IE20030662U1 - Push-fit pipe coupling - Google Patents
Push-fit pipe coupling Download PDFInfo
- Publication number
- IE20030662U1 IE20030662U1 IE2003/0662A IE20030662A IE20030662U1 IE 20030662 U1 IE20030662 U1 IE 20030662U1 IE 2003/0662 A IE2003/0662 A IE 2003/0662A IE 20030662 A IE20030662 A IE 20030662A IE 20030662 U1 IE20030662 U1 IE 20030662U1
- Authority
- IE
- Ireland
- Prior art keywords
- pipe
- release member
- teeth
- coupling device
- tool
- Prior art date
Links
- 230000001808 coupling Effects 0.000 title claims abstract description 25
- 238000010168 coupling process Methods 0.000 title claims abstract description 25
- 238000005859 coupling reaction Methods 0.000 title claims abstract description 25
- 230000000994 depressed Effects 0.000 claims abstract description 5
- 238000007789 sealing Methods 0.000 claims abstract description 4
- 230000000881 depressing Effects 0.000 abstract description 2
- 229910001369 Brass Inorganic materials 0.000 description 4
- 239000010951 brass Substances 0.000 description 4
- 229910001220 stainless steel Inorganic materials 0.000 description 3
- 239000010935 stainless steel Substances 0.000 description 3
- 210000000088 Lip Anatomy 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 230000000717 retained Effects 0.000 description 1
Abstract
ABSTRACT A pipe coupling device is provided in the form of a body having a passage having at least one open end to receive a pipe, a sealing member disposed in the passage to sealingly engage the pipe and an annular ring also disposed therein. The annular ring has inwardly directed teeth to Contact and grip the pipe when the pipe moves past said teeth. The device also includes a release member movable along the passage from a first position in which the teeth are free to grip the pipe to a second position in which the teeth are moved by the release member away from the pipe to thereby enable the pipe to be removed from the device, wherein the release member does not extend past the open end of the passage. This prevents the release member from being accidentally depressed when the coupling is moved past a projection. A tool is also provided to quickly and easily release a pipe by depressing the release ring.
Description
Technical Field
This invention relates to pipe coupling devices of the
push—fit type.
Background Art
Typically, such devices enable two or more pipes to be
coupled in sealing engagement simply by pushing the
pipes into receiving bores in the device. A gripping
member such as a ring having angled teeth allows the
pipe to enter the coupling device with little
resistance, but prevents the pipe from being puled out
of the device. A release member is typically provided
to disengage the gripping member from the device and to
enable the pipe to be withdrawn.
The release member is often a depressible annular
member through which the pipe enters the device and
which has a flange allowing a person to depress the
release member into the body of the device and thereby
to withdraw the tube. A problem with such devices is
that when a length of coupled piping is being moved it
is often dragged along a floor or pulled through a
tight space. In such cases the flange can catch on
projections past which it is being pulled causing the
release member to be depressed and the pipe to be
released. If the pipe contains a pressurised fluid
this can cause expensive damage to the surrounding
area.
Disclosure of the Invention
The invention provides a pipe coupling device
comprising a body having a passage defining a
longitudinal axis with at least one open end to receive
a pipe to be coupled thereto, the passage having a
sealing member disposed therein to sealingly engage
said pipe and an annular ring also disposed therein,
the annular ring having inwardly directed teeth angled
in the direction away from said open end to contact and
grip said pipe when the pipe moves past said teeth, and
further comprising a release member movable along said
axis from a first position in which the teeth are free
to grip said pipe to a second position in which the
teeth are moved by the release member away from said
pipe to thereby enable the pipe to be removed from the
device, wherein said release member does not extend
past the open end of the passage.
Preferably, the release member is in the form of a
generally annular cylindrical member having a first end
flush with said open end of said passage.
Further, preferably, the release member has a second
end with a tapered external surface to assist in
engaging said angled teeth.
