US1916694A - Ignition coil and controlling device therefor - Google Patents

Description

July 4, 1933. w, E. scHwARzMANN IGNITION COIL AND CONTROLLING DEVICE THEREFOR Filed May 6. 1952 INVENTOR h/O/fy ScWa/z/mswo ATTORNEY Patented July 4, 1933 j UNITED STATES 1 A'1.E1-Vry OFFICE WOLFGANG E. SCHWARZPILANN., OF'LONGMEADOW', *MASSACHUSETTS ASSIGNOR TO UNITED AMERICAN BOSCH' CORPORATION, OF SPRINGFIELD, 'MASSACHUSETTS A j CORPORATION OF NEW YORK IGNITION COIL AND CNTROLLING DEVICE TI'ERIEFOIR.l.`

Application led May 6, 1932. Serial No. 60.95666.

rlhis invention relates to improvements in ignition coils vfor internal combustion engines; and especially to the generating coil of a magneto for ignition apparatus and the.

interposition of ardistributor ofthe usualy type.

The invention is particularly useful for two-cylinder two-cycle engines which require a spark at every half revolution; and'it enables the magneto to dispense with the usual carbon holder or distributor for selecting the cylinder in which the spark is to be produced. Y v

A further object of the invention is to provide a simple ignition coil which has high and low tension windings andwhich can be easily mounted and effectivelyoperated in connection with a magneto that can be'incorporated into the flywheel of an internal combustion engine, with magnets that are rotated by the flywheel and carried thereby into position to energize the coil. In practice the necessary circuit controlling devices for the coil are also actuated by the flywheel shaft.

The foregoing and other objects and ad- Vantages of this invention are set forth in the ensuing specification and the novel features pointed out in the appended claims; but, of course, the right is reserved to make such changes in the shape, size and arrangement of the parts as fall within the principle of the invention.

On the drawing:

Fig. 1 is a somewhat diagrammatic view showing an embodiment of the invention in front elevation; and

Fig. 2 is an end view seen from the rightV of Fig. 1.

The same numerals identify the samel or casing which will house the primary turns 2 and the secondary turns 3. One end of the primary windings will be grounded at 4 and the opposite end will be connected to a mov-Y able interrupter lever 5 carrying a contact 6 which engages a fixed contact 7 also connected to ground. This coil may be mounted upon a suitable support adjacent the flywheel or other moving part of an internal combustion engine and said part will carry the magnets; not shown, forY directing a magnetic flux through said coil periodically and withdrawing said flux, to energize this coil. Both the coil and the magnets may have polepieces of any suitable shape.- For a two-cylinder twocycle engine the coil will be energized twice v in each revolution, and the magnets on the moving part of the engine may be bar magnets and may have their polepieces carried into position at every half revolution to cooperate with the coil. Y Y

The terminals of the secondary or high tension winding 3 will be connected separately by leads 10 and 11 to the two spark plugs in said two-cylinder engine indicated at 12 and 13.` The conductors l1() and 11 are continuous and permanently vunited tothe terminals of the secondary, but the ignition current passes to only one spark plug at a time and produces a spark tliereat because of a suitable circuit controller mounted on the shaft 14; which may be the shaft carrying the rotating magnets. This shaft also carries a cam 15 for actuating the circuit breaker lever 5.

Each of the terminals of the high tension coil is also connected to one of the fixed terminals 16 and 17, arranged 180 degrees apart; and these terminalsare controlled by a member 18 on the shaft 14 having a cooperating projection 19. The member 18 is of conducting material and as it revolves'each end of the secondary will be grounded in turn.

In operation, when the shaft 14 revolves, the magnets, not shown, will be carried into cooperative relation with the coil to energize the latter at each period of ignition; and at the proper instant one projection of the double cam 14 will actuate the lever 5, to separate the contacts 6 and 7. A spring, not shown, may be connected to the lever so that the contacts 6 and 7 are normally held in engagement. At the same time the projection 19 on the member 18 will connect one end of' the secondary 3 to ground by way of the terminal 16. Hence the circuit will be through the conductor 11 to the spark plug 13 and by way of vground` tothe other terminal of the coil'. A half revolution later a spark will be produced at the plug 12 because the opposite terminal of the secondary will be connected to ground by way of the terminal 17.

It will be seen from this arrangement that boththe primary and secondary circuit are `so that less efficient insulation for the terminals 16a and 17, whichy are successively connected to. ground, can be utilized.

Having described the invention,y what is claimed is:

1, An ignition coil comprising a primary and a secondary winding, a. circuit breaker comprising a fixed and' movable contact and l a cam having one or more projections to con.- trol the circuit ot said primary winding, a

mfjixed terminal connected to each end of the secondary, a permanent connection ora sparkplug to beunited to each end of the secondary winding, and a substantially circular` member of conductive material rotating with said cam and having a projection on its circumference to ground the terminals'of the secondary by turns, said member and said terminals being so disposed thatsaid projection, as said member rotates, passes in proximity to each of said terminals in succession but without making contact therewith, in conjunction `with the action of saidA cam, whereby when the primary circuit is opened one of the ends of the seconda-ry will be connected to ground and a spark will be produced at the plug connected' to the other terlminal ofthe secondary.

2.v An ignition coil comprising a primary and a secondary winding, a circuit breaker for controlling the primary winding, conductors for permanently connecting the 'opposite terminals of the secondary to. spark plugs. in which ignition is to be producedV at separate instants, a fixed terminal likewise connected to each end of the secondary, and means for grounding each of said fixed terminals of the secondary in succession so that when one end ofthe secondary is ground,- ed the spark can be produced at the plug connected to the other end of the secondary, said means comprising a member of conduc-V tive material movable with respect to the g same axis as the circuit breaker and extending radially from said axis and having a terminal portion, the saidfixed terminals being disposed so that said terminal portion moves. into proximity thereto but does not i contact therewith periodically to short cirj cuit the spark plug connected' to each of said terminals in succession.

In testimony whereot I affix signature.y

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