| 摘要 |
The invention is aimed at a door closer of the so-called invisible type, consisting of a helical door return spring contained in a tubular structure of the known conventional type, to allow it to be incorporated in a corresponding perforation on the "edge" of the door, but improved in that: it is combined with a complementary original hydraulic damping structure of the same tubular and coaxial cross-section for being received in the same perforation, but simply deeper and not needing any compensation of the volume of the rod of the hydraulic piston coupled to that of the spring-arming piston, whilst the adjusting screw, which can be activated only before installation, nevertheless allows an adaptation to the operating conditions.
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