专利名称：Adjustable-height ladderunlimited
发明人：Kyle Shannon
申请号：US10352969
申请日：20030129
公开号：US20030159881A1
公开日：
royce
20030828
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专利附图：
pb是什么意思
门的英文单词国庆节英语手抄报素材摘要：An adjustable-height stepladder has an upper-front frame and an upper-rear frame interconnected by a top member. The upper-front frame and the upper-rear
frame each have an elongate slide track. A lower-front frame, wider than the upper-front frame and positioned centrally rearward thereof, has a pair of rails, each having a slide
儿童一对一英语mechanism slidingly engageable with the slide track of the corresponding upper-front frame rail. A lower-rear frame, wider than the upper-rear frame and positioned centrally forward thereof, has a pair of rails, each having a slide mechanism slidingly engageable with the slide track of the corresponding upper-rear frame rail. Each slide mechanism has a hinged swing arm and a biasing spring, the combination of which allows the slide mechanisms to engage the slide tracks although the lateral distance between the upper-frame rails and their corresponding lower-frame rails may vary. Accordingly, the stepladder is height-adjustable when the rails of the various frames are flared as well as when they are parallel.
大连学英语
crunchy申请人：SHANNON KYLEacquired
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