US2960186A - Spring tensioning device for the actuation of circuit breakers - Google Patents

Spring tensioning device for the actuation of circuit breakers Download PDF

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Publication number
US2960186A
US2960186A US480951A US48095155A US2960186A US 2960186 A US2960186 A US 2960186A US 480951 A US480951 A US 480951A US 48095155 A US48095155 A US 48095155A US 2960186 A US2960186 A US 2960186A
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United States
Prior art keywords
spring
electromagnet
shaft
contact
energy
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Expired - Lifetime
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US480951A
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English (en)
Inventor
Latour Andre
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.)
Merlin Gerin SA
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Merlin Gerin SA
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
    • H02K7/06—Means for converting reciprocating motion into rotary motion or vice versa
    • H02K7/065—Electromechanical oscillators; Vibrating magnetic drives
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05G—CONTROL DEVICES OR SYSTEMS INSOFAR AS CHARACTERISED BY MECHANICAL FEATURES ONLY
    • G05G25/00—Other details or appurtenances of control mechanisms, e.g. supporting intermediate members elastically
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H3/00—Mechanisms for operating contacts
    • H01H3/22—Power arrangements internal to the switch for operating the driving mechanism
    • H01H3/30—Power arrangements internal to the switch for operating the driving mechanism using spring motor
    • H01H3/3005—Charging means
    • H01H3/3021—Charging means using unidirectional coupling
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05G—CONTROL DEVICES OR SYSTEMS INSOFAR AS CHARACTERISED BY MECHANICAL FEATURES ONLY
    • G05G2700/00—Control mechanisms or elements therefor applying a mechanical movement
    • G05G2700/12—Control mechanisms with one controlling member and one controlled member
    • G05G2700/14—Control mechanisms with one controlling member and one controlled member with one elastic element as essential part, e.g. elastic components as a part of an actuating mechanism

