US511664A - Harrow-tooth - Google Patents

Description

(.No Model.)

J. M. TOMLINS-ON HARROW TOOTH.

No. 511,664. Patented Dec. 26, 1893.-

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JOHN M. TOMLINSON, OF ARGHDALE, NORTH CAROLINA.

HARROW-TOOTH.

SPECIFICATION forming part of Letters Patent No. 511,664, dated December 26, 1893.

Application filed December 15,1892. Serial No. 455,285, (No model.)

l all whom it may concern.-

Be it known that I, JOHN M. TOMLINSON, of Archdale, in the county of Randolph and State of North Carolina, have invented certain new and useful Improvements in Harrow- Teeth; and I 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 pertains to make and use it, reference being had to the accompanying drawings, which form part of this specification.

My invention relates to an improvement in harrow teeth; and it consists in the novel features of construction which will be fully described hereinafter, and more particularly referred to in the claims.

The object of my invention is to provide an improved tooth of great strength, and one which is so formed that the harrow to which it is applied may be used for drag or smoothing purposes as desired.

Referring to the accompanying drawings, Figure 1 is a perspective View of myiinproved tooth when cast. Fig. 2 is a similar view of the same when formed of sheet steel. Fig. 3 is a plan view of the latter. Fig. 4 is a view of the blank from which the sheet metal tooth is formed.

Referring now to Fig. 1 which illustrates the cast tooth, A-designates the depending portion of the tooth which runs to a point at its lower end and which is formed with one vertical and one inclined edge as shown. Extending the whole length of the tooth is the rib or shoulder B, which serves to materially strengthen the tooth in resisting objects against which it strikes. Upon the upper end of the tooth are the oppositely extending flanges O, which rest against the under side of the harrow beam to which the teeth are secured and these flanges are perforated to accommodate securing bolts. The outer ends of the said flanges are turned up to form ears D, which extend up the sides of the beam of the barrow, thus holding the tooth securely in place and entirely free from lon gitudinal movement.

' In the construction illustrated in Fig. 2 the tooth is formed of sheet steel. The shoulder B, is formed by making a transverse bend in the center of the tooth which extends its whole length. This flange tapers from its upper to its lower end at which latter point it disappears so that at the extreme end or point of the tooth the latter is flat. The upper ends of the tooth sides adjacent the flange B, are bent laterally in opposite directious to form flanges C, and these latter are turned up at their ends forming ears D, and these flanges and ears perform the same functions as the corresponding parts of the structure illustrated in Fig. 1 which is described above. It will be seen that in forming the sheet metal tooth it is necessary to cut away a smallportion of the same at the upper end of the shoulder B, as shown in Fig. 4.

The vertical flange or shoulder extending the whole length of the tooth is especially desirable when the latter is formed of sheet metal as great strength is thereby given to the tooth and it is thereby very effectually braced from twisting and turning.

In applying the teeth to a harrow frame all the vertical edges of the same extend in one direction while consequently all the inclined edges extend in the opposite direction. In moving the harrow forward with the vertical edges of its teeth in engagement with the ground the latter will be thoroughly cut up and pulverized, the teeth entering their whole length into the ground. When moving in the opposite direction the implement acts as a'smoothing harrow, running over the ground with the inclined edges presented to the same. The earth is not stirred up so much as it is'smoothed over and pulverized.

Having thus fully described my invention, what I claim as new, and desire to secure by Letters Patent, is

1. An improved harrow tooth formed in two blade sections which diverge upward from a common point, and a tapering rib connecting the adjacent edges of the sections, substantially as shown and described.

2. A substantially fiat harrow tooth having two cutting edges, and a longitudinal rib or flange on said tooth which tapers toward the lower or point end of the same, substantially as shown and described.

3. An improved harrow tooth formed of sheet inetalhavinga longitudinal bend formed In testimony whereof I affix my signature in therein which constitutes a strengthening rib, presence of two Witnesses. the said rib or flange tapering toward the point of the tooth, and securing flanges bent JOHN TOMLINbON' 5 in opposite directions on the respective sides Witnessesz" of the upper end of the tooth, substantially W. G. BRADSHAW,

as shown and described. 'J WALKER.

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