US722333A

US722333A - Electric igniting device.

Info

Publication number: US722333A
Application number: US4489401A
Authority: US
Inventors: Friedrich Sturm
Original assignee: Individual
Current assignee: Individual
Priority date: 1901-01-26
Filing date: 1901-01-26
Publication date: 1903-03-10
Anticipated expiration: 1920-03-10

Description

PATENTEDIHMAR. 10,1903.

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F. STURM.

ELECTRIC IGNITING DEVICE.

APPLICATION FILED JAN. 20.1901.

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PATENTBD MAR. 10, 1903.

P. STURM. ELECTRIC IGNITING DEVICE.

APPLIGATION FILED JAN. 26, 1901.

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FRIEDRICH STURM, OF STUTTGART, GERMANY.

ELECTRIC IGNITING DEVICE.

SPECIFICATION forming part of Letters Patent N 0. 722,333, dated March 10, 1903.

Application filed-Ianuary 26, 1901. Serial No. 44,894, (No model.)

To all whom it may concern:

Be it known that I, FRIEDRICH STURM, a citizen of the German Empire, residing at Stuttgart, in the Kingdom of lViirtemberg, Germany, have invented certain new and useful Improvements in Generators for Ignition Devices; and I do hereby declare the following to be afull, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use same.

The electric devices for igniting the explosive mixtures of gas engines, motor cars, and the like as hitherto employed all exhibit the drawback that the period of ignition of the explosive mixture in the cylinder cannot be altered at any time as regards the position of the moving cylinder-piston. The socalled front or back ignition cannot be regulated in a suitable manner, and thereby the number of revolutions and action of the motor cannot be altered. In the magnetoelectric igniting devices at present most frequently employed and which have reciprocating armatures, the possibility of forming a spark, as is well known, is only presented at the moment when the surfaces of the armature-arms move away from the edges of the pole-pieces. At this moment in order to produce a spark, and thereby effect the ignition, the igniting-lever situated in the explosionchamber of the motor must also simultaneously separate itself from the igniting-pins. The movement of the armature and that of the igniting-lever must thus exactly correspond in order to produce a sure working of the former. As the ignition of the explosive mixture in the cylinder must take place only at a given position of the piston, the movement of the piston must also coincide with that of the igniting device and of the igniting-lever. Now, as every expert knows, the production of a coincidence in movement of the piston, armature, and igniting-lever precisely is not always a simple matter and requires exact transmission-gear for operating the armature and also an exact adjustment of the lever for operating the igniting-lever. The ignition of the explosive mixture, moreover, always takes place in a definitely-determined position of the piston.

The present invention has for its object to provide a separate arrangement in the igniting device for altering the moment of ignition-that is to say, to allow of the ignition taking place in any suitable position of the piston. By this means the previously-mentioned coincidence in the movements of the armature, igniting-lever, and piston is more easily brought about, and, further, the action of the motor even while running may be suitably adjusted or altered, which is of the highest importance, more particularly for motor-cars. This peculiar arrangement consists in mounting the pole-pieces adj ustablythat is to say, revolubly instead of firmly, as previously-in such a way that the point of separation of the edges of the armature and pole-pieces may be shifted and the moment of ignition be thus altered.

In the accompanying drawings, Figures 1 and 2 are longitudinal and cross sections, Fig. 3 a plan view, and Fig. at a side view, of a generator provided with adjustable polepiecesfor instance, with three magnets. Figs. 5 and 7 are respectively an elevation and cross-section of the adjustable polepieces connected with one another; and Fig. 6 is a longitudinal view, partly in section, of the armature here employed, which is, for instance, assumed to be constantly rotating. Fig. Sis a diagrammatic view illustrating one apparatus which may be employed for the adjustment of the device for moving the igniting-lever.

Fixed poles 15 are screwed on magnets 6. Their inner part is turned out semicircularly to receive adjustable pole-pieces 9, which are revolubly mounted. Within the latter there lies an armature 1, plates 2 being screwed on the ends of its arms to carry pins 3 and 4, which form the axis of rotation for the armature. These pins are mounted in bearings 5, screwed on the bed-plate 7 of the device and on the fixed poles 15.

The generator is driven in the ordinary manner by means of a cog-Wheel, chain-wheel, lever, or the like, (notshown in the drawings,) mounted on one of the pins 3.