Definitions

  • the invention provides for a device by means of which power of low magnitude is intermittently withdrawn from the source of energy, a device which makes it possible to tension the spring step by step and which is characterized by small space requirement, reduced cost and by the simplicity of the means employed as well as by the facility with which the energy withdrawn at each moment may be regulated.
  • the spring is tensioned stepwise, in intermittent action at a predetermined pulsating flow rate of energy supply, under the action of a tensioning member operated by a pulse rcsponsive driving mechanism to which energy pulses controlled by a pulse controller are supplied pulsatingly.
  • these energy pulses are intermittently supplied to the spring tensioning member through a driving mechanism which includes a motor having a reciprocatory, movable member and motion transmitting mechanism which connects the movable member with the spring tensioning member.
  • This motion transmitting mechanism will convert each cycle of the motor movement into a fraction of the total stroke of the spring tensioning member or a fraction of the spring expansion or compression whichever the case may be when the spring is tensioned.
  • the supply of energy from its source to the pulse responsive driving mechanism is under the control of a pulse controller which may intermittently connect and disconnect the source of energy to the driving mechanism or may generate directly or indirectly energy pulses to be supplied to the driving mechanism or the motor thereof.
  • the pulsating flow rate of energy by means of which the spring is to be tensioned, may readily be predetermined through proper choice of the characteristics of the pulses, viz. their amplitude, duration, the intervals between the pulses and other characteristics.
  • the electromagnet by means of a spring tensioned rocking lever and intermediary pulse responsive apparatus, will operate the spring tensioning member and will thus tension the spring, step by step,
  • the intermediary apparatus may be of the type which includes a step measuring gear by means of which the spring tensioning member is operated and the spring tensioned in steps of constant, definite length, such as by a ratchet gear, toothed rack or ratchet wheel.
  • the in termediary apparatus may also be of the type which does not produce or require actuating steps of a constant, definite length but may operate or advance the spring tensioning member in steps of indeterminate amplitude.
  • an incompressible fluid transmission or hydraulic drive, or clutches of the unidirectional wedge-grip type, or any other pulse responsive apparatus may be employed.
  • the pulsating or rhythmic energizing of the electromagnet may be effected by any conventional or convenient device, in this specification referred to as pulse controller which may also be specific apparatus developed in accordance with the invention as will be set forth hereinafter, a device or apparatus by means of which pulses of mechanical or electrical energy may be derived from a source of permanent energy.
  • pulse controller which may also be specific apparatus developed in accordance with the invention as will be set forth hereinafter, a device or apparatus by means of which pulses of mechanical or electrical energy may be derived from a source of permanent energy.
  • the pulse controller may thus be a relay, a clockwork, or a motor, periodically or pulsatingly closing and opening a switch in the energizing circuit of the electromagnet, or the pulse controller may be an electric pulse generator energizing the coil of the electromagnet by rhythmic pulses, or it may be any apparatus by means of which rhythmic pulses are produced for a pulsating, step by step operation of the spring tensioning member.
  • the pulse controller may also include or comprise control or switching means for the closing and opening of the supply circuit to the eleetromagnet or other reciprocatory motor, control or switching means which are 0p- .erated or controlled by the reciprocatory motion of the electromagnet or other .motor or of any organ reciprocated or rocked thereby.
  • Fig. 1 is a schematical elevational view, partly in sec- .tion, of a deviceof the invention in which the spring is from the electromagnet through the intermediary of a hydraulic transmission;
  • Fig. 4 is a schematical elevational view, partly in section, illustrating as an example the application .of the spring tensioning member to an oil circuit breaker for the closing of the same;
  • Fig. 5 is a schematicalelevational view of an embodiment in which the spring is tensioned, or mechanical energy accumulated, from the electromagnet through the intermediary of clutches for unidirectional wedge grip;
  • Fig. 6 is a plan view of the embodiment of Fig. 5
  • Fig. 7 is an elevational view partly in section, along line 7-7 of Fig. 6;
  • Fig. 8 is a diagram illustrating schematically the application of the operating shaft of the embodiment of Figs. and 6 to the actuation of a circuit breaker.
  • the spring to be tensioned by the device of the invention is designated by 11.
  • 12 is the spring tensioning member, in the embodiment illustrated a bar, provided with a toothed rack 13 and guided by guide rollers 14, 15.
  • the movable contact of a circuit breaker is connected to bar 12 as will be described in detail hereinafter with reference to Fig. 4.
  • the electromagnet 21 generally designates the electromagnet with its coil 22, the ferromagnetic frame or housing 23 or flux return path, and the movable magnetic core or plunger 24.
