US3315192A - Magnetically actuated demand contact device - Google Patents

Magnetically actuated demand contact device Download PDF

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US3315192A
US3315192A US500735A US50073565A US3315192A US 3315192 A US3315192 A US 3315192A US 500735 A US500735 A US 500735A US 50073565 A US50073565 A US 50073565A US 3315192 A US3315192 A US 3315192A
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reed
magnetic
contact
demand
contact device
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Elmer H Day
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H36/00—Switches actuated by change of magnetic field or of electric field, e.g. by change of relative position of magnet and switch, by shielding
    • H01H36/0006—Permanent magnet actuating reed switches
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R11/00—Electromechanical arrangements for measuring time integral of electric power or current, e.g. of consumption
    • G01R11/02—Constructional details

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  • This invention relates to a magnetically actuated demand contact device, and more particularly to such a device that is suitable for use in conjunction with 'electric watthour meters for actuating demand meters.
  • Integrated demand recorders are used with watthour meters to produce a separate record of kilowatt hours used during a certain selected demand interval.
  • the devices heretofore used to actuate the recording instrument which is usually separate from the watthour meter, have had undesirable qualities.
  • the cam devices of the prior art greatly increase frictional torque which reduces the accuracy at light load. This frictional torque was overcome by a compensating winding which required careful adjustment to prevent excessive speed at no load. Frequent adjustment was necessary to accommodate changes in friction as the contact device aged. Also, the friction was a function of the cam position and varied during the cam cycle.
  • the principal object of the present invention is to provide a magnetically actuated demand contact device that is simple, has small space requirements and is exceedingly compact, which is inexpensive to construct, but which is sturdy and reliable in service.
  • a further object of the present invention is to provide a magnetically actuated demand contact device that is unaffected by the intense electrical fields surrounding it.
  • a further object of the present invention is to provide a magnetically operated demand contact device that is easy to install and is readily adaptable to the different watthour meters in general use.
  • a further object of the present invention is to provide a magnetically operated demand contact device that requires a minimum of maintenance and adjustments because of the reduction of variable friction.
  • FIGURE 1 is a view in perspective of a watthour meter having the demand contact device of the invention incorporated therewith;
  • FIG. 2 is a rear elevation of the register of a watthour meter having the invention incorporated therewith;
  • FIG. 3 is a vertical sectional view, taken approximately on the line 33 of FIG. 2 and also including parts of the meter of FIG. 1;
  • FIG. 4 is a fragmentary vertical sectional view, enlarged, taken approximately on the line 44 of FIG. 3;
  • FIG. 5 is a horizontal sectional view taken approximately on the line 5-5 of FIG. 4;
  • FIG. 6 is an end elevational view of the structure shown in FIG. 5;
  • FIG. 7 is a schematic view of an electrical circuit used with a graphic meter demand recorder
  • FIG. 8 is a schematic view of the electrical circuit used with a magnetic tape demand recorder.
  • FIG. 9 is a fragmentary sectional view of a modified form of magnetic shield.
  • the watthour meter assembly 10 includes a back mounting plate assembly 11 which includes a back plate 12 of non-electrical conductive synthetic plastic material, and which is adapted to carry the conventional metal retaining ring and transparent glass cover (not shown).
  • the meter assembly 10 also includes an intermediate mounting plate 13, and in front thereof, a watthour register assembly 14.
  • the mounting plate assembly 11 includes a plurality of contact plugs (not shown) for connection to a source of electric power, the consumption and demand of which is to be recorded.
  • stator laminations 18 are shown energized by and responsive to the current flow.
  • the mag- :netic field induced in the laminations 18 is effective for rotating a disc 20.
  • the disc 20 is mounted at the center thereof on a shaft 17 which is journaled in bearings in the conventional manner, the upper bearing 21 therefor being shown as carried by a mounting plate extension 24, and held in place by a screw 27.
  • the register assembly 14 also includes a dial plate 32 parallel to and spaced forwardly from the back plate 30 and carried on rods 39.
  • the space between the back plate 30 and the intermediate plate 13 is restricted in most available meters but is sufficient to receive the compact demand contact assembly 35 of the present invention.
  • the worm wheel 26 is mounted on a register input shaft 40 which carries a worm 41.
