| 摘要 |
<p>A thick plate type joint lock for ladder connection comprises an inner plate (21) and an outer plate (22) connected in a relatively rotating way, and a positioning shaft sleeve (23) for locking the inner plate (21) and the outer plate (22). In addition, a rotation limiting column (26) is arranged on the outer plate (22), and a groove (27) for resisting the limiting column (26) is arranged on the inner plate (21). The limiting column (26) and the groove (27) restrict rotation of the inner plate (21) relative to the outer plate (22), thus improving a load bearing capability and security of a ladder.</p> |
