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WO1997037086A1 - Systeme pour le montage d'une trappe d'acces - Google Patents

Systeme pour le montage d'une trappe d'acces Download PDF

Info

Publication number
WO1997037086A1
WO1997037086A1 PCT/GB1997/000887 GB9700887W WO9737086A1 WO 1997037086 A1 WO1997037086 A1 WO 1997037086A1 GB 9700887 W GB9700887 W GB 9700887W WO 9737086 A1 WO9737086 A1 WO 9737086A1
Authority
WO
WIPO (PCT)
Prior art keywords
course
frame
top surface
wear
main frame
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.)
Ceased
Application number
PCT/GB1997/000887
Other languages
English (en)
Inventor
David John Drake Hawkins
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
CSR Ltd
CSR Ltd
Original Assignee
CSR Ltd
CSR Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by CSR Ltd, CSR Ltd filed Critical CSR Ltd
Priority to AU22986/97A priority Critical patent/AU727064B2/en
Priority to IL12638797A priority patent/IL126387A/en
Priority to DE69708854T priority patent/DE69708854T2/de
Priority to NZ332095A priority patent/NZ332095A/xx
Priority to EP97915549A priority patent/EP0890001B1/fr
Priority to AT97915549T priority patent/ATE210228T1/de
Publication of WO1997037086A1 publication Critical patent/WO1997037086A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D29/00—Independent underground or underwater structures; Retaining walls
    • E02D29/12—Manhole shafts; Other inspection or access chambers; Accessories therefor
    • E02D29/14—Covers for manholes or the like; Frames for covers
    • E02D29/1409—Covers for manholes or the like; Frames for covers adjustable in height or inclination

