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US3724706A Expired / Lapsed US ⏱️ 0.0 years remaining

Explosion proof junction box

Assignee: Robroy Industries Inc
•
Filing: 1971-08-30
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Granted: 1973-04-03
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Expires: 1991-08-30
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Abstract

Abstract An explosion-proof and corrosion resistant junction box for electrical connection junctures and the like including a cap portion having a downwardly extending external screw portion, and a body portion having an internal screw portion. Both cap and body portions have a resilient, moisture resistant, polymeric coating bonded to the metal substrate. The cap and base portion coatings terminate in downward and upwardly extending relatively flexible flanges around their respective peripheries. The respective coated portions are adapted to threadably engage whereby the flange portions come into contact to provide an effective one-way vapor seal, and whereby the screw portions provide a path for gases from within to without the junction box. Hot gases under pressure within the junction box may pass along the path in said screw portions and through said one-way vapor seal, and, in so doing, become cooled to thereby prevent ignition or explosion of atmospheric gases near the junction box. The flange portions provide an effective moisture and vapor seal whereby corrosive vapors are prevented from corroding the outside surfaces or entering the junction box.

Inventors

  • 👤 F Slocum

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-30 16:12
CPC Classifications
H; H02; H02G; H02G3/00; H02G3/02; H02G3/08; H02G3/088; Y; Y10; Y10T; Y10T137/00; Y10T137/7722; Y10T137/7837; Y10T137/7879; Y10T137/788; Y10T137/7882; Y10T137/7884

Claims Analysis

Total Claims: 8
Claim 1
Independent Claim 121 words
An explosion-proof junction box for electrical connection junctures, or the like, including a cap portion and a body portion, said cap and body portions having a resilient, moisture resistant polymeric coating, said coating extending beyond the respective peripheries of said cap and said body portions whereby respective resilient flanges are formed thereon, said cap and body portions including threaded portions for threadably advancing said cap portion into said body portion whereby said resilient flange portions come into sealing contact to provide an effective one-way vapor seal for said junction box to prevent the flow of corrosive vapors into the threaded portions of said cap and body portions and permit the outflow of gas from said junction box through said threaded portions.
Claim 2
Dependent Claim 121 words
An explosion-proof junction box for electrical connection junctures, or the like, including a cap portion and a body portion, said cap and body portions having a resilient, moisture resistant polymeric coating, said coating extending beyond the respective peripheries of said cap and said body portions whereby respective resilient flanges are formed thereon, said cap and body portions including threaded portions for threadably advancing said cap portion into said body portion whereby said resilient flange portions come into sealing contact to provide an effective one-way vapor seal for said junction box to prevent the flow of corrosive vapors into the threaded portions of said cap and body portions and permit the outflow of gas from said junction box through said threaded portions.
Claim 3
Dependent Claim 38 words
The explosion-proof junction box as set forth in claim 1 wherein said respective resilient flange portions comprise a flange portion extending generally downwardly of said cap portion and a flange portion extending generally upwardly of said body portion.
Claim 4
Dependent Claim 19 words
The explosion-proof junction box as set forth in claim 2 wherein said polymeric coating comprises a polyvinylchloride film coating.
Claim 5
Dependent Claim 39 words
The explosion-proof junction box as set forth in claim 3 wherein said threaded portions comprise an external threaded portion extending downwardly of said cap portion and formed integrally thereof, and an internal threaded portion formed integrally of said portion.
Claim 6
Dependent Claim 27 words
The explosion-proof junction box as set forth in claim 4 wherein said external threaded portion and said internal threaded portion include respective helical threads having differing dimensions.
Claim 7
Dependent Claim 63 words
The explosion-proof junction box as set forth in claim 5 wherein said cap and body portions include respective cap flange and body flange portions, and wherein said cap flange and body flange portions may abut, each of said cap flange and body flange portions having a ground surface for providing a passageway through which gases may pass between said ground and abutting surfaces.
Claim 8
Dependent Claim 51 words
The explosion-proof junction box as set forth in claim 1 wherein said body portion includes one or more pipe coupling members extending therefrom for receiving a wire bearing conduit, and wherein said coating extends beyond each of said coupling members for providing a moisture resistant sleeve for sealably engaging said conduit.

References Cited (Backward Citations)

US3073888A Cited
US3141586A Cited
US3189210A Cited
US3343710A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1976-04-02 1976-10-02 1977-04-03 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1980-04-02 1980-10-02 1981-04-03 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1984-04-02 1984-10-02 1985-04-03 $7700.00 Window Closed / Lapsed

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