Plastic article or earthenware shaping or treating: apparatus – Distinct means to feed – support or manipulate preform stock... – Extrusion shaping means
Patent
1982-11-30
1984-09-18
Thurlow, Jeffery R.
Plastic article or earthenware shaping or treating: apparatus
Distinct means to feed, support or manipulate preform stock...
Extrusion shaping means
156149, 156393, 156431, 156432, 264103, 264173, 264174, 4251331, 425462, B29C 2726, B29D 2305
Patent
active
044721269
DESCRIPTION:
BRIEF SUMMARY
DESCRIPTION
TECHNICAL FIELD
This invention relates to an apparatus for manufacturing reinforced hoses, in which a torpedo is formed by being projected beyond the top end of an inner die of an inner tube extruder, an outer tube extruder has an outer tube material efflux port which is constituted by an intermediate die and an outer die and disposed close to the inner die and outside the torpedo, and means for forming a reinforced layer is arranged so as to lead the reinforcing thread out of a gap between the intermediate die and the inner die and throw onto an inner tube just extruded, and more particularly to an apparatus applied to manufacturing a reinforced hose with reinforced layer of spiral structure.
BACKGROUND ART
Such an apparatus for manufacturing reinforced hoses as above described was already filed for patent by the applicant of this invention and therefore known (refer to Japanese patent laid-open No. 51-79187). The apparatus for manufacturing reinforced hoses in known art is intended to manufacture a reinforced hose with a reinforcing layer of stranded structure, and the inventors tried to apply it for manufacturing a reinforced hose with a reinforcing layer of spiral structure. In this case, spiral structure means that seen in a reinforcing layer B as shown in FIG. 6 wherein inner reinforcing thread F1 and outer reinforcing thread F2 of plural numbers respectively are wound in spiral on an inner tube 6 in opposite directions with each other.
When the reinforcing layer of spiral structure is formed on the extruded inner tube, however, since the spiral device as a reinforcing layer forming device is usually rotated at such a high speed as 180.about.200 rpm (at a stranding machine, usually 30.about.55 rpm), overrunning of the reinforcing thread on account of the centrifugal force, interference of the top end of the inner die with the reinforcing thread, contacting between the inner and outer reinforcing threads, vibration transmitted from the extruder or the bobbin carrier to the thread and the like cause dispersion in the winding state of the reinforcing thread, thereby it is difficult to obtain uniform spiral structure stably, that is, to obtain a reinforced hose having stable quality (particularly being excellent in high-pressure resistance).
In view of above described aspects, an object of this invention is to provide an apparatus for manufacturing reinforced hoses, in which a reinforcing layer of uniform spiral structure can be formed stably.
DISCLOSURE OF INVENTION
This invention provides an apparatus for manufacturing reinforced hoses, which comprises a reinforcing layer forming device arranged in concentric with material efflux port of an outer tube extruder and an inner tube extruder, so that extruding of the inner tube, forming of the reinforcing layer and extruding of the outer tube can be performed continuously and approximately at the same time on a torpedo being projected beyond the top end of an inner die of the inner tube extruder, wherein the reinforcing layer forming device is constituted in a spiral device, and an outer spinner and an inner spinner, both formed in a truncated cone, are inserted at respective top ends with a plurality of thread holes through a gap between the outer tube extruding die and the inner tube extruding die and arranged rotatably in integral respectively with outer and inner bobbin carriers of the spiral device. In this constitution, the reinforcing layer of uniform spiral structure can be stably formed at manufacturing the reinforced hoses, a reinforced hose requiring strict quality (excellent high-pressure resistant property), such as water hose of small diameter for vehicles, can be manufactured continuously and at high speed.
BRIEF DESCRIPTION OF THE DRAWINGS
The drawings show preferable embodiments of this invention.
FIG. 1 is a plan view illustrating whole arrangement of an apparatus for manufacturing reinforced hoses;
FIG. 2 is a view illustrating arrangement of bobbin carrier of a spiral device;
FIG. 3 is a plan view in section of m
REFERENCES:
patent: 2563397 (1951-08-01), Colombo
patent: 2800683 (1957-07-01), Teichmann
patent: 3004286 (1961-10-01), Klein
patent: 3289251 (1966-12-01), Daubenfeld
patent: 3303251 (1967-02-01), Heider et al.
patent: 3375550 (1968-04-01), Klein
patent: 3405426 (1968-10-01), Donald
patent: 3961873 (1976-06-01), Brown
patent: 4202718 (1980-05-01), Mizutani et al.
Mitsui Kenichi
Murakawa Shoji
Thurlow Jeffery R.
Toyoda Gosei Co,., Ltd.
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