The invention also provides a tool for releasing a pipe
from a pipe coupling device, the tool comprising a
part—cylindrical body member having a generally C-
shaped cross—section to allow a pipe to be introduced
laterally therein the body member including an outer C-
IE 050662
shaped cylindrical portion which is adapted to fit over
and receive said pipe coupling device internally and an
inner C-shaped cylindrical portion terminating at an
end surface which is adapted to engage and depress a
release member of said pipe coupling device when the
device is received in said outer C-shaped cylindrical
portion and the tool is pushed against the pipe
coupling device.
Preferably, the tool further comprises one or more
surfaces extending transversely from the body member to
assist a user in depressing the tool against a pipe
coupling device.
the inner portion is shorter than
Further, preferably,
the outer portion, whereby the pipe coupling device is
received securely in the outer portion of the tool
before the end surface of the inner portion meets the
release member.
Preferably, the inner and outer portions are connected
by a stop surface and the distance between the stop
surface and the end surface of the inner portion is
adapted to enable the release member of a pipe coupling
device to be depressed sufficiently to release a pipe
therefrom.
Brief Description of Drawings
The invention will now be further illustrated by the
following description of embodiments thereof, given by
|Efl30662
way of example only with reference to the accompanying
drawings, in which:
Fig. 1 shows a brass body for a pipe coupling
device after manufacturing;
Fig. 2 shows the body of Fig. 1 when it has been
processed to retain components therein;
Fig. 3A is an exploded elevation of the components
at one end of a pipe coupling device;
Fig. 3B is a part—sectional side view of the
assembled components at one end of a pipe coupling
device.
Fig. 4 is a sectional side view of an outer sleeve
shown in Figs. 3A and 3B;
Fig. 5 is a sectional side View of a release ring
shown in Figs. 3A and 3B;
Fig. 6 is a sectional side view of an inner sleeve
shown in Figs. 3A and 3B;
Fig. 7 is a combined side elevation and end plan
view of a grab ring shown in Figs. 3A and 3B;
Fig. 8 is an end plan view of an O—ring shown in
Figs. 3A and 3B;
Fig. 9 is a side elevation of a tool for use with a
pipe coupling device;
Fig. 10 is a bottom plan View of the tool of Fig.
lE05oss2
Fig. 11 is a cross—sectional elevation of the tool
of Fig. 9, taken at right angles to the view shown in
Fig. 9; and
Fig. 12 is a cross—sectiona1 elevation of the tool
of Fig. 9, taken from the same angle as the view shown
in Fig. 9.
Detailed Description of Preferred Embodiment
A brass body 10 for a pipe coupling device of the push-
fit type is shown in Fig. 1, in its initial state after
manufacturing. The interior of the body 10 includes an
inner wall section 12 whose internal diameter is
fractionally larger than the pipe sections (not shown)
to be coupled by the device, so that two pipe end
sections can be introduced into the device, each from a
respective end 16,18 of the device, without substantial
frictional resistance. The pipe end sections fit
within the inner wall section 12 to each abut against a
stop ring 14 provided on the inner wall section 12.
The internal diameter of the device is stepped outward
at two points moving from the stop ring 14 to the
respective ends 16, 18, so that adjacent to each half
of the inner wall section 12 is a middle wall section
of greater diameter than the inner wall section 12;
and adjacent each middle wall section 20 is an outer
wall section 22 of again greater diameter.
The middle wall section and outer wall section are
adapted to retain the components (to be described
below) which lock the pipe ends in place once inserted.
itué066Z
As shown in Fig. 2, in order to hold the components
(not shown) within the body lO, the lip 24 of the body
at each end is bent inwards to point towards the centre
line 26 of the body lO.
The assembly of components which are held in the body
are shown in exploded View in Fig. 3A and assembled
together in Fig. 3B. These components are also shown
individually in Figs. 4-8 and include: an outer sleeve
(Fig. 4), release ring 30 (Fig. 5), inner sleeve 32
(Fig. 6), stainless steel grab ring 34 (Fig. 7), and
rubber O-ring 36 (Fig. 8).
The rubber O—ring 36 (see Fig. 3B) forms a seal by
compression against the outer surface of a pipe end
(not shown) inserted into the body 10 to abut against
the stop ring 14. The inner sleeve 32 made of plastic
confines the rubber O—ring in place within the middle
wall section 20 where it is afforded a small degree of
axial movement to prevent pinching of the O—ring as the
pipe is inserted and removed (i.e. the O—ring rolls
slightly in the axial direction as the pipe end moves
past it). The O—ring and inner sleeve would permit a
pipe end to be freely inserted and removed with a small
degree of frictional resistance were the grab ring not
present.
