US4016484A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Solid state weld timer
Assignee: Individual
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Filing: 1975-06-18
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Granted: 1977-04-05
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Expires: 1995-06-18
Abstract
Abstract A solid state timer for controlling the duration of an A.C. excitation delivered to a load. A relay-tripped trigger pulse generator activates a rectangular waveform generator, whose adjustable duration output controls the gate of a silicon controlled rectifier. The rectifier controls a diode bridge circuit to switch a full wave excitation to the load for the duration of the rectangular waveform. The timer finds particular application in welding circuitry.
Inventors
- 👤 Reading H. Crouthamel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 04:40
CPC Classifications
B; B23; B23K; B23K11/00; B23K11/24; B23K11/25; B23K11/252; G; G05; G05F; G05F1/00; G05F1/10; G05F1/12; G05F1/40; G05F1/44
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
215 words
A power control circuit for supplying a fixed duration excitation across first and second output terminals from first and second input terminals supplied with a continuous A.C. signal comprising: conductor means for connecting said first output terminal and said first input terminal; means for generating a trigger pulse, said means-comprising: a single pole terminal switchable between first and second throw terminals; said pole terminal normally being connected to said first throw terminal; trip relay means for switching said pole between said first and second throw terminals; a capacitor connected to said pole terminal; a resistor connected between said first throw terminal and ground; a voltage bias source connected to said second throw terminal; and transistor circuit means having an output terminal and connected to said capacitor for generating an output pulse at said output terminal in response to connection of said capacitor to said bias source by said trip relay means; means for generating a rectangular waveform in response to generation of a said trigger pulse, said means including means for selectively setting the duration of said rectangular waveform; and switching means connected between said second input terminal and said second output terminal for producing a full wave A.C. excitation across said first and second output terminals for the duration of a said rectangular waveform.
Claim 2
Dependent Claim
215 words
A power control circuit for supplying a fixed duration excitation across first and second output terminals from first and second input terminals supplied with a continuous A.C. signal comprising: conductor means for connecting said first output terminal and said first input terminal; means for generating a trigger pulse, said means-comprising: a single pole terminal switchable between first and second throw terminals; said pole terminal normally being connected to said first throw terminal; trip relay means for switching said pole between said first and second throw terminals; a capacitor connected to said pole terminal; a resistor connected between said first throw terminal and ground; a voltage bias source connected to said second throw terminal; and transistor circuit means having an output terminal and connected to said capacitor for generating an output pulse at said output terminal in response to connection of said capacitor to said bias source by said trip relay means; means for generating a rectangular waveform in response to generation of a said trigger pulse, said means including means for selectively setting the duration of said rectangular waveform; and switching means connected between said second input terminal and said second output terminal for producing a full wave A.C. excitation across said first and second output terminals for the duration of a said rectangular waveform.
Claim 3
Dependent Claim
76 words
The power control circuit of claim 1 wherein said rectangular waveform generating means comprises monostable multivibrator means comprising: an intergrated circuit chip having a first input terminal connected to the output terminal of said transistor circuit means and second and third input terminals; and variable potentiometer means connected between said voltage bias source and said second input terminal; capacitor means; and means for connecting said capacitor means between said second input terminal and said third terminal.
Claim 4
Dependent Claim
65 words
The power control circuit of claim 2 wherein said switching means includes: a diode bridge having a first diode-diode junction connected to said second input and a second diode-diode junction connected to said second output terminal and third and fourth diode-diode junctions; and electronic switch means for connecting said third and fourth diode-diode junctions to a common point for the duration of said rectangular pulse.
Claim 5
Dependent Claim
23 words
The power control circuit of claim 3 wherein said voltage bias source comprises means for generating a bias voltage from said input signal.
Claim 6
Dependent Claim
29 words
The power control circuit of claim 4 further including clamping circuit means connected across said output terminals for protecting said diode bridge and electronic switch means from load transients.
