Granted Patent B1

US 6,945,304 · App. 10/406,527 · Granted Sep 20, 2005

Assignee: TMI Incorporated

Abstract

Claims (26)

1. A single-piece molded plastic hanger for use in a strip door system for providing a barrier in a vertical plane of an opening, said hanger for supporting vertically hanging flexible plastic strips, each strip having a row of uniformly spaced apertures along an upper end portion, said single-piece molded plastic hanger comprising

an elongated backing-plate portion for attaching said hanger to a header of the opening, said backing-plate portion having a plurality of means for supporting said vertically hanging plastic strips,

an elongated cover portion, for retaining said strips on said supporting means when in a closed condition, and

an elongated continuous hinge portion connecting a longitudinal edge of said backing-plate portion and a longitudinal edge of said cover portion to enable movement of the cover portion to an opened and the closed condition, wherein

a plurality of said supporting means engage said cover portion when rotated to the closed condition, to maintain said cover portion in said closed condition, and

said means for supporting said plastic strips include a plurality of protruding supporting studs and a plurality of protruding locking studs arranged along a longitudinal axis of said backing-plate portion, said supporting studs and said locking studs having a spacing corresponding to the spacing of said uniformly spaced apertures of said flexible plastic strips, said locking studs engaging said cover portion to maintain said cover portion in said closed condition.

2. The single-piece molded plastic hanger as defined in claim 1 , wherein said hanger is molded of polypropylene.

3. The single-piece molded plastic hanger as defined in claim 2 , wherein said hinge portion includes a thin web at which a hinging action occurs, and said thin web is of a thickness between 5 and 10 mills and extends across a hinging axis for a width of between 10 and 15 mils.

4. The single-piece molded plastic hanger as defined in claim 1 , wherein said backing-plate portion has therein countersunk apertures for mounting said hanger to a header of said opening.

5. The single-piece molded plastic hanger as defined in claim 1 , wherein

said supporting studs are of a cylindrical configuration and are slidingly received by mating receiving recesses in an inner face of said cover portion when said cover portion is rotated to the closed condition,

said locking studs are of a cylindrical configuration with an enlarged head portion, and are slidingly received by receiving apertures in said cover portion, and

said cover is restrained in said closed condition by overlapping of a portion of said head portion on said cover portion.

6. The single-piece molded plastic hanger defined in claim 5 , wherein

said receiving aperture is of a truncated conical shape having a larger diameter end facing said backing-plate portion when in a closed condition and a smaller diameter end,

said locking stud defines a slot of selected width extending along a central axis of said locking stud which is void of material,

said head portion of said locking stud is of an oval shape in cross-section, having a minor axis, and a major axis being substantially equal to said larger diameter of said truncated cone,

said cylindrical portion diameter of said locking stud is substantially equal to said truncated cone smaller diameter, wherein when said locking stud is inserted into said receiving aperture during a closing operation, said locking stud flexes to substantially eliminate said slot thus reducing a length of said major axis to be substantially equal to said truncated cone smaller diameter, to enable said head portion to pass completely through said receiving aperture, at which point said locking stud returns to a non-flexed shape causing a portion of said head portion to overlap said cover portion and thus restrain the cover portion in the closed condition.

7. The single-piece molded plastic hanger defined in claim 6 , wherein said backing-plate portion defines semi-annular openings in a portion of said backing plate partially surrounding said locking studs, to facilitate pivoting of said locking studs during engagement with said receiving apertures when rotating said cover portion to the closed condition.

8. The single-piece molded plastic hanger defined in claim 1 , wherein respective ends of said backing-plate portion and said cover portion sealingly contact each other when said cover portion is in said closed condition.

9. The single-piece molded plastic hanger defined in claim 5 , wherein said receiving recesses for said supporting studs and said receiving apertures for said locking studs include an annular reinforcing portion on the inner face of said cover portion.

10. A method of forming a single-piece molded plastic hanger, for use in a strip door system to support vertically hanging flexible plastic strips, each strip having a row of uniformly spaced apertures along an upper end portion, said method comprising

providing an injection mold for molding a single-piece plastic hanger having an elongated backing-plate portion, an elongated cover portion, and an elongated hinge portion connecting a longitudinal edge of said backing-plate portion and a longitudinal edge of said cover portion,

injecting plastic material, at a temperature of about 550° F., into said injection mold, to form said plastic hanger,

removing said formed single-piece plastic hanger from said injection mold when the temperature of said plastic hanger is in a range of 150° F. to 200° F., and while at a temperature within said range, pivoting said backing-plate portion and said cover portion about said hinge portion a plurality of times.

11. The method of forming the single-piece molded plastic hanger defined in claim 10 , wherein said plastic material is polypropylene.

Assignments (18)