1. An unloader for bulk material, comprising: jib means; head means pivotally connected to said jib means for relative pivotal movement therebetween about a first axis; means coacting between said head means and said jib means for permitting pivotal movement of said head means relative to said jib means about said first axis within a first plane; conveyor means associated with said elevator head means; chain-bucket elevator means for lifting and transporting material and for discharging same onto said conveyor means, said elevator means including a support frame and a rotatable guide element disposed adjacent the upper end thereof and mounted for rotation relative to said head means about a second axis which is substantially perpendicular to said first axis; and means coacting between said head means and said support frame for causing pivotal movement of said elevator means about said second axis within a second plane which is substantially perpendicular to said first plane; whereby said elevator means can be swingably moved within two planes extending at substantially right angles to one another.