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US 2005/0162171 A1Published application
Spark plug wire high-voltage sensor apparatus
AssigneeLisle Corporation
InventorMichael Whitehead
Life of this patent
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Abstract
A device for sensing a high voltage pulse in a spark plug wire in the form of a mechanical pen provides a neon bulb within a translucent or transparent tube having conductive members at the opposite ends of the tube connected with the neon bulb. A probe member at one end is formed or shaped to fit over a plug wire to enhance capacitive coupling so that current will be induced into the device upon the passage of a high voltage pulse through a plug wire.
Claims5
An apparatus for sensing a high voltage pulse in a spark plug wire of an internal combustion engine comprising, in combination;
- a handle of conductive material having an outer end and an inner contact end, said handle defining a longitudinal axis;
- a translucent bulb retention tube of nonconductive material affixed to the inner contact end of the handle, said tube comprising an axial extension from the handle;
- and having an opposite tube end;
- a bulb positioned in the tube said bulb including a first contact in electrical communication with the inner contact end of the handle and a second contact end extending in the opposite axial direction in the tube;
- and
- a conductive probe member attached to the opposite tube end, said conductive probe member electrically connected to the second contact end of said bulb to form a series circuit through the probe, the bulb and the handle, said probe further including a probe end spaced from the connection to the tube, said probe end configured to fit over a spark plug wire whereby manual placement of the probe over a wire having a high voltage pulse will by capacitive coupling to the probe generate a current flow through the bulb to ground.
3 more elements
Dependencies are inferred from the claim text.