Electromagnetic relay

Claim 2

An improved contact assembly for an electromagnetic relay having a base member, an electromagnet and a pivotable flat armature movable between an attracted position generally parallel to said base member and an unattracted position angular to said base member, which comprises: an elongated post, one end of said post being rigidly fixed to said armature, the other end of said post having a shoulder therearound, said post being fixed to said armature at substantially right angles to the plane defined by said armature; a first pair of electrical contacts disposed on opposite sides of said armature and fixed to, and substantially parallel, to, said base; a first electrically conductive, elongated, flat contact carrying arm having an electrical contact mounted at each end and adapted to bridge said first pair of electrical contacts, said post passing through an aperture in the central portion of said first contact arm so that said first contact carrying arm is slideable on said post; a second electrically conductive, elongated, flat contact carrying arm having an electrical contact mounted at each end, said post passing through an aperture in the central portion of said second contact carrying arm so that said second contact carrying arm is slideable on said post; a slightly upraised portion on said armature disposed adjacent said post and facing said first contact carrying arm; a compression spring mounted concentrically with said post between said first and second contact carrying arms, said compression spring urging one side of said first contact carrying arm against said slightly upraised portion on said armature to cause the contacts mounted on said first contact carrying arm to be substantially parallel to said first pair of fixed contacts when said armature moves to its second energized position, and said spring urging said second contact carrying arm against the shoulder on said post; a second pair of electrical contacts fixed to said base, said second pair of electrical contacts being adapted to be bridged by, and substantially parallel to, the contacts mounted on said second contact carrying arm when said armature moves to its first deenergized position; guide means secured to said armature for preventing rotation of said first and second contact carrying arms on said post; and an electrically insulating sleeve surrounding one of said contact carrying arms to electrically insulate said first and second contact carrying arms.

Claim 3

An electromagnetic relay, comprising: a base member; an electromagnetic coil having a plurality of conductive turns wound upon a coil bobbin, the axis of said coil extending parallel to said base member; means for mounting said coil bobbin on said base member; a first L-shaped magnetizable member, the first leg of said L-shaped member extending axially through said electromagnetic coil, the second leg of said L-shaped member extending toward said base member; a second L-shaped magnetizable member, the first leg of said second L-shaped member extending axially through said electromagnetic coil in overlying relationship with the first leg of said first L-shaped magnetizable member to form a C-shaped magnetizable member, the second leg of said second L-shaped member extending toward said base member; a flat elongate magnetizable armature pivotally connected to the second leg of said first L-shaped member, said armature having a first portion disposed for pivotal movement between said electromagnetic coIl and said base member, and a second portion extending away from said electromagnetic coil, said second portion having an upraised portion thereon, said armature moving from a first deenergized position to a second energized position upon energization of said electromagnetic coil; spring means for biasing said armature to said first position; an elongated post, one end of said post being rigidly fixed to said armature, the other end of said post having a shoulder therearound, said post being fixed to said armature at substantially right angles to the plane defined by said armature; a first pair of electrical contacts disposed on opposite sides of said armature and fixed to, and substantially parallel to, said base; a first electrically conductive, elongated, flat contact carrying arm having an electrical contact mounted at each end and adapted to bridge said first pair of electrical contacts, said post passing through an aperture in the central portion of said first contact carrying arm so that said first contact carrying arm is slideable on said post; a second electrically conductive, elongated, flat contact carrying arm having an electrical contact mounted at each end, said post passing through an aperture in the central portion of said contact carrying arm so that said second contact carrying arm is slideable on said post; a compression spring mounted concentrically with said post between said first and second contact carrying arms, said compression spring urging one side of said first contact carrying arm against said slightly upraised portion on said armature to cause the contacts mounted on said first contact carrying arm to be substantially parallel to said first pair of fixed contacts when said armature moves to its second energized position, and said spring urging said second contact carrying arm against the shoulder on said post; a second pair of electrical contacts fixed to said base, said second pair of electrical contacts being adapted to be bridged by, and substantially parallel to, the contacts mounted on said second contact carrying arm when said armature moves to its first deenergized postion; guide means secured to said armature for preventing rotation on said first and second contact carrying arms on said post; and an electrically insulating sleeve surrounding one of said contact carrying arms to electrically insulate said first and second contact carrying arms.

Claim 4

An electromagnetic relay, comprising: a base member; an electromagnetic coil having a plurality of conductive turns wound upon a coil bobbin, the axis of said coil extending parallel to said base member; means for mounting said coil bobbin on said base member; a first L-shaped magnetizable member, the first leg of said L-shaped member extending axially through said electromagnetic coil, the second leg of said L-shaped member extending toward said base member; a second L-shaped magnetizable member, the first leg of said second L-shaped member extending axially through said electromagnetic coil in overlying relationship with the first leg of said first L-shaped magnetizable member to form a C-shaped magnetizable member, the second leg of said second L-shaped member extending toward said base member; a flat elongate magnetizable armature pivotally connected to the second leg of said first L-shaped member, said armature having a first portion disposed for pivotal movement between said electromagnetic coIl and said base member, and a second portion extending away from said electromagnetic coil, said second portion having an upraised portion thereon, said armature moving from a first deenergized position to a second energized position upon energization of said electromagnetic coil; spring means for biasing said armature to said first position; an elongated post, one end of said post being rigidly fixed to said armature, the other end of said post having a shoulder therearound, said post being fixed to said armature at substantially right angles to the plane defined by said armature; a first pair of electrical contacts disposed on opposite sides of said armature and fixed to, and substantially parallel to, said base; a first electrically conductive, elongated, flat contact carrying arm having an electrical contact mounted at each end and adapted to bridge said first pair of electrical contacts, said post passing through an aperture in the central portion of said first contact carrying arm so that said first contact carrying arm is slideable on said post; a second electrically conductive, elongated, flat contact carrying arm having an electrical contact mounted at each end, said post passing through an aperture in the central portion of said contact carrying arm so that said second contact carrying arm is slideable on said post; a compression spring mounted concentrically with said post between said first and second contact carrying arms, said compression spring urging one side of said first contact carrying arm against said slightly upraised portion on said armature to cause the contacts mounted on said first contact carrying arm to be substantially parallel to said first pair of fixed contacts when said armature moves to its second energized position, and said spring urging said second contact carrying arm against the shoulder on said post; a second pair of electrical contacts fixed to said base, said second pair of electrical contacts being adapted to be bridged by, and substantially parallel to, the contacts mounted on said second contact carrying arm when said armature moves to its first deenergized postion; guide means secured to said armature for preventing rotation on said first and second contact carrying arms on said post; and an electrically insulating sleeve surrounding one of said contact carrying arms to electrically insulate said first and second contact carrying arms.