US2413126A - Timing checking device - Google Patents

Description

Dec; 1946. F. D. WARBURTON 2,413,126

TIMING CHECKING DEVICE Filed Aug. 29, 1944 v rkg l I 4 v .INVENTOR.

3L7: cu k l7 11/ 11b Mr #011 Q 7 BY Patented Dec. 24, 1946 UNITED STATES PATENT OFFICE TIMING CHECKING Frank D. Warburton, Southgate, Calif; Application August 29, 1944, Serial No. 551,754

1 Claim.

This invention has to do with devices for checking the ignition timing in relation to the dead center position of internal combustion engines and in some respects is in the nature of an improvement upon the invention disclosed in my copending application Serial No. 527,163, filed March 20, 1944.

In my said copending application I disclose a device which has, in conjunction with visual means for indicating the sparking point in the ignition system of an internal combustion engine, audible means for indicating the direction of travel of the piston, as well as for indicating when the piston in its movement reaches dead center. My present invention accomplishes those purposes but by means of a simplified, more economical and more universally useful device, it being an object of the present invention to provide, in such a device, a resilient compressive means for mounting the device in the spark plug port of a cylinder to permit a single device to be readily installed in a port of any size.

It is a further object to provide in such a combination a simplified means for providing the audible signals as well as a simplified means for incorporating the audible signalling elements in the structure.

Additional objects of the invention are to provide an extremely simple device which requires but a minimum of parts, which is economical of manufacture and extremely durable.

By way of explaining my present improvements I shall now describe one of its presently preferred embodiments for which purpose I shall refer to the accompanying drawing, in which:

Fig. 1 is a side elevation of my device mounted in the spark plug port of an internal combustion engine, the latter being shown fragmentarily in section;

Fig. 2 is a longitudinal section of my device; and

Fig. 3 is a section on line 3-3 of Fig. 2.

Referring now to the drawing, the numeral 5 denotes a cylinder head of an internal combustion engine, having the usual cooling fluid jacket 5, a crank l, a piston 8, a connecting rod 9 and a spark plug port Hi. The piston is shown in the dead center position.

Generally denoted by the numeral l5, my timing checking device comprises a resilient compressible base portion 20 which is preferably made of soft rubber of a synthetic type which is relatively unaffected by oils and greases. The base is frusto conical in shape, having a longitudinal passageway 2| whose lower end communicates 2 with the combustion chamber, the base being adapted to be forced into spark plug port In in a manner to have fluid-tight fit therein.

The top end of the passageway 2| has an enlarged diameter portion 22 to receive the bottom reduced end of a cylindrical casing which may be made in two sections 25a, 26b, frictionally fitting together at 26.

In the upper end of the casing an electric light bulb socket 38 is secured, carrying a bulb 3!. The socket has connected to it two electrically conductive wires 34, 35, one of'which has on its free end a contact element not shown, adapted to be grounded to some metal part of the motor, and the other of which has a contact element, likewise not shown, which may be connected to the wire leading from the conventional distributor to the spark plug which would normally fit into the port I0 occupied by the checking device. Illumination of the bulb is visible through a window 36 in the casing.

Within an annular inwardly opening groove 38 formed in the side wall of the base I mount a round disc 39 whose peripheral edge is retained in the groove 38. Two elongated openings 40, 4|, are provided through the disc. In normal closing relationship to the opening 40 I secure on the top of the disc a vibratory tone-producing reed 65, one end of the reed being secured to the disc by means of a rivet 46. In normal closing relationship to opening 4| I secure on the bottom face of the disc a second vibratory tone-producing reed 59, one end of which is secured to the disc by rivet 5|. Reeds 45, 58 have relatively different tone-producing qualities so that a tone produced by one may be audibly distinguished from a tone produced by the other.

The disc 39 may be installed in the base by suitably flexing the base and is held securely in position by the resiliency of the material of the base.

In operation, upward movement of the piston in the cylinder will, by the resultant compression, force air outwardly through the passageway 2| of thebase, and the air passing outwardly through the opening to past the yieldable reed will vibrate the latter to produce an audible signal. When the piston reaches dead center in its upward movement, the audible signal will be momentarily silent until the piston begins its down stroke. The resultant vacuum in the combustion chamber created by the downward stroke of the piston will draw air into the combustion chamber through opening 4! to vibrate reed 50. Inasmuch as, if properly timed, the distributor 3 will close the circuit to the lamp 3| during the time the audible signal is silent, if the lamp 3| should be illuminated at any other time the operator will know that the motor is not properly timed and he will readily discover whether the sparking point is too early or too late in relation to the dead center position of the piston.

While, in the foregoing, I have resorted to considerable detail of structure and association of parts in describing a particular example of my invention, I wish it to be understood that I have done so merely to make my invention understood and that I do not limit my invention to such details. On the contrary, my invention is only to be limited as appears in the appended claim.

I claim:

In a timing checking device adapted to be temporarily secured in the spark plug port of an internal combustion engine, a hollow body, an

electric bulb mounted in the body, electrically conductive means associated with the bulb and extending through the body for connection into the ignition circuit of the engine, a neck member secured axially to the lower end of the body and having a peripheral surface engageable in said spark plug port, said neck member having an axial bore for providing air communication between the engine and the interior of the body, an air-actuated signalling element mounted transversely of the bore, and common means for providing ingress and egress of air into and from the body and rendering visible from the exterior of the body illumination created by the bulb, said means comprising a window in the body adjacent the bulb and above the air responsive signalling element.

FRANK D. WARBURTON.

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