each include a flat bottom 112 and a tapered upper surface 114 as shown in fig6 the surfaces 114 taper both forwardly from the associated pin 106 and inwardly from the corresponding walls 52 and 54 the plates 108 are substantially heavier than the associated levers 110 so as to normally reside in the position illustrated in fig3 due to the influence of gravity the gates 102 and 104 are pivotal on pins 106 between a first position wherein the bottom portions 112 are disposed against the bottom of the bucket 22 and a second position wherein the plates 108 extend forwardly and upwardly of the pivot axes defined by pins 106 movement of the gates 102 and 104 from the first position to the second position is effected by the abutment of levers 110 against the undersurface 118 of the arms 12 when the arms are moving toward an elevated position as shown in fig4 tilting of the bucket to a dumping position will cause the gates to move fully to their second position as shown in fig4 the gates 102 and 104 serve to narrow the effective dumping width of the bucket 22 when the gates are in their second position material positioned between the gates and the rear wall 56 will slide inwardly from the side walls 52 and 54 due to the inward taper of.