US3430014A - Modular electric switch - Google Patents

Modular electric switch Download PDF

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Publication number
US3430014A
US3430014A US488548A US3430014DA US3430014A US 3430014 A US3430014 A US 3430014A US 488548 A US488548 A US 488548A US 3430014D A US3430014D A US 3430014DA US 3430014 A US3430014 A US 3430014A
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United States
Prior art keywords
operator
trip
contact
pin
contact carrier
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Expired - Lifetime
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US488548A
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English (en)
Inventor
Robert E Walters
Gerd C Boysen
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Allen Bradley Co LLC
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Allen Bradley Co LLC
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H71/00—Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
    • H01H71/10—Operating or release mechanisms
    • H01H71/50—Manual reset mechanisms which may be also used for manual release
    • H01H71/501—Means for breaking welded contacts; Indicating contact welding or other malfunction of the circuit breaker
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H71/00—Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
    • H01H71/10—Operating or release mechanisms
    • H01H71/12—Automatic release mechanisms with or without manual release
    • H01H71/14—Electrothermal mechanisms
    • H01H71/20—Electrothermal mechanisms with fusible mass
    • H01H71/205—Electrothermal mechanisms with fusible mass using a ratchet wheel kept against rotation by solder
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H71/00—Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
    • H01H71/10—Operating or release mechanisms
    • H01H71/50—Manual reset mechanisms which may be also used for manual release
    • H01H71/62—Manual reset mechanisms which may be also used for manual release with means for preventing resetting while abnormal condition persists, e.g. loose handle arrangement
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H73/00—Protective overload circuit-breaking switches in which excess current opens the contacts by automatic release of mechanical energy stored by previous operation of a hand reset mechanism
    • H01H73/02—Details
    • H01H73/18—Means for extinguishing or suppressing arc
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H73/00—Protective overload circuit-breaking switches in which excess current opens the contacts by automatic release of mechanical energy stored by previous operation of a hand reset mechanism
    • H01H73/22—Protective overload circuit-breaking switches in which excess current opens the contacts by automatic release of mechanical energy stored by previous operation of a hand reset mechanism having electrothermal release and no other automatic release
    • H01H73/30—Protective overload circuit-breaking switches in which excess current opens the contacts by automatic release of mechanical energy stored by previous operation of a hand reset mechanism having electrothermal release and no other automatic release reset by push-button, pull-knob or slide

