US1074984A - Spark-timer. - Google Patents

Description

H. M. SGHEIBE.

SPARK TIMER.

APPLIGATION FILED NOV. 6, 19'11.

1,3?4L984. k Patented Oct. 7, i913.

WHNESSE K XOR I filw a 4 3/ I BY A QYw s5. r/ZQWW.

/ ATTORNEY shaft 1 of a small generator.

cam 2 is surrounded by a cylindrical sleeve UNITED STATES PATENT oFF o SYLVANIA.

Application filed November 8 To all whom it may concern.

Be it known that I, HAROLD M. SOHEIBE, a citizen of the United States, and a resident of Wilkinsburg, in the county of Allegheny and State of Pennsylvania, have invented a new and useful Improvement in Spark-Timers, of which the following is a specification. My invention relates to combined interrupters and'spark timers for use with internal combustion engines, and it has for its object to provide a simple and effective device for simultaneously adjusting both the degree of advance of the spark produced by the interrupter with relation to the engine piston and the distance between the interrupter contact members, so that the periods of engagement thereof may be made substantially uniform at all engine speeds.

- My invention is illustrated in the accompanying drawing, Figure 1 of which is a vertical sectional yiew through a combined interrupter and spark advancer that isv con structed in accordance therewith, and Fig. 2 is a view in end elevation and in section of the device shown in Fig. 1.

My invention is adapted to be employed in connection with any constant-pressure source of current for ignition or other purposes, and to be driven by the engine at the proper speed, it being shown in the present instance mounted at the end of the The device comprises a cam 2 that is secured in any suitablemanner. upon the end of the shaft 1, 21 1 except for two small diametrically opposite recesses, is of substantially cylindrical contour, with its axis coincident with the axis of the shaft. The

4 that is formed integral with, or is otherwise suitably secured to, an end bracket 5 of the gcnerator,its lower rightdiand por-' tion being omitted or cut away for something" more than 90 degrees. The sleeve 4 is eccentrically disposed with respect to the shaft 1 and the cam 2, its axis being indi cated at 8. The sleeve 4' is closely suruounded by, and serves as a bearing for, a cylindrical portion-6 of a shell or frame 7 that is provided with arms or lugs 8 for the attachment of means, whereby the shell or frame may be manually rotated by the driver or operator.

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Specification of Letters Patent.

roller 11 Patented Oct. 7-,

, 1911. Serial No. 659,220.

Pivotally mounted within in p which is :ifgalnst the substantially mounted a roller 11 that bears.

horiaontal arm of the of a screw 13 carried by, but insulated froma the shell or frame 7, the said screwqbein distance between 1t and vice may be insured. To this end, the screw should be so adjusted that the roller 11 will just seat itself in the recesses in the cam 2 when the contact terminal 12 engages the upper end of the screw, and the remaining arts occupy the positions shown,.which' are for fully-retarded spark conditions. A, A spring 14: serves to resiliently press the into engagement with the surface of the cam 2, and to cause the contact term'inal 12 to engage the end of the screw 13 vhen the roller drops into one of the recesses in the cam. A cover 15 for the shell r frame 7 is retained in position by means of a spring 16 that is carried by tl1e end bracket 5 of the generator. In the operation of the device, the frame 7 occupies the position shown when the engine is notin operation or is operating at slow speeds, and, as the speed of the engine inczfcases, the operator or driver manually moves the same in order to advance the position of the roller 11 so that it will drop into the recesses in the cam earlier in its period of rotation, thereby advancing the spark with respect to the engine pistons. At the same time the roller 11 is moved farther away from the-axis of rotation of the cam, since it turns about the axis 3, rather than about the axis of the cam. The contact ter minal 12 is then located closer to the end of the screw 13 when the roller 11 bears upon the cylindrical portions of thecam, and, consequently, it is required to move a less distancein order to engage the end of the said screw than previously. The degrees of angular movements of the cam during which the roller 11 occupies the recesses therein, of course, remain the same, irrespective of the position ofthereller as determined by e i e ,a t i mnie if'tbntt fhei the shell frame 7, is a small bell crank lever 9 havmg a substantially vertical forked. amno 3 p outer surface of the cam 2 bell pies the position shown. I engagement of the sau contact terminal shorter distance in order to engage the screw 13, it will engagesooner and disengage later when the roller 11 is advanced in position, and consequently longer, than when it occu- The periods of may, accordingly, be maintained substantially uniform at all engine speeds by the proper adjustment of the position of the frame 7.

I claim as my invention: l

1. A spark timer comprising a rotatable cam, and a switch member actuated thereby and adjustable bodily in. eccentric-relation with respect thereto.

2. A spark timer comprising a rotatable cam having a plurality of recesses but being otherwise of cylindrical contour, and a pivotally mounted switch member that is actuated by the cam and is adjustable bodily about an axis that is eccentric with respect to the axis of rotation of the cam. 4

3. A spark timer comprising a rotatable cam, a sleeve surrounding the cam, the axis of which is eccentric with respect to the axi: of rotation of the cam, a movable frame mounted upon the said sleeve, and a switch member pivotally mounted in said frame and actuated by the cam.

41. A. spark timer comprising a rotatable cam, a circuit making and breaking switch one at the members of which is actuated by said cam, and a support for said switch that is rotatively adjustable about said cam upon an axis which is eccentric to the cam axis.

5. A spark timer comprising a rotatable cam, and a circuit making and breaking switch the movable member of which is actuated by said cam and is also eccentricaliy and independently adjustable with reference to the cam axis.

In testimony whereof, I have hereunto subscribed my name this 31st day of Oct.

. HAROIJ) M. SCHEIBE. Witnesses C. B. Bnesr, B. B. Hines.

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