| 摘要 |
A centering rotary positioning type automatic closing device is simple and compact in structure, with no resistance felt when pushed slowly, and is stable to locate and not easy to fall off. A sliding guide rail (2) is slideably mounted on a fixed guide rail (1), and a guide base (3) is fixedly mounted at the bottom of the fixed guide rail (1) and is provided with a guide portion(6) the direction of which is the same as the sliding direction of the sliding guide rail (2). A slide block (4) is mounted on the guide portion (6) of the guide base (3), the guide base (3) is connected with the slide block (4) by a spring (7), and the guide portion (6) is provided with a guide groove (8). A centering boss (10) and a rotary boss (11) are arranged at the bottom of a baseboard (9) of a shifting block (5), the centering boss (10) penetrates through a fixing hole (12) of the slide block (4), and the rotary boss (11) penetrates through a rotary groove (13) of the slide block (4) and then extends into the guide groove (8). A positioning groove (14) communicated with the guide groove (8) is formed in the front end of the guide groove (8), a concave open-groove (16) is formed in a shifting portion (15) on the baseboard (9) of the shifting block (5), a fixture block (17) at the bottom of the sliding guide rail (2) can be clamped into the concave open-groove (16), and a notch end surface (18) of the concave open-groove (16), which is positioned on the side of an opening direction of the sliding guide rail (2), is lower than a notch end surface (19) of the concave open-groove (16), which is positioned on the side of a closing direction of the sliding guide rail (2). |
