EP0160796B1 - Schalteranordnung - Google Patents

Schalteranordnung Download PDF

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Publication number
EP0160796B1
EP0160796B1 EP85102106A EP85102106A EP0160796B1 EP 0160796 B1 EP0160796 B1 EP 0160796B1 EP 85102106 A EP85102106 A EP 85102106A EP 85102106 A EP85102106 A EP 85102106A EP 0160796 B1 EP0160796 B1 EP 0160796B1
Authority
EP
European Patent Office
Prior art keywords
contact
key cylinder
key
actuating element
switch
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.)
Expired
Application number
EP85102106A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0160796A1 (de
Inventor
Dietmar Roepke
Franz-Josef Knoop
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.)
Wincor Nixdorf International GmbH
Original Assignee
Nixdorf Computer AG
Siemens Nixdorf Informationssysteme AG
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 Nixdorf Computer AG, Siemens Nixdorf Informationssysteme AG filed Critical Nixdorf Computer AG
Publication of EP0160796A1 publication Critical patent/EP0160796A1/de
Application granted granted Critical
Publication of EP0160796B1 publication Critical patent/EP0160796B1/de
Expired legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H31/00—Air-break switches for high tension without arc-extinguishing or arc-preventing means
    • H01H31/003—Earthing switches
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H27/00—Switches operated by a removable member, e.g. key, plug or plate; Switches operated by setting members according to a single predetermined combination out of several possible settings
    • H01H27/06—Key inserted and then turned to effect operation of the switch
    • 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
    • H01H9/12—Means for earthing parts of switch not normally conductively connected to the contacts

Definitions

  • the invention relates to a switch arrangement according to the preamble of claim 1 and is based on DE-A-3 204 020.
  • a key switch with a cylinder lock in which the lock cylinder is a movable contact element which is permanently connected to ground via a housing wall which carries the key switch and is grounded.
  • the key switch is used to ground one end of a winding of an ignition coil in the locked state of the cylinder lock by means of an axial displacement of the metal locking cylinder, so that no ignition voltage can be built up in the ignition coil.
  • the locking cylinder must be grounded with a metal lock housing and a metal housing wall for the key switch. This document does not intend to protect circuit parts against static charges when the key switch is touched.
  • DE-A-2 402 123 describes a cylinder lock whose metal locking cylinder is located in a plastic housing.
  • the locking cylinder is connected to a first pole of a voltage source via a connecting lug radially led out of the plastic housing.
  • the tumblers formed by pin columns are each connected to the second pole of the voltage source via consumers.
  • metallic parts of selected pin columns can be brought into contact with the locking cylinder, so that a circuit is closed in this way.
  • the locking cylinder itself forms a movable contact element. Protection of circuit parts against static charges is also not considered in this embodiment.
  • such a key switch is hardly suitable for use on printed circuit boards because of its radially protruding design.
  • a rotary switch is known from US-A-3 710 042, the shaft of which is intended for actuating an adjustable contact element is continuously grounded via the shaft holder. This avoids endangering users or service personnel if there is a voltage on the switch shaft due to any fault in the device having the rotary switch.
  • the invention has for its object to design a switch arrangement of the type mentioned with the simplest possible means so that a harmful influence of electrostatic discharge pulses on the circuits connected to the switch arrangement is avoided.
  • the earth connection element is connected to the earth of the device receiving the switch arrangement when the switch arrangement is installed, so that a user can discharge himself by touching or inserting the key via this earth connection. Although this discharge current may be uncomfortable for the user, a harmful influence on the electrical or electronic components connected to the switch arrangement is avoided.
  • the radial dimensions of conventional switch arrangements can be retained, which is particularly advantageous with regard to the assembly of such switch arrangements on printed circuit boards with the narrow arrangement of components which is customary in these.
  • the ground connection element is preferably designed as a plug connection with two plug elements directed coaxially to the locking cylinder, one of which is connected to the locking cylinder.
  • the one plug element can be formed by a socket arranged on the bottom of the switch housing, while the locking cylinder is connected to an axially directed pin which engages in the socket and rotates in the switch housing when the locking cylinder is rotated.
  • This embodiment is extremely simple and reliable, at least as long as the lock cylinder is rotated with the key both in its switched-on position and in its switched-off position.
  • the switch arrangement defined in independent claim 4 solves the problem on which the invention is based with the advantage that only a single part, namely the contact spring, is required for the ground connection. This solution is therefore inexpensive to manufacture and easy to assemble.
  • FIG. 1 shows a switch arrangement, generally designated 10, with a switch housing 12, comprising a lower first housing part 14, into which an upper second housing part 16 is clipped in a manner not shown.
  • Fixed contact pins 20 are arranged in the bottom 18 of the lower housing part 14 and can be soldered into corresponding grid openings in a printed circuit board 22.
  • a locking cylinder 24 is rotatably mounted, which can be rotated by means of a key 26.
  • the locking cylinder 24 has at its lower end an axially directed, angular extension 28 which engages in a complementary recess of an actuating element 30 in order to rotate the same when the locking cylinder 24 rotates.
  • the actuating element 30 is rotatably mounted in the lower housing part 14 by means of a radial flange 32 and has a radial nose 34, which serves to press a movable contact element 36 against the fixed contact elements 20 and thus to establish a switching connection. If the actuating element 30 is rotated by 90 ° from the position shown in FIG. 1, the movable contact element 36 becomes free and can lift off from the fixed contact element due to its spring-elastic pretension, so that the switching connection is interrupted.
  • a contact pin 44 arranged in the axial direction of the latter is used, which penetrates the bottom of the lower housing part 14 and comes into contact with the metallic extension 28 of the locking cylinder 24 through the actuating element 30.
  • the contact pin 44 is connected to an earth path of the printed circuit board 22. Regardless of the position of the locking cylinder 24, there is therefore always a conductive connection between the locking cylinder 24 and an earth line. If an operator who has become statically charged in the room grips the key 26 or the locking cylinder 24, the latter is usually charged accordingly. Differential voltages to the environment of a few thousand volts can easily arise.
  • FIG. 2 The embodiment according to FIG. 2 is similar to the embodiment described in FIG. 1, however, instead of a contact pin 44 on the bottom of the lower housing part 14, a contact plate 48 is attached with a solder pin 46, on which there is the bottom of the lower housing part 14 and that Actuating element 30 supports in a bore 50 penetrating helical compression spring 52 which tensions a contact pin 54 against the underside of the locking cylinder 24.
  • this solution has the advantage that the contact pin 54 is always kept in close contact with the locking cylinder 24 by the compression spring 52.
  • the locking cylinder 24 carries at its lower end a contact pin 56 which engages in a contact socket 58 which is embedded in the bottom of the lower housing part 14 and penetrates the actuating element 30 and which in turn is connected to a soldering pin 60.
  • FIGS. 4 and 5 A particularly preferred embodiment is shown in FIGS. 4 and 5.
  • a plate spring 64 On a radially inwardly projecting support surface 62 of the lower housing part 14 there is a plate spring 64, the outer contour of which is essentially square in adaptation to the cross section of the switch housing and which has a circular cutout 66 for the locking cylinder 24.
  • radial slots 68 By means of radial slots 68, four sectors 70 are formed in the plate spring 64, which are bent upwards in the manner shown in FIG. 6, so that they abut the bottom 72 of the locking cylinder 24.
  • the plate spring 64 can be connected to a ground line of the connected printed circuit board 22 via contact pins 74 (FIG. 4) arranged in the lower housing part 14.
  • This solution has the advantage that a large-area and thus safe, low-resistance and low-induction conductive connection is created between the locking cylinder 24 and a ground line.
  • the plate spring 64 is easy and inexpensive to produce as a stamped part and can be installed in the switch housing 12 in the simplest way.
  • FIGS. 6 and 7 finally shows an embodiment which is also very inexpensive and easy to manufacture and assemble.
  • the conductive connection between the locking cylinder 24 and a corresponding grounding line on the printed circuit board 22 takes place via a wire-shaped contact spring 76 which is anchored at one end in a blind hole 78 in the bottom of the lower housing part 14 and at the other end on the diametrically opposite side of the Switch housing is passed through an opening 80 in the bottom of the lower housing part 14 and inserted into a corresponding grid hole in the printed circuit board 22.
  • the contact spring 76 is bent around the locking cylinder 24 so that it abuts the bottom 72 of the locking cylinder housing over part of this distance.
  • the design of the plate spring 64 and the wire-shaped contact spring can also be such that they rest on the locking cylinder 24 instead of on the bottom 72 of the locking cylinder housing.

