Abstract: A combined toilet and urinal has a flush tank and a toilet having a toilet bowl mounted to the flush tank and having a water input from the flush tank and a siphon outlet. The waterless urinal has a urinal bowl having a drain therein. The toilet bowl and urinal bowl are formed in one dual bowl toilet body. A drain tube connects the urinal drain to the toilet siphon outlet of the toilet bowl for draining urine from the waterless urinal and a floatable drain cover is positioned in the waterless urinal bowl to cover the drain opening in the absence of liquid in the bowl and uncovers the urinal drain opening when liquid in the urinal bowl floats the drain cover. The drain cover can be a floatable ball, such as a hollow plastic sphere, while the urinal ball is shaped to direct the free-floating bowl over the drain whenever there is no liquid in the urinal bowl. The urinal bowl has a bottom portion shaped to guide the floatable drain cover over the drain opening.

Abstract: An apparatus for moving a carriage along a roof structure of the type having a plurality of purlins spaced apart from one another in a parallel arrangement, and method of using same are disclosed. The apparatus includes a grappling member mounted for movement along the length of a first one of the plurality of purlins. The grappling member is adapted to be temporarily placed into a locked position so that the grappling member is fixed with respect to the first purlin. A tension member operatively connects the grappling member to the carriage. A pulling device is used to pull on the tension member so as to shorten the distance between the grappling member and the carriage, thereby advancing the carriage along the length of the purlins in a direction towards the grappling member when the grappling member is in the locked position.