Definitions

  • the present invention relates to a device for mounting an access cover, such as a manhole cover, in a wearing surface.
  • wearing surface any surface, such as roads and pavements, which require periodic resurfacing.
  • Access covers are a common feature of road and pavement surfaces and provide access to underground services and installations, such as sewage, telephone, electrical, gas and water installations.
  • the access cover generally resides in a supporting frame which is formed from cast iron and extends down into the foundations beneath the road or pavement and may be set therein with concrete or a similar material.
  • the level at which the frame is set into the foundation is chosen such that, with the access cover residing in the frame, the upper surface of the access cover lies substantially flush with the road surface. Due to wear from traffic, road and pavement surfaces require periodic resurfacing.
  • Resurfacing of the wearing surface may be effected either by planing down the original surface followed by laying a new surface at substantially the same level as the original surface or by simple laying a new surface on the existing surface.
  • the present invention provides a device for mounting an access cover in a wearing surface, for example a road surface, having a wear course overlying a base course, the device comprising a service frame in which the cover is removably received and a main frame for mounting below the base course, wherein the service frame is movable to a plurality of positions relative to the main frame including a first position at which, in use, a top surface of the access cover is substantially flush with the top surface of the wearing course and a second position at which, in use, the top surface of the access cover is substantially flush with the bottom surface of the base course.
  • the service frame is supported on the main frame by support means.
  • the support means are preferably adjustable and/or removable. In this case, adjustment and/or removal of the support means enables the service frame to be moved relative to the main frame to a plurality of positions including the first and second positions.
  • a device for mounting an access cover in a wearing surface for example a road surface, having a wear course overlying a base course
  • the device comprising a service frame in which the cover is removably received, a main frame for mounting below the base course, and support means to support the service frame on the main frame at a first position at which, in use, a top surface of the access cover is substantially flush with the top surface of the wearing course, wherein removal and/or adjustment of the support means enables the service frame to be moved relative to the main frame to a second position at which, in use, the top surface of the access cover is substantially flush with the bottom surface of the base course.
  • the service frame is preferably an open annular or rectangular frame having at a base thereof an outwardly extending flange.
  • the service frame typically has a height of from about 8cm to 18cm, more typically from about 10cm to about 16cm.
  • the access cover is preferably removably received in the service frame, but may also be hingedly connected thereto.
  • the main frame is preferably an open annular or rectangular frame having at a base thereof an inwardly extending flange.
  • the main frame surrounds the service frame at the second position. More than one main frame may be provided depending on the depth of the access hole. In this case the two or more main frames are preferably designed to be stackable on top of one another. It will be appreciated that the distance the main frame extends vertically may be adjusted by providing grout, cement or other packing material between a bottom surface thereof and the ground therebelow.
  • the support means comprises one or more collars, preferably disposed between an upper surface of the flange of the main frame and a lower surface of the flange of the service frame.
  • the height of the one or more collars relative to the main frame may be adjusted by providing grout, cement or other packing material between a bottom surface thereof and the upper surface of the flange of the main frame.
  • the one or more collars may comprise separable segments.
  • the height of the service frame relative to the support means may be adjusted by providing grout, cement or other packing material between a bottom surface thereof and an upper surface of the support means.
  • the support means preferably further comprises a height-adjustable spacer element.
  • the height-adjustable spacer element preferably comprises a collar and wedge arrangement, a collar having one or more adjustable screws running therethrough, or one or more hydraulic jacks or rams or a combination thereof.
  • the device according to the present invention may further comprise one or more extension collars located on a top portion of the main frame and/or one or more spacer elements located on a top portion of the service frame.
  • the vertical distance between the top surface of the access cover at the first position and the top surface thereof at the second position is preferably from about 6cm to about 14cm, more preferably from about 8cm to about 12cm, still more preferably about 10cm. Accordingly, in moving from the first position to the second position, the service frame is displaced by a vertical distance of preferably from about 6cm to about 14cm.
  • the present invention also provides for a method of resurfacing a wearing surface having a wear course overlying a base course, wherein a device as herein described is sited in the wearing surface, the method comprising the steps of:
  • the present invention provides a method of laying a new wear surface on a wearing surface having a wear course overlying a base course, wherein a device as herein described is sited in the wearing surface, the method comprising the steps of: (a) moving the service frame to a level at which the top surface of the access cover will be substantially flush with the top surface of the new wear course to be laid; and (b) laying the wear course.
  • the present invention also provides for a method of resurfacing a wearing surface having a wear course overlying a base course, wherein a device as herein described and comprising support means is sited in the wearing surface, the method comprising the steps of: (a) adjusting and/or removing the support means such that the service frame is in the second position; (b) planing down the wear and base courses to the desired depth;
  • the present invention also provides for a method of laying a new wear surface on a wearing surface having a wear course overlying a base course, wherein a device as herein described and comprising support means is sited in the wearing surface, the method comprising the steps of:
  • the device as herein described can be substituted for existing conventional devices when the time comes to resurface a road or pavement, for example. All that is required is for a template to be placed over the existing manhole frame and for the road or pavement layers to be cut to the desired depth. Thereafter, the manhole brickwork and arisings can be removed and the new device positioned in place in the manner as described above.
