US3103562A - Magnetic ball switch for electric circuits - Google Patents

Magnetic ball switch for electric circuits Download PDF

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US3103562A
US3103562A US3103562DA US3103562A US 3103562 A US3103562 A US 3103562A US 3103562D A US3103562D A US 3103562DA US 3103562 A US3103562 A US 3103562A
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tube
thimble
contacts
longitudinally
switch
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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
    • H01H36/02—Switches actuated by change of magnetic field or of electric field, e.g. by change of relative position of magnet and switch, by shielding actuated by movement of a float carrying a magnet
    • 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

Definitions

  • the permanent magnet is of Indox, a material having Ia high energy product, high coercive force and good sta- Any other net need not be circular las bar magnets, horse shoe mag- Vnets, and magnets of other shapes maybe used. However, ring magnets of the sintered ceramic type are used.
  • the contact terminals and ball slug may be plated with
  • the enclosing tubes of dielectric rnlaterial may of glass, quartz, lavite ⁇ epoxy resin, vTeilen or Kel-'F materials.
  • FIGS. 4-7 an arrangement of switches of my invenk tio-n for indicating the position of a reactor rod is shown.
  • each ofra succession of ball slugs 41 is movable in a channel 42 of its switch housing 43 of non-conductive or dielectric material from the position shown in full lines to that shown in broken lines.
  • vIn the latter position it *bridges la pair of spaced contacts vention and is thereto-re not illustrated. It may be any suitable electrically operated device as, for example, one
  • a separator 48 of insulating material which may lbe an extension of the housing 43 of an adjacent switch.
  • the hou-.sings 43 are enclosed in a tube 49 which iis slit at 50 and 51, FIGS. 6 and 7, on diametrically opposite sides to permit projections 52 of the contacts 44 and 45 to extend therethrough for connection to the leads 46 and 47.
  • the lead 46 vextends longitudinally of the tube in the slot on one side of the tube and is threaded through beads 53' of glass or other insulating ntaterial.
  • a washer 54 of dielectric niaterial is placed between successive housings 43, being centered by la round projection 55 of one housing extending into :a hole of the washer and havin-g projecting ears 56 to receive the leads 46 and 47.
  • the leads 47 are insulated by a jacket of insulating material which.4 lfor use lat elevated temperatures, may be of Generalon.
  • the tube y49 is enclosed in a thirnble 57, closed at its ⁇ .freeend by a'plug 58 recessed to receive one end of the tube 49.r It is spaced axially inthe thirnble by theplug l 58 and at intervals in its length by spacers 59 which may characters as in FIGS. 4-7.
  • rIlhe tube, thimble and spacers 59 are of non magnetic material.
  • the ball plugs 41 are moved to and from the contacts 44 and l45 by a magnetic field generated by a magnetized ning 64 encircling and slidable longitudinally of the thimble.
  • the ring is carried by rods 65 movable 'longi- 'tudinally of the thimble by a moving part of the reactor apparatus. ⁇ As'the ring moves in one direction ory the other its magnetic field moves successive ball slugs to or from the contacts, thusputting into or removing successive resistances.
  • l v FIGS. 8 to l1 show lan arrangement similar to that of FIGS. 4 to 7 except that resistances for the several switches lare incorporated in the tube. elements are therefore identified with the same reference
  • the successive switch housings ⁇ 43 ⁇ are separated and spacedby resistor housings 66, eachucontaining a resistor l67.
  • insulated lead wire 68 extends fromeach resistor to the next 4and lis also electrically Vconnected to ⁇ the projection 52 of each contact 45 to connect these contacts in series.
  • the ball slug 41 of each switch is moved by the magnetic field .into contact with ther contacts l44 and 45 it closes a circuitv between the wires 46 and 68 and short oircuitsthe resistors farther Ifror'n' the fixed end of tem is similar to that of FIGS. 8 land 10 except that,
  • the magneticiield may be such that combinations of two successive switclhes can be closed simultaneously so that a continuous stepping indication is provided,
  • the d Yswitch ⁇ apparatus is mounted in the top of a tank which,
  • the tank is provided. with a mounting plug 72 threaded in an opening in rthe top of the tank so that it may be removed.
  • the plug has a central hole 73 provlded with a lower threaded part y74 of vlesser diameter into which is threaded a plug 75 having a projection 76 to which is secured the upper end of a tube 77 similar .tothe switch carrying ⁇ tube described above.
