Wood trim system

Wood trim apparatus, in combination with a framed opening in a wall, the wood trim apparatus being suitable for fitment to the wall around the framed opening, wherein:

• the combination includes a frame-piece, which is marginally contiguous with the framed opening;
• the frame-piece has a plane surface, which is at least approximately co-planar with the flat plane surface of the wall;
• the apparatus includes a piece of trim, of solid wood;
• the wood trim includes, as to its cross-sectional profile, an over-surface, which comprises all the surface of the trim that is visible when the trim is installed on the wall around the opening, and includes an under-surface, which comprises all the surface of the trim that is not visible when the trim is so installed;
• the wood trim includes two parallel grooves formed into the under-surface, being a straight-groove and an angled-groove;
• the profile of the wood trim is such that the visible over-surface meets the invisible under-surface at an angled-groove-edge near the angled-groove, and at a straight-groove-edge near the straight-groove;
• the apparatus includes a straight-spline, which, as to its cross-sectional profile, includes a foot that is structurally suitable for attachment to one of the plane surfaces, and is so configured, that, when the foot is attached to the plane surface, a leg of the straight-spline stands protruding away from the plane surface;
• the apparatus includes an angled-spline, which, as to its cross-sectional profile, includes a foot that is structurally suitable for attachment to the other of the plane surfaces, and is so configured, that, when the foot is attached to the plane surface, a leg of the angled-spline stands protruding away from the plane surface;
• the straight-groove includes a straight-wall, and the straight-groove is formed in the wood trim at such an angle that, when the wood trim is placed flat against the wall, the straight-wall of the straight-groove lies substantially at right angles to the flat plane surface of the wall;
• the angled-groove includes an angled-wall, and the angled-groove is formed in the wood trim at such an angle that, when the wood trim is placed flat against the wall, the angled-wall of the angled-groove lies at an angle, which is substantially not a right angle, to the flat plane surface of the wall;
• the straight-spline and the angled-spline are attached, one to the flat plane surface of the wall and the other to the plane surface of the frame-piece, and the spacing of the attached splines, and the shapes and angles of the protruding legs thereof, are such that contact points on the legs make forceful contact respectively with the straight-wall and the angled-wall;
• the grooves are deep enough that, and the under-surface of the wood trim is relieved enough between the said two edges that, the wood trim can fit over the splines with the said two edges in contact with the respective plane surfaces;
• the angle of the angled-wall is such that the said forceful contact between the angled-wall of the angled-groove and the leg of the angled-spline creates a force urging the angled-groove-edge of the wood trim in the direction towards the plane surface to which the angled-spline is attached.