  • Figure 1 is a schematic vertical cross-sectional half view of a device according to the present invention
  • Figure 2 is a plan view of a collar of the height-adjustable spacer element of the support means
  • Figure 3 is a vertical cross-section through line AA' of the plan view illustrated in Figure 2 showing tapered recesses in the collar of the height- adjustable spacer element;
  • Figure 4 is a plan view of an alternative base collar of the support means
  • Figure 5 is a vertical cross-sectional illustration of a main frame for use with the base collar of Figure 4;
  • Figure 6 is a plan view of an alternative main frame according to the present invention which is adapted to be stackable
  • Figure 7 is a vertical cross-section through line BB' of the plan view illustrated in Figure 6;
  • Figure 8 is a plan view of an alternative support means collar for use with the main frame illustrated in Figures 6 and 7.
  • a device 1 according to the present invention is shown sited in a road 5.
  • the vertical cross-sectional view shows one half of the device 1 and the other half is simply a mirror image of this half about the dashed centre line of the access hole 15.
  • the device 1 comprises a main frame 20 formed from concrete and having an open rectangular form with an upwardly extending wall portion 21 and an inwardly extending flange portion 22 at its base.
  • the main frame 20 has a squarish/rectangular horizontal cross- section (not shown) and the wall portion 21 thereof surrounds the access hole 15.
  • a ridge 23 extends around the upper surface 24 of the wall portion 21 of the main frame 20 such that the outer top edge 25 is at a higher level than the inner top edge 26.
  • the main frame 20 sits on a service chamber 6 and the remainder of the road 5 consists of a wear course 7 (approximately 4cm depth) overlying a base course 8 (approximately 6cm depth) , beneath which is a sub-base course 9.
  • a wear course 7 approximately 4cm depth
  • a base course 8 approximately 6cm depth
  • sub-base course 9 may themselves each comprise a plurality of layers.
  • a first extension collar 30 is located on the upper surface 24 of the wall portion 21 of the main frame 20.
  • the first extension collar 30 extends upwards from the sub-base course 9 to the top 10 of the base course 8 and has a similar horizontal cross- section (not shown) to that of the main frame 20.
  • the first extension collar 30 is removably located on the main frame 20 by virtue of a ridge 31 provided around its base 32, which cooperates with the ridge 23 on the upper surface 24 of wall portion 21.
  • a ridge 33 around the upper surface 34 of the first extension collar 30 is also provided.
  • Removably located on the upper surface 34 of the first extension collar 30 is an optional second extension collar 40, again of similar horizontal cross-section (not shown) to that of the main frame 20.
  • the second extension collar 40 has a similar form to that of the first extension collar 30 and extends upwards from the base course 8 to a position adjacent to the top 11 of the wear course 7.
  • the second extension collar 40 has a ridge 41 around its base 42 which cooperates with the ridge 33 on the upper surface 34 of the first extension collar 30.
  • a ridge 43 around the upper surface 44 of the second extension collar 40 is also provided.
  • Both the first 30 and second 40 extension collars are formed from concrete.
  • the main frame 20 and the two extension collars 30 and 40 surround a service frame 50, which is formed from cast iron and is an open rectangular frame having an upwardly extending wall portion 51 and outwardly and inwardly extending flange portions, 52 and 52a, respectively, at its base.
  • the service frame 50 has an inverted T-section.
  • the service frame 50 has a squarish horizontal cross-section (not shown) and the wall portion 51 thereof defines the access hole 15.
  • the service frame 50 has a plurality of strengthening members 53 which join the outside surface 54 of the wall portion 51 to the upper surface 55 of the flange portion 52.
  • Removably received in the service frame 50 is an access cover 60 which comprises a horizontally extending cover portion 61 and a downwardly extending wall portion 63.
  • the horizontal cross-section (not shown) of the cover portion 61 can take a variety of forms, such as circular or square, but is preferably tailored to suit the service frame 50.
  • the base of the downwardly extending wall portion 63 rests on the upper surface 57 of flange portion 52a, and hence the access cover 60 is supported on the service frame 50.
  • the purpose of the access cover 60 is to prevent objects falling into the access hole 15.
  • the cover portion 61 of the access cover 60 has a top surface 62 which is substantially flush with the top surface 11 of the wear course 7.
  • Support means 70 are positioned between the top surface 27 of the flange portion 22 of the main frame 20 and the bottom surface 58 of the flange portion 52 of the service frame 50.
  • the support means 70 is removable and comprises a base collar 71 and a height- adjustable spacer element 80.
  • the base collar 71 has a squarish horizontal cross-section (not shown) and a top surface 72.
  • the aperture in the base collar 71 coincides substantially with the access hole 15.
  • the base collar 71 is removably located in this position by means of sand grout 100.
  • Positioned on top of the base collar 71 is the height-adjustable spacer element 80.
  • This also comprises a collar 81 having a squarish horizontal cross-section (not shown) and an aperture coinciding substantially with that of the base collar 71.
  • a collar 81 having a squarish horizontal cross-section (not shown) and an aperture coinciding substantially with that of the base collar 71.
  • Around the upper surface 82 of collar 81 there are one or more tapered recesses, such as that shown at 85.
  • One or more wedges are inserted into these recesses, such as the wedge shown at 86, whereby the taper of the wedge 86 cooperates with the taper of the recess 85.
  • the tapered recess 85 and wedge 86 are shaped such that the top surface 87 of the wedge 86 remains substantially horizontal.
  • the service frame 50 When the service frame 50 is at the desired height, that is when the top surface 62 of the cover portion 61 of the access cover 60 is substantially flush with the top surface 11 of the wear course 7, the service frame 50 is se i-permanently fixed in place by inserting grout, cement or other packing material in the gap between the bottom surface 58 of flange portion 52 and the top surface 82 of collar 81. Once set, wedge 86 (and the other wedges not shown) can either be removed or left in place.
  • FIG. 2 a plan view of the collar 81 of the height-adjustable spacer element 80 is shown.
  • the collar 81 has four walls 83a-d which define a central squarish aperture 84.
  • the recesses 85a-d extend from the outer edges 86a-d to
  • Figure 3 is a vertical cross-section through line AA' showing the tapered recesses 85a and c in opposing walls 83a and c, respectively, and also the tapered recess 85d in wall 83d.
  • the height of the tapered recesses at 83a and c decreases from the outer edges 86a and c to the inner edges 87a and c, respectively.
  • Figure 4 shows a plan view of a base collar 90 for use in an alternative embodiment of the removable support means 70.
