US1303523A - Timer-distributer mechanism - Google Patents

Description

E. J. TOMLINSON. TIMER DISTRIBUTER MECHANISM.

APPLICATlON FILED NOV.3.1917.

Patented May13, 1919..

WW A TTORNEY UNITED STATES PATENT OFFICE.

EDWARD J. TOMLINSON, OF NEWARK, NEW JERSEY, ASSIGNOB TO SPLITDORF ELECTRICAL COMPANY, OF NEWARK, NEW JERSEY.

TIMER-DISTRIBUTEE MEEHANISM.

To all whom it may concern:

Be it known that I, EDWARD J. ToMmNsoN, a citizen of the United States, residing at Newark, in the county of Essex and State of New Jersey, have invented certain new and useful Improvements in Timer-Distributer Mechanism, of which the following is a specification.

In the use of timer distributers for b8113- tery ignition systems some means should be provided for the adjustment of the contact operating device, whereby when the timer distributor is installed on the engine with which it is to operate, the proper timing of the contact with respect to'the travel of the engine piston may be readily obtained.

In the past it has been customary to use a split shaft or a supplemental shaft end attached to the main shaft and to fasten the cam which operated the movable contact member thereto by meansot' a taper screw which spreads the split portion of the shaft or supplemental shaft so that it grips the side surface of the hole in the cam which is placed upon the split end of the shaft.

Another method that has been. used to some extent is to provide a, taper on the end of the operating shaft and cooperating taper hole in the cam, drawing the cam down on to the tapered shaft by means of a nut or screw. During the final tightening of the nut or screw the cam is very apt to be turned out of its proper position thus throwing out the timer, all of which is well understood by one skilled in these matters.

It is the primary object of my invention to provide a mechanism which may be readily and accurately adjusted for purposes of timing and which may be locked securely in place without any danger, during the locking process, of throwing the cam out of its properly adjusted position.

Another object of my invention is to provide a mechanism of the character set forth in the principal object which is simple in construction and hence cheap to manufacture and is a great aid inthe saving of time in adjusting the timer to the engine.

These and other objects will be apparent after a study of the specification and drawings, wherein Figure 1 is a sectional elevation of a timer distributer with certain parts broken away to show features herein set forth.

Fi 2 is a top plan view of the timer mem er without the distributer.

Specification of Letters Patent.

Patented May 13, 1919.

Application filed November 3, 1917. Serial No. 200,175.

Fig. 3 is an enlarged perspective end view of the operating shaft.

Fig. 4 is an enlarged perspective view of the contact and distributer o crating device.

Referring now to the detai sin which like numbers refer to corresponding parts in the different views, 1 is a timer plate upon which is mounted a movable contact member 2 carrying contact 3 which is adapted to cooperate with a stationary adjustable con tact 4 that is carried by an insulated block 5 fastened to the plate 1. 6 is a condenser which is adapted to be connected across the breaker points 3 and 4 in the usual manner. 7 is a bearing member supporting shaft 8 which has an annular groove 9 near its end to receive a thrust collar 10, which in Fig.

1 is broken away so as to show the groove 9. The end of the shaft 8 terminates in a spindle 11 having internal threads 12. At the base of the spindle 11 on the shaft 8 is a number of teeth or indentations l3 circumferentially arranged around the face of the shaft. The teeth 13 may be cuton the end of the shaft or they may be indented thereon by a suitable press after which the shaft maybe ground to the proper diameter, etc., or the portion from the teeth 13 to the annular groove 9 may be made up in the form of a small collar with the teeth 13 cut or punched therein and the collar pressed on to the end of the shaft 8. The exact ,manner of providing the teeth or indentations on the end of the shaft may be varied as will be readily understood. The same applies to the teeth or indentations 14 which are formed in the end face of cam 15, it being understood, however, that the teeth or indentations 13 and 14 are made to 006perate with each other as will be explained.

The cam 15 has a hole 17 passing there- .through and terminates in a thimble 16 having a shoulder 18 against which screws 19 and lockwasher 20 abut. A slot 21 is cut across the end of the thimble, preferably ofl. center, to receive a distributing finger 22 that distributes the high tension current to the contacts 23-of the distributer block 24 in the usual manner.

In order to get accurate timing, I prefer to use as many indentations or teeth in the end of the shaft-8 and cam 15 as is consistent with good and speedy manufacture. preferably the number of teeth or indentations should be one more or less than a multiple of the number of surfaces on the cam. In

the Figs. 1 and 2, I have shown a six lobe cam and I have been able to secure close and accurate timing with a cam of this kind by utilizing 31 teeth or indentations in both the shaft and cam. It will be seen that 31 is one more than five times the number of cam surfaces, which is six and with this arrangement I have found that if on timing one cam surface did not operate the movable contact member at the proper point it is merely necessary to turn the cam around until the teeth or indentations will go into enmeshment with the cam surface that is in proper relationship with the movable contact member. After this adjustment 'is secured it is only necessary to draw down the screw 19 thus securely engaging the teeth or indentations so that relative rotative movement between the cam 15 and driving shaft 8 is absolutely prevented and of course, the screw and lockwasher prevent any longitudinal motion between the driving shaft 8 and cam 15, thus holding the teeth or indentations in positive enmeshment. In the enlarged views shown in Figs. 3 and 4 no attempt is made to show the requisite number of teeth required to fulfil all the conditions of my invention. It will be readily understood that numerous changes may be made in the various details relating to my invention without departing from the spirit of the same or the scope of the appended claims.

Having thusdescribed my invention What I claim is k" 1. In an ignition timer distributer, the combination of an operating shaft terminating in an internally threaded spindle with teeth'cut on the end of the shaft at the base of said spindle, a contact operating member consisting of a hollow cam having a thimble projecting there-from and having teeth out in its end face, said cam and thimble adapted to be carried on said shaft spindle, a screw seated in said thimble and engaging the threads of said spindle to hold said teeth in permanent enmeshment, and a distributing finger carried by said thimble.

2. In an ignition timer distributer, the combination of an operating shaft terminating in a spindle with indentations on the end of the shaft at the base of the spindle, a contact operating member consisting of a hollow cam having a thimble projecting therefrom and having indentations in its end face to 'coact with the indentations on said shaft end, said indentations being in number equal to one more or less than a multiple of the number of said cam surfaces, said cam and thimble being adapted to be carried on the shaft spindle with means for holding the indentations in Working relationship and a distributing finger carried by said thimble.

In Witness whereof, I 'aflix my signature.

EDWARD J TOMLINSON.

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