NZ721246B2 - Pipe connection fitting - Google Patents
Pipe connection fitting Download PDFInfo
- Publication number
- NZ721246B2 NZ721246B2 NZ721246A NZ72124614A NZ721246B2 NZ 721246 B2 NZ721246 B2 NZ 721246B2 NZ 721246 A NZ721246 A NZ 721246A NZ 72124614 A NZ72124614 A NZ 72124614A NZ 721246 B2 NZ721246 B2 NZ 721246B2
- Authority
- NZ
- New Zealand
- Prior art keywords
- collet
- ring
- pipe
- tubular body
- tube
- Prior art date
Links
- 241000013987 Colletes Species 0.000 claims abstract description 232
- 238000003780 insertion Methods 0.000 claims abstract description 18
- 239000000463 material Substances 0.000 claims description 15
- 238000007789 sealing Methods 0.000 claims description 7
- 229910000639 Spring steel Inorganic materials 0.000 claims description 4
- 239000004033 plastic Substances 0.000 claims description 4
- 229920003023 plastic Polymers 0.000 claims description 4
- 238000004519 manufacturing process Methods 0.000 abstract description 4
- 229920003020 cross-linked polyethylene Polymers 0.000 description 6
- 150000002500 ions Chemical class 0.000 description 5
- 238000000034 method Methods 0.000 description 5
- 238000007906 compression Methods 0.000 description 4
- 239000004703 cross-linked polyethylene Substances 0.000 description 4
- -1 polyethylene Polymers 0.000 description 4
- 239000000203 mixture Substances 0.000 description 3
- 238000009428 plumbing Methods 0.000 description 3
- 239000010935 stainless steel Substances 0.000 description 3
- 229910001220 stainless steel Inorganic materials 0.000 description 3
- 229920001169 thermoplastic Polymers 0.000 description 3
- 239000004416 thermosoftening plastic Substances 0.000 description 3
- 229910001369 Brass Inorganic materials 0.000 description 2
- 239000004698 Polyethylene (PE) Substances 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 2
- 239000010951 brass Substances 0.000 description 2
- 238000011109 contamination Methods 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 230000001808 coupling Effects 0.000 description 2
- 238000005304 joining Methods 0.000 description 2
- 229910001092 metal group alloy Inorganic materials 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- 229920000573 polyethylene Polymers 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 239000005977 Ethylene Substances 0.000 description 1
- 229920001748 Polybutylene Polymers 0.000 description 1
- 229920002725 Thermoplastic elastomer Polymers 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 230000000875 corresponding Effects 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 150000001993 dienes Chemical class 0.000 description 1
- 229920001971 elastomer Polymers 0.000 description 1
- VGGSQFUCUMXWEO-UHFFFAOYSA-N ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000006011 modification reaction Methods 0.000 description 1
- 239000000178 monomer Substances 0.000 description 1
- 229920000098 polyolefin Polymers 0.000 description 1
- 229920001296 polysiloxane Polymers 0.000 description 1
- 229920002635 polyurethane Polymers 0.000 description 1
- 239000004814 polyurethane Substances 0.000 description 1
- 229920000915 polyvinyl chloride Polymers 0.000 description 1
- 239000004800 polyvinyl chloride Substances 0.000 description 1
- 230000000284 resting Effects 0.000 description 1
- 230000000717 retained Effects 0.000 description 1
- 239000005060 rubber Substances 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 229920003051 synthetic elastomer Polymers 0.000 description 1
- 239000005061 synthetic rubber Substances 0.000 description 1
- 229920001187 thermosetting polymer Polymers 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L2201/00—Special arrangements for pipe couplings
- F16L2201/10—Indicators for correct coupling
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L37/00—Couplings of the quick-acting type
- F16L37/08—Couplings of the quick-acting type in which the connection between abutting or axially overlapping ends is maintained by locking members
- F16L37/084—Couplings of the quick-acting type in which the connection between abutting or axially overlapping ends is maintained by locking members combined with automatic locking
- F16L37/091—Couplings of the quick-acting type in which the connection between abutting or axially overlapping ends is maintained by locking members combined with automatic locking by means of a ring provided with teeth or fingers
Abstract
connection fitting (10) for a pipe, including a tubular body (12), an O-ring (14) mountable on outer side of tubular body (12), a substantially tubular collet (16) having a first end and a second end and having a memory, a substantially annular and resilient grab ring (20) for gripping the outer side of a pipe inserted into the collet (16), a substantially tubular spacer ring (22) locatable on the free side of the grab ring (20), a collet retainer (18), and a tubular protection ring (24) locatable within the spacer ring (22), wherein when the collet retainer (18) engages with the collet (16) and causes the collet (16) to lock onto the tubular body (12) apertures (66) in the collet retainer (18) permit portions of the protection ring (24) to be seen after connection of a pipe to the connection fitting (10) is completed. The collet and collet retainer allow easy assembly in the manufacturing process and provide the strength and functionality of the connection fitting for pipe insertion. ide of a pipe inserted into the collet (16), a substantially tubular spacer ring (22) locatable on the free side of the grab ring (20), a collet retainer (18), and a tubular protection ring (24) locatable within the spacer ring (22), wherein when the collet retainer (18) engages with the collet (16) and causes the collet (16) to lock onto the tubular body (12) apertures (66) in the collet retainer (18) permit portions of the protection ring (24) to be seen after connection of a pipe to the connection fitting (10) is completed. The collet and collet retainer allow easy assembly in the manufacturing process and provide the strength and functionality of the connection fitting for pipe insertion.
