US64866A - Improvement in carriage spring - Google Patents

Description

B. T. HENRY.

AM. PHUTD-LITPHLCD. N Y (DSBURNE'S PROCESS) @geiten tats uztrnt @ffice B. '.ll.v HENRY, `OF NEW HAVEN, CONNECTICUT. Letters Patent No. 64,866, dated May 21,1867.

IMPROVEMENT IN CARRIAGE SPRING.

l TO ALL WHOM IT MAY CONCERN: y i

Be it known' that I, B. T. HENRY, of New Haven, in thecounty of New Haven, and State'of Connecticut, have invented a new Improvement in Elliptic Springs for Carriages; and I do hereby declare the following, when taken inconnection with the accompanying drawings and the letters of reference marked thereon, to be a full, clear, and exact description of the same, and which said drawings constitute pa/rt of this specification, and represent, 1n-

Figure 1, a side view.

Figure 2, a top view.

Figure 3, a. longitudinal central section; and in Figure 4, a transverse central section. y

By the expression of elliptic spring I wish to he understood as comprehending a half as well as whole elliptic.

This invention is designed to avoid the great friction and wear vwhich exist in the common elliptic springs, such as are formed from severalleaves overlyingA each other, as also to produce a spring of greater elasticity -at less cost; and my invention consists in forming the plate of the spring of nearly an equal thickness, and

raising upon the surface one or more ribs, diminishing in height toward the ends; and in order to the clear understanding of my invention, as well as to enable others to construct 'the same, l will proceed to a. description thereof as illustrated in the accompanying drawings.

I prefer' te' roll the spring in a common rolling-mill, one roll of which shall be of acireumference equal at least to the length of the spring to be rolled; and in the said roll there is formed a concave groove, beginning at nothing, and gradually growing deeper to the centre, and then gradually diminishing'to nothing at the place of beginning. Through rolls thus constructed the steel is passed, which forms a flat plate, a, and the groove inA the one roll forming a rib, d, in the centre, as seen in iig. 4, the said rib diminishing in height from the centre toward either end, as seen in figs. 1 and 3, while the plate may be of nearly an equal thickness, and the rib suillcient to give the required strength to the single plate. If preferred, more than one rib may be employed; and, if preferred, a flat leaf may be placed beneath the spring thus formed; or, a leaf, having upon its under surface a cavity corresponding to the rib, may be placed upon the top for the purpose of -strengthening the spring'; yet it is better to make the rib and plate suiicently strong, so as not to require the use of other leaves. Other, and perhaps better, means than that described in the production ofthis spring may be employed; yet this plan is the best known to me.

I have described the rib as having a convex surface, as seen in fig. 4, and this I prefer, as it gives to the spring a neater and more finished appearance than would be were the rib of diferent form; yet the form of therib is no part of the invention.

Having thus fully described my invention, what I claim as new and useful, and desire to secure by Letters Patent, isv l An elliptic spring, having one or more ribs d formed upon its surface, substantially as and for the purpose set forth.

B. T. HENRY.-

Witnesses:

A. J. TIBBiTs, J. H. SHUMWAY.

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