US71317A - Improved car-spring - Google Patents

Description

EN U {nvanfnr W Geo W. mrmminn;

' use?! to Self and R.'1 e11ey TO ALL WHOM IT MAY CONCERN:

Be it known that I, GEORGE W. McMINN, of Cincinnati, Hamilton county, State of Ohio, have invented Quinn istes ilatent- @ffirt.

GEORGE W. McMlNN, OF CINCINNATI, OHIO, ASSIGNOR TO HIMSELF AND.

ROBERT T. REILEY, OF SAME PLACE.

Letters Patent No. 71,317, dated November 26. 1867.

IMPROVED GAR-SPRING.

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a certain new and useful Improvement in Car-Springs; and I dohcreby declare the following to be a full, clear, and exact description thereof, reference being had to the accompanying drawings, making part ofthis specification.

My invention consists in such construction of steel springs for cars ar.d other vehicles, that lcssmctal is required to produce a spring of a given power than by any other form of construction in use. In the accent:

panying drawings--' Figure 1 is a perspective view UL a car-spring embodying my improvements.

Figure 2 is a detached view of one of the double or folded leaves.

The spring is composed, as shown, of two double or folded leaves or members, A B, the metal in each, as shown in figfZ, being folded at or near its mid-length, to form the eye A or B, the leaves a b a 6 serving,

each for a layer of the spring, making four layers in all. Tents, 0, prevent displacement in the customary stirrups or bolsters. The folded leaves are shipped into place to form the complete spring, asshown in fig. 1;

none of the'customary bands or strips being required to unite the leaves together. The inner edges of each plate are curved into the form of lips, d d, which, lOCkingWithin the eye of the other member, become efl'ectual to hold the parts securely together, without the aidof straps or bands, which, in the customary forms, add

greatly to the weight of the spring. The end eyes or. loops A B are found to he of the most signal utility,

adding largely tothe resilient force of the spring, with very slight increase of the weight thereof. The said loops are also effective, in conjunction with the end lips (I d, to lock the two members of the spring firmly together. I have found by actual experiments, that while a set of four truck-springs, constructed in the best form hitherto used, will weigh from nine hundred to one thousand pounds, a set formed on my plan, as herein described, will weigh but one hundred and eighty pounds, the springs being equal in power and efiiciency.

I claim herein as new, and of my invention 1 Forming a spring of two plates of metal, each of which is folded to make two'layers of the spring, and

shaped at or near its mid-length and inner end respectively to form the end eyes or loops A B, and lips 01 d i of the spring, as described. and for the purposes explained.

In testimony of which invention I hereunto set my hand.

GEORGE W. MeMINN.

Witnesses:

Gno. H. KNIGHT, JAMES H. LAYMAN.

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