| 摘要 |
Disclosed is a spring cylinder comprising: a cylinder housing (10); a first end cap (20); a first spring cup (31) and a first spring (30) provided inside the first spring cup (31); a first connection portion (40); a second end cap (50); a second spring cup (62) and a second spring (60) provided inside the second spring cup (62); a stopper housing (70); a cylinder rod (80); and a stopper (90). According to the present invention, since the cylinder rod is automatically pulled in after withdrawal by the first spring and the second spring, the cylinder rod can be operated by the extension and the compression of the springs when applying the present invention to the automatic closing of an automatic door or gate requiring a cylinder and the like, thereby solving conventional problems such as gas-filled gas cylinders, oil-filled hydraulic cylinders, and air-filled pneumatic cylinders. |
