GB2061218A - A manhole cover lifting device - Google Patents
A manhole cover lifting device Download PDFInfo
- Publication number
- GB2061218A GB2061218A GB7936162A GB7936162A GB2061218A GB 2061218 A GB2061218 A GB 2061218A GB 7936162 A GB7936162 A GB 7936162A GB 7936162 A GB7936162 A GB 7936162A GB 2061218 A GB2061218 A GB 2061218A
- Authority
- GB
- United Kingdom
- Prior art keywords
- manhole cover
- lifting device
- support structure
- jacking
- cover lifting
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66F—HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
- B66F19/00—Hoisting, lifting, hauling or pushing, not otherwise provided for
- B66F19/005—Lifting devices for manhole covers
Abstract
A manhole cover lifting device comprising a T-shaped support structure 1, separable and laterally adjustable wheels 5, a separable and foldable handle 16 and a separable lifting means 10. The lifting means comprise a jacking device 11 and chains 14 connected thereto. The length of the chains is adjustable to permit the device to lift manhole covers of different sizes and to take up slack prior to lifting. In use the device is wheeled over the cover and the chains engaged with it by means 15. Slack in chains 14 can then be taken up, after which the jacking device is raised until the manhole cover is held beneath the support structure to restrict relative movement between the cover and the lifting device during subsequent displacement of the device with the cover. <IMAGE>
Description
SPECIFICATION
A manhole cover lifting device
Field of the invention
This invention relates to a manhole cover lifting device and is particularly concerned with such a device which can be positioned over the manhole cover for lifting it, and when the cover is supported clear of the ground the device can be displaced to relocate the manhole cover.
Background art
Manhole cover lifting devices are known but these known devices are not believed to provide a particularly stable arrangement when a manhole cover is being displaced with the device. Thus, manhole covers are known to be relatively heavy, made for example in cast iron or concrete, and any movement relative to the lifting device as the device is displaced may cause the device itself to become unstable and thereby topple over, potentially causing a considerable hazard.
Statement ofinvention According to a first aspect of the present invention there is provided a manhole cover lifting device comprising a support structure that is movable in a generally longitudinal direction on laterally spaced displacement members, handle means enabling manual displacement of the support structure on the displacement members, and lifting means carried by the support structure and comprising a jacking device with an upwardly extendible jacking portion and a plurality of inextendible elongate members each connected to the upwardly extendible jacking portion and connectable to a manhole cover to lift the manhole cover when the jacking device is actuated to extend the jacking portion upwardly, the arrangement of the lifting device and the elongate members being such that, with two or the two elongate members extending in use on respective sides of at least a portion of the support structure in connection with a manhole cover, the jacking portion is extendible to draw the manhole cover up against the underside of the support structure to rigidly hold the manhole cover during displacement of the support structure.
By this aspect of the present invention, the manhole cover can be safely secured against the support structure to prevent movement therebetween and thereby facilitate safe displacement of the lifting device and the cover.
Preferably, the portions of the elongate members connectable to the manhole cover are substantially universally movable relative to the jacking portion so that the manhole cover may take up a balanced position beneath the jacking device as it is being raised. The elongate members may thus, for example, be pivotally connected to the jacking portion and/orthey may be flexible. Conveniently, the elongate members comprise chains; and the supporting length of the elongate members may be selectively adjustable to permit maximum lift to be obtained by the jacking device. Key holes are generally provided on the manhole cover in which case the elongate members may include keying means for engagement therewith.Where the elongate members are in the form of chains, such keying means may be connected to the chains by shackles, and adjustment of the supporting length of each chain can be by moving the shackle from one link to another. Usually four elongate members will be provided to facilitate balanced lifting of the manhole cover.
The handle means is preferably movable between a storage condition and a lifting condition and conveniently is pivotally connected relative to the support structure whereby it may be folded to substantially overlie the support structure in its storage condition. The handle means should be lockable in the lifting condition, when it conveniently extends generally longitudinally of the support structure.
