Patent ID: 9604559
Date: 2017-03-28
CPC Classifications: B60N

Claim:
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; wherein the second driving part comprises: a second motor provided to be vertically movable along the guide rod; a second lead screw extending in parallel with the hinge shaft and rotatably driven by the second motor; at least one nut having a thread formed on an inner peripheral surface thereof to be engaged with the second lead screw, and moving along an outer peripheral surface of the second lead screw along with rotation of the second lead screw; and a plurality of link members connecting the nut to each of the first and second hinge members.