fig3 or brought forwardly into close proximity to dipper boom 14 as shown in fig4 the absence of this linkage would preclude arcuate movement of bucket 12 beyond a point at which piston rod 18 otherwise would strike dipper boom 14 specific attention is directed to the operating characteristics of this linkage since the novel clamping apparatus 50 of this invention is designed to replace link plates 24 and 25 with a cantilever 50 as will be described more fully hereinafter it is important to understand this movement of this linkage in order to recognize the unique feature of this invention namely that the clamping action of this invention is accomplished in a direction reverse to the action of all other prior art devices conventional hydraulically actuated clamping equipment not shown entails the use of a separate hydraulic piston designed to move a jaw toward the bucket to create the clamping action numerous devices are available in various configurations with each configuration including jaws fingers claws or the like which are provided with a relative motion toward the other component that is one jaw etc moving toward the other with the third object clamped therebetween referring now to fig5 the clamping apparatus of this invention is shown as a cantilever 50 and includes a pair of spaced link plates 54 and 55 with lever arms 52 and 53 respectively formed as extensions.