Base plate for concealed hinges

Claim 1

A base plate for a concealed hinge comprising a main plate portion having a longitudinal axis and a pair of projecting plate portions each having a longitudinal axis in transverse relationship to said main plate portion longitudinal axis, said pair of projecting plate portions project from opposite sides of said main plate portion thereby defining a generally T-shaped configuration to said base plate, aperture means in each of said projecting plate portions for receiving therethrough an associate screw, said aperture means each being of an oblong shape and having a major axis in transverse relationship to said main plate portion longitudinal axis, said projecting plate portions each having a plurality of teeth in general parallel relationship to each other and to said main plate portion longitudinal axis, a washer associated with each projecting plate portion and each washer having an opening, each washer beng in overlying relationship to an associated projecting plate portion, a plurality of teeth carried by each washer in meshed relationship with said first-mentioned plurality of teeth, a screw received through each aperture means and opening, cooperative guide surface means between each washer and its associated screw for accurately locating the latter elements relative to each other, each of said projecting plate portions having a pair of spaced upstanding ribs guidingly confining an associated washer for movement generally transverse to said main plate portion longitudinal axis, and each of said projecting plate portions having recess means in part defined by said pair of upstanding ribs for receiving and housing an associated washer and augmenting the guiding movement of said washers generally transversely of said main plate portion longitudinal axis.