Mutual locking device for electromagnetic contactors
AssigneeFuji Electric Co., Ltd.
InventorTakato Hirota
Life of this patent
Estimating the term…
Abstract
A pair of closed contacts having moving contacts (27A), (27B) and fixed contacts (25A), (26A), (25B), (26B) are provided in a mutual locking device (3) and excitation circuits of two electromagnetic contactors which are inversely connected to respective closed contacts to effect electrical interlocking. The moving contacts (27A), (27B) are held by respective levers (36A), (36B) interlocked with driven members (5A), (5B) to be driven by corresponding moving contact supports of the electromagnetic contactors and opened when the electromagnetic contactor closes. Thus, electrical interlocking may be simultaneously effected using a mutual locking device for mechanically preventing two electromagnetic contactors reversibly connected from simultaneously closing.
Claims17
A mutual locking device for electromagnetic contractors, comprising:
- a housing;
- a pair of driven members, disposed in said housing, to be driven by corresponding moving contact supports of two electromagnetic contractors which are reversibly connected, said driven members having tilted edge faces at one end so as to form a cavity between said driven members and a backing member fixed to said housing and protruding from said housing towards the ends of said driven members having said tilted edge faces;
- locking means, disposed in said cavity, for controlling the operations of said driven members so as to prevent the simultaneous closing of said electromagnetic contactors;
- and
- a pair of switches, disposed in said housing, each comprising a moving contact connected by a lever interlocked with one of said driven members, and fixed contact facing said moving contact, wherein said moving contact provides an electrical connection between said fixed contacts when said one of said driven members to which said moving contact is connected is in a position at which the corresponding electromagnetic contactor is open.
A mutual locking device for electromagnetic contactors, comprising:
- a housing;
- first shifting means, disposed in said housing, for shifting to one of two positions within said housing in response to corresponding movement of a contact support of a first electromagnetic contactor which is connected thereto;
- second shifting means, disposed in said housing, for shifting to one of two positions within said housing in response to corresponding movement of a contact supports of a second electromagnetic contactor which is connected thereto, said first shifting means and said second shifting means having tilted edge faces at one end so as to form a cavity between said first shifting means, said second shifting means, and a backing member fixed to said housing and protruding from said housing towards the end of the first and second shifting means having said tilted edge faces;
- locking means, disposed in said cavity, for controlling the operations of the first and second shifting means so as to prevent the simultaneous closing of the first and second electromagnetic contactors;
- and
- switching means, disposed in said housing, for electrically disconnecting said first electromagnetic contactor when said second shifting means is shifted in response to a closing of said second electromagnetic contactor, and for electrically disconnecting said second electromagnetic contactor when said first shifting means is shifted in response to a closing of said first electromagnetic contactor.
Dependencies are inferred from the claim text.