US200610A - Improvement in gar-sprin gs - Google Patents

Description

INER. Car-spring Patented Feb. 26, 1878.

55%; jWW Zar UNI'IED STA'I'ESS PATENT OFFICE.

I IEMAN GARDINE'R, OF NEW YORK, N. Yj.

1 M P-ROVEM E NT N o R- s pnm es.

Specification formin g piiri: of Letters Patent N o. 200,610, dated February 2( 3, 18'7 8 appiication fi1eri T0 all whom z't may concem:

Be it known that I, HEMAN GARDINER, of the oity, county, and State of New York,ha.ve invented new and nsefu1 Improvemehts in Springs suitaiole for Railroad-Oars and. other uses, of whioh the following is a, speoifioation:

My invention has referenee 110 that dass of springs composed. of stee1 spiralooils and rubber, aoting as an auxiliary or cushion to the spirals; and my invention oonsists, first, in the peonliar oonstruotion of the parts which, when put together, form ishe exterior spira1 eoil of the spring; seoondly, in ehe peculiar f0rni and arrangement of the rubber cus hions whioh operate as auxiliary to the spirais; and,

- thirdly, in the combination of the parts as a who1e, with reference especially to forn1ing a milroad-car spring.

In the accompzvnying drawings, Figure 1 represents a side elevation of my spring; Fig. 2, a vertioal oross-seotion through the center of the sarne; Fig. 3, aplan view of one of the india-rubber rings which are used in combination With the steel spirzul.

In all the figures similar letters represent similar parts.

The exterior spiral ooi1 of my spring is coustruoted. in the following manner: I take two strips of steel, suitabie 110 the size and strength 0f the spring required, and of such length as, when coiled, to forrn a spring of the required height. These strips are roiled out so as to correspond in size and shape 130 eaoh other externally and internally, and so that When the two are put together they oonstitute the body of the exterior spiral spring. The forma of these strips, when rolled and when put together, is shown in the oross-seotions of the spiral in Fig. 2, a a being the two parts, having 011 their interior faoes semioiroular grooves, corresponding to eaoh other, anci whioh, when the two are put together, form the oiroular groove b, extending the length of the coils. The interior faoes'of these'strips are beveled ab the upper and lower edges in the ro1ling, as shown ab c, Fig. 2. This beveling is for the purpose of attaining as mach lightness and saving in the material as may be consistent with unimpaired strength.

Within the ciroular groove b I plaee a circu]ar steel rod, of corresponding size With the groove, am]. which rnns the length of the steel through all the ooi1s. 113 fills the space b, and may be represented. in the drawing by that space.

Before the coiling operation is performed, the strips a a and. rod b are plaoed together, anci t he ends of a a are heated and welded together, so as 150 fix the ends firm1y to eaoh other, between Which, ab the ends of the rod,-

which are seoured and hold within by the weiding of these ends to a a, so that the rod.

operates by extension 0r dontraotion, and is, in faot, a tensive as well as elastie rod. The parts thus prepared are then eoiled. into the spiral spring, as shown ab a in Fig. l, on the exterior face, and in Fig. 2, at a b 0c, as to the interior forn1. The ends 0f the spiral 2blld of the rod are brougho to a fiat surfaoe, so that the top am]. bottoin of the spring will be paralle1 and perpendieular to the axis of the spring.

The rubber porbion 0f the spring is composed of a series of similar rings, d. (Shown in p1an in Fig. 3 and in oross-seotions in Fig. 2, and in elevation in tl1e partly-dottod 1ines in Fig. l.) These rings d are placed one uponanother, and are of such dimensions as 1:0 fit closeiy within the oore of the spiral, und be hold there by the pressure. They are in number equal to "ehe number of ooils, 'a-nd the ir thickness should about equ2u1 the width of the spiral bar. The outer surfaces of the two upper and lower rings should be flush with the t0p and. bottom of the end coils of the spiral a.

Within the rings is inserted the small sceei spira1 spring e, extending the 1ength of the spring, and the eore of whioh may be paoked with fe1t or cotton, 0r other material suioable for a.otin g as a cnshion.

(Ehe peouliar oonstruotion of the exterior spiral, as described, secures the advantages of being easily rolled, with diminished liability to straining in the coiling it is more easily sind unifoirrnly tempered throughout; anc1 it is ]ighter in material, as compared wibh springs made solid of similar power. The rubber portion of the spring, being divided into soctions, as desoribed, and of the ring form, not on1y affords spaoe for the bulging of the rubber under pressure, but the rings are very easily and cheaply construeted, and. can be repaired with facility and cheapness by simply substituting a fresh ring for one that may have become inj ured.

The spring, as a whole, possesses all required elastieity and ease of action, and also great sta'rength and security against fi*acture 01 injury from the strain am]. shocks which railroadcar springs are subjected t0.

Having thus described my improved spring and. the manner of cons tructing the same, what I claim therein as my invention, and desire 130 secure by Letters Patent, is

l. The exterior spirallycoiled compound steel spring, composed 0f ehe parts a a b, welded together at their ends, anal the ends of HEMAN GARDINER.

Witnesses FRANK E. MORGAN, AUDLEY J MOONEY.

Images