Pipe joints or couplings – With assembly means or feature – Molded joint facilitator
Patent
1994-07-20
1996-10-29
Melius, Terry Lee
Pipe joints or couplings
With assembly means or feature
Molded joint facilitator
285236, 285291, 285423, 264513, 138109, F16L 4700
Patent
active
055689442
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a resin hose connecting structure suitable for use as a connecting structure in which an air duct hose, a filler hose or the like is connected with a mating member.
BACKGROUND ART
For example, in the case of an air hose, a filler hose or the like, it is recently examined and actually practiced that a resin hose is used instead of a rubber hose. The resin hose has the following advantages. The resin hose is capable of decreasing weight of the hose in comparison with the rubber hose since the specific gravity of resin is small. The resin hose is capable of forming an integral-mold article comprising a soft portion and a hard portion. The resin hose is capable of selecting a design for a hose-configuration and so on optionally.
In the case of the resin hose, a hard resin material is used as a portion requiring hardness, a soft resin material is used as a portion requiring softness, and it can be accomplished that the hard hose-portion and the soft hose-portion are molded integrally by using two kinds of resin-material.
On the other hand, in the case of the rubber hose, it is difficult to accomplish that the hard hose-portion and the soft hose-portion are molded integrally. In the case of the rubber hose, in general, a metal pipe is used as a portion requiring hardness, a rubber hose is used as a portion requiring flexibility, and thereby both are constructed together.
In the case of the resin hose, as understood from the above-described, the number of parts can be decreased and a production cost can be decreased since the integral-mold hose is formed by molding the soft portion and hard portion together.
In the case of the resin hose, to select the design for a hose-configuration and so on optionally, which means that the hose is sufficiently endurable against deformation when a negative pressure is applied on the hose. In the case of the rubber hose, for example, providing that the hose is in a flat-shape in cross-section, the flat-shape portion is likely to deform. Accordingly, the selection of the design for hose-configuration and so on is restricted in comparison with the resin hose.
By the way, in the case of the resin hose, a blow molding method is preferably used to form the hose. In the blow molding method, a tubular or a bladder-like parison is swelled by blowing an air so that the parison is closely adhered to an inner surface of the mold-die. As a result, the parison is formed in the predetermined shape. Thus, the outer surface of the mold-hose is accurately formed in the predetermined shape by the mold-die, but the inner surface of the mold-hose is formed under the free condition. Therefore, the inner surface of the mold-hose shows bad characteristics in its shape and dimensional accuracy.
In the hose, a mating member is inserted into the inside of the hose-end portion constituting a connecting portion, and both are connected together. In this arrangement, it is required that sealing capacity can be ensured between the mating member and the connecting portion. Providing that the mold-hose shows bad characteristics in its shape and dimensional accuracy, namely, that defects such as an unevenness thickness, an unevenness dimension, a biased thickness, and a ruggedness are generated, the sealing capacity can't be ensured satisfactorily between the mating member and the connecting portion.
Then, in the case of the aforementioned resin hose formed by the blow molding method, the inner surface is polished for finishing-treatment so that the inner surface of the hose is formed in the predetermined accurate shape and dimension.
In the case where the above-mentioned polishing is performed, not only hose forming steps become complicated, but also polishing powders remain at and around the polishing portion. Therefore, a cleaning step for removing the polishing powders is needed, and the hose forming steps become more and more complicated. As a result, the production cost of the hose is increased.
In order to the aforementioned problems, as illustrated in
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Chun Shackelford Heather
Melius Terry Lee
Tokai Rubber Industries Ltd.
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