Definitions

  • the modular electric switch construction includes a base module with a substantially open top for the arc chamber, A contact carrier module is movable located with respect to the arc chamber and carries movable contacts in the chamber; the contact carrier module, with its contacts, being removable and separable from the base module as the contacts pass through the open top of the arc chamber.
  • An arc shield may also form a part of the contact carrier module and pass through the open top of the arc chamber upon carrier module separation from the base module.
  • An integral operator unit module may be located in the base module for operating the contact carrier module; said operator unit module being removable and separable from the base module with or without the contact carrier module.
  • This invention pertains to an electric switch and more particularly a snap-action, manually operated electric switch.
  • switching unit comprising two components, viz, a base unit with fixed contacts and provision for condition sensitive protection, if desired, and a movable contact carrier, which, switching unit can be adapted to variety of operating mechanisms. Furthermore, the switching unit is so designed that varying sized switching units will accommodate a common operating mechanism. Thus, the switching unit with its mechanism can be considered made of modules permitting far more versatility in the manufacturing, sale and use of the electric switch of the invention than previously known.
  • -It is another object of this invention to provide an electric switch which is simple, yet adaptable to various operating mechanisms.
  • a still further object of this invention is to provide an electric switch with a spring operated, over-center, snapoperating mechanism which mechanism will open the switch though the springs should fail while the switch is closed.
  • FIGURE 1 is a perspective, exploded diagram of the switch making up the invention, illustrating the modular construction.
  • FIGURE 2 is a cut-away top view of the switch unit.
  • FIGURE 3 is a cross-sectional, side view of the switch unit set forth in FIG. 2 taken along line 3-3 of FIG- URE 2.
  • FIGURE 4 is a cross-sectional, side view of a particular mechanism and its housing taken along the lines 4-4 of FIGURE 5.
  • the mechanism is shown in an extended position usually associated with a closed contact condition.
  • FIGURE 5 is a cross-sectional end view of the mechanism set forth in FIGURE 4.
  • FIGURE 6 is a cross-sectional, side view of the mechanism set forth in FIGURE 4 and taken along line '66 of FIGURE 5, but shown in a position normally associated with an open contact position.
  • FIGURE 6a is a partial, cross-sectional side view taken along line 6a6a of FIGURE 5.
  • FIGURE 7 shows a cross-sectional, side view of the mechanism of FIGURE 4 taken along line 77 of FIG- URE 5 and in a position normally associated with open contacts in response to a preselected condition, i.e., a tripped position.
  • FIGURE 8 is a partial, cut-away view of the mechanism in FIGURES 47 illustrating the parts thereof which prevent reset of the mechanism from its FIGURE 7 position should certain fault conditions exist.
  • FIGURE 9 shows the parts set forth in FIGURE 8, but with the positioning of these parts should a fault condition exist during operation of condition sensing means such as an over-current delay.
  • FIGURE 10 is a partial, side view of the locking and securing mechanism used for the switch unit in FIGURES 2 and 3.
  • FIGURE 11 is a partial, end view of the mechanism shown in FIGURE 10.
  • FIGURE 1 The modular concept of the electric switch of this invention is best illustrated by FIGURE 1.
  • the switch unit 1 is made from a base 2 and a movable contact carrier 3.
  • the operator 6, with its integral operating means to be described later, is a modular unit adaptable to the switch unit 1.
  • Terminals 9 and 10 for external connection terminate either end of these current-carrying paths and are located at either end of the base 2.
  • Fixed contacts 11 are connected on the one hand by way of current conductor 14 to terminal 9; while on the other hand by way of current conductor 15 and the condition sensitive unit (to be described hereinafter) to terminal 10.
  • the condition sensitive units for protective purposes used in the embodiment of the drawings is best shown in FIGURE 3 and comprises a well-known solder-pot, over-current unit 18. In the conventional manner, an excessive current will liquefy a solder pot within the unit 18, thus releasing a held rotatable ratchet wheel 20.
  • FIGURE 3 best shows the pawl arm 21 which transfers the releasing motion of the ratchet wheel to the slide 23.
  • Compression spring 24 biases the slide 23 to aid in the movement of slide 23.
  • barrier means 27 which have a primary function to prevent any are from moving between adjacent current-carrying paths.
