US3564103A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Shutoff device for hollow electrodes
Assignee: Knapsack AG
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Filing: 1969-08-26
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Granted: 1971-02-16
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Expires: 1989-08-26
Abstract
Abstract Shutoff device for hollow electrodes supplying particulate feed material to and/or removing furnace gas from electrothermal reduction furnaces, arc melting furnaces, e.g., calcium carbide or similar furnaces. The inner shell of the hollow electrode has an inclined pipe socket secured to it, preferably welded thereto, which in turn has detachably secured to it a sleeve with an inflatable bag therein. The bag is displaceable by means of a thrust rod from inside the sleeve to a position inside the hollow electrode, and inflated therein using gas under pressure to effect shutoff of the hollow electrode.
Inventors
- 👤 Albert Brachschob
- 👤 Heinrich Weiler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:39
CPC Classifications
H; H05; H05B; H05B7/00; H05B7/02; H05B7/06; H05B7/08; H05B7/085; C; C01; C01B; C01B32/00; C01B32/90; C01B32/914; C01B32/942
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
92 words
A shutoff device for the inner shell of a hollow electrode supplying particulate feed material to and/or removing furnace gas from electrothermal reduction furnaces and arc melting furnaces, said shutoff device comprising an inclined pipe socket secured to said inner shell, a sleeve detachably secured to said pipe socket and having an inflatable bag therein, a thrust rod to position said inflatable bag from inside said sleeve to inside said inner shell, and means to inflate said bag with pressure gas inside said inner shell to effect shutoff of said inner shell.
Claim 2
Dependent Claim
92 words
A shutoff device for the inner shell of a hollow electrode supplying particulate feed material to and/or removing furnace gas from electrothermal reduction furnaces and arc melting furnaces, said shutoff device comprising an inclined pipe socket secured to said inner shell, a sleeve detachably secured to said pipe socket and having an inflatable bag therein, a thrust rod to position said inflatable bag from inside said sleeve to inside said inner shell, and means to inflate said bag with pressure gas inside said inner shell to effect shutoff of said inner shell.
Claim 3
Dependent Claim
23 words
The shutoff device as claimed in claim 11, wherein the inclined pipe socket is welded to the inner shell of the hollow electrode.
Claim 4
Dependent Claim
18 words
The shutoff device as claimed in claim 11, wherein the inflatable bag is made up of extensible material.
Claim 5
Dependent Claim
16 words
The shutoff device as claimed in claim 3, wherein the inflatable bag is a rubber bag.
Claim 6
Dependent Claim
46 words
The shutoff device as claimed in claim 1, wherein said inclined pipe socket has an external thread secured to its free end, and the front end of the sleeve carries a nut union to detachably secure said sleeve to said thread on said inclined pipe socket.
Claim 7
Dependent Claim
39 words
The shutoff device as claimed in claim 11, wherein the sleeve is designed to have a radius of curvature such that the assumed extension of its center axis is substantially tangential to the center axis of the hollow electrode.
Claim 8
Dependent Claim
43 words
The shutoff device as claimed in claim 11, wherein the inflatable bag is secured to and envelops the lower end of the thrust rod which is a beNt pipe whose center axis is arranged so as to coincide with that of the sleeve.
Claim 9
Dependent Claim
50 words
The shutoff device as claimed in claim 11, wherein the inclined pipe socket has disposed in it a sleeve with a conical inside, receiving a stopper which has a cap nut secured to it and can be maintained in position by means of a screw bearing against a sleeve-supported disc.
Claim 10
Dependent Claim
24 words
The shutoff device as claimed in claim 11, wherein the stopper is an elastically deformable stopper and the cap nut is vulcanized into it.
Claim 11
Dependent Claim
23 words
The shutoff device as claimed in claim 9, wherein the stopper is a rubber stopper and the cap nut is vulcanized into it.
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) | 1974-02-15 | 1974-08-17 | 1975-02-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-15 | 1978-08-17 | 1979-02-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-15 | 1982-08-17 | 1983-02-16 | $7700.00 | Window Closed / Lapsed |