EP1294992B1 - Manhole cover frame with self locking function of the cover - Google Patents

Manhole cover frame with self locking function of the cover Download PDF

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Publication number
EP1294992B1
EP1294992B1 EP01943188A EP01943188A EP1294992B1 EP 1294992 B1 EP1294992 B1 EP 1294992B1 EP 01943188 A EP01943188 A EP 01943188A EP 01943188 A EP01943188 A EP 01943188A EP 1294992 B1 EP1294992 B1 EP 1294992B1
Authority
EP
European Patent Office
Prior art keywords
locking
manhole cover
cover
cover frame
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.)
Expired - Lifetime
Application number
EP01943188A
Other languages
German (de)
French (fr)
Other versions
EP1294992A1 (en
Inventor
Ole Schack Hansen
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.)
DT GROUP AS
Original Assignee
BOETKERS TRAELAST AS
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
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Application filed by BOETKERS TRAELAST AS filed Critical BOETKERS TRAELAST AS
Publication of EP1294992A1 publication Critical patent/EP1294992A1/en
Application granted granted Critical
Publication of EP1294992B1 publication Critical patent/EP1294992B1/en
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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
    • E02D29/1427—Locking devices

Definitions

  • the present invention concerns a manhole cover frame with self-locking function of the cover of the kind indicated in the preamble of claim 1.
  • Manhole cover frames and well or manhole covers are made usually of cast iron, irrespective of the size. In most cases the dead weight of the cover will be so great that under normal conditions the cover cannot be opened by unauthorised persons. In practice, however, it has appeared to be a serious problem that even very large and heavy well or manhole covers can be sucked up at the passing of large vehicles. Therefore, in practice road authorities most often make requirements regarding a kind of locking function between cover and manhole cover frame. And of consideration to improved safety, most often self-locking manhole covers are used.
  • Self-locking manhole covers are known in many different embodiments, such as from DK-B-154 519, CH-A-448 917, SE-B-436 050, and GB-A-2 085 946. Common to these known covers are, however, that they are cumbersome to operate and often require special tools for releasing the spring-biased lock of the cover.
  • US-A-5 340 232 discloses a manhole cover with a frame and a grating or cover fitting flush with the frame.
  • a one-piece securing element is attached to the frame, the securing element having a locking element at the end of a tab-like retaining element extending obliquely upwards.
  • the locking element engages against a locking surface at the bottom of a recess in the surface of the grating or cover.
  • the locking element can be pulled away from the locking surface with a special tool, by way of example a pair of pliers, the retaining element being bent elastically.
  • the securing element is mounted on the frame, embracing shoulders so that it is secured by a snap-in connection. In other words the securing element is not an integrated part of the manhole frame and the retaining element is moveable in a vertical plane.
  • the invention has the purpose of indicating an improved manhole cover frame with self-locking function of cover of the kind mentioned in the introduction and which by means of simple measures makes the locking function more optimal and facilitates the operation.
  • the manhole cover frame according to the invention is characterised in that the said locking means are constituted by a number of approximately horizontal locking members being formed in a curved internal side wall of the manhole cover frame, said locking members having the same curvature as said internal side wall, and in that said locking members are provided at a free outer end with inwardly protruding locking projections, and further in that the frame at the outer side of said locking members and spaced apart therefrom has a curved outer wall section so that a curved cavity is formed behind the resilient locking members.
  • the dead weight of a cover according to the invention may be minimized, so that is easier to handle.
  • the dead weight of a cover according to the invention may be minimized, so that is easier to handle.
  • optimal function of the springy locking arm members as the curved cavities are only open downwardly, i.e. sand and gravel does not penetrate in behind and blocks the function of the locking arm members.
  • the manhole cover frame according to the invention may advantageously be thus designed that it is provided with two resilient locking members disposed mutually diametrically opposite.
  • the manhole cover frame according to the invention may advantageously be thus designed that it is provided with two resilient locking members disposed mutually diametrically opposite.
  • the manhole cover 2 shown in Fig. 1 is provided with two diametrical lateral recesses, the side profile of which comprising a lower locking surface 6 is more clearly seen in Fig. 4.
  • An embodiment for a manhole cover frame 8 shown in Fig. 2 and 3 comprises two horizontal curved, resilient locking arm members 12 in a side wall 10, the arm members 12 being connected with the side wall 10 at 14, and which at free outer ends 16 are provided with inwardly protruding locking projections 18 which, cf. Fig. 4, interact with the lower locking surface 6 of the lateral recesses 4 of the cover 2.
  • Fig. 4 is furthermore illustrated how the self-locking locking function between the manhole cover frame 8 and the cover 2 is easily released by means of an outer end of an operating lever 20 by pressing back the locking projections 18 so that the curved, resilient locking arm members 12 are pressed rearwards into a curved cavity 22 behind the locking arm members 12.
  • This cavity 22, which has outer walls 24 and 26 have just the purpose of providing that the function of the resilient locking arm members 12 is not disturbed by incoming material (stones and sand etc.), why the cavity 22 is only open downwards.