Description
PIPE CONNECTION FITTING
FIELD OF THE INVENTION
[0001 ] The present ion relates to plumbing and gas pipe
connections. In particular the t invention relates to readily leable
push fit tion fittings or couplings, in which a pipe, tube or conduit
(hereinafter referred to as a tube) can be pushed into the connection fitting and
be retained connected to the tion fitting by internal elements of the
connection fitting.
BACKGROUND OF THE INVENTION
There are a considerable number of connection gs or
couplings for joining pipes or tubes to each other, for example, or to join
appliances or accessories to tubes or pipes. In many instances these connection
fittings are bulky and use a considerable amount of materials because of the
need to provide room within the connection fitting for the assembly of the
component. The connection fitting itself may be difficult to install because of
its size and the space required to accommodate it.
Additionally, some connection gs require the use of tools
and/or additional components to properly seal or make secure the connection
between the connection fitting and the tube or pipe. This can also create
significant problems where space for the connection fitting is limited.
SUMMARY OF THE INVENTION
The present invention aims to rate some or all of the
aforementioned problems in providing a quick connect/disconnect connection
fitting that grips the outside of a tube or pipe and seals on the inside of the pipe.
It is ed that the connection fitting of the invention can be attached to or
incorporated in other in-lined devices, such as valves and other ent, as
well as a plurality of connection fittings being incorporated in in-line joiners,
whether ht-line, angle, or split, such as key-joints or Y-joints, or
otherwise.
[0004A] According to one aspect of the invention there is ed a
connection fitting for a tube or pipe including:
a tubular body having a first end, a second end and a bore which
s from the first end towards the second end, the tubular body being
provided on its outer surface with a circumferential channel for receiving an O-
ring and also with a ramp and a collet-engaging channel at or near the second
end, an outside er of the tubular body at the first end being receivable
within the tube or pipe to which the connection is to be made;
an O-ring mountable in said circumferential channel, the O-ring being
adapted to enter into a sealing relationship with an inner side of a tube or pipe
as the connection with the tube or pipe is effected;
a substantially tubular collet having a first end, a second end and an
internally directed flange at or near the second end, wherein the collet can be
pushed onto the first end of the tubular body until it engages the ramp, and as
pushing continues the collet rides up the ramp and expands until the collet
reaches the collet-engaging channel whereupon the internally directed flange
engages the collet-engaging channel;
a substantially annular and resilient grab ring for gripping an outer side
of the tube or pipe when it is inserted into the connection fitting, the grab ring
being locatable adjacent the first end of the ;
a substantially tubular spacer ring locatable on a free side of the grab
ring adjacent the first end of the collet;
a collet retainer which can be pushed onto the collet causing the collet
to ss until an ng means on the collet retainer engages with the
collet and causes the collet to lock to the tubular body, said collet retainer
ng the grab ring and the spacer ring adjacent the first end of the collet;
a tubular protection ring which, prior to insertion of the tube or pipe, is
locatable within the spacer ring, wherein an outside diameter and inside
diameter of the protection ring at its first end are equal to the outside diameter
and inside diameter of the tube or pipe to be connected to the connection
fitting, the inside of the protection ring being red at its second end to
assist in the insertion of the tube or pipe onto the tubular body and into the
tion fitting.
