Buzzer including coil with wound connections

Claim 2

A buzzer comprising: a housing; a ferrous core mounted by the housing and including armature and coil supporting portions, the coil supporting portion having a relatively sharp edge portion; a ferrous armature and electrically conductive resilient means supporting the armature on the armature supporting portion of the ferrous core in laterally spaced relationship to an adjacent portion of the core, the resilient means deflecting to allow the armature to move into alignment with the adjacent portion of the core; a first contact mounted by the housing and engaging the resilient means when the armature is in its unaligned relationship with the core so as to transmit an electric current to the core, the resilient means moving out of engagement with the first contact when the armature moves into alignment with the core to thus break the path of current flow; a coil including a spool member with insulated wire wound thereon in a layered manner, the spool member being mounted on the coil supporting portion of the core prior to the winding of the wire so as to leave the sharp edge portion thereof exposed such that this edge portion scrapes the insulation from the inner end of the wire to electrically connect the wire to the core; and a second contact mounted relative to the housing and being electrically connected to the outer end of the wire so as to allow the buzzer to be activated by supplying a voltage across the first and second contacts to energize the coil and provide a flux field that moves the armature into alignment with the core, the path of current through the buzzer being cyclically interrupted by movement of the armature to its aligned relationship with the core to cyclically de-energize the coil and allow the resilient means to return the armature to its unaligned relationship so that thIs cyclic movement provides an audio signal.

Claim 3

A buzzer comprising: a housing; a ferrous core mounted by the housing and including armature and coil supporting portions, the coil supporting portion having a plurality of relatively sharp edge portions; an armature and electrically conductive resilient means supporting the armature on the armature supporting portion of the ferrous core in laterally spaced relationship to an adjacent portion of the core, the resilient means deflecting to allow the armature to move into alignment with the adjacent portion of the core; a first contact mounted by the housing and engaging the resilient means when the armature is in its unaligned relationship with the core so as to transmit an electric current to the core, the resilient means moving out of engagement with the first contact when the armature moves into alignment with the core to thus break the path of current flow; a coil including a spool member with primary and secondary winding portions, the spool member being mounted on the coil supporting portion of the core so as to leave the sharp edge portions thereof exposed to wire wound on the primary portion of the spool member and insulated wire wound on the primary portion of the spool member in a layered manner so that the edge portions of the core scrape the insulation from the wire at the inner end thereof to provide an electrical connection to the core; and a second contact mounted on the spool member of the coil and including a relatively sharp edge portion for engaging and scraping insulation from the other end of the wire as it is wound on the secondary winding portion of the spool member to thus allow the buzzer to be activated by supplying a voltage across the first and second contacts so as to energize the coil and provide a flux field that moves the armature into alignment with the core, the path of current through the buzzer being cyclically interrupted by movement of the armature to its aligned relationship with the core to cyclically de-energize the coil and allow the resilient means to return the armature to its unaligned relationship so that this cyclic movement provides an audio signal.

Claim 4

A buzzer comprising: a housing; a ferrous core mounted by the housing and including armature and coil supporting portions, the coil supporting portion having a plurality of relatively sharp edge portions; an armature and electrically conductive resilient means supporting the armature on the armature supporting portion of the ferrous core in laterally spaced relationship to an adjacent portion of the core, the resilient means deflecting to allow the armature to move into alignment with the adjacent portion of the core; a first contact mounted by the housing and engaging the resilient means when the armature is in its unaligned relationship with the core so as to transmit an electric current to the core, the resilient means moving out of engagement with the first contact when the armature moves into alignment with the core to thus break the path of current flow; a coil including a spool member with primary and secondary winding portions, the spool member being mounted on the coil supporting portion of the core so as to leave the sharp edge portions thereof exposed to wire wound on the primary portion of the spool member and insulated wire wound on the primary portion of the spool member in a layered manner so that the edge portions of the core scrape the insulation from the wire at the inner end thereof to provide an electrical connection to the core; and a second contact mounted on the spool member of the coil and including a relatively sharp edge portion for engaging and scraping insulation from the other end of the wire as it is wound on the secondary winding portion of the spool member to thus allow the buzzer to be activated by supplying a voltage across the first and second contacts so as to energize the coil and provide a flux field that moves the armature into alignment with the core, the path of current through the buzzer being cyclically interrupted by movement of the armature to its aligned relationship with the core to cyclically de-energize the coil and allow the resilient means to return the armature to its unaligned relationship so that this cyclic movement provides an audio signal.

