Patent ID: 8523467

Claim:
A mastic applicator, comprising: a mastic flat box applicator housing that has a lateral length from side-to-side greater than its height or width, and includes at least two side walls integrally formed including; an elongated front side wall; an elongated angled bottom side wall connected to the front side wall at a first end; a left side wall connected to the front side wall and bottom side wall; a right side wall opposite the left side wall and connected to the front side wall and bottom side wall; and a single flat elongated straight back plate opposite the front side wall and connected to a second end of the bottom side wall at a bottom edge so as to form an approximately perpendicular corner or angle, the single flat straight back plate having a relatively short width or height compared to the height of the various side walls from where it is connected at the bottom edge to the bottom side wall; a movable plate disposed in an opening of the housing and abutting at one of its ends the corner or angle formed between the bottom side wall and the back plate as a pivot point and pivoting therein, without being fixedly attached thereto, so as to permit rotational movement of the movable plate about an axis in the corner or angle location; wherein one of the side walls includes an exit hole through which mastic exits the housing responsive to movement of the movable plate, and the back plate is a single flat plate having a width dimension that allows the movable plate to open sufficiently wide with respect to the housing to allow residual mastic or mud to be removed from the inside of the housing without the need for removing the movable plate or any side wall.