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1. 发明授权

US10012000B2 Collapsible work platform 有权
公开(公告)号：US10012000B2
公开(公告)日：2018-07-03
申请号：US15252107
申请日：2016-08-30
申请人： Thomas Yoo
发明人： Thomas Yoo
IPC分类号： E04G1/34 , E04G1/30 , E04G5/16 , E04G1/22 , E06C1/39
CPC分类号： E04G1/34 , E04G1/22 , E04G1/28 , E04G1/30 , E04G5/16 , E04G2001/305 , E06C1/39
摘要： A collapsible work platform includes toprails engaging fixedly to a platform, backrails engaging the toprails pivotally through a hinge at an end portion of the pair of toprails, frontrails engaging the toprails pivotally through a hinge at the other portion of the toprails, link bars engaging the toprails pivotally, a footstep engaging the link bars and the frontrails pivotally, and braces engaging the backrails and the frontrails, and the toprails pivotally through hinges. Each of latching plates having a latching portion engages fixedly the end portions of the backrails and the frontrails maintaining the deployed state by the braces. Each of stopper blocks engage protrudingly an inner side and an outer side of one end and the other end of the toprails, so that the latching portion of the latching plate contacts and engages fixedly and the backrails and the frontrails are not deployed further beyond a certain point.

2. 发明授权

US11225833B2 Ladder with a guardrail 有权
公开(公告)号：US11225833B2
公开(公告)日：2022-01-18
申请号：US16380173
申请日：2019-04-10
申请人： Thomas Yoo
发明人： Thomas Yoo
IPC分类号： E06C7/18 , E06C1/393
摘要： A ladder with a first guardrail locking system having a first pair of side rails with a first set of steps and a second pair of side rails with a second set of steps. The two sets of side rails are rotatably joined together by a pair of hinges at a first pair joining sections and a second pair joining sections. The first pair joining sections and the second pair joining sections have joint points such as indentations which engage the locking key of a first guardrail so that the first guardrail may be fixedly attached to the joining sections.
The ladder may also have a second guardrail, wherein the second guardrail is attached to the first guardrail so that two guardrails form a ring around a user standing on a foldable stand of the ladder.

3. 发明授权

US10988985B2 Ladder 有权
公开(公告)号：US10988985B2
公开(公告)日：2021-04-27
申请号：US16017586
申请日：2018-06-25
申请人： Thomas Yoo
发明人： Thomas Yoo
IPC分类号： E06C7/42 , E06C1/18 , F16C11/04 , E06C1/32
摘要： A ladder stabilizer is provided, comprising an extension bar portion, a main arm portion, a brace bar portion, teeth strips, and levers. The extension bar portion is enclosed by an outer wall surface, an inner wall surface, and two side wall surfaces, and having upper and lower end portions. The main arm portion has upper and lower end portions configured for a telescopic connection. The brace bar portion has first and second end portions, and the first end portion is connected to the side portion at a lower position, and the second end portion is connected to the extension bar portion at a middle position. The teeth strips are fixed to lower portions of the two side wall surfaces of the main arm portion. Each lever has latching and releasing ends, installed on the two side wall surfaces of the extension bar through two spring-loaded hinges.

4. 外观设计

USD937443S1 Ladder hinge 有权
公开(公告)号：USD937443S1
公开(公告)日：2021-11-30
申请号：US29709705
申请日：2019-10-16
申请人： Thomas Yoo
设计人： Thomas Yoo

5. 发明授权

US10975622B2 Ladder 有权
公开(公告)号：US10975622B2
公开(公告)日：2021-04-13
申请号：US16010918
申请日：2018-06-18
申请人： Thomas Yoo
发明人： Thomas Yoo
IPC分类号： E06C7/06 , F16B7/10 , E06C1/18
摘要： A rung lock assembly is provided for a ladder, and comprises rung lock portions, a pinion gear, compression springs, a rung body, a rung cover, a center bolt, a spacer, and a fastener portion. Each of the rung lock portions comprises a rod portion, a rack block fixed to the rod portion, a locking portion, a holding portion connecting the rod portion to the locking portion so that the rod portion is disposed in parallel with the locking portion and configured to be held and pulled by a user's hand, and the rung lock portions are anchored by guide plates and disposed in parallel with each other. The pinion gear is disposed between and engaging the rack blocks, so that the rung lock portions translate outwards or inwards together. The distance between the locking portion is increased in both directions simultaneously by pulling one of the holding portions.

6. 发明授权

US11492847B2 Ladder 有权
公开(公告)号：US11492847B2
公开(公告)日：2022-11-08
申请号：US16799483
申请日：2020-02-24
申请人： Thomas Yoo
发明人： Thomas Yoo
IPC分类号： E06C1/18 , E06C7/08
摘要： A collapsible ladder that collapse not only the rails but also the steps, as well as the top caps, so that the ladder may be erected and then collapsed flat, saving storage space. The ladder has a pair of right siderails rotatably connected to a pair of left siderails. The right top cap and the right steps are rotatably attached in between the pair of right siderails. The right top cap and the right steps are also rotatably attached in between the pair of right linking rails. Likewise, the ladder also has a pair of left siderails rotatably connected to a pair of left siderails. The left top cap and the left steps are rotatably attached in between the pair of left siderails. The left top cap and the left steps are also rotatably attached in between the pair of left linking rails. Because the siderails, the steps, the linking rails are all rotatably attached to form the ladder, the ladder may be open and erected and also may be folded and collapsed to save space for storage and for carrying.

7. 发明授权

US09422768B2 Multifunctional ladder 有权
标题翻译：多功能梯
公开(公告)号：US09422768B2
公开(公告)日：2016-08-23
申请号：US14340150
申请日：2014-07-24
申请人： Thomas Yoo , Jong Deok Lim
发明人： Thomas Yoo , Jong Deok Lim
IPC分类号： E06C1/393 , E06C7/50 , E06C1/387
CPC分类号： E06C1/393 , E06C1/387 , E06C7/50
摘要： A combined stepladder and work platform assembly is provided. The assembly comprises a top frame having two side rails and footplate, a back frame pivotally attached to the back side of the top frame and having two side rails, and a front frame pivotally attached to the front side of the top frame and having two side rails. Link bars are provided so that they maintain steps horizontal together with the side rails of the front frame. Four braces secure the back frame and front frame with the top frame at a certain angle when the assembly is used as a work platform. The front frame, the top frame and the back frame form a triangular shape while the back frame is parallel to the floor when the assembly is used as a stepladder.
摘要翻译：提供组合式梯子和工作平台组件。该组件包括具有两个侧轨和底板的顶框架，可枢转地附接到顶框架的后侧并具有两个侧轨的后框架和可枢转地附接到顶框架的前侧的前框架，并且具有两个侧面轨道连接杆设置成使得它们与前框架的侧轨一起保持水平的台阶。当组件用作工作平台时，四个支架将顶框架与前框架以一定角度固定。当组件用作梯子时，前框架，顶框架和后框架形成三角形，而后框架平行于地板。

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