In a preferred embodiment the support structure comprises a T-piece with the laterally spaced displacement members carried by the cross-piece of the "T". The spacing of the displacement members, which are preferably ground-engaging wheels, may be adjustable to span manhole covers of different sizes and the displacement members may be removable from the cross-piece. The jacking device is conveniently supported on the upper surface of the
T-piece centrally between the displacement members and at or adjacent the junction of the crosspiece and tail-piece of the "T". The handle means may comprise a portion which is slidable into or over the tail-piece and lockable relative thereto to provide a rigid connection. If the handle means is pivotable relative to the support structure, a hand-engaging portion can be pivotally connected to the slidable portion of the handle means.A ground engaging member may depend from the handle means to maintain the support structure in a preselected angular position during lifting of the manhole cover.
The jacking device may be separable from the support structure and conveniently comprises a double-acting hydraulic jack.
According to a second aspect of the present invention there is provided a manhole cover lifting device comprising a support structure that is movable in a generally longitudinal direction on laterally spaced displacement members, handle means enabling manual displacement of the support structure on the displacement members, and lifting means carried by the support structure and comprising a jacking device with an upwardly extendible jacking portion and a plurality of inextendible elongate members each connected to the jacking portion with a remote and freely movable relative to the jacking portion and connectable to a manhole cover to lift the manhole cover when the jacking device is actuated to extend the jacking portion upwardly.
Brief description of the drawings
One embodiment of a manhole cover lifting device in accordance with the present invention will now be described by way of example only, with reference to the accompanying drawings, in which:
Figure 1 is a perspective view of the embodiment, and
Figure 2 is a schematic view similar two part of
Figure 1, but showing the support structure with a manhole cover drawn up against its underside.
Detailed description of the drawings
The manhole cover lifting device shown in the drawings comprises a T-shaped support structure 1 having a cross-piece 2 and a tail-piece 3 both formed of rectangular cross-section tubular material such as steel. The cross-piece 2 carries spaced wheelsupporting members 4 which each have a ground engaging wheel 5. The members 4 are slidable over the cross-piece 2 to a position in which they span a manhole cover, such as the cover 6 shown in Figure 2, and are lockable in position by, for example, pins 7. Preferably the members 4 are spaced equally from the tail-piece 3.
The tail-piece 3 is relatively short and has a slide 8, which may be welded thereto, adjacent the crosspiece 2 and with which is fixedly engageable a slide member 9 of lifting means 10. The slide member 9 comprises a plate which is fixed, such as by welding, to the bottom of a jacking device 11 forming part of the lifting means. The jacking device 11 comprises a jacking portion 12 which is upwardly extendible when the jacking device is actuated. The jacking device is conveniently a manually operated doubleacting hydraulic jack. Connected to the uppermost end of the jacking portion 12 is a plate member 13, which may be fixed or rotatable relative thereto, to which are connected four inextendible elongate members 14 in the form of chains.
Each chain has connected at its remote end keying means 15 which is engageable with a keyhole (not shown) in a manhole cover. If the manhole cover has only two keyholes, only two of the chains need be used. The length of the chains may be adjusted to cater for differently spaced keyholes by either changing the keying means 15 from one chain link to another, or by connecting the plate member 13 to a different chain link. The keying means 15 of each chain is effectively joined to the plate member 13 through a universal coupling consisting ofthe flexible chain, thereby facilitating easy adjustment during connection to the manhole cover; that is, the lifting device need not be very accurately aligned over the manhole cover.It will be appreciated that the effectively universal coupling may also be provided by substantial rigid elongate members which are connected to the plate member 13 through a loose coupling.
Handle means 16 is engaged with the tail-piece 3 by sliding an elongate rigid piece 17 into the end of the tail-piece 3 and locking it my means of a pin or bolt 18. Pivotally connected to the other end of the rigid piece 17 is a hand-engaging member 19 which is cranked at 20 for a convenient height. The member 19 is pivotable as shown by arrow 21 to overlie the rigid piece 17 and the tailpiece 3 in a storage condition, and in the lifting condition shown is locked by a pin 22 to give a rigid connection between the member 19 and the support structure 1. A ground-engaging member 23 is carried at the said other end of the rigid piece 17 to maintain the rigid piece and the cross-piece 2 at approximately the same height from the ground when the support structure is not being lifted by the handle means 16.
