EP0554540A2 - Commutateur rotatif à cames - Google Patents

Commutateur rotatif à cames Download PDF

Info

Publication number
EP0554540A2
EP0554540A2 EP92120692A EP92120692A EP0554540A2 EP 0554540 A2 EP0554540 A2 EP 0554540A2 EP 92120692 A EP92120692 A EP 92120692A EP 92120692 A EP92120692 A EP 92120692A EP 0554540 A2 EP0554540 A2 EP 0554540A2
Authority
EP
European Patent Office
Prior art keywords
contacts
cam
auxiliary
main
switch according
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
EP92120692A
Other languages
German (de)
English (en)
Other versions
EP0554540B1 (fr
EP0554540A3 (fr
Inventor
Albert Wachter
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.)
Haschkamp geb Dreefs Ernestine
Original Assignee
Haschkamp geb Dreefs Ernestine
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 Haschkamp geb Dreefs Ernestine filed Critical Haschkamp geb Dreefs Ernestine
Publication of EP0554540A2 publication Critical patent/EP0554540A2/fr
Publication of EP0554540A3 publication Critical patent/EP0554540A3/xx
Application granted granted Critical
Publication of EP0554540B1 publication Critical patent/EP0554540B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H19/00—Switches operated by an operating part which is rotatable about a longitudinal axis thereof and which is acted upon directly by a solid body external to the switch, e.g. by a hand
    • H01H19/54—Switches operated by an operating part which is rotatable about a longitudinal axis thereof and which is acted upon directly by a solid body external to the switch, e.g. by a hand the operating part having at least five or an unspecified number of operative positions
    • H01H19/60—Angularly-movable actuating part carrying no contacts
    • H01H19/62—Contacts actuated by radial cams
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
    • H01H9/30—Means for extinguishing or preventing arc between current-carrying parts
    • H01H9/38—Auxiliary contacts on to which the arc is transferred from the main contacts

Definitions

  • the invention relates to a multi-pole tap changer, in particular in the form of a rotary cam switch, with a plurality of main contacts, e.g. for step-by-step parallel and series connection of heating resistors.
  • Such switches are widely used for hotplate control in stoves.
  • multi-cycle control circuits with 12 or more step switch positions are now in use, in which a phase change when switching between certain stages is no longer necessary is avoidable.
  • the switch is equipped with a further switch contact makes it possible to de-energize the main contacts (but also the other main contacts) which carry out the phase change, because the entire switching capacity can be taken over by the auxiliary contacts.
  • the auxiliary contacts open before the main contacts are actuated. Since this switching function must apply to both directions of rotation, this circuit cannot simply be implemented by means of a fixed relative arrangement of the cams for main and auxiliary contacts. Instead, it is convenient
  • a coupling between the switching elements for main and auxiliary contacts is provided, which has a lost motion connection, which is effective in both directions of rotation.
  • the shift drum or the switching element for the auxiliary contacts is rigidly connected to the switch shaft to be rotated by the operator via the switch knob, and the switching element for the main contacts follows this actuating movement with a delay via the lost motion clutch.
  • auxiliary contacts which prevent short-circuiting in the event of a phase change, can already be connected in series with the associated main contacts within the switch base.
  • these auxiliary contact connections are expediently wired when the switch is installed.
  • an auxiliary contact can be provided for each phase or the neutral conductor.
  • the cam switch has a base 10 which rotatably supports a continuous switch shaft 12.
  • the switch shaft 12 is flattened.
  • a cam roller 14 with switching cams 16 for the main contacts 17 is rotatably mounted on the switch shaft 12.
  • the non-rotatable mounting is ensured in that the through hole of the cam roller 18 is adapted to the cross section of the switch shaft.
  • the cam roller 14 for the main contacts has a circular through hole so that it can rotate on the switch shaft 12.
  • the two cam rollers 14 and 18 are coupled on the end face via a dog clutch 22, which has a certain rotational play. Accordingly, by rotating the switch shaft 12, the cam roller 18 is initially taken without play, and this takes the cam roller 14 with it via the drag play of the clutch 22.
  • the two cam rollers 14 and 18 are fixed in their respective angular positions via separate detents.
  • the latching for the cam roller 14 of the main contacts can be seen in Fig. 3.
  • the detent for the cam roller 18 is designed in a corresponding manner.
  • the clutch 22 which is equipped with rotational play or lost motion, has the effect that the main contacts are actuated with a delay compared to the immediately actuated auxiliary contacts, so that the auxiliary contacts are reliably interrupted in both directions of rotation before the main contacts making the phase change are switched.
  • two parallel auxiliary contacts 21 ' are provided, which are switched by two separate switching stars 28 and 30, respectively.
  • the parallel connection of the time-delayed contacts 21 ' ensures that even at small switching angles there is an interruption in the current before the main contacts switch.
  • the parallel contacts according to FIG. 7 are actuated or opened sequentially in time, because with a small switching angle and only one switching cam for the auxiliary contact, the contact opening width is too small and the switching reliability would not be sufficient if the contact was closed.
  • FIG. 8 shows an example of a circuit arrangement of the cam switch according to the invention in an 11-cycle cam circuit. According to the exemplary embodiment, it is a hotplate control circuit with three heating resistors (per hotplate). As can be seen from FIG. 8, these are successively connected individually and in series and in parallel, a further possibility of variation being provided by the diode, whereby the heating power is halved in each case.
  • auxiliary contacts 21 are provided according to the invention.
  • these auxiliary contacts 21 only needed to be provided between N and S or T and N.
  • all main contacts are provided with the auxiliary contacts.
  • the contacts are accordingly activated in such a way that the auxiliary contacts open before the main contacts open, which switch the phase change.
  • the auxiliary contacts are expediently opened before the main contacts open so that the arc is broken.
  • the cam for actuating the auxiliary contacts 21 is directly coupled to the switch axis 12, while the cam roller 14 for the main contacts lags over the lost motion clutch connection 22 by an angle. Since each cam roller 14 or 18 is assigned its own detent, the trailing cam roller 14 is brought into the end position by the detent star as soon as the tip of the detent star is passed over.
  • the function of the phase interruption can be distributed to two or more auxiliary contacts connected in parallel with one another and in series with the main switch, as can be seen from FIG. 7.
  • auxiliary contacts only in phase S and in neutral N in order to prevent dangerous switching states when the phase changes between IX and VIII.
  • phase change between stages VII and VI only relatively small powers are switched, so that the auxiliary contact in phase T could be omitted, but as mentioned, an arrangement of auxiliary contacts in both phase lines and in the neutral conductor appears expedient for safety reasons.
  • the invention has been described above using a rotary cam switch. However, the invention can also be applied to other switches in which the problem of phase change occurs when changing from one stage to the other.

