US309800A

US309800A - Harrow

Info

Publication number: US309800A
Authority: US
Publication date: 1884-12-23
Anticipated expiration: 1901-12-23

Description

(No Model.)

' P. RANDALL;

HARROW.

Patented Dec; 23, 1884..

171 yen z o 21 M lness es This feature is not here shown.

UN TED TATES ATENT Crricn.

FRANCIS \V. RANDALL, OF TEKONSHA, ASSIGNOR TO NEHEMIAH CHASE, FRED R. TAYLOR, MARSHALL B. SHAW, AND FRANK J. HENRY, OF

KALAMAZOO, MICHIGAN.

HARROW.

SPECIFICATION forming part of Letters Patent No. 309,800, dated December 23, 1884-.

(No model.)

T 0 (ZZZ whom it may concern.-

Be it known that I, FRANCIS W.-RAN1).ILL, a citizen of the United States, residing at Tekonsha, State of Michigan, have invented a new and useful Harrow, of which the follow ing is a specification.

This invention has for its object certain llllprovements in that class of harrows in which the teeth or shares are combined with shareactuating springs. Y

In the drawings forming a part of this specification, Figure 1 is a side elevation of a tooth, tooth-holder. and spring. Fig. 2 isa side elevation in which the tooth is broken away, showing a change in the tOOlZl'l-llOlClQl, Fig. 3, a broken view of the spring in en larged perspective. Figs. 4. and 5 are details in enlarged perspective, and Fig. 6 is a horizontal broken section intercepting the bolt a, said bolt being left full.

The coil-spring B is secured in a seat on the upper side of the beam A, the inner end of the coil being located above said point of securing, and the outer end of the coil in the roar of the coil.

1) is a tooth-holder having a central opening, Fig. 4, through which the coil passes in its upward curve after leaving'its seat. The inner end of the coil is secured to the forward end of the tooth-holder D at c. The tooth P is bolted to the other end of the holder D by bolt a. The outer end of the coil is bolted to an upward extension, 0, of the tooth-holder, or it may be extended and secured by the same bolt, a, which secures the tooth, Fig. 1.

On the under side of the rear end of the tooth-holder D is a concavity, 71, into which the tooth is forced by tightening the bolt a, to form a secure connection. The disconnected portion of the tooth is designed to be made non-elastic by striking it in from the rear side. The spring, where it is secured in its seat, is provided with a nipple, a, Fig. 3, and the convex side of the clip 26 has a series of concave recesses,

1', into which the nipple a enters to form a secure and adjustable connection. By means of this simple construction a better spring action is secured, and henceless danger of breaking the spring, and less spring metal is.required to attain the desired result. It will be observed that a backward strain upon the tooth. acts upon the entire disconnected portion of the spring, and that said action coils the inner portion of the spring and uncoils the outer portion. The inner portion of the spring, being stiffer than the outer portion, does not unduly yield under the strain of the draft-power in drawing the harrow forward, and yet yields suffieiently in conjunction with the freer action of the outer end to impart to the tooth a proper vertical play.

I am aware that prior to' my invention curved springs and tooth-holders of different styles have been connected together, and the holders connected with barrow-teeth in a manner to produce elastic effects in the soil and different actions of the springs; but, so far as I. know, I am the first to construct and com bine a spring, tooth-holder, and tooth in a manner to effect the .results produced by my invention, as hereinbefore described.

' Having thus described my invention, whatI claim as new is In a harrow, the combination of the tooth, circularly-coiled spring, and the tooth-holder described, the latter having its forward end beyond its central opening secured to the inner end of the coil, and its rear end secured to the other end of the coil and to the harrowtooth, whereby the movement of the tooth acts upon the spring, in the manner set forth.

In testimony of the foregoing I have hereunto subscribed my name in the presence of two witnesses.

FRANCIS w. RANDALL.

Witnesses:

G. O. THOMPSON, G120. D. B. HALL.