US1403937A - Subsoiler - Google Patents

Description

use, and Figure UNITED STATES PATENT OFFICE.

SUBSOILER.

Specication of Letters Patent.

Patented Jan. 17, 1922.

Application led December 4, 1920. Serial No. 428,371.

To'v all whom it may concern.'

e it known that I, Jnss F. BELKNAP, a citizen of the United States, and resident of range Cove, county of Fresno, State of California, have invented a new and useful Improvement'in Subsoilers, of which the following is a specification.

e present invention, While relating to subsoilers or harroWs, has reference more particularly to a tooth or blade for such implements.

The primary object of the invention is to provide an improved tooth of the character described, Which will carry out its intended use with the greatest of efficiency.

more specific object of the invention is to provide a tooth for use in subsoiling or breaking up hardpan earth which Will be rugged in construction, yet light in weight, and unusually durable regardless of the hardened condition of the soil surface with which it is used.

With these and further objects is view, the invention will be more readily understood upon reference to the accompanying drawing, in which Figure l is a perspective view of the tooth; Figure 2 is a side eleva-tion partly in section, showing the position of the tooth relative to the ground surface when in 3 is a cross-'section on the line 3 3, Figure 2.

It is of course Well-known that teeth of subsoilers, harrows and the like are arranged in gang formation on a suitable drag frame; however, in so far as concerns the salient features of the present invention, only one of the teeth has been used for the purpose of illustration, as the invention resides in the tooth per se rather than in any detailed construction of the drag frame.

The tooth represents a rectangular shaped piece of metal (5) comprising the mounting end, having an equal thickness for a. portion of its length, With the soil-engaging point or end thereof cupped, ror spoon-shaped, as at 6) With the back'thereof rounded as at (7) and terminating, together with the spoonshaped front, in a relatively sharp point (8) the thickness of the spoon-shaped end increasing from the point (8) slightly beyond the middle of the rounded back (7) and then gradually diminishing in thickness and terminating in a length of equal thickness as above mentioned.

he tooth may be mounted to any suitable frame, such as (9), which may have a bar as at (l0) With openings therethrough and openings (ll) in the tooth corresponding to the openings in the bar, so that bolts or the like (l2) may be used as a fastening means. he openings (ll) in the tooth are countersunk on one side to receive the heads of the bolts.

The tooth, or teeth, as there may be a number of them, may be made of tool steel, with the point, or spoon-shaped end hardened so that the same may be effectively used Without bending or breaking on hardpan top soils.

By producing the cutting or soil-engaging end of the tooth in this Way, the same may be made thinner Without sacrilicing strength and durability, which is highly desirable in implements of this kind. It is to be noted that the bar (l0) overlies substantially that part of the tooth Which isv oi equal thickness, Whereas the increased thickness due to the peculiar shape of the end starts near the end of the bar, and in this Way any tendency of the tooth to bend at any point throughout its length is overcome.

It is of course obvious that the spoon (6) of the cutting edge is faced toward the direction of draft, With the tooth mounted at an angle to the ground surface.

I claim:

A subsoiler tooth Wit i its opposite end terminating spoon midway of its lower edge and the beginning of the mounting end, the thickness of the material at the greatest transverse dimension of the spoon shaped soil engaging device being greater than that of the mounting end, and the mounting end adapted to be to a frame member substantially throughout its entire length.

JESS F. BELKNAP.

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