US2690112A - Replaceable plow share point - Google Patents

Description

Sept. 28, 1954 R. c. FREVIK 2,690,112

REPLACEABLE PLOW SHARE POINT Filed Nov. 15, 1949 2 Sheets-Sheet l INVENTOR.

##1## C? fiR'V/A P 28, 1954 R. cfFREvlK REPLACEABLE PLOW SHARE POINT 2 Sheets-Sheet 2 Filed NOV. 15, L949 'INVENTOR. Awz/w/ c: near/x Patented Sept. 28, 1954 UNITED STATES PATENT OFFICE REPLACEABLE PLOW SHARE POINT Ralph C. Frevik, Detroit, Mich., assignor, by mesne assignments, to Ford Motor Company, Dearborn, Mich., a corporation of Delaware Application November 15, 1949, Serial No. 127,403

1 Claim. 1

This invention relates to an improved replaceable plow point for moldboard plows.

Heretofore, there have been a large number of constructions of replaceable plow points proposed, but no prior constructions have met with any substantial degree of success, primarily because such points were either not adequately supported and secured on the plow, or the cost of the replaceable point so nearly approached the cost of the more conventional integral share and point that the farmer did not realize any substantial economic advantage in purchasing the replaceable points.

In accordance with this invention, the manufacturing cost of a replaceable point for a moldboard plow is substantially reduced due to the virtual elimination of the gunnel portion of the replaceable point, i. e., that portion of the point which defines the landside face of the plow point and generally projects rearwardly a substantial distance from the extreme forward end of the plow point. Heretofore, such gunnel portion has generally been considered necessary to adequately support the cutting end of the plow point and, accordingly, has been formed with relatively massive dimensions, thereby forming a substantial portion of the total cost of the replaceable point. However, in actual use, such gunnel portion is subjected to little wear compared to the cutting face of the plow point, so that when a farmer discarded a plow point because of wear of the cutting surfaces, he was discarding the relatively unimpaired gunnel portion as well.

As indicated above, a replaceable plow point embodying this invention substantially eliminates such gunnel portion and the forward end of the landside of the plow is extended to underlie a substantial portion of the replaceable plow point and perform the supporting functions of the eliminated gunnel portion. Hence, in effect, substantially all of the material entering into a replaceable plow point embodying this invention forms part of the wearing surfaces of the plow point and when a worn plow point is replaced, the farmer is not discarding a relatively unused gunnel portion.

Still another feature of this invention is the provision of an improved arrangement for effecting the rigid securement of a replacement plow point to a moldboard plow. A plurality of surfaces on the plow point are caused to interlock with cooperating surfaces on the landside, the frog and the moldboard so that the plow point 2 is securely locked in assembly by a minimum number of bolts.

Accordingly, it is an object of this invention to provide an improved plow point construction for a moldboard plow which can be securely mounted and supported on the plow and yet be conveniently replaceable when worn.

Another object of this invention is to provide unusually economical replaceable plow point constructions for a moldboard plow characterized by the substantial elimination of the gunnel portion of the plow point and the utilization of a forward extension of the plow landside to perform the supporting functions of the eliminated gunnel portion.

The specific nature of this invention, as well as other objects and advantages thereof, will become apparent to those skilled in the art from the following detailed description, taken in conjunction with the attached sheets of drawings on which, by way of preferred example only, are illustrated various modifications of this invention.

On the drawings:

Figure 1 is a side elevational View of a moldboard plow from the landside side, showing a replaceable point secured to the plow in accordance with one modification of this invention.

Figure 2 is a plan view of the-forward end of the plow shown in Figure 1 with the moldboard removed.

Figure 3 is an elevational view showing a modified manner of securing the plow point to the extended landside wherein a dovetailed joint is utilized.

Figure 4 is a plan view of Figure 3.

Figure 5 is a cross sectional view taken along the plane 55 of Figure 3.

