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US3378653A - Electrical slider switch - Google Patents

Electrical slider switch Download PDF

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Publication number
US3378653A
US3378653A US603622A US60362266A US3378653A US 3378653 A US3378653 A US 3378653A US 603622 A US603622 A US 603622A US 60362266 A US60362266 A US 60362266A US 3378653 A US3378653 A US 3378653A
Authority
US
United States
Prior art keywords
contact
plate
shaft
switch
leaf
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
US603622A
Other languages
English (en)
Inventor
Lynn Scott
Jack N Wilson
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.)
Dow Chemical Co
Original Assignee
Dow Chemical Co
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 Dow Chemical Co filed Critical Dow Chemical Co
Priority to US603622A priority Critical patent/US3378653A/en
Priority to BE710565D priority patent/BE710565A/xx
Priority to JP1037368A priority patent/JPS469097B1/ja
Priority to GB7962/68A priority patent/GB1202146A/en
Priority to DE19681640010 priority patent/DE1640010A1/de
Priority to FR140742A priority patent/FR1562227A/fr
Priority to NL6802613A priority patent/NL6802613A/xx
Application granted granted Critical
Publication of US3378653A publication Critical patent/US3378653A/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
    • H01H33/02—Details
    • H01H33/28—Power arrangements internal to the switch for operating the driving mechanism
    • H01H33/30—Power arrangements internal to the switch for operating the driving mechanism using fluid actuator
    • H01H33/32—Power arrangements internal to the switch for operating the driving mechanism using fluid actuator pneumatic
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H1/00—Contacts
    • H01H1/12—Contacts characterised by the manner in which co-operating contacts engage
    • H01H1/36—Contacts characterised by the manner in which co-operating contacts engage by sliding
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H15/00—Switches having rectilinearly-movable operating part or parts adapted for actuation in opposite directions, e.g. slide switch
    • H01H15/02—Details
    • H01H15/06—Movable parts; Contacts mounted thereon
    • 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

