Patent US3649893A successfully refreshed from Google Patents.
US3649893A
Expired / Lapsed
US
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Synchronized driver for electrical utilization devices
Assignee: Allegheny Ludlum Corp
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Filing: 1970-08-11
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Granted: 1972-03-14
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Expires: 1990-08-11
Abstract
Abstract Apparatus for alternately energizing two electrical utilization devices such as linear motors, or two windings around a single linear motor armature, in such a manner so as to produce a reciprocating motion. One linear motor is energized for a given period of time, followed by a time elapse; whereupon the second linear motor is energized for the same time period and the cycle repeats. Synchronization of the two linear motors is achieved in one embodiment of the invention by counting or integrating the zero crossings of an applied alternating current waveform. Alternatively, a single linear motor can be energized for predetermined time intervals separated by fixed time periods, in which case the armature of the linear motor will ordinarily be returned to its starting position by a spring or the like.
Inventors
- 👤 Peter A Lajoie
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 11:14
CPC Classifications
H; H02; H02K; H02K33/00
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
124 words
In combination with a source of driving potential, a linear motor having a reciprocating element and winding means operatively associated with said reciprocating element, meaNs for producing an oscillatory voltage, a normally open switch device for connecting the winding means of said linear motor to said source of driving potential, means coupled to said oscillatory voltage producing means for generating an output pulse each time said oscillatory voltage passes through a predetermined number of full half cycles, the frequency of said output pulses being less than the frequency of said oscillatory voltage, and means for closing said switch device upon the occurrence of an output pulse from said means for producing pulses to energize said winding means and cause movement of said reciprocating element.
Claim 2
Dependent Claim
124 words
In combination with a source of driving potential, a linear motor having a reciprocating element and winding means operatively associated with said reciprocating element, meaNs for producing an oscillatory voltage, a normally open switch device for connecting the winding means of said linear motor to said source of driving potential, means coupled to said oscillatory voltage producing means for generating an output pulse each time said oscillatory voltage passes through a predetermined number of full half cycles, the frequency of said output pulses being less than the frequency of said oscillatory voltage, and means for closing said switch device upon the occurrence of an output pulse from said means for producing pulses to energize said winding means and cause movement of said reciprocating element.
Claim 3
Dependent Claim
42 words
The apparatus of claim 1 wherein said means for producing an oscillatory voltage comprises means for rectifying an applied alternating current source, said source of driving potential for the winding means of said linear motor comprising the output of said rectifying means.
Claim 4
Dependent Claim
24 words
The apparatus of claim 1 wherein said source of potential for the winding means of said linear motor comprises said alternating current voltage source.
Claim 5
Dependent Claim
117 words
The apparatus of claim 2 wherein said means for producing an output pulse each time said applied alternating current voltage source passes through a predetermined number of cycles is coupled to said rectifying means and comprises a transistor switch device, means for turning said transistor switch device ON each time the output waveform from said rectifying means intersects the zero axis of the waveform, capacitor means coupled to said transistor switch device whereby the capacitor means will charge to a predetermined voltage level after the transistor switch means conducts a predetermined number of times, and means including a breakdown circuit device for discharging said capacitor to produce an output pulse when said predetermined voltage level is reached.
Claim 6
Dependent Claim
40 words
The apparatus of claim 4 wherein said switch device comprises a thyristor and including a one-shot multivibrator coupled to the output of said means coupled to said rectifying means for producing firing pulses for the gate electrode of said thyristor.
Claim 7
Dependent Claim
116 words
The apparatus of claim 5 wherein there are two linear motors and two thyristors for alternately connecting said linear motors to said source of driving potential, and including a flip-flop circuit connected to the output of said one-shot multivibrator, a first gate circuit connected to one of the two output terminals of said flip-flop and said one-shot multivibrator for applying every other pulse from the one-shot multivibrator to the gate electrode of one of said thyristors, and a second gate circuit connected to the other of the two output terminals of said flip-flop and said one-shot multivibrator for applying the remaining pulses from said one-shot multivibrator to the gate electrode of the other of said thyristors.
Claim 8
Dependent Claim
14 words
The apparatus of claim 1 wherein said switch device comprises a semiconductive controlled rectifier.
Claim 9
Dependent Claim
33 words
The apparatus of claim 1 wherein there are two linear motors and two normally open switch devices for alternately connecting the winding means of said linear motors to said source of driving potential.
Claim 10
Dependent Claim
26 words
The apparatus of claim 1 wherein said linear motor comprises a solenoid including an armature, and a spring device for urging said armature in one direction.
Claim 11
Dependent Claim
38 words
The apparatus of claim 1 wherein said linear motor is provided with two oppositely-wound windings and there are two normally open switch devices for alternately connecting the respective ones of said windings to said source of driving potential.
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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) | 1975-03-14 | 1975-09-13 | 1976-03-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-03-14 | 1979-09-13 | 1980-03-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-03-14 | 1983-09-13 | 1984-03-14 | $7700.00 | Window Closed / Lapsed |