US3726392A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flexible device for conveying powdery granular fibrous or fluid products
Assignee: Individual
•
Filing: 1971-01-11
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Granted: 1973-04-10
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Expires: 1991-01-11
Abstract
Abstract This invention relates to a flexible device for conveying powdery, granular, fibrous or fluid products, composed of an outer flexible tube having an opening near each of its ends and of a plurality of conveying spirals constituted by helical springs having the same direction of winding, disposed coaxially inside said sleeve and rotated, in the same direction, at speeds which are substantially reverse of their respective pitches.
Inventors
- 👤 B Rastoin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 21:59
CPC Classifications
B; B65; B65G; B65G33/00; B65G2812/00; B65G2812/05; B65G2812/0505; B65G2812/0511; B65G2812/0516; B65G2812/0522
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
174 words
In a conveying device for pulverulent, granular, fibrous or fluid substances having an outer flexible tube with two ends; first means defining an inlet opening in said tube adjacent one end thereof; second means defining an outlet opening in said tube adjacent the other end thereof; spiral means rotated inside said tube for feeding said substance through said tube from said inlet opening to said outlet opening and a flexible core disposed axially inside said spiral means, said conveying device further characterized in that said spiral means comprises two identical, interlaced, coaxial helical wires wound in the same direction around the flexible core and arranged to bE rotated simultaneously at equal speeds by a single shaft, said core and said helical wires having a cross section which substantially occupies the whole of the interior of said outer flexible tube with the flexing of the flexible core and the surrounding tube maintaining the helical wires in proper relation for transporting substances and said helical wires further being free of any driving relation with the core.
Claim 2
Dependent Claim
174 words
In a conveying device for pulverulent, granular, fibrous or fluid substances having an outer flexible tube with two ends; first means defining an inlet opening in said tube adjacent one end thereof; second means defining an outlet opening in said tube adjacent the other end thereof; spiral means rotated inside said tube for feeding said substance through said tube from said inlet opening to said outlet opening and a flexible core disposed axially inside said spiral means, said conveying device further characterized in that said spiral means comprises two identical, interlaced, coaxial helical wires wound in the same direction around the flexible core and arranged to bE rotated simultaneously at equal speeds by a single shaft, said core and said helical wires having a cross section which substantially occupies the whole of the interior of said outer flexible tube with the flexing of the flexible core and the surrounding tube maintaining the helical wires in proper relation for transporting substances and said helical wires further being free of any driving relation with the core.
References Cited (Backward Citations)
GB855270A
Cited
US3381801A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-04-09 | 1976-10-09 | 1977-04-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-09 | 1980-10-09 | 1981-04-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-09 | 1984-10-09 | 1985-04-10 | $7700.00 | Window Closed / Lapsed |