[0004B] According to another aspect of the invention there is ed a
connection fitting for a tube or pipe, comprising:
a tubular body having a first end, a second end, and a bore which
extends from the first end towards the second end, the r body having an
outer surface with a circumferential channel and a collet engaging member, the
tubular body being receivable within the tube or pipe;
an O-ring mounted in the circumferential channel, the O-ring being
adapted to enter into a sealing relationship with an inner surface of the tube or
pipe;
a substantially tubular collet having a first end and a second end, the
second end of the collet operable to engage the collet ng member to
secure the collet to the tubular body, wherein the collet is configured to be
pushed onto the first end of the tubular body and a cross-section of the collet
expands in order to assist in engaging the collet engaging member;
a substantially annular and resilient grab ring for gripping an outer
surface of the tube or pipe, the grab ring being d adjacent the first end
of the collet;
a substantially r spacer ring mounted adjacent the grab ring;
a collet retainer operable to engage the collet and thereby lock the collet
to the r body, the collet retainer operable to maintain the grab ring and
the spacer ring adjacent the first end of the collet; and
a tubular protection ring mounted within the spacer ring, the protection ring
having a chamfered second end to assist in the insertion of the tube or pipe into
the connection fitting and onto the tubular body.
According to one aspect of the invention there is provided a
connection fitting for a tube or pipe, including a tubular body having a first end
and a second end, the bore of which extends from the first end towards the
second end and which may be blind at the second end, the tubular body being
provided on its outer side with a circumferential channel for receiving an O-
ring and means for engaging with a collet, the e diameter of the tubular
body being receivable within the tube or pipe to which the connection is to be
made; an O-ring mountable in said circumferential channel, the O-ring being
adapted to enter into a sealing relationship with the inner side of a tube or pipe
as the tion with that tube or pipe is effected; a substantially tubular
collet having a first end and a second end and having a memory, so that the
cross-section of ns of said collet are reversibly alterable, which collet
engages by mean of engaging means provided nt its second end with
engaging means provided on the outer side of the tubular body; a substantially
annular and resilient grab ring for gripping the outer side of a tube or pipe
inserted into the collet, the grab ring being locatable adjacent the first end of
the collet; a tubular spacer ring locatable on the free side of the grab ring
adjacent the first end of the collet; a collet retainer provided with engaging
means which engages with the collet and which causes the collet to lock to the
tubular body, said collet retainer locating the grab ring and the spacer ring
adjacent the first end of the collet; and a tubular protection ring locatable
within the spacer ring, the e diameter and inside diameter of which
protection ring at its first end are equal to the outside diameter and inside
diameter of the tube or pipe to be connected to the connection fitting, the inside
of the protection ring being chamfered at its second end to assist in the proper
insertion of the tube or pipe into the connection fitting and onto the tubular
body.
The outer surface of the r body, the inner and outer
surfaces of the collet and the inner surface of the collet er preferably are
circular in cross-section, but may be polygonal in cross-section, subject to the
requirements that these surfaces are similarly contoured so that they can match
up to enable stable engagement and that the circumferential channel on the
outer side of the tubular body is such that the O-ring can enter into a sealing
onship with the inner side of a tube or pipe as the connection with the tube
or pipe is ed. In such stances, the outer es of the spacer ring,
the grab ring and the protection ring would also be correspondingly polygonal
in cross-section to enable matching with the collet and collet retainer.
A significant feature of the present invention is the use of a
collet and collet retainer to hold and locate other components relative to the
r body of the connection fitting. The collet and collet er, together
with the O-ring, grab ring, spacer ring, protection ring and body, can be easily
assembled to form a connection fitting, using basic hand tools. The
combination of collet and collet retainer give the connection fitting strength to
secure a pipe connection. The protection ring aids easy pipe insertion. The
pipe, when inserted, prevents the collet from collapsing inwards and helps
strengthen the pipe joint.
The invention envisages the use of a push connection fitting on a
variety of pipes including, but not limited to, copper pipes, polyethylene pipes
(PE), polybutylene pipes (PB), polyethylene raised temperature pipes (PE-RT),
cross-linked polyethylene pipes (PEX), multi-layer pipes, e.g., cross-linked
polyethylene-aluminium-cross-linked polyethylene pipes (PEX-AL-PEX), or
chlororinated polyvinyl chloride pipes (CVPC). The connection fitting is
designed to seal on the inside of the pipe, using an O-ring, and to grip the pipe
on the outside, using a grab ring. The connection fitting can be t only, or
connect/disconnect, and can be a stand-alone fitting, or can be ctured as
part of an end connection for valves. It is to be understood that a plurality of
connection fittings can be incorporated in the one device such as in-line
joiners, T-joints and Y-joints. A range of ent sized connections can be
made so as to cover all conventional plumbing/gas pipe sizes.
DETAILED DESCRIPTION OF THE INVENTION
An advantage of the ion relates to the making of a pipe
tion fitting quickly and economically. Preferably, the design of the
connection fitting incorporates a plastic collet and stainless steel collet retainer.
