Belling apparatus

In apparatus for cutting a bell shaped recess in an earth formation in the lower end of a cylindrical pier bore which enters said formation from the ground surface;

• a. an upper fixed cylindrical housing in the upper portion of said pier bore,
• b. anchoring devices on said housing for holding the housing against rotation relative to the pier bore,
• c. a lower rotating housing connected to the lower end of said upper housing and extending substantially to the bottom of said pier bore, said lower housing being formed with a slot adjacent to its lower end,
• d. drive means for rotating said lower housing under power,
• e. an auger casing coaxial with said housing, spaced therefrom and extending from a point above the ground surface to a level a small distance above the bottom of the pier bore,
• f. a discharge port in said auger casing above said ground surface;
• g. an auger in said auger casing
• h. power means for rotating said auger,
• i. a collar rotatably and axially moveable on said auger casing,
• j. power means for moving said collar axially on said auger casing,
• k. a blade having its upper end pivoted to said collar in a position in which the lower portion of the blade may be swung through the slot in the rotating housing,
• l. an eccentric link having an upper end pivoted to said blade between the ends thereof and a lower end pivoted to said rotating housing whereby downward movement of said collar causes the lower portion of said blade to be swung outwardly through said slot;
• m. a feed port in the lower end of said auger casing and a feeding device on said auger casing at said feed port for feeding spoil from said slot through the feed port to the auger.