US2897905A - Tandem disc harrow - Google Patents

Description

Aug. 4, 1959 Filed July 3, 1957 H. F. MCCLESKEY 2,897,905

TANDEM DISC HARROW 5 Sheets-Sheet 1 INVENTOR 1 I I BY l 1 I4 ATTORNEYS.

g- 1959 H. F. MOCLESKEY 2,897,905

TANDEM DISC HARROW Filed July 3, 1957 5 Sheets-Sheet 2 fl f/C C165 Key INVENTOR ATTORNEYS Aug. 4, 1959 Filed July 5, 1957 H. F. M CLESKEY TANDEM DISC HARROW 5 Sheets-$heet 3 bf ff? CZesiiey INVENTOR BY W- ATTORNEYS.

Aug. 4, 1959 H. F. MCCLESKEY 2,897,905

TANDEM DISC HARROW Filed July 5, 1957 5 Sheets-Sheet 4 H. E f/c C'Zesfi'ey INVENTOR BY W.

ATTORNEYS.

United States Patent: Ofiice 2,897,905 Patented Aug. 4,

2,897,905 TANDEM DISC HARRow Henry F. McCleskey, Marietta, Ga.

Application July 3, 1957, Serial No. 669,748

1 Claim. (Cl. '172--581) This invention relates to disc harrow construction and more particularly to disc harrow construction of th tandem type.

An important object of the invention is to provide a harrow embodying a pair of pivotally connected discgang sections with adjusting means whereby the angle of operation of the discs may be varied to meet the requirements of use and without the necessity of using wrenches or other tools. 1

An object of the invention is to provide a disc harrow of the tandem type wherein the rear disc gang section may be swung vertically out of contact with the ground surface with the result that the weight of the rear section will be carried by the front section resulting in a deeper penetration when using the front section only as a harrow.

A still further object of the invention is to provide disc harrow section frames which are provided with horizontal supporting arms adjustable to various angular positions with respect to the side rails of the frame to vary the angle of operation of the discs, the discs being arranged in groups which may be readily and easily removed and reversed for a particular use. 7

With the foregoing and other objects in view which will appear as the description proceeds, the invention consists of certain novel details of construction and combinations of parts, hereinafter more fully described and pointed out in the claim, it being understood that changes may be made in the construction and arrangement of parts without departing from the spirit of the invention as claimed.

Referring to the drawings:

Figure 1 is a plan view of a tandem disc harrow constructed in accordance with the invention.

Fig. 2 is a side elevational view thereof.

Fig. 3 is a front elevational view thereof.

Fig. 4 is a rear elevational view of the harrow.

Fig. 5 is an enlarged plan view of the tandem disc harrow frames with the disc-gangs removed.

Fig. 6 is a sectional View taken on line 66 of Fig. 1.

Fig. 7 is a sectional view taken on line 7--7 of Fig. 1.

Fig. 8 is a fragmentary sectional view taken on line 8-8 of Fig. 4.

Referring to the drawings in detail, the harrow comprises the forward section 5 and a rear section 6, the section 5 being provided with a hitch 7 by means of which the harrow may be attached to a tractor. The hitch comprises bearings 8 secured to the forward bar 9 of the forward harrow section, the arms 10 of the hitch extending vertically, as shown by Fig. 4 of the drawings. Pivotally connected between the arms 10 is a bearing 11 formed on one end of the rod 12, which rod 12 has threads 13 threaded into one end of the turnbuckle 14. Rod 15 has its threaded end 16 also threaded in the turnbuckle 14 so that by rotating the turnbuckle 14 through the medium of the rod 17, the angle of the pitch may be varied to adapt it for attachment to tractors of various designs.

The rod 15 is provided with the bearing 18 that operates in bearing openings in the members 19 that extend upwardly from the bar 20' of the forward harrow section.

The bars 9 and 20 of the forward harrow section connect with the end bars 21 which have upper and lower rear harrow section to the forward harrow section.- As' better shown by Fig. 1 of the drawings, spaced plates 23 are welded to the upper and lower portions of extended ends 22 and lie on opposite sides of the end bars 21, the end bars 21 and spaced plates 23 being provided with registering openings to receive the connecting pins 24 and 25, which may be removed and replaced at will of the operator. Thus it will be seen that due to this construction, the harrow sections may be connected and the harrow used as a tandem disc harrow, or the rear pins 25 may be removed and the rear section swung upwardly so that the weight of the rear section is supported by the front section adding weight to the front section, to cause the discs to be hereinafter more fully described, to penetrate deeper than under normal conditions.

It might be further stated that by removing the rear pins 25, the rear section of the harrow will be permitted to float and follow irregularities in the ground surface being cultivated or harrowed. Each harrow section includes a central horizontal bar 26 that provides supports for the upper and lower plates 27 that are mounted against the upper and lower surfaces of the central horizontal bars of the sections. The reference character 29 indicates the supporting bars for the disc-gang sections, which bars are pivotally connected at their inner ends between said plates 27, said bars 29 resting between the end bars 21 that are spaced apart a distance to receive the bars 29 for limited sliding movement. Rising from the central portion of each of the plates 27 is an internally threaded bearing 31 through which the threaded end of the adjusting screw 32 extends, the adjusting screw being rotatably mounted in the bearing means 18, 19

associated therewith so that rotation of the screw 32 of each harrow section, will result in movement of plates 27 to move the inner ends of bars 29 to vary the angle of the bars 29 with respect to the end bars of the harrow frame sections and consequently vary the angle of operation of the disc harrow blades supported by the bars 29.

Connected with one end of the adjusting screw 32 of each harrow section, is an operating rod 34 effecting rotation of the adjusting screw to accomplish the adjustment of the inner ends of the bars 29 and providing an adjustment for the bars 29 to be made without the use of wrenches or the like. The harrow gangs are indicated generally by the reference character 35, each of which embodies a horizontal shaft 36 that operates in bearings 37 formed at the lower ends of the arms 38, thearms 38 having right-angle ends 39 that are fitted against the lower surfaces of the bars 29 where they are securely bolted to the arms 29 by means of U-shaped bolts 40. Thus, it will be seen that the disc-harrow blade-gangs may be readily and easily removed and reversed to change the angle of operation of the discs to suit individual conditions.

The disc blades indicated by the reference character 41 are mounted on the shaft 36 and spaced apart by means of the spacers 42 which are held in place by cotter keys. In view of the fact that the front and rear harrow sections are identical, the forward section only of the harrow, has been described in detail.

What is claimed is:

A disc harrow comprising a frame including a front section and a rear section, each of said sections including an outer cross bar, an inner cross bar, and side bars,

means detachably securing said side bars in aligned rela- 6011, said means including a pivot whereby upon release of the detachable securing means said rear section may be pivotally swung over said frontsection, a center bar in each section, plates movably mounted on each center Bar, horizontal bars pivoted at their ends to said plates, means movably connecting said horizontal bars at an intermediate point to said side bars, a threaded bar on each plate, a second bar on a cross bar of each section, a threaded IOd' extending through each second bar and engaging each threaded bar, a handle on each threaded rod for moving its associated plate to vary the angle of its associated horizontal bar and disc harrows supported by each horizontal bar.

References Cited in the file of this patent UNITED STATES PATENTS

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