Abstract: The preferred embodiment utilizes a key-shaped tenon on a rail that is designed to enter the lock-shaped mortise hole of the stile at the top or bottom of the stile. The key-shaped tenon slides into the top or bottom of the mortise holes of the stiles (i.e. the tenons on the top rail slide into the top of the mortise holes on the top of the left and right stiles while the tenons of the bottom rail slide into the bottom of the mortise holes on the bottom of the left and right stiles). A protrusion on the end of each of the key-shaped tenons of the rails permits it to lodge underneath a lip within each of the lock-shaped mortise holes. This interaction between the protrusion of the tenon and lip of the mortise hole prevents the rail from being removed from or disengaged from the stile in any direction other than the direction of entry.

Abstract: The preferred embodiment utilizes a wood insert panel with notches at the top and center and at the bottom and center and a wood frame with protrusions that correspond with the notches and that are located in the center of the rails of the wood frame. The interlocking of the notches and protrusions permit for expansion of the wood insert panel within the grooves in the stiles of the wood frame while still centering and supporting the wood insert panel within the wood frame.

Abstract: The preferred embodiment utilizes a wood insert panel with notches at the top and center and at the bottom and center and a wood frame with protrusions that correspond with the notches and that are located in the center of the rails of the wood frame. The interlocking of the notches and protrusions permit for expansion of the wood insert panel within the grooves in the stiles of the wood frame while still centering and supporting the wood insert panel within the wood frame.