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US2867798A - Generators for producing pulses of alternating current - Google Patents

Generators for producing pulses of alternating current Download PDF

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Publication number
US2867798A
US2867798A US503505A US50350555A US2867798A US 2867798 A US2867798 A US 2867798A US 503505 A US503505 A US 503505A US 50350555 A US50350555 A US 50350555A US 2867798 A US2867798 A US 2867798A
Authority
US
United States
Prior art keywords
blade
lever
generators
current
alternating current
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US503505A
Other languages
English (en)
Inventor
Jules Coquelet
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Umicore NV SA
Original Assignee
ACEC SA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by ACEC SA filed Critical ACEC SA
Application granted granted Critical
Publication of US2867798A publication Critical patent/US2867798A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K35/00—Generators with reciprocating, oscillating or vibrating coil system, magnet, armature or other part of the magnetic circuit
    • H02K35/06—Generators with reciprocating, oscillating or vibrating coil system, magnet, armature or other part of the magnetic circuit with moving flux distributors, and both coil systems and magnets stationary
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes

Definitions

  • This invention relates to generators for producing short pulses of alternating current, and particularly to generators of the type in which the current is generated in a coil associated with a vibrating blade in a magnetic circuit.
  • the vibrating blade may be fixed at one end to the magnetic circuit with the other end of the blade left free to vibrate in a gap of the magnetic circuit.
  • the blade preferably is held in a deflected position and then suddenly released to vibrate freely and thus produce a pulse of alternating current. If the blade is released by a pawl operated by levers or other means in such a way that the blade begins to move at the same time as the lever or other operating means, then certain drawbacks occur. Particularly, the release of the blade is not sufliciently abrupt and uniform. This results in non-uniform pulses having considerable variations in shape and duration. In order to obviate this drawback it is important to release the blade sharply and precisely every time, and this is one of the objects of the invention.
  • the foregoing object is attained according to one exemplary embodiment of the invention by maintaining the blade in a deflected condition under the action of a springbiased lever, and then releasing the blade by a sharp impact on the lever by a plunger core of an electromagnet, which core strikes the lever only at the end of its stroke.
  • Another object of the invention is to make possible a precise control of the amplitude of the pulse. This object is accomplished by providing the electromagnet with an abutment screw against which the lever rests. Adjustment of the screw continuously varies the initial deflection of the blade and hence the amplitude of the generated current.
  • a further object of the invention is to generate pulses of which the first oscillation is of maximum amplitude so that the rise time or build-up time of the pulse is a minimum. This object is attained by bending the blade in its resting position so that the blade vibrates initially with its maximum amplitude.
  • a still further object of the invention is to reduce or substantially prevent the production of transients or other irregularities of the current from the current generator. Such irregularities appear to be produced by vibrations resulting from the impact of the plunger on the lever. It has been found that these irregularities can be substantially prevented without appreciably reducing the sharpness of the impact on the lever by providing suitable damping means between the lever and the plunger.
  • a vibrating blade A is fixed at its lower end to an anchoring piece of soft iron A and is free to vibrate at its upper end.
  • the blade is formed of a resilient magnetic material.
  • the vibrating portion of blade A is positioned in the gap M1 of a magnetic circuit M2 of a magnet M, which may be a permanent magnet.
  • a current generating coil B is associated with the blade A so that the flux through coil B varies with the position of blade A in the gap M1. At rest, the blade A is held bent by the action of a spring R on a lever L.
  • the lever L has a fixed fulcrum O and is shaped so that it is necessary only to pivot the lever L against the pull of spring R to release the vibrating blade A.
  • This action is produced by an electromagnet I having a plunger core P.
  • the core P has a cap or flange P1 and an offset A compressible hammer U rests freely on the top of plunger P.
  • the electromagnet I When the electromagnet I is energized, the core P is drawn upward into the coil I1 and strikes the lever L near the end of its stroke. At the moment of impact the plunger P has all the kinetic energy it has stored up during its stroke, and in addition the attracting force of the electromagnet is then at a maximum value. The impact of the plunger on the lever L makes it pivot and thereby permits a quick and sharp release of blade A.
  • This member may be formed of polycaprolactame or any suitable plastic or compressible member may be used which is capable of damping out the parasitic vibrations which give rise to the undesirable irregularities of the output current from coil B.
  • short current pulses having twelve different frequencies are transmitted to represent a five unit code.
  • These current pulses can be supplied by a like number of generators of the type herein described, arranged so that the vibrating blades vibrate at the different desired frequencies of the currents.
  • a control current is impressed by one of the control circuits G1G12 on the coil of the electromagnet for that frequency. This causes the plunger P of that electromagnet, the lever L, and the blade A to operate, and thereby produce a current in coil B of the required frequency.
  • means including a pivoted lever for adjustably and releasably holding said blade in a predetermined bent position which is determinative of the maximum amplitude of the vibrations of said blade when released, means. constantly biasing the lever toward av position for bending the blade, an electromagnet having a movable plunger core which is imparted movement when the electromagnet is energized for delivering an impact to the lever at the end of its movement and for moving said lever away from said blade in a general direction toward which the blade tends to move initially when released from its bent position, and means including a coil surrounding said blade for producing a current corresponding to the vibrations of said blade.
  • a current generator according to claim 1 including resilient means for preventing said impact from producing spurious frequencies in said current.
  • a plurality of current generators each generator comprising a magnetic circuit, for each generator a blade of resilient magnetic material fixedly connected at one end and having its other end free to vibrate near poles of an associated magnetic circuit, a coil in each generator magnetically coupled to said vibrating blade, means including a single pivoted lever for each generator for adjustably and releasably holding the blades individually in given bent positions which are determinative of the maximum amplitude of the vibrations of each blade when released, for each generator an electromagnet having a movable resilient core slug, means responsive to the energization of the electromagnet for causing said core slug to move between a rest position and a predetermined operative position and near the end of its movement toward its operative position to strike said lever so as to cause said lever to move away from said blade in a general direction toward which the blade tends to move initially when released from its bent position thereby to instantane

