|국가/구분||United States(US) Patent 등록|
|미국특허분류(USC)||280/645 ; 280/030 ; 280/047.29 ; 280/643 ; 182/021|
|발명자 / 주소|
|대리인 / 주소||
|인용정보||피인용 횟수 : 20 인용 특허 : 16|
A device for attaching to a ladder allows the ladder to function as a hand truck. The device includes a pair of retractable wheels. The retractable wheels can be stored away inside an outer profile of an opened or closed stepladder, so that the wheels do not interfere with a user when the ladder is opened and do not take up space when the ladder is closed. The device may also include a retractable carry platform for holding loads when the ladder is used as a hand truck. A reverse side of the carry platform can serve as a paint bucket support or work surf...
[ What is claimed is:] [1.]1. A combination comprising:a ladder including a plurality of steps, a first side rail and a second side rail;a base attached to at least one of said first or second side rails; andan assembly attached to said base proximate a top end of said ladder, said assembly including: a pivotable linkage, said pivotable linkage being pivotable between a first position and a second position relative to said base, and at least one wheel mounted to said pivotable linkage, wherein said at least one wheel is disposed between said first and se...