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Patent US4524812A successfully refreshed from Google Patents.
US4524812A
Expired / Lapsed
US
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Modulated forming machine
Assignee: Individual
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Filing: 1982-09-29
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Granted: 1985-06-25
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Expires: 2002-09-29
Abstract
Abstract A material forming machine comprising a forming tool driven by a forming tool motor, a workpiece, a feed drive motor, a sensor, and a reference signal, wherein said sensor varies the speed of the feed drive motor by responding to variations of the speed of the forming tool's motion, and wherein the reference signal remains constant. Said machine performs sawing, shaping, milling, drilling, hammering, shearing, chiseling, and cutting on irregularly shaped workpieces, having variations in density.
Inventors
- 👤 Peter H. Murphy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 21:22
CPC Classifications
B; B23; B23Q; B23Q15/00; B23Q15/007; B23Q15/013; B23D; B23D45/00; B23D45/02; B23D45/021; B23D47/00; B23D47/08; B23D59/00; B23D59/001; B23Q1/00; B23Q1/25; B23Q1/44; B23Q1/50; B23Q1/54; B23Q1/5468; B23Q1/5481; B23Q11/00; B23Q11/08; B23Q5/00; B23Q5/22; B23Q5/34; B23Q5/38; B23Q5/385; Y; Y10; Y10T; Y10T409/00; Y10T409/30; Y10T409/304536; Y10T409/304648; Y10T409/304704; Y10T409/306664; Y10T83/00; Y10T83/141; Y10T83/768; Y10T83/7684; Y10T83/773
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
110 words
A material forming machine comprising a forming tool, driven by a forming tool motor, a workpiece, a feed drive motor, sensing means which generate a electrical signal which is proportional to the rotational speed of the forming tool motor, a constant reference signal greater than zero and equal in magnitude, but opposite in sign to the signal produced by the sensing means at the minimum desired rotational speed of the forming tool motor, and a summing amplifier to combine the signal from the sensing means with the reference signal to vary the speed of the feed drive motor in response to variations in the speed of the forming tool motor.
Claim 2
Dependent Claim
110 words
A material forming machine comprising a forming tool, driven by a forming tool motor, a workpiece, a feed drive motor, sensing means which generate a electrical signal which is proportional to the rotational speed of the forming tool motor, a constant reference signal greater than zero and equal in magnitude, but opposite in sign to the signal produced by the sensing means at the minimum desired rotational speed of the forming tool motor, and a summing amplifier to combine the signal from the sensing means with the reference signal to vary the speed of the feed drive motor in response to variations in the speed of the forming tool motor.
Claim 3
Dependent Claim
17 words
A material forming machine according to claim 1 wherein the sensing means is a direct current generator.
Claim 4
Dependent Claim
16 words
A material forming machine according to claim 1 wherein the sensing means is an optic encoder.
Claim 5
Dependent Claim
17 words
A material forming machine according to claim 1 wherein the sensing means is a hall effect encoder.
Claim 6
Dependent Claim
15 words
A material forming machine according to claim 1 wherein the summing amplifier is a diode.
Claim 7
Dependent Claim
16 words
A material forming machine according to claim 1 wherein the summing amplifier is a zener diode.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-06-24 | 1988-12-24 | 1989-06-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-06-24 | 1992-12-24 | 1993-06-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-06-24 | 1996-12-24 | 1997-06-25 | $7700.00 | Window Closed / Lapsed |