US3794792A

US3794792A - Switchgear with single drive to both charge closing spring and rack contact carrier

Info

Publication number: US3794792A
Application number: US00282597A
Authority: US
Inventors: G Wilson
Original assignee: ITE Imperial Corp
Current assignee: ABB Inc USA
Priority date: 1972-08-21
Filing date: 1972-08-21
Publication date: 1974-02-26
Anticipated expiration: 1991-02-26
Also published as: CA980392A

Abstract

Truck mounted miniaturized switchgear adapted to be removably placed in a switchboard for connection to busses located in the switchboard comprising a truck frame and circuit interrupter elements mounted on a second frame telescopingly movable with respect to the truck frame. The circuit interrupter elements are opened by a spring on the occurrence of predetermined circuit condition and the removal of a retaining latch structure. The spring is recharged after opening and may be automatically recharged while the contacts are closed in preparation for the next opening. A rotatable lever or crank is used to charge the spring and motor means may be provided for operating said rotatable lever. The contacts are trip free in that the spring may be moved toward discharge position while it is in the process of being charged. The same motor with other connections is utilized to drive the racking member which moves the telescoping frame carrying the circuit interrupter elements with respect to the truck frame.

Description

United States Patent [191 Wilson 1 1 Feb. 26, 1974 [5 1 SWITCHGEAR wmi SINGLE DRIVE To BOTH CHARGE CLOSING SPRING AND RACK CONTACT CARRIER [75] lnventor: George A. Wilson, Pineville, Pa.

[73] Assignee: l-T-E Imperial Corporation,

Philadelphia, Pa.

22 Filed: Ali 3151,1972

211 Appl. No.: 282,597

52 s. Cl. 200/153 sc, 185/40 R [51] Int. Cl. H01h 3130 58 Field ofSearch.. ..200/l53 so, 34; 185/40 R,

McCloud 200/34 X Primary Examiner-Robert K. Sc haefer Assistant Examiner-Robert A. Vanderhye Attorney, Agent, or Firm-Ostrolenk, Faber, Gerb & Soffen [57] ABSTRACT Truck mounted miniaturized switchgear adapted to be removably placed in a switchboard for connection to busses located in the switchboard comprising a truck frame and circuit interrupter elements mounted on a second frame telescopingly movable with respect to the truck frame. The circuit interrupter elements are opened by a spring on the occurrence of predetermined circuit condition and the removal of a retaining latch structure. The spring is recharged'after opening and may be automatically recharged while the contacts are closed in preparation for the next open 1 ing. A rotatable lever or crank is used to charge the spring and motor means may be provided for operating said rotatable lever. The contacts are trip free in that the spring may be moved toward discharge position while it is in the process of being charged The samemotor with other connections is utilized to drive the racking member which moves the telescoping frame carrying the circuit interrupter elements with respect to the truck frame.

7 Claims, 44 Drawing Figures F 4 I72 g MATULATfO M0t0/N6430 fife X32 Z/ 20/ cram/v l wyza PATENTEDFEBPE 29m sum 02 or'21 PATENTEDFEB 26 mm sum 05 or 21 YE W.

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Claims

1. In switchgear; a first frame and a second frame; said first frame being reciprocally movable with respect to said second frame between two limiting positions; driving means on said second frame for effecting said reciprocal motion of said first frame with respect to said second frame; said driving means including a rotatable shaft carried by said second frame and extending normal to the path of reciprocal movement of said first frame with respect to said second frame; said shaft being unidirectionally rotatable; and a connection between said shaft and said first frame driving said first frame in one direction when said first frame is at one limiting position and in an opposite direction when said first frame is at the other end of said limiting positions; said first frame carrying a movable contact and a complementary contact; a closing spring for driving said movable contact into engagement with said complementary contact; means for charging said closing spring; a connection from said first mentioned shaft and said closing spring for charging said closing spring, said first mentioned shaft being operable on the discharge of said spring to recharge said spring; means for defeating the connection between said shaft and said frame to maintain said frame at one of the said limiting positions for reciprocal movement.

2. The switchgear of claim 1 in which said spring being movable between a charged condition and a discharged condition; a member connected to said spring and movable in a first direction to charge said spring; said member being movable by said spring when said spring moves from a charged to a discharged position; a first latch; said first latch being engageable with said member to retain said member and said spring in position when said spring is in charged condition; and driving connections between said member and said movable contact; said member when moving from the charged to the discharged positions of said spring and member acting through said driving connections to drive said movable contact into engagement with said complementary contact; a second latch located in and acting upon a portion of said driving connections; said second latch acting on said driving connections to maintain said movable contact in engagement with said complementary contact upon initial engagement thereof; means responsive to conditions including current conditions through said contacts to release said second latch and disestablish the driving connections between said member and said movable contact and to permit the first means to drive said contact to open position; said second latch, on separation of the movable contact from the stationary contact, reengaging said portion of said driving connection and restablishing tHe driving connection between said member and said movable contact; and means for charging said spring when the spring and member have been moved to the discharged condition of said spring; said spring charging means including a rotatably mounted lever pivotally connected, at a point remote from the point of rotation thereof, to said member; rotation of said lever in one direction moving said member in a direction to charge said spring; said first latch, on completion of said movement of said member engaging said portion of said member and retaining said member and spring in charged condition.