  • the worm 41 which engages a gear 48 on a main register shaft 50 actuates through gearing 49 the respective register indicators 51 with respect to their indicia on the dial plate 32.
  • the drive shaft 40 intermediate its ends, has a cylindrical magnet 52 secured thereto for rotation therewith.
  • the magnet 52 preferably has two poles, one of which is positive (N pole) and the other of which is negative (S pole), with the magnetic flux from these poles extending radially from the cylindrical surface.
  • the magnet 52 is made from any desired material but it is preferred to employ a ceramic permanent magnet of high magnetic intensity, as it is relatively unaffected by moisture, by temperature changes, or by eddy currents and is an electrical non-conductor.
  • a suitable material for this purpose is available under the name Ceramagnet from Stackpole Carbon Co., St. Marys, Pa.
  • a reed switch mechanism 55 is provided adjustably mounted on the plate 30 and is adapted to movement towards or away from the shaft 40 at an increasing or decreasing angle with respect to the shaft 40.
  • the reed switch mechanism 55 includes a mounting frame plate 56 with an elongated slot 57 through which a mounting screw 58 extends into the back plate 30.
  • the mounting frame plate 56 has spaced arms 59 between which a block 60 of synthetic plastic insulating material is positioned.
  • the block 60 positions a reed switch capsule 62 within the arms 59.
  • the capsule 62 encloses a resilient magnetic responsive contact reed 63 having a lead 64 connected thereto and extending through one end wall of the capsule 62.
  • Spaced contacts 65 and 66 within the capsule 62 are selectively engaged by the reed 63, dependent upon the actuation of the reed 63.
  • the contacts 65 and 66 have leads 67 and 68 extending through the other end wall of the capsule 62.
  • a magnetic metallic shield 69 is provided, arcuate in shape and extending through an arc of about 120, and of a length at least as great as that of the reed 63.
  • the shield 69 has side legs 70 through which screws 71 extend into threaded engagement in the block 60 so that the shield 69 can be moved to the desired position as determined by the shielding of the reed 63 desired and required.
  • FIG. 9 a modified form of magnetic shield 69 is shown which can be of non-magnetic material such as aluminum, with a magnetic foil strip 80 secured to the interior surface 81 of the shield 69. This construction minimizes the magnetic drag by the shield on the magnet 52.
  • the lead 64 is connected to one end of the secondary winding of a transformer T 1, which serves as a source of energy.
  • the other end of the secondary winding of the transformer T1 is connected by a conductor 74, respectively, to the ends of advance coil 75 and release coil 76 for stylus operation.
  • the other ends of the coils 75 and 76 are respectively connected to the leads 68 and 67. Movement of the reed 63 will thus energize the desired coil 75 or 76.
  • the lead 64 is connected to the capacitor 78 of the tape recorder, for charging the same, through a resistor 78' to one end of the secondary winding of a supply transformer T2, the other end of the secondary winding being connected through the lead 68 to the contact 66 and thus to the reed 63.
  • the other contact 65 is connected by the lead 67 through the demand head 79 and suppressor P so that upon shifting of the reed 63 an impulse is sent through the demand head 79 to magnetize the tape.
  • the meter is actuated in the well known manner by current passing therethrough to the place of use, eddy currents effective on the disc causing rotation thereof and of the shaft 17. Rotation of the shaft 17, through the worm and worm wheel 26, rotates the shaft 40 to actuate the watthour register assembly 14.
  • the cylindrical magnet 52 carried thereby is also rotated to successively present its N and S poles toward the reed 63, thereby to attract the reed 63 as each pole approaches the reed 63 and the reed 63 engages the contact 65.
  • the pole recedes the reed 63 springs back and engages the contact 66, for demand contact meter actuation such as by the circuitry of FIG. 7 or FIG. 8 or other desired circuit.
  • the frame 56 can be turned about the pivot provided by the clamping screw 58 or moved toward or away from the magnet 52.
  • the shield 69 is positioned as found advisable to minimize the effect of the alternating field of laminations 18 of the watthour meter.
  • a compact contact device is thus provided with which the objects of the invention can be effected.
  • said device comprising,
  • said magnetic member having a periphery and poles facing said periphery
  • a reed switch carried by said mounting member and having a contact and a magnetic responsive electrical conductive reed with a free end movaible toward and away from said contact, and
  • said mounting member is adjustably mounted on said frame plate for selective positioning with respect to said magnetic member.
