Aircraft lavatory drain plug

Claim 1

In combination with a valve of the type attachable to an aircraft lavatory drain port, the valve being generally tubular and axially alignable with the port and having a lateral outlet integratedly formed therewith, the valve including means for engaging a port plug to move the plug into and out of engagement with the port, the improvement comprising the port plug including: a. a base plate; b. a first cam mounted on the base plate in fixed relationship therewith; c. radially expandable means connected for relative rotatable relationship with the first cam, the radially expandable means including: i. a disc portion; and ii. radial exanders pivotally mounted on the disc, each of the expanders including a radially inwardly facing peripheral surface being generally annular and having alternate curvilinear and rectilinear portions; d. radially outwardly facing peripheral surface means on the first cam being generally annular and having alternate curvilinear and rectilinear portions for cooperating engagement with the alternative curvilinear and rectilinear portions, respectively, of the expanders, and, upon relative rotating motion between the first cam and the expandable means, for pivoting the expanders radially outwardly with respect to the disc portion due to engagement of the curvilinear and rectilinear portions of the cam with the rectilinear and curvilinear portions, respectively, of the expanders; e. resilient seal means radially embracing the expanders and including an axially extended face for enclosing an airspace in axial relationship with the expanders; the resilient seal means including: i. radially facing annular means mounted on the expanders for radial expansion therewith; and ii. axially facing annular means integratedly formed with the radial facing means and maintained axially spaced from the expanders for enclosing an airspace therebetween and including a disc having at least one convolution concentric with and radially inwardly spaced from the radially facing annular means; f. radially inwardly protruding lip means on the seal means formed with the radially facing annular means for securing the resilient seal means into engagement with the radially expandable means; g. a second cam mounted on the base plate in relative rotatable relationship therewith; and h. locking means mounted on the base plate for outward slidable radial extension thereof with respect to the base plate into locking engagement with the port upon rotation of the second cam.