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  • Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Mining & Mineral Resources (AREA)
  • Paleontology (AREA)
  • Civil Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structural Engineering (AREA)
  • Underground Structures, Protecting, Testing And Restoring Foundations (AREA)
  • Bay Windows, Entrances, And Structural Adjustments Related Thereto (AREA)
  • Door And Window Frames Mounted To Openings (AREA)
  • Supports For Pipes And Cables (AREA)
  • Sewage (AREA)
  • Road Paving Structures (AREA)

Abstract

There is disclosed a manhole cover frame (8) with self-locking function of the cover (2), the manhole cover frame (8) comprising a number of locking means arranged to interact with complementarily shaped locking means of the cover, where the said locking means of the manhole cover frame are constituted by a number of curved, resilient locking members (12) which are formed in an internal side wall (10) of the manhole cover frame (8), and which at a free outer end (16) are designed with inwardly protruding locking projections (18), and that the complementarily shaped locking means of the cover are constituted by a corresponding number of upwardly open lateral recesses (14) having a lower locking face (6) which is arranged to interact with the said locking projections. By means of simple measures is hereby achieved an improved and more operation-friendly locking function which furthermore, due to the resilient locking members being situated in the side of the manhole cover frame instead of as previously normally in the cover, will be less exposed to being damaged in use. Furthermore, it will be regarded as an advantage that the dead weight of a cover according to the invention may be minimised, i.e. easier to handle.

Description

  • The present invention concerns a manhole cover frame with self-locking function of the cover of the kind indicated in the preamble of claim 1.
  • Manhole cover frames and well or manhole covers are made usually of cast iron, irrespective of the size. In most cases the dead weight of the cover will be so great that under normal conditions the cover cannot be opened by unauthorised persons. In practice, however, it has appeared to be a serious problem that even very large and heavy well or manhole covers can be sucked up at the passing of large vehicles. Therefore, in practice road authorities most often make requirements regarding a kind of locking function between cover and manhole cover frame. And of consideration to improved safety, most often self-locking manhole covers are used.
  • Self-locking manhole covers are known in many different embodiments, such as from DK-B-154 519, CH-A-448 917, SE-B-436 050, and GB-A-2 085 946. Common to these known covers are, however, that they are cumbersome to operate and often require special tools for releasing the spring-biased lock of the cover.
  • US-A-5 340 232 discloses a manhole cover with a frame and a grating or cover fitting flush with the frame. In order to secure the cover in such a way that it can be easily removed and put back in place, a one-piece securing element is attached to the frame, the securing element having a locking element at the end of a tab-like retaining element extending obliquely upwards. The locking element engages against a locking surface at the bottom of a recess in the surface of the grating or cover. To unluck the manhole cover, the locking element can be pulled away from the locking surface with a special tool, by way of example a pair of pliers, the retaining element being bent elastically. The securing element is mounted on the frame, embracing shoulders so that it is secured by a snap-in connection. In other words the securing element is not an integrated part of the manhole frame and the retaining element is moveable in a vertical plane.
  • The invention has the purpose of indicating an improved manhole cover frame with self-locking function of cover of the kind mentioned in the introduction and which by means of simple measures makes the locking function more optimal and facilitates the operation.
  • The manhole cover frame according to the invention is characterised in that the said locking means are constituted by a number of approximately horizontal locking members being formed in a curved internal side wall of the manhole cover frame, said locking members having the same curvature as said internal side wall, and in that said locking members are provided at a free outer end with inwardly protruding locking projections, and further in that the frame at the outer side of said locking members and spaced apart therefrom has a curved outer wall section so that a curved cavity is formed behind the resilient locking members. By means of simple measures is hereby achieved an improved and more operation-friendly locking function which furthermore, due to the springy locking arm members being provided in the side of the manhole cover frame instead of as previously normally in the cover, will be less exposed to being damaged by use. Furthermore, it will be regarded as an advantage that the dead weight of a cover according to the invention may be minimized, so that is easier to handle. In a simple way is hereby also ensured optimal function of the springy locking arm members as the curved cavities are only open downwardly, i.e. sand and gravel does not penetrate in behind and blocks the function of the locking arm members.
  • In order to achieve a more optimal distribution of the locking force, the manhole cover frame according to the invention may advantageously be thus designed that it is provided with two resilient locking members disposed mutually diametrically opposite. Hereby is also achieved a good symmetry of the locking function so that the cover does not capsize at the handling.
  • The invention is explained more closely in the following in connection with the drawing on which:
    • Fig. 1
    shows a plan view from above of an embodiment of a cover with self-locking function for a manhole cover frame or manhole according to the invention,
    Fig. 2
    shows a side sectional view of an embodiment of a manhole cover frame with self-locking function according to the invention,
    Fig. 3
    shows a top view, partly in section, of the manhole cover frame shown in Fig. 2 according to the invention, and
    Fig. 4
    shows an enlarged part sectional view for illustrating the locking function between manhole cover frame and manhole cover according to the invention.
  • The manhole cover 2 shown in Fig. 1 is provided with two diametrical lateral recesses, the side profile of which comprising a lower locking surface 6 is more clearly seen in Fig. 4. An embodiment for a manhole cover frame 8 shown in Fig. 2 and 3 comprises two horizontal curved, resilient locking arm members 12 in a side wall 10, the arm members 12 being connected with the side wall 10 at 14, and which at free outer ends 16 are provided with inwardly protruding locking projections 18 which, cf. Fig. 4, interact with the lower locking surface 6 of the lateral recesses 4 of the cover 2.
  • In Fig. 4 is furthermore illustrated how the self-locking locking function between the manhole cover frame 8 and the cover 2 is easily released by means of an outer end of an operating lever 20 by pressing back the locking projections 18 so that the curved, resilient locking arm members 12 are pressed rearwards into a curved cavity 22 behind the locking arm members 12. This cavity 22, which has outer walls 24 and 26 have just the purpose of providing that the function of the resilient locking arm members 12 is not disturbed by incoming material (stones and sand etc.), why the cavity 22 is only open downwards.

