US3882337A - Hall plate contact-less operator and method of its adjustment - Google Patents

Hall plate contact-less operator and method of its adjustment Download PDF

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Publication number
US3882337A
US3882337A US415335A US41533573A US3882337A US 3882337 A US3882337 A US 3882337A US 415335 A US415335 A US 415335A US 41533573 A US41533573 A US 41533573A US 3882337 A US3882337 A US 3882337A
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United States
Prior art keywords
pushrod
housing
magnet
operator
hall generator
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Expired - Lifetime
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US415335A
Inventor
Josef Pfeffer
Horst Schwable
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Rafi Raimund Finsterholzl Elektrotechnische Spezialfabrik
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Rafi Raimund Finsterholzl Elektrotechnische Spezialfabrik
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    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
    • H03K17/51—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used
    • H03K17/90—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used by the use, as active elements, of galvano-magnetic devices, e.g. Hall-effect devices
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S310/00—Electrical generator or motor structure
    • Y10S310/03—Hall effect generators and converters
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49002—Electrical device making
    • Y10T29/49004—Electrical device making including measuring or testing of device or component part
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49002—Electrical device making
    • Y10T29/4902—Electromagnet, transformer or inductor
    • Y10T29/49075—Electromagnet, transformer or inductor including permanent magnet or core

Definitions

  • a Hall generator is carried in a plate.
  • a pushrod member with a permanent magnet is arranged displaceable relative to the Hall gener- Int. Cl. H02k 35/02 mm against the force of a p g 2 Claims, 2 Drawing Figures I fi j I? /i; I] a e 1/ SHEET 2 OF 2 PHENTEBMAY 619? HALL PLATE CONTACT-LESS OPERATOR AND METHOD OF ITS ADJUSTMENT CROSS-REFERENCE TO RELATED APPLICATIONS
  • German Appli cation No. P 2.2563606. filed Nov. l7. I972.
  • the invention relates generally to a contact-less operator or switch using a permanent magnet. and particularly to such an operator or switch for a pathresponsive control of switching. whereby a permanent magnet is moved relatively to a member which is sensitive to magnetic forces for production of electronic control pulses.
  • one object of the present invention to provide a new type of a contact-less operator or switch. which has the characteristics ofthe known contact-less switches and beyond that also which fulfills the last mentioned conditions by making use of a Hall generator. which. in the normal condition of the operator. is outside the air gap of a permanent magnet. but which is between two pole surfaces of the magnet in the air gap after the displacement of the magnet against the force of a spring.
  • FIG. I is a side view in partial cross-section of an operator according to the present invention.
  • FIG. 2 is a simplified diagram for explaining the method of adjusting the magnetic force of the permanent magnet in said operator.
  • the contact-less operator shown in FIG. 1 as side view in partial cross-section comprises a housing I with an end member 2 and a pushrod member 4, which is displaceable in the housing I in the directions indicated by the arrow 3, and which is integral with a pushrod 5.
  • the pushrod 5 carries a removable operating button 6.
  • the pushrod member 4 incorporates an annular permanent magnet 7 which is indicated in the drawing by dash-dot lines.
  • the magnet 7 has an air gap 9, the surfaces of the magnet 7 which define the air gap 9 and which represent the poles being parallel to the direc-" tion of the arrow 3.
