Abstract: A crusher having (a) a crusher frame, (b) a crusher rotor with teeth supported on the crusher frame, (c) counter-blade structures within the crusher frame; and (c) upper and lower hatches. The crusher rotor and the counter-blade structures are configured within the crusher so that material fed into the crusher frame can be crushed between the crusher teeth and the counter-blade structures. The upper and lower hatches are hinged to the crusher so that the hatches can be separated to provide an opening through which foreign material may be removed from the crusher while preventing material feeding into the crusher rotor from flowing out of the crusher.

Abstract: The invention relates to a crusher for crushing solid material, the crusher comprising a frame; at least one crusher rotor arranged rotatably to the frame and having crusher blades secured to the circumference thereof; a yielding counterblade structure arranged for cooperation with the crusher blades of the rotor for concurrently crushing and cutting said material and for yielding when encountering non-crushable material and when overloaded; and a yielding and downwardly openable set of screens below the crusher rotor, whereby the counterblade structure is linked to the frame of the set of screens and made turnable towards it with respect for the pivoting shaft in a yield situation; and the set of screens is linked to the crusher frame on the opposite side of the crusher rotor with respect to the counterblade structure and its pivoting shaft and made downwardly collapsible about the pivoting shaft of the set of screens.

Abstract: A blade bit for attachment to a chuck in an envelope surface of a crusher rotor. The blade bit (1) having four corners and being arranged for being attached to the chuck such that an angular-shaped tip of the blade bit points outwardly from the envelope surface, substantially in the radial direction of the rotor. A rear surface of the blade bit acts as an attachment surface to the chuck and includes a support surface (9) preventing the blade bit from rotating. The support surface also enables sliding of the blade bit towards the envelope surface (3), when the blade bit is being attached, until the blade bit is supported to the envelope surface.

Abstract: A crusher comprising a box-like crusher frame with two end walls and two side walls connecting the end walls; at least one crusher rotor that is supported for a rotating movement inside the crusher frame against its end walls; the circumference of the crusher rotor having a plurality of crusher teeth and the crusher having counter-blade structures arranged to cooperate with the crusher teeth of the crusher rotor, and the material fed into the crusher for crushing being intended to be fed essentially above the centre line of the rotor(s) and to be crushed between the crusher teeth of the crusher rotor and the counter-blade structures; wherein two hatches are arranged on at least one side wall side of the crusher, the first hatch being above the centre line of the crusher rotor and pivoted at its top part to the crusher to be turnable toward the centre line of the crusher, and the second hatch being mainly below the centre line of the crusher rotor and movable away from the front of the crusher rotor.

Abstract: The invention relates to a crusher for crushing solid material the crusher comprising a frame; at least one crusher rotor arranged rotatably to the frame and having crusher blades secured to the circumference thereof a yielding counterblade structure arranged for cooperation with the crusher blades of the rotor for concurrently crushing and cutting said material and for yielding when encountering non-crushable material and when overloaded and a yielding and downwardly openable set of screens below the crusher rotor, whereby the counterblade structure is linked to the frame of the set of screens and made turnable towards it with respect for the pivoting shaft in a yield situation; and the set of screens is linked to the crusher frame on the opposite side of the crusher rotor with respect to the counterblade structure and its pivoting shaft and made downwardly collapsible about the pivoting shaft of the set of screens.

Abstract: The invention relates to a blade bit to be attached to a chuck in an envelope surface of a crusher rotor, the blade bit (1) having four corners and arranged for being attached to the chuck such that an angular-shaped tip of the blade bit points outwardly from the envelope surface, substantially in the radial direction of the rotor, whereby the rear surface of the blade bit, which acts as its attachment surface to the chuck, comprises a support surface (9) preventing the blade bit from rotating, which support surface also enables sliding of the blade bit towards the envelope surface (3), when the blade bit is being attached, until the blade bit is supported to the envelope surface.