发明名称 TRAPPSTEGE
摘要 To enable use to be made of relatively thin sheet metal to be employed in the manufacture of a ladder which is formed by punching adjacent openings from the sheet to leave edge strips which are subsequently folded to form stiles and cross pieces which are twisted to form tread bodies, embossed corrugations are incorporated into the twisted metal portions between the tread bodies and the stiles, and stiffening cheeks along the edges of the tread bodies are folded below the said bodies, thereby to impart rigidity to the ladder structure. Additionally or alternatively, holes and/or further corrugations may be provided, and the stiles may, if desired, be of oval cross-section each with connecting cheeks along their facing edges.
申请公布号 SE421642(B) 申请公布日期 1982.01.18
申请号 SE19790006996 申请日期 1979.08.22
申请人 GERD * TREITZ 发明人 GERD * TREITZ
分类号 B21D53/00;E06C7/08;(IPC1-7):06C7/08 主分类号 B21D53/00
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