US19192A - Kailroad-car beake - Google Patents

Description

3 Sheets-Shea? S. GUMAER.

Car Brake.

Patented Jan 26, 1858,

AM.PHDTO-LITHO. CO. NX (OSBDRNE'S PRdRESS 3 SheetsSheet 2.

S. GUMAER.

Car Brake.

Patented Jan. 26, 1858.

3 Sheet$-Sheet. 3.

s. GUMAE R.

Car Brake.

No. 19,192. Patented Jan. 26. 1858.

AM. PHOTO-THO. C0- N.Y-(0SBRNE'S PROCESS.)

UNITED STATES PATENT OFFICE.

SAMUEL GUMAER, OF CHICAGO, ILLINOIS.

RAILROAD-CAR BRAKE.

Specification of Letters Patent No.

To all whom it may concern Be it known that I, SAMUEL GUMAER, of Chicago, in the county of Cook and State of Illinois, have invented a new and useful Improvement in Railroad-Car Brakes; and I do hereby declare that the following is a full, clear, and exact description of the construction and operation of the same, reference being had to the annexed drawing, forming part of this specification, in which- Figure 1 is a side elevation of a car truck with my improved brake attached; and Fig. 2 is a vertical longitudinal section of the same.

Similar characters of reference in the several figures denote the same part.

The object of my invention is to check the rotation .of the wheels without stopping them, and arrest the motion of the car by the friction of a shoe forced upon the rail,

my invention consisting in the peculiar combination of devices hereinafter to be set forth for effecting the operation continuously.

In the drawing F is the truck frame, A A the axles and W WV the wheels, all of ordinary construction.

R R are the rubbers and S is the shoe jointed therewith at a a. This shoe has a standard I) running upward through the shaft 0. A spring [Z incloses this standard, and being attached to both shoe and shaft draws the shoe upward when pressure is removed from it. There are also springs e 6 connecting the rubbers R R with the hangers h of the shaft 0.

Upon the shaft r;- is a tri-branched cam C operated by lever Z or in any suitable manner, to first force the rubbers R R against the wheels, and then press the shoe S down upon the rail. There is a flat spring f inside the shoe upon which the toe of the cam acts in forcing down the shoe. This gives the necessary degree of elasticity to the shoe, and renders it capable of rising over any inequality of the road, or obstruction on the rail, in the same manner as the springs of the car give an elastic bearing of the wheels upon the rail. This elasticity is of the utmost importance in braking with a shoe upon the rail, as rigid pressure upon the rail is productive of injury to the entire 19,192, dated January 26, 1858.

mechanism, and has been a great objection to this mode of arresting the motion of cars. On removing the pressure of the cam, the springs d and e lift the rubbers and shoes, the standard b serving as a guide.

The rubber may be applied outside of the wheel, as shown at X in the drawing, if desired. And if necessary the rubbers may be applied above the axes of the wheels, these modifications requiring nothing but suitable changes of levers and rods.

The branches of the cams are so constructed that branches m and a shall engage and force the rubbers against the wheels, before branch p acts upon the shoe.

By this construct-ion the velocity of rotation of the wheels is first diminished by the rubbers, and then the car is stopped by the pressure of the shoe on the rail. This progressive application of rubbers and shoe I deem important, and consider it as efiecting a better result than either a simultaneous pressure on wheels and rail, or a pressure upon the rail previous to acting upon the wheels. For the simple reason that pressure upon the rail when the train is in rapid motion is liable to throw a car from the track. The system I propose reduces the velocity of the car and then applies the arresting force to the rail, thus causing the stopping of the train without a sudden stoppage of the rotation of the wheels, or a dangerous pressure of the shoe upon the rail. In these important features of rendering the pressure on the rail elastic, and in regulatin the time of pressure .on the rail, I consi er my construction different from all others for the same purpose.

I disclaim all combinations of shoes and rubbers for braking upon both rail and wheels, when such combinations are designed, and arranged to act, either simultaneously, or first upon the rail. I also disclaim all shoes acting rigidly upon the rail, as forming no part of my invention. I further disclaim the use of cams in applying brake rubbers.

What I do claim as new and of my own invention and desire to secure by Letters.

Patent, is

The loosely hung rubbers and spring bottomed shoe connected as described in combination with the tri-branched cam, when the lower toe of the cam acts upon the signed my name before two subscribing Witspring, and the said parts are all relatively nesses.

the Wheels prior to the application of the 5 shoe to the rail, substantially as and for the purposes hereinbefore set forth.

arranged that the rubbers are applied to SAM'L GUMAER Witnesses:

GEO. PATTEN, JOHN S. HOLLINGSHEAD.

In testimony whereof, I have hereunto

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