US3699766A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Drafting cot assembly
Assignee: Boeing North American Inc
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Filing: 1970-12-15
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Granted: 1972-10-24
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Expires: 1990-12-15
Abstract
Abstract An improved drafting cot assembly for use in conjunction with an open end electrostatic spinning apparatus. The assembly is comprised of a rotatably mounted cot roll having rotary, fiber advancing surface and smooth, rounded shields adjacent the ends of the roll to prevent stray fiber accumulation adjacent the fiber advancing surface.
Inventors
- 👤 Roger J Archambault
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 21:14
CPC Classifications
D; D01; D01H; D01H4/00; D01H4/28
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
120 words
An improved drafting front roll unit which includes a cot assembly and a fiber delivery roll for use with an open end spinning apparatus of the electrostatic type in which the cot assembly forms part of the electrode system creating the electrostatic field, said cot assembly comprising: a. a cot roll having a fiber advancing surface; b. electrically conductive means supporting said cot roll for rotation in operable contact with said fiber delivery roll; and c. electrically conductive generally dome shaped shield means adjacent said fiber advancing surface and mounted for rotation therewith, said shield means having a smooth surface off of which stray fibers will readily slip and acting to strengthen the electrostatic field adjacent said fiber advancing surface.
Claim 2
Dependent Claim
120 words
An improved drafting front roll unit which includes a cot assembly and a fiber delivery roll for use with an open end spinning apparatus of the electrostatic type in which the cot assembly forms part of the electrode system creating the electrostatic field, said cot assembly comprising: a. a cot roll having a fiber advancing surface; b. electrically conductive means supporting said cot roll for rotation in operable contact with said fiber delivery roll; and c. electrically conductive generally dome shaped shield means adjacent said fiber advancing surface and mounted for rotation therewith, said shield means having a smooth surface off of which stray fibers will readily slip and acting to strengthen the electrostatic field adjacent said fiber advancing surface.
Claim 3
Dependent Claim
17 words
An apparatus as defined in claim 1 wherein said shaped shield means has a generally hemispherical configuration.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-10-24 | 1976-04-24 | 1976-10-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-24 | 1980-04-24 | 1980-10-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-24 | 1984-04-24 | 1984-10-24 | $7700.00 | Window Closed / Lapsed |