US4389440A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Torque preloaded elastic cover for torque coupling
Assignee: 3M Co
•
Filing: 1982-02-08
•
Granted: 1983-06-21
•
Expires: 2002-02-08
Abstract
Abstract An elastic cover for couplings or splices comprising a radially stretched and axially twisted elastic cover supported on a core of spirally wound polymeric material which is progressively removed from within the cover member as a continuous narrow strip.
Inventors
- 👤 Roger H. Keith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 21:28
CPC Classifications
H; H02; H02G; H02G15/00; H02G15/08; H02G15/18; H02G15/182; H02G15/1826; H02G15/1833; B; B29; B29C; B29C61/00; B29C61/06; B29C61/0608; B29C61/065; Y; Y10; Y10S; Y10S411/00; Y10S411/909; Y10T; Y10T29/00; Y10T29/49; Y10T29/49826; Y10T29/49863; Y10T29/4987; Y10T29/53; Y10T29/53657; Y10T428/00; Y10T428/13; Y10T428/1328; Y10T428/1352; Y10T428/1379; Y10T428/1386
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
79 words
An elastic cover assembly for couplings or splices completed by rotational movement between the members comprising an elastic tubular cover member having an axial twist formed between the ends of the member with said member supported in a radially stretched condition on a hollow core member comprising a tough flexible material formed as a substantially rigid tube which can be collapsed and removed, allowing the cover to relax tightly about a coupling or splice without loss of the twist.
Claim 2
Dependent Claim
79 words
An elastic cover assembly for couplings or splices completed by rotational movement between the members comprising an elastic tubular cover member having an axial twist formed between the ends of the member with said member supported in a radially stretched condition on a hollow core member comprising a tough flexible material formed as a substantially rigid tube which can be collapsed and removed, allowing the cover to relax tightly about a coupling or splice without loss of the twist.
Claim 3
Dependent Claim
34 words
An elastic cover assembly according to claim 1 wherein said cover member has an axial twist with the ends offset by 0.05 to 1 turn per diameter of the cover along the length thereof.
Claim 4
Dependent Claim
33 words
An elastic cover assembly according to claim 1 or 2 wherein said core member is a spirally wound ribbon to form a cylinder having an inside diameter between 0.46 inches and 5.0 inches.
Claim 5
Dependent Claim
25 words
An elastic cover assembly according to claim 1 wherein said core member is formed of a ribbon of cellulose acetate butyrate, polyvinyl chloride, or polypropylene.
Claim 6
Dependent Claim
19 words
An elastic cover assembly according to claim 1 wherein said cover member has at least one end folded inward.
Claim 7
Dependent Claim
20 words
An elastic cover according to claim 1 or 5 wherein the entire cover member is supported on said core member.
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) | 1986-06-20 | 1986-12-20 | 1987-06-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-06-20 | 1990-12-20 | 1991-06-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-06-20 | 1994-12-20 | 1995-06-21 | $7700.00 | Window Closed / Lapsed |