EP0160710A1 - Interrupteur à lames avec un boîtier et un bouton-poussoir - Google Patents

Interrupteur à lames avec un boîtier et un bouton-poussoir Download PDF

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Publication number
EP0160710A1
EP0160710A1 EP84104955A EP84104955A EP0160710A1 EP 0160710 A1 EP0160710 A1 EP 0160710A1 EP 84104955 A EP84104955 A EP 84104955A EP 84104955 A EP84104955 A EP 84104955A EP 0160710 A1 EP0160710 A1 EP 0160710A1
Authority
EP
European Patent Office
Prior art keywords
housing
pulse generator
contact switch
reed contact
push button
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP84104955A
Other languages
German (de)
English (en)
Other versions
EP0160710B1 (fr
Inventor
Klaus Hauk
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.)
Deere and Co
Original Assignee
Deere and Co
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Deere and Co filed Critical Deere and Co
Priority to AT84104955T priority Critical patent/ATE42428T1/de
Priority to EP84104955A priority patent/EP0160710B1/fr
Priority to DE8484104955T priority patent/DE3477862D1/de
Priority to ES542731A priority patent/ES8607610A1/es
Priority to CA000480598A priority patent/CA1235171A/fr
Priority to ZA853334A priority patent/ZA853334B/xx
Priority to JP60095870A priority patent/JPS6122525A/ja
Publication of EP0160710A1 publication Critical patent/EP0160710A1/fr
Application granted granted Critical
Publication of EP0160710B1 publication Critical patent/EP0160710B1/fr
Expired legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H13/00—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch
    • H01H13/02—Details
    • H01H13/04—Cases; Covers
    • H01H13/06—Dustproof, splashproof, drip-proof, waterproof or flameproof casings
    • 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
    • H01H36/004—Permanent magnet actuating reed switches push-button-operated, e.g. for keyboards

