发明名称 Combination ladder and stair
摘要 The invention disclosed comprises a combination ladder and stair for use by children which incorporates stair-like treads and risers with ladder-like rungs to achieve safe climbing activity. The combination ladder and stair is adapted to be used at a comparatively steep angle to the ground with the treads being maintained level. The rungs are placed adjacent to and level with each tread to afford additional security for the foot, and are spaced from the tread to allow the hand to grasp around the rung. In the preferred embodiment the ladder is incorporated into a split tube which serves as an entry to a children's play system.
申请公布号 US5323874(A) 申请公布日期 1994.06.28
申请号 US19930117420 申请日期 1993.09.07
申请人 SOFT PLAY, INC. 发明人 WARREN, MITCHELL R.;DITTBERNER, DANIEL J.;STRAWCUTTER, GRANT M.
分类号 E06C7/08;(IPC1-7):A63B9/00 主分类号 E06C7/08
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