Patent US3957247A successfully refreshed from Google Patents.
US3957247A
Expired / Lapsed
US
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Method for lifting a manhole cover
Assignee: DIVERSIFIED PRODUCTS & ENGINEERING Inc 4727 LOLLY DR MONROEVILLE PA 15146 A PA CORP
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Filing: 1975-03-25
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Granted: 1976-05-18
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Expires: 1995-03-25
Abstract
Abstract A method and apparatus are disclosed for lifting a manhole cover. The apparatus comprises a means for engaging the manhole cover which cooperates with a means for raising and lowering the manhole cover. A pivot means is also provided which cooperates with the means for raising and lowering the manhole cover. According to the method of the invention the pivot means is positioned adjacent one edge of the manhole cover. A lifting means is engaged with the manhole cover and a bar is placed in engagement with the pivot means and the lifting means. Pressure is applied to one end of the bar and the manhole cover is lifted to a position to allow pivoting the manhole cover to a desired position prior to lowering.
Inventors
- 👤 George S. Haller
- 👤 Theodore C. Uphoff
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 01:01
CPC Classifications
B; B66; B66F; B66F19/00; B66F19/005
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
279 words
A method of raising and lowering a manhole cover from a manhole comprising the steps of: a. positioning a pivot means adjacent one edge of said manhole cover, said pivot means being stationary with respect to said one edge of said manhole cover; b. providing a means for engaging said manhole cover near the center so that said manhole cover will be raised generally vertical with respect to ground level, said means for engaging said manhole cover comprises a pad, having a width W slightly less than a width W 1 of an opening near the center of said manhole cover, said pad having a lifting means secured near one edge, and said lifting means having a bushing slidably mounted thereon, said bushing having a width W 2 slightly less than said width W 1 of said opening in said manhole cover; c. inserting said pad and a portion of said lifting means through said opening in said manhole cover; d. centering said portion of said lifting means in said opening so that said bushing slides into the annulus formed by said opening and said portion of said lifting means; e. placing a lever in bearing engagement with said pivot means and in lifting engagement with said lifting means; f. applying pressure to one end of said lever to bring the top of said pad into contact with the bottom of said manhole cover and continuing to apply pressure until said manhole cover is above said ground level; g. pivoting said manhole cover to a desired position; and h. lowering said manhole cover to said ground level by releasing said pressure applied to said one end of said lever.
Claim 2
Independent Claim
279 words
A method of raising and lowering a manhole cover from a manhole comprising the steps of: a. positioning a pivot means adjacent one edge of said manhole cover, said pivot means being stationary with respect to said one edge of said manhole cover; b. providing a means for engaging said manhole cover near the center so that said manhole cover will be raised generally vertical with respect to ground level, said means for engaging said manhole cover comprises a pad, having a width W slightly less than a width W 1 of an opening near the center of said manhole cover, said pad having a lifting means secured near one edge, and said lifting means having a bushing slidably mounted thereon, said bushing having a width W 2 slightly less than said width W 1 of said opening in said manhole cover; c. inserting said pad and a portion of said lifting means through said opening in said manhole cover; d. centering said portion of said lifting means in said opening so that said bushing slides into the annulus formed by said opening and said portion of said lifting means; e. placing a lever in bearing engagement with said pivot means and in lifting engagement with said lifting means; f. applying pressure to one end of said lever to bring the top of said pad into contact with the bottom of said manhole cover and continuing to apply pressure until said manhole cover is above said ground level; g. pivoting said manhole cover to a desired position; and h. lowering said manhole cover to said ground level by releasing said pressure applied to said one end of said lever.
Claim 3
Dependent Claim
40 words
A method according to claim 1 including the additional steps of: a. after step (g) repeating step (f); b. pivoting said manhole cover over the opening in said manhole; and c. lowering said manhole cover to its final resting place.
Claim 4
Dependent Claim
46 words
A method according to claim 2 including the additional step of placing a stop means in contact with said lifting means to prevent said lifting means from slipping on said lever so that said manhole cover will be automatically aligned with said opening in said manhole.
References Cited (Backward Citations)
US339591A
Cited
US2655399A
Cited
US3091983A
Cited
US3198362A
Cited
US3270407A
Cited
FR1438529A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-05-18 | 1979-11-17 | 1980-05-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-05-18 | 1983-11-17 | 1984-05-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-05-18 | 1987-11-17 | 1988-05-18 | $7700.00 | Window Closed / Lapsed |