Abstract 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* 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.
Inventors
👤 Jerry D Gordon
Bibliographic Details
Application Number—
JurisdictionUS
Data Sourcegoogle_patents
Last Synchronized2026-11-06 11:47
CPC Classifications
F; F16; F16J; F16J13/00; F16J13/02; F16J13/04
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
323 words
An access door for a rectangular opening in the cylindrical wall of a cylindrical member comprising a substantially rectangular and curved plate having substantially the same curvature as that of the cylindrical wall and having a size somewhat larger than the opening in the rectangular wall, said curved rectangular plate being further defined by a pair of spaced and straight end edges parallel to the axis of the cylindrical member and a pair of curved side edges spaced from each other and lying in planes normal to the central axis of the cylindrical member, a curved and resilient locking band radially slidably mounted against the concave face of said curved rectangular plate and being disposed generally parallel to the curved side edges of said locking plate, said curved locking band having a length substantially equal to the distance between the end edges of said plate, a substantially radial rod connected to the center of said locking band and passing through a hole adjacent the center of said plate, a handle mounted on the outer end of said rod adjacent the convex surface of said plate, said handle being mounted on said rod by means of a set pin passing through suitable holes in said handle and said rod, said handle having a cam member adapted to bear against the convex surface of said plate, said holes being mounted eccentrically in said cam member, a gasket surrounding the edges of said curved rectangular plate and adapteD to be positioned between said plate and said cylinder when said plate is in position, a pair of stiffening braces secured to the concave surface of said plate and being spaced from each other, said stiffening braces being substantially chordal with respect to the central axis of said cylindrical member and a pair of positioning lugs projecting radially inward towards the central axis of said cylindrical member and being located adjacent one edge of said curved rectangular plate.
Claim 2
Dependent Claim
323 words
An access door for a rectangular opening in the cylindrical wall of a cylindrical member comprising a substantially rectangular and curved plate having substantially the same curvature as that of the cylindrical wall and having a size somewhat larger than the opening in the rectangular wall, said curved rectangular plate being further defined by a pair of spaced and straight end edges parallel to the axis of the cylindrical member and a pair of curved side edges spaced from each other and lying in planes normal to the central axis of the cylindrical member, a curved and resilient locking band radially slidably mounted against the concave face of said curved rectangular plate and being disposed generally parallel to the curved side edges of said locking plate, said curved locking band having a length substantially equal to the distance between the end edges of said plate, a substantially radial rod connected to the center of said locking band and passing through a hole adjacent the center of said plate, a handle mounted on the outer end of said rod adjacent the convex surface of said plate, said handle being mounted on said rod by means of a set pin passing through suitable holes in said handle and said rod, said handle having a cam member adapted to bear against the convex surface of said plate, said holes being mounted eccentrically in said cam member, a gasket surrounding the edges of said curved rectangular plate and adapteD to be positioned between said plate and said cylinder when said plate is in position, a pair of stiffening braces secured to the concave surface of said plate and being spaced from each other, said stiffening braces being substantially chordal with respect to the central axis of said cylindrical member and a pair of positioning lugs projecting radially inward towards the central axis of said cylindrical member and being located adjacent one edge of said curved rectangular plate.
Claim 3
Dependent Claim
48 words
An access door for a cylindrical member as set forth in claim 1 wherein the rod is substantially rectangular in cross section and wherein the central hole in said curved rectangular plate is square and of substantially the same size as the cross sectional size of said rod.