US766915A - Air-brake accelerator. - Google Patents

Description

No. 766,915. PATENTBD AUG. 9, 1904. V. G. TASKER. AIR BRAKE ACCELERATOR.

APPLICATION FILED 0OT.15, 1903.

H0 MODEL.

able piston J.

.IINiTEn STATES Patented August 9, 1904.

PATENT OEEicE.

VERNON C; TAgKEIt. OF W .ASlE-IINGTHDN, DISITRIOTI OF COLUMBIA, ASSIGNOR TO SOOIETE (arENERALE DES FREINS LIPKO'WSKI, OF PARIS, FRANCE,

A FIRM.

AIR-"BRAKE ACCELERATOR.

SPECIFICATION forming" part of Letters Patent No. 766,915, dated August 9, 1904.

Application filed October 15, 1903.

To all whom, it ntrty concern.-

Be it known that I, VERNON O. Tasman, a citizen of the United States, residing at Washington. District of Columbia, have invented certain new and useful Improvements in Air- Brake Accelerators, of which the following is a full, clear, and exact description.

The object of the invention is to provide improved means for quickly exhausting air from the train-pipe under each ear in order to apply maximum-braking effect in case of emergency without appreciable delay in the transmission of said efiect throughout the train.

In describing the invention in detail referonce will be had to the accompanying drawings, wherein like characters denote corresponding parts.

Figure 1 is a central vertical section through the accelerator transverse to the train-pipe, and Fig. 2 is a vertical longitudinal section through the train-pipe and a portion of the accelerator along the line 2 2 of Fig. 1.

In the drawings, A is a casing having at its lower extremity a longitudinal chamber B in line with the train-pipe T and communicating therewith. In said chamber B is a perforated hollow cylinder 1). serving as an airstrainer and registering with the train-pipe, being centered at E and F and secured against endwise movement by a flange (ii.

A branch pipe U from the bottom of the chamber B communicates with a triple valve (not shown) to actuate the brakes. The chamber B thus corresponds in a general way with the usual car drain-cup.

Aside from chamber B the casing A is situated entirely above the train pipe, the better to drain the parts therein and prevent accumulation of drip from the train-pipe. The

said upper part of easing A is divided into two compartments by the horizontally-mov- One of said compartments, K, forms an air-reservoir closed by the cap M and gasket N and communicates solely through the small perforation O with the other compartment, L, which in turn communicates freely with the train-pipe. The piston J has an axial prolongation P of star-shaped cross- Serial No. 177,157. (No model.)

section (see Fig. 2) extending through the compartment L and easing A and guided by a cylindrical bushing Q in the latter.

l\ZIOUDt6Cl upon the stem 1t, integral with the piston J and secured by the nut S, is a valve washer or gasket V. adapted to seat in wardly against bushing Q. A helical spring WV acting against the piston J tends to keep the valve V lirmly seated.

During an ordinary application of the brakes the reduction of pressure in the trainpipe is so light as to permit of equalization of pressure on the two sides of the piston through the port O without moving said piston or unseating valve V. In an emergency application, however, brought about by a sudden great .reduetion of train-pipe pressure the preponderance of pressure in reservoir K is sufficient to instantly move piston J the full extent of its travel and Furnish an additional exhaustqmssage by the valve V. The

reduction of train-pipe pressure thus brought about causes the accelerator next behind in the train to act and so on in like manner throughout the train, so that the maximum braking efl'ect is instantly transmitted throughout the length of the train.

Among the advantages of the form 01' exhaust-valve V here shown are its freedom from the numerous disadvantages of a slidevalve, its great ventage oi air for given piston travel, and. the fact that it begins to exhaust at the same instant that the piston J begins to move.

It will be also noted that by the combination and arrangement of parts here shown I am enabled to m'ovide anel'lieient, durable, and well-drained accelerating apparatus without in the slightest degree obstructing the flow of the column of air in the train-pipe.

Having thus described my invention, what I claim. and desire to secure by Letters Patent of the United States, is-- 1. An accelerator for air-brakes comprising a casing containing a suitably-drained airreservoir, a horizontally-movable piston communicating therewith and having an axial stem of star-shaped cross-section extending and exhaust-valve outlet-chamber in horizonzontally-rnovable piston therein, an exhausttal sequence, a drain-plug for said reservoir. and a drain-cup below said piston-cylinder and exhaust-valve chamber, adapted to drain the same and also serving to communicate with the triple valve and permit free passage of train-pipe air, substantially as described.

3. An accelerator for air-brakes comprising a clear passage in line with the train-pipe, a piston-chamber above said passage, a horioutlet communicating with said piston-chamber and train-pipe passage, an inwardly-seating puppet-valve for said exhaust-outlet carried by said piston, a spring tending to keep said valve normally seated, and an air-reservoir on the opposite side of the piston, sub stantially as and for the purpose described.

a. An accelerator for air-brakes comprising a clear passage in line with the train-pipe, a pistonchamber above said passage, a horizontally-movable piston therein, an exhaustoutlet fitted with an inwardly-seating puppetvalve carried by said piston, a spring normally tending to seat said valve, and an airreservoir on the opposite side of said piston, substantially as and for the purposes described. I

5. An accelerator for air-brakes having the air reservoir, piston cylinder and exhaustvalve chamber in horizontal sequence, and a drain-cup below said exhaust-valve chamber, said drain -cup affording unobstructed passage for train-pipe air and provided with an air-strainer.

In testimony whereof I have signed my name to this specification in presence of two witnesses.

VERNON o. TASKER.

lVitnesses:

W. F. Ron, A. Y. LEECH, Jr.

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