Geometrical instruments
Patent
1974-08-19
1976-02-03
McGlynn, Joseph H.
Geometrical instruments
136181, 320 25, 339113R, 339255P, 340249, H01R 1122
Patent
active
039361217
ABSTRACT:
Jumper cables or battery charging cables for automotive use and the like are disclosed in which at least one of the cable's gripper jaws or clamps is provided with a length of coiled heater-resistance wire. The length of wire is clamped to the portion of the jaw handle opposite that to which the jumper cable wire itself is connected, and extends a short distance outwardly of the handle. The coiled heater-resistance wire is chosen as to have a preferred resistance in the order of 0.5 to 2 ohms and has an exposed free end which may be contacted to the battery terminal prior to connecting the gripper jaws to the terminal to indicate whether the charger cables have been correctly or incorrectly connected. If the connection is incorrect, the resistance wire will sparkle visibly and safely at the point of contact with the terminal, thus indicating the the connection is wrong. If no visible sparkle is seen then the charger cables may be clamped with the knowledge that the connection is correct and safe.
REFERENCES:
patent: 3259754 (1966-07-01), Matheson
patent: 3267452 (1966-08-01), Wolf
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