  • the pushrod member 4 has guide surfaces (not shown) on its outside which co-operate with guide surfaces (not shown) on the inside wall of the housing I to guide the pushrod member 4 parallel to a plane of symmetry of the magnet 7.
  • the end member 2 of the housing I carries holders 10 which project into the interior of the housing I and between which is positioned a plate [I which comprises a Hall generator.
  • the center portion of the bracket I2 On its side remote from the Hall generator. the center portion of the bracket I2 also carries a projecting pin (not shown) for centering a coil spring 15.
  • the spring 15 extends into the central space of the magnet 7 within a passage which extends into the pushrod member 4 parallel to the direction of the arrow 3.
  • the bracket I2 with its resilient limb portions I3 and the pin for centering the spring I5 is made in one piece from injection-molded plastics material.
  • the magnet 7 is also fixed by injection molding in the pushrod member 4, which comprises plastics material.
  • IC-chip Disposed in the interior of the plate I]. besides the Hall generator, are also other electronic components which form a so-called integrated-circuit or IC-chip.
  • contact terminals 16 In the underside of the plate II are contact terminals 16 for connecting the IC-chip to associated external current sources and other external switching components which are to be controlled by the above-described eontact-less operator.
  • the contact less operator can be so constructed as to be either actuating or arresting. and either illuminated or unilluminated.
  • FIG. 2 shows an arrangement for such precise magnetic adjustment.
  • the assembled operator with housing I and operating button 6 is then brought into the field of a coil which is fed with alternating current from a control unit 21 which is energized from a power supply 22.
  • the coil 20 is used to permanently partially demagnetize the magnet.
  • the operating button 6. together with pushrod S and attached magnet 7 (not shown in H6. 2).
  • the permanent magnet 7 is progressively and permanently de-magnetised by the alternating current field of the coil 20, until the transistor switch. which is connected to the Hall generator and which is linked by adapter 23 to a corresponding current source and a measuring device 24, switches over from one operating condition to the other. If, when this switch-over occurs, a switch is actuated to interrupt the flow of current through the coil. Adjust is effected automatically.
  • buttons 6 A precise displacement of button 6 can easily be achieved by means of a motor 25, associated gear (not shown) and a cam 26 which moves rod 17 in direction of arrow 28.
  • the control unit 21 is operated from the operating desk 29.
  • the above described method may also be slightly modified. Let us assume that the operator should switch after the button has been displaced by 2 mm, but that it switches after a displacement of only l mm mm and a pulse is delivered through adapter 23 to the control unit 21. Now from the control unit there is delivcred an alternating current to coil 21. The intensity of this demagnetising alternating current, in this modification. is controlled by the control unit 21 in relation to the angular position of the cam, and also the demagnetising time is controlled by the control unit. In this way it is possible to weaken the magnetic force of the permanent magnet of the operator to such an extend that the operator switches precisely after the desired displacement of eg, 2 mm.
  • a contact-less operator comprising: a housing, a Hall generator, a plate which carries said Hall generator and is disposed in said housing, a permanent magnet having pole surfaces defining an air gap, a pushrod member carrying said magnet and disposed in said housing.
  • the operator further comprising a retaining loop bracket having a central portion and two resilient limb portions projecting therefrom provided with inwardly projecting portions which engage behind corresponding projections on holders extending inwardly from an end member of the housing, said plate being held between said central portion and said end member.

