Pipes and tubular conduits – Flexible – Corrugated
Patent
1980-01-02
1984-12-25
Bryant, III, James E.
Pipes and tubular conduits
Flexible
Corrugated
138129, 138131, 138154, 138DIG8, F16L 1100
Patent
active
044897596
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
This invention relates to a flexible hose capable of keeping its length under conditions of expansion, contraction and variations therebetween, and of being kept as bent when the hose is bent.
DESCRIPTION OF THE PRIOR ART
Generally, this type of hose is called a folding hose. A single folding hose can have optional lengths and is able to be put away as contracted when out of use, thereby being useful as a suction hose for a cleaner or dust catcher. Such a hose is maintainable at bent angles optionally selected, thereby being useful as a blast hose for a hair dryer or usual drying machine.
Such a hose is also useful for the same purposes as a usual flexible hose, for example, as a dust-proof cover for an expansion joint of a machine tool hose, or as a bending drain hose used for a kitchen sink or wash stand.
Conventionally, three kinds of hoses have been disclosed as follows: Japanese patent publication No. Sho 43-23840 discloses a hose (a) which is smaller in thickness, does not provide any reinforcement, and is provided with folds extending at right angles to the direction of the length. One oblique side of each fold is made smaller than the other so that when the hose is put away the smaller oblique side is slanted elastically at the same angle of bend as the larger oblique side, thereby being kept in this condition. However, the hose (a), when its diameter is increased, becomes weak, and is unable to keep its form. Further, the elasticity of oblique side becomes poor.
Similarly to the above, Japanese patent publication No. Sho 45-14745 discloses a hose (b) whose oblique sides at each fold are made of equal length, in place of the unequal oblique sides of the hose (a). Also, one oblique side is made larger in thickness than the other so that when the hose is contracted the thin oblique side is positioned merely along the thick oblique side without having an elastic effect. The hose is thereby kept in this condition. The hose (b) however, is defective because it cannot be counted on to keep its form as its diameter becomes larger.
Both the hoses (a) and (b), which each have a wall of elastic material of synthetic resin, are not constant in length due to the condition of material.
Next, Japanese patent publication No. Sho 47-27164 discloses a hose (c) which has the ability to keep its formation. The hose is in the form of bellows type with a wall of synthetic resin, the wall being attached at the outer surface thereof with a reinforce coil, so that oblique sides of the bellows hose are curved. One of the curved oblique sides is made elastic to have the same effect as the aforesaid hose (a). In this case the hose is formed to curve at oblique sides after it is once molded so that there is a fear that the folding effect is lost once the hose is in use for a long time. Furthermore, there is a defect that warm air passing through the hose for a long time, removes the curved formation.
SUMMARY OF THE INVENTION
In view of the aforesaid problems, this invention has been designed. An object of the invention is the provision of a folding hose which eliminates the defects of conventional folding hoses, which has the ability to keep its formation regardless of its diameter, and which maintains the folding effect even when warm air flows through the hose.
Another object of the invention is to provide a folding hose of construction such that a molding process for making a conventional hose of bellows with a reinforce coil can be used without considerable change.
In order to achieve the aforesaid objects, the inventor has noticed that when expanding or contracting a bellows-type hose, the hose wall is bent at the shoulders on both sides of each chevron and at each valley apex, which concerns the stiffness of the hose wall. Hence, the modulus of elasticity in bending of synthetic resin constituting the hose wall of this invention is set in a range of 2.500 to 14.000 kg/cm.sup.2 and a coil is attached at each chevron of hose wall, with one shoulder being attached to the coil at a side near th
REFERENCES:
patent: 3157543 (1964-11-01), Roberts et al.
patent: 3323553 (1967-06-01), Richitelli et al.
patent: 3889716 (1975-06-01), Linhart
Bryant III James E.
Tigers Polymer Corporation
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