Definitions

  • the invention concerns a switch for low voltage, high current application. It is a sliding contact type switch, totally enclosed and submerged in oil, has few parts and is compact. The switch is especially well adapted to be connected in ganged assemblies and for operation by air cylinder or similar means.
  • This invention relates to electrical switches and particularly to high amperage, low voltage shunt circuit switches.
  • switches for use in low voltage, high current applications are known. Such switches are used in connection with thetoperatioiof electrolytic cells, such as chlorine-caustic cells, for example, and are thus subjected to conditions which tend to result in corrosion of the switches. Further, such switches and/ or their operating mechanisms tend to be bulky in relation to the current carrying capacity of the switches. Another problem with prior art switches is that many of them require special plating of the electrodes and contact areas of the switches. In addition reliability is often a problem, since downtime" of equipment while switches are being repaired is expensive from a plant operations standpoint.
  • a principal object of this invention is to provide an improved low voltage, high current switch.
  • Another object of this invention is to provide an improved longer lived low voltage, high current switch.
  • a further object of this invention is to provide an improved low voltage, high current switch which has high current carrying capacity in proportion to its bulk.
  • An additional object of this invention is to provide an improved low voltage, high current switch which is not subject to atmospheric corrosion.
  • An ancillary object of this invention is to provide an improved low voltage, high current switch which is well adapted for ganged operation.
  • a multiple contact slide bar switch which is totally enclosed with the switch elements immersed in fluid.
  • Balanced spring means are provided for directing the movable contacts against the fixed contacts at a predetermined pressure. Longitudinal movement of the bar of about one inch opens or closes the switch.
  • FIG. 1 is a plan view, with the switch cover removed, of a switch made in accordance with this invention
  • FIG. 2 is a sectional View taken along the line 22 of FIG. 1, and
  • FIG. 3 is a sectional view taken along the line 3-3 of FIG. 1.
  • apparatus 10 comprises a first contact plate 12, a second I contact plate 14, switch frame 16, and reciprocatable shaft 18 having a plurality of contact leaf assemblies 20 coupled thereto.
  • the first contact plate is a generally flat, rectangularly shaped plate having an array of bores 22 adjacent to the peripher of the plate.
  • the thickness of the plate is at least sufiicient to provide rigidity to the plate during operation of the switching apparatus.
  • the first contact plate 12 also has an array of spaced apart rectangularly shaped depressions 24 in the surface 26 thereof which faces the shaft 18.
  • the depressions 24 are disposed perpendicularly to the longitudinal axis of the plate (and to the axis of the shaft 18), and have length, width, and depth such that when the shaft 18 is in the open switch position, to be described later, the contact leaf assemblies 29 are out of contact with the first contact plate 12.
  • the second contact plate 14 is shaped generally as is the first contact plate except that its surface 28 which faces the shaft 18 is flat and contains no depressions like the depressions 24 in contact plate 12.
  • the plate 14 has an array of bores 30 adjacent to its periphery.
  • the switch frame 16 has a rectangular outer configuration when viewed in plan, and is hollow except for the outer wall structure 32.
  • the frame 16 is sandwiched be tween the first and second contact plates and is insulated from the first contact plate 12 by means of an insulating gasket plate 34 which is sandwiched between compression gasket seal elements 36, 38.
  • a compression gasket 40 extends between the frame 16 and the second contact plate 14.
  • Each of the compression gasket elements and the insulating gasket plate 34 is generally flat, as are the top and bottom of the frame 16 and the surfaces of the contact plates facing the top and bottom of the frame 32.
  • the width of the gasket elements and the insulating gasket plate is at least as wide as the contacting surfaces of the frame and may be somewhat Wider provided they do not contact or interfere with the movement of the contact leaf assemblies 20.
  • the first and second contact plates 12, 14 are secured to the frame 32 in liquid tight manner by means of the bolts 42, 44, respectively, which extend through the arrays of bores 36, 22, respectively. It should be noted that a flanged insulating sleeve separates each of the bolts 42 from the contact plate 12, thus, with the insulating plate 34, preventing electrical contact between the frame 16 and the contact plate 12.
  • the switching apparatus in FIG. 1 shows a ganged array of two switches but the view in FIG. 2, is limited to a single switching assembly.
  • the device of FIG. 1 would have a frame which, in essence, is two frames of the above described type joined end to end with common end walls.
  • the frame 32 has, as shown in FIG. 3, oil inlet and outlet lines 48, 50, respectively.
  • the frame end wall 52 shown in FIG. 2 is the common end wall of ganged switching assemblies as shown in FIG. 1, bores 54, 56 are provided to permit the circulation of oil through the various gangs of the apparatus.
  • Each end wall 52, 53 of the frame 16 has an axially 3 liquid-tight seal between the shaft 18 and each bore 60, 62.
  • the shaft 18 carries along its length within the frame 16 a plurality of contact leaf assemblies 20 arranged in side by side, usually abutting relationship and held in fixed position along the shaft by end plates 72, 74 which are pinned or otherwise fixedly secured to the shaft 18.
  • a suitable pneumatically driven piston 76 in an air cylinder assembly 78 having air inlet and outlet control lines 80, 82 drives a throw arm 84.
  • the arm 84 is coupled to a pivot, as at 86, intermediate of its ends and is coupled at one end to the shaft 18 by means of collar 88.
  • Each of the contact leaf assemblies comprises a sleeve 90 which fits slidably over the shaft 18.
  • a contact leaf elelengthwise of the arms and bows towards the adjacent contact plate 12, 14, respectively.
  • a clamp element 102 which is a plate-like element having a bore 104 which adapts the element to be fitted in slidable relationship around the shaft 18 and flanges 106, 108 at each end which extend towards the contact leaf 92.
  • the outer ends of the arm elements of the contact leaf 92 fit under and are prevented from further expansion outwardly by the flanges 106, 108.
  • a pressure bar 110, 112 which is as long as the length of each arcuate part of the arm elements 98, 100, respectively, has a semi-circular transverse cross sectional configuration.
  • One of the bars 110, 112 is fitted against each arcuate part of the arms 98, 100 with the curved surfaces of the parts abutting each other.
  • each of the pressure bars 110, 112 has a bore 114, 116 and 118, 120, respectively, extending inwardly from the fiat surface of the bar which is opposed to the curved surface which contacts the arm elements 98, 100.
  • the bores 114, 116, 118 and 120 extend only part way through the bars 110, 112.
  • a coil spring 122, 124 is fitted between each of the bars 110, 112 of each contact arm assembly on each side of the shaft 18, with each end of the springs being seated in one of the bores 114, 116, 118, 120 so that the springs are dis posed parallel to each other and perpendicular to the bars 110, 112.
  • the springs 122, 124 are under tension and urge the arms of the contact leaf outwardly to the limit imposed by the clamp element 102.
  • the contact surfaces 126 of the plate 12 which are to be in contact with the contact leaf arms 98 when the switch is closed, each have a beveled edge surface 128 at the edge where the arms 98 initially make contact with the surfaces 126.
  • the contact leaf assemblies are assembled by slipping a contact leaf element 92 along the shaft 18 and against a stop plate.
  • the sleeve 90 is then slipped over the shaft 18 and against the leaf element.
  • the pressure bars 110, 112 and springs 122, 124 are then inserted between the upper and lower arms 100, 98.
  • the arms are then compressed and the clamp element is disposed adjacent to the ends of the arms with the flanges of the clamp element retaining the ends of the arms from expanding outwardly.
  • the contact leaf element of the next adjacent contact leaf assembly is then slipped over the shaft 18 and abutted against the clamp element 102 of the previous assembly, and the next leaf assembly is completed as described above.
  • a stop plate is fitted over the shaft 18 and disposed against the clamp element of that assembly, and then is secured to the shaft 18 to prevent movement of the assemblies with respect to the shaft.
  • the switch is shown in the off position. That is, the shaft 18 has been moved to carry the leaf contact surfaces away from the contact surfaces 126 and put them over the depressions 24 in the contact plate 12.
  • Advancement of the piston 76 away from the cylinder 78 results in the shaft 18 moving the contact leaf assemblies 20 into contact with both the contact plate 14, with which they are always in contact, and against the surfaces 126 of the contact plate 12, thus completing the electrical circuit across the two contact plate through the contact leaf assemblies.
  • the beveled surface 128 assists the contact leaf arms to compress slightly as the switch is closed, thus helping assure good mechanical and electrical contact across the switch.
  • the above described switch has high current carrying capabilities, may be oil filled and cooled, requires little bus-connecting hardware, since it is compact and may be mounted close to the electrolytic cell or other device to which it is coupled, is simple to assemble, and easy to operate either as a single unit or with several units ganged together.
  • the long, clean contact area of switches in accordance with this invention presents less resistance, thereby reducing power costs.
  • switches made in accordance with this invention which have each had seven contact leaf assemblies handle 28,000 amperes at an open circuit voltage of 4.5 volts with a drop across the switch in closed circuit of 12 to 30 millivoits. This is equivalent to 1,000 amperes per contact or 2,000 amperes per square inch of cross sectional contact.
  • Electrical switching apparatus comprising (A) a first contact plate, said first contact plate having a flat surface and being rectangularly shaped;

