To obtain a headrest support structure which can easily and steplessly adjust a height of a headrest in a seat vertical direction.SOLUTION: A leg part 22A of a headrest stay 22 is inserted into a cylindrical member 32. A recess 32X which is annularly and recessively formed along a circumferential direction is formed at an internal peripheral face 32N of the cylindrical member 32. The recess 32X comprises a pair of vertical tapered parts 32B which are inclined so as to gradually narrow mutual vertical opposing intervals toward a recess bottom side from its opening end side. A plurality of balls 34 arranged in the recess 32X are aligned in a circumferential direction of the internal peripheral face 32N of the cylindrical member 32, contact with both the cylindrical member 32 and the leg part 22A of the headrest stay 22, hold the leg part 22A by friction forces, and when the leg part 22A is vertically moved, become rotatable while being regulated in relative displacements in a vertical direction with respect to the internal peripheral face 32N of the cylindrical member 32 by a pair of the vertical tapered parts 32B.SELECTED DRAWING: Figure 2B
【課題】ヘッドレストのシート上下方向の高さを容易に無段階で調節することができるヘッドレスト支持部構造を得る。【解決手段】筒状部材32にはヘッドレストステー22の脚部22Aが挿通されている。筒状部材32の内周面32Nには、その周方向に沿って環状かつ凹状に形成された凹部32Xが設けられ、凹部32Xは、その開口端側から凹底側へ向けて徐々に互いの上下対向間隔を狭めるように傾斜した上下一対のテーパ部32Bを備えている。凹部32X内に配置された複数のボール34は、筒状部材32の内周面32Nの周方向に並び、筒状部材32とヘッドレストステー22の脚部22Aとの両方に接触すると共に摩擦力によって脚部22Aを保持し更に脚部22Aを上下動させた場合に上下一対のテーパ部32Bによって筒状部材32の内周面32Nに対する上下方向の相対変位が規制されつつ回転可能となっている。【選択図】図2B
HEADREST SUPPORT STRUCTURE
ヘッドレスト支持部構造
2023-10-16
Patent
Electronic Resource
Japanese
IPC: | B60N SEATS SPECIALLY ADAPTED FOR VEHICLES , Sitze besonders für Fahrzeuge ausgebildet |