EP0440857A1 - Méthode et dispositif pour ouvrir les contacts dans des minuteries employants des disques rotatifs - Google Patents

Méthode et dispositif pour ouvrir les contacts dans des minuteries employants des disques rotatifs Download PDF

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Publication number
EP0440857A1
EP0440857A1 EP90102474A EP90102474A EP0440857A1 EP 0440857 A1 EP0440857 A1 EP 0440857A1 EP 90102474 A EP90102474 A EP 90102474A EP 90102474 A EP90102474 A EP 90102474A EP 0440857 A1 EP0440857 A1 EP 0440857A1
Authority
EP
European Patent Office
Prior art keywords
movable contact
contact
lever
inclined surface
transit
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.)
Withdrawn
Application number
EP90102474A
Other languages
German (de)
English (en)
Inventor
Virgilio De Biasi
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.)
Eaton Controls SpA
Original Assignee
Eaton Controls SpA
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 Eaton Controls SpA filed Critical Eaton Controls SpA
Priority to EP90102474A priority Critical patent/EP0440857A1/fr
Publication of EP0440857A1 publication Critical patent/EP0440857A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H43/00—Time or time-programme switches providing a choice of time-intervals for executing one or more switching actions and automatically terminating their operations after the programme is completed
    • H01H43/02—Details
    • H01H43/026—Contact arrangements
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H3/00—Mechanisms for operating contacts
    • H01H3/001—Means for preventing or breaking contact-welding

Definitions

  • This invention concerns a method and a device to free contacts in timers employing rotary disks.
  • the invention is to be applied in electromechanical timers including a plurality of rotary disks the circumferential periphery of which is shaped in a programmed manner.
  • Timers of this kind are employed in washing machines, dishwashers, etc. to govern in a programmed and programmable manner all the functions of such apparatus.
  • the invention concerns particularly the timers indicated above which include a lever between the rotary programmer disk and a movable contact (see Figs.2 and 3 for instance).
  • the invention therefore does not concern the timers which comprise a rocker lever of the type shown in Fig.1, for instance, between the rotary programmer disk and the movable contact.
  • the rotation of the programmer disks defines two or more positions, normally two or three, of a movable contact.
  • the contacts serve to transmit electrical control or power signals according to required logics so as to actuate specific functions in a desired way within desired times.
  • a movable contact can take up two positions, one of those positions will undoubtedly cooperate with a stationary contact, while the other position may cooperate with another contact or provide for a mere disconnection.
  • a movable contact can take up three positions, then the two outer positions normally cooperate with as many stationary contacts, while the middle position normally provides for disconnection.
  • the movable contact normally consists of a shaft which at one end is always engaged with a source of signals, while its other end can take up the aforesaid positions.
  • This lengthwise traversing movement causes sliding of the movable contact on the stationary contact with which it is always engaged, and this sliding eliminates the opacity and improves electrical contact.
  • the problem of adherence of the contacts to each other has for some time become important owing to the frequency of the cycles and to the electrical charge which designers apply more and more to each electrical circuit.
  • the rocker solution provides a rocker contact 120 acting between a common contact 24 and first 25 and second 26 transit contacts.
  • the rocker contact 120 is actuated by a rotary programmer disk 23 by means of a feeler element 35 of a rocker lever 321, which can oscillate about a rotation pivot 22.
  • Spring means 27 are included between the rocker lever 321 and rocker contact 120. If the rocker contact 120 adheres to the first transit contact 25, for instance, the rocker lever 321 rests, as shown in Fig.1, on the rocker contact 120 and frees it with a contrast tooth 28.
  • a lever 121 with a rotation pivot 22 and feeler element 35 cooperates with a rotary programmer disk 23.
  • a movable contact 20 is displaced with a lengthwise traversing movement 30 and a lateral traversing movement 29.
  • a contrast rod 37 intervenes and detaches the element B from the first transit contact 25.
  • This embodiment is excellent in itself but entails the drawback that the contrast rod 37 has to be well positioned geometrically in relation to the contrast tooth 28.
  • the action of the spring 27 owing to its geometric position is such that it imparts to the lever 121/movable contact 20 under normal conditions a lateral traversing movement 29 and a lengthwise traversing movement 30.
  • An L-shaped lever 32 pivoted at 31 has been applied in the embodiment of Fig.3 and cooperates with a seating 36 included in the main lever 221.
  • the seating 36 actuates a second arm 34 of the L-shaped lever 32, and the second arm 34 causes the L-shaped lever 32 to rotate on its pivot 31.
  • the L-shaped lever 32 exerts by means of its first arm 33 a mechanical action sufficient to break the adherence, and when the adherence of the element B to the first transit contact 25 has been broken, then the system works normally.
  • a first set of problems is of a mechanical type, for the L-shaped arms of the lever 32 may break in the event of repeated stresses in view of the small dimensions of the L-­shaped lever itself 32.
  • a second set of problems is of an economical type and is linked to problems of procurement, storage, transport and installation of the L-shaped lever itself 32. These problems of an economical type affect the cost of a timer assembly by between a hundred and fiftieth and a sixtieth.
  • a movable contact 20 is made to cooperate with a first inclined surface 38 and a second inclined surface 39 which are differently inclined at angles " ⁇ " and " ⁇ " respectively.
  • the first inclined surface 38 is stationary and has an ascending slope with an angle of inclination " ⁇ " which is greater than the angle of inclination " ⁇ " of the second inclined surface 39. This means that, given an equal movement of the movable contact 20 towards the first inclined surface 38 and second inclined surface 39 respectively, the first inclined surface 38 induces in the movable contact 20 a greater lateral displacement than that induced in the movable contact 20 by the second inclined surface 39.
  • the second inclined surface 39 is machined on the lever 21.
  • the first inclined surface 38 may be obtained by being moulded on a support of the contacts or may consist of an additional element or of an element to transfer electricity from one contact to another.
  • the first inclined surface 38 cooperates with the movement of the movable contact 20, accentuates the lengthwise transversing movement of that contact 20 and frees it from its connection to the second inclined surface 39 on the lever 21.
  • the lever 21 overcomes the resilient resistance of the spring 27 and acts on the movable contact 20 by means of the second inclined surface 39, which induces in the movable contact 20 a lengthwise traversing movement that breaks the adherence.
  • the movable contact 20 When the adherence is broken, the movable contact 20 is thrust by the spring 27 in the direction of the arrow 29 and cooperates with the first inclined surface 38.
  • the movable contact 20 comprises a first abutment 40 able to cooperate with the first inclined surface 38.
  • the movable contact 20 comprises a second abutment 41 too which is suitable to cooperate with the second inclined surface 39.
  • first inclined surface 38 it is possible for the first inclined surface 38 not to be provided, for the adherence-release device can function just the same without it.
  • first inclined surface 38 is required where it is desired not to increase the value of the torque necessary to rotate the lever 21 when the latter 21 is working by means of extra travel in a resilient field.
  • the spring 27 is able to extend and moves the movable contact 20 in the directions of the arrows 29 and 30 and thrusts it to cooperate with the first inclined surface 38.
  • the first inclined surface 38 displaces further in the direction of the arrow 30 the movable contact 20, which therefore does not come into contact with the second inclined surface 39.
  • the action of the two inclined surfaces 38-39 possesses the same sign and should be considered in relation to the rotation of the lever 21 and in relation to the rotation of the movable contact 20 about the common contact 24.
  • the spirit of the invention includes a variation of the three-dimensional positions of the inclined surfaces 38- 39 while keeping the working effect in full.

