Patent ID: 7481493
Filing Date: 2009-01-27
Classification: A47C,B60N

Abstract:
1. A seat structure including a seat cushion having a cushioning member for the a seat cushion stretched across a cushion frame, and a seat back having a cushioning member for the a seat back stretched across a back frame, comprising: at least one of a supporting pressure adjusting means for the seat cushion for changing a supporting pressure of the cushioning member for the seat cushion and a supporting pressure adjusting means for the seat back for changing a supporting pressure of the cushioning member for the seat back, wherein said supporting pressure adjusting means for the seat cushion and said supporting pressure adjusting means for the seat back comprises: a cloth spring provided on the back of the cushioning member for the seat cushion or the cushioning member for the seat back respectively and stretched across the cushion frame or the back frame; and a cloth spring adjusting member to adjust tension of said cloth spring, wherein said cloth spring adjusting member adjusts the tension of said cloth spring to change the supporting pressure of the cushioning member for the seat cushion stretched across the cushion frame or the supporting pressure of the cushioning member for the seat back stretched across the back frame; a movable frame fixed horizontally and being pivotable forward and backward on the front of the cushion frame, and engaging with said cloth spring; a torsion bar horizontally hung on in the rear of the cushion frame; a L-shaped arm rotatable using both ends of the torsion bar as a rotational center; and a rear end supporting frame hung on parallel to and downward from the torsion bar via the L-shaped arms supporting the rear end supporting frame, the rear end supporting frame serving as a portion of the cushion frame and connected with said cloth spring, wherein one end of said cloth spring composing said supporting pressure adjusting means for the seat cushion is disposed on the a front of the cushion frame along a width direction and engaged with the movable frame pivotable forward and backward, and the other end of said cloth spring is connected to the rear end supporting frame; and wherein said cloth spring adjusting member is structured such that it can pivot the movable frame forward and backward so that the movable frame displaces the rear end supporting frame and the tension of said cloth spring variably, and at least a portion of the cushioning member for the seat cushion is displaced in a direction protruding upward by pivoting the movable frame forward in a seated state to raise the supporting pressure.