| 摘要 |
An access door for a rectangular opening in the cylindrical wall of a cylinder comprising a curved rectangular plate of somewhat larger size than the opening in the cylinder, a gasket surrounding the side edges of the rectangular plate and providing a margin of gasket material along the side edge of the plate against the cylinder; the door also includes an arcuate, but somewhat resilient, locking band of substantially the same length as the rectangular plate; a short rod projects radially outwardly from the center of the locking band and projects through a hole in the center of the curved rectangular plate; on the end of the rod which projects through the curved plate is mounted a pivotal handle which is secured to the outer end of the rod by means of a set pin, the latter being held in place by means of a locking pin; the handle has a curved or cammed portion which bears against the outer curved surface of the curved rectangular plate and the hole in the handle through which the set pin passes is eccentrically positioned with respect to the cammed surface; thus, with the handle perpendicular to the curved rectangular plate, the band is in its maximum position away from the plate; with the handle turned against the curved rectangular plate in the opposite position, substantially 90 DEG away from the position previously described, the band will be drawn to its closest position with respect to the plate; the plate is also provided with a pair of stiffening braces on the interior of the plate to prevent the latter from getting out of shape through mishandling, dropping, etc.; a pair of positioning pins or lugs are located on the interior surface of the plate adjacent the bottom edge.
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