GB2190446A

GB2190446A - Pipe coupling

Info

Publication number: GB2190446A
Application number: GB08709560A
Authority: GB
Inventors: Eugene Szederjei
Original assignee: Georg Fischer AG
Current assignee: Georg Fischer AG
Priority date: 1986-05-16
Filing date: 1987-04-23
Publication date: 1987-11-18
Also published as: ES2003059A6; JPS62274187A; AT394430B; GB8709560D0; DE3712260A1; CH670144A5; DE3712260C2; IT8720399A0; ATA94387A; IT1204564B

Description

GB 2 190 446 A 1 SPECIFICATION Figures 1 to 3 showa fitting 1 constructed

as a reducing socket or coupling 2,which hastwo internal Pipecoupting threads3a and3bwith different diameters. The external contour of the straight screw coupling is This invention relatesto a pipe coupling made of a 70 formedwithtwo polygonal heads,there being a larger castormouided material and having an internal octagon 4a inthevicinityof the larger internal thread thread for connecting the couplingto a pipe endof a 3a and a small octagon 4b in thevicinityof thesmaller pipeline. internal thread 3b. The transition 5 betweenthetwo Itis knowntoform pipe couplingsas castingsor octagonal heads 4a, 4b is conical.

mouldings, preferably of malleable cast iron, and 75 Figures 4 and 5 show a fitting 1 constructed as a having a circular external shape (as seen in cross- T-piece 10 with three identical internal threads 3 and section at right angles to the axis of the coupling), and whose outer contour is constructed as an octagon 4 in also being provided with a reinforcing rim orflange at the vicinity of internal thread 3. Portion 11 of the outer one end which has an internal thread. contour located between the octagons is constructed Thefirm screwing together of the coupling to a pipe 80 circular in cross- section, the external diameterthereof end can only be carried out using a pipe wrench, and corresponding to the corner dimension of the octagon this is liable to cause damage to the usual external zinc 4.

coating provided on the coupling. Furthermore, re- Figures 6 and 7 show a fitting 1 constructed as an lease of an assembled coupling in a long-installed angle or corner20 with two identical internal threads pipeline system often cannot be achieved without 85 3, the outer contour also having an octagon 4 in the causing damage to the coupling. vicinity of internal thread 3. The arcuate part 21 is It is therefore an object of the invention to provide a cross-sectionally round, the external diameter corres pipe coupling of the type referred to above which can ponding to the corner dimension of the octagon.

be installed in a pipeline, or removed, more readily Figures 8 and 9 also show a corner 20, an internal than hitherto and with reduced risk of damage being 90 thread 3 being provided at one end and an external caused to the coupling. thread 6 atthe other. In the vicinity of the internal According to the invention there is provided a pipe thread, the outer contou r is provided with an octagon coupling made of a cast or moulded material and 4, the arcuate part 21 being cross-sectionally round, as having an internal th read for connecting the coupling in Figure 6.

to a pipe end of a pipeline, in which an external 95 Obviouslythe T-piece and corners can also have polygonal head isformed on the coupling in the different diameter internal andlor external threads neighbourhood of the internal thread for engagement and in each case, at least in the vicinity of the internal by a pipe wrench to connect or disconnectthe thread, the outer contour is constructed as a polygon, coupling with respect to a pipe end. preferably as an octagon.

Preferably, the formation of the polygonal head is 100 The polygonal head is arranged in such a waythat such thattwo facing corners thereof can be located two facing corners 7 come to rest in the mould parting along a mould parting plane of a split mould, to permit plane (of Figures 2,3 and 5). This permits a completely ready removal of the coupling from the mould satisfactory removal from the mould of the mouldings whereby, as a result of its simple shape, it can be - and the keyfaces can be constructed parallel to one produced rationally in a moulding or casting operaanother, so thatthere is no need for mechanical tion. working of the surfaces.

Embodiments of pipe coupling according to the Preferablythe fittings are madefrom malleable cast invention will now be described in detail, by way of iron and are subsequently galvanized.

Claims

example only, with reference to the accompanying CLAIMS drawings, in

which: 110 1. A pipe coupling made of a castor moulded Figure 1 is a longitudinal sectional view of a first material and having an internal thread for connecting embodiment of pipe coupling in theform of a straight the coupling to a pipe end of a pipeline, in which an fitting having a reducing socket; external polygonal head is formed on the coupling in Figure
2 is a section taken on the line 11-11 in Figure 1; the neighbourhood of the internal threadfor engage Figure
3 is a section taken along 111-111 in Figure 1; 115 ment by a pipe wrench to connect or disconnectthe Figure
4 is a sectional view of a second embodiment coupling with respectto a pipe end.

of pipe coupling in theform of a T-piece fitting; 2. A pipe coupling according to Claim 1, in which Figure
5 is aside view of the embodiment shown in the polygonal head is an octagonal head.

Figure4; 3. A pipe coupling according to Claim 1 or2, in Figure
6 is aside view, partly in section, of a third 120 which the coupling comprises a corner or bend fitting.

embodiment of pipe coupling in the form of a corner 4. A pipe coupling according to Claim 1 or2, in or bend having two internal threads; which the coupling comprises a T- piece.

Figure7 is a sideview of the embodimentshown in 5. A pipe coupling according to claim 1 or 2, in Figure 6; which the coupling comprises a straight socket having Figure 8 is a side view, partly in section, of a fourth 125 internal th reads of the same or different diameters.

embodiment of pipe coupling in the form of a corner, 6. A pipe coupling according to anyone of the bend or angle having an internal thread and an preceding claims, in which the formation of the external thread; and polygonal head is such thattwo facing corners thereof Figure 9 is aside view of the embodiment shown in can be located along a mould parting plane of a split Figure& 130 mould, to permit ready removal of the coupling from 2 GB 2 190 446 A 2 the mould.
7. A pipe coupling according to Claim land substantially as hereinbefore described with reference to, and as shown in any of the embodiments 5 illustrated in the accompanying drawings.
8. A method of casting a pipe coupling having an internal thread for connecting the coupling to a pipe end of a pipeline, and an external polygonal head formed on the coupling in the neighbourhood of the internal threadfor engagement by a pipe wrench to connect ordisconnectthe coupling with respecttothe pipe end, the method using asplitmould,and inwhich the mould is shaped so as to form two opposing corners of the polygonal head along the parting plane of the split mould, therebyto permit ready removal of the cast coupling from the mould.

Printed in the United Kingdom for Her Majesty's Stationery Office by the Tweeddale Press Group, 8991685, 11187 18996. Published at the Patent Office, 25 Southampton Buildings, London WC2A lAY, from which copies may be obtained.

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