| 摘要 |
<p>A lambdoidal ladder comprises front struts(100), back struts(200), treads(500), a folding device(400), a connection device(600) and a platform(300). Wherein, the platform(300) is connected to the front strut(100) and the back strut(200), and the structure between the front strut and the back strut is a rotatable connection; the platform(300)comprises a body(310) and a transverse rod(320)which goes through the front strut(100), an orientation slot(314)matching to the transverse rod(320) is set under the body(310); the folding device(400)fixed to the middle part of the front strut and the back strut is constructed a hinge with a H figuration; the tread (500) is fixed to the front and back struts by the connection device(600).</p> |
