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NTIS 바로가기국가/구분 | United States(US) Patent 등록 |
---|---|
국제특허분류(IPC7판) |
|
출원번호 | US-0866708 (1978-01-03) |
우선권정보 | FR-0000650 (1977-01-05); FR-0036458 (1977-11-25) |
발명자 / 주소 |
|
인용정보 | 피인용 횟수 : 16 인용 특허 : 1 |
A manhole cover is secured to a support ring by means of a latch member which is rotatable in a cavity formed in the manhole cover between a pair of upper and lower walls having respective upper and lower throughgoing apertures. The latch member is rotatable and has a lower end projecting through th
A latching arrangement for a manhole, said arrangement comprising: a disk-shaped manhole cover formed with a cavity and upper and lower throughgoing apertures opening into said cavity and both lying on a cavity axis along the periphery of the cover; a latching member rotatable in said cavity about s
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