US576817A

US576817A - Blank for plowshares

Info

Publication number: US576817A
Authority: US
Publication date: 1897-02-09
Anticipated expiration: 1914-02-09

Description

T. M. MOORE & A. RAWLEY.

(No Model.)

BLANK FOR PLOWSHARBS.

O- ,817. Patented Feb. 9 1897.

Nrrnn STATES PATENT Fries.

THOMAS M. MOORE AND ARCI-IABLE RAWVLEY, OF SOMERVILLE, NEW JERSEY.

BLANK FOR PLOWSHARES.

SPECIFICATION forming part of Letters Patent No. 576,817, dated February 9, 1897.

Application filed February 27, 1896. Renewed January 12, 1897. Serial No. 619,017. (No model.)

To all whom it may concern.-

Beit known that we,THOMAs M. MOORE and AROHABLE RAWLEY, citizens of the United States, residing at Somerville, in the county of Somerset and State of New Jersey, have invented certain new and useful Improvements in Blanks for Plowshares; and we do 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, reference being had to the accompanying drawings, and to the letters of reference marked thereon,which form a part of this specification.

This invention relates to certain new and useful improvements in blanks for the manufacture of plowshares. 1

The invention has for its object the production of blanks for plow shares or points, which latter are made each of a single piece or sheet of rolled steel and having the parts most liable to wear. reinforced and provided with sufficient material for repeated drawings to sharpen and renew the point, while this sharpening or drawing can be accomplished by unskilled smiths without danger of parting welds or injury to the share.

In the manufacture of steel plowshares the general practice has been to weld the short landside or shin to the main portion or wing of the share. lVe are aware that shares have been made of sheet-steel in which the short landside or shin has been. integral with the wing, the angle being formed by a simple fold of the metal. This process, however, affords little or no stock of material at the wearing.

point of the share for drawing and sharpening and requires the welding thereon, either originally or at the time of sharpening, of extra metal. It will be seen that in case the shin or short landside is welded to the wing, or in case extra metal is provided by welding, the chances are that the unskilled smith will in drawing and sharpening part or raise the welds, and thus ruin the entire share.

It should be understood that the point of the share, being that portion to the left of the line 5 5 in Figure 4 of the drawings, wears away and becomes dull much more quickly than the balance of the share and that the subsistence of this point portion constitutes the will be hereinafter described, andillustrated in the accompanying drawings, which, with the letters of reference marked thereon, form a part of this specification, like letters of reference indicating the same parts throughout the several views, and in which drawings Fig. 1 is a bottom plan View of the blank of sheet steel from which the plowshare is formed, its outline and the grooves formed by the dies in the first step in the process being shown. Fig. 2 is a perspective view. of a portion of the blank, showing the results of the first and second steps taken in carrying out the process, with the short landside and reinforcing-lip turned over, upon the line 2 2 of Fig. 1. Fig. 3 is a like view showing the appearance of the blank after the first, second, and third steps of the process, the reinforcing-lip being shown as turned down fiat. Fig. 4 shows the appearance of the blank after the first, second, third, and fourth steps of the process, the same being the appearance of the finished share so far as pertinent to this invention. Fig. 5 is a cross-section upon the line 5 5 of Fig. 4:. Fig. 6 is a like section upon the line 6 6 of Fig. 4. Fig. 7 is a cross section of the blank upon the line 7 7 of Fig. 1, showing the male and female dies and the effect produced thereby upon the blank. Fig. 8 is a section of the blank upon the line 8 8 of Fig. 1, showing the form of die used in cutting through the blank at this point.

In carrying out our invention we employ a sheet of steel of the proper gage, which is sheared to the general outline of Fig. 1 of the accompanying drawings, the same comprising the body portion A of the blank, which is in the form of the wing of an ordinary plowshare, the portion B, which conforms to the usual short landside, and the portion C, which we term the reinforcing-lip and which supplies the extra metal employed in reinforcing the plow-point, as will hereinafter appear. This blank is first heated and placed on a female die having a flat surface, excepting only V shaped grooves corresponding with the lines 2 2 3 3 and a shearing-groove upon the line 4 4c. The male die has projecting V- shaped knives on lines coincident with the lines in the face of the female die and a shearing-knife D further protruding on the line 4: l. The male die in falling forces its way into the blank and the knives E form grooves in the upper face of the blank, force the metal out laterally from the groove, and thus form the raised portions or ridges e e, which extend along the side edges of the grooves upon each side of the same, and also force the metal into the grooves in the female die, as shown at e in Fig. 7. The same downward movement of the male die also serves to carry the blade or cutting edge of the knife D entirely through the blank upon the line 4: 4-, as shown in Fig. 8 of the drawings. The result is a weakening of the blank upon the lines 2 2 and 3 3 and the projecting lips c 0 upon the face of the blank and corresponding V-shaped exten sion or ridge 0 upon the opposite face of the blank.

The next succeeding step in the operation consists in the folding over of the portions 13 and O to produce the result shown in Fig. 2 of the drawings. This folding, it will be seen, results in the closing of the groove upon the line 2 2, while the ridge 0 upon the under face of the blank serves to form a sharp and Welldefined edge instead of the rounded edge which would otherwise be produced were the groove and ridge which we have described omitted. A perfect cutting edge of the share is thus provided without removing any portion of the metal or weakening the share, as when the metal is folded the side faces of the groove are forced together ready to be reunited, (as will be shown later,) and the extra metal provided in the ridges e 6 serves to reinforce and strengthen the angle upon its inner side, as will be readily understood.

The object of cutting entirely through the metal blank upon the line 4 4 is to permit the folding over of the reinforcing-lip O, which is accomplished in the next succeeding step in the operation, without displacing or injuring the short landside. This last-mentioned step consists in folding under the reinforcing-lip C more or less flat with the face of the share, as is illustrated in Fig. 3, and producing a solid metal point to the plowshare, as is shown in detail in Fig. 5 of the drawings.

The next succeeding and final step consists in heating the metal to a welding heat, re uniting the abutting edges of the grooves, the drawing out the point longitudinally, as indicated in dotted lines in Fig. 1, and in drawing out the cutting edges, as shown in Fig. 5, forming the shape or curve of the share, and thus producing a complete and perfect plowshare, such as is shown in Fig. 4. of the accompanying drawings.

The last or finishing operations being performed by means of dies in common use among plow-makers, we refrain from more particularly describing or illustrating them.

Having thus described our process, what we claim to be new, and desire to secure by Letters Patent, is

1. A blank of sheet metal for use in making a plowshare from sheet-steel, the same consisting of a sheet of steel sheared to conform to the size and shape of the wing and short landside of a plowshare, and having an extra lip or extension, as shown at C, for re inforcing the plow-point, substantially as described.

52. A blank of sheet metal for use in making a plowshare from sheet-steel, the same comprising a sheet of steel sheared to conform to the size and shape of the wing and short landside of a plowshare and having a transverse slit and an additional lip or extension for reinforcing the plow-point, substantially as shown and described.

A blank of sheet metal for use in making a plowshare from sheet metal, the same comprising a sheet of steel sheared to conform to the size and shape of the wing and short landside of a plowshare and having a transverse slit and grooves as described and an additional lip or extension for reinforcing the plow-point, substantially as shown and. de scribed.

In testimony whereof we aifix our signatures in presence of two witnesses.

THOMAS M. MOORE. ARCHABLE RAYVLEY. Witnesses:

ll. VANDEMARK, \VHP. STACY.