Lumber support for seat.

摘要

A support shaft (12) has an integral protrusion (17) which is abuttingly engageable with an arcuate portion (13A) of a support panel (13) for thereby limiting rotation of the support panel (13) relative to the support shaft (12). A protrusion (15) is provided to each axial end (14) of the support shaft (12), whilst an opening (25) with a slit-like opening portion (27) is provided to each side panel (23) of a seat back frame (21). The protrusion (15) at each axial end (14) of the support shaft (12) and the opening (25) at each side panel (23) is constructed and arranged so that each axial end (14) is capable of passing through the opening (25) only when the support shaft (12) is held in a particular position The support shaft (12) is put out of the particular position when in use such that each axial (14) end is prevented from slipping off from the opening (25). <IMAGE>