  • the base collar 90 in this embodiment of the present invention is similar to the collar illustrated in Figure 2, but with the tapered recesses removed, hence resulting in four equal and separate collar quarters 91a-d. When the collar quarters 91a-d are positioned as shown, they define a central squarish aperture 92 with regular gaps 93a-d between the collar quarters.
  • FIG 5 a vertical cross-section of a main frame 20 for use with the base collar 90 of Figure 4 is shown.
  • the dimensions and positions of the raised sections 29a-c are such that they cooperate with the gaps 93a-d between the collar quarters of the base collar 90 shown in Figure 4. Accordingly, the four collar quarters 91a-d are removably located on the top surface 27 of the flange portion 22 of the main frame 20.
  • Jacks such as of the hydraulic type or of the spring return ram variety, can now be positioned on the top surface of each of the three raised sections 29a-c (and also on the fourth raised section not shown) and flange portion 52 of the service frame 50 rested thereon.
  • the service frame 50 can then be raised or lowered to the desired level.
  • grout, cement or other suitable packing material is inserted in the space between the bottom surface 58 of flange portion 52 and the top surfaces of the four collar quarters 91a-d. Once the grout or cement has set, the jacks may be removed.
  • the jacks may be reinserted into their former positions and for the service frame 50 to be jacked up during which process the grout or the cement is fractured and can be removed. Once at the desired new level, fresh cement or grout is inserted.
  • pulling or lifting apparatus located above the service frame and releasably attached thereto may be used.
  • BSTITUTE SHEET (*ULE 26) down the access hole 15 and positioned on the top surface 27 of the flange portion 22 of the main frame 20.
  • the service frame 50 and access cover 60 are consequently conveniently located under the road surface without disturbing the road.
  • the road 5 is planed down up to and including the base course 8.
  • the first 30 and second 40 extension collars are either removed or broken-up.
  • the presence of the access cover 60 prevents objects and debris from falling down into the access hole 15.
  • the service frame 50 and access cover 60 are removed from the main frame 20 and the base collar 71 of the removable support means 70 is relocated on the top surface 27 of the flange 22 of the main frame 20.
  • the service frame 50 and access cover 60 are then placed back into the main frame 20, the bottom surface 58 of the flange portion 52 resting on the top surface 72 of the base collar 71.
  • the top surface 62 of the access cover 60 is now at substantially the height of the new base course to be laid.
  • a replacement first extension collar 30 up to this height is now added to the main frame 20.
  • the service frame 50 and access cover 60 are once more removed or raised from the main frame 20 and the height-adjustable spacer element 80 is relocated on the top surface 72 of the base collar 71.
  • the service frame 50 and access cover 60 are then placed back into the main frame 20, the bottom surface 58 of the flange portion 52 resting on the top surface 82 of collar 81 or on the top surface 87 of wedge 86 (and the top surfaces of the other wedges not shown) depending upon whether or not the wedges have been inserted in the recesses.
  • a second extension collar 40 is added to the first extension collar 30 to bring the main frame 20 to substantially the new level of the wear course to be laid.
  • the wear course is then laid and the height of the service frame 50 can be adjusted if necessary via the wedges, such as that shown at 86, so that the top surface 62 of the access cover 60 lies substantially flush with the newly laid wear surface. It will be appreciated that tilt of the road can be catered for by adjusting the wedges by differing amounts.
  • grout or cement or other packing material is inserted in the gap between the bottom surface 58 of the flange portion 52 of the service frame 50 and the upper surface 82 of the collar 81 of the height-adjustable spacer element 80.
  • this material has set, the wedges are either removed or left in place.
  • FIGS 4 and 5 the wearing surface is resurfaced in a similar manner to that described above.
  • the adjustment of the height of the service frame 50 is effected through the use of hydraulic jacks, rams, pulling or lifting apparatus as hereinbefore described and the height-adjustable spacer element 80 may accordingly be dispensed with.
  • Figures 6 and 7 show an alternative embodiment of a main frame 100 which may be stacked on top of another such frame. Accordingly, depending upon the depth of the access hole, one or more of the frames 100 may be used.
  • main frame 100 has an upwardly extending wall portion 101 and inwardly extending flange portion 102 at its base.
  • the main frame 100 has a squarish horizontal cross- section and the wall 101 and flange 102 portions define a central squarish aperture 103.
  • frame 100 is adapted to be stackable by virtue of a recess 104 formed around its outer lower edge, which, it will be appreciated, can cooperate with the upper part of a wall portion of another such frame.
  • flange portion 102 Four equally spaced recesses 105a-d are provided in flange portion 102 at positions approximately midway along the four sides and these facilitate lifting of the support means and service frame (not shown) by the use of one or more levers for example.
  • Figure 8 shows an alternative support means collar 110 for use with the stackable main frame 100 of Figures 6 and 7.
  • the collar 110 in this embodiment of the invention comprises four equal and separate collar quarters llla-d. When the collar quarters llla-d are positioned as shown, they define a central squarish aperture 112 which corresponds substantially with aperture 103 (see Figure 6) .
  • collar quarters llla-d are not diagonally symmetrical. Cut-out portions 113a-d are provided in collar quarters llla-d respectively to facilitate lifting of the service frame (not shown) by the use of one or more levers for example. Cut-out portions 113a-d are positioned away from the centre of the four sides of the collar and, accordingly, are out of alignment with respect to recesses 105a-d (see Figures 6 and 7) . In contrast to the support means illustrated in Figure l, no height-adjustable spacer element is provided. Consequently, in this embodiment of the invention, the service frame is moved from the first position to the second position simply by removal of collar 110. Fine adjustment of the height of the service frame may be achieved by the use of grout or cement or other packing material between the various mating surfaces. Screw holes H4a-d and screws (not shown) may also be provided to enable further height and/or tilt adjustment.
  • the device and method of the present invention address many of the problems associated with the prior art, for example the hazard of parts of the supporting frame standing proud of the surface.
  • the device of the present invention may be used in a variety of differently sized access holes. Inspection of the access hole is relatively simple and the device is easy to dismantle. Fine adjustment and tilt of the access cover is provided.

