US605964A - And thomas j - Google Patents

Description

(N0 Model.)

E. E. LOOMIS & T. J. MOOBRS.

' TRACK PRIGTION BRAKE.

Patented June 21 18 l il?,

INVENTORS mm wlmm/goww BY ATTORNEY.

ilNrrED STATES ATENT `EEroE.,

EDwAED E. Loot/ns, O E ELMIEA, NEw YORK, AND THOMAS J. MoOEEs, OE ELossBURG, PENNSYLVANIA.

TRACK F'RICTION-BRAKE.

SPECIFICATION forming part of Letters Patent No. 605,964, dated June 21, 1898.

Application lcd. February 7,1898. Serial No. 669,382. (No model.)

To all whom t may concern:

Be it known that we, EDWARD E. LOOMIS, residing at Elmira, in the county of Chemung and State of New York, and THOMAS J. MOOERS, residing at Blossburg, in the county of Tioga and State of Pennsylvania, citizens of the United States, have invented a new and useful Improvement Vin Track Friction- Brakes, of which the following is aspeoication.

Our invention relates to improvements in brakes wherein the brake-shoes are applied directly to the track-rails and the object of our invention is to providea simple, cheap, and effective brake designed more especially to meet the requirements for mine-cars which are to be run down more or less steeply inclined grades. Heretofore the usual custom has been to sprag the wheels of such cars when starting down the grade. This oonsists in throwing a stick of hard wood in between the spokes of the wheel in such manner as to lock the wheels from turning. In this way the wheels are made to slide on the rails, and often in one descent a flat spot is worn in the wheel. lVheel-brakes of various descriptions have also been applied to these cars, but with suchbrakes the same objection obtains, and the wheels are soon worn flat in spots upon their periphery and become useless. Vith our device the wheels are free to revolve, and the Yonly expense attendant upon its use is the renewal from time to time of the brake-shoes.

XVe accomplishour object by the mechanism illustrated in the accompanying drawings, in which Figure l is a side elevation of a mine-car with our brake attached; Fig. 2, an end elevation, partly in section, showing the brakes set upon the rails, the brake on the right-hand side being shown in section on the line c; :t in Eig. l; andpFig. 3, a detail of the brake mechanism on a'larger scale.

Similar letters refer to similar parts throughout the several Aviews.

The brakes are preferably two in number arranged upon opposite sides of the car,either between the wheels, as shown in Fig. 1, or in front of the forward wheels, where the wheels are placed too close together to permit the lolcation of the brake between them. Each brake consists of a bracket A, bolted to the sides and bottom ofthe oar and provided with the vertical guideways B B,in which moves the brake-shoe holder C. This holder pro- .jects from the lower extremity of the bracket and is provided with an Outward extension vD, to which is bolted the brake-shoe E, which can be removed and renewed fromtime to time as it becomes worn out. A shaft H extends across from side to side beneath the bottom of the car and is journaled in the brackets A A, the ends of this shaftbeing squared where they project outside of the brackets. Upon this squared end at each side of the shaft is fastened a cam G, which operates upon the brake-shoe holder C within an L-shaped slot provided therein. On one side of the car an operating-lever I is fastened to the squared end of the shaft outside of the cam G andpextends upward, following the cont-our of the car with a length sufficient to give the necessary leverage. A toothed segment M is bolted to the side of the oar, and a pawl L, pivoted on the leverI, is adapted to engage the teeth on the segment to hold the brake upon the rail when the lever is drawn over to the left.`

" No springs are required to hold the brakes away from therails, since the weight of the operatinglever, when the" lever is thrown 'over to the right, ,will hold the cam G and holder C in elevated position. Moreover, when the cam G is thrown into the vertical position shown in Fig. 3, the brake-shoe will be locked against the rail and the pawl and segment act only as a safeguard against shocks and jars which would tend to throw the parts out of position. Alfrictionlroller may be applied to the end of cam G where it engages holder C, if so desired.

The L-shaped slot in the brake-shoe holder is formed with one arm horizontal and the other vertical, the horizontal arm being acted upon by the cam G to Operate` the holder and the vertical arm being adapted to receive the hub of the cam as the holder slides downward. The lever-arm of the cam l`Giisvery small as compared to the lever-arm of the operatinglever I, and it will be seen, therefore, that a small amount of power applied to the handle IOC) .l of the lever I will exert a proportionately large pressure upon the brake. In fact, a loaded car may be lifted by this brake mechanism, so that the wheels will completely clear the track and the car slide down the incline upon the brake-shoes alone.

While We have designed this brake With a view to applying it more especially to minecars, We do not Wish to confine ourselves to this particular application of it nor to the exact construction shown, which adapts it to this particular use, since it is quite evident that by changing the manner of applying the power the brake lnechauisinmay be adapted to other types of railway-cars Without departing from the spirit of our invention.

Te are aware of a track-brake in which the brake-slice holder is operated by means of au 'eccentric which travels in an elliptical slot in `the holder. This arrangement, however, will not meet the requirements in the type of brake to which our invention is vespecially7 applicable, since an'eccentric and elliptical slot to produce the same amount of travel in the brake-shoe are required to be of so large proportions as to forbid their being used in the confined space Within which our brake is to be applied. y

That We claim, and desire to secure by Letters Patent, is-

l. A brake mechanism comprisinga reeiprocatiu g brake-shoe holder, a guideway therefor, a cam operating in an L-shaped slot in the holder, and a lever to operate the cam to set and release the brake, substantially as described.

2. A brake mechanism, comprising a pair of side brackets, brake-shoe holders guided in the brackets and provided with L-shaped slots, a shaft j ournaled in the brackets, cams attached to the shaft to operate upon the holders Within said slots, and an operating-lever attached to the shaft, substantially as described.

In testimony whereof We have aflixed our signatures in presence of two witnesses.

E. E. LOOMIS. T. J. MOOERS.

Witnesses: CHAs. S. ROCKWELL, L. G. IIoR'roN.

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