| 摘要 |
PURPOSE: An automatic door for vehicles is provided to prevent a vehicle crash to a motorcycle or another vehicle which comes closely from the rear when a user opens the door. CONSTITUTION: An automatic door for vehicles comprises a steel sheet and a hydraulic cylinder. The hydraulic cylinder is coupled with the long steel plate. The hydraulic cylinder is formed into a multi-stage. The hydraulic cylinder is folded or unfolded when oil flows into or is discharged from the hydraulic cylinder.
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