  • Each barrier 27 includes an extended portion 28 intermediate the condition sensitive, solder pot units 18 for shielding therebetween.
  • Vertical openings 29 in the barriers 27 of base 2 (as best shown in FIGURES 1 and 2) permit access to the slide 23 so that motion thereof may be transmitted to the operator 6, to be described later.
  • molded lugs 30 with apertures 31, which lugs 30 provide attachment means.
  • the movable contact carrier 3 includes guide lugs 40 at either end which move within the guide track 41 molded in the base 2.
  • This movable contact carrier 3 completes the switch unit 1 as it fits within arc chambers 35 provided for each of the fixed contacts 11.
  • Each arc chamber 35 is essentially an open topped chamber surrounded by molded portions of the base 2, viz, side walls 36 and transverse walls 37, in combination with the barrier walls 27.
  • Movable contacts 43 are retained within the contact carrier 3 by means of biasing springs 44.
  • Each movable contact 43 is located within U-shaped molded pieces 46 which fit within each arc chamber 35 such that they are below the arc chamber closing walls or are shields 47 of the carrier 3.
  • Structural support for the walls 47 of the carrier 3 is provided at either end by the molded, cross-sectional box construction at 49 and by the triangular support construction at 50 for the intermediate movable contacts 43.
  • the contact carrier 3 is movably biased to a normally open contact position as shown in FIGURE 3 by means of biasing springs shown herein with a cover portion 52.
  • An L-shaped book 54 provides the connection between the movable contact 3 and the operator 6 as will be described later.
  • Utilizing a wall 47 of the movable contact carrier 3 to close the -final wall of the arc chamber 35 provides a most efiicient and expeditious construction with advantages such as hitherto unavailable compact construction and utilization of the switch unit 1 independent from the operator. Moreover, the particular construction of the operator 6 becomes less critical insofar as shielding is concerned because the movable wall 47 accomplishes this end.
  • arc quenching material such as the hot-molded arc-quenching Rosite material (vi z, a water-insoluble binder and an arc-suppressing substance selected from the class consisting of the oxides and hydrates of aluminum and magnesium), manufactured by the Rostone Corporation of Lafayette, Ind.
  • arc quenching material such as the hot-molded arc-quenching Rosite material (vi z, a water-insoluble binder and an arc-suppressing substance selected from the class consisting of the oxides and hydrates of aluminum and magnesium), manufactured by the Rostone Corporation of Lafayette, Ind.
  • the unique construction of the arc chamber in combination with the use of an arc-quenching material for the spaced side walls 36, transverse walls 37 and/ or are chamber closing walls 47 of contact carrier 3 permit reduced switch size plus increased switch reliability and operating life.
  • This operator is an integral unit comprising a housing 57 and an operating mechanism 58, the latter being attached to the former by, for example, screws 59, to form this integral unit.
  • This integral unit is attached as a unit to the switch unit 1 by fastening means which connect the modular units at the lugs 62 on housing 57 of operator 6.
  • the operating mechanism 58 is supported within a U-shaped piece 60 which, in turn, is supported upon the plate '61.
  • a mechanism operator 64 is pivoted upon the U-piece 60 so as to move toggle links 65 and 66, the latter being attached to the contact carrier 3 through pin 67, i.e., the L-shaped hook 54 of the contact carrier engages pin 67.
  • links 65 and 66 each take the form of twin links in this particular embodiment.
  • Springs 70 connect the operator 64 at 71 with the toggle links 65 and 66 by means of pin 72 to establish a pivot point which is better known as the knee of the operating mechanism 58.
  • the movement of the knee at 72 will be a snap action, i.e. an unrestrained, quick movement from, for example, the position of FIGURE 4 to that of FIGURE 5. Because of this action, the movement of the knee at 72 is termed an overcenter, snap action.
  • lever 75 is pivoted at one end about pin 76 and has a cammed surface 77 at the other end.
  • the specific lever 75 shown in the drawings is a bifurcated piece with two arms 78 and therefor two cammed surfaces 77.
  • Torsion spring 79 located about the pin 76 encourages the lever 75 is a direction toward the operating mechanism 58.
  • This biased upward movement of the lever 75 brings the cammed surfaces 77 in contact with the pin 72, i.e., the knee, when the switch is in the position of FIGURE 6.
  • This cammed surface 77 is so designed that when the operator 64 moves from the position of FIGURE 4 to that of FIGURE 6, the knee at 72 will not move when the operator 64 moves immediately beyond the center position. Instead, at a selected position between the center position and the final rest position of the operator 64, the net vectorial force of spring 70 will overcome the opposing or holding force of the cammed surface 77 to thereby release the knee at 72 for the desired snap-action.