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Power Engineering (AREA)
  • Apparatuses For Generation Of Mechanical Vibrations (AREA)
  • Reciprocating, Oscillating Or Vibrating Motors (AREA)
  • Percussion Or Vibration Massage (AREA)
  • Lining Or Joining Of Plastics Or The Like (AREA)
  • Auxiliary Devices For Music (AREA)
  • Basic Packing Technique (AREA)
  • Binders And Loading Units For Sheaves (AREA)
  • Threshing Machine Elements (AREA)
  • Portable Nailing Machines And Staplers (AREA)
US503505A 1954-05-18 1955-04-25 Generators for producing pulses of alternating current Expired - Lifetime US2867798A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR1104914T 1954-05-18
FR66242T 1954-11-25

Publications (1)

Publication Number Publication Date
US2867798A true US2867798A (en) 1959-01-06

Family

ID=74368803

Family Applications (1)

Application Number Title Priority Date Filing Date
US503505A Expired - Lifetime US2867798A (en) 1954-05-18 1955-04-25 Generators for producing pulses of alternating current

Country Status (6)

Country Link
US (1) US2867798A (de)
BE (1) BE537263A (de)
DE (1) DE956532C (de)
ES (2) ES221810A1 (de)
FR (2) FR1104914A (de)
GB (1) GB768333A (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3656133A (en) * 1968-07-17 1972-04-11 Hitachi Susakusho Kk Data information signal generator

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1234650A (en) * 1916-09-20 1917-07-24 Thomas j peters Buzzer-transmitter.
US1489382A (en) * 1921-06-25 1924-04-08 Wico Electric Co Magneto
US2306068A (en) * 1940-12-04 1942-12-22 Bell Telephone Labor Inc Call transmitter
US2307521A (en) * 1941-07-22 1943-01-05 Bell Telephone Labor Inc Call transmitter
US2533136A (en) * 1948-01-15 1950-12-05 Wheeler Insulated Wire Company Vibratory reed signaling device
US2640973A (en) * 1948-01-06 1953-06-02 Int Standard Electric Corp Electric signal modulator

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1234650A (en) * 1916-09-20 1917-07-24 Thomas j peters Buzzer-transmitter.
US1489382A (en) * 1921-06-25 1924-04-08 Wico Electric Co Magneto
US2306068A (en) * 1940-12-04 1942-12-22 Bell Telephone Labor Inc Call transmitter
US2307521A (en) * 1941-07-22 1943-01-05 Bell Telephone Labor Inc Call transmitter
US2640973A (en) * 1948-01-06 1953-06-02 Int Standard Electric Corp Electric signal modulator
US2533136A (en) * 1948-01-15 1950-12-05 Wheeler Insulated Wire Company Vibratory reed signaling device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3656133A (en) * 1968-07-17 1972-04-11 Hitachi Susakusho Kk Data information signal generator

Also Published As

Publication number Publication date
FR66242E (fr) 1956-06-05
GB768333A (en) 1957-02-13
ES222338A2 (es) 1956-02-16
BE537263A (fr) 1955-04-30
FR1104914A (fr) 1955-11-25
DE956532C (de) 1957-01-17
ES221810A1 (es) 1955-12-16

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