US252535A - spears - Google Patents

Description

(No Model.) v

E. SPEARS.

DOUBLE TREE. .No. 252,535. Patented Jan. 17,1882;

.5: v entai N. PETERS Phulo-Lunomulw, Wauhinxlnn, D. c.

NITEI) STATES PATENT OFFICE.

EMANUEL SPEARS, OF LA FAYETTE, INDIANA, ASSIGNOR TO HARDING, BARBEE & (30., OF SAME PLACE.

DOUBLE-TRE E.

SPECIFICATION forming part of Letters Patent No. 252,535, dated January 17, 1882.

Application filed October 4,1881. (No model.)

State of Indiana, have invented a new and useful Improvement in Double-Trees; andI do hereby declare that the following is a full and accurate description of the same.

Double-trees are usually provided with a cheek-chain at each end, extending back to the axle, for the purpose of limiting the movement of the double-tree. They have also been frequently provided with elastic connections to the tongue or axle to relieve shock and jerking in starting, or when obstructions are encountered by the wheel. Neither of these, however, is my invention, not capable of accomplishing the purpose of it.

It is desirable that the double-tree shall, as nearly as possible, be maintained in a position at right angles to the tongue, and I have therefore provided an elastic brace or buffer, which will resist a motion of the double-tree .in either direction from the position at right angles to the tongueor line of draft, and without preventing said motion under stress will constantly tend to restore the double tree to its proper initial position.

My invention therefore consists in an elastic brace or buffer applied to a wagon doubletree to resist any motion of the same away from a position at right angles to the tongue or line of draft.

That others may fully understand myinvention', I will more particularly describe it, having reference to the accompanying drawings wherein- Figure 1 is a plan view of a typical form of my device. Figs. 2, 3, 4., 5, 6, and 7 represent detailsjof modifications.

A is the tongue. B is the double-tree. G G are the \vhit'tletrees, all attached as usual and pivoted to the tongue by the hammer-strap and bolt, as usual. In this case, however, I provide a block of rubber, D, which is straight along one edge to bear against the doubletree,and placezthe same in contact with the double-tree, either before or behind it, but

preferably before it, because then it the double-tree is loose on the hammer-bolt the draftstrain will be partly borne by the block D, and said block will always be kept in the most effective operative position. The block D may be secured in place by some convenient means. In the drawings I represent the hammer-strap as being extended forward a distance sufficient to inelose said block, but it may be secured in any other convenient way. The elastic pressure of said block against the doubletree on each side of its pivot tends to keep said double-tree always in a position which willmaintain said pressure in equilibrium. A forward movement of the double-tree at either end will increase the pressure on one side and relieve it on the other, and the tendency will be to restore the double-tree to its normal position.

Figs. 2 to 7 represent various modifications of my invention, consisting of different ways of I arranging the elastic brace or 'buffer without departing from the principle of the invention.

In Fig. 2 the elastic brace or buffer consists of two elastic pads, D, arranged on a bolt, I), transverse to the tongue, and a rigid arm, d, secured to the double-tree B, and having its outer end confined between the pads D D. Any movement of the double-tree upon the hammer-bolt will causethe compression and resistance of one or the other of said pads.

In Fig. 3 a single elastic pad, D is placed on a bolt, 1), longitudinal as to the tongue, said bolt being capable of motion longitudinally to compress said pad against the clip 0, and the end of the bolt 1) is attached to the double-tree at such side of the hammer-bolt by flexible connections g g, whereby a movement in either direction of the double tree on the hammer-strap will cause one or the other of the connections gg to be drawn forwardand the pad to be compressed.

Having described my invention, what I claim as new isy 1. The tongue A, and double-tree B, pivoted to said tongue, combined with the elastic brace or buffer mounted upon said tongue,

and supported in engagement with the doube resisted by said buffer, for the purpose set ble-tree to hold the same in position, as set forth.

forth. his

2. A double-tree pivoted to the tongue, com- EMANUEL x SPEARS. 5 bined with an elastic brace or buffer in enmarkgagement with said double-tree ateach side Attest: of said pivot, whereby any motion of said J. U. DAVIDSON, double-tree upon said pivot will compress and THOS. HARDING.

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