Landscapes

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

Abstract

In a contact-less operator, a Hall generator is carried in a plate. A pushrod member with a permanent magnet is arranged displaceable relative to the Hall generator against the force of a spring.

Description

Unlted States Patent 1 1 1111 3,882,337
Pfeffer et a1. May 6, 1975 1 1 HALL PLATE CONTACT-LESS OPERATOR [58] Field 01 Search 310/D1G. 3; 340/365 L, AND METHOD OF ITS ADJUSTMENT 340/174 HA. 174 338/32 29/593. [75] Inventors: Josef Pfeffer, Amtszell; Horst 607; 318/138 317/1575 PM; :2
Schwiible, both of Obermelsungen, Germany 156] References Cited [73] Assignee: Rafi Raimund Finsterholzl UNITED STATES PATENTS E'ekmtechm spemlfabrk 3,235.776 2/1966 lreland 324/45 x Ravensburg-vfirbfirg- Germany 3340.467 9/1967 Whan Ha 1. 324/45 x 3,596.144 7/1971 Cunningham 77777777777 1. 317/1575 PM 1221 1973 3,611,358 10/1971 Dalmasso .1 340/265 L [21] Appl. No.: 415,335
Primary ExaminerMark O. Budd Attorney, Agent, or Firm-Littlepage Quaintance. [30] Foreign Appllcatlon Pnonty Data p y & Dobyns Nov, 17, 1972 Germany 1. 2256360 [57] ABSTRACT [52] US. Cl... 310/273; 310/D1G. 3; 317/1575 PM;
In a contact-less operator, a Hall generator is carried in a plate. A pushrod member with a permanent magnet is arranged displaceable relative to the Hall gener- Int. Cl. H02k 35/02 mm against the force of a p g 2 Claims, 2 Drawing Figures I fi j I? /i; I] a e 1/ SHEET 2 OF 2 PHENTEBMAY 619? HALL PLATE CONTACT-LESS OPERATOR AND METHOD OF ITS ADJUSTMENT CROSS-REFERENCE TO RELATED APPLICATIONS This application claims priority from German Appli cation No. P 2.2563606. filed Nov. l7. I972.
BACKGROUND OF THE INVENTION The invention relates generally to a contact-less operator or switch using a permanent magnet. and particularly to such an operator or switch for a pathresponsive control of switching. whereby a permanent magnet is moved relatively to a member which is sensitive to magnetic forces for production of electronic control pulses.
It is known to arrange one or a plurality of currentfed field plates within the housing of a switch. together with one or a plurality of magnets. relative movable toward each other.
It is known that such contact-less switches. compared with such switches having mechanical contacts. have particularly advantageous characteristics. essentially chatter-free contact performance. long life. a transfer characteristic which remains constant resistance. to humidity and vibration. a high number of switching actuations in its life expectancy and low operating force.
These characteristics are particularly important in switches. whereby the following additional conditions are set: Reproduceability of the switching point. high switching exactness. and a switching speed which is independent of the operation of the switching-pushrod.
SUMMARY OF THE INVENTION It is. therefore. one object of the present invention to provide a new type of a contact-less operator or switch. which has the characteristics ofthe known contact-less switches and beyond that also which fulfills the last mentioned conditions by making use of a Hall generator. which. in the normal condition of the operator. is outside the air gap of a permanent magnet. but which is between two pole surfaces of the magnet in the air gap after the displacement of the magnet against the force of a spring.
It is another object of the present invention. to provide a new method of adjusting the magnetic force of the contact-less operator by means of a demagnetizing coil.
It is a still further object of the invention to provide an automatic control of said demagnetizing coil by means of an electric pulse delivered by the operator when it is moved from one position into its other position.
With this principle it is possible. to fulfill the mentioned requirements. whereby depending upon the prevailing special structural and functional conditions. an embodiment of a contact-less operator and an apparatus for automatic control or adjustment of the magnetic force of the permanent magnet in said operator according to the present invention are provided.
BRIEF DESCRIPTION OF THE DRAWING With these and other objects in view which will become apparent in the following detailed description. the present invention. which is disclosed by example only. will be clearly understood in connection with the accompanying drawings. in which:
FIG. I is a side view in partial cross-section of an operator according to the present invention.
FIG. 2 is a simplified diagram for explaining the method of adjusting the magnetic force of the permanent magnet in said operator.
DESCRIPTION OF A PREFERRED EMBODIMENT The contact-less operator shown in FIG. 1 as side view in partial cross-section comprises a housing I with an end member 2 and a pushrod member 4, which is displaceable in the housing I in the directions indicated by the arrow 3, and which is integral with a pushrod 5. The pushrod 5 carries a removable operating button 6.
The pushrod member 4 incorporates an annular permanent magnet 7 which is indicated in the drawing by dash-dot lines. The magnet 7 has an air gap 9, the surfaces of the magnet 7 which define the air gap 9 and which represent the poles being parallel to the direc-" tion of the arrow 3. The pushrod member 4 has guide surfaces (not shown) on its outside which co-operate with guide surfaces (not shown) on the inside wall of the housing I to guide the pushrod member 4 parallel to a plane of symmetry of the magnet 7.
The end member 2 of the housing I carries holders 10 which project into the interior of the housing I and between which is positioned a plate [I which comprises a Hall generator.
A retaining loop bracket I2 with resilient limb portions 13 provided with inwardly projecting portions which engage behind corresponding projections on the holders 10. holds the plate 11 with the Hall generator in position relative to the end member 2 and thus relative to the housing I. On its side remote from the Hall generator. the center portion of the bracket I2 also carries a projecting pin (not shown) for centering a coil spring 15. The spring 15 extends into the central space of the magnet 7 within a passage which extends into the pushrod member 4 parallel to the direction of the arrow 3.