The grab ring 34 comprises a stainless steel ring 38
(see Fig. 7) having a plurality of inwardly directed
resilient teeth 40 arranged on the inner circumference.
The teeth are angled towards the stop ring 14 when the
IEDSOSGZ
grab ring is assembled in the device, such that they
permit a pipe surface to slide into the device but bite
into the surface of the pipe when a force is exerted to
remove the pipe from the device. Indeed as the force
exerted to remove the pipe increases, the retaining
force exerted by the teeth against the surface of the
pipe also increases, and only a sufficient force to
cause breakage or failure of the teeth would allow the
pipe to be removed.
The grab ring is locked in position between the inner
and outer sleeves 32,28 which trap the stainless steel
ring 40 between them. The outer sleeve is itself held
in position by the inwardly directed lip 24 of the
brass body which is bent inward after the components
are assembled.
The release ring 30 is retained inside the outer sleeve
.by a flange 42 which has a greater diameter than a
stepped surface 44 (see Figs. 4 and 5) of the outer
sleeve. A frusto—conical surface 46 on the release
ring 30 is adapted to displace the teeth 40 of the grab
ring 34 when the release ring 30 is depressed into the
brass body. To remove a pipe which is locked into the
body by the grab ring, therefore, a tool 48 (Fig. 9) is
provided to depress the release ring 30.
The tool 48 has a curved surface 50 which is matched to
the outer diameter of the pipe and terminates at an
acting end 52 which is placed in abutting relationship
(Fig. 3B)
against the visible end surface 54 of the
lEU30651
release ring 30. A flange 54 is provided to enable a
user to press the tool 48 along the pipe surface and a
short distance into the body l0 causing the release
ring to move inwardly into the body forcing the teeth
40 away from the pipe surface. This allows the pipe to
be pulled out of the body.
F. R. Kelly & Co.
Agents for the Applicants
Claims (5)
1. A pipe coupling device comprising a body having a passage defining a longitudinal axis with at least one open end to receive a pipe to be coupled thereto, the passage having a sealing member disposed therein to sealingly engage said pipe and an annular ring also disposed therein, the annular ring having inwardly directed teeth to Contact and grip a pipe when the pipe moves past said teeth, and further comprising a release member movable along said axis from a first position in which the teeth are free to grip said pipe to a second position in which the teeth are moved by the release member away from said pipe to thereby enable the pipe to be removed from the device, wherein said release member does not extend past the open end of the passage.
2. A device as claimed in claim 1, wherein the release member is in the form of a generally annular cylindrical member having a first end flush with said open end of said passage, and optionally, the release member has a second end with a tapered external surface to assist in engaging said angled teeth.
3. A tool for releasing a pipe from a pipe coupling device, the tool comprising a part—cylindrical body member having a generally C—shaped cross-section to allow a pipe to be introduced laterally therein the body member including an outer C-shaped cylindrical portion which is adapted to fit over and receive said |Efi506 pipe coupling device internally and an inner C—shaped cylindrical portion terminating at an end surface which is adapted to engage and depress a release member of said pipe coupling device when the device is received in said outer C—shaped cylindrical portion and the tool is pushed against the pipe coupling device.
4. A tool as claimed in claim 3, wherein the inner portion is shorter than the outer portion, whereby the pipe coupling device is received securely in the outer portion of the tool before the end surface of the inner portion meets the release member.
5. A tool as claimed in claim 3 or 4, wherein the inner and outer portions are connected by a stop surface and the distance between the stop surface and the end surface of the inner portion is adapted to enable the release member of a pipe coupling device to be depressed sufficiently to release a pipe therefrom.
Publications (2)
Publication Number | Publication Date |
---|---|
IES83409Y1 IES83409Y1 (en) | 2004-04-21 |
IE20030662U1 true IE20030662U1 (en) | 2004-04-21 |
Family
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