Patent ID: 8523284
Filing Date: 2013-09-03
Classification: B60N

Abstract:
1. A seat frame comprising: a seat cushion frame including a front-rear direction frame extending along a front-rear direction of a seat cushion of a vehicle seat and supporting the seat cushion; a seatback frame with a retractor installed to retain one end of a seat belt, including an upward-downward direction frame extending along an upward-downward direction of a seatback of a vehicle and supporting the seatback; a recliner arranged between a rear end portion of the front-rear direction frame and a lower end portion of the upward-downward direction frame, the recliner being adapted to rotate for adjusting an inclination angle of the seatback relative to the seat cushion; a reinforcement plate placed between the upward-downward direction frame and the recliner, the reinforcement plate being joined with the upward-downward direction frame in lap-joint fashion for reinforcing the strength of the upward-downward direction frame against the tensile force from the seat belt; a projecting portion formed on a surface of the recliner to face the reinforcement plate, the projection portion having a cross sectional shape with a recessed portion and a protruded portion in a rotational direction of the recliner; the reinforcement plate including a first through-hole for fitting the projecting portion; the upward-downward direction frame including a second through-hole larger than the first through-hole which extends within the second through-hole when the upward-downward direction frame and the reinforcement plate are overlaid; and a three-member welding portion formed by a projecting portion periphery of the projecting portion, a first through-hole periphery of the first through-hole, and a second through-hole periphery of the second through-hole wherein the recliner, the reinforcement plate and the upward-downward direction frame are welded together in a state which the projecting portion of the recliner fits into the first through-hole of the reinforcement plate while the reinforcement plate and the upward-downward direction frame are overlaid.