| 摘要 |
A Braille pin (10) has three parts sharing a common longitudinal axis. A first part (10a) has a first breadth and includes a rounded tip felt by a user. A second part (10b) has a noncircular transverse cross-section and has a breadth greater than the first breadth. A first shoulder (12a) is formed by the juncture of the first and second parts. A third part (10c) has a third breadth less than the second breadth. A second shoulder (12bb) is formed at the juncture of the second and third parts. A pinhole has first, second, and third sections that respectively receive the first, second and third parts of the pin. The first shoulder limits upward pin travel by abutting an overhang at the juncture of the first and second pinhole sections. The second shoulder limits downward pin travel by abutting a step at the juncture of the second and third pinhole sections. |
