Tool connection units for earth working machinery

Claim 1

A HYDRAULICALLY ACTUATED TOOL CONNECTED FOR USE IN POWERED EARTH WORKING AND MATERIALS HANDLING MACHINERY, SUCH AS BACKHOES, DIGGERS, GRADERS AND LOADERS, COMPRISING: (A) A BODY PORTION HAVING CONNECTION MEANS SUITABLE FOR PIVOTAL ATTACHMENT TO THE WOKING ARMS OF SUCH POWERED APPARATUS AND PROVIDING AT LEAST TWO PIVOTAL CONNECTION POINTS WITH AXES OF ROTATION THAT ARE SEPARATED BUT PARALLEL; (B) A MAIN SHAFT ROTATABLY HOUSED IN SAID BODY PORTION WITH AN AXIS OF ROTATION SUBSTANTIALLY PERPENDICULAR TO SAID SEPARATE, PARALLEL AXES OF ROTATION; (C) A HEAVY PLATE MEMBER MOUNTED ON SAID MAIN SHAFT SO AS TO ROTATE INTEGRALLY THEREWITH WHILE CARRYING THE WORKING TOOL OF SAID POWERED MACHINERY; (D) A REVERSIBLY ROTATABLE, HYDRAULICALLY DRIVEN MOTOR MOUNTED ON SAID BODY PORTION AND HAVING POSITIVE DRIVE MEANS TO SAID ROTATABLE SHAFT AND PLATE MEMBER; AND (E) MEANS COORDINATED WITH SAID HYDRAULICALLY DRIVE MOTOR SO THAT ROTATION OF SAID SHAFT AND PLATE MEMBER IS INHERENTLY PREVENTED HOWEVER SAID HYDRAULIC MOTOR IS NOT BEING DRIVEN, THEREBY PREVENTING UNCONTROLLED VARIATIONS IN THE POSITION OF THE WORKING TOOL DURING ACTUAL OPERATION OF THE MACHINERY, SAID MEANS COMPRISING A CONCENTRIC ELEMENT ON EACH OF SAID PLATE MEMBER AND SAID MAIN BODY, SAID ELEMENTS HAVING DIRECTLY OPPOSED INTERMESHING RIBS FOR POSITIVE LOCKING TOGETHER WHEN SAID MOTOR IS NOT DRIVE BUT WHICH RIBS ARE SEPARABLE WHEN SAID MOTOR IS DRIVEN.