  • the same required spring force necessary for switch unit operation has been supplied, but with the use of springs 70 smaller than a mechanism without the restraining force of cammed surfaces 77 and, consequently, a smaller mechanism 58.
  • push buttons 87 and 88 are operatively connected to the operator 64 by way of hifurcated connectors 89 and 90, respectively. Motion of the connectors 89 and 90 is guided in the slots 91 and 92 of the U-piece 60.
  • the position of the mechanism 58 in FIGURE 4 would reflect the On or closed position between the movable contacts 43 and the fixed contacts 11 since the toggle links 65 and 66 are extended so as to move the contact carrier 3 in a downward or extended position.
  • the operating mechanism 58 as shown in FIGURE 6 reflects the Off or contact open position of the movable contacts 43 and the fixed contacts 11 since the toggle links 65 and 66 are in a retracted position.
  • the mechanism 58 as shown in FIGURES 4-7, further aids the contact opening should springs 70 fail by locating the knee at 72 beyond the over-center position in a partially retracted position during the On position (FIGURE 4). Therefore, before the knee at 72 can move to the retracted position of FIGURE 6, it must first go through an extended position which will necessarily further compress the springs 44 and 52. This added potential energy ensures return of the knee at 72 to the FIGURE 6 position.
  • the operating mechanism 58 respond to the slide 23 of the switch unit 1 when predetermined conditions exists.
  • This retraction of the movable contact carrier 3 is accomplished through the movement of the trip lever 96 which is pivoted on pin 97 (attached then to the operator housing 57) and is pivotally connected to the toggle link 65 at 98.
  • trip pin 98 The rotation of trip pin 98 is in response to movement of the slide 23 which, in turn, pivots the relay actuator 101 upon its pivot pin 102.
  • the motion of relay actuator 101 is transferred to the trip pin 98 through an extension of the latter in the form of trip pin arm 103.
  • Tension spring 104 biases the trip pin arm 103 with respect to the relay actuator 101 to aid in the reset operation as will be described hereinafter.
  • the resetting sequence for the mechanism 58 i.e., moving the mechanism '58 from the position of FIGURE 7 to that of FIGURE 6, also resets the overload unit 18 as the slide 23 returns back to the position of FIGURE 3.
  • the common reset action is begun through movement of the operator 64 so as to pivot the trip lever 96 about the pivot point 97. It is noted that in resetting the mechanism '58, the portion of the trip lever 96 which is to be restrained 'by contact with the trip pin 98, be moved past its position of FIGURE 6 before the trip pin 98 completes its rotation to the restraining position of FIGURE 6.
  • FIGURE 9 shows the operator 64 as it nears its position of FIGURE 6 to begin reset and rotation of trip pin 98 without the latter interfering with the passage of trip lever 96 thereby.
  • the reset of mechanism 58 is elfected by the return of the trip pin 98 to its restraining position of FIGURE 6 as the relay actuator 101 is pivoted in a clockwise direction upon pin 102 (as viewed in FIGURE 7), permitting the tension spring 104 to pull the trip pin arm 103 and, consequently, trip pin 98 along until the FIGURE 6 position is reached.
  • the clockwise motion of the relay actuator 101 returns the slide 23 to its position of FIGURE 3 to thereby reset the condition sensitive portion, i.e., over-current unit 18.
  • the movable contact carrier 3 may remain in a contact closed position, i.e., the movable contacts '43 engaging the fixed contacts of 11, after slide 23 has moved the relay actuator 101 so as to release the trip lever 96. Since it is undesirable to reset the operating mechanism 58 under such conditions, a locking device has been incorporated.
  • trip lock lever 110 Freely pivoted upon the pin 102, which carries the relay actuator 101, is trip lock lever 110.
  • a spring 111 biases the trip lock lever toward the trip pin arm 103 at one end so that the tab 114 abuts the trip pin arm 103.
  • trip lock lever 110 extends through the support plate 61 as finger 115.
  • the relationship and operation of the relay actuator 101, the trip pin arm 103 and trip pin 98 with the trip lock lever 110 is illustrated in FIGURES 8 and 9.
  • FIGURE 8 shows the relationship when the operating mechanism 58 is in the position of FIGURES 4 and 6, viz, the tab 114 of trip lock lever 110 abuts the trip pin arm 103 so as to prevent a clockwise rotation of the trip lock lever 110 and contact between the finger 115 and the movable contact carrier 3.
