Pipe joints or couplings – Essential catch – Leaf spring
Patent
1987-11-17
1990-05-08
Callaghan, Thomas F.
Pipe joints or couplings
Essential catch
Leaf spring
285903, 285921, F16L 3712
Patent
active
049232274
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a liquid tight connector for corrugated piping or conduit.
With existing corrugated flexible conduit for drainage or electrical work, the only available methods of joining involves encasing the joint and gluing to ensure an adequate join. This type of joint must be left, so that the glue or adhesive sets, to ensure a successful join. This takes the tradesman additional time, and the chemistry of the glue weakens the conduit and the connector cannot be reused.
The present invention seeks to ameliorate this problem by providing a push-on connector which provides a liquid tight seal without the aid of adhesives, and which is reusable and adjustable during installation.
In one broad form the invention provides a liquid tight connector, for affixing, in a liquid tight manner, to a conduit having a ridge located adjacent to its end, comprising:
a body open at one end to receive a conduit in a bore communicating with said open end;
sealing means, in said bore, remote from said open end, which are adapted to seal against, in a liquid tight manner, the conduit pushed into the said bore; and
locking means located in said body so as to project into the said bore so as to lock onto the ridge of conduit in said bore, so as to hold in said bore said conduit in a liquid tight seal against the said sealing means.
Preferably the sealing means is a tapered section of said bore which is adapted to compress and seal against the flexible conduit pushed into said bore.
The connector of the present invention can be utilised with any form of fittings, such as elbows, junctions, Y and T pieces, terminators, junction boxes, or fittings joining corrugated piping to rigid piping or corrugated piping to corrugated piping.
The present invention will now be described by way of example with reference to the accompanying drawings in which:
FIG. 1 illustrates a perspective view of a connector according to an embodiment of the present invention;
FIG. 2 illustrates a sectional view of the connector illustrated in FIG. 1 with a corrugated conduit connected therein; and
FIGS. 3a, 3b and 3c are part sectional views illustrating steps in the moulding of the locking means of the embodiment shown in FIG. 1.
One embodiment of the present invention is illustrated in FIGS. 1 to 3 of the accompanying drawings. The connector 1 comprises a housing 2 having an open end 3 for insertion of the corrugated piping to effect connection thereto. The other end 4 is shown for threaded connection to a junction box or the like. However, this end could be designed for any type of connection or fitting. The bore 5 is chosen so as to be slightly oversize to the outer diameter of the corrugated flexible tubing.
The bore 5 is shown in FIG. 2 has a tapered section 6 located, remote from the end 3 and terminating in an annular shoulder 7, with a smaller diameter bore 8, in communication therewith. The shoulder could be of any desirable width.
Located intermediate the ends of the bore, in the constant diameter section, are two resilient locking members 9 formed in the walls of said bore 5, and having projections 10 which extend into the bore 5.
Thus, in clamping the connector 1 to a corrugated flexible piping as shown in FIG. 2, the piping is pushed into the bore 5; the projection 10 being so shaped that the corrugations bear on the ramp 11 and force projections 10 back out of the bore. The piping is then pushed into the tapered section 6 where it may abut against the annular shoulder 7. As the piping is forced further into the tapered section 6, the piping is compressed by the increasingly narrowing diameter of the tapered section, to form a liquid tight seal therewith. The projections 10 lock into a valley of the corrugations of the piping, such that the face 12 of the projection abuts up against a ridge of the corrugations, to prevent the piping from being withdrawn from the bore 5; the ridges being in a liquid tight seal against the walls of the tapered section.
In another form of the invention the tapered section of the bore could be r
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McNeil Sandy
Petty John
Callaghan Thomas F.
Elconnex Lty Limited
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