Figure 6 is a plan view of the forward end of a plow showing still another modification of this invention wherein the replaceable plow point is supported by an extended portion of the frog and the landside.

Figure 7 is a side elevational View of Figure 6.

Figure 8 is a sectional view taken along the plane 8-8 of Figure 6.

Figure 9 illustrates a further modification of this invention and is a side elevation view of the front end of a plow.

Figure 10 is a cross sectional view taken along the plane Ill-ill of Figure 9.

Figure 11 is a cross sectional view taken along the plane l l! I of Figure 1.

Figure 12 is a fragmentary plan View of Figlife 9.

As shown on the drawings:

Briefly, this invention comprises a replaceable plow point having an exterior contour shaped to blend with the contour of the share and the moldboard. The landside is provided with an extended tapered point which is recessed in an interior pocket formed on the replaceable point and such point is removably secured to such extended landside portion. The frog is also extended and such extension cooperates with a recess in the replaceable plow point whereby such point is also mounted on the frog. The share is arranged abutting relationship with the replaceable point so that in cooperation with the landside, the replaceable point is locked against rocking movemerit and is thus rigidly secured to the plow.

lhere is shown in Figure l a plow construction comprising a moldcoard ii; of conventional configuration secured. to a frog it and beam if? by a pair of bolts ii.

cg it below moldboard is by a pair of screws Share it is of conventional construction but is without the usual share point, thereby foreshortening such share and the end thereof squared off shown at "ill in Figure 2.

.pro provided with a forwardly projecting, tapering end portion 2i on which is mounteda replaceable plow point 21 Plow point 22 has n exterior configuration substantially conforming to the shape of the conventional integral point. Point 253, however, is provided with a rearwardly opening recess 23 so that such point be snugly slipped over the projecting end portion ill of frog l6. Recess 23 also opens down wardly, as best shown in Figure 11. Point 2f is provided with a squared end surface 2 which outs the end surface of share it. A second recess 25, which communicates with recess it, is provided on the landside face of point 22 for a purpose to be presently described.

A landside member 28 is secured to frog it on the side opposite moldboard by a pair of screws Landside 2e is provided with a tapered front end portion 28 as shown in Figure l. The recess 25 in the landside to snugly receive the tapered end portion of landside 26. The upper top surface 29 of the front end portion of landside 26 abuts a shoulder 3E9 defined by recess 25. A transverse screw ti inserted in a suitable hole in the forward end of the end portion 28 of landside 26 engages a threaded hole 32 in point 22 to secure point 22 to the tapered end portion of landside it. Also, a screw 33 is provided to secure point 22 to frog it as shown in parent that the abutment of the upper surface 29- of the tapered end portion of landside 2% with shoulder 39 in point 22 and the abutment of the end of share it with point 22 substantially elimi-- nates any possibility of rocking of point 272 when mounted on the plow. Screws 3! and i3 permit rapid and convenient disassembly of the point 22 from the plow to permit replacement thereof when such point is worn beyond use.

In Figures 3, 4 and 5, there is illustrated a modification of the replaceable point shown in Figures 1 and 2 wherein a tapered dovetail is provided on the landside which engages a corresponding dovetailed slot provided in the replaceable point. The elements of the plow shown in Figure 2 correspond to those shown in Figures 1 and 2; however, in this instance, the landside 26 of this modification is provided at its forward end with a wedge-shaped point 34 having dovetail or beveled edges, as best shown at 35 in Fig- A share I8 is secured to face of plow point 2?; is shaped Figure 2. Thus, it is readily apmoldboard 5T.

ure 5. A dovetailed slot 36, which communicates with the frog receiving recess 23, is provided in the landside face of point 22 and corresponds in shape to the dovetailed end of landside A screw 31 in the forward end of wedge-shapel point 34 secures point 22 to landside As in the arrangement shown in Figures 1 and 2, the landside and share in this construction rigidly supports the point 22 against rocking or other displacement.

