US3873797A - Switch position indicator for electromagnetic switchgear - Google Patents

Switch position indicator for electromagnetic switchgear Download PDF

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Publication number
US3873797A
US3873797A US386437A US38643773A US3873797A US 3873797 A US3873797 A US 3873797A US 386437 A US386437 A US 386437A US 38643773 A US38643773 A US 38643773A US 3873797 A US3873797 A US 3873797A
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US
United States
Prior art keywords
invention according
switchgear
indicating member
chamber
arcing chamber
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 - Lifetime
Application number
US386437A
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English (en)
Inventor
Joachim Hannich
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.)
Siemens AG
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Siemens 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 Siemens AG filed Critical Siemens AG
Application granted granted Critical
Publication of US3873797A publication Critical patent/US3873797A/en
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
    • H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
    • H01H9/16—Indicators for switching condition, e.g. "on" or "off"
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H50/00—Details of electromagnetic relays
    • H01H50/08—Indicators; Distinguishing marks

Definitions

  • ABSTRACT Foreign Application Priority Data
  • This invention relates to electromagnetic switchgear in general and more particularly to an improved switch position indicator for such switchgear.
  • switchgear designed with a nondetachable arcing chamber it is common practice to have an extension of the contact bridge carrier protrude beyond the contour of the switch housing when the switch is in the open position. When the switch is closed, the extension disappears into the switch housing so that an observer can conclude that the switch is closed.
  • switchgear having a detachable arcing chamber has in general been constructed so that the switching magnets next to the arcing chamber are visible so that it is possible to deduce the position of the switch from the position of the actuator magnet. Such an indication is not always accurate since a break of the connection between the switching magnet and the switch contact themselves can lead to a false indication of position.
  • the switch position indication be dependent on the movable contact themselves in the manner in which such indications are provided in non-detachable arcing chambers as described above.
  • German design Patent No. 71 165 59.8 an indicating member loaded by a return spring is guided in the arcing chamber and movable in the closing direction of the movable contact with limited mobility. This indicating member is pushed above the contour of the arcing chamber by the movable part of the switch when the contact are open.
  • the indicating member is held in the arcing chamber by a sheet metal part preferably designed as a are baffle with the sheet metal part riveted to the arcing chamber.
  • the switch position indicator of the present invention provides such an indication. It is usable in both switchgear having a fixed arcing chamber and that with a detachable arcing chamber, providing a reliable indication of switchgear position in each case.
  • the indicator is made of two parts which are adjustable relative to each other, with the indicator loaded by a return spring and guided so as to be movable with limited mobility as the contacts of the switch move. The indicator is moved by the moving contacts of the switch so as to extend above the contour of the arcing chamber to provide an indication of an open position and with the closing of the contacts retracts into the housing so that it is no longer visible, indicating a closed position.
  • the tolerances in the arcing chamber can be compensated for so that the indicator will give a reliable indication in each installation.
  • assembly is simplified in that it is not necessary to fish any extensions which are in connection with the contact bridge carrier through openings in the arcing chamber.
  • the adjustment between the two parts is done by internally threading one part. and externally threading the other so that they may be screwed in and out with respect to each other to shorten and lengthen the overall length of the indicating device.
  • Other means of adjustment are also possible such as providing locking action between the two parts, using detents or by cementing once proper adjustment is made.
  • the projecting or protruding portion of the indicator is made with an annular extension which fits into a matching recess on the top of the arcing chamber to thereby form an effective labyrinth seal.
  • FIG. 1 is a cross-sectional view of magnetic switchgear having the indicator of the present invention installed.
  • FIG. 2 is an elevation view, also in cross-section of the embodiment of FIG. 1.
  • the switchgear is supported by a base onto which are mounted two fixed contacts 3 secured in place by means of bolts 2. Also connected to the base 1 is an arcing chamber 4 having installed therein quenching baffles 5 and an arc guiding bridge 6. When operated, the two fixed contacts 3 are bridged by a movable contact bridge 7.
  • the contact bridge is connected through a leaf spring 8, over which is placed a yoke 9 connected to a helical spring 10, to a plastic part 11 which is in turn mounted on movable switching magnets.
  • the arrangement ofthe yoke 9 may more clearly be seen from an examination of FIG. 2. What has been described so far is a conventional switchgear arrangement.
  • the indicator 12 of the present invention comprises the two parts 14 and 15 which are adjustable relative to each other.
  • Part 14 is on top in operation will protrude above the contour of the arcing chamber 4 when the switch is opened.
  • Part 15 connected thereto serves as the spring retainer for a spring 13 which will tend to pull the indicator 12 into the position where it does not protrude above the arcing chamber.
  • the switch is in the opened position and the yoke 9 is pushing against the base of the part 15 thereby compressing the spring and pushing the indicator 12 up so that the part 14 is above the contour of the arcing chamber 4.
  • the top part 14 has an annular extension 18 which tits into a matching annular recess 19 formed in the top of the arcing chamber 14 to thereby form a labyrinth seal to prevent gases within the arcing chamber escaping therefrom.
  • the top portion 14 along with its annular protrusion and the annular recess 19 will be made of a square shape to prevent the turning of the upper portion 14 relative to the lower portion 15 and the arcing chamber.
  • the parts 14 and 15 are connectd with a threaded connection.
  • the part 14 contains an internal recess 16 which has internal threads cut therein.
  • the part 15 has a threaded extension 17 which screws into the internal threads in the recessed 16.
  • the threads can be made with slightly different pitch so as to provide a tighter connection.
  • the lower part 15 contains a'hexagonal recess 20 in its bottom so that an Allen wrench may be inserted therein to adjust the relative length of the overall indicating device 12. This length will be adjusted in each individual switchgear to compensate for manufacturing tolerance in the arcing chamber 4 such that in the opened position a visible protrusion of the indicator 12 above the arcing chamber will result but so that the length is not so long thatpressing down upon the indicator 12 will close the switch.
  • the bottom part 15 is made as a disk which is larger than needed to retain spring 13 in order to prevent any are which might be drawn between spring 8 and bridge 6 from hitting the spring 13. Further protection may be obtained by extending the disk to form an annular recess in which the spring 13 is enclosed as shown by the dotted lines on FIG. 1.
  • a switch position indicator for an electromagnetic switchgear of the type which has a detachable arcing chamber comprising:
  • said means to couple comprises a recess in said second upper part which is threaded containing internal threads and a threaded extention on said first lower portion having external threads which are screwed into the internal threads of said upper part.
  • said first lower part contains a means for holding said spring, which part partially is arranged for protecting it from arcs within the chamber.
  • said means for holding comprises an enlarged disk on the bottom of said lower part.

