US8105A

US8105A - Leyi bissell

Info

Publication number: US8105A
Authority: US
Publication date: 1851-05-20
Anticipated expiration: 1868-05-20

Description

` drawing, making a'part ofthis specifica- NUNITED sTATEs PATENT oEEicE.

LEVI BISSELL, OF NEW YORK, N. Y.

Y CARRIAGE-SPRING'.

Specification of Letters Patent No. 8,105, dated May 20, 18511.

following is a full',clear, and exact descrip- .tion ofthe construction and operation of the same, reference beinghad to the annexed tion, in whichi Figure l, is an edge view in the form of a common elliptic spring; Fig. 2, represents what may be called an inverted d elliptic spring; Fig. 3, is a different forni to which my mode of construction is adapted; Fig. (l,

is a view of the convex side of an elliptic spring,Y and Fig. (5, is a spring of a somewhat diierent constructionLwhere the same principle is contained. i

I propose tomakemy spring ofvwood using for the purpose good ,strong and seasoned hickory, oak, ash, or other strong wood; the springis dressed to a proper size and'of such a taper. as when pressed upon,V

bends equally in its whole length.` I then cut saw kei-fs (see a, a, &c.) square across the spring at about two inchesapart (more or less) ,cutting suchkerfs about two thirds (more` or less) through the spring; these saw kerfs are filled in with strips of metal, wood, or other hard substances, if for a rigid, and with elastic substances, for a more elastic spring; which are forced in sufficiently tight to bring the springto a proper curve, or compass desired, in the unstra-ined spring. To prevent the parts of the spring between the strips from parting from the saine, I put a rivet (see Z), I), &c.) through each of them as represented in Figs. 4 and 5, and to prevent the strips from `dropping out, if by any means they should become loose I let a corner of the bur on the ends of the rivet, extend a little over the strips. I

When the spring is required to sustain a very heavy pressure, it may be necessary to strengthen it by a plate of steel or other metal to run the Whole length of the spring,

to be securely riveted on the concave side of the spring as represented in Fig. 2.

The spring represented at Fig. 5, consists of a plate/oit' steel or of other metal, set to the proper curve, on which is rinly riveted or bolted a succession of blocks of hard wood, or other hard substance, the vblocks being so fitted to each other Aas to form close joints as represented at Fig. 5, orsuch blocks may be iitted so as to leave spaces toV be filled with either hard or elastic substance as represented at Fig. 4.

It will be perceived, by reference to the foregoing description and drawings, that when force is applied to the spring, it will tend to ,close such kerfs, which will produce a strong pressure on the strips with which the kei-fs are filled, such strips acting as braces to each other at that side o the spring, causing a lengthwise tension at the opposite side of the spring, and if made of wood, will be in the direction of the fiber, and that nothing sho-rt of a. force sufticient to pull apart the liber in a lengthwise tension, can cause it to give away. It will be seen also, that rigidity or elasticity may be stance iilling the kerf, more or less, the same spring may be adapted to any given load, or purpose.

Vhat I claim as new and desire to secure by Letters Patent is- The construction of springs, whether of wood, or part wood and part metal, or other elastic or nonelastic substances, as adapted and applicable to carriage springs, and springs for `other purposes, in the manner substantially as herein described.

LEVI BISSELL. In the presence of- I. S. SMITH, E. G. HANDY.