초록 ▼

An access door is constituted by an outer framework adapted to be fitted in a rough opening formed in a building ceiling, wall, or the like, an inner framework set in an opening in the outer framework, a cover plate secured to the inner framework so as to close an opening in the inner framework, a p

An access door is constituted by an outer framework adapted to be fitted in a rough opening formed in a building ceiling, wall, or the like, an inner framework set in an opening in the outer framework, a cover plate secured to the inner framework so as to close an opening in the inner framework, a pair of bearings and axis for pivotally connecting the inner framework to the outer framework, and a locking means for locking the inner framework to the outer framework when the inner framework closes the opening in the outer framework. The bearings are projected on one framework of the opposite inner surfaces of the outer framework and the opposite outer surfaces of the inner framework, and have U-shaped bearing surfaces. The axis are projected on another framework of the opposite inner surfaces of the outer surfaces of the inner framework, and pivotally supported to the bearings, respectively.

대표청구항 ▼

An access door comprising: an outer framework adapted to be fitted in a rough opening formed in a building ceiling, wall, or the like, said outer framework including four outer framework elements positioned in square so as to define four first corners, said four outer framework elements having first

An access door comprising: an outer framework adapted to be fitted in a rough opening formed in a building ceiling, wall, or the like, said outer framework including four outer framework elements positioned in square so as to define four first corners, said four outer framework elements having first upper and lower inserting grooves at opposite ends thereof at the outer sides of each of said four first corners, and four outer framework corner members respectively disposed in said first upper and lower inserting grooves at said four first corners so as to hold said four outer framework elements in abutting relation at said four first corners; an inner framework set in an opening in the outer framework, said inner framework including four inner framework elements positioned in square so as to define four second corners, said four inner framework elements having second upper and lower inserting grooves at opposite ends thereof at the outer sides of each of said four second corners, and four inner framework corner members respectively disposed in said second upper and lower inserting grooves at said four second corners so as to hold said four inner framework elements in abutting relation at said four second corners; a cover plate secured to the inner framework so as to close the opening in the inner framework; a pair of bearings on one of the opposed inner surfaces of the outer framework and outer surfaces of the inner framework, said bearings having U-shaped grooves, respectively; a pair of bearing pins projecting from the other of the opposed inner surfaces of the outer framework and the outer surfaces of the inner framework, and pivotally supported in the bearings, respectively; and a locking means including a box extending through and secured to the cover plate, a shaft supporting bracket, a shaft fitted in the box and rotatably supported on the inner framework by the shaft supporting bracket, said shaft being operable from the outside of the cover plate, and locking bars pivotally connected to the shaft so as to be movable into and out of the outer framework upon the rotation of the shaft.