  • -By screwing the' 'plug upwardly or downwardly, the position of the tube may be adjusted vertically.
  • the tube is ⁇ slit'on diametrically opposite sides and its lower end is closed.
  • a numberfof ball slug housings 78 are mounted in the tube, the lowermost resting on the bottom of the tube and each being provided with a pair of spaced contacts ⁇ 79 and 'S0 andwith each of the housings, excepting thev v bottom one, restingon the contacts olf the housing just beneath it; These housings are of non magnetic, insulating', material- Each pair of contacts may be held spaced by a tongue 81 of the next higher housing extending into the space between thecontacts. The'housiingsare held vin.closelypacked contact by a screw plug 82. threaded in a vertical, fthreaded,'hole 86 in the mounting plug TZ Corresponding pressing downwardly on a pressure plug 84 which bears i on the uppermost housing.
  • Each housing has a chamber 85 in which is a ball slug 86 of magnetic material movable vertically upwardly by an upwardly movable magnetic iield to bridge the contacts 79 and 80.
  • I'he contacts 79 are connected in series to a common lead ⁇ 87 while each of the contacts 80' is connected to an individual lead 88.
  • These several leads extend to resistances not shown, outside the tank which control electric energy changes which actuate an indicating means.
  • the tube 77 is enclosed co-axially in a thimble 819 secured at its upper end to the mounting plug 72 and closed at its lower end by a plug 90 having a central recess -91 in wlhicli Ithe lower end of the tube is guided in its vertical adjustment.
  • the thimble 89 is co-axially enclosed in a cylinder 92 secured at its upper end to the mounting plug 72 and having a bottom Wall with a recessed, upwardly extending boss 93 in which the plug 90' is positioned.
  • 'Ilhe wall of the cylinder 92 is provided with a series off vertically spaced groups of openings 94' through which liquid may flow into and out of a space 95 between the thimble and the imite-rior surface of the cylinder.
  • the outer surface orf the cylinder carries level indicating marks 918l to which the contacts 719l and 80 are made to match by an adjustment of the tube 77.
  • the level in the tank may be indicated accurately by an indicator system mechanism outsidev the tank. inasmuch as the contacts are enclosed within the thimb'le lthey are separated from the liquid and from any combustible vapors in case the liquidV in the tank evolves combustible vapors. Tlhe magnetized ring 97 cannot cause any sparking.
  • a switch circuit for indicating the position of a movable mass which comprises a thimble of non-magnetic material having one end closed and the opposite end tted for attachment to a support, the closed end of said thimble having an axially extending guide surface; a tube mounted co-axially in said thimble and being slidably guided by said guide surface for adjustment longitudinally in said fthimble, said tube being of lesser diameter than said thimble to provide an annular space; means at the end opposite 4said guided surace to support said tube in positions of longitudinal adjustment; a series of electric 6 switches in, and spaced longitudinally of, said tube, each said switch comprising a housing having a longitudinally extending chamber, a pair of spaced contacts at one end of said chamber, and a magnetic ball slug movable in said chamber to bridge said contacts; an electric circuit having connections to said contacts to close short circuits therethrough; a magnetized ring in said annular space movable longitudinally of said tube and encircling said
  • the switch circuit of claim 1 having a lead connecting one of each pair of contacts in series and separate leads connected to the other contacts of each pair of contacts.
  • the switch circuit of claim 1 hav-ing a rod movable longitudinally of said tube and attached to said magnetized ring to move said ring longitudinally of said tube.
  • the switch circuit of claim 1 having resistances l positioned between said switches, a lead connecting one contact of each switch in series with the others and leads connecting each of the other contacts with the resistances positioned betweenV said switches.
  • each resistance comprises a spacer of insulating material and a resistance coil wound on said spacer.
  • the switch circuit of claim l having a cylinder enclosing and co-axial with said thimble and forming an annular space about said thimble, said cylinder having openings to admit liquid into said annular space through said openings.
  • the switch circuit of claim 8 having means to adjust said tube longitudinally of said cylinder.

