Abstract: A substantially smokeless burning system for burning waste material fuels. An elongated hollow burning chamber is supported in a generally horizontal orientation with a slight degree of upward tilt from front to rear. An elongated fuel accumulation chamber and a hydraulic hoist driven ram in the chamber are adapted to push elongated volumes of new fuel into the lower front end of the burning chamber such that already burning fuel is pushed to the rear of the chamber. This establishes a charcoal burning zone which at least partially overlies a volatile burning zone such that incomplete combustion products from the volatile burning zone pass over and through the charcoal burning zone to be substantially burned before exiting at the rear of the burning chamber. The burning chamber is formed of a plurality of pipe sections which are molded of refractory material in a concrete pipe making machine. Integral preheat and air delivery channels are formed in the walls of the burning chamber during the molding process.

Abstract: A knockdown spring unit for seating furniture has lift springs connectible to a rail of a frame of the furniture and releasably attachable to a suitable platform arrangement forming a seating surface. The platform arrangement can either be fastened directly to the frame at points opposite connection of the lift springs to the frame, or the platform arrangement can be supported entirely by the lift springs for indirect attachment to the frame. Each of the lift springs has a coil portion which terminates at a one end thereof in an eye and at the other end thereof in a stem disposed extending transversely from the turns of the coil portion and forming a hook provided with a substantially V-shaped bend the vertex of which is normally disposed adjacent the eye of the spring when the spring is in an undeflected state.