A further modification of a replaceable plow point embodying this invention is shown in Figures 6, '7 and 8. In such modification, the frog 38 is provided with an extended substantially wedge-shaped toe portion as. A shortened share 40 is secured to frog 38 by a plurality of screws ll and such share has a squared front end sur face 4.2 which abuts a corresponding rear surface isa on replaceable plow point 13. Plow point ts is provided with a wedge-shaped recess at corresponding in shape and size to toe portion 39 of frog 38 for mounting the point on such toe portion. In contrast to the other modifications of this invention, recess M has a bottom wall (Figure 8). The plow point 43 assembled to toe portion 39 by sliding such point over the toe portion 39 and tapping the end of the point as with a hammer, whereby such toe portion is tightly wedged in recess M. A bolt secures point 43 to frog 38 as shown in Figure 8. The landside face of point ts is recessed as shown at to in Figures 6 and '7 to receive a slightly reduced end portion ii of a landside 38. Landside is is secured to frog 38 by screws Q9. lhe tapered end portion ll of landside ie snugly fits within the recess provided in point The upper surface 5! of end portion ll abuts a shoulder defined by recessed surface it to additionally support point Q3. The abutment of share so point 43 completes the locking arrangement thus effectively preventing rotation of the point.

In the modification shown in Figures 9 lo, the landside 53 is provided with a forwar vly e: tending end portion 5a of L-shaped CO1 1 tion, as best shown in Figure 10. A replaces, is point 55 is provided which is mountable on frog 56, in much the same manner as described in the modifications shown in Figures and placed adjacent a share (not shown) In this modification, however, the landside surface of point 55 is recessed and the bottom surface of point 55 is also re to receive the L-shaped end M- of the landside in order that the point 55 will be flush with the landside on both the side and bottom of the front portion 53 thereof. A screw 58 vertically disposed in the bottom portion of the L shaped end 54 of the landside fastens point to such extended end portion 5 Three screws secure landside 53 to frog 56. As in the previously described modifications, the upper surface cf he forward landside portion t l abuts the shou defined by the recessed surface hi in point securely lock point to against rotation.

From the foregoing description, it is clearly apparent that there is here provided a replace" able plow point for a plow which may be readily and conveniently assembled to a plow of the moldboard type and, when assembled, is positively locked against the various forces acting on the point in plowing by the cooperating abutment of surfaces of the landside and share with the point.

It will, of course, be understood that many details of construction may be varied through a wide range without departing from the principles of this invention and it is, therefore, not the purpose to limit the patent granted hereon otherwise than necessitated by the scope of the appended claim.

I claim:

In a plow the combination of a frog provided with angularly disposed moldboard and landside surfaces, a landside, means for mounting said landside on said landside surface of said frog, said landside having a tip portion extending forwardly beyond said frog, said tip portion having an L-shaped vertical cross-section, a share Wing, means for securing said share wing to the moldboard surface of said frog with its forward edge disposed rearwardly of the forward end of said frog, a replaceable share point having a recess for receiving the forward edge of said frog, said share point having a rearward edge surface, means for securing said point to said frog with its rearward edge surface in abutment with the forward edge of said share wing, said share point having recesses respectively on its landside face and its adjacent bottom face constructed and arranged to receive said L-shaped extending tip portion of said landside in flush relationship therein, thereby rigidly supporting said plow point, and bolt means traversing each face of said L-shaped extended tip portion for remcvably securing said share point to said extended tip portion.

References Cited in the file of this patent UNITED STATES PATENTS Number Name Date 245,429 Ball Aug. 9, 1881 578,181 Wroten Mar. 2, 1897 1,048,962 Harrison Dec. 31, 1912 1,140,275 Mares May 18, 1915 1,155,917 Grubb Oct 5, 1915 1,559,066 Bohmker Oct. 27, 1925 FOREIGN PATENTS Number Country Date 227,371 Great Britain Jan. 15, 1925

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