US1129053A - Railway-carriage ventilator. - Google Patents

Description

F. H. ADDIS.

RAILWAY CARRIAGE VENTILATOR.

APPLIOATION FILED JAN. 9, 1914.

1 1;; Patented Feb. 23, 1915.

Jimmy THE NORRIS PETERS C0,, PHOTO-LITHO.. WASHINGTON, D" C,

FREDERICK HENRY ADDIS, OF .AJ'ME R, INDIA.

RAILWAY-CARRIAGE VENTILATOR.

Specification of Letters Patent.

Application filed January 9, 1914. Serial No. 811,237.

To all whom it may concern:

Be it known that I, FREDERICK HENRY Annie, a subject of the Emperor of India, residing at Ajmer, India, have invented a new and useful Improved Railway-Carriage Ventilator, of which the. following isa specificaticn.

My invention relates to an improved air extractor or exhaust ventilator of the type in which the motion of the outer atmosphere acts as a mctive force inducing a current of foul air from the interior of the space to which the ventilator is attached toward the outside.

My apparatus is especially designed for the roofs of railway cars, tramcars and the like.

In modern railway carriage design, especially of carriages for hot cars, it is found desirable to increase the air space in the in terior of the car by raising the roof as near as possible to the maximum loading gage allowable. This close approach to the maximum height however involves the drawback that it is impossible to use ordinary ventilators projecting considerably above the level of the car roof. But ventilators which dovnct exhaust the air from the top of the carriage are of little use in such constructions. It is therefore necessary that the ventilator should not exceed the height of two or three inches at the outside above the level of the car roof. It is further necessary that the ventilator should be equally efficient in either direction of motion, also that no moving parts, adjustable knobs or other mechanism requiring attention or likely when worn to become noisy, should be required to give the ventilating effect. Moreover, the air ducts and outletsmust give the maximum area possible under the circumstances without any angular bends tending to check the outflow of the air aspirated by the outer air current, and this air current must be so deflected between the car roof and the outlet of the ventilator that it can only operate as an aspirating current and not under any conditions induce or become a down draft through the ventilator.

My invention is distinguished from prior constructions of the type by the combination of these essential features. Its height above the top of the car roof need not exceed two or three inches; the aspiration is operative while the train is running in either direction and also while the train is vents. the

ders from the engine and the area of the exhaust is large, thus effecting rapid renewal of the air.

The ventilator is illustrated in the accompanylng drawings in vertical sectional elevatlons.

A represents an annular plate resting upon the roof of the railway car, B the ventilator shaft passing through the car roof into the interior thereof, C the annular curved suction funnel fixed upon the uptake B and D represents the central directing cone.

E E are bolts or stays holding the plates together. An annulus F surrounds the suction funnel C at about its junction with the uptake B and this annulus is directed downward from the center, so that its outer periphery J is nearer the plate A or the car roof than its inner periphery connected to Moreover, the closing annulus G which joins the outlet of the suction funnel to the covering plate H of the ventilator is inclined sharply downward at an angle of about 30 in like manner, so that the outlet of the suction funnel is at the apex of the inclinations of these two annuli. The plate H may be transparent or have a window H.

The material of which the ventilator is made is preferably sheet metal of suitable strength. Obviously, the ventilator may be made of any other suitable material, if thought desirable.

The operation of the apparatus is as follows :-Let us assume that the wind strikes the ventilator in the direction indicated by the arrow K. The wind impinges upon the front surface of the annulus G and is deflected downward and blows past the orifice of the annulus C producing an aspiration of the air upward through B. Even if rain, dust or the like be carried against the surface of the annulus G by the wind, there will be no tendency for the same to penetrate within the ventilator, but on the contrarv, the more powerful the air current K, the more effective will be the suction through the uptake B. Moreover, the narrowing of the distance between the annuli F and G Patented Feb. 23, 1915.

and the base plate A occurring at the orifice of the suction funnel C increases the efficiency of the draft.

\Vhat I claim is: a

In a railway car roof ventilator a vertical uptake shaft, a supporting plate on said up take shaft, an annular suction funnel of sectional area diminishing from its junction with the uptake shaft to its outlet, said funnel so curved that the direction of outflow is substantially parallel to that of infioW, a transparent covering plate, an annulus connecting the circumference of the covering plate to the outer circumference of the suction funnel orifice such annulus inclined at an angle of about 45 to the supporting plate, and an annulus connecting the outside of the suction funnel at about its junction With the uptake to the inner circumference of the suction funnel orifice said FREDERICK HENRY ADDIS.

Witnesses:

HERBERT SEF'roN J ONES, LEONARD E. HAYNES.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

Washington, D. 0.

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