Pipe joints or couplings – With fluid pressure seal – Flexible lip
Patent
1987-01-05
1989-04-18
Arola, Dave W.
Pipe joints or couplings
With fluid pressure seal
Flexible lip
285320, 285340, 285423, F16L 1702
Patent
active
048220787
DESCRIPTION:
BRIEF SUMMARY
This invention relates to a fitting intended to provide a sealing connection between a tube and the fitting.
This can variously be described as a hose coupling or a fitting.
The problem to which this invention is directed is to provide a fitting of this type which can provide both a liquid seal and means for holding the tube within the fitting where the fitting as a whole is an integral moulding.
The invention can accordingly be said to reside in a fitting facilitating a sealing connection with a tube to provide a liquid seal, the fitting having an aperture to receive a tube therein, the fitting being comprised of a plastics material and having a circumferentially continuous inwardly extending lip integral with the housing of the fitting, the lip being attached to the housing by a portion of reduced thickness and adapted thereby and by the position of such reduced thickness portion, to be pivotal about such portion of reduced thickness.
In preference the lip has an innermost face which is of continuous constant shape.
In preference the fitting is integrally formed of a plastics material of a type such that the portion of reduced thickness will provide a pivotal effect for the inner portion of the lip while being sufficiently stiff to substantially resist deformation about any axis radially aligned with respect to the fitting, while being able to expand and contract circumferentially. By having the lip having a cross-sectional shape of a wedge, provides for this feature of being able to resist buckling deformation, while at the same time being able to expand and contract circumferentially in concert with pivotal action about the portion of reduced thickness.
In order to limit the extent to which the pivotal action can extend, there are provided a plurality of segmented tails secured to the lip.
By appropriate selection of the shape of the lip, the location and shape of the tails, and these in conjunction both with the plastics type and the shape and type of tube to be secured, it has been found that a very excellent fitting being a one off integral mould, can be provided which can provide both an effective liquid seal as well as strong mechanical engagement especially when there is internal liquid pressure which can have the effect of causing the lip to engage more strongly the external surface of the gripped tube.
Significant savings are made because there is no subsequent assembly necessary, for instance, a sealing ring or a tightening ring as has hitherto been necessary. Furthermore, in use, the tube needs only to be inserted into the fitting to be secured thereto. This can provide significant savings in respect of the time taken to install an irrigation system.
For a better understanding of the invention it will now be described with respect to the preferred embodiment which shall be described with the assistance of drawings in which :
FIG. 1 is an end view of a fitting according to the embodiment;
FIG. 2 is a cross-sectional view along lines 2--2 of FIG. 1;
FIG. 3 is the same view of the fitting as in FIG. 2 incorporating, however, an approaching tube;
FIG. 4 is a detail from FIG. 3 showing the arrangement upon further entry of the tube; and
FIG. 5 is the same detail as in FIG. 4 showing the arrangement upon an expected attempt to withdraw the tube and when under liquid pressure.
Referring in detail to the drawings, a lip 1 is shown as a peripheral portion within the fitting 2 having an innermost sharp corner at 3 which is of lesser diameter than an outermost corner at 4.
The shape of the lip 1 is continuous and consistent around the annular path and provides there a continuous inner face defining a frusto-concial area at 5.
The fitting 2 is intended for a tube of circular cross-section and accordingly has itself a circular cross-section having a central axis at 6.
The lip 1 has an inner face at 7 inclined at 18.degree. to the axis 6. The sides of the lip 1 at 8 and 9 are inclined at 75.degree. to the axis 6.
There is a portion of reduced thickness at 10 which thereby connects the lip 1 to the housing
REFERENCES:
patent: 3249373 (1966-05-01), Goldstein
patent: 4637618 (1987-01-01), Valls
Arola Dave W.
Vinidex Tubemakers Pty. Limited
LandOfFree
Hose coupling does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Hose coupling, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Hose coupling will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2392806