  • a demand contact device com-prising a frame
  • an enclosed reed switch carried in said frame and havin a magnetic responsive reed with a free end movable toward and away from a contact
  • a shielding member mounted on said frame including a portion of non-magnetic material carrying a strip of magnetic material of a length at least as great as said reed, and
  • poles being movable toward and away from said reed upon rotation of said member for moving said free end of said reed.
  • a demand contact device for use with a watthour meter having a register with an actuating shaft and comprising a permanently magnetic cylindrical member mounted on said shaft for rotation with said shaft about the central longitudinal axis of said member,
  • said magnetic member having circumferentially spaced peripheral poles with magnetic flux extending radially from said magnetic member
  • said reed switch member having a contact and a magnectic responsive conductor reed with a free end disposed radially with respect to said magnetic member and movable toward and away from said contact in response to approach and recession of said poles,
  • said mounting frame member having a shielding member carried thereby and movable in shielding relation to said reed switch.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Transmission And Conversion Of Sensor Element Output (AREA)

Description

A ril 18, 1967 E. H. DAY I 7 3,315,192
MAGNETICALLY ACTUATED DEMAND CONTACT DEVICE Filed Oct. 22, 1965 2 Sheets-Sheet 1' //VVE/V7'0/? [AMER H. DAV
ATTORNEY E H. DAY 3,315,192
MAGNETICALLY ACTUATED DEMAND CONTACT DEVICE A ril 18, 1967 2 Sheets-Sheet 2 Filed Oct. 22, 1965 United States Patent MAGNETICALLY ACTUATED DEMAND CONTACT DEVICE Elmer H. Day, 24 Hillcrest Ave., Erdenheim, Pa. 19118 Filed Oct. 22, 1965, Ser. No. 500,735 6 Claims. (Cl. 335-153) This invention relates to a magnetically actuated demand contact device, and more particularly to such a device that is suitable for use in conjunction with 'electric watthour meters for actuating demand meters.
Integrated demand recorders are used with watthour meters to produce a separate record of kilowatt hours used during a certain selected demand interval. The devices heretofore used to actuate the recording instrument, which is usually separate from the watthour meter, have had undesirable qualities. The cam devices of the prior art greatly increase frictional torque which reduces the accuracy at light load. This frictional torque was overcome by a compensating winding which required careful adjustment to prevent excessive speed at no load. Frequent adjustment was necessary to accommodate changes in friction as the contact device aged. Also, the friction was a function of the cam position and varied during the cam cycle.
In developing the invention it was observed that the presence of strong variable electromagnetic fields within and around where reeds were employed caused them to vibrate and make accidental contact.
Other prior demand contact devices, also, were not compact and required larger space than is available or desirable to employ. I
Frequent maintenance and servicing have been necessary with the devices now available.
The principal object of the present invention is to provide a magnetically actuated demand contact device that is simple, has small space requirements and is exceedingly compact, which is inexpensive to construct, but which is sturdy and reliable in service.
A further object of the present invention is to provide a magnetically actuated demand contact device that is unaffected by the intense electrical fields surrounding it.
A further object of the present invention is to provide a magnetically operated demand contact device that is easy to install and is readily adaptable to the different watthour meters in general use.
A further object of the present invention is to provide a magnetically operated demand contact device that requires a minimum of maintenance and adjustments because of the reduction of variable friction.
Other objects and advantageous features of the invention will be apparent from the description and claims. The nature and characteristic features of the invention will be more readily understood from the following description taken in connection with the accompanying drawings forming part thereof, in which:
FIGURE 1 is a view in perspective of a watthour meter having the demand contact device of the invention incorporated therewith;
FIG. 2 is a rear elevation of the register of a watthour meter having the invention incorporated therewith;
FIG. 3 is a vertical sectional view, taken approximately on the line 33 of FIG. 2 and also including parts of the meter of FIG. 1;
FIG. 4 is a fragmentary vertical sectional view, enlarged, taken approximately on the line 44 of FIG. 3;
FIG. 5 is a horizontal sectional view taken approximately on the line 5-5 of FIG. 4;
FIG. 6 is an end elevational view of the structure shown in FIG. 5;
3,315,192 Patented Apr. 18, 1967 ICC FIG. 7 is a schematic view of an electrical circuit used with a graphic meter demand recorder;
FIG. 8 is a schematic view of the electrical circuit used with a magnetic tape demand recorder; and
FIG. 9 is a fragmentary sectional view of a modified form of magnetic shield.
