Telescopical bar screen raking system

Abstract

Improved bar screen raking systems are provided with telescopical boom members, forming the rake arm controlling displacement up and down, in combination with a hydraulic piston rod cylinder, controlling displacement in and out. In one embodiment the raking system includes a telescopical rake arm boom comprising a boom member supporting a bearing slide and ball carrier, a cam follower and track arrangement in fixed spaced apart parallel disposition on opposing sides along the length of said boom, a boom side member connected to said bearing and cam arrangements for carrying a rake, a hydraulic piston driven cable device fixedly supported by said boom and parallel to said bearing slide and cam follower arrangements for controlling boom displacement up and down and a hydraulic piston rod cylinder device for controlling boom displacement in and out. In a second embodiment a raking system includes a telescopical rake arm boom comprising outer stationary axially disposed members, an inner axially disposed cylindrical telescopable member having a rake connected to one end and connected at the other end to an axially disposed ball screw arrangement for controlling displacement of said boom and rake up and down, and a hydraulic piston rod cylinder device for controlling boom displacement in and out.