While other als may be used, it is important that they be suitable for the
uses to which the collet retainer is put. The preferred materials used in these
components allow for simple cost effective manufacturing and assembly. The
g of the pipe is performed by an O-ring on the tubular body which seals
on the inside of the pipe. Sealing on the inside of the pipe allows the body and
other components of the connection to be smaller in their diameters, which
requires less material. This design allows lower cost al and lower
cturing cost. The invention allows a more cost effective tion
fitting to the market.
The tubular body can be composed of a thermoplastics material
or a thermosetting plastics material. Alternatively, it may be composed of a
metal or metal alloy, such as a brass. Preferably it is formed from a
thermoplastics material (which is a relatively cheaper material than a metal
alloy) by moulding, although a combination of moulding and machining may
be used. The tubular body material is preferably a material which does not
react with, or leach into, water or other fluids. The outside diameter of the
tubular body is less than the inside diameter of the pipe to which connection is
to be made so that the tubular body can pass within the open end of the pipe
during the process of tion of the pipe to the connection fitting. The outer
side of the tubular body (which may be substantially circular or polygonal in
cross-section) is provided with a ferential channel for receiving and
retaining an O-ring and with means for engaging a collet, preferably in the
form of a circumferential ramp terminating in a channel at or adjacent to the
second end of the tubular body.
Preferably, the , which can be composed of a
thermoplastics material and which is lly cylindrical (but which may be
polygonal in cross-section), has a first plurality of, more preferably four,
equally spaced slots g at the second end of the collet and running
through to a plurality of, more ably four, collet tabs disposed towards the
first end of the collet. This plurality of slots allows the collet to expand when it
is pushed onto the circumferential ramp of the tubular body. The collet can
then ride up the circumferential ramp and an inwardly ing flange on the
inside of the collet at the second end of the collet engages and retracts into the
circumferential channel at the second end of the tubular body. The collet and
tubular body are locked together, at this stage of assembly. Preferably, the
collet has a second plurality of, more preferably four, slots equally spaced and
opening at the first end of the collet, the second plurality of slots being equally
spaced between each collet tab and the first plurality of slots. The second
plurality of slots allows the collet to collapse inwards as the collet retainer is
attached. The collet tabs have ramps, assisting the collet to compress when the
collet retainer passes over the first end of the collet. The ity of tabs on the
collet can subsequently be lined up with a plurality of corresponding slots in
the collet retainer.
The collet retainer, which is generally cylindrical (but which
may be polygonal in cross-section), preferably is made of stainless steel for
strength. The inside er and outside diameter at the outer or first end of
the collet retainer is reduced compared to the rest of the collet retainer by
means of an ly extending shoulder. The collet retainer is provided with a
plurality of slots, preferably four, spaced equidistantly around its
circumference. The role of this ity of slots is to engage the plurality of
collet tabs and to prevent the collet from expanding and disengaging from the
tubular body.
The O-ring is flexible and can be resiliency distorted from its
normal annular configuration for the purpose of tubing a sealing relationship
with the pipe. It can be formed from any suitable elastomeric material, such as
synthetic rubber, for example, silicones or ethylene ene diene monomer
rubbers, thermoplastic elastomers, polyolefins, polyurethanes, etc. Preferably it
is formed from a material that does not react with, or leach into, water.
Positioning of the body and O-ring on the inside of the pipe gives the pipe
internal support.
The grab ring can be formed of any suitable material. Stainless
steel or spring steel can be used and are preferred als, although brass
alloys and copper may suffice. The grab ring can take the form of a
ntially annular ring from which depends a plurality of radially inwardly
extending projections or teeth, which in the assembled connection fitting are
also directed towards the second end of the collet, i.e., towards the r
body. These projections or teeth preferably are spaced equally about the grab
ring. The grab ring can be split n adjacent projections or teeth.
The collet retainer locks the collet to the body. The tabs on the
collet in turn lock the collet retainer, when the collet tabs click in to the slots on
the collet retainer. The grab ring and spacer are inserted into the collet retainer,
before it is attached to the collet. When the collet er is in the locking
position on the collet, the tubular body, collet retainer, grab ring, and spacer
ring are all contained as a stable ly. The collet, collet retainer and grab
ring give support to the outside of the fitting, resulting in a strong and secure
connection.
The protection ring at its outer or first end has the same size
outside diameter and inside diameter as the pipe to be connected to the
connection fitting. The protection ring is designed to centre the collet to the
tubular body, protect the O-ring from contamination, compress the O-ring
when inserting the pipe and indicate when the pipe is fully ed. The
tion ring is designed with a large chamfer on its inner or second end.