Definitions

  • the invention relates to a reed contact switch with a housing and a pulse generator, the housing and the pulse generator being arranged so as to be displaceable relative to one another.
  • Reed contact switches are switches with a switching element used in a glass tube serving as a contact carrier, which has two selectively connectable or separable conductor ends, which, as soon as they come into a determinable local relationship to a magnetic field, move towards or move away from each other.
  • the magnetic field is usually built up by a permanent magnet, the position of which can be changed relative to the conductor ends by means of an external force.
  • the pulse generator is movably received in the housing and emerges from it at a front end in order to be relatively shifted relative to the glass tube by means of a shift fork, a shift rod or the like to be able to.
  • a permanent magnet is attached opposite the exiting end, which can use the pulse generator to change the position of the switching element embedded in the glass tube in order to either connect or separate its conductor ends.
  • the pulse generator slides with its outer surface along the inner wall of a bore in the housing and ensures through a very precise fit that almost no dirt particles or liquid can get into a gap between the housing and the pulse generator.
  • Such a known reed contact switch can be used to control a starter circuit of an internal combustion engine for a vehicle with a transmission, which may only be put into operation when the transmission has assumed a neutral position.
  • the reed contact switch is arranged in such a way that the pulse generator is moved into its position in relation to the switching element via a switching device which is in the neutral position and thus closes the previously interrupted starter circuit.
  • the most diverse types of gearboxes mean that the reed contact switch may have to be installed at a location where it is constantly subjected to lubricating oil and abraded iron particles contained therein.
  • the pulse generator exerts a pumping action in the gap between the housing and the pulse generator due to its relative movement with respect to the housing and the glass tube, due to which lubricating oil and iron particles are sucked into the interior of the reed contact switch, which from there either cannot escape at all, as happens when the lubricating oil is exposed to low temperatures and is accordingly stiff, or which can only drain off very slowly.
  • the iron particles can collect on the outer surface of the pulse generator due to the magnetic field and completely block a sliding movement.
  • the object on which the invention is based is seen in improving such reed contact switches in such a way that their mobility is not adversely affected even with constant contact with lubricating oil and iron particles contained therein.
  • This object has been achieved according to the invention in that collecting pockets for foreign bodies are provided in the area of the sliding surface.
  • the collecting pockets are designed as grooves which allow easy entry of the foreign bodies, and in particular in that the collecting pockets are designed as longitudinal grooves incorporated in the lateral surface of the pulse generator and / or the housing, and collect them properly when one Shift takes place in the direction of the longitudinal axis. So that clogging of the collection pockets is avoided even with a low absorption capacity of the collection pockets and a large amount of foreign bodies, the collection pockets according to the invention have a passage open to the outside of the housing, so that constant drainage can take place.
  • the invention provides for a reed contact switch with a contact carrier and an inner bore provided in the pulse generator, the contact carrier and the pulse generator being relatively displaceable relative to one another between at least two end positions, in that at least one End position, the inner bore can be ventilated and / or vented, but it is also possible that the inner bore is always ventilated and / or vented, which is particularly advantageous if the sliding movement between the pulse generator and the housing is achieved even by the slightest sub - or overpressure in the reed contact switch is made impossible.
  • a reed contact switch in which the pulse generator has an actuating surface and exits the housing in an end position the ventilation is created in such a way that openings for ventilation are provided immediately below the actuating surface.
  • a reed contact switch in which the housing has an open front end and a bore emerging therefrom, in which the pulse generator is displaceably guided thereby avoided that the front end is provided with a phase and the openings for aeration and / or ventilation are connected to the phase, so that a drip edge forms at the front end, which causes the liquid to drip and prevent it from penetrating into the Reed contact switch itself largely prevents.
  • the inner bore communicates with the collecting pockets, so that foreign bodies in the collecting pockets are rinsed out of incoming liquid and released into the environment on the way through the openings for ventilation and / or ventilation can be.
  • a reed contact switch 10 has as its essential components a housing 12, a pulse generator 14, a glass tube 16 acting as a contact carrier, a switching element 18, a ring magnet 20, a base 22, contacts 24 and a compression spring 26.
  • a housing 12 a pulse generator 14
  • a glass tube 16 acting as a contact carrier
  • a switching element 18 a ring magnet 20
  • contacts 24 contacts 24
  • a compression spring 26 a compression spring 26.
  • the housing 12 is preferably made of steel and is composed of a cylindrical hollow body 28 and a hexagonal base 30. However, it is also possible to form this from a different metal or from a durable plastic. This is located at the lower end of the hollow body 28 and is formed with this as a single part. Immediately above the transition from the hexagon base 30 to the hollow body 28, a thread 32 worked on the jacket of the hollow body 28 ends, which extends from there over approximately half the length of the hollow body 28 and by means of which the reed contact switch 10 in a housing or in a Holder can be screwed in.
  • a double step step 34 provided therein and having a small diameter area 36 emerges therefrom via an outwardly opening 45 ° phase 38, the meaning of which will be explained in more detail later .
  • the stepped bore 34 also has an area of medium and an area of large diameter 40 and 42, the area of small diameter 36 taking up approximately one eighth of the length of the hollow body 28, and the area of medium diameter 40 following this connects at the bottom and extends slightly into the hexagon foot 30 and the area of large diameter 42 leads from there to the lower end of the hexagon foot 30. This results in an upper step 44 at the transition from the small 36 area to the medium diameter area 40 and a lower step 46 at the transition from the middle 40 area to the large diameter area 42.
  • the pulse generator 14 is slidably inserted into the stepped bore 34 and with a slim and wide K olbenabites 48 and 50 provided, which go respectively into the stepped bore 34 to the plant.
