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A key member or key for joining muntin or spacer bars in a dual pane window include an insertion end for frictional engagement in the open ended passage of a spacer bar and a projection end comprised of axially extending, spaced prongs that include teeth or serrations that enable interlocking with p

A key member or key for joining muntin or spacer bars in a dual pane window include an insertion end for frictional engagement in the open ended passage of a spacer bar and a projection end comprised of axially extending, spaced prongs that include teeth or serrations that enable interlocking with projecting prongs of a like key member.

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1. A key construction for joinder of first and second hollow muntin bars, each muntin bar having a hollow end, said construction comprising, in combination: a first key member including an insertion end and an interlocking end;a separate second key member including an insertion end and an interlocki

1. A key construction for joinder of first and second hollow muntin bars, each muntin bar having a hollow end, said construction comprising, in combination: a first key member including an insertion end and an interlocking end;a separate second key member including an insertion end and an interlocking end;each said key member including a longitudinal axis, the insertion end of each key member comprising at least one axially extending support rib, said support rib including at least one pair of oppositely extending, generally transversely extending wings, said wings sized and positioned for frictional engagement into the hollow end of a muntin bar; andsaid interlocking ends of the first and second key members each including a substantially identical, axially projecting prong, said axially projecting prongs each including a surface with interlocking elements, said interlocking elements of said first and second prongs engaged with each other whereby said first and second key members are joined together. 2. The key construction of claim 1 wherein said each key member includes first and second interlocking axially projecting prongs, each of said prongs including axially transverse serrations for adjustable interlocking of the prongs of said first and second key members. 3. The key construction of claim 1 wherein the interlocking end of said each key member includes first and a second laterally spaced elongate prong extending axially from the insertion end of said key member, one of said first and second prongs of each key member being offset laterally from an axial centerline of said insertion end of each key member. 4. The key construction of claim 1 wherein the key members are fabricated from a plastic material. 5. The key construction of claim 1 further comprising with first and second hollow muntin bars. 6. The key construction of claim 1 further comprising with spaced, open ended, first and second hollow muntin bars. 7. A key construction for joinder of first and second hollow muntin bars, each muntin bar having a hollow end, said construction comprising, in combination: a first key member including an insertion end and an interlocking end, said insertion end including a frictional engagement element means to engage and retain the first key member in the hollow end of a first muntin bar;a separate second key member including an insertion end and an interlocking end, said insertion end including a frictional engagement element means to engage and retain the second key member in the hollow end of a second muntin bar; andsaid interlocking ends of the first and second key members each including a first axially extending prong and a second axially extending prong, said first and second prongs laterally spaced from each other by a dimension generally equal to the maximum width of the first prong, said first prong having a first lateral side and a second opposite lateral side, said first lateral side generally coincident with a centerline longitudinal axially extending axis of said key member. 8. The key construction of claim 7 wherein the first lateral side of the first prong is spaced from and opposed to a lateral side of the second prong, and the second lateral side of the first prong and the lateral side of the second prong include at least one interlocking element which by insertion of the first prong of the second key member intermediate the first prong and second prong of the first key member interlocks a prong of one of said key members to a prong of the other key member. 9. A key construction for joinder of first and second hollow muntin bars, each muntin bar having a hollow end, said construction comprising, in combination: a first key member including an insertion end and an interlocking end, said insertion end including a frictional engagement element means to engage and retain the first key member in the hollow end of a first muntin bar;a separate second key member including an insertion end and an interlocking end, said insertion end including a frictional engagement element means to engage and retain the second key member in the hollow end of a second muntin bar; andsaid interlocking ends of the first and second key members each including a substantially identical, axially projecting prong, said axially projecting prongs each including a surface with interlocking elements, said interlocking elements of said first and second prongs engaged with each other whereby said first and second key members are joined together wherein one of the projecting elongate prongs of one of said key members extends axially from the insertion end, with an outside face being generally aligned with an axial centerline of said insertion end of said one of said key members. 