Landscapes

  • Rotary Switch, Piano Key Switch, And Lever Switch (AREA)
EP92120692A 1992-02-06 1992-12-04 Commutateur rotatif à cames Expired - Lifetime EP0554540B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4203429 1992-02-06
DE4203429A DE4203429A1 (de) 1992-02-06 1992-02-06 Nockendrehschalter

Publications (3)

Publication Number Publication Date
EP0554540A2 true EP0554540A2 (fr) 1993-08-11
EP0554540A3 EP0554540A3 (fr) 1994-02-09
EP0554540B1 EP0554540B1 (fr) 1996-11-06

Family

ID=6451096

Family Applications (1)

Application Number Title Priority Date Filing Date
EP92120692A Expired - Lifetime EP0554540B1 (fr) 1992-02-06 1992-12-04 Commutateur rotatif à cames

Country Status (2)

Country Link
EP (1) EP0554540B1 (fr)
DE (2) DE4203429A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE29818196U1 (de) 1998-10-12 1999-01-07 DREEFS GmbH Schaltgeräte und Systeme, 96364 Marktrodach Nockendrehschalter

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE735269C (de) * 1941-01-23 1943-05-11 Ferdinand Dann Handschalter mit einer Kontaktwalze zur Steuerung eines Schuetzes fuer stromloses Schalten der Hauptkontakte
CH241518A (de) * 1944-05-04 1946-03-15 Sauter Ag Handbetätigter Schalter mit rotierenden Schaltnocken.
BE460199A (fr) * 1944-12-26
DE1239034B (de) * 1964-03-10 1967-04-20 Ernst Dreefs Ges Mit Beschraen Siebentaktregelschaltung fuer Kochplatten
FR2118828B1 (fr) * 1971-04-22 1973-06-08 Cattaneo Baptiste
DE2604783C3 (de) * 1976-02-07 1979-10-04 E.G.O. Elektro-Geraete Blanc U. Fischer, 7519 Oberderdingen Elektrischer Nockenschalter

Also Published As

Publication number Publication date
EP0554540B1 (fr) 1996-11-06
EP0554540A3 (fr) 1994-02-09
DE59207495D1 (de) 1996-12-12
DE4203429A1 (de) 1993-08-12

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