US1726422A - Automobile brake - Google Patents

Description

Aug. 27, 1929. J. BUTLER AUTOMOBILE BRAKE Filed June 18, 1928 //VVN70R.

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Patented Aug. 27, 1929.

UNITED STATES PATENT OFFICE.

JAMES BUTLER, F HARRIETSVILLE, ONTARIO, CANADA.

AUTOMOBILE BRAKE.

Application filed June 18, 1928. Serial No. 286,433..

My invention relates to improvements in automobile brakes, and the object of the inment and construction of parts as hereinafter more particularly explained.

Fig. 1 is a face sectional View on line 1 1 Fig. 2.

Fig. 2 is a transverse sectional View through the centreof Fig. 1.

In the drawing like characters of reference indicate corresponding parts in each figure.

1 indicates the brake drum of any usual construction, and 2 the disc carried by the axle and from which the axle arm 3 extends in the usual manner. The disc 2 is provided with a peripheral recess 3 for a purpose which will hereinafter appear.

5 and 5 are parallel guides secured to the inner face of the disc and between which is slidably mounted a slide plate 6 having a slotted opening 7 through which the axle arm 3 extends. 8 is an arm extending from the plate 6 and provided with an offset portion 9 extending through the recess 6 so as to avoid the brake drum 1 as will be clearly seen on reference to Fig. 2.

10 and 11 are the brake shoes mounted to move diametrically of the disc 2 between the guides 10 and 10 and 11" and 11.

\Vhon a horizontal movement is imparted to the plate 6 between the guides 5 and 5 the brake shoes 10 and 11 are moved at right angles to the line of movement of the plate 6, such shoes being moved bodily parallel to this line of direction by means of the following mechanism which "I will now describe.

13 and 14 are links pivotally connected to the shoe 10 at 13 and 14", and 15 and 16 are links pivotally connected at 15 and 16 to the shoe 11. 17 and. 18 are bell cranks pivoted at 17" and 18" to the disc 2, and 19 and 20 are bell cranks pivoted at 19 and 20 also to the disc 2.

The long arms of the bell crank 17 and 18 are pivoted at 17 and 18 to the slide plate 6 and the long arms of the bell cranks 1-9 and 20 are pivoted at 19 and 20 to the opposite side of the slide plate 6.

The short arms of the bell cranks 17 and 18 are pivotally connectedat 21 and 22 to the inner ends of the links 13 and 14, and

the short arms of the bell cranks 19 and 20 at 23 and 24 to the inner ends of the links 15 and 16.

It will thus be seen that when the plate 6 is drawn in the direction of arrow, the short arms of the bell cranks 17 and 18, 19 and 20 will be swung outward simultaneously carrying the links .13- and 14, 15 and 16 in a corresponding direction and each end of the shoes to which they are connected evenly and parallel to thevertical centre line of the brake into contact with the inner periphery of the brake drum, such contact being even from end to end of each shoe, and thereby distributing the wear on the shoes so that they will not be worn unequally and thereby quickly lose their usefulness.

It will also be seen by my construction the whole surface of the shoe is carried into gripping contact with the brake drum so as to thereby provide, a maximum gripping effect between the shoes and the drum.

What I claim as my invention In an automobile brake, the combination with the brake drum and axle disc having a slotted opening at its periphery, of a slide plate mounted upon the inner face of the disc .to move diametrically, means extending through the slotted opening of the disc for operating the plate, brake slfoes arrangedat opposite points at each side of the plate, guides between which the brake shoes move, links connected to the shoes at each end thereof, a bell crank corresponding to each link pivotally mounted upon the disc, and a pivotal connection between one arm of the bell crank and its corresponding link, and a pivotal connection between the other arm of the bell crank and the plate.

I JAMES BUTLER.

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