Claim 5

A buzzer comprising: a housing; a ferrous core of a generally U-shaped configuration and having a number of relatively sharp edges on the base of the core; a ferrous armature and electrically conductive resilient means secured to one leg of the core and supporting the armature adjacent the other leg of the core in laterally spaced relationship relative thereto, the resilient means deflecting to allow the armature to move into lateral alignment with the other leg of the core; a first contact mounted by the housing and engaging the resilient means when the armature is in its unaligned relationship with the core so as to transmit an electric current to the core, the resilient means moving out of engagement with the first contact when the armature moves into alignment with the core to thus break the path of current flow; a coil including a spool member of a generally saddle-shaped configuration and having primary and secondary winding portions, the spool member being mounted on the base of the core so as to leave the sharp edges of the base exposed to wire wound on the primary portion of the spool member, and insulated wire wound on the primary portion of the spool member in a layered manner so that the edges of the base scrape the insulation from the wire at the inner end thereof to provide an electrical connection to the core; and a second contact mounted on the spool member of the coil and including a flange with a relatively sharp edge for engaging and scraping insulation from the other end of the wire as it is wound on the secondary portion of the spool member to thus allow the buzzer to be activated by supplying a voltage across the first and second contacts so as to energize the coil and provide a flux field that moves the armature into alignment with the cOre, the path of current through the buzzer being cyclically interrupted by movement of the armature to its aligned relationship with the core to cyclically de-energize the coil and allow the resilient means to return the armature to its unaligned relationship so that this cyclic movement provides an audio signal.

Claim 6

A buzzer comprising: a housing; a ferrous core of a generally U-shaped configuration and having a number of relatively sharp edges on the base of the core; a ferrous armature and electrically conductive resilient means secured to one leg of the core and supporting the armature adjacent the other leg of the core in laterally spaced relationship relative thereto, the resilient means deflecting to allow the armature to move into lateral alignment with the other leg of the core; a first contact mounted by the housing and engaging the resilient means when the armature is in its unaligned relationship with the core so as to transmit an electric current to the core, the resilient means moving out of engagement with the first contact when the armature moves into alignment with the core to thus break the path of current flow; a coil including a spool member of a generally saddle-shaped configuration and having primary and secondary winding portions, the spool member being mounted on the base of the core so as to leave the sharp edges of the base exposed to wire wound on the primary portion of the spool member, and insulated wire wound on the primary portion of the spool member in a layered manner so that the edges of the base scrape the insulation from the wire at the inner end thereof to provide an electrical connection to the core; and a second contact mounted on the spool member of the coil and including a flange with a relatively sharp edge for engaging and scraping insulation from the other end of the wire as it is wound on the secondary portion of the spool member to thus allow the buzzer to be activated by supplying a voltage across the first and second contacts so as to energize the coil and provide a flux field that moves the armature into alignment with the cOre, the path of current through the buzzer being cyclically interrupted by movement of the armature to its aligned relationship with the core to cyclically de-energize the coil and allow the resilient means to return the armature to its unaligned relationship so that this cyclic movement provides an audio signal.

Claim 7

A buzzer according to claim 3 wherein the coil core is manufactured from relatively thin ferrous stock and the normal laterally spaced relationship between the armature and the adjacent leg of the core is a result of an offset portion of this core leg.

Claim 8

A buzzer according to claim 3 wherein the primary and secondary winding portions are defined by saddle-shaped flanges of the spool member.