Multiple function testing device for simultaneous testing of functions of an engine

Claim 1

An apparatus for testing an internal combustion engine by measuring distributor timing, cam dwell revolutions per minute and voltage functions, said apparatus including in combination: a single meter circuit including an input terminal and an output terminal adapted to be connected to a first terminal of the engine battery; a cam dwell measuring means and a tachometer means, both said means having a common input terminal for connection to a distributor of an engine and an output terminal for connection to said meter circuit input terminal; said cam dwell measuring means and said tachometer means being connected within said apparatus to operate supstantially independently of each other; an engine timing light means having a first terminal for connection to a second terminal of said battery, a second terminal for connection to a spark plug, and a third terminal for connection to said meter circuit output terminal; and a voltmeter means including a variable resistor having a resistance range selected to provide full scale meter deflection for the condition of a battery being charged to its maximum potential coupled between said timing light means first terminal and said meter circuit input terminal, one of said cam dwell measuring means, said tachometer means and said voltmeter means being selectively operable simultaneous with operation of said timing light means for simultaneous measurement of engine timing and one of cam dwell, revolutions per minute and voltage.

Claim 2

An apparatus for testing an internal combustion engine by measuring distributor timing, cam dwell revolutions per minute and voltage functions, said apparatus including in combination: a single meter circuit including an input terminal and an output terminal adapted to be connected to a first terminal of the engine battery; a cam dwell measuring means and a tachometer means, both said means having a common input terminal for connection to a distributor of an engine and an output terminal for connection to said meter circuit input terminal; said cam dwell measuring means and said tachometer means being connected within said apparatus to operate supstantially independently of each other; an engine timing light means having a first terminal for connection to a second terminal of said battery, a second terminal for connection to a spark plug, and a third terminal for connection to said meter circuit output terminal; and a voltmeter means including a variable resistor having a resistance range selected to provide full scale meter deflection for the condition of a battery being charged to its maximum potential coupled between said timing light means first terminal and said meter circuit input terminal, one of said cam dwell measuring means, said tachometer means and said voltmeter means being selectively operable simultaneous with operation of said timing light means for simultaneous measurement of engine timing and one of cam dwell, revolutions per minute and voltage.

Claim 16

An apparatus for testing an internal combustion engine by measuring distributor timing, cam dwell, revolutions per minute, and voltage functions, comprising: a gang switch incorporating first and second slidable bars in combination with first and second sets of four contacts, said bars adapted to interconnect adjacent contacts sequentially; means to electrically interconnect said second and fourth contacts of said first set of contacts to said third contact of said second set of contacts; means to connect said third contact of said first set of contacts to the distributor of said internal combustion engine; an ammeter including negative and positive inputs; a first variable resistance connected in parallel with said ammeter; a capacitor connected in parallel with said ammeter; a first diode including a cathode electrically connected to said ammeter positive input; a second diode including a cathode connected to the anode of said first diode, and an anode connected to said negative meter input; a zener diode interconnected between said common electrical connection of said first and second diodes and said second and fourth contacts of said first gang of contacts; a first electrical junction adapted to be connected to a first terminal of the battery of said internal combustion engine; a resistor interconnected between said first electrical junction and the electrical interconnection between said zener diode and said first and second diodes; a series LC circuit interconnected between said fourth contact of said second group of contacts and said meter positive input; a second variable resistance interconnected between said second contact of said second group of contacts and said meter positive input; a second electrical junction adapted to be electrically connected to a second terminal of said internal combustion engine battery; a third variable resistance interconnected between said first contact of said second group of contacts and said second electrical junction; a transformer including a primary and secondary winding; a single pull single throw switch interconnected between said primary winding and said second electrical junction; a transistor interconnecting said primary winding to said first electrical junction via its emitter and collector; said transistor including a base electrically connected to said transformer secondary; a timing light including a gas discharge tube electrically connected across said transformer secondary to said first electrical junction and a capacitively coupled electrode for triggering a discharge in said tube; and means to couple said electrode to a spark plug of said internal combustion engine.

Claim 17

An apparatus for testing an internal combustion engine by measuring distributor timing, cam dwell, revolutions per minute, and voltage functions, comprising: a gang switch incorporating first and second slidable bars in combination with first and second sets of four contacts, said bars adapted to interconnect adjacent contacts sequentially; means to electrically interconnect said second and fourth contacts of said first set of contacts to said third contact of said second set of contacts; means to connect said third contact of said first set of contacts to the distributor of said internal combustion engine; an ammeter including negative and positive inputs; a first variable resistance connected in parallel with said ammeter; a capacitor connected in parallel with said ammeter; a first diode including a cathode electrically connected to said ammeter positive input; a second diode including a cathode connected to the anode of said first diode, and an anode connected to said negative meter input; a zener diode interconnected between said common electrical connection of said first and second diodes and said second and fourth contacts of said first gang of contacts; a first electrical junction adapted to be connected to a first terminal of the battery of said internal combustion engine; a resistor interconnected between said first electrical junction and the electrical interconnection between said zener diode and said first and second diodes; a series LC circuit interconnected between said fourth contact of said second group of contacts and said meter positive input; a second variable resistance interconnected between said second contact of said second group of contacts and said meter positive input; a second electrical junction adapted to be electrically connected to a second terminal of said internal combustion engine battery; a third variable resistance interconnected between said first contact of said second group of contacts and said second electrical junction; a transformer including a primary and secondary winding; a single pull single throw switch interconnected between said primary winding and said second electrical junction; a transistor interconnecting said primary winding to said first electrical junction via its emitter and collector; said transistor including a base electrically connected to said transformer secondary; a timing light including a gas discharge tube electrically connected across said transformer secondary to said first electrical junction and a capacitively coupled electrode for triggering a discharge in said tube; and means to couple said electrode to a spark plug of said internal combustion engine.