US501A - Improvement in plows - Google Patents

Description

UNITED STATES ,PATENT OFFICE.

STEPHEN MecoEMIcK, 0F AUBURN, VIRGINIA.

IM PROVEM ENT IN FLOWS.`

Specification forming part of Letters Patent No. 501, dated December 1, 1837.

To all whom it may concern:

Be it known that I, STEPHEN MGCORMICX, ofAuburn, in the county ofFauquier and State of Virginia, have made certain improvements in the plow for which I originally obtained Letters Patent of the United States dated the from A to B is eighteen inches, or nearly so.I

The landside and mold-board I have cast in one entire piece, as is frequently done in other plows. The share may be of wrought or ofcast iron. Upon the lower side of the landside there is a rabbet or recess to receive the hind end of the share, when of wrought-iron, which is to be Screw-bolted to and iiush with it. This recess may be two inches in height. Its line of junction at the back end is shown at a a. On the lower'side of the landside, at its back end, I also generally form a recess or rabbet. the place of which is shown by the lines a t B, to receive a shoe,which is to be bolted on. Som etimes, however, I omit the shoe and leave the casting solid, and in the form shown in the drawings. From the back end of the moldboard, as at b, at the distance of about tive inches from B, its bottom line rises in a gentle curve, but as it approaches the heel the curve is quicker, and the heel assumes a semicircular form, as shown in its outline at B, which semicircle is upon a radius of about two inches. This curvature in a landside ofthe designated length gives a proper leverage to the handles, While it suffices to steady the plow, keep it in its proper forward direction, and counteracts the action of the earth against the moldboard in its turning. The back edge of the landside,

`from the heel B to the top G,`which bears against the beam, risesin a curve inclining toward the front, the curve being identical, or nearly so, with that of the front or cutting edge of the mold-board c D.

The handles ofl the plow are at their inner ends brought together, so as to be fastened to and between the mold-board and landside, at about half the height between the bottom of the landside and the beam, as shown in Fig. 2, Where the plow is represented as turned bottom upward, where d d are the ends ofthe handles and e a screw-bolt, which draws them upward against ledges cast on the landside and mold-board to Sustain them, the bolt e passing up through the beam and conning the whole together. By this plan the inner ends of the handles are removed out of the influence of the friction and clogging of the earth, grass, &c.

The clevis whichluse is of an improved form, and is made of cast-iron. It is represented separately in Fig. 3. It may be xed either to the top, bottom, or side of the beam. The portion ff, by which it is fastened to the beam, iS concave on its inner side, and should be in the concave part about tive inches in length and about two and one-halfinches wide. Itmust be iitted to the end of the beam, and to Acheck any tendency to being drawn forward it has a ledge or ridge across it at h, which is let into the beam. A single screw-bolt passingthrough the hole g and through the beam contines it securely in place. rectly through the beam, but is inclined back toward the plow, so that in straining the nut it tends to draw the clevis back, and resists the forward draft the more perfectly. The head and nutof the bolt., of course, have bearings which adapt them'to the position of the bolt. The end of the clevis I make about twonnd one-half inches from the concave to its front edge and about four and one-half inches wide. There may be three holes in it, jjj, three-fourths of an inch in diameter, the holes and end being rounded and having in thickness the substance of metal of about an inch each way.

What I claim as my improvements in the plow, and wish to secure by Letters Patent, 1s-

1. The curved form given to the heel of the landside, and also the concave form of its back edge as it rises from the heel to the beam,

as herein Set forth. Y

2. The manner of stocking the plow, so far as the fixing of the handles is concerned, by causing their inner ends to meet about midway between the bottom of the landside and the beam, and confining them there in the way described.

3. The cast-iron clevis, formed and attached to the beam, substantially as herein set forththat is to say, embracingthe beam by its concave part, and having a ridge let into the beam, and the bolt inclined backward to resist the direct action of lthe draft.

STEPHEN MGCORMIOK.

Witnesses:

' THos. P. JONES,

W. THOMPSON.

The bolt does not pass di-

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