The bracket I2 with its resilient limb portions I3 and the pin for centering the spring I5 is made in one piece from injection-molded plastics material. The magnet 7 is also fixed by injection molding in the pushrod member 4, which comprises plastics material.
Disposed in the interior of the plate I]. besides the Hall generator, are also other electronic components which form a so-called integrated-circuit or IC-chip. In the underside of the plate II are contact terminals 16 for connecting the IC-chip to associated external current sources and other external switching components which are to be controlled by the above-described eontact-less operator.
When the button 6 is moved. the magnet 7 is displaced relative to the Hall generator. The Hall voltage which is produced by the magnetic field is amplified and controls a Schmitt trigger. the output signal of which passes by way of two equal-phase transistor outputs with open collector. to the output. By means of a voltage regular which also forms part of the IC-chip. it is possible for the operator to be used in a voltage range of from +4.5 volts to 30 volts.
The contact less operator can be so constructed as to be either actuating or arresting. and either illuminated or unilluminated.
A particular advantage of the above-described construction of the operator is that. after the operator has been assembled. which assembly is very simple. precise magnetic adjustment is possible. FIG. 2 shows an arrangement for such precise magnetic adjustment. First the operator is assembled using a permanent magnet which is too strong for the switch in which it is to be used. The assembled operator with housing I and operating button 6 is then brought into the field of a coil which is fed with alternating current from a control unit 21 which is energized from a power supply 22. The coil 20 is used to permanently partially demagnetize the magnet. The operating button 6. together with pushrod S and attached magnet 7 (not shown in H6. 2). is displaced into the required switching point position, and then the permanent magnet 7 is progressively and permanently de-magnetised by the alternating current field of the coil 20, until the transistor switch. which is connected to the Hall generator and which is linked by adapter 23 to a corresponding current source and a measuring device 24, switches over from one operating condition to the other. If, when this switch-over occurs, a switch is actuated to interrupt the flow of current through the coil. adjustment is effected automatically.
A precise displacement of button 6 can easily be achieved by means of a motor 25, associated gear (not shown) and a cam 26 which moves rod 17 in direction of arrow 28. The control unit 21 is operated from the operating desk 29.
The above described method may also be slightly modified. Let us assume that the operator should switch after the button has been displaced by 2 mm, but that it switches after a displacement of only l mm mm and a pulse is delivered through adapter 23 to the control unit 21. Now from the control unit there is delivcred an alternating current to coil 21. The intensity of this demagnetising alternating current, in this modification. is controlled by the control unit 21 in relation to the angular position of the cam, and also the demagnetising time is controlled by the control unit. In this way it is possible to weaken the magnetic force of the permanent magnet of the operator to such an extend that the operator switches precisely after the desired displacement of eg, 2 mm.
Both above described procedures have the advantage that permanent magnets with greater tolerance in field strength can be used. By adjusting the switching point with a demagnetising electrical alternating current field. it is possible to adjust magnetically a large number of individual operators to the same switching point, and thereby to provide the necessary condition for the mass production of precision operators with relatively inexpensive components.
Many possible modifications will become apparent from the foregoing without departing from the spirit of the present invention. However, the foregoing disclosure is presented in an illustrative sense rather than a limiting sense and the appended claims are relied upon to define the scope of the present invention.
We claim:
I. A contact-less operator comprising: a housing, a Hall generator, a plate which carries said Hall generator and is disposed in said housing, a permanent magnet having pole surfaces defining an air gap, a pushrod member carrying said magnet and disposed in said housing. means for displacing said pushrod member from outside said housing, and a spring disposed in said housing and acting on said pushrod member to bias said pushrod member to a position in which said Hall generator is outside said air gap of said magnet. displacement of said pushrod member by said means bringing said magnet to a position in which said Hall generator is between said pole surfaces, wherein said magnet is in the interior of said pushrod member, and the displacing means comprises: 7
A. a pushrod integrally connected to said pushrod member, and
B. an operating button on said pushrod outside said housing,
the operator further comprising a retaining loop bracket having a central portion and two resilient limb portions projecting therefrom provided with inwardly projecting portions which engage behind corresponding projections on holders extending inwardly from an end member of the housing, said plate being held between said central portion and said end member.
2. An operator according to claim 1 wherein said central portion carries on its side remote from said plate a projecting pin for centering said spring.