Claims (2)

  1. A manhole cover frame (8) with self-locking function of the cover (2), the manhole cover frame comprising a number of resilient locking means being adapted to interact with complementarily shaped locking means of the cover, characterised in that the said locking means are constituted by a number of approximately horizontal locking members (12) being formed in a curved internal side wall (10) of the manhole cover frame, said locking members having the same curvature as said internal side wall, and in that said locking members (12) are provided at a free outer end (16) with inwardly protruding locking projections (18), and further in that the frame at the outer side of said locking members and spaced apart therefrom has a curved outer wall section so that a curved cavity (22) is formed behind the resilient locking members (12).
  2. A manhole cover frame according to claim 1, characterised in that it is formed with two resilient locking members (12) disposed mutually diametrically opposite.
EP01943188A 2000-06-28 2001-06-21 Manhole cover frame with self locking function of the cover Expired - Lifetime EP1294992B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DK200001006A DK173561B1 (en) 2000-06-28 2000-06-28 Cesspit curb
DK200001006 2000-06-28
PCT/DK2001/000434 WO2002002877A1 (en) 2000-06-28 2001-06-21 Manhole cover frame with self locking function of the cover and cover therefor

Publications (2)

Publication Number Publication Date
EP1294992A1 EP1294992A1 (en) 2003-03-26
EP1294992B1 true EP1294992B1 (en) 2006-01-25

Family

ID=8159583

Family Applications (1)

Application Number Title Priority Date Filing Date
EP01943188A Expired - Lifetime EP1294992B1 (en) 2000-06-28 2001-06-21 Manhole cover frame with self locking function of the cover

Country Status (6)

Country Link
EP (1) EP1294992B1 (en)
AT (1) ATE316599T1 (en)
AU (1) AU6583301A (en)
DE (1) DE60116875T2 (en)
DK (2) DK173561B1 (en)
WO (1) WO2002002877A1 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DK173561B1 (en) * 2000-06-28 2001-03-12 Cesspit curb
AU783938B2 (en) * 2001-04-30 2006-01-05 Webforge Australia Pty Ltd Access cover assembly

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE7029833U (en) * 1970-08-07 1970-12-17 Passavant Werke LOCKABLE MANHOLE COVER.
DE3039790C2 (en) * 1980-10-22 1983-09-15 Adam 6101 Modautal Klenk Manhole cover designed in the manner of a bayonet lock
CH678639A5 (en) * 1989-07-11 1991-10-15 Von Roll Ag
JP3322590B2 (en) * 1997-02-18 2002-09-09 日之出水道機器株式会社 Underground structure lid locking structure
DK173561B1 (en) * 2000-06-28 2001-03-12 Cesspit curb

Also Published As

Publication number Publication date
DK1294992T3 (en) 2006-05-22
DE60116875D1 (en) 2006-04-13
DK173561B1 (en) 2001-03-12
WO2002002877A1 (en) 2002-01-10
ATE316599T1 (en) 2006-02-15
DK200001006A (en) 2001-03-12
EP1294992A1 (en) 2003-03-26
DE60116875T2 (en) 2006-11-02
AU6583301A (en) 2002-01-14

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