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  • Switches That Are Operated By Magnetic Or Electric Fields (AREA)

Description

E. J. Dl NolA 3,103,562
MAGNETIC BALL .SWITCH FOR ELECTRIC CIRCUITS I sept.- 1o, 1963 5 Sheets-Sheet l Filed July 50, 1959 INVENTOR. EMANUEL J. DI Nom ATTORNEY Sept. 10, 1963 E. J. Dl NolA 3,103,562
MAGNETIC BALL swITCH ECR ELECTRIC CIRCUITS Filed July so, 1959 5 sheets-sheet 2 /IIIIUIIIIIINN E 4@ 1N V EN TOR.
EMQNUEL J` D: Nom
HTTOENEY Sept. 10, 1963 E. J. DI NolA MAGNETIC BALL swITCH TOR ELECTRIC CIRCUITS 5 Sheets-Sheet 3 Filed July 50, 1959 INVENTOR. EMANUEL J` DI Nom @WLM HTTOPNET Sept. 10, 1963 E. J. DI NOlA MAGNETIC BALL SWITCH FOR ELECTRIC CIRCUITS Filed July 50, 1959 IIHIIII IHHIIIIIIHIIHIIIIHIIIHIIIHII III! IIII |IIl||IIIIIIIIIIIIIIIIIIIHIII IIIIIHIIIIHHII IHIIIIIII 5 Sheets-Sheet 4 INVENTOR. EMANUEL J. DI Nom BY @Vy/TIM HTTO EN EY Sept. 10, 1963 E. J. DI NOIA MAGNETIC BALL SWITCH FOR ELECTRIC CIRCUITS Filed July so, 1959 TELTIE.
5 Sheets-Sheet 5 u u J U ---e5/ 92 6o% ^--55% Qqv: f --5o% --QOZ JNVENToR. EMQNUEL J DI Nom QTTO ENE Y TcllZ.
'bilization within Wide temperature ranges. material of these characteristics may be used. The mag- `in FIGS. 2 and 3, it will be understood that this assembly may be repeated :at spaced elevations in a container to indicate the level at corresponding intervals in the` height of the container.
their magnetism rand the ball slug immediately rbreaks away from the terminals.
The permanent magnet is of Indox, a material having Ia high energy product, high coercive force and good sta- Any other net need not be circular las bar magnets, horse shoe mag- Vnets, and magnets of other shapes maybe used. However, ring magnets of the sintered ceramic type are used.
- The contact terminals and ball slug may be plated with The enclosing tubes of dielectric rnlaterial may of glass, quartz, lavite `epoxy resin, vTeilen or Kel-'F materials.
yIn FIGS. 4-7 an arrangement of switches of my invenk tio-n for indicating the position of a reactor rod is shown.
In this arrangement a series of switches is placedin spaced, longitudinal sequence in 1an enclosin g tube in such rnanner that they bridge an-d close an electric circuit trom a common lead to` several leads leading from the successive switches` to a suitablerindicating device. The
switches Iare closed rand Iopened in successive sequence by the magnetic iieldy of a permanent magnet carried on a reactor rod movable lengthwise of the series of switches. Accordingly when the reactor rod is in any position its magnet closes .a corresponding switch. The successive circuits closed in this manner actuate the position indicator through a resistance system or other known actuating device. l i
v Referring to FIG. 5, each ofra succession of ball slugs 41 is movable in a channel 42 of its switch housing 43 of non-conductive or dielectric material from the position shown in full lines to that shown in broken lines.
vIn the latter position it *bridges la pair of spaced contacts vention and is thereto-re not illustrated. It may be any suitable electrically operated device as, for example, one
Ain which the lead 46 is grounded and the individual leads 47 are connected between resistances in series to control an indicator `operating current or voltage.
rllhe conta-cts `44 and 4S lare separated by a separator 48 of insulating material, 'which may lbe an extension of the housing 43 of an adjacent switch. |The hou-.sings 43 are enclosed in a tube 49 which iis slit at 50 and 51, FIGS. 6 and 7, on diametrically opposite sides to permit projections 52 of the contacts 44 and 45 to extend therethrough for connection to the leads 46 and 47. The lead 46 vextends longitudinally of the tube in the slot on one side of the tube and is threaded through beads 53' of glass or other insulating ntaterial. A washer 54 of dielectric niaterial is placed between successive housings 43, being centered by la round projection 55 of one housing extending into :a hole of the washer and havin-g projecting ears 56 to receive the leads 46 and 47. vThe leads 47 are insulated by a jacket of insulating material which.4 lfor use lat elevated temperatures, may be of Teilon.
The tube y49 is enclosed in a thirnble 57, closed at its `.freeend by a'plug 58 recessed to receive one end of the tube 49.r It is spaced axially inthe thirnble by theplug l 58 and at intervals in its length by spacers 59 which may characters as in FIGS. 4-7.
