Step type stoker with oscillation mechanism

A step type stoker with an oscillating mechanism comprising:

• a plurality of stoker frames which are installed at fixed intervals in an upstream to downstream direction, and at least one of which is tubularly-shaped to form an air supply path;
• movable fire grates each of which is formed of a plurality of fire-grate members installed in a step-like manner on a groove-shaped frame, said groove-shaped frame being equipped with an air path which is in communication with the air supply path in the aforementioned tubularly-shaped stoker frame at all times, said groove-shaped frame being supported by, but reciprocating on, the aforementioned stoker frames;
• and
• fixed fire grates each of which is formed with a plurality of fire grate members installed in a step-like manner on a groove-shaped frame equipped with an air path which is in communication with the air supply path in the aforementioned stoker frame at all times, each said fixed fire grate being arranged to be adjacent to and parallel with the aforementioned movable fire grate, and being fixed on each of the aforementioned stoker frames;
• wherein is further included at least one sliding box which is fixed to the underside of the groove-shaped frame of a movable grate which rides on an upper surface of a turbularly-shaped stoker frame, the air supply path in the stoker frame and the air supply path in the groove-shaped frame being in communication by means of a communicating path passing through said at least one sliding box.