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1. 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

2. 发明申请

US20210262287A1 Ladder 有权
公开(公告)号：US20210262287A1
公开(公告)日：2021-08-26
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 rials 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.

3. 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.

4. 发明申请

US20200325726A1 Ladder With a Guardrail 审中-公开
公开(公告)号：US20200325726A1
公开(公告)日：2020-10-15
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.

5. 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.

6. 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.

7. 发明申请

US20200063493A1 LADDER WITH A GUARDRAIL 审中-公开
公开(公告)号：US20200063493A1
公开(公告)日：2020-02-27
申请号：US16107729
申请日：2018-08-21
申请人： Thomas YOO
发明人： Thomas YOO
IPC分类号： E06C7/18
摘要： A ladder with a guardrail is provided. The U-shaped guardrail has a center arm portion and two side arm portions. Each slot is provided through a side arm portion and has an elongated oval shape. Each hinge center bolt is disposed through a slot and engages a side arm portion to a hinge rotatably. The guardrail lock is disposed at the side arm portion, and the guardrail lock comprises first and second locks, a center rivet, a pair of stopper pins, and a torsion spring. The first or second lock has a guiding curve portion, a circular locking portion, and a through-hole. The center rivet is queued through the through-holes and fixes the first and second locks to the side arm portion rotatably and fixed to the side arm portion. The first and second locks receives and is locked to locking pins on top portions of the side rail.

8. 发明申请

US20190383100A1 Ladder 审中-公开
公开(公告)号：US20190383100A1
公开(公告)日：2019-12-19
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 , E06C1/18 , F16B7/10
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.

9. 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.

10. 发明申请

US20190390518A1 Ladder 审中-公开
公开(公告)号：US20190390518A1
公开(公告)日：2019-12-26
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 , F16C11/04 , E06C1/18
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.

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