Shear-type loader for a tunnel and gallery excavator

In a loading mechanism operating on a loading apron of a tunnel and gallery excavator said loading mechanism comprising an eccentric-carrying crank disk rotatable about an axis, a crank lever, a shear rake, and a link, wherein said eccentric-carrying crank disk on said loading apron is rotatable about the axis thereof in a single direction of rotation and said crank lever is connected to an eccentric pivot of said eccentric-carrying crank disk, wherein said crank lever is pivotally connected by a lever arm unitary therewith to said link, said link being pivotally attached to said loading apron behind said eccentric-carrying crank disk with respect to the forward direction of travel of said tunnel and gallery excavator, and wherein further said shear rake is connected with said crank lever, the improvement wherein said shear rake is constructed as a bent lever with an angle between a raking arm formed thereon and a controlling arm formed thereon and at the vertex of the angle formed between said raking arm and said controlling arm said shear rake is mounted on said eccentric pivot with a vertex joint, and a first end of an operating lever is connected to said controlling arm by a first operating lever pivot joint and a second end of said operating lever is connected in the vicinity of the middle of said link by a second operating lever pivot joint.