US179097A - Improvement in car-springs - Google Patents

Description

E. CLIFF.

CAR-SPRING. No.-179,097. 7 I Patented. June 27, 1876.

I v I i UNITED STATES PATENT CFFICE.

EDWARD CLIFF, OF NEW YORK, N. Y.

IMPROVEMENT IN CAR-SPRINGS.

. Specification forming part of Letters Patent Nol79,097, dated J une 27, 1876; application filed September 21, 1875.

To all whom it may concern:

Be it known that I, EDWARD CLIFF, of the city, county, and State of New York, have invented a new and useful Improvement in Spiral Metal Springs, of which the following is a specification, reference being had to the accompanying drawings, forming part of the same, in which Figure l is a perspective View of a spring containing my new improvements, and Fig. 2

is a central vertical section of the same. Fig. 3 is a cross-section of the bar of metal of which the spring is formed.

My in vention relates to spiral metal springs and consists in the peculiar form of the bar of which these springs are made, which form is clearly shown in the accompanying drawin gs and described herein, whereby great bearing power for the weight of the metal used is secured, and a spring is made to combine the advantages of both the volute and the plain spiral in one.

The bar of metal of which my new spring is formed may, in fact, be regarded as consisting of two bars, being substantially of rectangular or oblong form in cross-section, united at their respective corners, as shown in Fig. 3. Such bar may be made by taking a fiat bar of proper dimensions and setting one half or portion off from the other, which may be done in suitably constructed rolls. The bar thus made to form a spring is coiled into a spring on a suitable mandrel, in the usual way, as shown in Figs. 1 and 2, the lower ofl'set portion of the bar ranging within the upper offset portion.

In a spring thus formed, when fully compressed, the under edges (1 of the lower offset b rests on the ledge 0, formed in the bar at the point of offset, effectually preventing fracture of the spring; but the chief advantage is the great bearing power imparted to the spring by the peculiar form of the bar.

Any number of these springs may be arranged one within another to form a nest.

What I claim is A spiral metal spring, made of a bar, having the peculiar form shown and described, so that the inner shoulder of the bar in each coil may bottom squarely on the outer shoulder of the bar of the next lower coil.

In witness whereof I have hereto set my hand this 20th day of September, 1875.

.EDWARD CLIFF.

Witnesses:

B. S. CLARK, FRED. E. BOND.

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