USRE6037E - Improvement in car-springs - Google Patents

Description

Reissued Sept. 1,1874.

R VUSE Car-Springs- [2r vendor.-

UNITED STATES PATENT OFFICE.

RICHARD vo'sn, on

NEW YURI I, N. Y., ASSIGNOR, BY MESNE ASSIGNMENTS,

TO NATIONAL SPRING COMPANY.

. IMPROVEMENT m CAR-SPRINGS.

Specification forming part ofLetters Patent No. 51,368, dated December 5, 1865; reissue No. 6,037, dated September 1, 1874; application filed September 7, 1871.

To all whom it may concern:

Be it known that I, RICHARD VOSE, of the city, county, and State of New York, have invented a new and useful Improvement in Springs for Railway-Oars and other purposes, of which the following is a specification, reference being had to the accompanying drawin gs forming part thereof.

Figure 1 is a central sectional view, and Fig. 2 an elevation, of a spiral steel spring combined with a column of india-rubber placed within the spiral, and embodying one part of my invention. Figs. 3 and 4 are similar views of a modification of the same spring. Fig. 5 1s a top view of several spiral steel springs with rubber columns within the said steel springs, arranged in a group within a metal cap and base, designed to constitute together a single railway-car spring, the cover of the case being in this figure removed. Fig. 6 is a top view of the said group with the cap on. Fig. 7 is a central sectional view of a combined spiral and rubber spring inclosed in a single cell or case, Fig. 8 being a view of a crosssection of the same. Fig. 9 is an elevation of the same case; and Fig. 10, a top view of the same.

My invention relates, first, to the combination of two or more combined steel spiral and rubber springs grouped within a suitable cap and base, so that the group shall constitute one spring; second, to so combining a rubber center or core with an encircling metallic spiral spring, as that the rubber shall adhere and be firmly united to the coils of the metallic sprin g; third, combining with the interior of a coiled metallic spring a central column of india-rnbber that has a spiral groove on its outer surface, for the purpose of giving room within the spiral spring for the displacement or change of form of the rubber when longitudinally compressed.

In manufacturing my spring, I first form a metallic coil, A of steel in the usual manner. This spiral spring I then re-enforce, by inserting a column of rubber, B, (or its equivalent in gutta-percha,) the spiral, as seen in Figs.

1 and 3. v l

I have found by experiment and trial that the rubber and steel spiral more effectually co-operate with each other in their combined action in this spring, when they are made to adhere together, and they may be thus united either by inserting the rubber in the spiral before it is vulcanized, and then curing it by subjecting it to the requisite "heat with the coil, or the rubber may be first vulcanized and then cemented to the spiral by some suitable cement. when that is employed the temper of the steel spiral must be at the outset several degrees higher than is required in the completed spring, so that the heat applied in curing the rubber Thall not reduce the temper of the steel too When a plain, solid column of rubber is combined with the interior of a strong spiral steel spring to re-enforce it, there being no opportunity within the spiral for the displacement or change of form of the rubber when longitudinally compressed, the elasticity of the rubber is greatly restricted, and portions of the exterior surface will necessarily be forced outward between the several coils, obstructing the movements of the coils and abrading the rubber. These results are obviated and an improvement effected by molding the rubber column with a spiral groove upon its exterior surface. The groove when made should have the same pitch as the coils of the metallic spring, as shown by the drawings, and be so placed within the metallic spring that the grooves in the rubber shall coincide with the intervals between the metallic coils.

If it is desired packing between the coils, to prevent'their coming in contact with each other, a projecting fin, S, Fig. 3, may be left upon the rubber projecting centrally from in and along the spiral groove in the outer surface of the rubber column, as seen in Fig. 3, or else the spiral groove in the rubber may be formed large enough to receive the metallic coil without embracing it closely, leaving the thread separating and defining the groove in thesrubber to project=s1ightly between the coils.

The drawings represent a spring of about one-half the size I have adopted.

When a large mass of rubber is encircled I prefer the former method; but

that there shall be someby a spiral steel spring that is made of iron alone, and also when combined with wool; but or of a rod of proportionate size, or, in other I believe I am the first who ever united in the words, of a sufficient size to resist the outward same combination the advantages of the com pressure of the rubber when compressed, a linked steel spiral and interior rubber column, hard and comparatively unelastic combination and of a grouping together of a number of these is produced. Hence, when Idesire to produce combined rubber and steel springs to form one a spring of great bearing power for railway-- powerful oar-spring. cars, I group together a number of the com- What I claim, therefore, as my invention, bined rubber and spiral steel coils, about and desire to secure by Letters Patent, isdouble the size represented in the drawings, 1. A car-spring, composed of two or more having a suitable cap and base, as seen in spiral springs, in the interior of which are Figs. 5 and 6, thus forming a combination that combined columns of india-rubber,all grouped constitutes in its action a single spring of any and contained in a cap and base, substantially required power of resistance, while it has great as and for the purpose specified. elasticity and range of motion. 2'. The combinatiomwith, and in the inte- The cap and base 0 and 1), Figs. 5 and 6, rior of, a spiral metallic spring, of a column of are made of cast-iron to receive a number of rubber that is spirally grooved on the outside, my combined rubber andvspiral steel springs, substantially as and for the purpose specified. and retain them in position, so that they will 3. The combination, with, and in the intenot come in contact with eachother while rior of, a spiral metallic spring, of a column of they have freedom of vertical motion. rubber, the rubber and metal cemented to- I am aware that springs have been made in gether, substantially as and for the purpose which'a solid column of india-rubber has been specified.

' RIOHD. VOSE.

combined with the interior of a steel spiral spring. I am also aware that railway-car Witnesses: springs have been made by grouping together I. P. FITCH, a number of small-sized spiral steel springs JAs. GILLET.

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