Patent ID: 7243462

Claim:
An access door comprising: a rectangular outer frame adapted to be set in a wall and having two longitudinal sides and two transverse sides defining four corners; a rectangular inner frame congruent to the outer frame, having longitudinal and transverse sides and four corners, and dimensioned to fit within the outer frame; hinge means at two corners at ends of one of the longitudinal sides for holding the inner frame in the outer frame and for pivoting of the inner frame in the outer frame generally about the one longitudinal side; and two transversely effective spring latches at the other longitudinal side near ends thereof between the inner and outer frames; and two longitudinally effective spring latches at the transverse sides near the other longitudinal side between the inner and outer frames, each of the spring latches being provided with: a keeper tongue on the inner frame, and a spring on the outer frame engageable over the respective tongue, the springs of the longitudinal latches having bent-out ends bearing inward on the inner frame.