In use, the lifting device is wheeled over a manhole cover 6 and two or four of the keying means 15 are connected to the cover. Where only two are utilized, it is preferably those connected to the chains which bridge the tail-piece 3 that are used to balance the device during lifting of the cover.
Where four chains are used two will extend on each side of the cross-piece 2. The length of the chains may be adjusted, if necessary, before or after connection to the cover 6 to take up any slack. The cover 6 is then lifted by raising the jacking portion 12 ofthedouble-acting hydraulic jack in known man new as soon as the cover is clear of the ground it will automatically centralise itself beneath the support structure 1, if necessary; it will be appreciated that the length of the two sets of chains (if four are used) on each side of the cross-piece 2 may differ to provide the most convenient centralising. The jacking device 11 is actuated further to draw the cover 6 up against the underside of the support structure 1 as shown in Figure 2, and thereby provide substantially rigid support between the lifting device and the cover 6. The advantage of taking up slack in the chains before actuating the jacking device is that the minimum amount of displacement of the jacking portion 12 is then required. With the cover engaged against the support structure 1 (perhaps with cushioning therebetween) the lifting device may be moved by lifting the ground-engaging member 23 and pushing or pulling on the handle means 16 for displacement on the wheels 5.
In the above-described embodiment, the wheel support members 4, the lifting means 10 and the folding handle means 16 may all be separated individually from the support structure 1 for ease of storage and transport.
By the term "inextendible" as used with reference to the elongate members 14, it will be understood that this relates to the length of the members 14 in use. The length is conveniently adjustable as described above.
Claims (30)
1. A manhole cover lifting device comprising a support structure that is movable in a generally longitudinal direction on laterally spaced displacement members, handle means enabling manual displacement of the support structure on the displacement members, and lifting means carried by the support structure and comprising a jacking device with an upwardly extendible jacking portion and a plurality of inextendible elongate members each connected to the upwardly extendible jacking portion and connectable to a manhole coverto lift the manhole cover when the jacking device is actuated to extend the jacking portion upwardly, the arrangement of the lifting device and the elongate members being such that, with two or the two elongate members extending in use on respective sides of at least a portion of the support structure in connection with a manhole cover, the jacking por tion is extendible to draw the manhole cover up against the underside of the support structure to rigidly hold the manhole cover during displacement of the support structure.
2. A manhole cover lifting device as claimed in claim 1 in which the elongate members are substantially universally movable relative to the jacking portion.
3. A manhole cover lifting device as claimed in claim 2 in which the elongate members are pivotally connected to the jacking portion.
4. A manhole cover lifting device as claimed in claim 2 or claim 3 in which the elongate members are flexible.
5. A manhole cover lifting device as claimed in claim 4 in which the elongate members comprise chains.
6. A manhole cover lifting device as claimed in any one of the preceding claims in which the supporting length of the elongate members is selectively adjustable.
7. A manhole cover lifting device as claimed in claim 6 when dependent from claim 5 in which each elongate member comprises means for connection to the manhole cover, such means being connected to the chain by a releasable shackle to permit said adjustment.
8. A manhole cover lifting device as claimed in any one of the preceding claims in which, in use, the elongate members are pivotable together about an upwardly extending axis and relative to the support structure.
9. A manhole cover lifting device as claimed in claim 8 in which the elongate members are con nectedtoa plate portion of the jacking device, provided at an upper end of the jacking portion and wherein said plate portion is pivotable about said axis relative to the remainder of the jacking device.
10. A manhole cover lifting device as claimed in any one of the preceding claims in which there are four elongate members.
11. A manhole cover lifting device as claimed in any one of the preceding claims in which the jacking device is separable from the support structure.
12. A manhole cover lifting device as claimed in any one of the preceding claims in which the jacking device comprises a double-acting hydraulic jack.
13. A manhole cover lifting device as claimed in any one of the preceding claims in which the handle means is movable between a lifting condition and a storage condition.
