| 摘要 |
The hinge between first (1) and second (3) spectacle frame components consists of a first section with a slot and a second one with a tongue (7) engaging with it, with holes through both sections to receive a hinge pin. The hinge pin has a thin centre section (5c) between two heads of larger diameter, and it is inserted through the aligned holes in the hinge sections so that the surfaces of the two heads lie flush with the slotted hinge section, and its thin centre section aligns with a notch (23c) of matching shape in the tongue hole. The effort of the spring (9) keeps the pin's centre section in the notch and prevents it from dropping out.
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