with reference to the above figures , a truck for shredding - mixing fibrous products is generally designated by the reference numeral 1 and substantially comprises a container 2 in the shape of an inverted truncated cone which is arranged on a wheeled chassis 3 and contains a vertical mixing scroll , not illustrated , whose profile is conveniently arranged on an ideal conical surface . advantageously , said scroll is provided with cutting blades which are perimetrically fixed thereto . counterblades 4 are arranged at the lower part of the container 2 and are substantially constituted by disk sectors made of sheet metal , whose vertex 5 is arranged downward , is provided with a hole 5a and is pivoted , by means of a bolt pivot 6 , between the walls of a substantially parallelepipedal guiding element 7 which is fixed to the container 2 at an adapted substantially vertical slot 8 . said guiding element 7 is substantially box - like and has two opposite sides which are open at the slot 8 . above said guiding element 7 there is a laminar wing 9 which is perpendicular to the slot 8 and thus to the counterblade 4 whose perimetric shape it matches . said wing 9 is provided with aligned holes 10 for a pin 11 which is suitable for being inserted in holes 12 defined on the edge of the counterblade 4 to lock it at the required degree of insertion . the counterblade 4 is furthermore provided with an actuation handle 13 . according to the invention , an eccentric means 16 , substantially constituted by a disk - like element which is eccentrically provided with a hole 17 for a bolt pivot 15 , is laterally pivotally articulated by means of the pivot 15 to said counterblade 4 at a hole 14 thereof which is adjacent to the radial portion of the profile of said counterblade which is external to the container 2 . a angled lever - like actuation element 18 conveniently extends from the disk - like element 16 tangentially to the region of the hole 17 . when the counterblade is fully inserted in the container 2 , as seen in fig5 the lever - like actuation element 18 is arranged downward with respect to the pivoting point and the eccentric means 16 rests on the guiding element 7 but is directed toward the outside of the container 2 . in order to perform extraction with minimal effort it is sufficient to raise the lever - like element 18 and thus rotate the eccentric means 16 ; by continuing to rest on the guiding element 7 with its profile , said eccentric means gradually extracts the counterblade 4 . once the action of the device ends , extraction can be completed by means of the handle 13 . in practice it has thus been observed that the extraction device according to the invention has achieved the intended aim and objects . said device in fact makes the manual extraction of the counterblades less onerous , although it does not have to be necessarily coupled to hydraulic or at least automatic devices . it is characterized by extremely simple execution and low cost and can thus be applied both to newly manufactured trucks and , by being sold separately , to trucks already in use . in practice , the materials employed , so long as compatible with the contingent use , as well as the dimensions , may be any according to the requirements .
counterblade extracting device for extracting counterblades pivoted in slots of a wall including a disk element which is rigidly associated with a lever - like actuation element and which is arranged adjacent to the side of the counterblade and rotatably coupled thereto outside the wall .