US 2606413 A
Description (OCR text may contain errors)
Aug. 12, 1952 T. GRAY HARROW TOOTH Filed Nov. 9, 1946 FIG. I.
/n ven for: 4
Thomas Gray Patented Aug. 12, 1952 UNITED STATES FATENT OFFICE HARROW TOQTH Thomas Gray, Ituna, Saskatchewan, Canada Application November 9, 1946, Serial No. 708,899
1 Claim. 1
My invention relates to improvements in harrow teeth, an object being to provide a device of the character herewithin described consisting of a male portion permanently secured to the harrow framework, and a female point which is removable by the user when in need of resharpening. and which may be discarded when worn out and replaced by a new point without the necessity for unscrewing and screwing up.
A further object of the present invention contemplates a saving to the user over the conventional practice which consists in taking an entire harrow to the blacksmith where the teeth are removed, sharpened and replaced, in favour of the procedure which would consist in the users removal and replacement of the female point portions so that the blacksmith would only be called upon to do the actual sharpening.
With the foregoing objects in view, and such other objects and advantages as will become apparent to those skilled in the art to which this invention relates as this specification proceeds, my invention consists essentially in the arrangement and construction of parts all as hereinafter more particularly described, reference being had to the accompanying drawings in which:
Figure l is a side view of my improved harrow tooth with certain parts shown in section.
Figure 2 is a fragmentary exploded perspective view of the junction between the harrow point and attaching portion.
In the drawings like characters of reference indicate corresponding parts in the different figures.
My harrow tooth consists of two main parts which I designate as the male portion I, and the removable, female point 2, it being understood that the portion l is secured to a harrow framework by means of a screw-threaded end portion according to conventional practice for which reason the same has not been illustrated in the accompanying drawings,
The male portion l is provided with a circumscribing and projecting shoulder 3 upon the four right angled surfaces thereof so that the dolly portion 4 is of somewhat reduced crosssection in comparison with the upper portion 5 according to the thickness of the shoulder. It will also be seen that the lower end 6 of the dolly portion converges or diminishes upon the four sides thereof.
Upon the opposed wall surfaces 1 of the portion 5, I provide the pair of opposed recesses 8 which open onto the shoulder 3, these recesses being intended to receive the wing-lugs 9, 9' which project from the upper, open perimeter I0 of the socket II which forms part of the aforesaid point collectively designated 2.
The point 2 may also be considered, as will be apparent by reference to the accompanying drawings, as a ferrule consisting of the aforesaid socket and the pointed end I2 coterminus therewith, and it is to be understood that the ferrule aforesaid is squared like the male portion I.
The perimeter Ill of the socket ll abuts the shoulder 3, and in this position, when the winglugs 9 and 9' are hammered inwardly, it will be apparent that a binding engagement may be secured between the two main parts. Conversely, when the wing-lugs are pried outwardly with a hammer and chisel, the female portion can easily be removed by a slight tap with the chisel downwardly upon a portion of the wing-lugs 9 and 9' for resharpening or replacement.
Since various modifications can be made in my invention as hereinabove described and many apparently widely different embodiments of same made within the spirit and scope of the claim without departing from such spirit and scope, it is intended that all matter contained in the accompanying specification shall be interpreted as illustrative only and not in a limiting sense.
What I claim as my invention is:
A harrow tooth comprising in combination a male portion permanently secured to the harrow framework and a removable female point engageable therewith, said male portion having a circumscribing projecting shoulder thereon and a pair of opposed recesses formed in the wall thereof and opening onto said shoulder, said point comprising a ferrule consisting of an elongated socket into which said male portion is receivable, the open end of said socket abutting said shoulder, a pair of wing-lugs projecting from the open end of said socket capable of being hammered into frictional engagement with said recesses and of being pried outwardly to effect disengagement of said female point from said male portion, and a pointed end coterminus with said socket.
REFERENCES CITED The following references are of record in the file of this patent:
UNITED STATES PATENTS Number Name Date 1,119,248 Daly Dec. 1, 1914 FOREIGN PATENTS Number Country Date 452,174 Great Britain Aug. 18, 1936