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A door system comprising, a plurality of sections pivotally joined to each other by a hinge assembly, the hinge assembly being pivotally supported on one of the sections and having a leg that extends from the one of the sections to an adjacent section to attach thereto, a stop assembly including a s

A door system comprising, a plurality of sections pivotally joined to each other by a hinge assembly, the hinge assembly being pivotally supported on one of the sections and having a leg that extends from the one of the sections to an adjacent section to attach thereto, a stop assembly including a stop member extending forwardly from the leg toward a stop receiver carried on the one of the sections, whereby interaction of the stop member and the stop receiver ensure alignment of the sections.

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1. A door system comprising, a plurality of sections pivotally joined to each other by a hinge assembly, said hinge assembly being pivotally supported by and transversely movable relative to one of said sections, a leg of said hinge assembly that extends from said one of said sections and is attache

1. A door system comprising, a plurality of sections pivotally joined to each other by a hinge assembly, said hinge assembly being pivotally supported by and transversely movable relative to one of said sections, a leg of said hinge assembly that extends from said one of said sections and is attached to an adjacent of said sections, and a centering assembly including a tab member extending from one of said leg and said one of said sections toward a tab receiver carried on the other of said leg and said one of said sections, whereby interaction of said tab member and said tab receiver ensures transverse alignment of said sections when said sections are in planar alignment.2. The door system of claim 1, wherein said tab member tapers transversely inwardly as said tab member extends from said leg toward said tab receiver.3. The door system of claim 1, wherein said tab member is formed integral with said leg of said hinge.4. The door system of claim 1, wherein said tab receiver is a cutout formed in a portion of said one of said sections.5. The door system of claim 4, wherein said portion of said one of said sections where said cutout is formed is a stile.6. The door system of claim 5, wherein said stile pivotally and transversely movably supports said hinge assembly.7. The door system of claim 6, wherein said hinge assembly is pivotally attached to said stile at an intermediate position relative to the front and rear of said one of said sections.8. The door system of claim 5, wherein said hinge assembly has a pivot pin and said stile has pivot pin receivers, whereby said pivot pin is insertable in said pivot pin receivers.9. The door system of claim 8, wherein said pivot pin is axially movable in said pivot pin receivers.10. The door system of claim 1 further comprising, a spacing assembly including a spacing member extending forwardly from said leg of said hinge, said spacing member being insertably received between said sections as said sections become aligned in a common plane, whereby said spacing member engages at least one of said sections to provide a selected vertical spacing of said sections.11. The door system of claim 10, wherein said spacing member is a projecting tab.12. The door system of claim 1, wherein said leg of said hinge assembly includes openings adapted to receive fasteners permitting relative transverse adjustment between said hinge and said adjacent of said sections when said sections are in planar alignment.13. The door system of claim 12, wherein said openings are transverse slots in said leg.14. The door system of claim 1, wherein said hinge assembly is mounted on a stile on said one of said sections and said stile includes a pair of spaced axially aligned receiver bores adapted to rotatably and axially movably support a pivot pin on said hinge assembly.15. The door system of claim 14, wherein said leg is attached to an adjacent of said sections at a stile attached thereto.16. A door system comprising, a plurality of sections pivotally joined to each other by a hinge assembly, said hinge assembly being pivotally supported on one of said sections and having a leg that extends from said one of said sections and is attached to an adjacent of said sections, and a centering assembly including a tab member extending forwardly from said leg toward a tab receiver carried on said one of said sections, whereby interaction of said tab member and said tab receiver ensures alignment of said sections when said sections are in planar alignment, said tab member having a first portion extending from said leg and a second portion extending from said first portion and vertically offset therefrom, whereby said first portion and said second portion are not coplanar.17. The door system of claim 16, wherein an inclined connecting portion joins said first and second portions of said tab member.18. The door system of claim 17, wherein said connecting portion extends upwardly and forwardly from said first portion of said tab member.19. A door system comprising, a plurality of sections pivotally joined to each other by a hinge assembly, said hinge assembly being pivotally supported on one of said sections and having a leg that extends from said one of said sections and attached to an adjacent of said sections, a centering assembly including a tab member extending forwardly from said leg toward a tab receiver carried on said one of said sections, whereby interaction of said tab member and said tab receiver ensures alignment of said sections when said sections are in planar alignment, at least one centering gusset extending forwardly from said leg of said hinge and tapering from said leg toward a peak, and a centering gusset receiver having a profile adapted to interact with said centering gusset to urge said peak toward a selected position.20. The door system of claim 19, wherein said profile is semicircular.21. A door system comprising: a plurality of sections pivotally joined and transversely relatively movable by a hinge assembly; said hinge assembly being rotatably supported on one of said sections and attached to an adjacent of said sections; said hinge being rotatable on an axis; alignment means carried on said hinge assembly and said one of said sections urging said sections axially along said axis into transverse alignment with each other during a selected portion of an operating range of the door, while permitting controlled movement relative to each other along said axis during other portions of said operating range.22. The door system of claims 21 further comprising, spacing means carried on said hinge and adapted to engage at least one of said sections when said sections are in a selected position to urge said sections into selected vertical spacing relative to each other.23. The door system of claim 21, wherein said alignment means has a tab member on said hinge for operatively engaging a tab receiver on said one of said sections.24. The door system of claim 23, wherein said alignment means has a centering gusset on said hinge for operatively engaging a centering gusset receiver on said one of said sections.25. A method of assembling a sectional door comprising the steps of providing a plurality of sections each having at least one stile with a pair of transversely aligned receivers, arranging said sections in stacked adjacent co-planar relationship, positioning a single leaf hinge having spaced pivot portions in canted relation to said stile, inserting one of said pivot portions of said hinge in one of said receivers, aligning said hinge with said stile, inserting the other of said pivot portions of said hinge in the other of said receivers in said stile to pivotally mount said hinge relative to said stile, aligning said hinge axially of said pivot portions relative to said stile, and attaching said hinge to an adjacent of said sections.26. The method of assembling a sectional door according claim 25, wherein said step of aligning said hinge includes employing a centering tab on either of said hinge and said stile and employing a tab receiver on the other of said hinge and said stile, said centering tab and said tab receiver engaging to effect transverse relative alignment of said sections.27. The method of assembling a sectional door according claim 25 further comprising the step of employing a spacing assembly on said hinge to effect relative vertical positioning of said sections when in the stacked planar position.28. A door system comprising, a plurality of sections pivotally joined to each other by a hinge assembly, said hinge assembly being pivotally supported by and transversely movable relative to one of said sections, a leg of said hinge assembly that extends from said one of said sections and is attached to an adjacent of said sections, and a centering assembly including a centering gusset member extending from one of said leg and one of said sections toward a centering gusset receiver carried on the other of said leg and said one of said sections, whereby interaction of said centering gusset and said centering gusset receiver ensures transverse alignment of said sections when said sections are in planar alignment.29. The door system of claim 28, wherein said centering gusset tapers to a peak and said centering gusset receiver has a profile adapted to interact with said centering gusset to urge said peak toward a selected position.30. The door system of claim 29, wherein said profile of said centering gusset receiver is a concave recess.