US66702A - Robert gray - Google Patents

Description

@uitrit tetra @anni @ffice ROBERT-GRAY, or LITGIIFIELD, ILLINOIS.

' Leners Parma N, 56,702, dared July i6, 1867,

IMPROVEMENT IN ELLIPTIG SPRINGS..

TO ALL WHOM IT MAY GONGERN:

Bc 1`t`known `that I, ROBERT GRAY, of Litchfield, in the county of Montgomery, and State of' Illinois, have invented a new and useful Improvement in Corrugated or RibbedSprings and I do hereby declare that the following is al full and clearl description thereof, reference being had to the accompanying drawings, and' to the letters of reference marked thereon.

This invention consists lforming each of the leaves of a spring 1nto a longitudinal corrugation, thc said corrugations being so arranged and itted together in the different leaves as to greatly strengthen the spring, and

at the same time to increase its elasticity. The shape of the corrugations, as represented on the faces ot the spring leaves, will ben'early or quite parabolic, with convex contour at the ends of' said corrugations. The.

general form of the corrugations, in elevation, is such that the varying lengths of leaves which go to 4make up the spring will fit nicely together, that is, a long one upon a short one, and vz'ec versa.

To enable those skilled in the art to make and use my improved spring, I will proceed to describe its con struction and operation. v 4

Figure l of the drawings is a side elevation of onc of the improved springs, the dott-ed lines showing corrugation of one leaf entering the thickness or" another.

Figure 2 is a side elevation of one leaf.

Figure 3 is a plan of one leaf.

Figure 4 is a transverse section bisecting one leaf.

This spring may beelliptical in its formation, or it may be a semi-ellipse, as is represented the spring A in the drawings. This latter variety is the more common for locomotives and other similar heavy purposes. The spring A is made up of a number of leaves a in the same manner as springs now in use. In each of these leaves there is a corrugation or longitudinal rib a', projecting outwardly from' the convex side of the leaf, and nearly its entire length: These corrugations or ribs; are to be pressed or rolled out of the solid. melalof which the leaf is formedfand in such a manner as to make the width and projection ofthe rib much larger and stiffer ii the centrellongitudinall'y) of the leaf than toward the ends. This arrangement forms the horizontal projection of the base ofthe rib, vnearly or quite in a parabolic curve, as seen clearly'ing. v3. At thc ends of the ribs a', where the two parabolic curves meet, they should be connected by an easy curve, as is also shown in Iig. 3. The ribs should not extend the whole length of the leaf', but stop short of the hanger-seat of thc long elliptical curve, as shown in fig. 3, and substantially for the purpose set forth. v

leaves, but approach more nearly to thccnds of the shorter ones. The lwhole con-struction should be such that the convex side of one rib vwill fit into the concave side of another.A The widening ofthe rib-in its centre gives it a corresponding increase or" depth and. consequently of strength at that point, and from the centre of each spring thus constructed to its ends there isnn increasing elasticity. Springs may be constructed in this manner much more cheaply, both as regards material used and labor required for thcmanufncture, and the springs so constructed will also bc'much more clasticand also more du'rahle. A band, B, may be used, ns formerly, to connect thc different leaves together 4into the form of a spring.

Having Vdescribed my invention, what I claim is l T Projccting a rib, a', from the convex side of a lent` of tlie'spring, so as to form a rounded parabolic curve or ROBERT GRAY.

Witnesses H. C. WATSON, J'. H. FILEER.

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