It should, of course, be understood that the description and drawings herein are illustrative merely, and that various modifications and changes can be made in the structure disclosed without departing from the spirit of the invention.
Like numerals refer to like parts throughout the several views.
Referring now more particularly to the drawings, a watthour meter assembly 10 of wellknown type is shown having the demand contact device in accordance with the invention mounted thereon. The watthour meter assembly 10 includes a back mounting plate assembly 11 which includes a back plate 12 of non-electrical conductive synthetic plastic material, and which is adapted to carry the conventional metal retaining ring and transparent glass cover (not shown).
The meter assembly 10 also includes an intermediate mounting plate 13, and in front thereof, a watthour register assembly 14.
The mounting plate assembly 11 includes a plurality of contact plugs (not shown) for connection to a source of electric power, the consumption and demand of which is to be recorded.
Between the mounting plate 13 and the back mounting plate assembly 11, stator laminations 18 are shown energized by and responsive to the current flow. The mag- :netic field induced in the laminations 18 is effective for rotating a disc 20. The disc 20 is mounted at the center thereof on a shaft 17 which is journaled in bearings in the conventional manner, the upper bearing 21 therefor being shown as carried by a mounting plate extension 24, and held in place by a screw 27.
by mounting pins 31 which are secured to the plate 30 and extend into sockets 37 and are held therein by screws 38.
The register assembly 14 also includes a dial plate 32 parallel to and spaced forwardly from the back plate 30 and carried on rods 39.
The space between the back plate 30 and the intermediate plate 13 is restricted in most available meters but is sufficient to receive the compact demand contact assembly 35 of the present invention.
The worm wheel 26 is mounted on a register input shaft 40 which carries a worm 41. The worm 41 which engages a gear 48 on a main register shaft 50 actuates through gearing 49 the respective register indicators 51 with respect to their indicia on the dial plate 32.
The drive shaft 40, intermediate its ends, has a cylindrical magnet 52 secured thereto for rotation therewith. The magnet 52 preferably has two poles, one of which is positive (N pole) and the other of which is negative (S pole), with the magnetic flux from these poles extending radially from the cylindrical surface. The magnet 52 is made from any desired material but it is preferred to employ a ceramic permanent magnet of high magnetic intensity, as it is relatively unaffected by moisture, by temperature changes, or by eddy currents and is an electrical non-conductor. A suitable material for this purpose is available under the name Ceramagnet from Stackpole Carbon Co., St. Marys, Pa.
A reed switch mechanism 55 is provided adjustably mounted on the plate 30 and is adapted to movement towards or away from the shaft 40 at an increasing or decreasing angle with respect to the shaft 40.
The reed switch mechanism 55 includes a mounting frame plate 56 with an elongated slot 57 through which a mounting screw 58 extends into the back plate 30.
The mounting frame plate 56 has spaced arms 59 between which a block 60 of synthetic plastic insulating material is positioned. The block 60 positions a reed switch capsule 62 within the arms 59.
The capsule 62 encloses a resilient magnetic responsive contact reed 63 having a lead 64 connected thereto and extending through one end wall of the capsule 62. Spaced contacts 65 and 66 within the capsule 62 are selectively engaged by the reed 63, dependent upon the actuation of the reed 63. The contacts 65 and 66 have leads 67 and 68 extending through the other end wall of the capsule 62.
In order to avoid the effect of the alternating field of the laminations 18, and to prevent undesired actuation of the reed 63, a magnetic metallic shield 69 is provided, arcuate in shape and extending through an arc of about 120, and of a length at least as great as that of the reed 63. The shield 69 has side legs 70 through which screws 71 extend into threaded engagement in the block 60 so that the shield 69 can be moved to the desired position as determined by the shielding of the reed 63 desired and required.
In FIG. 9 a modified form of magnetic shield 69 is shown which can be of non-magnetic material such as aluminum, with a magnetic foil strip 80 secured to the interior surface 81 of the shield 69. This construction minimizes the magnetic drag by the shield on the magnet 52.
