Patent US3574996A successfully refreshed from Google Patents.
US3574996A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tubular sheathed chain
Assignee: Individual
•
Filing: 1969-01-17
•
Granted: 1971-04-13
•
Expires: 1989-01-17
Abstract
Abstract A tubular sheathed chain having an undulate sheath conforming to links of the chain and continuously urging it toward a fully extended condition, while maintaining its flexibility which if formed by extruding a tubular plastic sheath about a link chain being fed along a path and continuously collapsing the sheath at a predetermined point in the path downstream of a sheath forming station such that the sheath is collapsed into contact about the chain while in a relaxed plastic condition.
Inventors
- 👤 August W Loos
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 10:48
CPC Classifications
B; B29; B29C; B29C48/00; B29C48/15; B29C48/154; B29C48/03; B29C48/09; B29C48/12; B29C48/13
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
102 words
A tubular sheathed chain comprising a link chain and a plastic sheath extruded thereabout and drawn down into intimate surface contact while in a partially solidified, relaxed state to provide an outer sheath of undulate conforming profile with voids internally of the sheathed chain, the sheath having a residual longitudinal tension throughout the chain links in a stress pattern which connects points on the links of maximum lateral dimension, the sheath resiliently biasing adjacent links away from one another for maintaining the sheathed chain in an extended condition while ensuring its flexibility by preserving voids within the links of the sheathed chain.
Claim 2
Dependent Claim
102 words
A tubular sheathed chain comprising a link chain and a plastic sheath extruded thereabout and drawn down into intimate surface contact while in a partially solidified, relaxed state to provide an outer sheath of undulate conforming profile with voids internally of the sheathed chain, the sheath having a residual longitudinal tension throughout the chain links in a stress pattern which connects points on the links of maximum lateral dimension, the sheath resiliently biasing adjacent links away from one another for maintaining the sheathed chain in an extended condition while ensuring its flexibility by preserving voids within the links of the sheathed chain.
Claim 3
Dependent Claim
46 words
The tubular sheathed chain of claim 1 wherein the sheath intimately grips the chain with a residual hoop tension to resist longitudinal displacement therefrom, the hoop tension being of a maximum intensity adjacent the ends of the links at said points thereon of maximum lateral dimension.
References Cited (Backward Citations)
US1105925A
Cited
US2020943A
Cited
US2110226A
Cited
US2708771A
Cited
US2956305A
Cited
US2956311A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-04-12 | 1974-10-12 | 1975-04-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-04-12 | 1978-10-12 | 1979-04-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-04-12 | 1982-10-12 | 1983-04-13 | $7700.00 | Window Closed / Lapsed |