| 摘要 |
<p>The purpose of my invention is to make more convenient the automatic opening and closing of doors. It is an automatic cylinder-shaped gadget (9) whose purpose is to close door; it functions hydraulically thanks to its springs (8). It is to be fitted into the door and remains invisible. To activate the door-check it is sufficient to remove the safety-catch positioned on the external side of the plate. It is equipped with a click regulation used for closing the door. It has no external regulator for hydraulic oil, because the adjustment takes place automatically inside the piston, which functions on the basic of a definitive metering. It is very resistant.</p> |
