Abstract: A structural framework includes two frame members each having one or more channels, and one or more lock devices each having two mating member fitted and engaged into the channel of one of the frame members, and a lock nut engaged into the channel of the other frame member. Each of the mating members includes a semi-cylindrical recess to form into a bore for the lock device. A fastener is engaged in the recesses of the mating members, and threaded with the lock nut, to secure the mating members of the lock device and thus the frame member together. The frame members may each include one or more juts for engaging with teeth extended from the mating members or the lock nut.

Abstract: A sliding door includes a track having a longitudinal channel to slidably receive a carrier, a door panel secured to the carrier, a bracket attached to one end of the track and having a pathway and a pulley, and a recovering device having a cable. The cable has one end secured to the track, and a middle portion slidably engaged through the pathway of the bracket, and the other end secured to the carrier. The door panel and the carrier are movable along the track against the cable, and the cable is engageable around the pulley of the bracket, to recover and to force the door panel and the carrier backward toward the end portion of the track when the door panel is released. One or more spring members may be engaged in the cable.