Circuit breaker with wide opening contacts
阅读：969发布：2021-05-12
专利汇可以提供Circuit breaker with wide opening contacts专利检索，专利查询，专利分析的服务。并且The circuit breakers involved are of the type having a contact arm pivoted between its ends and operable by a manually erected toggle for closing the contacts. A bell-crank, pivoted to one end of the contact arm, has a latch arm restrained by an over-current latch also carried by the contact arm. That type of circuit breaker is given increased interrupting capability by modification of its component parts, especially the handle and the linkage operated by the handle, to produce greatly increased contact separation.，下面是Circuit breaker with wide opening contacts专利的具体信息内容。
1. A circuit breaker of the type having an elongated contact arm pivoted between its first and second ends and operable in a central plane perpendicular to the pivoted axis thereof, a movable contact carried by said first end of said contact arm and a companion contact engageable by said movable contact in the closed condition of the circuit breaker, a bell-crank having a latch arm and an operating arm, and means forming a first pivot between said arms of said bell-crank and carrying the bell-crank on said second end of said contact arm, overcurrent release means carried by said contact arm and including a latch engageable by the latch arm of said bell-crank for arresting said bell-crank against pivoting relative to said contact arm, said bell-crank and said contact arm and said overcurrent latch forming a latched unit in the closing and closed condition of the contacts, a pushoff spring biasing said contact arm away from said companion contact, a manual operator having a stationary second pivot and movable between an ''''ON'''' position and an ''''OFF'''' position for closing and opening the contacts, said push-off spring also biasing the manual operator toward its ''''OFF'''' position when the contact arm is in its open position, a connecting link, a third pivot connecting said connecting link to said manual operator, a fourth pivot connecting said connecting link to the operating arm of said bell-crank, all of said pivots having parallel axes perpendicular to said central plane, said manual operator and said connecting link forming a toggle for driving said latched unit in the contact-closing direction and for holding the contacts closed subject to control by said latch, characterized in that said operating arm of said bell-crank includes side portions disposed at opposite sides of said contact arm and a bridge portion interconnecting and unifying said side portions, both of said side portions bearing said fourth pivot, and said side portions acting on said contact arm via said first pivot means symmetrically with respect to said central plane, further characterized in that said latch arm of the bell-crank is free of transveRse structure that could impede movement thereof alongside the contact arm, for accommodating relatively wide separation of said movable contact from said companion contact.
2. A circuit breaker as claimed in claim 1, wherein said connecting link comprises side portions straddling the side portions of the bell-crank and a bridge portion interconnecting and unifying the side portions of the connecting link and wherein the side portions of said connecting link are free of transverse structure that could impede collapsing movement of said connecting link and said bell-crank as said latch arm moves into position alongside the contact arm when said manual operator is in its ''''ON'''' position, thereby allowing travel of the contact arm to its full open position.
3. A circuit breaker as claimed in claim 1, wherein said manual operator comprises side portions straddling the side portions of the connecting link, both of said side portions of the connecting link bearing said third pivot, said side portions of said manual operator bearing on said third pivot symmetrically with respect to the central plane for applying a balance operating force to said connecting link, and wherein the side portions of said manual operator are free of transverse structure that could impede collapsing movement of said manual operator and said connecting link when the movable contact moves to its fully open position, following release of said bell-crank by the over-current release means, thereby allowing return of said manual operator to its ''''OFF'''' position.
4. A circuit breaker of the type having an elongated contact arm pivoted between its first and second ends and operable in a central plane perpendicular to the pivotal axis thereof, a movable contact carried by said first end of said arm and a companion contact engageable by said movable contact in the closed condition of the circuit breaker, a bell-crank having a latch arm and an operating arm, a first pivot between said arms of said bell-crank and carrying the bell-crank on said second end of said contact arm, over-current release means carried by said contact arm and including a latch engageable by said latch arm of said bell-crank for arresting said bell-crank against pivoting relative to said contact arm, said bell-crank and said contact arm and said over-current latch forming a latched unit in the closing and closed condition of the contacts, a push-off spring biasing said contact arm away from said companion contact, a manual operator having a stationary second pivot and movable between an ''''ON'''' position and an ''''OFF'''' position for closing and opening the contacts, a connecting link, a third pivot connecting said connecting link to said manual operator, a fourth pivot connecting said connecting link to said operating arm of said bell-crank, all of said pivots having parallel axes, said manual operator and said connecting link forming a toggle for driving said latched unit in the contact-closing direction and for holding the contacts closed subject to control by said latch, characterized in that said manual operator and said connecting link and said bell-crank individually comprise side portions operable in respective planes parallel to the central plane and symmetrical thereto, the side portions of said bell-crankbeind disposed at opposite sides of said contact bell-brank being at said first pivot, the side portions of said connecting link straddling said operating arm of said bell-crank, and the side portions of said manual operator straddling said connecting link at said third pivot, so as to enable the manual operator in moving toward its ''''ON'''' position to apply a symmetrical driving force to the bell-crank.
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