Claims (2)

1. A contact-less operator comprising: a housing, a Hall generator, a plate which carries said Hall generator and is disposed in said housing, a permanent magnet having pole surfaces defining an air gap, a pushrod member carrying said magnet and disposed in said housing, means for displacing said pushrod member from outside said housing, and a spring disposed in said housing and acting on said pushrod member to bias said pushrod member to a position in which said Hall generator is outside said air gap of said magnet, displacement of said pushrod member by said means bringing said magnet to a position in which said Hall generator is between said pole surfaces, wherein said magnet is in the interior of said pushrod member, and the displacing means comprises: A. a pushrod integrally connected to said pushrod member, and B. an operating button on said pushrod outside said housing, the operator further comprising a retaining loop bracket having a central portion and two resilient limb portions projecting therefrom provided with inwardly projecting portions which engage behind corresponding projections on holders extending inwardly from an end member of the housing, said plate being held between said central portion and said end member.
2. An operator according to claim 1 wherein said central portion carries on its side remote from said plate a projecting pin for centering said spring.
US415335A 1972-11-17 1973-11-13 Hall plate contact-less operator and method of its adjustment Expired - Lifetime US3882337A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2256360A DE2256360A1 (en) 1972-11-17 1972-11-17 CONTACTLESS BUTTON AND SWITCH

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US3882337A true US3882337A (en) 1975-05-06

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JP (1) JPS49133878A (en)
DE (1) DE2256360A1 (en)
FR (1) FR2207393B1 (en)
GB (1) GB1421056A (en)

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2316977A1 (en) * 1975-07-07 1977-02-04 Repa Feinstanzwerk Gmbh EMERGENCY LOCKING DEVICE FOR SEAT BELT REELS
US4107604A (en) * 1976-12-01 1978-08-15 Compunetics, Incorporated Hall effect displacement transducer using a bar magnet parallel to the plane of the Hall device
US4188605A (en) * 1978-07-21 1980-02-12 Stout Glenn M Encapsulated Hall effect device
US4307617A (en) * 1980-05-12 1981-12-29 Honeywell Inc. Indicating and control apparatus utilizing Hall effect elements
US4359719A (en) * 1980-10-06 1982-11-16 Honeywell Inc. Hall effect alarm pull station
US4489303A (en) * 1983-06-03 1984-12-18 Advanced Control Systems Contactless switch and joystick controller using Hall elements
US5491740A (en) * 1993-10-27 1996-02-13 Activator Systems, Inc. Automated key actuating cellular telephone programmer
EP0870653A1 (en) * 1997-04-11 1998-10-14 TAKATA (EUROPE) VEHICLE SAFETY TECHNOLOGY GmbH Belt buckle
US6097272A (en) * 1998-11-17 2000-08-01 Korry Electronics Co. Contactless switch
EP1152441A1 (en) * 1999-11-10 2001-11-07 Idec Izumi Corporation Electric part, and emergency stop system and communication device having the same
US6612404B2 (en) * 2001-05-25 2003-09-02 Thyssen Elevator Capital Corp. Contactless hall effect push button switch
US6867680B1 (en) * 2000-06-30 2005-03-15 Otto Controls Division, Otto Engineering, Inc Dual magnet hall effect switch
ES2351138A1 (en) * 2010-05-18 2011-02-01 Viva Developments S.L. Electromechanical generator cell and process for obtaining the same
CN104883025A (en) * 2015-06-12 2015-09-02 武汉领普科技有限公司 Self-resetting generating device and switch

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US4505092A (en) * 1982-04-26 1985-03-19 Hobart Corporation Package sensing/film control system for film wrapping machine
DE3611579C1 (en) * 1986-04-07 1987-12-10 Kloeckner Moeller Elektrizit Electronic switching apparatus
DE19514708C1 (en) * 1995-04-21 1996-08-08 Kostal Leopold Gmbh & Co Kg Rotationally symmetric electric switch influenced by permanent magnets
TW201426252A (en) * 2012-12-27 2014-07-01 Hon Hai Prec Ind Co Ltd Waterproof electronic device and its magnetic sensing switch

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US3235776A (en) * 1961-07-31 1966-02-15 Indiana General Corp Permanent magnet stabilizer system and method
US3340467A (en) * 1964-06-23 1967-09-05 Beckman Instruments Inc Magnetic metal detector utilizing a magnetic bridge formed with permanent magnets and a hall effect sensor
US3596144A (en) * 1968-10-31 1971-07-27 Bell Inc F W Automatic magnet charger and calibration system
US3611358A (en) * 1968-01-22 1971-10-05 Olivetti & Co Spa Hall effect keyboard

