Pipe joints or couplings – Connector for conduit housing electromagnetic line:
Patent
1982-11-16
1985-07-02
Arola, Dave W.
Pipe joints or couplings
Connector for conduit housing electromagnetic line:
285DIG16, F16L 3902
Patent
active
045264104
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a plastic connector for hoses. A connector, composed of a plastic which can be injection-moulded, already belongs to the prior art (German Auslegeschrift No. 2,654,377), this connector being for hoses having wall-parts which are composed of an elastomeric material, and having a helical cavity which is located, hidden, in the wall, in which cavity the connector is attached, by the injection-moulding technique, and is positively anchored to the wall of the hose. In detail, the connector is injection-moulded in such a manner that it possesses a helical run-out end, which is injection-moulded into the helical cavity and merges, as the actual connector, integrally into the connecting-profile which is located axially in front of it. Furthermore, it is known, in this context, that during the formation of the helical cavity, by means of reinforcing-spirals running, parallel and spaced apart, between the inner and outer walls of the hose, a short portion of the outer wall, and of the reinforcement, is removed, and a cylindrical plastic sleeve is formed in this region, in contact with the inner wall. This design of the connector prevents, to a substantial extent, the medium, which is to be led through the hose, from penetrating into the cavity of the hose, which can otherwise lead to the destruction of the hose or, if the outer wall, or outer flexible tube, is transparent, at least gives rise to an unsightly appearance. It has been found, however, that, despite filling the helical cavity, in the region of the connector, with the injected helical run-out end, moisture can still penetrate into the cavity, especially when reinforcing threads are located on the inner flexible tube. These reinforcing threads can absorb moisture at the joints between the front end-surface of the hose and the oppositely-located, inner surface of the connector, and they can conduct the moisture into the helical cavity, since these joints have a comparatively small area and, for this reason, seal poorly under certain conditions. If a metal sleeve is additionally pushed over the end of the hose, as known per se, and a further metal sleeve is pushed into the hose, crimping the end of the hose enables the reinforcing threads to be gripped more securely. However, these two metal sleeves significantly increase the cost of manufacture, and do not even enable the helical cavity to be sealed completely, unless they are specially sealed at their points of contact with the injection-moulding.
The helical run-out end of the connector is also intended to produce a hose-connection which is particularly secure in the mechanical sense. However, the problem of kinking the hose, at that end of the connection nearer the hose, is only partially solved by means of the helical run-out. When the outer and inner metal sleeves are additionally used, the problem of kinking is, rather, rendered more acute, since a sudden transition from the virtually rigid sleeves to the flexible hose occurs at that end of these sleeves which is nearer the hose.
In addition, a high-pressure hose-fitting is known, which comprises a hose-sleeve, with the actual connecting-profile, an end, with a thread of the sawtooth type, and a bore, which possesses a comparatively large diameter and adjoins this thread. The bore is continued by a smaller, cylindrical bore, into which it is possible to insert an inner hose-nozzle, which possesses a head-like, thickened end-portion. The hose is pushed onto the hose-nozzle and is installed in the hose-sleeve, with this nozzle, in such a manner that the end-portion produces a seal as a result of line-contact with the conical bore into which it is pressed. In order to ensure the secure attachment of the rubber hose, both the hose-sleeve and the hose-nozzle must be essentially unyielding, so that a small portion of the hose-nozzle, which portion projects beyond the hose-sleeve, cannot deform appreciably, even when the hose is bent. This high-pressure hose-fitting is unsuitable for use with hoses having a wall which is composed of
REFERENCES:
patent: 2277397 (1942-03-01), Graham
patent: 2447697 (1948-08-01), Gotschall
patent: 2561351 (1951-07-01), Fentress
patent: 3224795 (1965-12-01), Conley
patent: 3757827 (1973-09-01), Seiwert et al.
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