USRE4464E - Improvement in rotary harrow-teeth - Google Patents

Description

UNITED STATES PATENT OFFICE.

JOHN F. CHASE, OF VVESTBROOK, MAINE.

IMPROVEMENT IN RTARV HARROW-TEETH.

Specication forming part of Letters Patent No. 113,141, dated March 28, 1871 3 reissue No. 4,464, dated July 11, 1871.

a cross-section of a tooth, B, its journal, and the bearing-box before referred to, and the part of the frame into which the pivot is iixed. The pivot can be secured in a variety of well-known ways, or by a pin, as shown in Fig. 3, the saine passing' through the upper end of said pivot. The edges of the base a maybe made sharp between the prongs, so as to render the tooth less likely to beconie, in use, clogged by roots or stones. The triangular forin of the prongs enables thein to slip readily by opposing' stones or roots while the harrow is in operation. This harrow operates differently from coinnion rotary harrows with a nlunber of teeth set into a rotary frame pivoted to a inain frame of a harrow. This results from the triangular shape ofthe base a and the teeth at each angle of the saine.

I do not claiin a rotary harrow as constructed with teeth set in 011e or more rotary frames applied to a body or frame.

What I do claim, and desire to secure by Letters Patent, is

As a new manufacture, a rotary tooth for a harrow, said tooth being composed of the prongs b, and the baseaf, arranged and formed in one piece of inetal provided with a central pivot or bearing.

Portland, April 2-1, 1871.

JOHN F. CHASE.

To all whom t may concern:

Be it known that I, JOHN F. CHASE, of Westbrook, in the county of Cumberland and State of Maine, have invented a new and useful I1nproveinent in Rotary Harrows 5 and I hereby declare the following' to be a full, clear, and exact description of the saine, reference being had to the accoinl'ianying drawing forming part of this specification, in which- Figure 1 denotes an under-side view; Fig. 2, a side elevation of a harrow provided with threepronged rotary teeth, in accordance with inyinvention.

Same letters show like parts.

The inain body or frame of the harrouf', as herein represented, is a triangular frame 5 but this particular forni is not necessary to the operation of the part to which iny invention relates. A shows the frame. Each tooth B is pivoted to the frame, and the several teeth are arranged relatively to the frame in the manner represented in each tooth. Each of said teeth is composed of a base, .0, and three prongs, b b b, inade or cast in .one piece of metal. At the center of its upper side each plate or base a is fiunished with a pivot, c, to enter the frame A upon this the plate revolves as the harrow is drawn over the eld. The pivot c may enter and revolve in, if desired, a bearing or box, d, fitted into the frame A. Each prong is triangular in its horizontal section, and, being connected with the base or plate a, descends vertically from. the sanie. Fig. 3 shows W'itnesses:

WM. HENRY CLIFFORD, GEORGE E. BIR

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