Seat lifter

Abstract

[Problem] The present invention relates to a seat lifter capable of changing the height or inclination of an inner side lower arm and outer side lower arm of a seat cushion and addresses the problem of providing a seat lifter wherein the welding position of a rod to a link remains fixed. [Solution] Links (link members) ( 19, 191, 61, 161 ) are provided with shaft sections ( 31 a, 119 b, 61 a, 161 b ) having through holes and are rotatably held on the outer peripheral surfaces of the shaft sections ( 31 a, 119 b, 61 a, 161 b ). Rods ( 53, 69 ) are inserted through the through holes of the links ( 19, 191, 61, 161 ) and welded.

What is claimed is: 
     
         1 . A seat lifter capable of changing height or inclination of an inner-side lower arm and outer-side lower arm of a seat cushion, the seat lifter comprising:
 a first link member provided at one lower arm of an outer-side lower arm and an inner-side lower arm;   a second link member provided at an other lower arm of an inner-side lower arm and an outer-side lower arm; and   a rod having one end attached to a first link member and an other end attached to the second link member,   wherein at least one of the link members includes a shaft portion with a hole and is rotatably held in the lower arm on an outer peripheral surface of the shaft portion, and   wherein the rod is welded in a state of being inserted into the hole of the link member.   
     
     
         2 . The seat lifter according to  claim 1 ,
 wherein the shaft portion is formed integrally with the link member.   
     
     
         3 . The seat lifter according to  claim 1 ,
 wherein the link member comprises:   a link; and   a bush that is provided to the link and is configured by a cylindrical portion, both ends of which are formed as an open face and which serves as the shaft portion, and a collar portion, which is formed at an outer peripheral surface of the cylindrical portion and welded to an edge of a hole of the link.   
     
     
         4 . The seat lifter according to  claim 1 ,
 wherein the shaft portion of the first link member is formed integrally with the first link member, and   wherein the second link member comprises:   a link; and   a bush that is provided in the link and is configured by a cylindrical portion, both ends of which are formed as an open face and which serves as the shaft portion, and a collar portion, which is formed at an outer peripheral surface of the cylindrical portion and welded to an edge of a hole of the link.   
     
     
         5 . The seat lifter according to  claim 1 ,
 wherein the shaft portion of the first link member is formed integrally with the first link member, and   wherein the shaft portion of the second link member is formed integrally with the second link member   
     
     
         6 . The seat lifter according to  claim 3 ,
 wherein the lower arm is brought into sliding contact with the side portion of the collar portion.   
     
     
         7 . The seat lifter according to  claim 3 ,
 wherein a diameter of a part of the cylindrical portion of the bush that is rotatably held in the lower arm is different from a diameter of a part of the cylindrical portion of the bush to which the rod is inserted.   
     
     
         8 . The seat lifter according to  claim 3 ,
 wherein the cylindrical portion at one side portion of the collar portion of the bush is attached to the link,   wherein the cylindrical portion at the other side portion of the collar portion of the bush is attached to the lower arm, and   wherein the collar portion of the bush is brought into sliding contact with the lower arm.