US1095273A - Testing device for gas-engines. - Google Patents

Description

' W. 0. FORGE. TESTING DEVICE FOR GAS ENGINES.

APPLICATION FILED APR. 28, 1913.

V Patented May 5, 1914.

6 W 1 W 1 M Z Y 2 w Z1", m n a W n V v M, 5 5 1 $51 atto'mau I WILLIAM CUTTER FORCE, OF NORTH PLAINFIELD, NEW JERSEY.

TESTING DEVICE FOR GAS-ENGINES.

Specification of Letters Patent.

Patented May 5, 1914.

Application filed April 28, 1913. Serial No. 763,993.

To all whom it may concern:

Be it known that I, WILLIAM C. Fonon, a citizen of the United States, anda resident of North Plainfield, in the county of Somerset and State of New Jersey, have invented certain new and useful Improvements in Testing Devices for Gas-Engines, of which the following is a specification.

The present invention relates generally to a testing device for an internal combustion motor, and has for its object the production of a device for coi'iveniently and quickly testing the ignition system of the motor, and locating misfiring in cylinders.

The invention consists of the features expressed in the claims, av preferred embodiment of which is shown in the accompanying drawings and description.

In the said'drawings: Figure 1 is a diagrammatic view showing the testing device applied to an internal combustion motor. Fig. 2 is an enlarged detail view of the testing device, with parts broken away and in section to more clearly illustrate the interior construction of the device. Fig. 3 is a detail sectional view on the line 33 of Fig-2, with some of the parts shown in elevation.

Like reference characters indicate correspending parts throughout the several views. o indicates a currentconducting member adapted to be grounded on the motor. As

here shown it consists of a hollow weight electrically and mechanically connected to a flexible current conducting member 6, the free end of which is adapted to be placed in circuit with the spark plug of an internal combustion motor. In the preferred form I provide a plurality of flexible current conducting members (5, which may conveniently be made in one piece and bent into a loop as at 7, and a portion of the insulation removed and the loop inserted in the hollow. portion of the weighted member .3. A body of current conducting material 8, such as lead or Babbitt metal, surrounds the looped end of the flexible current comlucting member and forms an electrical coimcctiou between the latter andthe weight. A body of fiber 9 may als be inserted in the opening in the said weight. to prevent the insulation sur rounding the flexible current conducting members from being cut or injured. Preferably the said flexible current conducting members (3 are mcclmnically and electrically connected, as slrown, to the contacts 10, in this case by passing up through an opening 11 in the side of the said contact member and having the insulation removed so that the naked wire 12 will extend into the tipsl3 of the said contact members. The contact members are formed with a hollow space 14 adjacent to the said tips, into which the insulated part of the current conducting members may extend, and insulated handles 15 are preferably utilized for carrying the contact members.

In Fig. l the method of using the device is shown and for this purpose there are disclosed the electrical circuits generally utilized in connection with the sparking device of the ignition system of an internal combustion motor. Ordinarily the path of the secondary or ignition current is from the contacts 16 of the distributer, through secondary wires '17, each going to one of the spark plugs '18, 19, 20 and 21. Thence the circuit is across the spark plug gap in a wellknown manner, through cylinders and ground wire, indicated in dotted lines22, to

the rotor 3 of the magneto.

In using the testing device of the present invention the weighted member 5 is placed on the motor frame, as shown, and thus a ground connection is made from the same to the rotor of the magneto. Then by placing the contact member 10 on one of the spark plugs the current will be shunted from the secondary wire 17 to the said contact member 10, thence through tie flexible current conducting member 6 ant to the weighted current conducting member 5. Thus the current is prevented from passing through the spark plug inside the cylinder.