  • This pulse controller may be of any of the types hereinabove referred to, and is indicated diagrammatically in Figs. 2 and 3 by the dash-line square 30, and in the embodiment of Fig. 1 by a contact wheel 31 driven by a conventional motor 32, in the instance illustrated by an electromotor.
  • Plunger 24, by means of link 41, is coupled to a rocking lever 42 pivotal about pivot 43 and biased by spring 44 so as, when coil 22 is de-energized, to pull and return plunger 24 into the rest position shown in Figs. 1 to 3.
  • Rocking lever 42 carries at its end, pivotal about pin 49, the driving pawl 45 which, in the embodiment of Fig. l, engages the teeth of rack 13.
  • Spring 46 holds the pawl 45 resilently in engagement with these teeth.
  • a stop 52 provided at bar 12 opens, on the end of the stroke of the spring tensioning bar 12, when spring 11 is fully tensioned, the stroke limiting switch 53 and stops through the opening of line 54, 55 the energy supply to the pulse controller 30 and the electromagnet 21.
  • Fig. 2 illustrates a modification of the embodiment of Fig. 1 in which the tensioning of the spring is elfected through the rotational motion of a ratchet wheel 65.
  • the plunger 24 supplied from the pulse controller 30 to the electromagnet, the plunger 24, through the intermediary of rocking lever 42 and the driving pawl 45, imparts to the ratchet wheel 65, as indicated by the arrow G, a counter-clockwise motion which rotates the wheel one tooth, the wheel being held by the holding pawl 47 against any return movement.
  • a lever 66 secured to the wheel 65 imparts to rod 67 a movement, guided by the bearings 68, 69, in the sense of arrow H, a movement which by means of the flange ring 71 seated upon rod 67 tensions the spring 70 carried by rod 67.
  • Spring 70 may be released by any conventional release mechanism similar to that diagrammatically shown in Fig. 1, here merely indicated by arrows pointing to 62. By means of such mechanism, when spring 70 is to be released, pawls 45 and 47 will be pivoted by hand or by remote control and against the action of springs 46 and 48 out of engagement with the ratchet wheel 65.
  • Fig. 3 shows an embodiment of the invention in which the steps of the spring tensioning member are not necessarily constant and definite as in the foregoing examples.
  • the spring 72 is tensioned by the intermediary of a hydraulic mechanism, comprising the pump 75, the hydraulic jack and the reservoir 87 or other source of incompressible fluid, respectively connected by conduits 78, 86 and 88 controlled by non-return valves 79, 83 and 89.
  • non-return valves since well known in the art, are not shown here in detail but are merely indicated schematically by balls.
  • the rocking lever 42 With each energy pulse supplied to the electromagnet 21, the rocking lever 42 will impart to the piston rod 76 and the piston 77 of the hydraulic pump 75 a downward stroke which, while opening the non-return valve 79, will drive the incompressible fluid, preferably oil, contained within cylinder 75, through the conduit 78 into the space of the hydraulic jack 80.
  • the incompressible fluid preferably oil
  • piston 81 Under the pressure of the liquid delivered into the space of the hydraulic jack 80, piston 81 will move downwards and thus will execute one step and will, by means of its rod 82, tension the spring 72.
  • lever 42 and piston 77 At the end of each pulse, lever 42 and piston 77, under the action of spring 44, will return into their initial rest position. On the return movement of its piston 77, cylinder 75 is refilled with oil drawn from the reservoir 87 through conduit 88, the non-return valve 89 opening under the diminished pressure within the space 75.
  • the cycle is repeated with each pulse, until, after a predetermined number of pulses, spring 72 is completely tensioned and the energizing circuit is opened, for instance by a stop 53 provided upon the piston rod 82 and a stroke limiting switch 53, as will be described hereinafter in detail.
  • non-return valve 83 may be pushed back by hand, by a knob 84, or by remote control as indicated at 85.
  • the liquid above piston 81 may now rapidly return through conduit 86 into the reservoir 87 While the released spring 72 will pull by means of rod 82 the piston 81 rapidly upwards into its original rest position.
  • the oil circuit breaker is generally designated by 90, the terminals of a network by 91, 92.
  • the contact bridge 93 carries the movable contacts 94, 95.
  • the contact bridge is operated by the command rod 96 held under tension by spring 98 extended between the housing of the circuit breaker and a sleeve 97 with which rod 96 is secured to the contact bridge 93.
  • the stationary contacts are 99, 100, respectively, of any conventional type.
  • the contacts are provided with the conventional locking or holding means, schematically indicated at 101, 102, and with the conventional releasing means which however are not shown here in detail since they do not form any part of this invention and are well known in the art.
  • the spring tensioning bar 12 is provided at its end with a cross piece to which two catches 106, 107 are pivoted, at 108, 109, respectively.
  • the catches are inwardly drawn, resiliently, by means of a spring 110, their inward motion being stopped by abutments 111, 112 at the piece 105.
  • a truncated cone 115 is provided at the free end of command rod 96 for subsequent engagement with the catches 106, 107.
  • the pulse controller if in the form of a periodic switch as exemplified in Fig. 1, will intermittently and pulsatingly close and open, over switch 34, the energizing circuit of coil 22 of the electromagnet, thus supplying the coil with current pulses in the following circuit: Terminal 28line 54-stroke limiting switch 53l-ine 55- line 59coil 22line 60switch 34-]ine 61-line 58 terminal 28.
