초록

The seat has a backrest with an adjustable vertebral support comprising two separate adjusting elements which act against the rear of the backrest cushion to vary the curvature and spinal support effect thereof, at two different levels in the heightwise direction of the backrest.

대표청구항 ▼

A seat having a backrest including a backrest cushion positioned on a backrest structure which comprises an adjustable vertebral support positioned within said backrest and comprised of first and second adjusting elements disposed one above the other in a heightwise direction adapted to act on a rea

A seat having a backrest including a backrest cushion positioned on a backrest structure which comprises an adjustable vertebral support positioned within said backrest and comprised of first and second adjusting elements disposed one above the other in a heightwise direction adapted to act on a rear portion of said backrest cushion, said adjusting elements being comprised of spring plate members having first and second ends, said first ends of said spring plate members being fixedly held, said second end members being movably mounted to permit curving of said spring plate members, said second end members being mounted to a common connecting member displaceably mounted to said backrest structure of said backrest by spaced apart pin-and-slot type guide elements, said spaced apart pin-and-slot type guide elements being disposed from one another in said heightwise direction; and an actuating member for cooperating with said connecting member and disposed between said guide elements transversely movably with respect to said heightwise direction of said backrest whereby movement of said actuating member against spring force of said spring plate member causes said spring plate member closest to a point at which said actuating member cooperated with said connecting member to pivot about said pin of said guide element furthest from said point whereat said pin of said guide element closest to said point is caused to abut said slot of said guide element closest to said point whereby said other spring plate member is caused to be compressed to pivotally move about said pin of said guide member closest to said point.