  • the outside diameter of the slim piston section 48 corresponds almost to the inside diameter of the stepped bore 34 in the area of the small diameter 36, while the wide piston section 50 in the outside diameter corresponds to the inside diameter of the stepped bore 34 in the area of the middle diameter 40. This dimensioning enables the pulse generator 14 to always slide along the inner wall of the stepped bore 34 between two end positions, to be adequately guided in this position and, depending on the manufacturing tolerances, to seal against it.
  • the slim piston section 48 takes up about a fifth of the total length of the pulse generator 14 and has at its upper end a spherically shaped, semicircular crest 52 as an actuating surface, below which there are a plurality of pressure compensation bores 54 into one in the pulse generator 14 arranged stepped inner or longitudinal bore 56 extend.
  • the semicircular crest 52 it is also conceivable to design the semicircular crest 52 to be largely open to the longitudinal bore 56 instead of the pressure compensation bores 54. If, however, pressure compensation bores 54 are provided, precautions must be taken to ensure that there is a connection between the longitudinal bore 56 and the surroundings of the reed contact switch at least in one end position of the pulse generator 14.
  • This longitudinal bore 56 extends from below the semicircle made of solid material to the lower end of the wide piston section 50 and is expanded in its last quarter to form a chamber 58 for receiving the ring magnet 20.
  • a chamber 58 for receiving the ring magnet 20.
  • the upper end of the pockets 60 also marks the transition between the slim and the wide piston sections 48 and 50, and a shoulder 62 resulting there can be brought into abutment against the upper step 44.
  • the pockets 60 which because of their function can be regarded as collecting pockets for foreign bodies, are thus connected to the sliding surface and collect dirt particles attached to it during the displacement process. A similar effect would also occur if the pockets were machined into the inner wall of the stepped bore 34.
  • permanent drainage to the surroundings of the reed contact switch 10 could take place by means of passages, such as slots or bores, in the housing 12, which open into the pockets 60.
  • This drainage would ultimately also be achievable in that the pockets 60 are connected to the longitudinal bore 56 and dirt particles deposited therein are flushed out via the longitudinal bore 56 and the pressure compensation bores 54 by means of the liquid acting on the reed contact switch 10.
  • the ring magnet 20 is held in the chamber 58 by means of adhesive or by means of a press fit and is flush at its lower end with the wide piston section 50. Its inside diameter corresponds to the diameter of the longitudinal bore 56 above the chamber 58.
  • the longitudinal bore 56 in turn surrounds the glass tube 16, which has an outer diameter over approximately 5/6 of its length, which likewise almost corresponds to the inner diameter of the longitudinal bore 56. Only in the area of its remaining length is it widened to approximately five times the diameter, in order thus to have an enlarged cavity 64 for receiving the To create switching element 18. This shape results in a shoulder 66 with an upper ring surface 68 on the outer surface of the glass tube 16, which comes to bear against the lower step 46.
  • the outer diameter of the glass tube 16 in the region of the cavity 64 in turn corresponds approximately to the inner diameter of the stepped bore 34 in the region of large diameter 42, so that the glass tube 16 is firmly seated in the housing 12.
  • the switching element 18 is embedded in protective gas and, to put it simply, it consists of two conductor ends 70, 72 which can be brought into contact with one another and which, as soon as the ring magnet 20 has assumed a specific position with respect to them, under the effect of this Touch acting magnetic field and thus let a current flow to a relay, not shown.
  • the conductor ends 70, 72 open into the base 22, from where they are connected to a correspondingly constructed circuit, also not shown, via the contacts 24, which are poured into the stepped bore 34 in the bleach of large diameter 42 and into the cavity 64 can be.
  • the compression spring 26 is located between the lower end of the pulse generator 14 and the upper ring surface 68 of the glass tube 16 in order to exert a force directed away from the glass tube 16 on the pulse generator 14.
  • the glass tube 16, the housing 12, the base 22 and the switching element 18 together form a rigid unit, with respect to which only the pulse generator 14 and the ring magnet 20 are movably arranged under the action of the compression spring 26. The movement takes place in the direction of the central longitudinal center axis of the reed contact switch 10.
  • the pulse generator 14 protrudes with its tip 52 out of the housing 12 and can thus move from outside inducing force, which can optionally be introduced via a shift fork, a shift rod, a lever, a pedal or many other things. Due to the compression spring 26 at one end and the system of paragraph 62 at the upper stage 44 at the other end, the pulse generator 14 can only execute a small stroke between an upper and a lower end position, which is usually only so large that when the Compression spring 26 sits on block, the dome 52 still protrudes over the housing 12.
  • the switching element 18 is closed or opened due to the position of the magnetic field built up within the ring magnet 20 relative to the conductor ends 70, 72.
  • This reed contact switch 10 is used in the control of a starter circuit of an internal combustion engine for a tractor with a transmission, which for safety reasons should only be started via an electric starter when the transmission has assumed a neutral position.
  • the ring magnet 20 with the pulse generator 14 should assume a position which causes the switching element 18 to be open and thus a current flow from an ignition lock to the electrical starter cannot take place.
  • a cam is placed on a decisive shift rod, which pushes the pulse generator 14 into the housing 12 as long as the shift rod is in a neutral position. In this position, the switching element 18 is closed and the internal combustion engine can be started.
  • the installation of the reed contact switch 10 in a transmission also results in it being exposed to lubricating oil and abraded iron particles contained therein. Due to the relative movement of the pulse generator 14 with respect to the glass tube 16 and the housing 12 and the gaps between these still existing, however small, a pump effect arises with each stroke of the pulse generator 14, due to which lubricating oil is sucked into the gap with the iron particles and other deposits mentioned. In order to prevent this lubricating oil from being trapped between the glass tube 16 and the upper end of the longitudinal bore 56, the pressure compensation bores 54 are provided through which the lubricating oil which has entered can be pumped out again.
  • the 45 ° phase 38 at the upper end of the housing 12 results in a drip edge which, when the reed contact switch 10 is installed horizontally or at an angle, causes the lubricating oil to drip off, thus making its penetration into the gaps almost impossible. Nevertheless, iron particles which have penetrated into the gap between the pulse generator 14 and the housing 12 settle in the pockets 60 and do not get into the gap between the wide piston section 50 in the region of the chamber 58 and the stepped bore 34 in the region of medium diameter 40, so that there blocking of the sliding movement of the pulse generator 14 is prevented.