  • the pulse generator when a pulse generator is employed as pulse controller, the pulse generator will intermittently and rhythmically supply directly these current pulses to coil 22 over lines 59, 60.
  • the length of the stroke of the plunger 24 may be adjusted by means of the abutments 37, 38, and the adjustment of the set screws 35, 36, so that the stroke of the plunger corresponds to the pitch of the toothed rack or of the ratchet wheel, the ratio of the length of the levers being taken into account.
  • the abutment or stop 52 opens the stroke limiting contact 53 and thus cuts ofli the energy supply to the electromagnet.
  • the spring 11 When the circuit breaker is to be closed, the spring 11 will be released by any conventional or convenient means, for instance by the lever mechanism schematically indicated in Fig. 1.
  • the circuit breaker may subsequently be opened by releasing the blocking means of contact bridge 93 as conventional in the art and thus not shown here.
  • stroke limiting contact 53 will conveniently be a retarded closing contact.
  • the air-space above or the stroke of the electromagnet plunger 24 will correspond, as already pointed out hereinabove, to the pitch of the teeth of rack 13.
  • the air-space is determinative of the power withdrawn from the network for energizing the electromagnet.
  • the device of the invention may be adapted by extremely simple means to the capacity of the energy source or to the magnitude of the power which it is intended to withdraw from this source.
  • the part 13 which carries the teeth of the rack may be made exchangeable.
  • the velocity with which the spring will be tensioned may also be varied by regulating the frequency of the pulses produced in the pulse controller 30, under the condition, of course, that the type of pulse controller employed allows of such regulation.
  • the device as. illustrated in Figs. 2 and 3 may similarly be connected at or by means of the rods 67, 81 to the movable equipments of circuit breakers for actuating them by means of springs 70 and 72 and that the devices may actuate the circuit breakers by means of expansion springs, Figs. 1 and 3, as well as by compression springs, Fig. 2.
  • Figs. 5 to 8 illustrate a further embodiment of the invention where the necessity of imposing upon the electromagnet 'a definite stroke is advantageously avoided.
  • the electromagnet 21 with its plunger 24- is operatively connected through a unidirectional wedge-grip clutch to a shaft 131 carried in bearings 132, 133.
  • a second unidirectional wedge-grip clutch is provided between shaft 131 and a stationary point of the framework.
  • Each clutch includes a Wheel rim or ring 134, 137, respectively, carried freely revolvable upon a hub 135, 138 secured to the shaft 131.
  • Each of the clutches further comprise a cam disc 139, 143, respectively, secured to the hubs 135, 136, the cam discs being provided with cam rises 140, 144.
  • Cam rollers or balls 141, 145, or other elements with releasable wedge action are urged by springs 142, 146 between the cam rises 140, 144 and the inner circumferences of the rings 134, 137.
  • Figs. 5 and 7 show that disc 139 and ring 134 grip each other through wedging of the cam rollers when ring 134is rotated clockwise relatively to cam disc 139 or when the cam disc is rotated counter-clockwise relatively to ring 134 and, conversely, that the grip between both is released when ring 134 is rotated couter-clockwise relatively to the cam disc 139 or when the cam disc 139 is rotated clockwise relatively to ring 134.
  • Ring 137 and cam disc 143 are operative in the same sense.
  • Ring 134 carries a rocking lever 148 which by means of link 41 is connected to the movable core or plunger 24 of the electromagnet. With each. power stroke of plunger 24, ring 134 will grip cam disc 139 and, by means of hub 135 will thus advance the shaft one step, the amplitude of which is indeterminate and will readily adapt itself to the prevailing conditions of the mechanism.
  • a spring 149 extended between the rocking lever 148 and the framework of the apparatus will effect the return stroke of plunger 24. With this return stroke, ring 134 will be rotated counter-clockwise and will release the grip on cam disc 139 and thus on shaft 131. Any return movement of shaft 131 is prevented through the second clutch device. Ring 137 of this device is held from rotation by a lever 150 of one piece with it and secured at its free end to a bracket 151. The clutch of this device, Fig. 7, will release its carn disc 1 53 and thus shaft 131 with each advance movement, clockwise, of the shaft, will however wedge the cam rollers 145 between the cam rises 144 and the inner circumference of ring 137 and will thus block shaft 131 when this shaft tends to return, counter-clockwise.
  • Shaft 131 is operatively connected, by means of intermediary mechanism with the head 155 of the spring tensioning member, push rod 154, of the spring 152 which is to be tensioned and is thus to be charged as an energy accumulator with mechanical energy through the periodic drive of the electromagnet, as will be described in detail hereinafter.
  • This pulse controller may be of any one of the types hereinabove described with reference to the preceding figures or may be of the specific type illustrated in Fig. 5 which will now be described.
  • the motion of the driving mechanism itself is employed for periodically supplying and cutting off the energy to the driving mechanism.
  • the electric energy is supplied to the coil 22 of the electromagnet from an electric network 160.
  • the intermittent command apparatus is generally designated by 161.
