US3764151A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Joint for cast concrete sections
Assignee: Condux International Inc
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Filing: 1972-05-08
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Granted: 1973-10-09
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Expires: 1992-05-08
Abstract
Abstract Multi-bore concrete sections of the bell and spigot type are formed integrally with preformed end liners or inserts. These are formed either by a vacuum process of by injection moulding and are placed at the spigot and bell ends of the sections. When the sections are laid in end-to-end relationship, an annular cavity is provided to receive a premoulded gasket or seal which can be compressed between the bell and spigot ends to form a tight seal against ingress of water to the bores of the connected sections. The liners form chamfers at the ends of the bores making it unnecessary to smooth the concrete thereat for the reception of sheathed cable strung through the connected bores. The liners are provided with structure for firmly anchoring the same to the concrete, and are rigid enough to resist deformation when the concrete is expressed from the mould in which it is formed.
Inventors
- 👤 C Elder
- 👤 L Jugle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 10:16
CPC Classifications
H; H02; H02G; H02G9/00; H02G9/06; F; F16; F16L; F16L39/00
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
254 words
An improved joint for concrete conduit sections of the type where each section has a bell end and a spigot end and wherein said spigot end of one section is received within the bell end of a contiguous section, each of said sections having a plurality of ducts therethrough from end to end, the ducts of one conduit section being in alignment with the ducts of the other conduit section when the sections are assembled in end-to-end relationship, the improvement which comprises: a. a first premoulded article cast with the bell end of each section, said article including i. a first body member including a planar section conforming in area to the cross-sectional area of said concrete section at the bell end thereof; ii. extensions from said first body member having inner surfaces thereon defining frusto-conical sections in said ducts at the ends thereof adjacent said bell end; b. a second premoulded article cast with the spigot end of each section, said article including i. a second body member including a planar section conforming in area to cross-sectional area of said concrete section at the spigot end thereof; ii. extensions from said second body member having inner surfaces defining frusto-conical sections in said ducts at the ends thereof adjacent said spigot end; c. sealing means disposed between said bell and spigot sections whereby said ducts are sealed against the ingress of water or the like and whereby a cable may be moved in a dUct through said first and second premould articles without interference.
Claim 2
Dependent Claim
254 words
An improved joint for concrete conduit sections of the type where each section has a bell end and a spigot end and wherein said spigot end of one section is received within the bell end of a contiguous section, each of said sections having a plurality of ducts therethrough from end to end, the ducts of one conduit section being in alignment with the ducts of the other conduit section when the sections are assembled in end-to-end relationship, the improvement which comprises: a. a first premoulded article cast with the bell end of each section, said article including i. a first body member including a planar section conforming in area to the cross-sectional area of said concrete section at the bell end thereof; ii. extensions from said first body member having inner surfaces thereon defining frusto-conical sections in said ducts at the ends thereof adjacent said bell end; b. a second premoulded article cast with the spigot end of each section, said article including i. a second body member including a planar section conforming in area to cross-sectional area of said concrete section at the spigot end thereof; ii. extensions from said second body member having inner surfaces defining frusto-conical sections in said ducts at the ends thereof adjacent said spigot end; c. sealing means disposed between said bell and spigot sections whereby said ducts are sealed against the ingress of water or the like and whereby a cable may be moved in a dUct through said first and second premould articles without interference.
Claim 3
Dependent Claim
44 words
An improved joint according to claim 1 wherein said second body member has a pair of spaced lands on the exterior surface for locating said sealing member and holding same in position when a pair of contiguous bell and spigot ends are brought ''''home.''''
Claim 4
Dependent Claim
31 words
An improved joint according to claim 2 wherein said sealing means has a base disposed between said spaced lands and sides extending normal thereto and in contact with said spaced lands.
Claim 5
Dependent Claim
35 words
An improved joint according to claim 3 wherein said sealing means has an oblique surface extending between said normal extending sides, said oblique surface being distorted when said bell and spigot ends are brought ''''home.''''
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) | 1976-10-08 | 1977-04-09 | 1977-10-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-08 | 1981-04-09 | 1981-10-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-08 | 1985-04-09 | 1985-10-09 | $7700.00 | Window Closed / Lapsed |