  • the uppermost position of contact carrier 3 is shown in FIGURES 8 and 9.
  • trip lock lever 110 This clockwise motion of trip lock lever 110 is limited by its abutment with the support plate 61 which brings the tab 114 into line with the previously abutted portion of the trip pin arm 103 and thereby blocks any counterclockwise or reset motion of the trip pin arm 103.
  • the tension spring 104 With the trip pin arm 103 blocked, the tension spring 104 is unable to pull the trip -pin arm and attached trip pin 98 to a position so as to restrain trip lever 96 when the arm extension 107 of operator 64 rotates relay actuator 101 in its counterclockwise, resetting motion.
  • Tension spring 112 attached between the operator 64 and pin 76, aid in returning the operator 64 back to the position of FIGURE 7 should the trip lock lever 110 prevent reset of the operating mechanism 58.
  • the trip lock lever 110 can be removed from this blocking position only if the movable contact carrier 3 returns to its normal open position as shown in FIGURE 3 and schematically in FIGURES 8 and 9 to thereby abut finger 115 and rotate the trip lock lever 110 in a counterclockwise direction as viewed in FIGURE 9. Thus, resetting of the operating mechanism 58 is not possible when the movable contacts 43 and fixed contacts 11 remain closed.
  • the contact carrier 3 includes lug 119 with detent 120.
  • Pivoted at 121 on the U-piece 60 is the lock arm 122 which engages detent 120 for retaining the contact carrier 3 in the position shown.
  • Extension lock arm 124 includes slot 125 in which finger 126 of lock arm 122 slides. The slot 125 is so designed that reciprocal motion of the extension lock arm 124 will cause the lock arm 122 to pivot about 121, i.e., move the lock arm into and out of the locking position with respect to the detent 120.
  • Flat spring 127 located between pivoted lock arm 122 and extension lock arm 124 maintains the spacing therebetween and creates sufiicient friction therebetween to maintain selected positions of said arms.
  • this structure used to retain a contact carrier 3 in an open position, achieves this end through movement of the integral locking mechanism, viz, lock arm 122 and extension lock arm 124
  • Additional locking through the use of independent means such as a paidlock passed through the aperture 128when the lock arm is in position shown by dotted lines in FIGURE 11- serve to secure the already locked switch, contrary to the usual operation which requires the use of external padlock through the aperture 128 for locking.
  • This feature means that the operator can accomplish the locking function when he so intends and not during that most dangerous time interval during which the operator searches for the padlock.
  • Various sized independent securing means may be accommodated through the addition to the slot 125 of the slot portion 129 which extends substantially parallel to the reciprocal motion of extension lock arm 124.
  • interlock 130' with notch 131 is pivotally mounted on pivot 121 so as to intercept pin 132 of extension lock arm 124. Finger 133 on interlock 130 connects the operator 164 with the interlock 130'.
  • operator 64 moves clockwise (FIGURE 11) to displace contact carrier 3 from the position of FIGURES 10 and 11, interlock 130 is also moved until notch 131 intercepts pin 132 to prevent locking movement of extension arm 124.
  • This inability to move the extension arm 124 not only prevents faulty operation, but also suggests to the operator that the contact carrier 3 is not in its uppermost or contact open position.
  • base means including an arc chamber with a substantially open top
  • said carrier means comprising arc shield means which substantially close said chamber through said open top and thereby confine any arc to said chamber
  • said base means comprise a plurality of said opened top chambers side by side with said first contact means in each chamber,
  • barrier means separate said chambers
  • said material for said base means comprises a water-insoluble binder and an arc-suppressing substance selected from the class consisting of oxides and hydrates of aluminum and mag nesium.
  • a modular electric switch construction comprising:
  • a base module including 1) an arc chamber with a substantially open top
  • a contact carrier module movably located at least in part in said chamber including,
  • said base means comprise a plurality of opened top chambers side by side with first contact means in each chamber
  • barrier means separate said chambers
  • said contact carrier module located at least in part 3,129,307 4/ 1964 De Vargas 200-149 in each said chamber to support second contact 3,170,054 2/1965 Lawr nc t 1 ZOO- 147 means in each chamber- 3,184,574 5/1965 Dennison ZOO-466 7.
  • said carrier module comprise arc shield means FOREIGN PATENTS which substantially close said chamber through said open top and thereby confine any are to said cham- 1,050,875 2/1959 G n ber,