In the demand meter circuit shown in FIG. 7, for a graphic meter of conventional type, the lead 64 is connected to one end of the secondary winding of a transformer T 1, which serves as a source of energy. The other end of the secondary winding of the transformer T1 is connected by a conductor 74, respectively, to the ends of advance coil 75 and release coil 76 for stylus operation. The other ends of the coils 75 and 76 are respectively connected to the leads 68 and 67. Movement of the reed 63 will thus energize the desired coil 75 or 76.
In the demand meter circuit shown in FIG. 8, for magnetic tape recording with conventional equipment, the lead 64 is connected to the capacitor 78 of the tape recorder, for charging the same, through a resistor 78' to one end of the secondary winding of a supply transformer T2, the other end of the secondary winding being connected through the lead 68 to the contact 66 and thus to the reed 63. The other contact 65 is connected by the lead 67 through the demand head 79 and suppressor P so that upon shifting of the reed 63 an impulse is sent through the demand head 79 to magnetize the tape.
The mode of operation will now be pointed out.
The meter is actuated in the well known manner by current passing therethrough to the place of use, eddy currents effective on the disc causing rotation thereof and of the shaft 17. Rotation of the shaft 17, through the worm and worm wheel 26, rotates the shaft 40 to actuate the watthour register assembly 14.
Upon rotation of the shaft 40 the cylindrical magnet 52 carried thereby is also rotated to successively present its N and S poles toward the reed 63, thereby to attract the reed 63 as each pole approaches the reed 63 and the reed 63 engages the contact 65. As the pole recedes the reed 63 springs back and engages the contact 66, for demand contact meter actuation such as by the circuitry of FIG. 7 or FIG. 8 or other desired circuit.
The frame 56 can be turned about the pivot provided by the clamping screw 58 or moved toward or away from the magnet 52.
The shield 69 is positioned as found advisable to minimize the effect of the alternating field of laminations 18 of the watthour meter.
A compact contact device is thus provided with which the objects of the invention can be effected.
I claim:
1. A demand contact device for use with a watthour meter having a back housing plate,
a register having a frame spaced forwardly of said back housing plate,
a current use responsive member, and
a register actuating shaft between said plates and actuated by said responsve member for actuating said register,
said device comprising,
a permanently magnetic member mounted on said shaft and rotated thereby,
said magnetic member having a periphery and poles facing said periphery,
a mounting member mounted on said frame plate,
a reed switch carried by said mounting member and having a contact and a magnetic responsive electrical conductive reed with a free end movaible toward and away from said contact, and
a shielding member for said reed carried by said mounting member.
2. A demand contact device as defined in claim 1 in which said permanently magnetic member includes ceramic material, and
said mounting member is adjustably mounted on said frame plate for selective positioning with respect to said magnetic member.
3. A demand contact device as defined in claim 1 in which said shield member is at least as long as said reed.
4. A demand contact device com-prising a frame,
an enclosed reed switch carried in said frame and havin a magnetic responsive reed with a free end movable toward and away from a contact,
a shielding member mounted on said frame including a portion of non-magnetic material carrying a strip of magnetic material of a length at least as great as said reed, and
a rotatably mounted permanent magnetic member having spaced poles on the periphery of said member,
said poles being movable toward and away from said reed upon rotation of said member for moving said free end of said reed.
5. A demand contact device for use with a watthour meter having a register with an actuating shaft and comprising a permanently magnetic cylindrical member mounted on said shaft for rotation with said shaft about the central longitudinal axis of said member,
said magnetic member having circumferentially spaced peripheral poles with magnetic flux extending radially from said magnetic member,
a mounting frame member, and
an enclosed reed switch carried, by said mounting frame member in proximity to said magnetic member,
said reed switch member having a contact and a magnectic responsive conductor reed with a free end disposed radially with respect to said magnetic member and movable toward and away from said contact in response to approach and recession of said poles,
said mounting frame member having a shielding member carried thereby and movable in shielding relation to said reed switch.
