| 摘要 |
A structural arrangement in a pneumatic floor spring has a small size, requires drilling a hole in the floor for its installation, has a shielded structure that prevents the accumulation of water, and keeps the door (100) closed by the force applied by the plunger (80) and, when the door is opened, the pin (30) rotates together with the cam (60) which, with the double helix, pushes downwards the track (70) and the plunger (80). |
