US1322157A - Device for testing- electric currents - Google Patents

Description

C. F. ARNOLD. DEVECE FOR TESTING ELECTRIC CURRENTS/ APPLICATION FILED MAR. 21,1918.

Patented Nov. 18, 1919.

ATTOR N EY WITNESSES it 4 mm UNITED STATES PATENT OFFICE.

CARL F. ARNOLD, OF WATSONVILLE, CALIFORNIA.

DEVICE FOR TESTING ELECTRIC CURRENTS.

Application filed March 27, 1918.

To all whom it may concern:

Be it known that I, CARL F. ARNOLD, a citizen of the United States, residing at WVatsonville, in the county of Santa Cruz and State of California, have invented cer tain new and useful Improvements in De vices for Testing Electric Currents, of which the following is a specification.

This invention relates to a new and useful device for testing electric currents and the principal object of the invention 1s to provide a device of this nature which can be used to test the electric system of an automobile and other internal combustion engines.

Another object of the inventlon is to provide a device of this character whereby a' defective spark plug or coil unit can be located in an instant.

Another object of the invention is to provide a device which can be easily and readily applied to the part to be tested.

Another object of the invention is to pro vide means whereby the device can be held in the hand while the part is being tested or can be temporarily attached to said part.

Another object of the invention is to provide adjustable means on the device whereby the strength of the current can be determined.

Another object of the invention is to provide a device of this character which is simple and durable in construction, reliable and eflicient in operation and one which can be manufactured and placed upon the market at a minimum cost.

The invention also consists in certain other features of construction and in the combination and arrangement of the several parts, to be hereinafter fully described and specifically pointed out in the appended claims.

In describing my inventlon in detail, reference will be had to the accompanying drawings, wherein like characters denote like or corresponding parts throughout the several views, and in which:

Figure 1 is a top view of the inventlon.

Fig. 2 is an end view thereof. I

In these figures, 1 indicates the handle of the device made of any suitable insulating material and I prefer to form this handle of T shape. Two screws 2 are earned by the head 1 of the handle, one on each end there- Specification of Letters Patent.

Patented Nov. 18, 1919.

Serial No. 225,010.

of and these screws carry the testing members 3 and 4, said members being of any suitable conducting material and are held on the screws by means of the knurled nuts 5 and the posts 6 having the knurled enlarged central portions 6. Each member has its outer end forked, as at 7 and extended beyond the opposite sides of the handle to engage with the spark plug and the member 3 has its inner end turned up, as at 8, and the other member 4 is of considerably greater length than the member 3 and is bent upwardly and inwardly so that the end lies directly over the bent-up end 8 of the member 3. The extreme end is then bent over to form a loop 4 and both portions of the loop are formed with a screw threaded hole therein to receive a screw 9, the point of said screw being directly over the turned-up end 8 so that when a spark plug is to be tested the current is caused to jump the gap between the screw and the turned-up end 8 to complete the cir cuit. The loop A prevents movement of the screw, due to vibrations or the like, as it has the effect of a spring and thus holds the screw firmly against movement. By adjusting the screw in relation to the turned-up end 8 the strength of the current is determined.

It is thought from the foregoing that the advantages and novel features of my invention will be readily apparent.

I desire it to be understood that I may make slight changes in the construction and in the combination and arrangement of the several parts, provided that such changes fall within the scope of the appended claims.

I claim as my invention:

1. A device for testing electric currents comprising a handle part of insulating material, a pair of conducting members on said handle having their adjacent ends spaced apart, one member having a spring loop formed thereon and a screw member passing through said spring loop.

2. A device for testing electric currents comprising a handle part of insulating material, a pair of conducting members secured to one face thereof and having their outer ends extending beyond the opposite sides of the handle, the inner terminal of one of said members being bent upwardly of the face of the handle to which it is secured, the inner terminal end of the other member being bent In testimony whereof I affix my signature inwafdly to be arrangei above the tegminal in presence of two Witnesses.

of t 1e co-acting con uct'm mem er in T spaced relation to form a sgark gap, and CARL ARA means on one conducting member to regulate \Vitnesses:

the space between the terminals of the con- A. S. CHRISTENSEN,

ducting members. C. R. TAYLOR.

Images