AU6163473A - Coupling and pipe ends - Google Patents

Description

4P, INS~TRUJCiONS I( Convention. application'insert "Convenition'

COMMONWEALTH OF AUSTRALIA

61,634 /7 Patents Act APPLICATION FOR A

Insert FULL X/Wemb KNOX SCE[JAPP PTY.IJTD. namne(s) of applicant(s)

Insert FULL address(es) of of~c) Grahamn Street, Port Melbourne, Victoria, Australia applicant(s)

hereby apply for the grant of a Patent for an invention entitled Insert TITLE (d) of invention "COUPLING AN~D PIPE ENDS"

Insert "conmplete' OR "provisional' which is described in the accompanying (e) pr-ovisional specification.

-Tw&-appk" fof--H-P* W* lQuawaL RECEIVED Insert number, country and filing date for Oak!) az the/or EACH basic applicat~on Receipt-..

.l Application tk 9,

-/ato

Address for Service: PHILLIPS, ORMONDE AND FITZPATRICR--- Patent and Trade Mark Attorneys 37-41 Queen Street, Melbourne, Australia

Insert DATE of s igning Dated (g)l9th October, 1972

(Is) Signature of applicar PHILLIPS ORMONDE FITZPATRICK (For body corporate see lieadnole*)

CorporatI seal if any

Noi,-: No legalization r other witness required

*Patents Act

DECLARATION F~OR A, PATENT APP~iC-AT1ON V ISTRUCTIONS Insert "Convenition" if applicable in support of the application made by Insert FULL nam,(s) of applicant(s) ()IUTOX SC1[IAPP PTY. ETD. 61,634 n73 Insert "of addition" if applicable (hereinafter called "applicant(s)") for a patent Wc for an Insert TITLE of invention entitled (d) invention "COUPLING AND PIPE ENDS"

Insert FULL name(s) AND address(es) of General 12(e) Roderick Scott M~acdermid, Director declarant(s) (See headnote*) Manager of Knox Schlapp Pty. L~td. of Graham Street, Port Melbourne, Victoria, Autralia

do solemnly and sincerely declare as follows:

1. I am/Wt- eeauthorized to make this declaration on behalf of the applicant(s).

Wf Insert FULL name(s) AND address(es) Of actual inventor(s) James L~ivingstone Taylor of Graham S3treet, Port Melbourne, Victoria

Recite how appli- is/,e- the actual inventore-) of the invention and the facts upon which the applicant(s) cant(s) derhelsi title from actual is hae entitled to make the application are as follows: inventor(s) (See headnote**) (g)

Applicant is the assignee of' the said invention from the actual inventor

(hi Insert country. R7 -J filing date, and basic applicanttsi for the/'or EACHI basic application

Insert PLACE of signng Insert DATE of Declared at (k) i~ signing Dated 1-0U&c,1.2- (nmlSignature(s) of de clarant(s)

Note: No legalization or other witness required

To: The Commissioner of Patents

COMMONWEA-LTH OF AUSTRALIA

Patents A ct

611634 /73 COMPLETE SPECIFICATION (ORIGINAL)

Class Int. Class Application Number: (a 6' 1 73 /4 21 O02 Lodged: ,Q c)

Complete Specification Lodged: 9' -C-73 tl*7c Published: Priority:

Related Art:

APPLICANT'S REF.: PB 0912/72 Name(s) of Applicant(s): FJJO SCIAPP P~TY. LTD.

Add,7ess(Ls) of Applicant(s): Graham Street, Port !k.elbourne, Victoria, Australia

Actual Jrventor(s): James Liivingstone Taylor

Address fo: Service is., PHILLIPS, ORMONDE FITZPATRICK Patent anzd Trade Mark Attorneys 37-4 1 Queen Street Melbourne, Australia, 3000 Complete I-pecificatio-, for the invention entitled:

The following statenwunt is a full description of this invention, in'chidfng the t'e't method of performing

I The present invention relates to a new and

improved coupling suitable for joining of members such

as pipes for example plastic pipes.

Plastic pipes such as polyvinylchloride pipes

have recently gained acceptance and are in wide use in

Australia. In many uses for the pipes it is necessary

to allow for relative mbvement, such as relative expansion,

between the pipes and indeed this is required by the

appropriate authorities in the case of soil, waste and vent pipes for example. Difficulties are experienced

however in providing an adequate seal between lengths of

pipes in these circumstEnces. In time dust and grime

collects on the pipes and as movement occurs this is worked

into the joint causing substantial damage of the seal.

