US3539750A - Switch for high amperage current - Google Patents

Switch for high amperage current Download PDF

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Publication number
US3539750A
US3539750A US729685A US3539750DA US3539750A US 3539750 A US3539750 A US 3539750A US 729685 A US729685 A US 729685A US 3539750D A US3539750D A US 3539750DA US 3539750 A US3539750 A US 3539750A
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US
United States
Prior art keywords
switch
contact
support member
contacts
movable
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
US729685A
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English (en)
Inventor
Per Holm
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.)
Uddeholms AB
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Uddeholms AB
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 Uddeholms AB filed Critical Uddeholms AB
Application granted granted Critical
Publication of US3539750A publication Critical patent/US3539750A/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
    • H01H33/00—High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
    • H01H33/002—Very heavy-current switches
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H1/00—Contacts
    • H01H1/58—Electric connections to or between contacts; Terminals
    • H01H1/5822—Flexible connections between movable contact and terminal
    • H01H2001/5827—Laminated connections, i.e. the flexible conductor is composed of a plurality of thin flexible conducting layers

Definitions

  • the invention is concerned with a switch for high amperage current, and particularly with a switch for direct current supplied to electrolytic processes, such as the manufacture of chlorine and alkali in a mercury cell.
  • the switch of the invention is of the known type comprising a stationary contact, a movable contact, and operating means for moving the movable contact into and out of engagement with the stationary contact.
  • Known switches of this type utilize a complicated system of levers, for instance, to engage the movable contact with the stationary contact at a sufficient pressure. It is the object of the invention to provide an inexpensive and uncomplicated switch, in which the movable contact can engage and disengage the stationary contact in a reliable way and using a minimal number of moving parts only.
  • the switch of the invention comprises a base, a stationary contact mounted in said base, a first current conductor connected to said stationary contact, a movable contact mounted in said base, a second, flexible, current conductor connected to said movable contact, operating means for engaging and disengaging the movable contact with the stationary contact, said operating means being actuated by a pressurized fluid at least in bringing the movable contact to engage the stationary contact, and locking means for holding the movable contact in engagement with the stationary contact.
  • the operating means may be a cylinder-piston means, or it may consist of a box containing a membrane which is actuated by the pressurized fluid, as will be disclosed on the drawing.
  • the operating means is preferably double-acting, i.e. the piston or the membrane is actuated by the pressurized fluid in two directions.
  • the operating member can be designed so as to be actuated by the pressurized fluid in engaging the contacts, and to be actuated by a spring in disengaging the contacts.
  • FIG. 1 represents a view of the switch
  • FIG. 2 discloses an alternative embodiment of the operating means.
  • the illustrated switch contains a rectangular base or frame 1-4.
  • One end of the frame portions 2 and 4 is welded to the frame portions 1.
  • the other end of the frame portions 2 and 4 is provided with flange portions 22.
  • the frame portion 3 is fastened to said flange portions 22 by means of bolts 24.
  • Insulating members 23 provide an electric insulation between the frame portion 3 and the other frame portions.
  • the contact members 5a are fastened to the frame portion 3 by means of screws 27.
  • the contact members 5a consist of copper and have a rounded contact surface 5b.
  • the four contact members 5a constitute the stationary contact of the switch.
  • a rigid current conductor 6 is jammed between the contact members 5a and the frame portion 3.
  • the movable contact of the switch consists of four copper contact members 8a, having rounded contact surfaces 811, each of them being fastened to a steel plate 21 by means of screws 20.
  • a flexible current conductor 7 is jammed between each contact member 8a and its steel plate 21.
  • the top of each current conductor 7 is provided with holes 28 for fastening the conductor to a stationary current supply member.
  • the current conductors 7 consist of a plurality of copper strips which are bent in their lower portion 19. Thus, each copper strip has the double length of the conductor 7. This provides a guarantee for a minimum of loss due to electrical re sistance, if the conductivity between two adjacent copper strips should be reduced due to a coating on the copper strips, for instance an oxide coating.
  • Each steel plate 21 is provided on one end of a rod 9 extending horizontally through an opening in a support member 11.
  • the other end of the rod 9 is threaded and carries double nuts 10.
