Patent US4411409A successfully refreshed from Google Patents.
US4411409A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tube pulling and lubricating system
Assignee: MCALLISTER INDUSTRIES Ltd
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Filing: 1980-09-23
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Granted: 1983-10-25
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Expires: 2000-09-23
Abstract
Abstract Apparatus and a method is disclosed for inserting a plurality of PVC liner tubes in a concrete duct. The liner tubes subsequently receive fibre optic cables which can be inserted into each PVC duct at any time after they are installed. The invention provides a liner to encase and separate each fibre optic cable from one another inside the concrete duct. Apparatus is also disclosed for pulling power cable through such ductwork.
Inventors
- 👤 Jackson A. Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 16:45
CPC Classifications
H; H02; H02G; H02G1/00; H02G1/06; H02G1/08; H02G1/081; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49826; Y10T29/49838; Y10T29/53; Y10T29/53652; Y10T29/53696
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
112 words
Apparatus for drawing a plurality of empty conduits through a single larger tube comprising a single elongated pulling tube having an open end and a closed end with a pulling eye on the exterior of the closed end for connecting the pulling tube to a swivel lead; filler means located in the ends of the empty conduits and being of a length commensurate with that of the pulling tube; said conduits with said filler means being inserted into said pulling tube and a plurality of circumferential crimps spaced along the length of said pulling tube whereby drawing pull applied to said pulling eye is transmitted to the conduits with the filler means.
Claim 2
Dependent Claim
112 words
Apparatus for drawing a plurality of empty conduits through a single larger tube comprising a single elongated pulling tube having an open end and a closed end with a pulling eye on the exterior of the closed end for connecting the pulling tube to a swivel lead; filler means located in the ends of the empty conduits and being of a length commensurate with that of the pulling tube; said conduits with said filler means being inserted into said pulling tube and a plurality of circumferential crimps spaced along the length of said pulling tube whereby drawing pull applied to said pulling eye is transmitted to the conduits with the filler means.
Claim 3
Dependent Claim
13 words
Apparatus according to claim 1 wherein said filler means are pieces of dowel.
Claim 4
Dependent Claim
83 words
Apparatus for drawing a plurality of power cables through a single larger tube comprising a single pulling eye tube adapted for connection to a swivel lead, said power cables being grouped together and inserted in said single pulling eye tube; and a plurality of small diameter filler pieces combined in parallel with said power cables and located intermediate adjacent cables in the single pulling eye tube; and a plurality of spaced circumferential crimps applied throughout the length of said single pulling eye tube.
Claim 5
Dependent Claim
83 words
Apparatus for drawing a plurality of power cables through a single larger tube comprising a single pulling eye tube adapted for connection to a swivel lead, said power cables being grouped together and inserted in said single pulling eye tube; and a plurality of small diameter filler pieces combined in parallel with said power cables and located intermediate adjacent cables in the single pulling eye tube; and a plurality of spaced circumferential crimps applied throughout the length of said single pulling eye tube.
References Cited (Backward Citations)
CA1030060A
Cited
CA1040060A
Cited
US4028773A
Cited
US4078767A
Cited
US4170673A
Cited
US4101114A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-10-24 | 1987-04-25 | 1987-10-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-10-24 | 1991-04-25 | 1991-10-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-10-24 | 1995-04-25 | 1995-10-25 | $7700.00 | Window Closed / Lapsed |