Patent ID: 7299590

Claim:
An apparatus for setting and maintaining the dimensions of a door frame having opposing first and second sidewalls each having a doorstop mounted thereupon, comprising; a first head plate including a first facing edge for engagement with a first sidewall of a door frame, said first facing edge having a notch located therein for admitting a first doorstop mounted on the first sidewall of the door frame: a first arm connected to said first head plate at a side opposite said first facing edge; a second head plate including a second facing edge for engagement with a second sidewall of the door frame, said second facing edge having a notch located therein for admitting a second doorstop mounted on the second sidewall of the door frame: a second arm connected to said second head plate at a side opposite said second facing edge, said second arm being adjustably engageable with said first arm, one of said first arm and said second arm including a plurality of indexing apertures located at uniformly longitudinally spaced-apart positions on said one of said first arm and said second arm; and an adjustment mechanism associated with the other of said first arm and said second arm, said adjustment mechanism comprising at least one retractably engageable member for selectively releasable engagement with a selected one of said plurality of uniformly longitudinally spaced-apart indexing apertures to lock said first arm in a corresponding one of a plurality of discrete uniformly longitudinally spaced-apart positions relative to said second arm to thereby establish the distance between said first and second facing edges, wherein said plurality of discrete uniformly longitudinally spaced-apart positions allowing said apparatus to be used to facilitate the installation of door frames to accommodate doors having one of a plurality of standard widths.