| 摘要 |
A hinge for collapsible ladders, includes an external frame including a center aperture and a pair of locking apertures; an inner frame rotatable with the external frame and including a center aperture and pairs of locking apertures; a rotary plate rotatably disposed between the frames and having locking apertures; a substantially flat rotary spring having one end mounted to the inner frame and an opposite end mounted to the rotary plate; a hub member rotatably connecting the frames about the center apertures, and including a locking end at one side; a locking part for extension into the locking apertures to fix an angle of the frames relative to each other; a press axle connected with the locking part, passing through the hub member, and including a bearing end; and a spring positioned between the hub member locking end and the press axle bearing end.
|