The object of the present invention is to provide a coupling and pipe ends suitable therefor that provides a

suitable dust seal to the joint between the pipe ends.

Whilst the present description is given in

relation to a coupling suitable for joining pipes the

invention is not to be taken as limited thereto. The principles of the present invention are applicable to

other members and where reference is made to the pipes in the description that follows the term should be construed

as to include other suitable members.

The present invention provides a pipe end coupling

including:

a female pipe end;

a male pipe end having an entry portion of reduced

diameter with respect to the diameter of the female pipe

end whereby to enable the entry portion to fit within

S: or other witness at h E required the female pipe end; an ring seal between the female pipe end and the male pipe end, said seal being provided within an annular recess in the inner wall of the female pipe end or the outer wall of said entry portion of the male pipe end, whereby to provide a seal between said pipe ends whilst allowing for relative movement therebetween; an annular skirt around the outer wall of the male pipe end and extending in part over the entry portion thereof whereby to provide a sealing gap into which the edge of the female pipe end extends thereby to cover the female pipe end against ingress of foreign material.

The following description refers in more detail

to these essential features and further optional features

of the invention. To facilitate understanding of the invention, reference is made to the accompanying drawings

where these features are illustrated in preferred form.

It is to be understood however, that the essential and optional features of the invention are not limited to the

specific forms of these features as shown in the drawings.

In the drawings:

Figure 1 shows a female and male pipe end

separated to show the preferred construction;

Figure 2 shows the pipe ends of figure 1 in

section and coupled together.

'he coupling -f the presenu invention includes a pair of opposed pipe ends one which will be called a female pipe end 6 and the other which will be called a other witness required

To: The Commissioner of Patents

male pipe end 7. Preferably each of the pipe ends is

substantially cylindrical in formation as shown.

Either the female or male pipe end includes an

annular recess for the ring seal 9. Preferably the

recess 8 is provided in the inner wall of the female pipe

end 6 for this purpose. Any suitable resilien 4 circ. ar

member may be provided for the ring seal 9. For

example a rubber 0-ring seal may be employed. The seal

recess 8 is preferably spaced inwardly from the edge 11 of the female pipe 6. Spaced further inwardly may be a

stop. The stop may be .i the form of an annular shoulder

12 extending around within the inner wall of the female

pipe end and this will be referred to as the inner stop.

The female pipe end may be provided on its

outer surface with an outer shoulder, which is preferably

an annular shoulder 13 located over the seal recess 8 and

in the preferred form is provided by a bend in the female

pipe wall that provides the seal recess 8 on its inner face

and the outer shoulder 13 on its outer face. It is preferred that the outer shoulder 13 be spaced from the edge 11 of the

female pipe end to provide an expansion portion 14 between

the outer shoulder 13 and the edge 11 of the pipe end. A gripping flange 16 may be provided on the outer surface of

the female pipe 6 and spaced further inwardly of the outer

shoulder 13. The gripping flange 16 may also be an annular

flange,

The coupling includes a male pipe end 7 and the

invention also relates to the male pipe end as an ar t icle az such. The male pipe end 7 includes a pipe body having

an entry portion 17 of reduced diameter at one end thereof.

,J

The entry portion 17 is adapted to fit within the female pipe end 6 preferably to a depth at or near the inner annular shoulder 12. Preferably the entry portion 17 abuts with the 0-ring seal 9 to provide a tight fit between the male pipe end and the female pipe end. It will be appreciated that the 0-ring seal recess 8 may be located in the entry portion 17 of the male pipe end 17 rather than in the female pipe end 6 as previously described. But as a matter of convenience it is preferred that the 0-ring s'-al recess be provided in the female pipe end. The male pipe end includes an annular skirt 18 that bends in part over the entry portion 17 and is spaced therefrom by a distance sufficient to provide a sealing gap 19 into which the expansion portion 14 of the female pipe end may extend. Preferably the skirt 18 is joined to the male pipe end at the junction of the entry portGion 17 and the pipe body whereby the pipe body provides in con- junction with the entry portion 17 and the skirt 18 an end wall for the sealing gap 19. Preferably the skirt 18 is of about the same dimension longitudinally of the pipe ends as is the expansion portion 14 of the female pipe end and each is preferably in excess of ill for example in the case of a 41t pipe fitting so that the expansion portion will still

be retained within the sealing gap when an expansion of -is provided for. The coupling and pipe ends may be made of any suitable material. Polyvinylchloride and polypropylene or propylene-ethylene copolymers as well as acrylonitrile- r i

I butadiene-styrene terpolymers are particularly satis-

factory.

