach the inner end of the second slot portions, and then releasing the second member to move down slightly to move the projections to the inner ends of the third slot portions.