US3761601A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Removable flame-proof potted fitting
Assignee: Hubbell Inc
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Filing: 1971-10-04
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Granted: 1973-09-25
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Expires: 1991-10-04
Abstract
Abstract A removable flame-proof potted fitting consisting of a coupling assembly for carrying wires through the wall of a box, the assembly having an outer bushing externally threaded for a flameproof engagement into the wall of the box and having a smooth cylindrical inner surface, a cylindrical sleeve having a smooth outer surface removably slipped through the outer fitting with an engagement close and long enough to prevent passage of flame, removable retaining rings to hold the sleeve in the fitting, an elastomer gasket engageable into one end of the sleeve having openings to receive wires that extend through the sleeve, and potting compound filling the sleeve about the wires to prevent passage of flame, the sleeve with the wires being removable from the outer fitting without destroying that fitting or the potting of the wires, the bushing also being removable so that the entire device is removable easily as an entirety.
Inventors
- 👤 G Kaesser
- 👤 M Zavertnik
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 21:45
CPC Classifications
H; H01; H01H; H01H9/00; H01H9/02; H01H9/04; H01H9/041; H01B; H01B17/00; H01B17/26; H01B17/30; H01B17/303; H01B17/306
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
182 words
A fitting of the kind described to conduct elongated members through a wall without providing flame paths through the wall, comprising an outer bushing having means at one end for connecting it through a wall, and means at the other end for connecting it and securing it to a second receptacle, each of said means comprising an elongated interconnecting construction enabling a fit with said wall or receptacle which is close and long enough to retard flame passage; the bushing having a tubular smooth inner surface; a tubular sleeve to receive the elongated members and conduct them through the wall, the sleeve having an outer surface complementary to the inner surface of the bushing and being slideably engaged in the bushing, the outer dimensions of the sleeve being such that the sleeve can be inserted into either end of the bushing, the surfaces interfitting closely enough and with a length to retard flame; stop means limiting movement of the sleeve into the bushing, and removable means interengaging between the sleeve and bushing releasably to prevent removal of the sleeve from the bushing.
Claim 2
Dependent Claim
182 words
A fitting of the kind described to conduct elongated members through a wall without providing flame paths through the wall, comprising an outer bushing having means at one end for connecting it through a wall, and means at the other end for connecting it and securing it to a second receptacle, each of said means comprising an elongated interconnecting construction enabling a fit with said wall or receptacle which is close and long enough to retard flame passage; the bushing having a tubular smooth inner surface; a tubular sleeve to receive the elongated members and conduct them through the wall, the sleeve having an outer surface complementary to the inner surface of the bushing and being slideably engaged in the bushing, the outer dimensions of the sleeve being such that the sleeve can be inserted into either end of the bushing, the surfaces interfitting closely enough and with a length to retard flame; stop means limiting movement of the sleeve into the bushing, and removable means interengaging between the sleeve and bushing releasably to prevent removal of the sleeve from the bushing.
Claim 3
Dependent Claim
31 words
The fitting of claim 1, with a gasket of rubber-like material engaged into the end of the sleeve, the gasket having holes to receive the elongated members with a snug fit.
Claim 4
Dependent Claim
23 words
The fitting of claim 1, with elongated members extending through the sleeve, and potting compound in the sleeve sealing the elongated members therein.
Claim 5
Dependent Claim
27 words
The fitting of claim 1, wherein the interengaging surfaces of the bushing and sleeve are cylindrical to permit free angular orientation of the sleeve in the bushing.
Claim 6
Dependent Claim
35 words
The fitting of claim 1, wherein the sleeve projects beyond the bushing, and the removable means interengaging between them comprises a spring ring that can be snapped into place and removed therefrom by resilient distortion.
Claim 7
Dependent Claim
96 words
The fitting of claim 1, with a receptacle containing a control device having wires projecting therefrom to be extended outside the receptacle, the receptacle having a wall containing a threaded hole through it, the bushing being externally threaded into the hole to provide the flame-retarding engagement aforesaid; the wires extending through the bushing and the sleeve, and potting compound in the sleeve, surrounding the wires and sealing them to prevent flame passage through the sleeve, the sub-assembly of sleeve, wires and potting compound being installable into and removable from the bushing without disturbing the potting compound.
Claim 8
Dependent Claim
190 words
A fitting of the kind described to conduct elongated members through a wall without providing flame paths through the wall, comprising an outer bushing having means at one end for connecting it through a wall, said means enabling a fit with said wall which is close and long enough to retard flame passage; the bushing having a tubular smooth inner surface; a tubular sleeve to receive the elongated members and conduct them through the wall, the sleeve having an outer surface complementary to the inner surface of the bushing and being slideably engaged in the bushing, the maximum outer dimensions of the sleeve being no greater than the internal dimensions of the bushing, so that the sleeve can be inserted into either end of the bushing, the surfaces interfitting closely enough and with a length to retard flame; stop means limiting movement of the sleeve into the bushing, removable means interengaging between the sleeve and bushing releasably to prevent removal of the sleeve from the bushing, and the sleeve having means projecting inwardly from its inner surface to hold potting compound within the sleeve against axial loss from the sleeve.
Claim 9
Dependent Claim
190 words
A fitting of the kind described to conduct elongated members through a wall without providing flame paths through the wall, comprising an outer bushing having means at one end for connecting it through a wall, said means enabling a fit with said wall which is close and long enough to retard flame passage; the bushing having a tubular smooth inner surface; a tubular sleeve to receive the elongated members and conduct them through the wall, the sleeve having an outer surface complementary to the inner surface of the bushing and being slideably engaged in the bushing, the maximum outer dimensions of the sleeve being no greater than the internal dimensions of the bushing, so that the sleeve can be inserted into either end of the bushing, the surfaces interfitting closely enough and with a length to retard flame; stop means limiting movement of the sleeve into the bushing, removable means interengaging between the sleeve and bushing releasably to prevent removal of the sleeve from the bushing, and the sleeve having means projecting inwardly from its inner surface to hold potting compound within the sleeve against axial loss from the sleeve.
Claim 10
Dependent Claim
49 words
The fitting of claim 7, with a gasket of rubber-like material pressed into one end of the sleeve, the gasket having holes to receive the elongated members, the projecting means comprising a projection extending inwardly from the inner surface of the sleeve at the other end of the sleeve.
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) | 1976-09-24 | 1977-03-26 | 1977-09-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-24 | 1981-03-26 | 1981-09-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-24 | 1985-03-26 | 1985-09-25 | $7700.00 | Window Closed / Lapsed |