This chamfer allows the O-ring to be compressed when inserting the pipe. With
the chamfer on the protection ring, there is no need to chamfer the open end of
the pipe, which is advantageous. When the pipe is inserted to the fitting, the
pipe pushes on the back of the protection ring and when the protection ring
comes in contact with the O-ring the O-ring is compressed, allowing the pipe to
follow over the O-ring. Preferably, the protection ring is bright in colour, for
sighting the protection ring when the pipe is fully inserted. The appearance of
this feature in the apertures in the collet and collet retainer indicates full pipe
insertion. When the protection ring is inserted at this part of the assembly
stage, the collet is unable to collapse and disengage from the collet retainer.
When a connection is made, the pipe pushes the protection ring to the end of
the fitting. The pipe takes the place of the tion ring to hold the collet
open against the collet retainer. On completion of connection, the protection
ring becomes the pipe depth indicator.
The invention allows for easy and quick pipe insertion. When
using the t pipe cutting tool on PEX or PEX-AL-PEX pipe, there is no
requirement to chamfer the pipe. When connection is made with this fitting, the
protection ring is designed with a chamfer, to provide O-ring compression
when pipe is inserted.
Significant advantageous features of this invention include the
ion of the , ess steel collet er and the protection ring.
The collet and collet retainer allow easy assembly in the manufacturing process
and provide the th and functionality of the connection fitting for pipe
insertion. As mentioned previously, the protection ring has a number of
ons, the combination of which al so provides significant advantages.
The design of the connection on the ion can be
incorporated into, or attached to, other in-line devices, such as valves and other
equipment. The end connection can be integral to valves or other equipment.
The size of the connection can be selected so that a range of connections cover
all conventional and non-conventional plumbing and gas pipe sizes and almost
all pipe materials.
The connection g is assembled substantially as follows: the
O-ring is located in the O-ring engaging circumferential channel on the tubular
body. The collet is then pushed onto the tubular body until it s the ramp
on the tubular body. Under continued pushing the forward portion of the collet
rides up the ramp and a forward cross-section of the collet expands preferably
by increased separation of forward portions of the collet due to forward
opening collet slots. This expansion continues some until the collet reaches the
collet engaging channel in the tubular body whereupon the forward crosssection
of the collet ceases to expand and an internally directed flange at the
forward end of the collet engages with and is located within the collet engaging
channel on the tubular body. The spacer ring and grab ring are then placed
inside the collet retainer with the spacer ring being located first within the
collet retainer and then the grab ring. The collet retainer assembly is then
located on the t and pushed over the collet. This causes the rear or outer
end of the collet to compress, preferably via the compression of rear portions of
the collet due to slots opening s the rear or outer end. Tabs on the collet,
which are provided with ramps, assist in this procedure by making it easier to
push the collet retainer assembly onto the collet. The collet retainer assembly is
r pushed onto the collet until the inner end of the collet retainer meets an
external flange provided at the inner end of the collet. The collet retainer
assembly is rotated around the collet until tabs on the collet click into the collet
er slots. The rear or outer end of the collet is then allowed to expand and
return to its pre-compression state. As a result the collet retainer is locked onto
the collet and this also locks the collect onto the tubular body. The protection
ring is pushed into and located within the spacer ring within the collet retainer
and is further pushed towards the r body until it reaches the grab ring in
the collet retainer assembly. The connection fitting is now ready for insertion
of a tube or pipe. Because the protection ring has the same internal and external
diameters as the pipe which the connection fitting is intended, the grab ring can
grab the tion ring and hold it in place until insertion of the pipe. When a
pipe is inserted the pipe pushes on the outer end of the tion ring and
moves it towards the tubular body. The protection ring is chamfered on its
inner side and compresses the O-ring as it is pushed further towards the tubular
body. This also permits the pipe to ride more easily over the O-ring. There is
no need to chamfer the open end of the pipe. As further pushing of the
protection ring continues because of further pushing of the pipe into the
connection fitting, the protection ring travels further along the r body
until it meets a ramp on the tubular body and can move no further. At this point
the pipe is being ed fully into the connection fitting. Apertures in the
collet retainer and collet allow the protection ring to be seen. As the protection
ring preferably is brightly coloured it can be y identified and this
indicates that the pipe has been fully inserted into the connection fitting.
