US1555901A - Timer brush - Google Patents

Description

Oct- '6', 1925 1,555,901 a. v. BLACKFORD TIMER BRUSH Filed May 7, 1925 gmcnfoi Patented Oct. 6, 1925.

UNITED STATES A 1,555,901 PATENT OFFICE.

GILBERT V. BLACKFOR-D, OF INDEPENDENCE, KANSAS.

TIMER BRUSH.

Application filed May 7, 1925.

To all whom it may concern:

Be it known that I, GILBERT V. BLACK- ronn, a citizen of the United States, residing at Independence, in the county of Montgomery and State of Kansas, have invented certain new and useful Improvements in a Timer Brush, of which the following is a specification.

This invention relates to an improved brush for use in internal combustion engine timers, and it has particular reference to a brush which is especially, but not necessarily, intended for use in association with the type of distributor used in connection with Ford automobile engines. it is my principal aim to provide av brush which is capable of being substituted for the one now commonly employed, the improved brush being such as to fit into the conven tional distributor head or casing without requiring any alteration.

More specifically, I propose the provision of a brush which embodies an arm swingably mounted upon a collar to be mounted on the usual timer shaft, this arm being constructed at its free end to carry a ball contact for rolling contact with the usual circumferentially spaced contacts in the distributor casing.

It is a feature to construct the device upon the same principle as the conventional timer brush now used, that is, to provide an arm of substantially the same proportion and to substitute a ball contact for the usual roller contact and to locate this ball contact with respect to the axis of the timer shaft so that the advance and retard of this spark may be made in substantially the same way as now followed.

Other features and advantages of the iiivention will become apparent from the following description and drawings.

In the accompanying drawings forming a part of this application, and in which like numerals are employed to designate like parts throughout the same:

Figure 1 is an elevational View with a portion broken away and shown in section of a timer brush constructed in accordance with the present invention.

Figure 2 is an enlarged detail perspective view of the brush per so.

In carrying out the invention, I provide a collar 1, which is substantially identical with that commonly used, the collar in the present instance provided on one side with Serial No. 28,671.

an angular ear upon which the brush, designate-d as a whole by the reference character 3 is pivot-ally mounted. The brush preferably comprises an arm t, and this is bowed seiner." i longitudinally, and has its free end oiiset in an ang 1' direction as indicated at 5, the ezztremi of the free end being machined to provide asocket for reception of a rolling ball contact 6. 'lhe offset end is also externally screw threaded and a screw cap '4' is connected thereto in a manner to retain the ball in place. The cap is of course provided with a central opening of a size to permit substantially one half of the ball to project therethrough. At its inner end the arm is provided with. arsS which straddle the aforesaid lug 2, and are pivotally connected to the latter. Between its ends the arm is provided with a bridge beneath which the free end of the resilient fiat spring 10 extends, this spring being detachably connected by an appropriate fastener 11 to a projection carried by the collar 1. lVith this arrangement it will be seen that the spring will .XElt a yieldeble pressure against the arm to maintain the ball in yieldable rolling contact with the terminal contacts 12 in the distributor casing 13.

From the foregoing description it will be seen that l have evolved and produced a novel timer brush constructed to afford the proper leverage and to constantly maintain the ball contact in effective. wiping contact with the terminal contacts of the distributor casing. In this way bouncing of the ball in a radial direction toward or from the timer shaft is eliminated. The ball is easily removed from the cup provided by simply unscrewing the retaining cap. it follows that the flat spring is also removable, and under the arrangement specified. it cannot become corroded. nor is its proper tension interfered with. Practice has shown that the longer the timer brush is used, the deeper the groove it runs in its path of travel, and under this condition a better contact is assured.

It is thought that the foregoing descrip tion taken in connection with the drawing will enable persons skilled in the art to which the invention relates to obtain a clear understanding of the same. Therefore, a more lengthy description is thought u nnecessary.

lVhile the preferred embodiment of the invention has been shown and described it is to be understood that minor changes coming within the field of invention claimed may be resorted to if desired.

Having thus described the invention, what I claim as new and desire to secure by Let ters Patent is 1. A timer brush comprising an arm provided at its inner end with spaced attaching ears, the opposite end of the arm being formed with a ball socket, a rolling ball contact seated in said socket, said arm being externally screw threaded at its outer end, and a retaining cap for said ball embodying a screw threaded flange connected to the threaded portion of said arm, said cap being formed with an opening through which a portion of said ball projects.

2. In a timer brush, a collar adapted to be mounted on a timer shaft, an attaching ear carried by said collar, an arm pivoted to said car, a fiat spring detachably connected at one end to said collar, the opposite end of the spring having detachable connection with said arm, and a rolling ball contact removably mounted upon the outer end of the arm.

3. A timer bruslrcomprising an attachin r collar, an arm pivotally connected to saiil collar, said arm being provided adjacent its pivoted end with a bridge, a flat spring connected at one end to said collar and having is free end detachably connected with said bridge, the outer end of said arm being formed with a recess producing a ball socket, a ball seated in said socket, and a retaining cap for said ball detachably connected to said arm.

In testimony whereof I afiix my signature.

GILBERT v. BLACKFORD.

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