Patent attributes
An automatic fitting device is configured for assembling a vehicular part. If a spring-forced automatic fitting device is inserted into a bush of a trailing arm of a chassis and the trailing arm is inserted into a vehicular frame in the state in which buttons provided in the automatic fitting device are pushed, the vehicular frame and the chassis are provisionally assembled with each other as the buttons are projected through bolting holes, thereby enabling the automatization of assembling operation and reducing the working hours. In addition, because it is unnecessary to separately manufacture a conventional chassis bracket, the manufacturing costs can be saved.