10. A key construction for joinder of hollow muntin bars, comprising, in combination: a key member including an insertion end and an interlocking end, said insertion end including a configuration for frictionally engaging the first key member into the hollow end of a first muntin bar;said key member including a longitudinal axis, the insertion end of said key member comprising at least one axially extending support rib, said support rib including at least one pair of oppositely extending, generally transversely extending wings, said wings sized and positioned for frictional engagement into the hollow end of a muntin bar;said key member projection end including a first axially extending prong and a second axially extending prong, said first and second prongs laterally spaced from each other by a dimension generally equal to the maximum width of the first prong, said first prong having a first lateral side and a second opposite lateral side, said first lateral side generally coincident with a centerline longitudinal axially extending axis of said key member. 11. The key construction of claim 10 wherein the first lateral side of the first prong is spaced from and opposed to a lateral side of the second prong, and the second lateral side of the first prong and the lateral side of the second prong includes at least one interlocking element which by insertion of the first prong of a second key member intermediate the first prong and second prong of the first key member interlocks a prong of one of said key members to a prong of the other key member. 12. The key construction of claim 10 wherein said key member first and second interlocking axially projecting prongs include an axially transverse serrations for adjustable interlocking of the prongs. 13. The key construction of claim 10 wherein the projecting members comprise first and second spaced elongate prongs extending axially from the insertion end, one of said prongs being offset laterally from an axial centerline of said insertion end of said key member. 14. The key construction of claim 10 wherein the interlocking and comprises at least one elongate rib member extending axially from the insertion end, said one rib member having an outside face being generally aligned with an axial centerline of said insertion end. 15. The key construction of claim 10 wherein the key member is fabricated from a plastic material. 16. The key construction of claim 10 in combination with hollow muntin bars. 17. The key construction of claim 10 in combination with a spaced, open ended hollow muntin bars. 18. A key construction for joinder of first and second generally hollow muntin bars, comprising, in combination: a first key member including an insertion end and an interlocking end, said insertion end including a configuration for frictionally engaging the first key member into the hollow end of a first muntin bar;a second key member including an insertion end and an interlocking end, said insertion end including a configuration for frictionally engaging the second key member into the hollow end of a second muntin bar;said interlocking end of the first and second key members being substantially identical and comprising an axially projecting first prong, said axially projecting first prongs engageable by interlocking for holding the first and second key members joined together in combination; andwherein each key member interlocking end includes a second axially extending prong, said first and second prongs of each key member laterally spaced from each other by a dimension generally equal to the maximum width of the first prong, said first prong having a first lateral side and a second opposite lateral side, said first lateral side generally coincident with a centerline longitudinal axially extending axis of said key member. 19. A key construction for joinder of first and second generally hollow muntin bars, comprising, in combination: a first key member including an insertion end and an interlocking end, said insertion end including a configuration for frictionally engaging the first key member into the hollow end of a first muntin bar;a second key member including an insertion end and an interlocking end, said insertion end including a configuration for frictionally engaging the second key member into the hollow end of a second muntin bar;said interlocking end of the first and second key members being substantially identical and comprising an axially projecting first prong, said axially extending first prongs engageable by interlocking for holding the first and second key members joined together in combination; andwherein the projecting prongs comprise at least one elongate prong extending axially from the insertion end, said one elongate prong having an outside face generally aligned with an axial centerline of said insertion end. 20. A key construction for joinder of first and second generally hollow muntin bars, comprising, in combination: a first key member including an insertion end and an interlocking end, said insertion end including a configuration for frictionally engaging the first key member into the hollow end of a first muntin bar;a second key member including an insertion end and an interlocking end, said insertion end including a configuration for frictionally engaging the second key member into the hollow end of a second muntin bar;said interlocking end of the first and second key members being substantially identical and comprising an axially extending first prong, said axially first extending prongs of said first and second key members engageable by interlocking for holding the first and second key members joined together in combination, andone of said first and second prongs being offset laterally from an axial centerline of said insertion end of each key member. 21. A key construction for joinder of hollow muntin bars, comprising, in combination: a first key member including an insertion end and an interlocking end, said insertion end including at least one frictional engagement member means to retain the first key member in the hollow end of a first muntin bar;a second key member including an insertion end and an interlocking end, said insertion end including at least one frictional engagement member means to retain the second key member in the hollow end of a second muntin bar; andsaid interlocking end of one of the first and second key members comprising a first axially projecting prong, said axially projecting first prong including a surface with serrations; andthe other of one of said key members including a second axially projecting prong substantially identical to said first axially projecting prong, said serrations of said first and second axially projecting prongs engaged with each other whereby the first and second key members are joined.