BRIEF DESCRIPTION OF DRAWINGS
In order that the invention may be more clearly understood a
preferred embodiment is hereinafter described and shown in the drawings in
which:
Figure 1 is an exploded view of a red embodiment of the
invention;
Figure 2 is a perspective view of an integral pair of tubular
bodies according to a preferred embodiment of the invention;
Figure 3 is a view from one end of the body shown in Figure 2;
Figure 4 is a udinal cross-section along line A-A of
Figure 3;
Figure 5 is a ctive view from the distal end of a collet
according to a preferred embodiment of the invention;
Figure 6 is a side view of the collet shown in Figure 5 with the
distal end being on the right;
Figure 7 is a view from the distal end of the collet shown in
Figure 5;
Figure 8 is a view of the proximal end of the collet shown in
Figure 5;
Figure 9 is a longitudinal cross-section along line A-A of Figure
Figure 10 is a perspective view from the proximal end of the collet
retainer according to a preferred ment of the invention;
Figure 11 is a side view of the collect retainer shown in
Figure 10 the distal end being on the right;
Figure 12 is a view from the proximal end of the collet retainer
shown in Figure 10;
Figure 13 is a longitudinal cross-section along line A-A of
Figure 12;
Figure 14 is a perspective view from the distal end of a spacer
ring according to a preferred embodiment of the invention;
Figure 15 is a view from the distal end of the spacer ring shown
in Figure 14;
Figure 16 is a longitudinal cross-section view along line A-A of
Figure 15;
Figure 17 is a perspective view from the proximal side of a grab
ring ing to a preferred embodiment of the invention;
Figure 18 is an end view from the proximal side of the grab ring
shown in Figure 17;
Figure 19 is a side sectional view of the grab ring shown in
Figure 18;
[0041 ] Figure 20 is a perspective view from the distal end of a
protection ring according to a red embodiment of the t invention;
Figure 21 is a view from the distal end of the protection ring
shown in Figure 20;
Figure 22 is a sectional view along line A-A of Figure 21;
Figure 23 is a perspective view of a pair of assembled
connection fittings prior to connection of the left hand connection fitting to a
pipe or tube.
Figure 24 is a longitudinal sectional view through the assembled
pair of tion fittings of Figure 23;
Figure 25 is a longitudinal sectional view through the assembled
pair of connection fittings during the process of connecting a pipe or tube to the
left hand connection fitting;
Figure 26 is a udinal sectional view through the assembled
pair of connection fittings at the completion of connection of a pipe or tube to
the left hand connection fitting.
DESCRIPTION OF PREFERRED EMBODIMENT
In the drawings the l 10 designates generally a pair of
connection fittings according to a red embodiment of the invention, one
of the connection fittings 10a being shown in the assembled form and the other
10b being shown in an exploded view. Here, the tion fittings 10a and
10b are integrated to form an in-line joining means. In the following
description, comments will be limited to that part of the pair of connection
gs shown in the exploded view in Figure 1, i.e., 10b.
In the exploded view the configurational relationship between
the ents of the red embodiment connection fitting can be seen.
The terms "proximal", and "distal", in the above identification of the drawings
and in the ing description is used to indicate those ends of the
components which are, respectively, closer to the mid-point of the pair of
connection fittings 10, and further from the mid-point of the pair of connection
fittings 10.
Tubular body 12, forming part of tion fitting 10b, is
composed of a plastics al and has a m bore 26, the distal end 28 of
which is chamfered 30. Adjacent the mid-point 32 of the integral pair of
tubular bodies, i.e., at the proximal end of tubular body 12, there is provided,
on the outer side 38 of tubular body 12, a collet-engaging channel 34 on the
distal side of which is disposed a ramp 36. Both collet-engaging channel and
ramp 36 circumscribe tubular body 12. Disposed on the outer side 38 and
toward the distal end of tubular body 12 is an O-ring-engaging channel 40,
which circumscribes the outer side 38.
[0051 ] The O-ring 14 is a typical O-ring, dimensioned to be engaged
and restrained from movement by the O-ring-engaging channel 40. The distal
end of the outer side 38 of the tubular body 12 is also chamfered 42.
The collet 16 is comprised of spring steel. It is generally
cylindrical and is provided with four slots 44 opening at the proximal end and
an additional four slots 45 opening at the distal end, and four tabs 46 evenly
spaced around the circumference. At the proximal end is provided an external
flange 48 and an ally directed flange 49, both intersected by the
proximally directed slots 44. The flange 48 is chamfered 50 on its proximal
side. The internal wall 52 of the collet is chamfered 54 at its distal end 56.
The collet er 18 is also generally rical and is
composed of ess steel. The distal end 58 is chamfered 60 into an opening
62 with a ly narrower diameter than the bore 64 of the main part of the
collet retainer 18. Four slots 66 are disposed circumferentially at even intervals
around the body of the retainer 18.
Grab ring 20 is formed from spring steel and takes the form of a
substantially angular ring 68 from which depends a plurality of radially
inwardly extending teeth 70. The teeth 70 are spaced equal distantly around the
inner edge of the ring 68. The grab ring 20 is initially formed as a flat blank.
