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NTIS 바로가기국가/구분 | United States(US) Patent 등록 |
---|---|
국제특허분류(IPC7판) |
|
출원번호 | US-0170115 (1980-07-18) |
우선권정보 | CA-0351629 (1980-05-09) |
발명자 / 주소 |
|
인용정보 | 피인용 횟수 : 3 인용 특허 : 2 |
A novel safety platform for use in a vertical shaft such as a manhole. The platform comprises a pair of support beams with the ends of each support beam mounted in the wall of the shaft. At least one panel extends across the shaft and bridges the support beams with a novel wedge clip at one end of t
A safety platform for use in a vertical shaft defined by a wall, said platform comprising: (a) a pair of support beams, each support beam having two ends which are mounted in the inner surface of said wall; (b) at least one panel which extends across the shaft and which bridges said support beams; (
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