ADJUSTABLE BAR SCREEN Russian patent published in 1998 - IPC

FIELD: screening of loose materials such as, for instance, chips or refuse. SUBSTANCE: bar screen of one of the variants has the first and second frames of parallel alternating bars put in oscillatory motion. Parts at least of some bars of the first frame extend overstepping the limits of bars of the second frame forming the middle bar, having the width of the screening gap exceeding the gap between the bars of the first and second frames. The extending parts of the bars are positioned at an angle of 10 to 30 deg. to the plane of the bars of the second frame. The other variant of the bar screen is featured by fastening of the bars, the fastening member is attached to the part performing the oscillatory motion and has two lateral vertical walls connected through a sharpened roof to two inclines passing upwards between the bar posts. The fastening member may be made with a bracket for adjustment of its position relative to the part performing the oscillatory motion. Besides, the fastening member of the screen bars may be made in the form of a clamping vertical plate with a guide groove positioned across the bars, and the parts of the bar posts in this case have a lug for installation of bars in the required position by means of engagement with the guide groove. It may be a key groove, and the bar posts may have keys for engagement with the guide groove. EFFECT: improved design. 15 cl, 7 dwg