The preferred pipe ends will now be further

described with reference to their interrelationship in

use. Details of this should not however be taken as

restricting upon the present invention, Generally the

female pipe end will be fixed and held firm by the

gripping flange 16. To assemble the coupling the entry

portion 17 of the male pipe end 7 is placed within the

female pipe end 6 to engage the O-ring seal 9 and to a

depth sufficient for the skirt 18 to extend over the

expansion portion 14 but leaving an expansion space

between the outermost elge 21 of the skirt 18 and the

outer shoulder 13 on the female pipe end. This provides

for relative movement between the parts proferpbly the

male pipe end 7 being free to move and the female pipe end

6 being fixed. Any dust or grime that falls on the coupling

will rest either on the outer surface of the skirt 18 or

on the outer surface of the expansion portion 14. On

movement some of the dust or grime may enter the sealing

gap 19 being carried by the expansion portion 14. However

the dust or grime will not easily pass around the edge 11

of the female pipe 6 to reach the entry portion 17 of the

male pipe end 7 and the O-ring seal 9 which therefore is

protected satisfactorily.

It will be seen then that the present invention

provides a new and iriproved male pipe end capable of

providing a substantially dust free seal in conjunction

with another pipe end in a coupling and also provides a

superior substantially dust free coupling arrangement.

It will be appreciated of course that various minor

modifications, alterations and additions may be made

to the above described apparatus and arrangement of

parts without departing from the ambit of the present

invention as defined in the claims annexed hereto.

Claims (1)

1. The claims defining the invention are as follows:

   1. A pipe end coupling including,

   a female pipe end;

   a male pipe end having an entry portion of reduced

   diameter with respect to the diameter of the female

   pipe end whereby to enable the entry portion to fit

   within the female pipe end;

   an ring seal between the female pipe end

   and the male pipe end, said seal being provided

   within an annular recess in the inner wall of the

   female pipe end or the outer wall of said entry

   portion of the male pipe end, whereby to provide

   a seal between said pipe ends whilst allowing for

   relative movement therebetween;

   an annular skirt around the outer wall of the

   male pipe end and oxtending in part over the entry

   portion thereof whereby to provide a sealing gap

   into which the edge of the female pipe end extends

   thereby to cover the female pipe end against ingress

   of foreign material.

   2. A pipe end coupling as claimed in claim 1, wherein

   the said ring seal is provided within an annular recess

   in the inner wall of the female pipe end.

   3. A pipe end coupling as claimed in claim'l or

   claim 2, wherein an annular shoulder is provided on the

   outer wall of the female pipe end spaced from the edge

   thereof whereby to provide a stop by abutment with the edge of the annular skirt,

   4. A pipe end coupling as claimed in claim 3, as

   appended to claim 2, wherein said annular recess on the inner wall is within the annular shoulder on the outer wall.

   L pipe end coupling as claimed in any preceding claim, wherein an annular gripping flange is provided on

   the outer wall of the female pipe end.

   6. A pipe end coupling as cla'imed in any preclding

   claim, wherein an annular stop shoulder is provided on

   the inner wall of the female pipe en. whereby to provide

   a stop by abutment of the edge of the entry portion of the

   male pipe end.

   7. A pipe end coupling substantially as hereinbefore described with reference to the accompanying drawings.

   8. A male pipe end for use with a pipe end coupling

   as claimed in any preceding claim, including an entry

   portion of reduced diameter with respect to the remainder

   of the pipe end, whereby to enable the entry portion to

   fit within a female pipe end and an annular skirt around

   the outer wall and extending in part over the entry portion thee f whereby to provide a sealing gap into which the edge

   of the female pipe end may extend to cover the female pipe

   end against ingress of foreign material.

   DATED: 15th October, 1973

   PHILLIPS ORMONDE FITZPATRIOK L Attorneys for ETOX SOHLAPP PTY. LTD.

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