The two adjustable pole-pieces 9 are connected with one another at both ends by means of disks 24:, which lie in recesses in the bearings 5 and for which thepins 3 and 4 of the armature serve as guides. A loosely-revoluble disk 10, mounted on the hub of one bearing 5, serves for adjusting the pole-pieces 9, which disk is coupled, by means of an eye 11, with a rod 12 and may be revolved to a suitable extent by means of this latter. The disk 10 is firmly connected with the polepieces 9 by means of screws 14, which pass through segmental slots 13, formed in the bearing 5, so that by turning the disk the pole-pieces are also turned with it. By a suitable adjustment of the disk 10 the moment of ignition may thus be suitably altered. Of course the adjustment of the pole-pieces must be accompanied by a suitable adjustment of the device for moving the igniting-lever, which may be effected most simply by adjusting in a similar manner the cam or the like which operates the igniting-lever when the pole-pieces are adjusted by means of the disk 10, such adjustment taking place from this latter. Such a means is shown in Fig. 8. In this construction the ignition-arm to must separate from the ignition-stud 'Lt at that moment when the edges or margins of the rotary armature leaves the edges of the adj ustable pole-pieces. This may be done by providing the disk 10 (which is connected to the adjusting-lever 2 by a coupling-rod 12, pivoted to extension 11 of said disk 10) with an extension 11, to which is connected the end q of the rod 19, said end q having a slot 0,

through which passes a screw 1*, threaded into the extension 11. The end (1 of the rod p is acted upon by the continually-rotating cam m, mounted on the armatureshaft, and transmits its reciprocating motion through the rod '15 to a rock-arm i), which oscillates the lever or electrode 10 into and out of contact with the stud u, the rod 15 being acted on by a spring 8 to return it to its normal position. The armatnre-circuitis through the wire 0 to the stud u and through the rods 19 and t to the lever to. This structure is all old and well known and forms no part of my invention, except the arrangement of the same in combination with the adjustable disk 10, and the adjustable pole-pieces of the generator and its method of operation will be obvious to those skilled in the art in view of the description hereinbefore given.

In order that the same igniting device may be utilized for motors having very large and very small numbers of revolutions, a great conductive resistance is necessary in the armature, for which object very thin wires of only approximately thirty millimeters in thickness are employed and which are insulated from one another in layers on the armatu re, although such wires are already well insulated themselves. One end of the armature-wire is insulated from the device by a vulcanite socket 17 being inserted in the hollow pin 4 of the armature, in which socket a conducting-pin 16 is inserted, on which the end of the wire is held fast by means of a screw 18. The other end of the armaturewire is connected to the armature-core in a well-known manner. The pin 16 encounters a pin 21, which is elastically and flexibly mounted in a metal yoke 19 and is also screwed firmly to a set-screw 22. One Wire 0 leads from the pin 21 to the igniting-pins, so that by means of this wire the coil 8 of the armature 1 is connected with the igniting-pins, while the igniting-lever is conductingly connected with the igniting device by means of the mechanism which operates it. When the igniting-pins and igniting-lever encounter one another,contact is established. The metal yoke 19 is insulated from the igniting device by means of non-conducting intermediate layers 20 of hard rubber or the like.

If the disk 10 and pole-pieces 9 be adjusted by means of the coupling-rod 12, operated from a suitable place, the moment of ignition will be altered with regard to the actual position of the piston, so that the ignition is adjusted for a suitable position of the piston, and front or back ignition may be employed, as required. The number of revolutions of the machine and their effectiveness is thereby influenced, which is of great advantage, more particularly for motor-cars.

The adjustable pole-pieces can of course be employed equally well in igniting devices with reciprocating armatures as in those with constantly-rotating armatures.

By the use for the armature of a wire coil which offers a greater resistance the same igniting device can be employed for machines making any number of revolutions per minutesay from twenty up to three thousandwhile for motors with a greater number of revolutionsforinstance, over eight hundred per minutea constantly-rotating armature may be employed in place of a reciprocating armature.

The igniting devices hitherto employed with reciprocating armatures had also, as is well known, the drawback of not working correctly when the number of revolutions exceeded eight hundred per minute so far as regards a sure igniting, as at each double oscillation two dead-points of the armature have to be overcome, so that the number of revolutions capable of being executed by motors provided with such igniting devices is limited. The igniting devices with constantly-rotating armatures may, on the other hand, as already pointed out, be employed with a constantlylutions.

Having now particularly described and asp certain ignition for the largest number of revo- 2. The combinati0n,with an igniting-lever, and adjustable means for operating the same, of a generator arranged to supply electricity through the igniting-lever, and provided with an adjustable pole-piece.

3. The c01nbination,with an igniting-lever, and an adjustable cam for operating said lever, of a generator arranged to supply electric current through the igniting-lever, and provided with adjustable pole-pieces. no

In testimony whereof I have affixed my signature in presence of two witnesses.

FRIEDRICH STURM. Witnesses:

A. DRAUTZ, WM. HAHN.