also serve to hold the leads 46 and 47 in position. 'Ilhe other end of the tube is held in a nut 60 which turns freely on the tube and is threaded in threads 61 in the thimblle to enable the position of -the tube to be adjusted in its axial position relative to the thimble. The nut 60 may be locked in its adjusted position byk means ott a lock nut 62. The leads pass through a plate 63 spanning the end off the thimble opposite the plug 58. This end oi the thimble may be threaded externally for mounting on a xed part of the reactor structure. rIlhe tube, thimble and spacers 59 are of non magnetic material.
The ball plugs 41 are moved to and from the contacts 44 and l45 by a magnetic field generated by a magnetized ning 64 encircling and slidable longitudinally of the thimble. The ring is carried by rods 65 movable 'longi- 'tudinally of the thimble by a moving part of the reactor apparatus. `As'the ring moves in one direction ory the other its magnetic field moves successive ball slugs to or from the contacts, thusputting into or removing successive resistances.l v FIGS. 8 to l1 show lan arrangement similar to that of FIGS. 4 to 7 except that resistances for the several switches lare incorporated in the tube. elements are therefore identified with the same reference In the modification shown in FIGS. 8 and 1'0, the successive switch housings `43` are separated and spacedby resistor housings 66, eachucontaining a resistor l67. An
insulated lead wire 68 extends fromeach resistor to the next 4and lis also electrically Vconnected to `the projection 52 of each contact 45 to connect these contacts in series. As the ball slug 41 of each switch is moved by the magnetic field .into contact with ther contacts l44 and 45 it closes a circuitv between the wires 46 and 68 and short oircuitsthe resistors farther Ifror'n' the fixed end of tem is similar to that of FIGS. 8 land 10 except that,
instead orf the wires 68 extending into the housings 66,
they are connected to electrically conductive plates 69,
one at each' end or the housings 43 and electrically connected to 'the ends of resistance coils 70 wound on insulating spacers` 71y extending from one housing Ito the next.
The magneticiield may be such that combinations of two successive switclhes can be closed simultaneously so that a continuous stepping indication is provided, For
example, switches 1 and 2'c1ose simultaneously, then `2y and 3', then 3 and 4 and so on. Tlhe arrangement of the switches foruse with a float 1s shown in FIGS. l2 and 13. In this arrangement the d Yswitch `apparatus is mounted in the top of a tank which,
as shown in the drawings, is a horizontal, cylindrical, tank and extends vertically downwardly to nearly the bottorn. ,The tank is provided. with a mounting plug 72 threaded in an opening in rthe top of the tank so that it may be removed. The plug has a central hole 73 provlded with a lower threaded part y74 of vlesser diameter into which is threaded a plug 75 having a projection 76 to which is secured the upper end of a tube 77 similar .tothe switch carrying `tube described above. -By screwing the' 'plug upwardly or downwardly, the position of the tube may be adjusted vertically. The tube is` slit'on diametrically opposite sides and its lower end is closed.
y. A numberfof ball slug housings 78 are mounted in the tube, the lowermost resting on the bottom of the tube and each being provided with a pair of spaced contacts` 79 and 'S0 andwith each of the housings, excepting thev v bottom one, restingon the contacts olf the housing just beneath it; These housings are of non magnetic, insulating', material- Each pair of contacts may be held spaced by a tongue 81 of the next higher housing extending into the space between thecontacts. The'housiingsare held vin.closelypacked contact by a screw plug 82. threaded in a vertical, fthreaded,'hole 86 in the mounting plug TZ Corresponding pressing downwardly on a pressure plug 84 which bears i on the uppermost housing.
Each housing has a chamber 85 in which is a ball slug 86 of magnetic material movable vertically upwardly by an upwardly movable magnetic iield to bridge the contacts 79 and 80. I'he contacts 79 are connected in series to a common lead `87 while each of the contacts 80' is connected to an individual lead 88. These several leads extend to resistances not shown, outside the tank which control electric energy changes which actuate an indicating means.
