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1. 发明授权

US07690316B2 Height-adjustable folding work platform 失效
标题翻译：高度可调折叠工作平台
公开(公告)号：US07690316B2
公开(公告)日：2010-04-06
申请号：US11315611
申请日：2005-12-22
申请人： Hoe Gwan Yoo , Jung Hwan Lim
发明人： Hoe Gwan Yoo , Jung Hwan Lim
IPC分类号： A47B3/00
CPC分类号： E04G1/34 , E04G2001/242
摘要： A height adjustable folding work platform includes two footplates, a footplate folding portion that foldably connects the footplates, two legs, and two leg folding portions, each of which connect the leg to the outer end of the footplate. Each of the legs includes two support legs and a plurality of cross members that connect the support legs. The leg folding portion selectively engages with one of the cross members so that the height of the height adjustable folding work platform is adjusted.
摘要翻译：高度可调的折叠工作平台包括两个脚板，一个可折叠地连接脚踏板，两个腿和两个腿部折叠部分的脚板折叠部分，每个腿部折叠部分将脚连接到脚踏板的外端。每个腿包括两个支撑腿和连接支撑腿的多个横向构件。腿部折叠部选择性地与一个横向构件接合，从而调节高度可调折叠工作平台的高度。

2. 发明授权

US06651774B2 Combined stepladder and hand truck assembly 失效
标题翻译：组合梯子和手推车组装
公开(公告)号：US06651774B2
公开(公告)日：2003-11-25
申请号：US10074428
申请日：2002-02-19
申请人： Hoe Gwan Yoo
发明人： Hoe Gwan Yoo
IPC分类号： E06C100
CPC分类号： E06C1/393 , E06C1/397
摘要： A combined stepladder and hand truck assembly is provided. The assembly comprises a first frame having two side rails, a second frame pivotally attached to the back side of the first frame and having two side rails, and a third frame pivotally attached to the front side of the first frame and having two side rails. Steps and bars are provided so that they form a parallel link together with the side rails of the first frame. Two casters attached at the lower end of the first frame. A tool tray is provided at the lower end of the third frame. The tray is kept vertical to the frames when the assembly is used as a hand truck, and is kept horizontal when the assembly is used as a stepladder and the third frame is rotated upward to support the tool tray in a high position.
摘要翻译：提供组合的梯子和手推车组件。组件包括具有两个侧轨的第一框架，可枢转地附接到第一框架的后侧并具有两个侧轨的第二框架和可枢转地附接到第一框架的前侧并具有两个侧轨的第三框架。提供了台阶和杆，使得它们与第一框架的侧轨一起形成平行链节。两个脚轮连接在第一个框架的下端。工具托盘设置在第三框架的下端。当组件用作手推车时，托盘保持垂直于框架，并且当组件用作梯子并且第三框架向上旋转以将工具托盘支撑在高位置时保持水平。

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