IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0900227
(2010-10-07)
|
등록번호 |
US-8888400
(2014-11-18)
|
발명자
/ 주소 |
- Nolle, Eric R.
- Sullivan, Jeffrey R.
|
출원인 / 주소 |
|
대리인 / 주소 |
|
인용정보 |
피인용 횟수 :
1 인용 특허 :
21 |
초록
▼
A corrosion-resistant self-locking manhole cover includes a cover plate adapted to rest on a manhole cover support surface of a manhole frame so as to be substantially flush with a top portion of the frame and a surrounding surface. An anchor on the cover plate, which may comprise nonmetallic corros
A corrosion-resistant self-locking manhole cover includes a cover plate adapted to rest on a manhole cover support surface of a manhole frame so as to be substantially flush with a top portion of the frame and a surrounding surface. An anchor on the cover plate, which may comprise nonmetallic corrosion-resistant material, is adapted to engage the manhole frame at a first location in a manner that resists lifting of the cover plate proximate to such location. A locking member on the cover plate, which may also comprise nonmetallic corrosion-resistant material, is movable between a locked position and an unlocked position. In the locked position, the locking member is adapted to engage the manhole frame at a second location in a manner that resists lifting of the cover plate proximate to such location. In the unlocked position, the locking member is disengaged from the manhole frame.
대표청구항
▼
1. A corrosion-resistant self-locking manhole cover, comprising: a cover plate comprising nonmetallic corrosion-resistant material adapted to rest on a manhole cover support surface of a manhole frame so as to be substantially flush with a top portion of said manhole frame and a surrounding surface
1. A corrosion-resistant self-locking manhole cover, comprising: a cover plate comprising nonmetallic corrosion-resistant material adapted to rest on a manhole cover support surface of a manhole frame so as to be substantially flush with a top portion of said manhole frame and a surrounding surface in which said manhole frame is situated;an anchor on said cover plate comprising nonmetallic corrosion-resistant material, said anchor being adapted to engage said manhole frame at a first location in a manner that resists lifting of said cover plate proximate to said first location;a locking member on said cover plate comprising nonmetallic corrosion-resistant material, said locking member being movable between a locked position in which said locking member is adapted to engage said manhole frame at a second location in a manner that resists lifting of said cover plate proximate to said second location, and an unlocked position in which said locking member is not adapted to engage said manhole frame; andmetallic components associated with said anchor and said locking member to perform mounting functions, rotary drive functions, and biasing functions, each of said metallic components comprising either a corrosion-resistant metal that is exposed to environmental gases or a metal that need not be corrosion-resistant but is sealed against exposure to environmental gases;wherein said support surface comprises an upper surface of an inwardly extending flange on said manhole frame and said anchor and said locking member are vertically adjustable to engage said manhole frame at or below a lower surface of said flange;wherein said anchor and said locking member are vertically adjustable to accommodate manhole frames with different flange depths; andwherein said anchor and said locking member are vertically adjustable between a first adjustment position wherein a first surface thereof is adapted to engage said manhole frame below said flange lower surface and a second adjustment position wherein said a second surface thereof is arranged to engage said flange lower surface of said manhole frame. 2. A manhole cover in accordance with claim 1, wherein said anchor and said locking member each comprise a rotatable manhole frame-engaging member providing said first surface and second surface, and wherein said first adjustment position and said second adjustment position are selected by rotating said frame-engaging member. 3. A corrosion-resistant self-locking manhole cover, comprising: a cover plate comprising nonmetallic corrosion-resistant material adapted to rest on a manhole cover support surface of a manhole frame so as to be substantially flush with a top portion of said manhole frame and a surrounding surface in which said manhole frame is situated;an anchor on said cover plate comprising nonmetallic corrosion-resistant material, said anchor being adapted to engage said manhole frame at a first location in a manner that resists lifting of said cover plate proximate to said first location;a locking member on said cover plate comprising nonmetallic corrosion-resistant material, said locking member being movable between a locked position in which said locking member is adapted to engage said manhole frame at a second location in a manner that resists lifting of said cover plate proximate to said second location, and an unlocked position in which said locking member is not adapted to engage said manhole frame; andmetallic components associated with said anchor and said locking member to perform mounting functions, rotary drive functions, and biasing functions, each of said metallic components comprising either a corrosion-resistant metal that is exposed to environmental gases or a metal that need not be corrosion-resistant but is sealed against exposure to environmental gases;wherein said support surface comprises an upper surface of an inwardly extending flange on said manhole frame and said anchor and said locking member are vertically adjustable to engage said manhole frame at or below a lower surface of said flange;wherein said anchor and said locking member are vertically adjustable to accommodate manhole frames with different flange depths; andwherein said anchor and said locking member each comprise a shaft that is rotatable about a central longitudinal shaft axis, and wherein said frame-engaging member comprises an oblong element situated at an end of said shaft. 