US3596892A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Automatic gas cutting device
Assignee: Tanaka Manufacturing Co Ltd
•
Filing: 1969-12-09
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Granted: 1971-08-03
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Expires: 1989-12-09
Abstract
Abstract An automatic gas cutting device including means for detecting electromotive force produced across a preheating flame of the gas cutting device and means to control the running or the stopping of the device and to control the starting and stopping of the gas cutting automatically under an instruction of the detecting means. The detecting means based on a principle using a difference of the induced voltage across the flame of the gas cutting for each of the cutting conditions.
Inventors
- 👤 Minoru Nakanishi
- 👤 Hidehiko Hayasaki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 20:23
CPC Classifications
B; B23; B23K; B23K7/00; B23K7/10
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
95 words
An automatic cutting device comprising a detecting means for the induced voltage across a preheating flame of the gas cutting, and a controlling means which operates and releases under an instruction of the detecting means, said detecting means being arranged to respond to the voltage across the flame which is higher than a predetermined marginal voltage range so as to continue the operation and movement of the gas cutting device and to be insensitive to the voltage which is lower than the predetermined value so as to make the device to be a preparation stage.
Claim 2
Dependent Claim
95 words
An automatic cutting device comprising a detecting means for the induced voltage across a preheating flame of the gas cutting, and a controlling means which operates and releases under an instruction of the detecting means, said detecting means being arranged to respond to the voltage across the flame which is higher than a predetermined marginal voltage range so as to continue the operation and movement of the gas cutting device and to be insensitive to the voltage which is lower than the predetermined value so as to make the device to be a preparation stage.
Claim 3
Dependent Claim
40 words
An automatic gas cutting device according to claim 1, wherein the detecting means is constructed as a marginal relay means which operates by a voltage higher than a predetermined value and releases by a voltage lower than the predetermined value.
Claim 4
Dependent Claim
77 words
An automatic gas cutting device according to claim 1, wherein the range of the marginal voltage is choosen to be between a higher voltage range and a lower voltage range, of which the higher voltage range corresponding to situations of normal cutting operation such as, preheating stage, beginning stage and normal cutting stage, and the lower voltage range corresponding to situations such as before the preheating stage, test blowing stage and disabling stage of the cutting operation.
Claim 5
Dependent Claim
48 words
An automatic gas cutting device according to claim 1, wherein the running of the cutting device is stopped and the ejection of the cutting oxygen is temporarily stopped so as to restore the cutting operation when an emergency situation is detected during the progress of the cutting operation.
Claim 6
Dependent Claim
31 words
An automatic gas cutting device according to claim 1, wherein the higher voltage range lies in 1.2 to 1.8 volt and the lower voltage range lies in 0 to 0.5 volt.
Claim 7
Dependent Claim
25 words
An automatic gas cutting device according to claim 1, wherein the marginal voltage is selected to be in a range of 0.8 to 0.9 volt.
References Cited (Backward Citations)
US2949391A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-08-02 | 1975-02-01 | 1975-08-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-08-02 | 1979-02-01 | 1979-08-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-08-02 | 1983-02-01 | 1983-08-03 | $7700.00 | Window Closed / Lapsed |