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Arc-Extinguishing Devices That Are Switches (AREA)
  • Arc Welding Control (AREA)
US386437A 1972-08-14 1973-08-07 Switch position indicator for electromagnetic switchgear Expired - Lifetime US3873797A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE7230068U DE7230068U (de) 1972-08-14 1972-08-14 Schaltzustandsanzeigevorrichtung für elektromagnetische Schaltgeräte

Publications (1)

Publication Number Publication Date
US3873797A true US3873797A (en) 1975-03-25

Family

ID=6632089

Family Applications (1)

Application Number Title Priority Date Filing Date
US386437A Expired - Lifetime US3873797A (en) 1972-08-14 1973-08-07 Switch position indicator for electromagnetic switchgear

Country Status (9)

Country Link
US (1) US3873797A (fr)
BR (1) BR7306178D0 (fr)
CH (1) CH557586A (fr)
DE (1) DE7230068U (fr)
ES (1) ES194044Y (fr)
FR (1) FR2196734A7 (fr)
GB (1) GB1446875A (fr)
IT (1) IT992876B (fr)
SE (1) SE391604B (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4007345A (en) * 1974-01-31 1977-02-08 Siemens Aktiengesellschaft Indicating arrangement for indicating the condition of the switching contacts of a switching vessel in a vacuum-switch apparatus
US4471183A (en) * 1981-11-02 1984-09-11 Siemens Aktiengesellschaft Three-phase switchgear
US5861591A (en) * 1997-07-31 1999-01-19 Gseg Llc Circuit breaker operator which actuates toggle and push button switches and has a misalignment indicator
US6191377B1 (en) * 1998-03-31 2001-02-20 Moeller Gmbh Electromagnetic switching device with arcing chambers

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3117914C2 (de) * 1981-05-06 1983-09-01 Siemens AG, 1000 Berlin und 8000 München Elektromagnetisches Schaltgerät

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US457483A (en) * 1891-08-11 Automatic electric-circuit switch
US2441137A (en) * 1943-10-05 1948-05-11 Anthony Robert P De Automatically locking relay
US2625625A (en) * 1950-06-02 1953-01-13 Mechanical Products Inc Free trip circuit breaker

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US457483A (en) * 1891-08-11 Automatic electric-circuit switch
US2441137A (en) * 1943-10-05 1948-05-11 Anthony Robert P De Automatically locking relay
US2625625A (en) * 1950-06-02 1953-01-13 Mechanical Products Inc Free trip circuit breaker

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4007345A (en) * 1974-01-31 1977-02-08 Siemens Aktiengesellschaft Indicating arrangement for indicating the condition of the switching contacts of a switching vessel in a vacuum-switch apparatus
US4471183A (en) * 1981-11-02 1984-09-11 Siemens Aktiengesellschaft Three-phase switchgear
US5861591A (en) * 1997-07-31 1999-01-19 Gseg Llc Circuit breaker operator which actuates toggle and push button switches and has a misalignment indicator
US5998750A (en) * 1997-07-31 1999-12-07 Egs Electrical Group Llc Circuit breaker operator with push to test arrangement
US6191377B1 (en) * 1998-03-31 2001-02-20 Moeller Gmbh Electromagnetic switching device with arcing chambers

Also Published As

Publication number Publication date
BR7306178D0 (pt) 1974-07-11
DE7230068U (de) 1974-01-31
GB1446875A (en) 1976-08-18
IT992876B (it) 1975-09-30
FR2196734A7 (fr) 1974-03-15
CH557586A (de) 1974-12-31
ES194044Y (es) 1975-04-01
SE391604B (sv) 1977-02-21
ES194044U (es) 1974-12-16

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