Patent ID: 7472519

Claim:
A plastic door jamb assembly for forming a door jamb within the structural wood framing of a building for use in combination with at least one wooden door jamb portion and a metal reinforcement plate, the door jamb assembly comprising; a wooden door jamb portion defining an inward face, and a tapered nose portion; a door jamb plastic member in turn comprising, a hollow plastic extrusion having a doorway outer wall, and a concealed side; a nose channel on said concealed side which receives said tapered nose portion of the wooden door jamb portion; a metal reinforcement plate lying flat on said inward face of said wooden door jamb portion, between said structural wood framing of a building and said inward face of said wooden door jamb portion; a plate retention groove in said hollow plastic extrusion for engagement by said metal reinforcement plate; an angled junction wall on said hollow plastic extrusion extending at an angle from said nose channel overlying said tapered nose portion of said wooden door jamb portion; an angled surface on said tapered nose portion of said wooden door jamb portion; a fastener passing through said junction wall of said hollow plastic extrusion and secured into said angled surface of said tapered nose portion of said wooden door jamb portion; a rectangular attachment face extending from said junction wall, overlying said nose portion of said wooden door jamb portion; a retention hook on the metal reinforcement plate engageable in said plate retention groove when said metal reinforcement plate is sandwiched between said structural wood framing of a building and said wooden door jamb portion; a locking channel formed in said wooden door jamb portion; a hook extension formed on said rectangular attachment face, for interengagement in said locking channel; a reduced thickness portion on the wooden door jamb portion, which is adapted to receive the metal reinforcement plate, and permit said metal reinforcement plate to lie flat against said wooden door jamb portion, with said metal reinforcement plate overlying said hook extension; whereby the plastic door jamb member is interengaged with the wooden door jamb member, and with the metal reinforcement plate lying flat against said wooden door jamb member.