Then the teeth 70 are pushed out of the plane of the ring 68 so that they project
in a proximal direction at an angle to the plane of the ring 68 with the
innermost edges 72 of the teeth 70 being sharp to aid in engagement with the
pipe or tube following insertion of the same into the connection fitting and
y restrain the pipe or tube from being subsequently withdrawn from the
connection fitting.
The spacer ring 22 is formed from a plastics al. It is
generally cylindrical with a ridge 74 being formed on the outer side 76 towards
the proximal opening 78 and chamfers 80, 82 on the outer side 76 and inner
side 84 at the distal opening 86. The diameter of the spacer ring 22 is otherwise
constant.
The protection ring 24 is also generally cylindrical, although its
internal diameter at the proximal end 88 is greater than at the distal end 90,
there being a radially ly directed annular ramp 92 extending from a
point adjacent the distal end 90 to a point adjacent the proximal end 88 of the
protection ring 24, thereby defining two inner rings of differing diameters
joined by a smooth ramp section. The protection ring is ly coloured so as
to provide a visual indication of the completion of the tion of a pipe to
the connection g.
The assembly procedure starts with the locating of the O-ring 14
in the O-ring-engaging channel 40 on the tubular body 12. The collet 16 is then
pushed on to the tubular body 12 until it engages ramp 36. As pushing
ues the collet 16 rides up ramp 36 and the collet 16 expends via the four
proximally-opening collet slots 44 until collet 16 reaches the collet-engaging
channel 34 on the tubular body 12 whereupon the collet 16 ceases to expand
and the internally directed flange 49 at the proximal end of collet 16 engages
with, and is located in, the collet-engaging channel 34.
Spacer ring 22 and grab ring 20 are placed inside collet retainer
18, grab ring 20 being located proximally in on to spacer ring 22. The
resulting collet retainer assembly is then located onto the collet 16 and the bore
64 of the collet retainer 18 encompasses the outer side of collet 16. As a small
amount of force is applied to push the collet retainer 18 onto the collet 16 the
collet 16 sses via the four distally-opening slots 45. Tabs 46 on the
collect 16 are ed with ramps 47 (as can be seen in Figures 5, 6 and 9)
which assist in this procedure by making it easier to push the collet retainer
assembly onto collet 16. The collet retainer assembly is pushed onto collet 16
until the al end of the collet retainer 18 meets external flange 48
provided at the proximal end of collet 16. Keeping the collet 16 stationary, the
collet retainer assembly is rotated around the collet 16 until the four collet tabs
46 click into the four collet retainer slots 66. Collet 16 is then allowed to
expand and return to its pre-compression state. The collet retainer 18 is now
locked onto collet 16 and has also locked collet 16 onto the tubular body 12.
Spacer ring 22 and grab ring 20 are now secured inside the collet retainer 18.
The protection ring 24 is pushed into and located within the
spacer ring 22 and is pushed proximally with respect to the tubular body 12
until it reaches the grab ring 20 in the collet retainer assembly. The tion
ring 24 has the same internal and external diameters as the pipe for which the
connection fitting 10b is intended. This allows the grab ring 20 to grab the
protection ring 24 and hold it in place until insertion of the pipe. The protection
ring 24 also s onto the tubular body 12 which assists in centering the
collet 16, grab ring 20, spacer ring 22 and collet retainer 18 onto the tubular
body 12. Further, the protection ring 24, by locating on r body 12 and
being inside the spacer ring 22, protects the O-ring 14 from contamination by
foreign matter prior to pipe ion. Figure 24 shows in cross-section an
assembled pair of connection fittings 10 prior to pipe insertion.
When a pipe is ed the pipe 100 pushes on the distal end of
the protection ring 24. As the protection ring 24 is moved proximally within
the tion fitting it compresses O-ring 14 and permits the pipe 100 to ride
more easily over the O-ring 14, without the need to chamfer the open end 102
of the pipe 100. As proximal movement of the tion ring 24 continues,
due to further pushing of the pipe 100 into the connection fitting, the protection
ring 24 continues to travel proximally until it meets the ramp 36 and can move
no further. At this point the pipe has been inserted fully into the connection
fitting. With the protection ring 24 being brightly coloured and resting t
ramp 36 it becomes visible h the ally opening slots 44 in the
collet 16. This indicates that the pipe has been fully inserted into the
connection fitting.
It is to be understood that the invention may embrace many
further modifications as would be readily apparent to persons skilled in the art
and which would be deemed to reside within the broad scope and ambit of the
invention. The preferred embodiment described above is by way of example
only and is not to be considered as limiting.
Throughout this specification and the claims which follow,
unless the context requires otherwise, the word "comprise", and variations such
as "comprises" and "comprising", will be understood to imply the inclusion of
a stated integer or step or group of integers or steps but not the exclusion of any
other integer or step or group of integers or steps.
