US3316982A - Harrow attachment hook component - Google Patents

Description

y 2, 1967 R. BOBROWSKI 3,316,982

HARROW ATTACHMENT HOOK COMPONENT Filed Dec. 21, 1964 INVENTOR. RHE l N HA RD BOBROWSKI United States Patent Ofitice 3,316,982 HARROW ATTACHMENT HOOK COMPONENT Rheinhard Bobrowski, Morris, Manitoba, Canada, assignor to Manitoba Development Fund, Winnipeg, Manitoba, Canada Filed Dec. 21, 1964, Ser. No. 419,639 1 Claim. (Cl. 172-677) My invention relates to new and useful improvements in harrow hook components which permit the harrow sections to be connected to a harrow draw bar or the like by means of chains.

Conventional hook components on harrow sections are normally open hooks having projecting corners or the like which permit the chains to become unhooked from the harrow sections particularly during turns.

Furthermore the corners on such hooks often are en gaged by an additional link of the chain while turning thus upsetting the draft characteristics of the harrow sections.

I have overcome these disadvantages by providing a hook component preferably for-med from a stamping and having a central aperture formed therein, the hook curving smoothly over and into the aperture with the distal end of the hook terminating substantially flush with the underside of the component so that a chain link has to be inserted within the aperture before it can be engaged on the hook.

This prevents undesirable disengagement of the chain and also prevents undesirable fouling of other links upon the hook component particularly when turns are made with the harrows.

The principal object and essence of the invention is there ore to provide a device of the character herewithin described which prevents undesirable disengagement of the chains from the harrow hooks.

Another object of the invention is to provide a device of the character herewithin described which is simply formed from a stamping thus making it extremely economical in manufacture.

A yet further object of the invention is to provide a device of the character herewithin described which provides means to support the strap normally transferring the load from the rear harrow member to the next adjacent member.

Still another object of the invention is to provide a device of the character herewithin described which is simple in construction, economical in manufacture, and otherwise Well suited to the purpose for which it is designed.

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 1 is perspective fragmentary view of a portion of a harrow showing my invention thereon.

FIGURE 2 is a top plan view of the attachment hook component.

FIGURE 3 is a side sectional elevation of FIG. 2 and showing the method of attaching the chain link to the hook.

In the drawings like characters of reference indicate corresponding parts in the different figures.

Proceed-ing therefore to describe the invention in detail, reference character illustrates the [front transverse frame member of a harrow and 11 the next adjacent frame member, said frame members being maintained in spaced apart relationship by means of the cross members 12.

3,316,982 Patented May 2, 1967 It will be appreciated that this is only one section of a harrow, but as the other sections are similar, it has not been deemed necessary to illustrate same.

It should also be appreciated that although the portion of the harrow illustrated is what is known as a diamond harrow, nevertheless the attachment component can be utilized with any type of harrow.

My devicecolleotively designated 13 comprises a sub stantially rectangular stamping 14 being provided with a centrally located aperture 15. The walls 16 bounding the aperture form a substantially rectangular aperture clear through the stamping and a book 17 is also formed integrally With the stamping and extends from the side edge 18 thereof. This book curves upwardly over and towards the center of the rectangular stamping 14 as shown in FIG. 3 and the distal end 19 of the hook terminates substantially centrally within the aperture 15 and substantially in the plane of the undersurfa-ce 20 of the stamping as clearly shown in FIG. 3.

A pair of lugs 21 are also tformed integrally with the stamping upon the opposite side edge 22 to the edge 18, said lugs inclining upwardly and outwardly.

A strap 23 is bolted to the next adjacent frame member 11 of the harrow and extends diagonally towards the frame ing same from pivoting with relation to the frame member 10.

In operation, the chain link 25 is inserted within the aperture 15 so that it is engaged over the distal end 19 of the hook 17. It is then rotated through the arc indicated by arrow 26 to take up the position shown in phantom in FIGURE 3.

This means that it is almost impossible for the hook to be disengaged inadvertently during the turning operation.

The smooth contour of the outer surface 27 of the book also prevents undesirable entanglement of the other chain links, an occurrence prevalent with conventional hooks due the turning operation.

Since various 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:

trap, a single fastening element extending through said he end port-ion of the strap and through said rear piece f the plate and through said first frame member wherey to provide sole means for securing the same together, .nother fastening element securing said strap to the sec- |nd frame member of the harrow frame in spaced relaion from the first mentioned fastening element, and a ai r of transversely spaced upturned lugs provided inegrally at the rear edge of the rear piece of said plate n alignment with said side pieces thereof, the translerse spacing of said lugs being such that they abuttingy engage the opposite sides of said one end portion of References Cited by the Examiner UNITED STATES PATENTS 9/1882 Johnson 172-677 X 8/1890 Bowman 172-677 X 10 ABRAHAM G. STONE, Primary Examiner.

A. E. KOPECKI, Assistant Examiner.

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