Abstract: A chain master link has first and second link parts having outer ends centered on respective substantially parallel first and second axes and coupled-together inner ends. Each inner end is formed with at least one tooth extending transversely across a plane including the two axes and having an inner face turned toward the respective axis and forming with the plane an angle of at least 90° open away from the respective axis. The teeth are engaged together with the inner faces bearing on each other so that tension pulling the parts apart along the plane pulls the teeth into engagement with each other. Each part is formed with a pocket receiving the tooth of the other part and having an outer face forming with the plane an angle open away from the respective axis and greater than the respective inner-face angle. Thus the two parts can be fitted together simply by pivoting their inner ends toward each other about the respective outer-end axes.

Abstract: A track system for a track vehicle which has a crawler chain and a driving sprocket wheel. The chain has links each of which has a pin assembly with a bushing or one piece bolt the outer periphery of which at least is composed of a material consisting of Si.sub.3 N.sub.4 silicon nitride or a zirconium oxide with at most 15% of sintering additives. The driving sprocket wheel can have segments formed with the teeth and bolted to a disk, the segments being composed of a material consisting of Si.sub.3 N.sub.4 silicon nitride or zirconium oxide with less than 15% of sintering additives.

Abstract: A spreading unit which may be used for the spreading of particles for the production of thin pressed board or as a cover layer or face layer for a multilayer pressed board in conjunction with other spreading units along a belt upon which a mat of the mixture of particles and glue is to be formed. The spreading unit has a bunker and a discharge system for discharging a raw material stream in free-fall which is intercepted by an air classifier spreading the particles onto the belt in parabolic paths. In a region directly below the raw-material discharge and over a portion of the parabolic paths, a ball-collecting unit, for example a disk grate, is provided to intercept the balls while allowing the particles to pass without altering their classification. Fine particles of the parabolic paths beyond the ball catcher pass directly onto the belt.

Abstract: A particleboard press for converting a thick mat into a thin panel has a frame, an upper beam and a lower beam carried on the frame and vertically confronting each another, respective upper and lower platens carried on the beams and vertically confronting each other, and respective upper and lower belts having stretches engaged under and over the upper and lower platens, respectively. The belts are synchronously driven so as to advance a mat in a transport direction through the press between the platens. One of the beams is vertically displaceable on the frame relative to the other beam and its platen has relative to the direction a downstream calibration portion and an upstream compression portion at least limitedly vertically displaceable relative to the one beam and the downstream calibration portion.

Abstract: A belt-type press for making particleboard has a longitudinal row of transverse frames through which pass upper and lower longitudinally extending press beams extending along and carried on the row of frames flanking respective heated press platens in turn flanking stretches of respective upper and lower belts driven to move a mat of particles to be pressed along the path in a transport direction. The upper beam is pressed down by a plurality of substantially identical hydraulic actuators to compress the mat between the belts with a relatively high pressure in an upstream compression region of the press and with a relatively low pressure in a downstream compression region of the press. The upper platen and beam have a downstream calibration portion and an upstream compression portion, the latter being elastically deflectable upward relative.

Abstract: An apparatus for pressing and steam curing a wood-particle mat to produce a wood-particle board includes a pair of pressing belts which are arranged above each other at a distance to define a gap therebetween within which the wood-particle mat is conveyed and shaped. Along its passage through the pressing belts, the wood-particle mat is first moved along a compression zone in which the gap is gradually reduced and then passes along a sizing zone. Cooperating with the pressing is a steam injection unit which includes a steam supply channel system and a steam discharge channel system. Both channel systems border on the pressing gap and are provided with nozzle bores extending towards the gap. Via the supply channel system, steam is injected along the compression zone in direction of the wood-particle mat while the discharge channel system which extends at least along a downstream section of the sizing zone is provided to collect and eventually to discharge steam.