PROBLEM TO BE SOLVED: To provide a back frame structure of a vehicle seat, which can improve flexural rigidity of side frames by a lower frame that connects lower end part sides of the right and left side frames.SOLUTION: A back frame structure of a vehicle seat includes: an upper frame 13 that connects a right side frame 11 and a left side frame 12 to be placed across upper end part sides thereof; and a lower frame 14 that connects the side frames to be placed across lower end part sides thereof. The right side frame 11 has a cross section which is a constant closed cross section. A right connection part 14b which connects the lower frame 14 to the right side frame 11 has an approximately U-shape that opens forward, and is formed on a front open cross section to be fitted to a closed cross section of the right side frame 11 over a predetermined vertical length from the outside. The back frame structure is formed in such a manner that the front/rear direction length of a contour line of a fitting cross section where the front open cross section is fitted to the closed cross section is gradually larger from the upper portion to the lower portion.SELECTED DRAWING: Figure 1

    【課題】乗物用シートのバックフレーム構造において、左右のサイドフレームの下端部側同士を連結するロアフレームによってサイドフレームの曲げ剛性を高めることができる構造を提供する。【解決手段】右サイドフレーム11と左サイドフレーム12との上端部側間を架け渡し状に連結するアッパフレーム13と、下端部側間を架け渡し状に連結するロアフレーム14と、を有する。右サイドフレーム11は横断面が一定の閉断面であり、ロアフレーム14の右サイドフレーム11への連結部である右連結部14bは前方に向って開口する略U字状であるとともに右サイドフレーム11の閉断面に外側から所定の上下長さに渡って嵌り合う前開断面に形成されている。閉断面に対して前開断面が嵌り合った状態の嵌合断面の外形線の前後方向長さは上部から下部にかけて徐々に大きくなるように形成されている。【選択図】図1


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    Title :

    BACK FRAME STRUCTURE OF VEHICLE SEAT


    Additional title:

    乗物用シートのバックフレーム構造


    Contributors:

    Publication date :

    2017-11-30


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    Japanese


    Classification :

    IPC:    B60N SEATS SPECIALLY ADAPTED FOR VEHICLES , Sitze besonders für Fahrzeuge ausgebildet



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