Apparatus for applying joint compound to corner beads

An apparatus for applying joint compound to concave and convex surfaces of a corner bead, the apparatus comprising:

• first and second sidewalls attached together so as to extend transversely to one another;
• front and rear end walls attached to said first and second sidewalls so as to form together with said sidewalls a chamber for receiving a quantity of joint compound;
• first and second openings adjacent said first and second end walls, respectively, and coupled with said chamber, said first and second openings being sized to receive a corner bead;
• adjustment means for closing off a selected portion of said first and second openings;
• a first concave, elongate channel having a first cross sectional configuration, said first channel being coupled with the interior of said chamber, said first and second openings each being aligned and in communication with said first channel in order for the corner bead to be inserted through said first opening, moved along said first channel, and withdrawn from second opening;
• and,
• an insert member having a second concave, elongate channel, the second channel having a second cross sectional configuration, said insert member being sized and configured for receipt in said first channel in order for said second channel to be positioned in said first channel so as to extend along said first channel.