The reference to any prior art in this ication is not, and
should not be taken as, an acknowledgment or any form of suggestion that the
prior art forms part of the common general knowledge.
Claims (9)
1. A connection fitting for a tube or pipe, including: a tubular body having a first end, a second end and a bore which extends from the first end towards the second end, the r body being provided on its outer surface with a circumferential channel for receiving an O- ring and also with a ramp and a collet-engaging channel at or near the second end, an outside diameter of the tubular body at the first end being receivable within the tube or pipe to which the connection is to be made; an O-ring mountable in said circumferential l, the O-ring being adapted to enter into a g relationship with an inner side of a tube or pipe as the connection with the tube or pipe is effected; a substantially tubular collet having a first end, a second end and an ally directed flange at or near the second end, wherein the collet can be pushed onto the first end of the tubular body until it engages the ramp, and as pushing continues the collet rides up the ramp and expands until the collet reaches the collet-engaging channel whereupon the internally directed flange s the collet-engaging channel; a ntially annular and ent grab ring for gripping an outer side of the tube or pipe when it is inserted into the connection fitting, the grab ring being locatable adjacent the first end of the collet; a substantially tubular spacer ring locatable on a free side of the grab ring adjacent the first end of the collet; a collet er which can be pushed onto the collet causing the collet to compress until an engaging means on the collet retainer engages with the collet and causes the collet to lock to the tubular body, said collet er locating the grab ring and the spacer ring adjacent the first end of the collet; a tubular protection ring which, prior to insertion of the tube or pipe, is locatable within the spacer ring, wherein an outside diameter and inside diameter of the protection ring at its first end are equal to the outside diameter and inside diameter of the tube or pipe to be connected to the connection fitting, the inside of the protection ring being chamfered at its second end to assist in the insertion of the tube or pipe onto the tubular body and into the connection fitting.
2. A tion fitting for a tube or pipe, comprising: a tubular body having a first end, a second end, and a bore which extends from the first end towards the second end, the tubular body having an outer e with a circumferential channel and a collet engaging member, the tubular body being receivable within the tube or pipe; an O-ring mounted in the circumferential channel, the O-ring being adapted to enter into a sealing onship with an inner surface of the tube or pipe; a substantially tubular collet having a first end and a second end, the second end of the collet operable to engage the collet ng member to secure the collet to the tubular body, wherein the collet is configured to be pushed onto the first end of the tubular body and a section of the collet expands in order to assist in ng the collet engaging member; a substantially annular and resilient grab ring for gripping an outer surface of the tube or pipe, the grab ring being mounted adjacent the first end of the ; a substantially tubular spacer ring mounted adjacent the grab ring; a collet retainer operable to engage the collet and thereby lock the collet to the tubular body, the collet retainer operable to maintain the grab ring and the spacer ring adjacent the first end of the collet; and a tubular protection ring mounted within the spacer ring, the protection ring having a chamfered second end to assist in the insertion of the tube or pipe into the connection g and onto the tubular body.
3. The connection fitting as claimed in claim 1 or claim 2, wherein the outer surface of the tubular body, the inner and outer surfaces of the collet and the inner surface of the collet retainer are circular in cross- section.
4. The connection fitting as claimed in any one of claims 1 to 3, wherein the outer surface of the tubular body, the inner and outer surfaces of the collet and the inner surface of the collet retainer are nal in cross-section, subject to the requirement that these es match up to enable stable engagement.
5. The connection fitting as claimed in any one of claims 1 to 4, wherein the collet includes one or more apertures which permit portions of the protection ring to be seen after connection of the tube or pipe to the connection fitting is completed.
6. The connection fitting as d in any one of claims 1 to 5, wherein the bore of the tubular body is blind at its second end.
7. The connection fitting as claimed in any one of claims 1 to 6, wherein the collet includes spring steel.
8. The connection fitting as claimed in any one of claims 1 to 7, wherein the spacer ring is formed from a plastic material.
9. The connection fitting as claimed in any one of claims 1 to 8, wherein the protection ring is brightly coloured.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU2013904959A AU2013904959A0 (en) | 2013-12-19 | Pipe Connection Fitting | |
AU2013904959 | 2013-12-19 | ||
PCT/AU2014/050427 WO2015089583A2 (en) | 2013-12-19 | 2014-12-17 | Pipe connection fitting |
Publications (3)
Publication Number | Publication Date |
---|---|
NZ721246A NZ721246A (en) | 2020-09-25 |
NZ721246B2 true NZ721246B2 (en) | 2021-01-06 |
NZ714700B2 NZ714700B2 (en) | 2021-01-06 |
Family
ID=
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