Landscapes

  • Push-Button Switches (AREA)
EP85102106A 1984-04-03 1985-02-26 Schalteranordnung Expired EP0160796B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19843412430 DE3412430A1 (de) 1984-04-03 1984-04-03 Schalteranordnung
DE3412430 1984-04-03

Publications (2)

Publication Number Publication Date
EP0160796A1 EP0160796A1 (de) 1985-11-13
EP0160796B1 true EP0160796B1 (de) 1989-08-02

Family

ID=6232503

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85102106A Expired EP0160796B1 (de) 1984-04-03 1985-02-26 Schalteranordnung

Country Status (2)

Country Link
EP (1) EP0160796B1 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
DE (2) DE3412430A1 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE8711243U1 (de) * 1987-08-18 1987-10-08 Nixdorf Computer Ag, 4790 Paderborn Zylinderschloß mit elektrischer Schalteranordnung
US5742734A (en) * 1994-08-10 1998-04-21 Qualcomm Incorporated Encoding rate selection in a variable rate vocoder
DE29600394U1 (de) * 1996-01-11 1996-03-28 Albrecht Jung GmbH & Co. KG, 58579 Schalksmühle Elektrischer Installationsschalter mit Schließzylinder und Sicherheitseinrichtung
US6046664A (en) * 1998-03-05 2000-04-04 Century Manufacturing Company Welding power supply transformer apparatus and method

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2402123A1 (de) * 1973-05-03 1974-11-28 Schlage Lock Co Schlosszylinder und elektrischer schalter
DE3204020A1 (de) * 1982-02-05 1983-08-18 ddm hopt & schuler GmbH & Co KG, 7210 Rottweil Schluesselschalter

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3710042A (en) * 1971-06-28 1973-01-09 Scott & Fetzer Co Rotary switch with retaining clip for grounding shaft to chassis terminal
US3766341A (en) * 1973-02-20 1973-10-16 Ramm Ind Locking device
US4264792A (en) * 1979-09-20 1981-04-28 Brammall, Inc. Safety locking system

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2402123A1 (de) * 1973-05-03 1974-11-28 Schlage Lock Co Schlosszylinder und elektrischer schalter
DE3204020A1 (de) * 1982-02-05 1983-08-18 ddm hopt & schuler GmbH & Co KG, 7210 Rottweil Schluesselschalter

Also Published As

Publication number Publication date
DE3572077D1 (en) 1989-09-07
EP0160796A1 (de) 1985-11-13
DE3412430A1 (de) 1985-10-03
DE3412430C2 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) 1987-11-05

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