6. In a device for counting revolutions of a shaft by magnetic means in the presence of a strong magnetic 5 6 a shaft Whose revolutions are to be counted, References Cited by the Examiner a permanently magnetic member mounted on said UNITED STATES PATENTS shaft for rotation therewith,
a mounting rame memi er, 5
an enclosed reed switch carried by said mounting s f frame) member in proximity to said magnetlc 3162738 12/1964 22 gg-gg- 6 sai c i r e e switch having a contact and a magnetic re- 3,184,624 3 1 2 y 7 X sponsive conductor reed with a free end movable 10 O 9 6 Wmmss X with respect to said contact in response to move- FOREIGN PATENTS ment with respect thereto of one of said poles, 992 852 5/1965 England and a shielding member carried by said frame and dis- 1169:559 6/1964 Germany posed in shielding relation to said reed switch and shielding it from the influence of said strong mag- 15 BERNARD GILHEANY Prlma'y Examiner netic field. J. J. BAKER, R. N. ENVALL, JR., Assistant Examiners.

Claims (1)

1. A DEMAND CONTACT DEVICE FOR USE WITH A WATTHOUR METER HAVING A BACK HOUSING PLATE, A REGISTER HAVING A FRAME SPACED FORWARDLY OF SAID BACK HOUSING PLATE, A CURRENT USE RESPONSIVE MEMBER, AND A REGISTER ACTUATING SHAFT BETWEEN SAID PLATES AND ACTUATED BY SAID RESPONSVE MEMBER FOR ACTUATING SAID REGISTER, SAID DEVICE COMPRISING, A PERMANENTLY MAGNETIC MEMBER MOUNTED ON SAID SHAFT AND ROTATED THEREBY, SAID MAGNETIC MEMBER HAVING A PERIPHERY AND POLES FACING SAID PERIPHERY, A MOUNTING MEMBER MOUNTED ON SAID FRAME PLATE, A REED SWITCH CARRIED BY SAID MOUNTING MEMBER AND HAVING A CONTACT AND A MAGNETIC RESPONSIVE ELECTRICAL CONDUCTIVE REED WITH A FREE END MOVABLE TOWARD AND AWAY FWOM SAID CONTACT, AND A SHIELDING MEMBER FOR SAID REED CARRIED BY SAID MOUNTING MEMBER.
US500735A 1965-10-22 1965-10-22 Magnetically actuated demand contact device Expired - Lifetime US3315192A (en)

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Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2628297A (en) * 1946-09-20 1953-02-10 Carl T Grauer Shielded switch assembly
US2767276A (en) * 1954-06-18 1956-10-16 Buchanan Electric switch
US2922994A (en) * 1957-03-18 1960-01-26 F L Moseley Co Electrical signal generators
DE1169559B (en) * 1961-04-20 1964-05-06 Standard Elektrik Lorenz Ag Logic arrangements with protective tube armature contacts controlled by magnetic fields
US3133173A (en) * 1960-07-15 1964-05-12 Int Standard Electric Corp Rotating magnetic reed switch
US3162738A (en) * 1962-11-30 1964-12-22 Ibm Magnetically actuated switching device
US3184654A (en) * 1962-06-14 1965-05-18 Ahmet K Bey Magnetic holding device
GB992852A (en) * 1961-03-03 1965-05-26 Emmco Pty Ltd Device for transforming a rotary movement into an oscillating movement by magnetic means
US3233060A (en) * 1962-07-12 1966-02-01 Wintriss George Magnetically operated electric circuit control apparatus

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2628297A (en) * 1946-09-20 1953-02-10 Carl T Grauer Shielded switch assembly
US2767276A (en) * 1954-06-18 1956-10-16 Buchanan Electric switch
US2922994A (en) * 1957-03-18 1960-01-26 F L Moseley Co Electrical signal generators
US3133173A (en) * 1960-07-15 1964-05-12 Int Standard Electric Corp Rotating magnetic reed switch
GB992852A (en) * 1961-03-03 1965-05-26 Emmco Pty Ltd Device for transforming a rotary movement into an oscillating movement by magnetic means
DE1169559B (en) * 1961-04-20 1964-05-06 Standard Elektrik Lorenz Ag Logic arrangements with protective tube armature contacts controlled by magnetic fields
US3184654A (en) * 1962-06-14 1965-05-18 Ahmet K Bey Magnetic holding device
US3233060A (en) * 1962-07-12 1966-02-01 Wintriss George Magnetically operated electric circuit control apparatus
US3162738A (en) * 1962-11-30 1964-12-22 Ibm Magnetically actuated switching device

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