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  • Arc-Extinguishing Devices That Are Switches (AREA)
  • Breakers (AREA)
  • Push-Button Switches (AREA)
US488548A 1965-09-20 1965-09-20 Modular electric switch Expired - Lifetime US3430014A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US48854865A 1965-09-20 1965-09-20

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US3430014A true US3430014A (en) 1969-02-25

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Application Number Title Priority Date Filing Date
US488548A Expired - Lifetime US3430014A (en) 1965-09-20 1965-09-20 Modular electric switch

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US (1) US3430014A (US06521211-20030218-C00004.png)
BE (1) BE687037A (US06521211-20030218-C00004.png)
DE (1) DE1590037A1 (US06521211-20030218-C00004.png)
GB (1) GB1171297A (US06521211-20030218-C00004.png)
NL (1) NL6613284A (US06521211-20030218-C00004.png)
SE (3) SE335168B (US06521211-20030218-C00004.png)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3590180A (en) * 1970-02-06 1971-06-29 Square D Co Manually operated toggle-acting switch having a means for preventing assembly of the switch with the contacts of the switch in a circuit-closing condition
US3591745A (en) * 1970-02-06 1971-07-06 Square D Co Manually operated toggle acting switch having a job function lever
US3603755A (en) * 1968-04-13 1971-09-07 Pierluigi Ranzanigo Power electric switch
US3604874A (en) * 1970-02-06 1971-09-14 Square D Co Movable contact guiding and actuating mechanism in a manually operated electric switch
EP0003236A1 (de) * 1978-01-19 1979-08-08 Siemens Aktiengesellschaft Niederspannungs-Leistungsschalter mit durch Trennwände unterteiltem Isolierstoffgehäuse
US5026233A (en) * 1990-04-13 1991-06-25 Westinghouse Electric Corp. Locking nut insert in a screw-nut arrangement
US5281937A (en) * 1992-07-14 1994-01-25 Fasco Industries, Inc. Electromagnetic contactor and method for making same

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1135130A (en) * 1914-01-13 1915-04-13 Thomas E Murray Protective switch-box.
US2768264A (en) * 1953-04-28 1956-10-23 Rostone Corp Arc-suppressing device
DE1050875B (US06521211-20030218-C00004.png) * 1956-03-14 1959-02-19
US3129307A (en) * 1960-04-13 1964-04-14 Vargas Jose Munoz De Device for accelerating the disconnection of electric switches and for extinguishing their arc
US3170054A (en) * 1961-06-09 1965-02-16 Allen Bradley Co Electromagnetic switch
US3184574A (en) * 1962-02-26 1965-05-18 Cutler Hammer Inc Electric switch including housing and contact retaining means

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1135130A (en) * 1914-01-13 1915-04-13 Thomas E Murray Protective switch-box.
US2768264A (en) * 1953-04-28 1956-10-23 Rostone Corp Arc-suppressing device
DE1050875B (US06521211-20030218-C00004.png) * 1956-03-14 1959-02-19
US3129307A (en) * 1960-04-13 1964-04-14 Vargas Jose Munoz De Device for accelerating the disconnection of electric switches and for extinguishing their arc
US3170054A (en) * 1961-06-09 1965-02-16 Allen Bradley Co Electromagnetic switch
US3184574A (en) * 1962-02-26 1965-05-18 Cutler Hammer Inc Electric switch including housing and contact retaining means

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3603755A (en) * 1968-04-13 1971-09-07 Pierluigi Ranzanigo Power electric switch
US3590180A (en) * 1970-02-06 1971-06-29 Square D Co Manually operated toggle-acting switch having a means for preventing assembly of the switch with the contacts of the switch in a circuit-closing condition
US3591745A (en) * 1970-02-06 1971-07-06 Square D Co Manually operated toggle acting switch having a job function lever
US3604874A (en) * 1970-02-06 1971-09-14 Square D Co Movable contact guiding and actuating mechanism in a manually operated electric switch
EP0003236A1 (de) * 1978-01-19 1979-08-08 Siemens Aktiengesellschaft Niederspannungs-Leistungsschalter mit durch Trennwände unterteiltem Isolierstoffgehäuse
US5026233A (en) * 1990-04-13 1991-06-25 Westinghouse Electric Corp. Locking nut insert in a screw-nut arrangement
US5281937A (en) * 1992-07-14 1994-01-25 Fasco Industries, Inc. Electromagnetic contactor and method for making same

Also Published As

Publication number Publication date
SE335168B (US06521211-20030218-C00004.png) 1971-05-17
SE357467B (US06521211-20030218-C00004.png) 1973-06-25
GB1171297A (en) 1969-11-19
SE357465B (US06521211-20030218-C00004.png) 1973-06-25
BE687037A (US06521211-20030218-C00004.png) 1967-03-01
DE1590037A1 (de) 1970-04-16
NL6613284A (US06521211-20030218-C00004.png) 1967-03-21

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