Landscapes

  • Mechanisms For Operating Contacts (AREA)
EP90102474A 1990-02-08 1990-02-08 Méthode et dispositif pour ouvrir les contacts dans des minuteries employants des disques rotatifs Withdrawn EP0440857A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP90102474A EP0440857A1 (fr) 1990-02-08 1990-02-08 Méthode et dispositif pour ouvrir les contacts dans des minuteries employants des disques rotatifs

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP90102474A EP0440857A1 (fr) 1990-02-08 1990-02-08 Méthode et dispositif pour ouvrir les contacts dans des minuteries employants des disques rotatifs

Publications (1)

Publication Number Publication Date
EP0440857A1 true EP0440857A1 (fr) 1991-08-14

Family

ID=8203613

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90102474A Withdrawn EP0440857A1 (fr) 1990-02-08 1990-02-08 Méthode et dispositif pour ouvrir les contacts dans des minuteries employants des disques rotatifs

Country Status (1)

Country Link
EP (1) EP0440857A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102809482A (zh) * 2012-08-02 2012-12-05 龙工（上海）挖掘机制造有限公司 一种挖掘机回转支承预装检验方法

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3243548A (en) * 1961-06-07 1966-03-29 Bendix Corp Constant actuating force control switch with contact weld breaking means
GB2091042A (en) * 1980-12-30 1982-07-21 Carpano & Pons Electric switch with positive opening device
DE3415539A1 (de) * 1984-04-26 1985-11-07 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt Elektrischer schalter zur steuerung eines laststromes

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3243548A (en) * 1961-06-07 1966-03-29 Bendix Corp Constant actuating force control switch with contact weld breaking means
GB2091042A (en) * 1980-12-30 1982-07-21 Carpano & Pons Electric switch with positive opening device
DE3415539A1 (de) * 1984-04-26 1985-11-07 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt Elektrischer schalter zur steuerung eines laststromes

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102809482A (zh) * 2012-08-02 2012-12-05 龙工（上海）挖掘机制造有限公司 一种挖掘机回转支承预装检验方法

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PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

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Designated state(s): DE ES FR

17P Request for examination filed

Effective date: 19911210

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Effective date: 19940207

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18D Application deemed to be withdrawn

Effective date: 19940618