Movable grate for a furnace

A movable grate for a furnace including a number of grate lanes arranged side-by-side between a left side section and a right side section, neighboring grate lanes being connected by means of a midsection, each grate lane including at least one lane section having a number of pivotal grate shafts carrying grate bars and thereby defining an inclined grate surface of said lane section, each midsection including an upper relatively narrow housing section arranged between grate bars of the corresponding neighboring grate lanes and a lower relatively broad housing section protruding at least partly wider grate bars of said corresponding neighbouring grate lanes, each grate shaft having a driven grate shaft end and a non-driven grate shaft end, each grate shaft end being journaled in a respective bearing, the left and right side sections enclosing bearings for corresponding grate shaft ends of the left and right outermost grate lanes, respectively, and the upper relatively narrow housing section, of each midsection enclosing bearings for corresponding grate shaft ends of corresponding neighbouring grate lanes, each lane section being provided with a drive mechanism including an actuator for pivoting back and forth neighboring grate shafts in opposite rotational directions so as to impart a wave-like movement to material on the grate surface in order to transport such material downwards, a synchronising mechanism being arranged to maintain a predetermined clearance between edge portions of grate bars of neighbouring grate shafts, wherein at least one midsection includes the drive mechanism and the synchronising mechanism of at least one lane section, and in that the actuator of said drive mechanism and said synchronising mechanism are located in the lower relatively broad housing section of said at least one midsection.