Claim 7
Dependent Claim
160 words
A weld timer for supplying power to first and second terminals of a welding electrode transformer from an alternating line current supplied to first and second input terminals comprising: power supply means for developing a bias voltage; pulse generating means including a timing capacitor for producing a uniform trigger pulse upon connection of said capacitor to said bias voltage; trip relay means energized by said line current and actuable for connecting said capacitor to said bias voltage; means for generating a rectangular waveform of selected duration in response to production of a said trigger pulse; means for amplifying said rectangular waveform; a diode bridge having a first diode-diode junction connected to said second input terminal and a second diode-diode junction connected to said second welding transformer terminal; and thrid and fourth diode-diode junctions; and electronic switch means for connecting the third and fourth diode-diode junctions of said bridge to a common point for the duration of said amplified rectangular waveform.
Claim 8
Dependent Claim
160 words
A weld timer for supplying power to first and second terminals of a welding electrode transformer from an alternating line current supplied to first and second input terminals comprising: power supply means for developing a bias voltage; pulse generating means including a timing capacitor for producing a uniform trigger pulse upon connection of said capacitor to said bias voltage; trip relay means energized by said line current and actuable for connecting said capacitor to said bias voltage; means for generating a rectangular waveform of selected duration in response to production of a said trigger pulse; means for amplifying said rectangular waveform; a diode bridge having a first diode-diode junction connected to said second input terminal and a second diode-diode junction connected to said second welding transformer terminal; and thrid and fourth diode-diode junctions; and electronic switch means for connecting the third and fourth diode-diode junctions of said bridge to a common point for the duration of said amplified rectangular waveform.
Claim 9
Dependent Claim
169 words
A power control circuit for supplying a fixed duration excitation across first and second output terminals from first and second input terminals supplied with a continuous A.C. signal comprising: conductor means for connecting said first output terminal and said first input terminal; switch means switchable between a first switch terminal and a second switch terminal, said switch means cooperable with said first and second input terminals for maintaining said switch means at its first switch terminal by the continuous A.C. signal applied across said first and second terminals; trip means activatable for switching said switch means to its second switch terminal; means for generating a trigger pulse responsive to said switch means switched to its second switch terminal; means for generating a rectangular waveform in response to generation of a said trigger pulse; and switching means connected between said second input terminal and said second output terminal for producing a full wave A.C. excitation across said first and second output terminals for the duration of a said rectangular waveform.
Claim 10
Dependent Claim
169 words
A power control circuit for supplying a fixed duration excitation across first and second output terminals from first and second input terminals supplied with a continuous A.C. signal comprising: conductor means for connecting said first output terminal and said first input terminal; switch means switchable between a first switch terminal and a second switch terminal, said switch means cooperable with said first and second input terminals for maintaining said switch means at its first switch terminal by the continuous A.C. signal applied across said first and second terminals; trip means activatable for switching said switch means to its second switch terminal; means for generating a trigger pulse responsive to said switch means switched to its second switch terminal; means for generating a rectangular waveform in response to generation of a said trigger pulse; and switching means connected between said second input terminal and said second output terminal for producing a full wave A.C. excitation across said first and second output terminals for the duration of a said rectangular waveform.
Claim 11
Dependent Claim
104 words
A power control circuit according to claim 7 and further including: capacitor means; voltage source means connectable to said capacitor means for charging thereof responsive to said switch means switched to said second switch terminal; voltage drain means connectable to said capacitor means for discharging thereof responsive to said switch means switched to said first switch terminal; and wherein said trigger pulse generating means includes: transistor circuit means having an output terminal and connected to said capacitor means for generating an output pulse at said output terminal in response to connection of said capacitor means to said voltage source by said trip relay means.
Claim 12
Dependent Claim
33 words
A power control circuit according to claim 8 wherein said rectangular waveform generating means comprises monostable multivibrator means including settable resistor and capacitor means for selectively setting the duration of said rectangular waveform.
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) | 1980-04-04 | 1980-10-04 | 1981-04-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-04-04 | 1984-10-04 | 1985-04-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-04-04 | 1988-10-04 | 1989-04-05 | $7700.00 | Window Closed / Lapsed |