Landscapes

  • Switches That Are Operated By Magnetic Or Electric Fields (AREA)
  • Push-Button Switches (AREA)
  • Brushes (AREA)
  • Keying Circuit Devices (AREA)
  • Manufacture Of Switches (AREA)
EP84104955A 1984-05-03 1984-05-03 Interrupteur à lames avec un boîtier et un bouton-poussoir Expired EP0160710B1 (fr)

Priority Applications (7)

Application Number Priority Date Filing Date Title
AT84104955T ATE42428T1 (de) 1984-05-03 1984-05-03 Reedkontaktschalter mit einem gehaeuse und einem impulsgeber.
EP84104955A EP0160710B1 (fr) 1984-05-03 1984-05-03 Interrupteur à lames avec un boîtier et un bouton-poussoir
DE8484104955T DE3477862D1 (en) 1984-05-03 1984-05-03 Reed switch with a housing and a push button
ES542731A ES8607610A1 (es) 1984-05-03 1985-04-30 Interruptor de contacto reed
CA000480598A CA1235171A (fr) 1984-05-03 1985-05-02 Commutateur a anche avec boitier et generateur d'impulsions
ZA853334A ZA853334B (en) 1984-05-03 1985-05-03 Reed contact switch comprising a housing and a pulse generator
JP60095870A JPS6122525A (ja) 1984-05-03 1985-05-04 異物粒子収集ポケツトを備えるリ−ドスイツチ

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP84104955A EP0160710B1 (fr) 1984-05-03 1984-05-03 Interrupteur à lames avec un boîtier et un bouton-poussoir

Publications (2)

Publication Number Publication Date
EP0160710A1 true EP0160710A1 (fr) 1985-11-13
EP0160710B1 EP0160710B1 (fr) 1989-04-19

Family

ID=8191916

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84104955A Expired EP0160710B1 (fr) 1984-05-03 1984-05-03 Interrupteur à lames avec un boîtier et un bouton-poussoir

Country Status (7)

Country Link
EP (1) EP0160710B1 (fr)
JP (1) JPS6122525A (fr)
AT (1) ATE42428T1 (fr)
CA (1) CA1235171A (fr)
DE (1) DE3477862D1 (fr)
ES (1) ES8607610A1 (fr)
ZA (1) ZA853334B (fr)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1557578A (fr) * 1967-04-22 1969-02-14
FR1574161A (fr) * 1968-05-16 1969-07-11
DE1515675A1 (de) * 1965-08-02 1969-08-14 Elektrosteuerung Rudolf Dinneb OEl-,feuchtigkeits- und staubdichte Tasteneinheit
US3613041A (en) * 1969-12-15 1971-10-12 Kysor Industrial Corp Thermal-responsive switch
US3622926A (en) * 1970-03-12 1971-11-23 George Risk Magnetically actuatable reed switch assembly
US3717737A (en) * 1970-07-04 1973-02-20 Alps Electric Co Ltd Resilient omnidirectional push-button for an electrical switch

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3421124A (en) * 1967-03-17 1969-01-07 Joseph V Kidd Detector switch

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1515675A1 (de) * 1965-08-02 1969-08-14 Elektrosteuerung Rudolf Dinneb OEl-,feuchtigkeits- und staubdichte Tasteneinheit
FR1557578A (fr) * 1967-04-22 1969-02-14
FR1574161A (fr) * 1968-05-16 1969-07-11
US3613041A (en) * 1969-12-15 1971-10-12 Kysor Industrial Corp Thermal-responsive switch
US3622926A (en) * 1970-03-12 1971-11-23 George Risk Magnetically actuatable reed switch assembly
US3717737A (en) * 1970-07-04 1973-02-20 Alps Electric Co Ltd Resilient omnidirectional push-button for an electrical switch

Also Published As

Publication number Publication date
CA1235171A (fr) 1988-04-12
ES542731A0 (es) 1986-05-16
ES8607610A1 (es) 1986-05-16
EP0160710B1 (fr) 1989-04-19
DE3477862D1 (en) 1989-05-24
ATE42428T1 (de) 1989-05-15
ZA853334B (en) 1987-01-28
JPS6122525A (ja) 1986-01-31

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