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NTIS 바로가기국가/구분 | United States(US) Patent 등록 |
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국제특허분류(IPC7판) |
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출원번호 | US-0291716 (1994-08-17) |
발명자 / 주소 |
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인용정보 | 피인용 횟수 : 54 인용 특허 : 0 |
A lift apparatus is provided for raising or lowering objects through an opening in a ceiling which has associated ceiling supports, such as ceiling joists. The lift apparatus includes a frame, mounted to and supported by the ceiling supports, having first and second frame members, and a third frame
A lift apparatus for raising or lowering objects relative to a ceiling which is at a vertical level herein denoted as ceiling level, wherein the ceiling has a ceiling support means associated therewith and an opening therethrough having opposing sides, said lift apparatus comprising: a receptacle, f
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