3. The switchgear of claim 2 in which said spring and member are movable from the discharged condition to the charged condition thereof while the contacts are engaged and thp movable contact is supported in engaged position by the engagement of said second latch with said driving connection, said spring and member being also movable from the discharged condition to the charged condition thereof while the contacts are disengaged.

4. The switchgear of claim 3 in which a further reciprocally rotatable shaft extends on an axis substantially normal to the axis of said lever; linkage connecting said reciprocally rotatable shaft to said lever; rotation of said shaft acting through said linkage to rotate said lever.

5. The switchgear of claim 4 in which a motor is provided; the first mentioned unidirectional shaft being driven by said motor; a rotatably mounted camming lever connected to said linkage for said first mentioned lever and operable on rotation of said camming lever to rotate said first mentioned lever to drive said member and spring from a discharged to a charged condition thereof; a crank arm on said first mentioned shaft and a cam roller on said crank arm engageable with said camming lever.

6. The switchgear of claim 5 in which the motor is unidirectional and means are provided responsive to the movement of the member and spring to charged condition to halt said motor; said first mentioned unidirectional shaft and motor being thereby halted after a single revolution of said first mentioned unidirectional shaft and cam roller carrying arm; said first mentioned unidirectional shaft and cam roller carrying arm being halted in a position where the cam roller is out of engagement with the camming lever; said member and spring being free to move to the discharged condition thereof on and before completion of said single revolution of said first mentioned unidirectional shaft and cam roller carrying arm.

7. In switchgear, a movable contact and a complementary contact; first means for driving said movable contact into engagement with the complementary contact and second means for driving said movable contact out of engagement with said complementary contact; said first means comprising a closing spring; said spring being movable between a charged condition and a discharged condition; a member connected to said spring and movable in a first direction to charge said spring; said member being movable by said spring when said spring moves from a charged to a discharged position; a first latch; said first latch being engageable with said member to retain said member and said spring in position when said spring is in charged condition; and driving connections between said member and said movable contact; said member when moving from the charged to the discharged positions of said spring and member acting through said driving connections to drive said movable contact into engagement with said complementary contact; a second latch located in and acting upon a portion of said driving connections; said second latch acting on said driving connections to maintain said movable contact in engagement with said complementary contact upon initial engagement thereof; means responsive to conditions including current conditions though said contacts to release said secOnd latch and disestablish the driving connections between said member and said movable contact and to permit the first means to drive said contact to open position; said second latch, on separation of the movable contact from the stationary contact, reengaging said portion of said driving connection and re-establishing the driving connection between said member and said movable contact; and means for charging said spring when the spring and member have been moved to the discharged condition of said spring; said spring charging means including a rotatably mounted lever pivotally connected, at a point remote from the point of rotation thereof, to said member; rotation of said lever in one direction moving said member in a direction to charge said spring; said first latch, on completion of said movement of said member engaging said portion of said member and retaining said member and spring in charged condition; a reciprocally rotatable shaft extends on an axis substantially normal to the axis of said lever; linkage connecting said reciprocally rotatable shaft to said lever; rotation of said shaft acting through said linkage to rotate said lever; a motor; an additional shaft driven by said motor; a rotatably mounted camming lever connected to said linkage for said first mentioned lever and operable on rotation of said camming lever to otate said first mentioned lever to drive said member and spring from a discharged to a charged condition thereof; a crank on said additional shaft and a cam roller on said crank arm engageable with said camming lever; said motor being unidirectional, and means responsive to the movement of the member and spring to charged condition to halt said motor; said shaft and motor being thereby halted after a single revolution of said shaft and cam roller carrying arm; said shaft and cam roller carrying arm being halted in a position where the cam roller is out of engagement with the camming lever; said member and spring being free to move to the discharged condition thereof on and before completion of said single revolution of said shaft and cam roller carrying arm, said switchgear having a first frame; said first frame carrying said contacts, a part of said driving connections and said first mentioned contact opening means; said switchgear also having a second frame, said second frame carrying said spring and its associated member and the remainder of said driving connections, said first frame being reciprocally movable into and out of said second frame; driving means on said second frame connected to said first frame for effecting said reciprocal motion of said first frame; said motor being mounted on said second frame and means for establishing a driving operation between said motor and said driving means.