The tube 77 is enclosed co-axially in a thimble 819 secured at its upper end to the mounting plug 72 and closed at its lower end by a plug 90 having a central recess -91 in wlhicli Ithe lower end of the tube is guided in its vertical adjustment.
The thimble 89 is co-axially enclosed in a cylinder 92 secured at its upper end to the mounting plug 72 and having a bottom Wall with a recessed, upwardly extending boss 93 in which the plug 90' is positioned. 'Ilhe wall of the cylinder 92 .is provided with a series off vertically spaced groups of openings 94' through which liquid may flow into and out of a space 95 between the thimble and the imite-rior surface of the cylinder.
A11 annular float 96 in the space 95- and encircling the thimble t89 nises and falls with the rise and fall of the liquid level in the space 915 and carries an annular magnetized ring 97 which creates a magnetic field through the walls of the thimble and tube, which are of nonmlagne-tic material, to move the ball slugs of successively higher level into bridging contact with their contacts as the level of the liquid rises and conversely carries ball slugs of successively lower level into contact as the liquid level falls.
The outer surface orf the cylinder carries level indicating marks 918l to which the contacts 719l and 80 are made to match by an adjustment of the tube 77.
Through the above combination, the level in the tank may be indicated accurately by an indicator system mechanism outsidev the tank. inasmuch as the contacts are enclosed within the thimb'le lthey are separated from the liquid and from any combustible vapors in case the liquidV in the tank evolves combustible vapors. Tlhe magnetized ring 97 cannot cause any sparking.
` Having described my invention, I claim:
1. A switch circuit for indicating the position of a movable mass which comprises a thimble of non-magnetic material having one end closed and the opposite end tted for attachment to a support, the closed end of said thimble having an axially extending guide surface; a tube mounted co-axially in said thimble and being slidably guided by said guide surface for adjustment longitudinally in said fthimble, said tube being of lesser diameter than said thimble to provide an annular space; means at the end opposite 4said guided surace to support said tube in positions of longitudinal adjustment; a series of electric 6 switches in, and spaced longitudinally of, said tube, each said switch comprising a housing having a longitudinally extending chamber, a pair of spaced contacts at one end of said chamber, and a magnetic ball slug movable in said chamber to bridge said contacts; an electric circuit having connections to said contacts to close short circuits therethrough; a magnetized ring in said annular space movable longitudinally of said tube and encircling said tube to provide a longitudinally movable magnetic fieldk therein to move said ball slugs to and from said contacts.
2. The switch circuit of claim 1 having a lead connecting one of each pair of contacts in series and separate leads connected to the other contacts of each pair of contacts.
3. The switch circuit of claim l having insulating spacers between the contacts of each pair.
4. The switch circuit of claim 1 hav-ing a rod movable longitudinally of said tube and attached to said magnetized ring to move said ring longitudinally of said tube.
5. The switch circuit of claim 1 having resistances l positioned between said switches, a lead connecting one contact of each switch in series with the others and leads connecting each of the other contacts with the resistances positioned betweenV said switches.
6. The switch circuitof claim 5 in which said resisrtances are enclosed in insulating housings.
7. The switch circuit of claim 5 in which each resistance comprises a spacer of insulating material and a resistance coil wound on said spacer.
8. The switch circuit of claim l having a cylinder enclosing and co-axial with said thimble and forming an annular space about said thimble, said cylinder having openings to admit liquid into said annular space through said openings.
9. The switch circuit of claim 8 having means to adjust said tube longitudinally of said cylinder.
References Cited in the le of this patent UNITED STATES PATENTS Great Britain Apr. 9,

