about the central shaft 19 so that the position of the duct may be easily and selectively varied to effect the aforementioned adjustability the housing 11 is mounted on a cup or shell shaped bracket 22 via a radial ball bearing journal 23 one race of which is secured to a central hub 24 welded to the back wall 13 of the housing concentrically to the axis 19 while the other race is welded to the shell 22 also concentric to the axis 19 such a bearing which is of large diameter coupled with the large housing developes a certain degree of radial and axial play which as a result of the uneven distribution of the snow about the ejector housing produces unwanted vibration to overcome the effects of the vibration and to reduce the aforementioned play and to fix the ejector housing relative to the frame after its adjustment a peripheral coupling system is provided the coupling systems comprises an annular guide member 25 which in cross section takes the form of a right angle iron having the edge of one arm 25a welded to the back of the housing 11 adjacent to its periphery and another arm 25b extending outwardly of the housing and parallel to the back wall 13 this second arm 25b engages within a plurality of resiliently formed braking members 26 arranged equidistant from each other about the periphery preferably three of these devices arranged at 120 degrees from each other have been found most suitable as seen in fig2 although the number can be varied as desired the resilient braking devices 26 are in the nature of a clamping system comprising.