US469192A - Patrick e - Google Patents

Description

(No M0961.) f

P. R. WALSH.

BICYCLE SEAT SPRING. l No. 469,192. Patented Feb.'16,'1892.

UNITED v STATES PATRICK R. WALSH, OF ROCHESTER, NEV YORK, ASSIGNOR OF ONE-HALE PATENT OFFICE.

TO MARY CAMPBELL, OE SAME PLACE. i

BICYCLE-SEAT SPRING.

SPECIFICATION forming part of Letters Patent No. 469,192, dated February 16, 1892. Application led October 12, 1891. v Serial-No. 408,494. (No model.)

.T0 @ZZ wwm it may con/cern:

Be it known that I, PATRICK R. WALSH, of Rochester, in the county of Monroe and State of New York, have invented a new and useful Improvement in Bicycle-Seat Springs, which improvement is fully set forth in the following specification and shown in the accompanying drawings.

My invention relates to the class of springs for bicycle saddles or seat-s in which the springs are made of round steel rods, bent so as to form a yielding support for the seat, the invention being hereinafter fully described and particularly pointed out in the claims.

Referring to the drawings, Figure l is a side elevation of my improved spring, and Fig. 2 a view of the same seen as indicated by arrow in Fig. 1.

The spring I usually make of spring-steel rod, round or polygonal in cross-section, onehalf inch in diameter, and bend it substantially as shown in the drawings. It is made, preferably, with a complete turn or'coil a, and successive spring bends b in its upper branch or member e, and o d in the lower branch f.

k is a tang or shank to enter the socket Z of the bicycle, to be held in the usual man-- turn shorter than the radius i of the bend as they recede from the shank la to the eX- treme overhanging bend or coil a. Likewise the radius n of the bend b, between the bend a and the stem s, is greater than the radius g.

It is understood that in a spring, other things being equal, the shorter the radius of a bend the stiffer is the bend, and in a spring of the nature of the one here shown the material of the spring at the bend a is subj ected to greater stress of lieXure when supporting the weight of the rider than the parts at c and d, and also the part at b; and in constructing this spring I have distributed the spring-bends, considered as to their relative stiffness, with reference to the points subjected to the different degrees of stress. That is to say, the stiffest bend is placed at the point' of greatest stress, the limberestl bend at the point of least stress, and the intermediate bend at lthe point in the spring where the medium stress falls.

The bends at o and fr are formed to give to the shank and stem s, respectively, their proper directions, one substantially vertical and the other substantially horizontal, and are not designed especially as spring-bends. By this construction of the spring I render available for spring purposes all of the material from o to r, thus getting much spring with a comparatively short piece of steel rod and within little weight and in small space.

The bends b and c are preferably made of the same radius and formed so as to quite clearly approach each other as to vertical distance; but these bends are laterally offset from each other to occupy different vertical planes, on account of which there is no danger of their colliding when from an unusual ca'use-as, for instance, from the wheel suddenly rolling upon or over somelarge body in its Way-the spring is caused to yield momentarily in excess under the unusual stress brought to bear upon it.

Vhat I claim as my invention is- 1. A bicycle-saddle spring formed of round or polygonal rod, having an extreme coil or bend a and spring-bends c, d, and b near the coil, with shank and stem, substantially as shown.

2. A spring for the saddle of a bicycle, formed Wit-h spring-bends d, c, and a, shank k, and stem s, the radii of said spring-bends decreasing in length from the shank outward, substantially as and for the purpose set forth.

3. A bicyclesaddle spring formed with spring-bends d, c, and a, with shank la and stem s, and a spring-bend b between the bend a and the stem, said bend b having a radius greater than the radius of the bend a, substantially as described.

4. A bicycle-saddle spring formed with a spring bend or coil a and a bend b in its up- -per branch and a bend c in its lower branch,

said bends b and c being made substantially In Witness whereof I have hereunto set my hand, this 28th day of September, 1891, in the presence of two subscribing Witnesses.

PATRICK R. WALSH.

5 toward and near each other and laterally off- Vlitnesses:

set in different vertical planes, substantially ENOS B. VVHITMORE, as shown and described M. L. MCDERMOTT.

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