US3769097A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of removing smoke and fumes produced by flame cutting of metal plates received on a burning table
Assignee: Lukens Inc
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Filing: 1972-06-08
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Granted: 1973-10-30
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Expires: 1992-06-08
Abstract
Abstract The combination of a table for cutting steel plate and an exhaust system for evacuating the fumes and smoke produced by the cutting operation. The expendable grating of the cutting table utilizes bars which are diagonal to the usual cutting directions and are connected by staggered stiffening bars also diagonally located so that the bars are not normally cut along their longitudinal axis. Duct work under the grating comprises heavy vertically extending removable plates resting on edge which additionally provide support for the grating and lead to an elongated exhaust manifold channel having a plurality of openings and a normally closed plate covering each of such openings. The openings are disposed in a horizontal dividing plate and communicate with the space formed between each of the vertically extending plates making up the ductwork under the grating. The cover plates are hinged and raised from a horizontal position by a pneumatic cylinder actuated through a photoelectric cell which is responsive to light from plasma of the cutting torch. The photoelectric cell further actuates adjacent cover plates on either side of the cover plate which corresponds to the duct with which the photoelectric cell involved is aligned. Each hinged cover plate has a deep lip soft sealed ring which seats on the peripheral surface of the dividing plate about the corresponding opening and the arrangement is such that the fumes must make a 90* turn prior to entering the opening which slings out heavy particles which then drop to the bottom of the exhaust chamber for easy removal.
Inventors
- 👤 J Walters
- 👤 Gibbon V Mc
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 01:00
CPC Classifications
B; B08; B08B; B08B15/00; B23; B23K; B23K7/00; B23K7/002; B23Q; B23Q11/00; B23Q11/0042; B23Q11/0046; B08B2215/00; B08B2215/006
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
22 words
A method in accordance with claim 1 wherein the exhausting of said channel is actuated by the receipt of said flame therein.
Claim 2
Independent Claim
105 words
A method of removing smoke and fumes generated by a cutting torch cutting a large metal plate supported in a horizontal position on a burning table which comprises the steps of: moving the cutting torch along the upper surface of the plate with the flame cutting said plate extending downwardly to below said plate; continually defining duct means under said plate which is receiving said flame, smoke and fumes generated by the cutting torch; continually sensing said flame extending below said plate; and continually exhausting smoke and fumes generated by said cutting torch through said duct means in response to the sensing of said flame.
Claim 3
Independent Claim
134 words
A method of effectively removing smoke and fumes generated by a cutting torch cutting a large metal plate supported in a horizontal position on a burning table which includes a plurality of channels underlying said plate, which comprises the steps of: moving the cutting torch along the upper surface of the plate with the flame cutting said plate extending downwardly into at least one of said channels; continually sensing in each of said channels for the receipt of said flame by means of separately monitoring each of said channels by a separate sensor means; and removing smoke and fumes generated by said torch through the channel receiving said flame by actuating exhaust means having a flow communication therewith via the channel wherein said flame extends in response to the sensing of said flame thereIn.
Claim 4
Dependent Claim
24 words
A method in accordance with claim 4 wherein said sensor means causes the exhausting of each said channel adjacent the channel receiving said flame.
Claim 5
Dependent Claim
81 words
A method in accordance with claim 4 wherein each said channel connects with a manifold which in turn connects to said exhaust means, there being a plurality of valve means in said manifold, a separate of said valve means for interrupting flow communication between each said channel and said exhaust means, each said valve means being normally closed, the sensing of flame in the channel receiving same causing the valve means interrupting flow communication therein to said exhaust means to open.
Claim 6
Dependent Claim
34 words
A method in accordance with claim 6 wherein the sensing of flame in the channel receiving said flame causes the opening of valve means for each said channel adjacent the channel receiving said flame.
Claim 7
Independent Claim
91 words
A method of removing smoke and fumes generated by a plasma cutting a material carried on a supporting means wherein a plurality of channels underlie said material, which comprises the steps of: moving said plasma along said material, said plasma being caused to extend through said material sufficiently to generate electromagnetic radiations into the underlying channel; separately sensing each of said channels for receipt of said electromagnetic radiations; and selectively exhausting the channel in which said radiations are sensed whereby smoke and fumes generated therein by the plasma cutting are removed.
