The doctor blade (12) of a coating or glazing appts. is mounted on a girder (2). The girder (2) is supported internally by an elongated member (4) spaced by hydraulically or pneumatically loaded elongated pressure elements (5), from the outer elongated member (3). The member (3) in turn engages the girder (2) by way of strips (15). Cooling or heating fluids can be passed through ducts (27) between the strips (15).