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US3560805A (en) * 1968-07-12 1971-02-02 Rfl Ind Inc Apparatus for treating permanent magnets
DE7024643U (en) * 1970-07-01 1971-01-28 Rafi Raimund Finsterholzl, Elektro technische Spezialfabnk, 7980 Ravens burg BUILT-IN BUTTONS FOR ELECTRONIC DEVICES
JPS5043096Y2 (en) * 1971-02-22 1975-12-09

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Publication number Priority date Publication date Assignee Title
US3235776A (en) * 1961-07-31 1966-02-15 Indiana General Corp Permanent magnet stabilizer system and method
US3340467A (en) * 1964-06-23 1967-09-05 Beckman Instruments Inc Magnetic metal detector utilizing a magnetic bridge formed with permanent magnets and a hall effect sensor
US3611358A (en) * 1968-01-22 1971-10-05 Olivetti & Co Spa Hall effect keyboard
US3596144A (en) * 1968-10-31 1971-07-27 Bell Inc F W Automatic magnet charger and calibration system

Cited By (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2316977A1 (en) * 1975-07-07 1977-02-04 Repa Feinstanzwerk Gmbh EMERGENCY LOCKING DEVICE FOR SEAT BELT REELS
US4103842A (en) * 1975-07-07 1978-08-01 Repa Feinstanzwerk Gmbh Locking sensor for belt retractor
US4107604A (en) * 1976-12-01 1978-08-15 Compunetics, Incorporated Hall effect displacement transducer using a bar magnet parallel to the plane of the Hall device
US4188605A (en) * 1978-07-21 1980-02-12 Stout Glenn M Encapsulated Hall effect device
US4307617A (en) * 1980-05-12 1981-12-29 Honeywell Inc. Indicating and control apparatus utilizing Hall effect elements
US4359719A (en) * 1980-10-06 1982-11-16 Honeywell Inc. Hall effect alarm pull station
US4489303A (en) * 1983-06-03 1984-12-18 Advanced Control Systems Contactless switch and joystick controller using Hall elements
US5491740A (en) * 1993-10-27 1996-02-13 Activator Systems, Inc. Automated key actuating cellular telephone programmer
EP0870653A1 (en) * 1997-04-11 1998-10-14 TAKATA (EUROPE) VEHICLE SAFETY TECHNOLOGY GmbH Belt buckle
US6076239A (en) * 1997-04-11 2000-06-20 Takata (Europe) Vehicle Safety Technology Gmbh Seat belt buckle with slide sensor
US6097272A (en) * 1998-11-17 2000-08-01 Korry Electronics Co. Contactless switch
EP1152441A1 (en) * 1999-11-10 2001-11-07 Idec Izumi Corporation Electric part, and emergency stop system and communication device having the same
EP1152441A4 (en) * 1999-11-10 2003-09-03 Idec Izumi Corp Electric part, and emergency stop system and communication device having the same
US6842123B1 (en) 1999-11-10 2005-01-11 Idec Izumi Corporation Electromechanical switching device and emergency shut-off and communication system utilizing same
US6867680B1 (en) * 2000-06-30 2005-03-15 Otto Controls Division, Otto Engineering, Inc Dual magnet hall effect switch
US6612404B2 (en) * 2001-05-25 2003-09-02 Thyssen Elevator Capital Corp. Contactless hall effect push button switch
US20040104080A1 (en) * 2001-05-25 2004-06-03 Sweet Robert H. Contactless hall effect push button switch
US6854566B2 (en) * 2001-05-25 2005-02-15 Thyssenkrupp Elevator Capital Corp. Contactless push button switch comprising a hall effect transducer and microprocessor
ES2351138A1 (en) * 2010-05-18 2011-02-01 Viva Developments S.L. Electromechanical generator cell and process for obtaining the same
CN104883025A (en) * 2015-06-12 2015-09-02 武汉领普科技有限公司 Self-resetting generating device and switch
CN104883025B (en) * 2015-06-12 2019-08-20 武汉领普科技有限公司 Self-resetting power generator and switch

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GB1421056A (en) 1976-01-14
FR2207393A1 (en) 1974-06-14
FR2207393B1 (en) 1979-03-23
JPS49133878A (en) 1974-12-23
DE2256360A1 (en) 1974-05-22

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