Claim 8
Dependent Claim
28 words
A method in accordance with claim 8 wherein said sensing of said radiations in a said channel actuates the exhausting of such channel and each channel adjacent thereto.
Claim 9
Dependent Claim
95 words
A method in accordance with claim 8 wherein each said channel separately connects with manifold means having a flow communication to the intake of means for exhausting, a plurality of valve means in said manifold means, a separate valve means for interrupting flow communication between the corresponding of said channels and said means for exhausting, each said valve means being normally closed, the sensing of said radiations in the channel receiving same causing the corresponding valve means to open whereby flow communication is established between said channel receiving said radiations and said means for exhausting.
Claim 10
Dependent Claim
42 words
A method in accordance with claim 10 wherein said sensing of said radiations in a said channel activates the valve means corresponding to each channel adjacent to said channel wherein the valve means corresponding to said adjacent channels are caused to open.
Claim 11
Independent Claim
126 words
A method of effectively removing smoke and fumes generated by a torch cutting a large metal plate supported in a horizontal position on a burning table which includes a plurality of channels underlying said plate, the method comprising the steps of: moving the cutting torch along the upper surface of the plate with the flame cutting said plate extending through the plate to the upper aspect of at least one of said channels; continually sensing the position of said flame relative to said channels; and removing smoke and fumes generated by the cutting operation by actuating exhaust means having a flow communication with the channel under said flame in response to sensing the position of said flame, whereby said channel is exhausted by said exhaust means.
Claim 12
Dependent Claim
40 words
A method in accordance with claim 12 wherein exhaust means is provided for each channel adjacent to the channel under said flame, said each channel also being exhausted by exhaust means in response to sensing the position of said flame.
Claim 13
Dependent Claim
65 words
A method in accordance with claim 12 wherein each said channel is received by a manifold which connects to said exhaust means, said manifold having a separate valve means interrupting between each said channel and said exhaust means, each said valve means being normally closed, the sensing of said position of said flame causing the valve means for the channel underlying said flame to open.
Claim 14
Dependent Claim
30 words
A method in accordance with claim 14 wherein the valve means for channels adjacent to the channel underlying said flame are also caused to open by said flame position sensing.
Claim 15
Independent Claim
106 words
A method of effectively removing smoke and fumes generated by plasma cutting of a horizontally disposed steel plate carried on a supporting means wherein a plurality of channels underlie said steel plate, the method comprising the steps of: moving said plasma along the upper surface of the steel plate so as to cut downwardly through said plate; continually determining the position of said plasma relative to said channels; and removing smoke and fumes generated by the plasma cutting operation by actuating exhaust means having a flow communication with the channel which is determined to be under the portion of said plate being cut by said plasma.
Claim 16
Dependent Claim
28 words
A method in accordance with claim 16 wherein the determination of the position of said plasma relative to said channels is accomplished by sensing radiations from said plasma.
Claim 17
Dependent Claim
61 words
A method in accordance with claim 17 wherein a photoelectric cell in each channel is adapted to sense said radiations therein from said plasma, said photoelectric cell actuating exhaust means having a flow communication with the channel under the portion of said plate being cut by said plasma whereby it is exhausted of fumes and smoke produced by the cutting operation.
Claim 18
Dependent Claim
46 words
A method in accordance with claim 18 wherein said photoelectric cell sensing radiations in its corresponding channel actuates exhaust means for channels adjacent thereto which are also exhausted of any smoke and fumes which may be received therein due to the proximity of the cutting operation.
Claim 19
Dependent Claim
51 words
A method in accordance with claim 19 wherein said channels connect into a manifold through valve means corresponding to each channel and said manifold connects to said exhaust means, the actuating of said exhaust means for a selected channel comprising the opening of said valve means corresponding to the selected channel.
References Cited (Backward Citations)
US3627591A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-10-29 | 1977-04-30 | 1977-10-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-29 | 1981-04-30 | 1981-10-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-29 | 1985-04-30 | 1985-10-30 | $7700.00 | Window Closed / Lapsed |