In the diagram shown in Fig. 1 both of the contactslO are utilized, one being placed on thespark plug of the first cylinder and the other on the spark plug of the third cylinder.- Assuming the motor to be running, then if the second and the fourth cylinders .are firing' regularly, it is obvious that the misfiring, due to faulty compression or other causes, is in either the first or thethird cylinder. By changing the contact member 10 of the testing device from thle third cylinder to the fourth cylinder, it will be ascertained whether or not it is the first 'or the third cylindcr which is misfiring, because if the second and the third cylinders fire regularly, it is clear tha tsit 'must be the first cylinder which is misliri ng'. This is one method out of several whereby this device can'be utilized, since of course the cylinders may be tested in any combination desired.

in addition, by placing the weighted mom-- her on the frame of the motor and by holding one of the terminals about oneeighth of an inch from the top of the spark plug, a spark can be produced between the top of the spark plug and the contact member 10. In this way it can be determined may be employed.

whether or not current is passing properly from the distributer of the magneto. If the spark device is of the make and break type, the contact member 10 can be placed in contact with one of the spark plugs and then moved slowly out of contact therewith, whereby a spark will likewise be produced.

At the end of one of the contacts 15 I ma y pivot two gages, one, 24-, for gaging the proper distance between the two points of the spark plug inside the cylinder, when using the magneto, and the other, 25, for gaging the proper distance between the same points when using the battery. The end of.

the other handle 15 may be provided with a fork 26 by means of which the spark plug points can be readily bent or adjusted. If desired, more than two contact members 10 hat is claimed, is:

l. A testing device for internal combustion motors comprising, a current conduct-- ing member adapted to be grounded on the motor, a plurality of handles each having a contact member adapted to be placed in circuit with a spark plug, and flexible current conducting members connected to the firstmentioned current conducting member and to the respective handles.

2. A testing device for internal combustion motors comprising, a plurality of handles each having a contact member adapted to be placed in circuit with the spark plug, a flexible currentconducting member connected to each contact member, and a common current conducting member connected to the flexible current conducting members and adapted to be grounded on the motor.

8. A testing device for internal combustion motors comprising, a current conduct ing member adapted to be grounded on the motor, and a flexible current conducting member formed into a loop and. having its said loop electrically and mechanically connccted to the current conducting 'membcr,

the free ends of said flexible current conducting member being adapted to be placed in circuit with the spark plu i. A testing device for internal combus tion motors comprising, a current conductiug member adapted to begrounded on the motor, a flexible current conducting member formed into a loop and having its said loop electrically and mechanically connected to the current conducting member, and handles having contact'members adapted to be placed in circuit with the spark plugs electrically and mechanically connected to the free ends of the flexible current conducting member.

5. A testing device for internal combustion motorscomprising, a weighted current conducting member adapted to be grounded on the motor, a plurality of handles each having a contact member adapted to be placed in circuit with the spark plug, and flexible current conducting members connected to the weighted current conducting member and to the respective handles.

6. A testing device for internal combustion motors comprising, two handles each having a contact member adapted to be placed in circuit with the spark plug, a flexible current conducting member connected to each contact member, and a weighted common current conducting member connected to the flexible current conducting members and adapted to be grounded on the motor.

7. A testing device for internal combustion motors comprising, a weighted current conducting mcmbe adapted to be groumlcd on the motor, and a flexible current condu t-- ing member formed into aloop and having, its said loop electrically and mechanically connected to the weighted current conducting member, the free ends of said flexible current conducting member being adapted to be placed,in circuit with the spark plug.

8. A testing device for internal combustion motors comprising, a weighted current conducting member adapted to be grounded on the motor, a flexible current conductiin, member formed into a loop and having its said loop electrically and mechanically connected to the weighted current conducting member, and handles having contact members adapted. to be placed in circuit with the spark plugs electrically and mechanically connected to the free ends of the flexible current conducting member.

9. A testing device for internal combuslion motors comprising, a flexible current conducting member adapted to be grounded on the motor, a contact member having an opening in its side through which said flexible current conducting member may extend, and means for electrically and mechanically connecting the flexible current conducting member and the contact member.

Signed at Plainfield in the county of Union and State of New Jersey this 21 day of April. A. D. 1913.

WILLIAM CUTTER FORCE.

Witnesses:

F. J. Bm'rz, 'lmucsa V. L nch;

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