US22941A - Spring - Google Patents

Description

A. B.'DAV|S.

Car Spring. N0. 22,941. Pamed Feb. 15, 1859.

Witnesses: Inventor I lMtFHTQ-LITHD, CD, N.Y. (USBURNE'S PRDCESS.) v

sra'rns natuur oriana.

AUGUSTUS" n. navrsf orl Pi-IiuADELrHiA, rENNsi/"Lvaxia:

RAILROAUCAR SPRING.-

Speccation forming part of LettersPatent No. 22,941, datetlFeb'ruary15,1859; Ressied'Janu ary`f6,=1863, Nos.

To all whom it may concern:

Be it known that I, AUGUSTUS B. DAVIS, ofy

by means of a bolt or bolts, the said box containing a number of spiral springs confined vertically between the bottom of the box and the lid, and retained in their proper position laterally by means of lugs or other suitable devices, the said lid having a limited ver tical but no lateral movement independent of the box, and the Whole forming a new manufacture; namely, a railroad car-spring, easy in its action, portable, selcontained and readily adapted to its place in the car.

In order to enable others to make and use my invention, I will noW proceed to describe its construction and operation.

On reference to the accompanying drawing, Which forms a part of this specification; Figure 1, is a sectional elevation of my improved manufacture of railroad car spring. Fig. 2, a sectional plan on the line l, 2 (Fig. l).

A is a metal casing, the precise form of which is not material, although I prefer making it square or oblong, as these forms admit of its containing the greatest number of springs in proportion to its size. The case is closed at one end and open at the other, for the admission of a series of spiral springs B. A plate C tits, so as to move freely, into the open end of the casing, and, betiveen the opposite end of the latter and the plate, the spiral springs are coniined longitudinally, While they are retained in their proper lateral positions, and prevented from crowding on each other, by projections a both in the casing and on the inside of the plate. A bolt D' passes through both the casing and the plate, and is furnished at one end With a head al, which, fitting into the beam which rests on or against the casing, serves to maintain the latter in its proper position.

It is desirable that the spiral springs, in

order` that they may retain their efcient elasticity, should never be compressed beyond a certain limit.

The compression of the springs, in my improvement, is limited by the projection c on the plate C, which comes in contact with the end of the box, before the springs have been compressed to a deteriorating extent; the expansion of the springs being limited, by the extent to which the plate C is caused to project into the casing, by the nut e on the end of the bolt.

The spiral springs may be made of steel Wire, although I have found the best and most tenacious iron Wire equally serviceable, if treated properly, and much more economical than steel.

In making experiments, With a view of rendering iron Wire serviceable as spiral springs, I have found that, after the Wire has been coiled, the coil cut to the desired length and subsequently compressed to the extent to Which it has to be limited hereafter, the spring Will not, on the removal of the pressure, resume its former length, but, on subsequent pressures being applied, provided they do not exceed the limits of the first, the spring Will invariably recoil to the extent to Which it expanded, after the Ie moval of the iirst pressure. Hence the `advantage of the above described arrangement for limiting the compression of the springs, enabling' me to use in their construction a cheap and easily Worked materiali. It is also desirable, in order that the springs may retain their efficiency, that they should not be strained laterally. This tendency is obviated, in my improvement, by the plate C fitting into and retaining its proper relative position with the casing laterally, and by the additional precautionary measure, of

employing the projections a to maintain the springs in their proper position, with respect to the casing.

Springs constructed as above, are much more durable, and much more easy in their action, than when a single spiral spring only is used. At the same time they are cheap, portable, and readily adapted to their places.

The casing or box A is inverted, as shown in Fig. l, in order that it may afford a lodgment forvvater and dirt.

I Wish it to be distinctly understood, that I lay no claim to any separate specific part or any particular device, connected With the above described spring, but I claim- As a new and useful article of manufacture and merchandise, the entire railroad car spring herein described, that is to say, a spring composed of a box or casing having a plate or lid connected and adapted to the same, the said box containing a number of spiral springs confined between and limited 10 in their movement by the said box and the lid, and retained in their proper position laterally by lugs or equivalent devices, as herein set forth.

In testimony whereof, I have signed my name to this specification in the presence of 15 two subscribing Witnesses.

A. B. DAVIS.

Witnesses:

HENRY HoWsoN, HENRY ODIoME.

[FIRST rmNrnD 1911.]

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