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US 4,951,018 AGranted
Electromagnetic contactor
AssigneeSquare D Company
InventorsJon Hanson, Larry W. Schiffer, Daniel P. Heckenkamp, Thomas F. Kurland
Life of this patent
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AssigneeSquare D Company
InventorsJon Hanson, Larry W. Schiffer, Daniel P. Heckenkamp, Thomas F. Kurland
Estimating the term…
An electromagnetic contactor includes a housing assembly that may be adapted for one, two, three or four poles. An armature is affixed to a contact carrier either by a flat leaf spring that passes through a slot in a laminated armature or by a press fit of a solid armature into the contact carrier. In one embodiment of the invention, a housing assembly snaps into a base to permit a maximum amount of automatic asssembly and a minimum number of components. These components include a base, a magnet assembly having at least one shading coil, a formed coil assembly, two symmetrically disposed springs to return a contact carrier to a neutral position when the coil is de-energized, an armature to complete the magnetic circuit that is attached to the contact carrier, a contact block that supports terminals and stationary contacts, and a contact carrier that carries one or more moving contacts into engagement with the fixed contacts. A coil spring for each contact applies a force when the electromagnet is energized to draw the removable contacts to the fixed contacts to close an electric circuit. A magnet clip secures the magnet assembly by latching in place without screws or rivets. In an alternate embodiment, a molded cantilever supports a coil assembly under spring tension.
In an electromagnetic contactor having a housing, a fixed contact connected to the housing, a moving contact, a contact carrier that holds the moving contact and moves the contact carrier with respect to the housing to make and break an electrical connection between the fixed contact and the moving contact, a movable armature connected to the contact carrier, and a coil assembly disposed to produce a magnetic field in the armature when an electric current is passed through the coil assembly, the improvement comprising:
In an electromagnetic contactor having a housing, a fixed contact connected to the housing, a moving contact, a contact carrier that holds the moving contact and moves the contact carrier with respect to the housing to make and break an electrical connection between the fixed contact and the moving contact an armature connected to the contact carrier, a coil assembly disposed to produce a magnetic field in the armature when an electric current is passed through the coil assembly, the improvement comprising:
In an electromagnetic contactor having a housing, a fixed contact connected to the housing, a moving contact, a contact carrier that holds the moving contact and moves the contact carrier with respect to the housing to make and break an electrical connection between the fixed contact and the moving contact, a movable armature connected to the contact carrier, and a coil assembly disposed to produce a magnetic field in the armature when an electric current is passed through the coil assembly, the improvement comprising:
Dependencies are inferred from the claim text.