14. A manhole cover lifting device as claimed in claim 13 in which the handle means is lockable in the lifting condition.
15. A manhole cover lifting device as claimed in claim 13 or claim 14 in which in the lifting condition the handle means extends generally longitudinally of the support structure.
16. A manhole cover lifting device as claimed in any one of claims 13 to 15 in which the handle means is pivotally connected relative to the support structure whereby it may be folded to substantially overlie the support structure in the storage condition.
17. A manhole cover lifting device as claimed in any one of the preceding claims in which the handle means is separable from the support structure.
18. A manhole cover lifting device as claimed in claim 17 when dependent from claim 16 in which the handle means comprises a portion which is slidably engageable with the support structure and lockable relative thereto to provide a rigid connection, and a hand-engaging portion which is pivotally connected to the slidable portion.
19. A manhole cover lifting device as claimed in any one of the preceding claims which includes a ground-engaging member to maintain the support structure in a preselected angular position during lifting of the manhole cover.
20. A manhole cover lifting device as claimed in claim 19 in which the ground-engaging member depends from the handle means.
21. A manhole cover lifting device as claimed in any one of the preceding claims in which the lateral spacing of the displacement members is adjustable.
22. A manhole cover lifting device as claimed in any one of the preceding claims in which the displacement members are equally spaced laterally of the jacking device.
23. A manhole cover lifting device as claimed in any one of the preceding claims in which the displacement members comprise ground-engaging wheels.
24. A manhole cover lifting device as claimed in any one of the preceding claims in which the support structure comprises a T-piece with the laterallyspaced displacement members carried by the crosspiece of the T.
25. A manhole cover lifting device as claimed in claim 24 in which the jacking device is supported on the upper surface of the T-piece at or adjacent the junction of the cross-piece and the tail-piece.
26. A manhole cover lifting device as claimed in claim 25 when claim 24 is dependent from claim 11 or any claim appendent thereto in which the tailpiece comprises a slide with which the jacking device is removably engageable.
27. A manhole cover lifting device as claimed in any one of claims 24to 26 in which the handle means extends from the tail-piece.
28. A manhole cover lifting device as claimed in any one of claims 24 to 27 in which the displacement members are separable from the cross-piece.
29. A manhole cover lifting device comprising a support structure that is movable in a generally longitudinal direction on laterally spaced displacement members, handle means enabling manual displacement of the support structure on the displacement members, and lifting means carried by the support structure and comprising a jacking device with an upwardly extendible jacking portion and a plurality of inextendible elongate members each connected to the jacking portion with a remote end freely movable relative to the jacking portion and connectable to a manhole coverto lift the manhole cover when the jacking device is actuated to extend the jacking portion upwardly.
30. A manhole cover lifting device substantially as herein described with reference to the accompanying drawings.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB7936162A GB2061218A (en) | 1979-10-18 | 1979-10-18 | A manhole cover lifting device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB7936162A GB2061218A (en) | 1979-10-18 | 1979-10-18 | A manhole cover lifting device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB2061218A true GB2061218A (en) | 1981-05-13 |
Family
ID=10508590
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB7936162A Withdrawn GB2061218A (en) | 1979-10-18 | 1979-10-18 | A manhole cover lifting device |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB2061218A (en) |