  • the rod supports a coil spring 12 having one end abutting on the steel plate 21, and the other end abutting on the support member 11, thus urging said parts to move apart.
  • the position of the contact members 8a is adjusted by means of the nuts 10. If desired, the two extreme contact members 8a may be situated slightly closer to the corresponding contact members 5a than are the two middle contact members 8a. This reduces the formation of sparks in the switch-off operation.
  • the support member 11 is fastened to one end of a rod 13.
  • the other end of the rod 13 is fastened to the membrane of a double-acting operating member 14 which is actuated by pressurized air supplied through tubes 15, 16.
  • the operating member 14 has a threaded portion 25 extending through an opening in the frame portion 1.
  • the threaded portion 25 supports two nuts 26 screwed tightly against the frame portion 1.
  • the supporting member 11 also supports two rods '17 extending through openings in the frame portion 1 and having nuts 18a, 18b on their threaded end portions, the nuts 18b serving as an optionally usable locking device to lock the contacts in the engaged position, whenever desired.
  • pressurized air is supplied through the tube 16.
  • the supporting member 11 moves the stationary contact members 81': by way of the springs 9 to engage the contact members 5a in a resilient manner.
  • the nuts 18b can now be rotated so as to engage the frame portion 1.
  • the switch is now locked in the switch-on position.
  • the two sets of contact members are pressed against each other with a force defined by the operating member 14.
  • the rounded contact surfaces 81) and 5b ensure a. high contact pressure per unit area.
  • the nuts 18b are released, and pressurized air is supplied through the tube 15.
  • the supporting member 11 now pulls the contact members 8a out of engagement with the contact members 511.
  • FIG. 2 illustrates an alternative embodiment of the operating means. It consists of a housing 31 divided into two chambers by means of a flexible membrane 32 consisting of rubber, for instance.
  • the end of the rod 33 which has the function of rod 13 in the FIG. 1 embodiment, is fastened to said membrane 32.
  • Pressurized air can be supplied to the left-hand chamber through a tube 30, for producing the switch-on stroke.
  • the operating means is similar to that disclosed in FIG. 1.
  • the d'ifi'erence is that the switch-01f stroke is produced by means of a coil spring 35 urging to press the membrane 32 in the left-hand direction.
  • the advantage of this embodiment is that a failure of the pressurized air always results in the switch being brought into the switch-oil. position, i.e. the position indicated in dotted lines in FIG. 2, provided of course that the contacts 8a, 5a have not been locked in their engaged position by the locking nuts 18b.
  • an electrical switch adapted particularly for low voltage high amperage current applications the combination comprising a base, a stationary contact member mounted on said base, a first current conductor connected to said stationary contact, a support member located on said base and arranged for movement relative thereto, a plurality of movable contacts, a plurality of flexible current conductors each of which is connected to one of said movable contacts, means individually and resiliently mounting said movable contacts on said support member such that said movable contacts are movable relative to said support member in a resilient manner, operating means secured to said base and coupled to said support member for actuating said support member and said resiliently mounted movable contacts thereon towards and away from said stationary contact to effect engagement and disengagement respectively of said contacts, said operating means including a fluid pressure responsive actuator connected to said support member and means for supplying a pressurized fluid to said actuator to urge the latter and hence also said support member and said movable contacts at least in the direction in which said movable contacts eflect engagement with said stationary contact, and an optionally usable
  • said locking device includes at least one rod secured at one end thereof to said support member, the other end of said rod threaded and extending through an aligned opening in said base, and a locking nut on said threaded end and which is turnable into engagement with said base when said support member has been moved into the contact engaging position thereby preventing any return movement of said support member and movable contacts in the opposite direction.

Landscapes

  • Push-Button Switches (AREA)
  • Switches Operated By Changes In Physical Conditions (AREA)
  • Contacts (AREA)
US729685A 1967-06-05 1968-05-16 Switch for high amperage current Expired - Lifetime US3539750A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE7877/67A SE323735B (forum.php) 1967-06-05 1967-06-05

Publications (1)

Publication Number Publication Date
US3539750A true US3539750A (en) 1970-11-10

Family

ID=20272546

Family Applications (1)

Application Number Title Priority Date Filing Date
US729685A Expired - Lifetime US3539750A (en) 1967-06-05 1968-05-16 Switch for high amperage current

Country Status (7)

