US1311904A - samuel c - Google Patents

Description

S. C. McKEOWN.

BRUSH HOLDER. I APPLICATION FILED SEPT- 25. 1911.

Patented Aug. 5, 1919.

UNITED STATES PATENT OFFICE.

smear. c. mxnown, or ms'r ELECTRICAL compan ORANGE,

NEW JERSEY, ASSIGNOB TO SPLITDORI- OF NEWARK, NEW JERSEY. I

Barren-Homes.

Specification of Letters Patent.

' Patented Aii 5, 1919.

Application filed September 25, 1917. Serial No. 188,119.

electrical apparatus used in connection with ignition systems for internal combustion en ines.

use in connection with a magneto used for the urpose of producing and .distrrbutlng sparking current to the sparklng devices located in the various engine ,cylmders. Magnetos used for this purpose usually have .a distributor block which carries the contacts to which the spark plug wires are attached; at the same time the block acts as a housing for the distributing finger which serves as a medium for conducting current from the secondary of the high tension coil to the various distributer points byway of a distributer brush carried by the distributing disk or finger.

In order that the brush carried by the rotating distributing finger may be kept in its proper working position a sprin of some kind is utilized to continually orce the brush outward from its retainer and when the block is removed for any purpose whatsoever, the distributer brusli' will popout of it retainer unless restrained by some means.

One of the objects of my invention is to provide a brush holder which has a restraining means suitable for retaining the brush in the holder when the distributer block has been removed. I

Another object of my invention is to provide a retainer which will serve as a means for withdrawing the brush from the holder itself whereby damage to the brush and its operating spring is reduced to a minimum. That is to say, the retainer acts as a protector for the (brush and spring.

These and other objects will be apparent to one skilled in the art after astudy of this specification in connection with the drawing, in which Figure 1' is a fragmentary sectional View of a portion of a distributor block with the distributing finger and means for driving the same.

y invention is particularly adapted for since this is all old and well I Fig. 2 shows one form of my'brush holder set lnto the distributing finger but with the retainer nearly withdrawn from the holder.

Fig. 3 is a modified form of brush holder and retainer with the retainer partly withdrawn from the holder.

,Fig. 4 is a sectional view of Fig.2 along the line 44, but with the retainer farther in the holder.

Fig. 5 is another which may be used for the retainer shown in Fig. 2.

f Fig. 6 is another way of holding the brush in the retainer.

Referring now articularly to the details, 1 isa portion oft e end late of a magneto within which is moun a ball bearing 2 that carries a distributer gear 3. Gear 3 is driven in the usual way from; the pinion on the armature or. rotor of the magneto but inventionfurther deof-the magneto does The sleeve 4 to which carries an insulating forms no part of my scription of this part not appear necessary.

the gear 3 is attached finger 5 having a stem 6 in which is molded a metal insert 7, which carries a brush 8 for the purpose of collecting the high tension current from any suitable connecting device. Preferably molded integrally with the finger 5 is a brush holder 9 adapted to carry a" retainer 10, which in the forms shown in Figs. 2 and4 is U-shaped. The retainer 10 is indented along one side at 11 which indentation serves as a guide for the brush 12 which has agroove 13 to coact with the guide 11. The brush'holder 9 also has an indentation 14 that matches with indentation 11 of the retainer so that the retainer 10 is guided in the brush holder 9. Attached to the bottom of the brush 12, in any. suitable manner such as plate 15 which may be soldered to the brush 12', is a rod 16.

understood and form of brush retainer having a head 17 placed thereon after the rod 16 has been passed through the hole in the bottom of the retainer 10. A spring 18 is supported [by the rod 16 between the bottom of the retainer and the bottom of the brush 12 and serves to push the brush out- I ard to hold it inits normal tion, which, as shown in Fig. 1, is against the pathway of the distributer block 19 in which are molded a number of inserts 20 corresponding to the number of engine cy1- working posiconnected to the contacts 20 by the Openings 21 and screws passm the threaded holes 22. The l'stributer block 19, as shown, has other contact points 23 but since these form no glart of my present invention they are not rther described herein.

It will be seen by reference to Fig. 2 that when the retainer 10 and brush 12 are in 7 their normal working position the head 17 The modification may be of bolt 16 passes through a hole 24 in the bottom of brush holder9 and the insulated part of the finger 5. When the distributer block 19 is removed from the magneto the brush 12 will move outwardly in the retainer 10 only so far as the head 17 on the bolt 16 will permit it and in order to withdraw the brush instead of pulling directly thereon the retainer 10 is seized and retainer and brush together are withdrawn from the holder 9. shown in Fig. 5 illustrates a complete box type of holder for the brush. One ofthe side walls is slit at 25 in order that the retainer 26 may expand enough to frictionally engage the side of the holder 9 to keep the retainer 26 frictionally in place therein in the same manner that the retainer is held in lace as will be seen by its position in ig. 2 wherein the arms are so formed as to have a certain outward ten sion whereby when the retainer 10 is in its normal working position in the holder 9 it will grip the side walls of the holder.

In the modified form shown in Fig. 3 one side of the retainer has a hook 27 formed thereon and this side has a slight set at 28 so that when the retainer is withdrawn from the holder the hook 27 will spring outward as shown in Fig. 3 whereby the 'brush 12 readily withdrawn from the retainer. In this modified form the brush, retainer and holder have grooves and guideways corresponding to the form shown in Fig. 2 but a diiferent type ofspring attachment is used for the movement of the brush.

In Fig. 6 the brush 12 has a hole 29 through it and the rod 16 extends through a longitudinal hole that enters the crosshole 29, and is upset at 30 so it will not pull out of the longitudinal hole. This makes a very cheap and quick attachment of the brush to the retainer.

While I have shown certain forms of my invention it will be apparent that numerous changes and alterations may be made in the various details without departing from the spirit of my invention or the scope of the appended claims.

Having thus described my invention what I claim is z-- I 1. In a device ofthe class described, a

brush havin a channel therein, a retainer for the brus having a guide adapted to cooperate with said channel, a holder for the retainer, a spring mounted within the retainer, for moving-the brush outward to take up wear, and means associated with the brush and retainer for limiting the outward movement of the 'brush as described.

2. In a device of the class described, a brush having a channel therein, a retainer for the brush having a guide adapted to 00-, 2

operate with said channel, a holder for the retainer having a guide adapted to 006R:

ate with the guide in the retainer, a spring mounted within the retainer for moving the brush outwardly to compensate for wear, and means cooperating between the brush and retainer for limiting the outward 'movement of the brush for the purpose described.

3. In a device of the class described, a brush having a channel therein, a retainer for the brush having a guide adapted to cooperate with said channel, a holder for the retainer, a pin attached to said brush and passing through the bottom of the retainer and having a head thereon, a spring supported by said pin and acting between the brush and retainer to move the brush outwardly to compensate for wear, said head on the pin servin to limit the outward movement of the rush and a clearance hole through and below the holder for the movement of said pin and head thereon.

4. In a distributing device of the class described, a block of insulating material, a brush holder molded permanently therein, a resilient brush retainer adapted t0 frictionally fit within said holder, a brush movably mounted within said retainer, a spring to move the brush outwardly as the same wears, andmeans associated with said brush and retainer for limiting the outward movement of the brush.

5. In a distributing device of the class described, a block of insulating material, a brush holder molded permanently therein, a resilient brush retainer adapted to frictionally fit within said holder, a brush movably mounted within said retainer, a spring to move the brush outwardly as the same wears, and means associated with said brush and retainer for limiting the outward movement of the brush, said retainer serving as a means for withdrawing the brush from the holder whereby damage to brush and spring

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