Landscapes

  • Driving Mechanisms And Operating Circuits Of Arc-Extinguishing High-Tension Switches (AREA)
  • Switches Operated By Changes In Physical Conditions (AREA)
  • Contacts (AREA)
US603622A 1966-12-21 1966-12-21 Electrical slider switch Expired - Lifetime US3378653A (en)

Priority Applications (7)

Application Number Priority Date Filing Date Title
US603622A US3378653A (en) 1966-12-21 1966-12-21 Electrical slider switch
BE710565D BE710565A (fr) 1966-12-21 1968-02-09
JP1037368A JPS469097B1 (fr) 1966-12-21 1968-02-17
GB7962/68A GB1202146A (en) 1966-12-21 1968-02-19 Electrical switch
DE19681640010 DE1640010A1 (de) 1966-12-21 1968-02-20 Elektrischer Schalter
FR140742A FR1562227A (fr) 1966-12-21 1968-02-21
NL6802613A NL6802613A (fr) 1966-12-21 1968-02-23

Applications Claiming Priority (6)

Application Number Priority Date Filing Date Title
US603622A US3378653A (en) 1966-12-21 1966-12-21 Electrical slider switch
JP1037368A JPS469097B1 (fr) 1966-12-21 1968-02-17
GB7962/68A GB1202146A (en) 1966-12-21 1968-02-19 Electrical switch
DED0055380 1968-02-20
FR140742 1968-02-21
NL6802613A NL6802613A (fr) 1966-12-21 1968-02-23

Publications (1)

Publication Number Publication Date
US3378653A true US3378653A (en) 1968-04-16

Family

ID=74213548

Family Applications (1)

Application Number Title Priority Date Filing Date
US603622A Expired - Lifetime US3378653A (en) 1966-12-21 1966-12-21 Electrical slider switch

Country Status (7)

Country Link
US (1) US3378653A (fr)
JP (1) JPS469097B1 (fr)
BE (1) BE710565A (fr)
DE (1) DE1640010A1 (fr)
FR (1) FR1562227A (fr)
GB (1) GB1202146A (fr)
NL (1) NL6802613A (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20080121510A1 (en) * 2006-03-13 2008-05-29 Von Kruchten Markus Switchable blower motor resistor for hvac application
CN112002600A (zh) * 2020-08-28 2020-11-27 于杰 一种特高压直流永磁混合断路器

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3336556A (en) * 1963-12-21 1967-08-15 Cts Corp Electrical control

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3336556A (en) * 1963-12-21 1967-08-15 Cts Corp Electrical control

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20080121510A1 (en) * 2006-03-13 2008-05-29 Von Kruchten Markus Switchable blower motor resistor for hvac application
CN112002600A (zh) * 2020-08-28 2020-11-27 于杰 一种特高压直流永磁混合断路器
CN112002600B (zh) * 2020-08-28 2023-09-12 国网江苏省电力有限公司苏州供电分公司 一种特高压直流永磁混合断路器

Also Published As

Publication number Publication date
BE710565A (fr) 1968-08-09
GB1202146A (en) 1970-08-12
DE1640010A1 (de) 1971-02-25
JPS469097B1 (fr) 1971-03-08
NL6802613A (fr) 1969-08-26
FR1562227A (fr) 1969-04-04

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