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2563823A1 (en) * | 1984-05-04 | 1985-11-08 | Electricite De France | Device for lifting plates, particularly covers for inspection holes |
| DE3802034A1 (en) * | 1988-01-25 | 1989-08-03 | Werner Cielker | Apparatus for moving manhole covers |
| GB2219984A (en) * | 1988-06-21 | 1989-12-28 | Peter David Irish | A manhole cover lifter |
| EP0378365A2 (en) * | 1989-01-12 | 1990-07-18 | Alan Lawrence Carr | Lifting appliance |
| US4982930A (en) * | 1988-09-16 | 1991-01-08 | Stewart John V | Sidewalk lifter |
| FR2679544A1 (en) * | 1991-07-26 | 1993-01-29 | Pouyaud Daniel | Autonomous (self-contained) equipment making it possible to extract and move elements which are set into the ground, such as manhole covers, gratings |
| USRE35239E (en) * | 1989-05-16 | 1996-05-14 | J.M. Huber Corporation | Endothermic blowing agents compositions and applications |
| USRE35368E (en) * | 1989-05-16 | 1996-10-29 | J. M. Huber Corporation | Endothermic blowing agents for surface migration of components in foamed products, compositions and applications |
| USRE35447E (en) * | 1989-05-16 | 1997-02-11 | J. M. Huber Corporation | Endothermic blowing agents for strengthening weld lines in molded thermoplastic resins and products |
| GB2456629A (en) * | 2008-01-17 | 2009-07-22 | Dudley Thomas Ltd | A lifting device with a foldable handle |
| CN104016276A (en) * | 2014-06-24 | 2014-09-03 | 国家电网公司 | Vehicle for opening and transporting cable inspection well lids |
| CN111791041A (en) * | 2020-07-27 | 2020-10-20 | 郭庆文 | Automatic well lid dismounting robot for municipal works |
| CN112875581A (en) * | 2020-12-14 | 2021-06-01 | 申继伦 | Laborsaving removal municipal administration device for well lid |
-
1979
- 1979-10-18 GB GB7936162A patent/GB2061218A/en not_active Withdrawn
Cited By (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2563823A1 (en) * | 1984-05-04 | 1985-11-08 | Electricite De France | Device for lifting plates, particularly covers for inspection holes |
| DE3802034A1 (en) * | 1988-01-25 | 1989-08-03 | Werner Cielker | Apparatus for moving manhole covers |
| GB2219984A (en) * | 1988-06-21 | 1989-12-28 | Peter David Irish | A manhole cover lifter |
| GB2219984B (en) * | 1988-06-21 | 1992-07-15 | Peter David Irish | Manhole cover lifter |
| US4982930A (en) * | 1988-09-16 | 1991-01-08 | Stewart John V | Sidewalk lifter |
| EP0378365A2 (en) * | 1989-01-12 | 1990-07-18 | Alan Lawrence Carr | Lifting appliance |
| EP0378365A3 (en) * | 1989-01-12 | 1990-10-03 | Alan Lawrence Carr | Lifting appliance |
| USRE35239E (en) * | 1989-05-16 | 1996-05-14 | J.M. Huber Corporation | Endothermic blowing agents compositions and applications |
| USRE35368E (en) * | 1989-05-16 | 1996-10-29 | J. M. Huber Corporation | Endothermic blowing agents for surface migration of components in foamed products, compositions and applications |
| USRE35447E (en) * | 1989-05-16 | 1997-02-11 | J. M. Huber Corporation | Endothermic blowing agents for strengthening weld lines in molded thermoplastic resins and products |
| FR2679544A1 (en) * | 1991-07-26 | 1993-01-29 | Pouyaud Daniel | Autonomous (self-contained) equipment making it possible to extract and move elements which are set into the ground, such as manhole covers, gratings |
| GB2456629A (en) * | 2008-01-17 | 2009-07-22 | Dudley Thomas Ltd | A lifting device with a foldable handle |
| CN104016276A (en) * | 2014-06-24 | 2014-09-03 | 国家电网公司 | Vehicle for opening and transporting cable inspection well lids |
| CN104016276B (en) * | 2014-06-24 | 2016-02-10 | 国家电网公司 | Cable manhole cover starts shipment car |
| CN111791041A (en) * | 2020-07-27 | 2020-10-20 | 郭庆文 | Automatic well lid dismounting robot for municipal works |
| CN111791041B (en) * | 2020-07-27 | 2021-06-15 | 浙江辛巴达机器人科技有限公司 | Automatic well lid dismounting robot for municipal works |
| CN112875581A (en) * | 2020-12-14 | 2021-06-01 | 申继伦 | Laborsaving removal municipal administration device for well lid |
| CN112875581B (en) * | 2020-12-14 | 2022-09-16 | 新疆大英建设集团有限公司 | Laborsaving removal municipal administration device for well lid |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| WAP | Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1) |