Method of designing and forming a demolition tool unit

Abstract

A multiple tool attachment system is adapted to be attached to demolition equipment. The system includes a universal body attached to the demolition equipment. A series of tools is independently attachable to the universal body. The universal body includes a guide slot extending longitudinally along the universal body. Each tool generally includes a pair of pivotable jaws adapted to be pivotably attached to the universal body with at least one linkage extending from the universal body and attachable to each jaw of the tool. A slide member is received within the guide slot, with each linkage attached to the slide member, and a piston cylinder arrangement is attached to the universal body and coupled to the slide member for moving the slide member and the jaws. The multiple tool attachment system is provided with quick change features and is designed to optimize the cutting characteristics throughout the movement cycle.

1 . A method of designing and forming a demolition tool unit having a pair of movable blades forming a jaw structure, a linkage connected to each blade, and a common hydraulic cylinder attached to each linkage for moving the blades, the method comprising the steps of: 
 A) developing a general jaw geometry which defines main geometric parameters of the general jaw structure of the demolition tool unit;    B) analyzing the jaw geometry to determine at least the working torque of general jaw structure throughout the range of motion of the blades;    C) determining the relative value of main geometric parameters of the general jaw structure which at least optimizes the working torque characteristics throughout the range of motion of the blades; and    D) forming a demolition tool unit having the main geometric parameters determined in step C).    
   
   
       2 . The method of  claim 1  wherein the main geometric parameters of the general jaw structure which are analyzed include a lever arm of each blade and a length of each linkage.  
   
   
       3 . The method of  claim 3  wherein the main geometric parameters of the general jaw structure which are analyzed further include a jaw depth of the blades, a maximum opening of the blades, a relative angular orientation of the linkages to the hydraulic cylinder and a relative angular orientation of the lever arm to the hydraulic cylinder.  
   
   
       4 . The method of  claim 3  further including the step of analyzing the cycle time of the general jaw structure.  
   
   
       5 . The method of  claim 1  wherein the maximum working torque is set near the closed position of the blades.  
   
   
       6 . The method of  claim 1  wherein the working torque increases throughout the blade movement.  
   
   
       7 . The method of  claim 1  wherein the step of determining the relative value of main geometric parameters includes varying the lengths of the linkages and of the lever arms.  
   
   
       8 . The method of  claim 1  wherein the step of determining the relative value of main geometric parameters includes varying the distance between the end of each linkage and the center line of the hydraulic cylinder.