GB1600494A - Access cover and method of making it - Google Patents
Access cover and method of making it Download PDFInfo
- Publication number
- GB1600494A GB1600494A GB2003580A GB2003580A GB1600494A GB 1600494 A GB1600494 A GB 1600494A GB 2003580 A GB2003580 A GB 2003580A GB 2003580 A GB2003580 A GB 2003580A GB 1600494 A GB1600494 A GB 1600494A
- Authority
- GB
- United Kingdom
- Prior art keywords
- cover
- plate
- aperture
- pressed
- stem portion
- 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
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D51/00—Making hollow objects
- B21D51/16—Making hollow objects characterised by the use of the objects
- B21D51/38—Making inlet or outlet arrangements of cans, tins, baths, bottles, or other vessels; Making can ends; Making closures
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P11/00—Connecting or disconnecting metal parts or objects by metal-working techniques not otherwise provided for
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Coating With Molten Metal (AREA)
Description
(54) ACCESS COVER AND METHOD OF MAKING IT
(71) I, FRANCIS SIDNEY CLARK, of 292 Broadway, Yaxley, Peterborough, a
British subject, do hereby declare the invention, for which I pray that a patent may be granted to me, and the method by by which it is to be performed, to be particularly described in and by the following statement:- This invention relates to access covers, by which is meant covers for items such as sewage manholes or inspection chambers, chambers for electrical gear, or chambers for water or gas cocks, which covers will normally but not essentially be roughly level with the surface of the ground. In particular, manhole covers have traditionally in the past been made from cast iron, but more recently techniques have been developed whereby such covers are formed by pressing from metal plate.
The present invention provides an access cover pressed from metal plate and including a recess having an inwardly directed rim, the recess having been formed from a vase-like element having an inner bowl portion and an outer stem portion which was inserted through an aperture in the cover and deformed so as to engage a continuous portion of the plate adjacent the aperture in such a manner that it is rigidly connected to the plate.
Preferably. the outer stem portion was pressed outwardly so as to trap a continuous portion of the plate adjacent the aperture between the stem and bowl portion of the element.
Preferably, the stem portion of the element sealingly engages the plate.
Preferably, the stem portion was pressed outwardly using a former.
If the cover has flanges around it and surface protuberances or depressions on its upper surface. preferably the aperture in the cover has been punched and the plate has been pressed to form the flanges around the cover and the surface protuberances or depressions on the upper surface of the cover in a single operation.
Advantageously, the cover is provided with a protective coating, for instance by hot dip galvanizing or by painting if the plate had already been galvanized.
The invention will now be more particularly described, by way of example, with reference to the accompanying drawing which is a sectional view illustrating part of an inspection cover in accordance with the invention.
The cover is of rectangular shape and is pressed from a metal plate 1 and includes two recesses 2 (only one of which is shown).
The cover has flanges (not shown) around the cover and surface protuberances in the form of small bulges (also not shown) pressed from the metal plate 1. The cover can also have for instance a frame (not shown) for framing the maker's name. The recess 2 has an upper inwardly directed rim 3 defining a neck. The recesses are formed by punching two apertures in the plate 1. A pair of mushroom-shaped vase-like elements 4 each having a bulb portion 5 and a stem portion 6 are formed such as by extrusion or deep drawing.
The stem portion of each element 4 is inserted in an associated aperture in the plate until a bulb portion 5 engages the underside of the plate. Using a suitable former the stem portion is then pressed outwardly until it sealingly engages the upper surface of the plate and traps a continuous portion of the plate adjacent to the aperture between the stem and bulb por.tion of the element. The cover can be lifted by inserting a crank-shaped member into the neck of each recess 2. The apertures in the plate may be punched and the plate pressed to form the flanges around the cover and the surface protuberances (or depressions) on the upper surface of the cover in a single operation.
Plate 1 may be for instance about 3 mm thick and the preferred material for the plate 1 is mild steel.
The cover may be provided with a protective coating, for instance by hot dip galvanizing or by painting if the plate has already been galvanized.
Claims (7)
1. An access cover pressed from metal plate and including a recess having an inwardly directed rim, the recess having been formed from a vase-like element having an inner bowl portion and an outer stem portion which was inserted through an aperture in the cover and deformed so as to engage a continuous portion of the plate adjacent the aperture in such a manner that it is rigidly connected to the plate.
2. The cover of claim 1, wherein the outer stem portion was pressed outwardly so as to trap a continuous portion of the plate adjacent the aperture between the stem and bowl portion of the element.
3. The cover of claim 1 or 2, wherein the stem portion of the element sealingly engages the plate.
4. The cover of any one of the preceding claims, wherein the stem portion was pressed outwardly using a former.
5. The cover of any one of the preceding claims, wherein the aperture in the cover has been punched and the plate has been pressed to form flanges around the cover and surface protuberances or depressions on the upper surface of the cover in a single operation.
6. The cover of any one of the preceding claims, wherein the cover is provided with a protective coating.
7. An access cover, substantially as hereinbefore described with reference to, and as shown in, the accompanying drawings.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB2003580A GB1600494A (en) | 1978-05-31 | 1978-05-31 | Access cover and method of making it |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB2003580A GB1600494A (en) | 1978-05-31 | 1978-05-31 | Access cover and method of making it |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1600494A true GB1600494A (en) | 1981-10-14 |
Family
ID=10139293
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB2003580A Expired GB1600494A (en) | 1978-05-31 | 1978-05-31 | Access cover and method of making it |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB1600494A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2150619A (en) * | 1983-11-17 | 1985-07-03 | Clarksteel Ltd | An access cover |
-
1978
- 1978-05-31 GB GB2003580A patent/GB1600494A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2150619A (en) * | 1983-11-17 | 1985-07-03 | Clarksteel Ltd | An access cover |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed | ||
| PCNP | Patent ceased through non-payment of renewal fee |