Self locking door retarder and hinge

摘要: A door and hinge mechanism particularly adapted for use in a conical hopper where the may be on down side of hopper. The pin connecting fixed element with movable is placed under tension by springs such as Belville washers so that not freely rotatably hinged element. includes cam member which rotates about an off-set axis until surface engages to prohibit further free rotation hinge. force must then applied supplementing gravity rotate relative thereby open door.