Tool Attachment

Abstract

A tool attachment 10 comprising a plurality of pick-up pins 32, 34 or excavator bucket pins, each for threading through a pair of spaced apart holes 26 in a mounting part 22 of the tool, a bush 40 for each hole 26, fasteners 44 for fastening each bush to a surround of the respective hole and retainers 46 for each end of each pick-up pin 32, 34, wherein each of the bushes 40 has an eccentric hole 58 there through for receiving a portion of one of the pick-up pins 32, 34 so that the spacing between the pick-up pins 32, 34 can be selected according to the axial orientation of the bushes 40 in relation to the surround 22.

I claim: 
     
         1 . A tool attachment comprising a plurality of pick-up pins or excavator bucket pins, each for threading through a pair of spaced apart holes in a mounting part of the tool, a bush for each hole, fasteners for fastening each bush to a surround of the respective hole and retainers for each end of each pick-up pin, wherein each of the bushes has an eccentric hole there through for receiving a portion of one of the pick-up pins so that the spacing between the pick-up pins can be selected according to the axial orientation of the bushes in relation to the surround. 
     
     
         2 . The tool attachment according to  claim 1 , wherein the centre of the eccentric hole is orbitally movable about an axis with axial rotation of the bush with respect to the surround. 
     
     
         3 . The tool attachment according to  claim 1 , wherein the pick-up pins are narrower than the hole in the mounting part of the tool. 
     
     
         4 . The tool attachment according to  claim 1 , wherein the pick-up pin is able to pass through the hole in the mounting part of the tool irrespective of the orientation of the bush in the hole. 
     
     
         5 . The tool attachment according to  claim 1 , further comprising a spacer for each hole, wherein the spacers are dimensioned in thickness according to the required spacing between the bushes on the same pick-up pin. 
     
     
         6 . The tool attachment according to  claim 5 , wherein each spacer is in the form of a disc. 
     
     
         7 . The tool attachment according to  claim 1 , wherein the fasteners are a set of bolts and nuts. 
     
     
         8 . The tool attachment according to  claim 1 , wherein each retainer is a bolt and a respective nut. 
     
     
         9 . The tool attachment according to  claim 1 , wherein the bushes each comprise a radially extending flange with a plurality of holes there through for receiving the fasteners. 
     
     
         10 . The tool attachment according to  claim 9 , wherein the mounting part has a set of holes for alignment with the holes of each of the bushes and for receiving the fasteners. 
     
     
         11 . The tool attachment according to  claim 1 , wherein the pick-up pin is a tube with transverses holes adjacent each end for receiving the retainers. 
     
     
         12 . The tool attachment according to  claim 1 , wherein each spacer has thickness selected according to the dimension of the surrounds of the mounting part of the tool. 
     
     
         13 . The tool attachment according to  claim 1 , wherein the spacers each comprise a plurality of holes for receiving the fasteners. 
     
     
         14 . The tool attachment according to  claim 1 , wherein the rotational orientation of the bushes is selected according to the required spacing of the pick-up pins for a given type of arm coupling. 
     
     
         15 . An excavator comprising an arm, a tool, and a tool attachment according to  claim 1 .