GB195695A - Improvements in and relating to screening apparatus - Google Patents

Abstract

195,695. Hoyle, H. P., and Grange Iron Co., Ltd. Dec. 6, 1921. Fixed sieves; sieves with compound motion.- The screening surface a has vibratory movement imparted to it by arms t actuated by eccentrics q on a rotary shaft p. In one arrangement, Fig. 2, the screen a is held by clamping bars b, connected by links d and eye-bolts f to supports i with trunnions j which are clamped to the fixed frame so as to hold the screen in any desired position. The supports may be connected by a bar n which forms a seating for the bearings o of the shaft p. The arms t are carried by a sleeve r mounted on bearings s on the eccentric parts q, which are preferably set at an angle of 180‹ to each other. In another arrangement, Fig. 7, the screen a is connected to the supports i through levers B mounted on pivots C adjustably secured to the supports by screws D. The levers are connected in pairs on opposite sides of the screen by chains F the tension of which is adjustable. The eccentrics q are set at angle of 180‹ to each other and are in line, their common axis intersecting the axis of the intermediate portion of the shaft p at its centre as shown in. Fig. 9. The action of the arms t on the screen imparts thereto an additional cross-wise movement which is limited by the springs J.