| 摘要 |
<p>A rigid binder has a cylindrical main portion (1), a hanging hook one (2) and a hanging hook two (3) placed on the two ends of the main portion (1). The main portion (1) is equipped with a handle (8). The hanging hook one (2) and the hanging hook two (3) are both provided with screw rods (2a, 3a) and are respectively connected to the two ends of the main portion by the screw threads of the screw rods (2a, 3a) thereon, and the screw thread spin directions of the screw rods (2a, 3a) on the hanging hook one (2) and the hanging two (3) are reverse to each other. The rigid binder can be operated conveniently and has high safety and stability.</p> |