Landscapes

  • Engineering & Computer Science (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Mining & Mineral Resources (AREA)
  • Paleontology (AREA)
  • Environmental & Geological Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Road Repair (AREA)
  • Road Signs Or Road Markings (AREA)
  • Helmets And Other Head Coverings (AREA)
  • Dry Shavers And Clippers (AREA)
  • Rear-View Mirror Devices That Are Mounted On The Exterior Of The Vehicle (AREA)
  • Road Paving Structures (AREA)

Abstract

L'invention concerne un système pour installer une trappe d'accès (60) dans une surface d'usure, par exemple dans une route à couche de roulement (7) recouvrant une couche de fondation (8), le système comprenant un cadre mobile (50) portant la trappe amovible, et un cadre principal (20) pouvant être monté sous la couche de fondation. Le cadre mobile peut être placé dans plusieurs positions par rapport au cadre principal, notamment une première position dans laquelle le dessus (62) de la trappe d'accès est sensiblement à niveau avec la surface (11) de la couche d'usure et une seconde position dans laquelle la partie supérieure de la trappe d'accès est sensiblement à niveau avec le bas de la couche de fondation. Un procédé pour refaire le revêtement d'une route ou d'une surface du même type est également proposé.
PCT/GB1997/000887 1996-03-29 1997-03-27 Systeme pour le montage d'une trappe d'acces Ceased WO1997037086A1 (fr)

Priority Applications (6)

Application Number Priority Date Filing Date Title
AU22986/97A AU727064B2 (en) 1996-03-29 1997-03-27 Device for mounting an access cover
IL12638797A IL126387A (en) 1996-03-29 1997-03-27 Device for mounting an access cover
DE69708854T DE69708854T2 (de) 1996-03-29 1997-03-27 Einrichtung zur montage einer schachtabdeckung
NZ332095A NZ332095A (en) 1996-03-29 1997-03-27 Device for mounting an access cover
EP97915549A EP0890001B1 (fr) 1996-03-29 1997-03-27 Systeme pour le montage d'une trappe d'acces
AT97915549T ATE210228T1 (de) 1996-03-29 1997-03-27 Einrichtung zur montage einer schachtabdeckung

