Bar screen cleaning device

Claim 1

A SCREEN CLEANING DEVICE FOR USE IN COMBINATION WITH A SCREEN TO CATCH DEBRIS OR REFUSE IN A FLOWING LIQUID STREAM COMPRISING: GUIDE TRACK MEANS ADJACENT TO THE SCREEN TO BE CLEANED HAVING A GENERALLY STRAIGHT LOWER PORTION AND A CURVED UPPER PORTION EXTENDING OVER A DISCHARGE POINT, A RAKE ASSEMBLY MOVABLE ALONG SAID TRACK MEANS INCLUDING A RAKE MEMBER PIVOTABLE BETWEEN AN OPEN POSITION OUT OF ENGAGEMENT WITH THE SCREEN AND A CLOSED POSITION TO CLEANINGLY COOPERATE WITH THE SCREEN, MEANS FOR MOVING SAID RAKE ASSEMBLY ALONG SAID TRACK MEANS AND ACROSS THE SCREEN, PIN MEANS STATIONARILY MOUNTED ADJACENT THE CURVED PORTION OF SAID TRACK MEANS, GUIDE MEANS MOUNTED ON SAID RAKE MEMBER ENGAGEABLE WITH SAID PIN MEANS TO PREVENT SAID RAKE MEMBER FROM PIVOTING FROM SAID CLOSED POSITION TO SAID OPEN POSITION UNTIL IT IS POSITIONED OVER SAID DISCHARGE POINT, PUSHER MEANS ADJACENT THE CURVED PORTION OF SAID TRACK MEANS ENGAGEABLE WITH SAID RAKE ASSEMBLY TO INITIATE DESCENDING MOVEMENT OF SAID RAKE ASSEMBLY ALONG THE CURVED PORTION OF SAID TRACK MEANS TOWARDS THE LOWER PORTION THEREOF,