US3779078A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flame-proof fitting
Assignee: Hubbell Inc
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Filing: 1971-10-20
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Granted: 1973-12-18
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Expires: 1991-10-20
Abstract
Abstract A flame-proof fitting for conducting a capillary tube through the wall of a box including a bushing threaded through the wall, having a tapered passage through it, two semi-frusto-conical wedges having axial grooves to receive the tube when placed together, and a cap threadable onto the bushing to force the two members tightly into the tapered passage in the bushing, compressing them together tightly, and compressing them tightly against the tube.
Inventors
- 👤 G Kaesser
- 👤 M Zavertnik
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 13:44
CPC Classifications
G; G01; G01K; G01K1/00; G01K1/14; G01K5/00; G01K5/32; H; H02; H02G; H02G15/00; H02G15/013; Y; Y10; Y10T; Y10T403/00; Y10T403/70; Y10T403/7047; Y10T403/7051; Y10T403/7052; Y10T403/7056
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
217 words
In a flame-resistant fitting for conducting elongated elements through a wall, the combination of: means providing an elongated, smooth, tapered passage through the wall, the means having a projection extending free of the wall; a plurality of wedges of hard material having smooth interfaces so that the wedges constitute together a tapered solid that can fit into the tapered passage, each wedge having an axial groove, the grooves together providing an elongated opening to receive the elongated element, compressing means interengaging between the projection and the wedges to force the wedges tightly into the passage until their interfaces are in engagement, their grooves then forming an uninterrupted passage, the smooth interfaces of the wedges being of complementary shape, smooth, and interengageable closely enough and for a great enough extent under force of the compressing means to restrain flame passage between them and the grooves being shaped to complement the outside of the elongated element and of such shape that the wedges likewise cause the grooves to embrace the elongated element closely enough and over sufficient length to restrain passage of flame, the material of the wedges being hard so that the wedges are not permanently deformed under the force of the compressing means, and do not crush the elongated element, the wedges being also removable and replaceable.
Claim 2
Dependent Claim
217 words
In a flame-resistant fitting for conducting elongated elements through a wall, the combination of: means providing an elongated, smooth, tapered passage through the wall, the means having a projection extending free of the wall; a plurality of wedges of hard material having smooth interfaces so that the wedges constitute together a tapered solid that can fit into the tapered passage, each wedge having an axial groove, the grooves together providing an elongated opening to receive the elongated element, compressing means interengaging between the projection and the wedges to force the wedges tightly into the passage until their interfaces are in engagement, their grooves then forming an uninterrupted passage, the smooth interfaces of the wedges being of complementary shape, smooth, and interengageable closely enough and for a great enough extent under force of the compressing means to restrain flame passage between them and the grooves being shaped to complement the outside of the elongated element and of such shape that the wedges likewise cause the grooves to embrace the elongated element closely enough and over sufficient length to restrain passage of flame, the material of the wedges being hard so that the wedges are not permanently deformed under the force of the compressing means, and do not crush the elongated element, the wedges being also removable and replaceable.
Claim 3
Dependent Claim
22 words
In the fitting of claim 1: the means providing the tapered passage including a member threaded for removable engagement in the wall.
Claim 4
Dependent Claim
17 words
In the fitting of claim 1: the tapered passage and the tapered wedges being circular in cross-section.
Claim 5
Dependent Claim
42 words
In the fitting of claim 1: the tapered passage being frusto-conical, the wedges being two in number, each comprising a semi-frusto-conical member with a finished diametric flat surface in which the axial groove extends; and each having a smooth outer tapering surface.
Claim 6
Dependent Claim
44 words
In the fitting of claim 5: the compressing means comprising a nut threaded onto the projection and abutting the wedges, the nut having a central opening larger than the elongated element to enable an enlarged component on the element to be drawn through it.
Claim 7
Dependent Claim
123 words
In the fitting of claim 1 adapted for use with an elongated element comprising a capillary tube to which is secured an enlarged sensing element, the small end of the tapered passage being enlarged to be greater than the size of the sensing element, to enable the sensing element to be drawn through it when the wedges are removed, the elongated opening being of small cross section to receive and closely surround the capillary tube, the said opening being substantially smaller than the cross section of the tapered passage, leaving the interfaces of the wedges of substantial size, the said interfaces being smooth and complementary so that they can fit closely to prevent flame passage between them when they are wedged tightly together.
Claim 8
Dependent Claim
42 words
The fitting of claim 1, with a thermostat having a capillary tube constituting the elongated element, the capillary tube having an enlarged sensing device on it; the passage being large enough to pass the sensing element, the wedges engaging the capillary tube.
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) | 1976-12-17 | 1977-06-18 | 1977-12-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-17 | 1981-06-18 | 1981-12-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-17 | 1985-06-18 | 1985-12-18 | $7700.00 | Window Closed / Lapsed |