Claims (1)

1. A SWITCH CIRCUIT FOR INDICATING THE POSITION OF A MOVABLE MASS WHICH COMPRISES A THIMBLE OF NON-MAGNETIC MATERIAL HAVING ONE END CLOSED AND THE OPPOSITE END FITTED FOR ATTACHMENT TO A SUPPORT, THE CLOSED END OF SAID THIMBLE HAVING AN AXIALLY EXTENDING GUIDE SURFACE; A TUBE MOUNTED CO-AXIALLY IN SAID THIMBLE AND BEING SLIDABLY GUIDED BY SAID GUIDE SURFACE FOR ADJUSTMENT LONGITUDINALLY IN SAID THIMBLE, SAID TUBE BEING OF LESSER DIAMETER THAN SAID THIMBLE TO PROVIDE AN ANNULAR SPACE; MEANS AT THE END OPPOSITE SAID GUIDED SURFACE TO SUPPORT SAID TUBE IN POSITIONS OF LONGITUDINAL ADJUSTMENT; A SERIES OF ELECTRIC SWITCHES IN, AND SPACED LONGITUDINALLY OF, SAID TUBE, EACH SAID SWITCH COMPRISING A HOUSING HAVING A LONGITUDINALLY EXTENDING CHAMBER, A PAIR OF SPACED CONTACTS AT ONE END OF SAID CHAMBER, AND A MAGNETIC BALL SLUG MOVABLE IN SAID CHAMBER TO BRIDGE SAID CONTACTS; AN ELECTRIC CIRCUIT HAVING CONNECTIONS TO SAID CONTACTS TO CLOSE SHORT CIRCUITS THERETHROUGH; A MAGNETIZED RING IN SAID ANNULAR SPACE MOVABLE LONGITUDINALLY OF SAID TUBE AND ENCIRCLING SAID
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Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3270302A (en) * 1963-09-14 1966-08-30 Int Standard Electric Corp Relay with reed contacts
US3289129A (en) * 1962-10-20 1966-11-29 Int Standard Electric Corp Push and pull key with reed contacts
US3344373A (en) * 1966-02-07 1967-09-26 Automatic Elect Lab Switching device employing a globule of magnetizable electrically conductive fluid
US3934103A (en) * 1974-06-03 1976-01-20 Texas Instruments Incorporated Liquid level sensing switch
JPS5233059A (en) * 1975-09-10 1977-03-12 Oki Electric Ind Co Ltd Switching device
JPS5234372A (en) * 1975-09-12 1977-03-16 Oki Electric Ind Co Ltd Method of driving switching device
JPS5234371A (en) * 1975-09-12 1977-03-16 Oki Electric Ind Co Ltd Switching device
WO1985005219A1 (en) * 1984-05-09 1985-11-21 Matthias Weiss Miniature toggle switch with pulse conditioner
WO2006091107A1 (en) * 2005-02-28 2006-08-31 Jan Gismervik Magnetic switch for level measurement, level meter, and use thereof
FR3016962A1 (en) * 2014-01-29 2015-07-31 Jean Paul Igougne DEVICE FOR DETECTING AND SIGNALING LEAKS IN A WATER SUPPLY NETWORK