4. A corrosion-resistant self-locking manhole cover, comprising: a cover plate comprising nonmetallic corrosion-resistant material adapted to rest on a manhole cover support surface of a manhole frame so as to be substantially flush with a top portion of said manhole frame and a surrounding surface in which said manhole frame is situated;an anchor on said cover plate comprising nonmetallic corrosion-resistant material, said anchor being adapted to engage said manhole frame at a first location in a manner that resists lifting of said cover plate proximate to said first location;a locking member on said cover plate comprising nonmetallic corrosion-resistant material, said locking member being movable between a locked position in which said locking member is adapted to engage said manhole frame at a second location in a manner that resists lifting of said cover plate proximate to said second location, and an unlocked position in which said locking member is not adapted to engage said manhole frame; andmetallic components associated with said anchor and said locking member to perform mounting functions, rotary drive functions, and biasing functions, each of said metallic components comprising either a corrosion-resistant metal that is exposed to environmental gases or a metal that need not be corrosion-resistant but is sealed against exposure to environmental gases;wherein said locking member is a first locking member and said anchor comprises a movable second locking member operatively connected to be movable in concert with said first locking member between a locked position in which said second locking member is adapted to engage said manhole frame, and an unlocked position in which said second locking member is not adapted to engage said manhole frame;wherein said second locking member is operatively connected to said locking member by way of a linkage;wherein said first and second locking members are driven by a rotatable drive mechanism on said cover plate that provides said rotary drive function, said rotatable drive mechanism comprising a rotatable security lock made of metal and sealed against exposure to environmental gases, and other drive components comprising nonmetallic corrosion-resistant material, said drive mechanism being offset from a center of said cover plate and having a first arm operatively connected to said first locking member, said drive mechanism further including a second arm operatively connected to said second locking member by way of said linkage, said drive mechanism having a locking rotational position wherein said first locking member and said second locking member are in said locked position and an unlocking rotational position wherein said first locking member and said second locking member are in said unlocked position; andwherein said first locking member is mounted on a first locking member support element that engages said first arm and said second locking member is mounted on a second locking member support element that connects to said second arm through a link member that comprises said linkage. 5. A manhole cover in accordance with claim 4, wherein said first locking member is mounted for rotation on said first locking member support element and said second locking member is mounted for rotation on said second locking member support element, and wherein said first locking member and second locking member are configured to engage different portions of a same manhole frame or different manhole frames of different configuration according to their rotational position. 6. A manhole cover in accordance with claim 5, wherein said first locking member support element is slidably mounted on a first locking mechanism and said second locking member support element is slidably mounted on a second locking mechanism. 7. A manhole cover in accordance with claim 6, wherein said first locking mechanism and said second locking mechanism each comprise a front tower, a rear tower and at least one guide shaft on which said first locking member support element and said second locking member support element are slidably mounted. 8. A manhole cover in accordance with claim 7, wherein said first locking member slidably engages said front tower of said first locking mechanism and said second locking member slidably engages said front tower of said second locking mechanism. 9. A manhole cover in accordance with claim 8, wherein said first locking member is biased by a first locking member spring disposed on said guide shaft of said first locking mechanism and said second locking member is biased by a first locking member spring disposed on said guide shaft of said second locking mechanism. 10. A manhole cover in accordance with claim 9, wherein said first locking member spring is disposed between said first locking member support element and said rear tower of said first locking mechanism, and said second locking member spring is disposed between said second locking member support element and said rear tower of said second locking mechanism. 11. A manhole cover in accordance with claim 10, wherein said guide shaft of said first locking mechanism and said guide shaft of said second locking mechanism comprise opposite ends of a common interconnecting structure that interconnects said first locking mechanism and said second locking mechanism. 12. A manhole cover in accordance with claim 11, wherein there are a pair of said first locking guide shafts and a pair of said second guide shafts. 13. A manhole cover in accordance with claim 12, wherein there are a pair of said locking member springs respectively carried on said pair of guide shafts of said first locking mechanism, and a pair of said locking member springs respectively carried on said pair of guide shafts of said second locking mechanism. 14. A manhole cover in accordance with claim 13, wherein said linkage extends under a portion of said second locking mechanism.
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