Abstract: The present invention concerns an apparatus (1), preferably for grinding a surface, including at least one grinding unit, a screen (2, 3) and a guide member (5), where the grinding unit is a rotatable and preferably horizontally arranged grinding cylinder, which at a cylinder surface is provided with a number of preferably exchangeable grinding elements, where the screen (2, 3) entirely or partly encloses the grinding unit, and where the guide member (5) is connected with the screen (2), and where the screen includes an outer screen (2) and an inner screen (3) which are mutually movably connected, and where the inner screen (3) includes a first suction screen (11) and a second screen (12) which are mutually movably connected.

Abstract: The present invention concerns a grinding apparatus (1) including a number of grinding units (3), a number of drive units (11) and a number of screen units (2), where a number of the grinding units (3) are enclosed by at least one of the screen units (2), and where at least one the screen units (2) is arranged with a pipe connection (4) adapted for connecting one or more suction units (21), where the screen unit (2) with the pipe connection (4) is designed along a lower edge (6) with a number of spacer members (7) that are arranged adjustable and replaceable, and a number of sealing members (8) that fit tightly to an underlying surface, that the spacer members (7) establish an adjustment of spacing of the grinding units (3) relatively to an underlying surface, and that the sealing members (8) interact with the suction units (21) for forming a vacuum that holds the grinding apparatus (1) against the said surface during operation.

Abstract: The present invention concerns a grinding apparatus (1) for processing a workpiece (20), including a support arrangement (4) for a number of grinding heads (6) that each includes a grinding element (2) and a grinding motor (3) driving an associated grinding element (2), where the support arrangement (4) includes an endless conveyor means (9) for the grinding heads (6), the conveyor means (9) being driven in an annular path with at least one long side perpendicular to an underlying conveyor, by at least one moving motor (5) for establishing an epicyclic movement of the grinding elements (2) across the work piece (20) during operation.

Abstract: The present invention relates to a grinding element for mounting in a recess (41) in a surface of a cylindric drum (42) and including a retainer means (2) designed with outer sidewalls that are complementary to sidewalls of the recess (41), where a squeezing force (F) on the sidewalls of the retainer means (2) arises in a situation of use by rotation of the cylindric drum (42), where the retainer means (2) includes at least one groove (5) for securing a grinding means (1), the groove (5) extending from an outwards facing side of the retainer means (2) and inwards and forming at least one elastic, pliable flap which is disposed between the said groove (5) and at least one of the outer sidewalls wherein the grinding means (1) for accommodation in the groove (5) in the retainer means (2) comprises a mounting means (3) having a socket section (3b) with a shape complementary to the groove (5) in the retainer means (2).

Abstract: The present invention concerns a grinding wheel (1) including a circular wheel that rotates about a central axis and with a surface (2) to which edge parts of a number of sand paper items (3) are fastened, and that the surface (2) has increasing height inwards from a periphery (6) of the surface (2), and that the sand paper items (3) have approximately the same height and are mounted mainly perpendicularly to the surface (2) of the wheel and have approximately radial extension over the greater part of the radius of the surface (2).

Abstract: A cylindrical drum has at its circumferential edge a number of recesses, each adapted for accommodating a replaceable grinding element including a retainer in which is mounted a sandpaper, support brushes and/or retainer brushes. The recesses in the cylindrical drum are made with side walls. The retainer is made with corresponding outer side walls. During use, by wedge action between the side walls of the recesses and the outer side walls of the retainer, a squeezing force on the side walls of the retainer directed in the circumferential direction arises. The retainer is designed with grooves for fastening at least one sandpaper, and the grooves extend from an upper side of the retainer and into the retainer for forming at least one elastic and pliable flap which is disposed between the grooves and at least one outer side wall.

Abstract: The invention concerns a cylindric drum for a sanding/polishing tool which in its drum surface is provided with a number of undercut axial grooves for mounting one or more axially displaceable sanding elements, where an annular groove has been provided either in the drum surface or a shaft perpendicularly to the rotational axis of the cylindric drum and along the periphery of either the surface of the drum or the surface of the shaft, that a stop means has been arranged for accommodation in the annular groove in an axially fixed position, where at least a part of the stop means abuts on end faces of the moldings of the sanding elements mounted in the axial undercut grooves.