Country Link
US (1) US3539750A (forum.php)
DE (1) DE1765415C3 (forum.php)
FI (1) FI48883C (forum.php)
FR (1) FR1590613A (forum.php)
GB (1) GB1222592A (forum.php)
NO (1) NO126408B (forum.php)
SE (1) SE323735B (forum.php)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4623769A (en) 1982-10-28 1986-11-18 Siemens Aktiengesellschaft Continuous-current switch for shorting at least one superconducting magnet winding
CN106057556A (zh) * 2016-06-29 2016-10-26 常俊苹 一种高压电气开关

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ZA767618B (en) * 1976-01-19 1977-11-30 Westinghouse Electric Corp Low voltage vacuum switch and operating mechanism
SE7905678L (sv) 1979-06-28 1980-12-29 Esab Ab Stromoverforingsdon
DE3627695A1 (de) * 1986-08-14 1988-02-25 Teves Gmbh Alfred Elektrohydraulische schaltvorrichtung
DE3709988A1 (de) * 1987-03-26 1988-10-06 Bbc Brown Boveri & Cie Hydraulischer oder pneumatischer antrieb zur betaetigung des beweglichen schaltkontaktes eines mittel- und/oder hochspannungs-leistungsschalters
SE9101831L (sv) * 1991-06-14 1993-03-10 Asea Brown Boveri Saekerhetsbrytare med lutningsindikering

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2564133A (en) * 1951-08-14 Stadler
US3153131A (en) * 1958-08-27 1964-10-13 Gratzmuller Jean Louis Switch for large currents with one contact plastically deformable in proportion to current value
US3306998A (en) * 1965-10-23 1967-02-28 Robertshaw Controls Co Snap action device
US3344248A (en) * 1967-09-26 Switch for high energy circuits
US3358105A (en) * 1963-11-16 1967-12-12 English Electric Co Ltd Gas blast circuit breaker and operating means therefor

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE539556C (de) * 1931-11-28 Siemens Schuckertwerke Akt Ges Anordnung an Kontakten von Luftschaltern mit Lichtbogenloeschung durch Druckluft
DE42335C (de) * G. FULDA in Berlin SW., Wilhelmstr. 34 Druckregelungsventil für hochgespannte Flüssigkeiten und Gase
DD47947A (forum.php) *
DE496011C (de) * 1927-11-05 1930-04-15 Tecalemit Sa Des Ets Vorrichtung zum selbsttaetigen Unterbrechen des Stromkreises von auf Fahrzeugen, insbesondere Kraftfahrzeugen, befindlichen Akkumulatoren
AT209413B (de) * 1955-11-04 1960-06-10 Jean Louis Gratzmuller Hydraulische Betätigungseinrichtung für elektrische Schaltgeräte, insbesondere Hochspannungsschalter
DE1147651B (de) * 1960-06-04 1963-04-25 Bosch Gmbh Robert Durch ein Druckmittel betaetigbarer elektrischer Biegehautschalter
DE1125513B (de) * 1960-06-22 1962-03-15 Licentia Gmbh Schutzeinrichtung an elektrohydraulischen Schaltwerken
FR1431482A (fr) * 1964-04-14 1966-03-11 Edison Soc Interrupteur à contacts multiples
FR1454452A (fr) * 1965-08-04 1966-02-11 Comp Generale Electricite Court-circuiteur

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2564133A (en) * 1951-08-14 Stadler
US3344248A (en) * 1967-09-26 Switch for high energy circuits
US3153131A (en) * 1958-08-27 1964-10-13 Gratzmuller Jean Louis Switch for large currents with one contact plastically deformable in proportion to current value
US3358105A (en) * 1963-11-16 1967-12-12 English Electric Co Ltd Gas blast circuit breaker and operating means therefor
US3306998A (en) * 1965-10-23 1967-02-28 Robertshaw Controls Co Snap action device

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4623769A (en) 1982-10-28 1986-11-18 Siemens Aktiengesellschaft Continuous-current switch for shorting at least one superconducting magnet winding
CN106057556A (zh) * 2016-06-29 2016-10-26 常俊苹 一种高压电气开关

Also Published As

Publication number Publication date
FR1590613A (forum.php) 1970-04-20
FI48883B (forum.php) 1974-09-30
DE1765415C3 (de) 1982-02-25
DE1765415A1 (de) 1971-07-22
DE1765415B2 (de) 1981-06-19
NO126408B (forum.php) 1973-01-29
SE323735B (forum.php) 1970-05-11
FI48883C (fi) 1975-01-10
GB1222592A (en) 1971-02-17

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