4-WAY LUMBAR SUPPORT

摘要

Disclosed herein is a 4-way lumbar support capable of automatically adjusting a vertical curved position and an amount of curvature of a lumbar plate, while securely supporting the lumbar plate even when a large load, such as the rear-end collision of a vehicle, is applied to the lumbar plate. In addition, the 4-way lumbar support can adjust an amount of forward curvature of the lumbar plate using a pusher including a pair of hinge members, thereby enabling the amount of forward curvature of the lumbar plate to be adjusted across a wider range without increasing the thickness of a seat back in the forward and backward directions thereof.

主权项

1. A 4-way lumbar support comprising:
a lumbar plate supported by a seat back frame of a vehicle seat and at least partially forming a curved part to support the back of an occupant; a guide rod fixed to the seat back frame and extending vertically; a sliding base provided to be vertically movable along the guide rod; a pusher provided to be vertically movable together with the sliding base and protruding forward toward the lumbar plate to press the lumbar plate; a first driving part vertically moving the sliding base by electric power supplied from an outside to adjust a vertical position of the pusher; and a second driving part adjusting an amount of forward protrusion of the pusher by the electric power supplied from the outside, wherein: the pusher comprises a first hinge member, a lower end portion of which is pivotably connected to the sliding base, and a second hinge member, a lower end portion of which is pivotably connected to an upper end portion of the first hinge member through a hinge shaft while an upper end portion of the second hinge member is slidably supported by the guide rod; and a distance between the lower end portion of the first hinge member and the upper end portion of the second hinge member is adjusted by action of the second driving part.