  • a contact 172 is provided upon the shaft 131 rotating therewith.
  • Contact 172 is connected through line 162 with one terminal of the network 161) and may slide upon a ring-shaped contact rail 173 and finally reach, in the tensioned position of the spring, a contact 176 separated from rail 173 through an air gap 163.
  • Rail 173 is connected at its one terminal A through line 164 to the one terminal of coil 22, the other terminal of the coil leading over the command apparatus 161 and line 165 to the other terminal of the network 160.
  • the command apparatus 161 includes a tumbler switch 177 pivotal about pin 181 and about the axis of a pin 182 tiltable with it and through a slot of which it may slide. Arm 183 of the tumbler switch carries the contact 179 opposite a stationary contact 178 for cooperation therewith.
  • the tumbler contact is operated by a finger 180 secured to the rocking lever 148 so that at the end of each downward or power stroke of the plunger 24, the tumbler contact is tilted counter-clockwise about pin 181 and thus opens the contacts 178, 179
  • the lever of this switch is in form of a toggle lever, comprising the toggle arms 183, 184 articulated at 185.
  • Toggle arm 184 is slidable within the swivel pin 182, and the toggle sys tem is urged into the broken positions by means of a spring 186, carried upon arm 184 and tensioned between swivel pin 182 and the head of arm 184 at the joint 185.
  • the device operates as follows:
  • the device as shown in Fig. 5 is in the position where the spring 152, which is to actuate the mobile equipment of a circuit breaker, is tensioned and the device thus is ready to close the circuit breaker.
  • This may be effected, for instance, by means of shaft 131 which may be coupled to the command shaft 191 of a circuit breaker by any conventional or convenient means.
  • Shaft 131 is shown as provided with a cam finger 187 which when shaft 131 is turned clockwise will strike against a earn 188 on the command shaft 191 of the movable lever 189 of a circuit breaker 190 and will thus pivot the lever into the closed position.
  • crank arm and the link 156 are in the dead point or stretched position of the toggle joint they form, thus both members are in the direction of the axis O-X, the extension of the axis of spring 152.
  • Contact 172 is upon contact 176, as illustrated, and the current is interrupted.
  • the command 161 is at rest.
  • a push button contact 175, connecting contact 176 to line 164, is closed.
  • the energizing circuit of magnet coil 22 is thus closed in the following circuit: Network line 162contact 172-contact 176push button contact 175line 164- coil 22contacts 178, 179-line -network160.
  • the plunger 24 of the electromagnet is pulled downwards and, by means of link 41 and rocking lever 148, rocks ring 134 and advances it one step, clockwise.
  • 'Clutch 139 grips hub 135 and turns shaft 131, thus moving thecrank am 155 out of the dead point position.
  • Spring 152 is abruptly released, unimpeded by the clutches 139, 143 anddrives the crank arm clockwise and with it the shaft 131 one step.
  • Shaft 131 by means. of the cam mechanism 187, 188 or by any other convenient or conventional means will actuate the command shaft 191 and close the circuit breaker 189, 190.
  • contacts 178, 179 may be shunted by a capacitance 166, and the coil 22 by a resistor 167.
  • a device as set forth in claim 1 including a crank arm mounted upon said shaft, a connecting rod connecting said crank arm to said spring tensioning member, said crank arm and said connecting rod constituting a toggle joint disposed with relation to said spring tensioning member so as to allow full revolution of the shaft with passage through the stretched position of the joint, the spring suddenly being released under its tension in a first part of the revolution through collapse of the joint in the sense and towards the side of the advance motion of the shaft, the spring being tensioned through continued rotation of the shaft in the same sense until, on further movement in the same sense, the joint approaches from the other side its stretched position; detensioning of the spring and collapsing of the joint during this phase of operation being prevented through the cooperation of the clutches.
  • a spring tensioning device particularly for the actuation of circuit breakers, including a spring, a tensioning member connected to said spring, an electromagnet, motion transmitting mechanism including a spring tensioned rocking lever linked to the movable core of the electromagnet, and intermediary mechanism operatively connecting said rocking lever to said spring tensioning member; supply lines electrically connecting said elec tronmgnet to a source of electric energy, a pulse controller associated with said supply lines, said pulse controller including switching means operatively connected to said rocking lever and connected to said supply lines, thereby on rocking motion of the rocking lever, alternatingly to connect and disconnect said electromagnet to and from the source of energy and thus to operate said spring tensioning member and tension the spring at a predetermined pulsating flow rate of the driving energy supplied to the spring tensioning member.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Automation & Control Theory (AREA)
  • Driving Mechanisms And Operating Circuits Of Arc-Extinguishing High-Tension Switches (AREA)
  • Transmission Devices (AREA)
  • Breakers (AREA)
US480951A 1954-01-28 1955-01-10 Spring tensioning device for the actuation of circuit breakers Expired - Lifetime US2960186A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR1086784X 1954-01-28

