US801764A - Harrow. - Google Patents

Description

No. 801,764. 7 PATENTED OCT. 10, 1905.

M. BRENNAN.

HARROW.

APPLICATION FILED APE. 4.1905.

2 SHEETS-SHEET 1 Qtbozuma R PATENTED OCT. 10, 1905.

M. BRENNAN.

HARROW.

APPLICATION TILED APR.4.1905.

2 SHEETS-SHEET 2.

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HARROW.

' Specification of Letters Patent.

Patented Oct. 10, 1905.

Application filed April 4, 1905. Serial No. 253,838.

To all wit/Mn, it 72m concern:

Be it known that I, hlARTIN BRENNAN, a citi- Zen of the United States, residing at Garretson, in the county of Minnehaha, State of South Dakota, have invented certain new and useful Improvements in Harrows; and 1 do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

This invention relates to harrows, and more particularly to means for dumping harrows, by which is meant the operation of ridding the harrow-teeth of accumulations of vegetable growth, the object of the invention being to provide means for automatically raising and dropping the barrow-frame during the progress of the implement.

In the drawings forming a portion of this specification, and in which like numerals of reference indicate similar parts in the several views, Figure 1 is a rear elevation showing a harrow embodying the present invention. Fig. 2 is a vertical section taken longitudinally through the harrow and showing the elevating wheel and rack in elevation and in active positions. Fig. 3 is a top plan view of the harrow. Fig. A a view similar to Fig. 2 with the parts in inoperative position.

Referring now to the drawings, there is shown a harrow including a frame including the longitudinal beams 5 and (Sand transverse beams T, the several beams being provided with the usual harrow-teeth 8. The front ends of the longitudinal beams 5 and e are connected to a front transverse beam 9, to which are connected draft appliances 10 for hitching draft-animals to the harrow. Secured to the beams 5 and 6 are the forwardlydirected ends of an arch 11, which stands in a vertical plane transversely of and in the rear of the harrow-frame. From the central portion of the arch there depends a standard consisting of a plate bent upon itself to form the spaced arms 12 and 13 and the connectingbight 1a, which latter is riveted to the central portion of the arch. The arms 12 and 13 are slotted vertically, as shown at 15, and in these slots are received the ends of an axle 16, on which is fixed a ground-wheel 17. \Vith this arrangement it will be seen that the rear portion of the barrow-frame with the arch and the standard may be raised and lowered, while permitting the wheel to run upon the ground.

To raise and subsequently drop the harrowframe at times, the ground-wheel is provided with a pinion 18, which is fixed to the axle 16, so that it will rotate with the ground-wheel. Pivoted at its upper end against the upper portion of the inner face of the arm 12 of the standard is a rack-bar 19, which is held normally with its lower end swung rearwardly by means of a helical spring 20, connected to the rack-bar above its pivot and to the standard. A rock-shaft 21 is mounted in the arch and at one end is provided with a treadle 22 in position for engagement by the foot of the operator to rock the shaft in one direction. At the opposite end of the shaft is a depending arm 23, which is pivotally connected with the lower end of the rack-bar in such position that when the treadle is depressed the rackbar will be swung into engagement with the pinion that is carried by the ground-wheel. \V hen the rack-bar engages the pinion at the rear side of the latter, as illustrated, forward movement of the ground-wheel will cause the pinion to feed the rack-bar upwardly, so that the barrow-frame will be correspondingly raised, and the accumulations upon the teeth will drop from the latter. \Vhen the lowermost tooth of the rack-bar has moved from engagement with the pinion, the treadle may be released, and the spring will serve to throw the rack-bar away from the pinion, and the barrow-frame will drop to reengage its teeth with the ground. This operation may be repeated as often as may be desired to rid the teeth of the accumulated vegetation.

llhat is claimed isl. The combination with a harrow-frame provided with teeth, of a ground-wheel mounted in the frame and with respect to which the latter is vertically movable, a pinion carried by the ground-wheel, a rack-bar carried by the frame and means for throwing the rackbar into and out of engagement with the pinion.

2. The combination with a harrow-frame having teeth, said frame including an arch and a standard carried by the arch and comprising laterally-spaced arms having vertical slots,

of a ground-Wheel disposed between the arms bar into and out of engagement With the pinof the standard and having a shaft rotatably ion.

mounted in the slots of the arms and moving In testimony whereof I aflix my signature in vertically therein, a pinion carried by the presence of two Witnesses.

5 ground-Wheel, a rack-bar pivoted atits upper MARTIN BRENNAN. end to the standard and movable With its lower Witnesses:

end portion into and out of engagement with E. E. CROSS,

the pinion, and means for moving the rack- W. J. WEST.

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