Citations (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US684378A (en) * 1901-02-14 1901-10-08 George Westinghouse Electric lamp.
US685549A (en) * 1901-04-17 1901-10-29 George Westinghouse Electric cut-out.
US767599A (en) * 1903-09-17 1904-08-16 Charles E Sedgwick Electrically-operated apparatus.
US846624A (en) * 1905-06-27 1907-03-12 Daniel K Hickey Device to disclose opening of the shunt-circuits of electric meters.
US995414A (en) * 1910-06-17 1911-06-13 Raoul Joseph Nault Water-gage.
US1169475A (en) * 1914-03-26 1916-01-25 George P Finnigan Magnetic apparatus.
US2336101A (en) * 1938-10-04 1943-12-07 Cooperative Dev Co Well survey system
GB669932A (en) * 1949-08-15 1952-04-09 Bayham Ltd Improvements in float-operated electric switches
US2732464A (en) * 1956-01-24 Electrical contacting devices
US2802078A (en) * 1955-05-03 1957-08-06 Ibm Magnetic latch bi-stable relay
US2820865A (en) * 1955-11-04 1958-01-21 Henry H Mckinnies Electric signaling gauges
US2892051A (en) * 1956-02-20 1959-06-23 Gems Company Flow indicator
US2951135A (en) * 1958-02-24 1960-08-30 Tann Corp Magnetic snap switch

Patent Citations (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2732464A (en) * 1956-01-24 Electrical contacting devices
US684378A (en) * 1901-02-14 1901-10-08 George Westinghouse Electric lamp.
US685549A (en) * 1901-04-17 1901-10-29 George Westinghouse Electric cut-out.
US767599A (en) * 1903-09-17 1904-08-16 Charles E Sedgwick Electrically-operated apparatus.
US846624A (en) * 1905-06-27 1907-03-12 Daniel K Hickey Device to disclose opening of the shunt-circuits of electric meters.
US995414A (en) * 1910-06-17 1911-06-13 Raoul Joseph Nault Water-gage.
US1169475A (en) * 1914-03-26 1916-01-25 George P Finnigan Magnetic apparatus.
US2336101A (en) * 1938-10-04 1943-12-07 Cooperative Dev Co Well survey system
GB669932A (en) * 1949-08-15 1952-04-09 Bayham Ltd Improvements in float-operated electric switches
US2802078A (en) * 1955-05-03 1957-08-06 Ibm Magnetic latch bi-stable relay
US2820865A (en) * 1955-11-04 1958-01-21 Henry H Mckinnies Electric signaling gauges
US2892051A (en) * 1956-02-20 1959-06-23 Gems Company Flow indicator
US2951135A (en) * 1958-02-24 1960-08-30 Tann Corp Magnetic snap switch

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3289129A (en) * 1962-10-20 1966-11-29 Int Standard Electric Corp Push and pull key with reed contacts
US3270302A (en) * 1963-09-14 1966-08-30 Int Standard Electric Corp Relay with reed contacts
US3344373A (en) * 1966-02-07 1967-09-26 Automatic Elect Lab Switching device employing a globule of magnetizable electrically conductive fluid
US3934103A (en) * 1974-06-03 1976-01-20 Texas Instruments Incorporated Liquid level sensing switch
JPS5233059A (en) * 1975-09-10 1977-03-12 Oki Electric Ind Co Ltd Switching device
JPS5741055B2 (en) * 1975-09-10 1982-09-01
JPS5234371A (en) * 1975-09-12 1977-03-16 Oki Electric Ind Co Ltd Switching device
JPS5234372A (en) * 1975-09-12 1977-03-16 Oki Electric Ind Co Ltd Method of driving switching device
WO1985005219A1 (en) * 1984-05-09 1985-11-21 Matthias Weiss Miniature toggle switch with pulse conditioner
WO2006091107A1 (en) * 2005-02-28 2006-08-31 Jan Gismervik Magnetic switch for level measurement, level meter, and use thereof
NO322352B1 (en) * 2005-02-28 2006-09-18 Jan Gismervik Magnetic switch for level painting, level painting and application thereof
CN101142464B (en) * 2005-02-28 2010-08-11 J·吉斯梅维克 Magnetic switch for level measurement, level meter, and use thereof
FR3016962A1 (en) * 2014-01-29 2015-07-31 Jean Paul Igougne DEVICE FOR DETECTING AND SIGNALING LEAKS IN A WATER SUPPLY NETWORK

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