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB9606746A GB2311550A (en) 1996-03-29 1996-03-29 Device for mounting an access cover
GB9606746.7 1996-03-29

Publications (1)

Publication Number Publication Date
WO1997037086A1 true WO1997037086A1 (fr) 1997-10-09

Family

ID=10791340

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB1997/000887 Ceased WO1997037086A1 (fr) 1996-03-29 1997-03-27 Systeme pour le montage d'une trappe d'acces

Country Status (10)

Country Link
EP (1) EP0890001B1 (fr)
AT (1) ATE210228T1 (fr)
AU (1) AU727064B2 (fr)
CA (1) CA2250370A1 (fr)
DE (1) DE69708854T2 (fr)
GB (1) GB2311550A (fr)
IL (1) IL126387A (fr)
NZ (1) NZ332095A (fr)
WO (1) WO1997037086A1 (fr)
ZA (1) ZA972773B (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102015110887A1 (de) * 2015-05-18 2016-11-24 Gerhard Preisendörfer Vorrichtung und Verfahren zum Anheben einer Schachtabdeckung insbesondere Kanaldeckel

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH141824A (de) * 1929-11-25 1930-08-31 Huber Theophil Versenkbare Schachtabdeckung.
DE1484888B1 (de) * 1964-04-17 1969-09-18 Rudolph Alfred Hoehenverstellbare Schachtabdeckung
DE2445721A1 (de) * 1974-09-25 1976-04-08 Winfried Rathgeber Hoehenregulierbare abdeckung fuer strassenschaechte
GB2175334A (en) * 1985-03-26 1986-11-26 Peter Wright Height adjustable manhole cover
EP0311884A2 (fr) * 1987-10-12 1989-04-19 Von Roll Ag Couvercle de regard
DE4000965A1 (de) * 1990-01-16 1991-07-18 Passavant Werke Behaelter mit kontrollschacht
US5044818A (en) * 1990-07-24 1991-09-03 Pritchard Phillip C Adjustable manhole cover assembly

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE759178A (fr) * 1969-12-04 1971-04-30 Pont A Mousson Regard de chaussee
GB1441574A (en) * 1972-08-25 1976-07-07 Gibbons K Covers for roadway and like openings
SE372303B (fr) * 1974-03-19 1974-12-16 G Axgaerde
IN149552B (fr) * 1977-07-28 1982-01-23 Helms W R
GB2270708A (en) * 1992-08-22 1994-03-23 Warren Nigel Jones Height-adjustable road gully/inspection cover assembly

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH141824A (de) * 1929-11-25 1930-08-31 Huber Theophil Versenkbare Schachtabdeckung.
DE1484888B1 (de) * 1964-04-17 1969-09-18 Rudolph Alfred Hoehenverstellbare Schachtabdeckung
DE2445721A1 (de) * 1974-09-25 1976-04-08 Winfried Rathgeber Hoehenregulierbare abdeckung fuer strassenschaechte
GB2175334A (en) * 1985-03-26 1986-11-26 Peter Wright Height adjustable manhole cover
EP0311884A2 (fr) * 1987-10-12 1989-04-19 Von Roll Ag Couvercle de regard
DE4000965A1 (de) * 1990-01-16 1991-07-18 Passavant Werke Behaelter mit kontrollschacht
US5044818A (en) * 1990-07-24 1991-09-03 Pritchard Phillip C Adjustable manhole cover assembly

Also Published As

Publication number Publication date
ATE210228T1 (de) 2001-12-15
CA2250370A1 (fr) 1997-10-09
AU727064B2 (en) 2000-11-30
ZA972773B (en) 1999-01-22
GB2311550A (en) 1997-10-01
GB9606746D0 (en) 1996-06-05
EP0890001B1 (fr) 2001-12-05
DE69708854T2 (de) 2002-08-14
EP0890001A1 (fr) 1999-01-13
IL126387A (en) 2002-02-10
AU2298697A (en) 1997-10-22
IL126387A0 (en) 1999-05-09
DE69708854D1 (de) 2002-01-17
NZ332095A (en) 2000-04-28

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