US4148236A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and a device for controlling thermal stresses in a power saw blade
Assignee: NORSK TRETEKNISK INSTITUTT
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Filing: 1977-12-21
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Granted: 1979-04-10
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Expires: 1997-12-21
Abstract
Abstract A method and a device for controlling thermal stresses in a power saw blade, especially a circular or band saw blade, during its use for any purpose, in order to assure the stability of the saw blade, by continuously measuring the temperature in two or more zones on the saw blade and determining the temperature difference between the zones; comparing the temperature difference(s) so calculated with one or more predetermined, desired temperature difference values; and using the result(s) of said comparison(s) to regulate the supply/removal of heat to/from one or more of said zones, in order thereby to maintain the/those desired temperature difference(s). The device comprising at least two temperature sensors a temperature comparator and one or more heat generators.
Inventors
- 👤 Sindre Holoyen
- 👤 Clayton D. Mote, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 02:24
CPC Classifications
B; B23; B23Q; B23Q11/00; B23Q11/14; B23Q11/143; B23D; B23D47/00; B23D47/005; B23D55/00; B23D55/005; B23D59/00; B23D59/001; Y; Y10; Y10T; Y10T83/00; Y10T83/04; Y10T83/141; Y10T83/148; Y10T83/283; Y10T83/293
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
99 words
A method for controlling thermal stresses in a power saw blade, especially a circular or band saw blade, during its use, in order to assure the stability of the saw blade, characterized by continuously measuring the temperature in at least two zones on the saw blade and determining the temperature difference between the zones; comparing the temperature difference(s) so calculated with predetermined, desired temperature difference values; and using the result(s) of said comparison(s) to regulate the transfer of heat to modify the temperature of at least one of said zones, in order thereby to maintain the desired temperature difference(s).
Claim 2
Independent Claim
99 words
A method for controlling thermal stresses in a power saw blade, especially a circular or band saw blade, during its use, in order to assure the stability of the saw blade, characterized by continuously measuring the temperature in at least two zones on the saw blade and determining the temperature difference between the zones; comparing the temperature difference(s) so calculated with predetermined, desired temperature difference values; and using the result(s) of said comparison(s) to regulate the transfer of heat to modify the temperature of at least one of said zones, in order thereby to maintain the desired temperature difference(s).
Claim 3
Independent Claim
100 words
A device for controlling thermal stresses in a power saw blade comprising a saw blade having teeth at an edge thereof, a temperature sensor disposed in a zone on the saw blade near the teeth of the blade and at least one other temperature sensor disposed in a zone or zones spaced from the teeth and said first zone; a comparator for comparing the measured temperature difference(s) with the predetermined, desired temperature difference(s); and one or more heat generators controlled by the result(s) of the comparison(s) from the comparator for controlled heat supply to one or more of the zones.
Claim 4
Independent Claim
100 words
A device for controlling thermal stresses in a power saw blade comprising a saw blade having teeth at an edge thereof, a temperature sensor disposed in a zone on the saw blade near the teeth of the blade and at least one other temperature sensor disposed in a zone or zones spaced from the teeth and said first zone; a comparator for comparing the measured temperature difference(s) with the predetermined, desired temperature difference(s); and one or more heat generators controlled by the result(s) of the comparison(s) from the comparator for controlled heat supply to one or more of the zones.
Claim 5
Dependent Claim
57 words
A device according to claim 2, characterized in that the temperature sensors and heat generators are placed on a line which corresponds to a standing diameter for the rotating circular saw blade, and in that the heat generators are placed on the other side of the hub of the circular saw blade relative to the temperature sensors.
Claim 6
Dependent Claim
21 words
A device according to claim 3, characterized in that said line is parallel with the direction of feed for the saw.
Claim 7
Dependent Claim
35 words
A device according to claim 2, characterized in that the temperature sensors are of a known type which measures infrared radiation, and in that the heat generator is a known per se induction heat generator.
Claim 8
Dependent Claim
77 words
A device according to claim 5, characterized by an IR-detector to which heat radiation from the two zones is reflected as pulses one at a time via a mirror for each zone to a prism placed between the two mirrors, and thence to the IR detector, a rotating, cup-shaped cover with a slot opening in one side being provided surrounding the prism, said cover alternately admitting and blocking heat radiation from one and then the other zone.
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) | 1982-04-09 | 1982-10-09 | 1983-04-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-04-09 | 1986-10-09 | 1987-04-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-04-09 | 1990-10-09 | 1991-04-10 | $7700.00 | Window Closed / Lapsed |