US1874797A - No-volt tripping mechanism for electrical switches - Google Patents

No-volt tripping mechanism for electrical switches Download PDF

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Publication number
US1874797A
US1874797A US422388A US42238830A US1874797A US 1874797 A US1874797 A US 1874797A US 422388 A US422388 A US 422388A US 42238830 A US42238830 A US 42238830A US 1874797 A US1874797 A US 1874797A
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US
United States
Prior art keywords
armature
lever
switch
winding
volt
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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
US422388A
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English (en)
Inventor
Pavitt Frederick James
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Individual
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Individual
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Filing date
Publication date
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Publication of US1874797A publication Critical patent/US1874797A/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
    • H01H83/00—Protective switches, e.g. circuit-breaking switches, or protective relays operated by abnormal electrical conditions otherwise than solely by excess current
    • H01H83/12—Protective switches, e.g. circuit-breaking switches, or protective relays operated by abnormal electrical conditions otherwise than solely by excess current operated by voltage falling below a predetermined value, e.g. for no-volt protection

Definitions

  • This invention relates to, and has for its object the provision of improvements in, control apparatus for electric circuits.
  • the invention consists broadly in the combination of a winding, an armature controlled thereby, a switch having an operative position at which said winding is adapted to be energized, and an interlock between said switch and said armature whereby said armature is held at the attracted position independently of said winding until said switch is actuated to the operative position whereupon said armature is left free to move from said attracted position upon said winding becoming de-energized independently of said switch.
  • Figure 2 is a side elevation of the same looking from the right of Figure 1.
  • the numeral 1 designates a shaft on which are mounted the moving elements of a line switch.
  • This shaft has an arm 2 rigidly mounted thereon and a lever 3 oscillatably mounted thereon.
  • the lever 3 is biassed in a counter clockwise direction (according to Figure 2) by means of a spring 4 having one end secured to an end of said lever and the other end secured to a fixed pivot 5, and by virtue of this bias the other end of said lever presses against a laterally projecting pin 6 carried by said arm 2 and tends thereby to move the switch to the open position.
  • the switch when closed (as in the drawing) is retained, in opposition to this bias by means of a catch 7 pivotable about a pivot 7a and formed as shown so as to be adapted to engage a second lateral pin 8 on said arm 2 and thereby positively retain said arm 2 at the switch closed position until moved in a counter clockwise direction.
  • a no-volt winding 9 Connected in the circuit controlled by said switch is a no-volt winding 9 having an associated armature 10 pivoted about a fixed pivot 11.
  • a lug 10a extends rigidly from said armature beyond said pivot 11 and at its end is pivotally connected at 12a to a longitudinally slidable rod 12.
  • This rod 12 is biassed by means of a light spring 13 in an upward direction (according to the drawing) and thus the armature 10 is permanently biassed from the attracted position shown in full lines to the unattracted position shown in dotted lines.
  • the lower end of each rod 12 is of reduced section and bent over at a right angle, and the bent over portion engages under one end of a bell crank lever 14 oscillatable about the pivot 5.
  • the other end of said lever 14 is formed with a shoulder which when the armature 10 is at the attracted position supports the bent over end of a tripping lever 15 pivoted about a pivot 16.
  • the rod 12 moves upwards thereby rotating the lever 14 in a counter clockwise direction so that the end of the lever 15 is released.
  • This end of said lever 15 is much further than the other end from the pivot 16 and therefore upon release said lever 15 rotates by gravity and/or by spring bias round its pivot in a counter clockwise direction.
  • the remote end of said lever 15 carries an enlarged hammer head 17 which upon said lever rotating as stated is adapted to strike the catch 7 a hammer blow thereby knocking it round in a counter clockwise direction and releasing the arm 2 whereupon the switch opens under the influence of the spring 4, and a torsion spring acting on the switch shaft 1 through the medium of the pin 6.
  • an overload device may also be provided adapted upon the occurrence of M overload to effect the rotation of the lever 14 in a counter clockwise direction and thereby trip the catch 7 and effect the opening of the switch in the same manner as in the case of voltage failure.
  • a control apparatusfor electric circuits comprising a winding, an armature controlled thereby, a moving element having an opera-' tive position at which said winding is adapted I to be energized, an interlock between said element and said armature whereby said armature is held at the attracted position in-.
  • a control apparatus for electric circuits comprising a winding, an armature controlled thereby, a moving element having an operative position at which said winding is adapted to be energized, an interlock between said element and said armature whereby said armature is held at the attracted position independently of said winding until said element is actuated to the operative position whereupon said armature is left free to move from said attracted position upon said winding becoming de-energized independently of the movement of said element, a latch adapted to retain said element at said operative position means whereby upon release of said armature said latch is adapted to be tripped for.
  • a control apparatus for electric circuits comprising a winding, an armature controlled thereby, a moving element having an operative position at which said winding is adapted to be energized, an interlock between said element and said armature whereby said armature is held at the attracted position 1ndependently of said winding until said element is actuated to the operatlve position whereupon said armature is left free to move from said attracted position upon said Winding becoming deeenergized independently of the movement of said element, a latch adapted to retain said element at said operative position, a biased tripping means, acatch retaining said means and adapted to release said means upon movement of said armature, said tripping means upon release being adapted to trip said latch with a hammer blow, thereby allowing the element to move to the inoperative position.

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  • Driving Mechanisms And Operating Circuits Of Arc-Extinguishing High-Tension Switches (AREA)
US422388A 1929-01-25 1930-01-21 No-volt tripping mechanism for electrical switches Expired - Lifetime US1874797A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2662/29A GB328560A (en) 1929-01-25 1929-01-25 Improvements in no-volt overload tripping mechanism for electrical switches

Publications (1)

Publication Number Publication Date
US1874797A true US1874797A (en) 1932-08-30

Family

ID=9743544

Family Applications (1)

Application Number Title Priority Date Filing Date
US422388A Expired - Lifetime US1874797A (en) 1929-01-25 1930-01-21 No-volt tripping mechanism for electrical switches

Country Status (6)

Country Link
US (1) US1874797A (nl)
BE (1) BE328560A (nl)
DE (1) DE556665C (nl)
FR (1) FR688840A (nl)
GB (1) GB328560A (nl)
NL (1) NL31465C (nl)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2472588A (en) * 1944-11-02 1949-06-07 Gen Electric Electric switch
US3611215A (en) * 1970-08-21 1971-10-05 Westinghouse Electric Corp Circuit breaker includng improved undervoltage trip means
US3675177A (en) * 1969-10-27 1972-07-04 Ellenberger & Poenigen Gmbh Safety switch

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2472588A (en) * 1944-11-02 1949-06-07 Gen Electric Electric switch
US3675177A (en) * 1969-10-27 1972-07-04 Ellenberger & Poenigen Gmbh Safety switch
US3611215A (en) * 1970-08-21 1971-10-05 Westinghouse Electric Corp Circuit breaker includng improved undervoltage trip means

Also Published As

Publication number Publication date
GB328560A (en) 1930-04-25
FR688840A (fr) 1930-08-29
DE556665C (de) 1932-08-12
NL31465C (nl)
BE328560A (nl)

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