Publications (1)

Publication Number Publication Date
US2960186A true US2960186A (en) 1960-11-15

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ID=9612945

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Application Number Title Priority Date Filing Date
US480951A Expired - Lifetime US2960186A (en) 1954-01-28 1955-01-10 Spring tensioning device for the actuation of circuit breakers

Country Status (7)

Country Link
US (1) US2960186A (ja)
BE (1) BE534765A (ja)
CH (1) CH323443A (ja)
DE (1) DE1086784B (ja)
FR (2) FR1098724A (ja)
GB (1) GB776025A (ja)
NL (1) NL194310A (ja)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2763155A1 (en) * 2013-02-01 2014-08-06 General Electric Company Electrical operator for circuit breaker and method thereof
US10319544B2 (en) * 2017-06-16 2019-06-11 Eaton Intelligent Power Limited Bolted pressure switch motor arrangement

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS55108119A (en) * 1979-02-13 1980-08-19 Tokyo Shibaura Electric Co Motorrdriven spring operating device for circuit breaker
JPS57154739A (en) * 1981-03-19 1982-09-24 Tokyo Shibaura Electric Co Device for operating circuit breaker
FR2523763A1 (fr) * 1982-03-19 1983-09-23 Telemecanique Electrique Dispositif amovible de verrouillage d'un contacteur dans sa position de travail
FR2593323B1 (fr) * 1986-01-17 1990-10-26 Merlin Gerin Electro-aimant a armature vibrante d'armement d'un ressort d'un appareil de coupure de courant
DE3874500D1 (de) * 1987-12-14 1992-10-15 Sprecher Energie Ag Federkraftspeicherantrieb fuer einen hochspannungsschalter.

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10128A (en) * 1853-10-18 Improvement in self-winding telegraphic registers
USRE22853E (en) * 1934-08-15 1947-03-18 Circuit interrupter
US2470675A (en) * 1944-02-01 1949-05-17 Reyrolle A & Co Ltd Spring-operated driving mechanism
US2646660A (en) * 1946-01-11 1953-07-28 Schild Otto Self-winding clock
US2674345A (en) * 1951-10-25 1954-04-06 Gen Electric Instantaneous latch released energy storing load operating device

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE147860C (ja) *
DE645325C (de) * 1937-05-26 Allg Elek Citaets Geseelschaft Kraftspeicher mit elektromotorischem Antrieb, insbesondere fuer Leistungsschalter
GB496414A (en) * 1937-06-30 1938-11-30 English Electric Co Ltd Improvements in spring mechanism
GB537180A (en) * 1939-12-11 1941-06-12 British Thomson Houston Co Ltd Improvements relating to closing mechanism for an electric circuit breaker

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10128A (en) * 1853-10-18 Improvement in self-winding telegraphic registers
USRE22853E (en) * 1934-08-15 1947-03-18 Circuit interrupter
US2470675A (en) * 1944-02-01 1949-05-17 Reyrolle A & Co Ltd Spring-operated driving mechanism
US2646660A (en) * 1946-01-11 1953-07-28 Schild Otto Self-winding clock
US2674345A (en) * 1951-10-25 1954-04-06 Gen Electric Instantaneous latch released energy storing load operating device

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2763155A1 (en) * 2013-02-01 2014-08-06 General Electric Company Electrical operator for circuit breaker and method thereof
CN103971997A (zh) * 2013-02-01 2014-08-06 通用电气公司 用于断路器的电力操作器及其方法
US9184014B2 (en) 2013-02-01 2015-11-10 General Electric Company Electrical operator for circuit breaker and method thereof
CN103971997B (zh) * 2013-02-01 2018-03-30 通用电气公司 用于断路器的电力操作器及其方法
US10319544B2 (en) * 2017-06-16 2019-06-11 Eaton Intelligent Power Limited Bolted pressure switch motor arrangement

Also Published As

Publication number Publication date
GB776025A (en) 1957-05-29
CH323443A (fr) 1957-07-31
FR66247E (fr) 1956-06-05
DE1086784B (de) 1960-08-11
FR1098724A (fr) 1955-08-18
BE534765A (ja)
NL194310A (ja)

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