DESC:TECHNICAL FIELD
[001] The embodiments herein generally relate to agricultural implements and more particularly but not exclusively, to an agricultural implement having a height adjustable rotary shaft to prevent blade breakage or blade damage.

BACKGROUND
[002] A conventional agricultural implement includes a driven shaft on which are mounted a plurality of rotary tillage members having soil engaging blades the outer extremities of which are generally parallel to the shaft. The blades erupt the soil from below seed bed depth upwardly so as to open up the soil.
[003] Blades of the rotavator or rotary tillage members get damaged when blades encounter hard objects, such as stones, hillocks, both of which are usually present in abundance in fields. Further, the rotating shafts (such as first rotary shaft and the second rotary shaft) having the blades are prone to bend or damage on one direction due to prolonged usage which in turn affect the life of the rotary tillage members. The blades when pressed against hard objects may bend or break or disengage from the rotating shaft or suffer other serious damage which is undesirable.
[004] Therefore, there exists a need for an agricultural implement having a height adjustable rotary shaft to prevent blade breakage or blade damage.

OBJECTS
[005] The principal object of the embodiments disclosed herein is to provide an agricultural implement having a height adjustable rotary shaft to prevent blade breakage or blade damage.
[006] Another object of the embodiments disclosed herein is to provide the agricultural implement having a first shaft and a second shaft, and a plurality of slots defined in frame to adjust height of the second shaft at different positions to prevent blade breakage or blade damage.
[007] Another object of the embodiments disclosed herein is to provide the agricultural implement having the first shaft and the second shaft, and a locking pin engaged in the slot to lock the second shaft at different positions to prevent blade breakage or blade damage.
[008] Yet another object of the embodiments disclosed herein is to provide the agricultural implement having the first shaft and the second shaft, and a swivel mechanism to adjust height of the second shaft to prevent blade breakage or blade damage.
[009] These and other objects of the embodiments herein will be better appreciated and understood when considered in conjunction with the following description and the accompanying drawings. It should be understood, however, that the following descriptions, while indicating embodiments and numerous specific details thereof, are given by way of illustration and not of limitation. Many changes and modifications may be made within the scope of the embodiments herein without departing from the spirit thereof, and the embodiments herein include all such modifications.

BRIEF DESCRIPTION OF DRAWINGS
[0010] The embodiments of the invention are illustrated in the accompanying drawings, throughout which like reference letters indicate corresponding parts in the various figures. The embodiments herein will be better understood from the following description with reference to the drawings, in which:
[0011] FIG. 1 depicts a side view of a height adjustable rotary shaft, according to an embodiment as disclosed herein;
[0012] FIG. 2 depicts a side view of the first gear wheel meshing with the second gear wheel and swivel mechanism coupled to the second shaft, according to an embodiment as disclosed herein;
[0013] FIG. 3 depicts a side view of the first gear wheel meshing with the second gear wheel and the second gear wheel having more number of meshing teeth compared to the first gear wheel, according to an embodiment as disclosed herein;
[0014] FIG. 4 depicts a side view of a drive shaft gear wheel, the first gear wheel and the second gear wheel, according to an embodiment as disclosed herein; and
[0015] FIG. 5 depicts a perspective view of a rotavator having the drive shaft, the first shaft and the second shaft, according to an embodiment as disclosed herein.

DETAILED DESCRIPTION
[0016] The embodiments herein and the various features and advantageous details thereof are explained more fully with reference to the non-limiting embodiments that are illustrated in the accompanying drawings and detailed in the following description. Descriptions of well-known components and processing techniques are omitted so as to not unnecessarily obscure the embodiments herein. The examples used herein are intended merely to facilitate an understanding of ways in which the embodiments herein may be practiced and to further enable those of skill in the art to practice the embodiments herein. Accordingly, the examples should not be construed as limiting the scope of the embodiments herein.
[0017] The embodiments herein achieve an agricultural implement having a height adjustable rotary shaft to prevent blade breakage or blade damage. Further, the embodiments herein achieve the agricultural implement having at least one first shaft and at least one second shaft, and plurality of slots defined in frame to adjust height of the second shaft at different positions to prevent blade breakage or blade damage. Further, the embodiments herein achieve the agricultural implement having the first shaft and the second shaft, and a locking pin coupled to at least one of the slots to lock the second shaft at different positions at both ends of the second shaft. Furthermore, the embodiments herein achieve the agricultural implement having the first shaft and the second shaft, and a swivel mechanism to adjust height of the second shaft. Referring now to the drawings and more particularly to FIGS. 1 through FIG. 5, where similar reference characters denote corresponding features consistently throughout the figures, there are shown embodiments.
[0018] FIG. 1 depicts a side view of a height adjustable rotary shaft, according to an embodiment as disclosed herein. In an embodiment, the height adjustable agricultural implement 100 (also referred to as “agricultural implement” or “rotavator” in this description) includes a frame 102, at least one drive shaft 118 (not shown), a drive shaft gear wheel 118a, at least one first shaft104, said at least one first shaft 104 having a first gear wheel 104a, at least one second shaft 106, said at least one second shaft 106 having a second gear wheel 106a, a first slider 114a, a second slider 114b, a plurality of slots 108 defined in the first slider 114a, at least one pre-stressed spring 116 and at least one locking pin 110.
[0019] The agricultural implement 100, (also referred to as rotavator) includes the frame 102. The frame 102 includes a top cover 120 disposed between a left side wall 122 and a right side wall 124. The frame 102 further includes the drive shaft 118 (not shown) disposed at top of the frame 102. The first shaft104 and the second shaft106 are disposed between the right side wall 124and the left side wall 122. The first shaft104 is attached with the at least one gear wheel 104a at a first end 102a. Similarly, the second shaft106 is attached with the at least one gear wheel 106a at the first end 102a. In an embodiment, the drive shaft 118 includes a drive shaft gear wheel 118a which is connected (meshed) to the first gear wheel 104a.However, it is also within the scope of the invention to connect the drive shaft to second shaft without otherwise deterring the intended function of the rotation as can be deduced from this description and corresponding drawings. In an embodiment, the first gear wheel 104a is configured to mesh/engage with the second gear wheel 106a as shown in FIG. 1.
[0020] In an alternate embodiment, an idler gear 105 may be used between the first shaft 104 and the drive shaft118 or the second shaft 106 and the drive shaft, based on the direction of rotation required for the second shaft 106.In an embodiment, the idler gear 105 is used for rotating both the first shaft 104 and the second shaft 106 in same direction. In an alternate embodiment, the idler gear 105 is omitted for rotating first shaft 104 and the second shaft 106 in opposite direction.
[0021] The frame 102 further defines the first slider 114a. The first slider 114a is a U-shaped opening provided in the frame 102. The first slider 114a further defines a plurality of predetermined positions each having a slot 108 in the U-shaped opening. In an alternate embodiment, the first slider 114a may be provided separately (such as mounting brackets) and then coupled to the frame 102.The first slider 114a is defined on both sides of the frame 102.The second shaft106 is configured to move within the plurality of predetermined positions defined in the first slider 114a. The locking pin 110 is configured to lock the second shaft106 at the predetermined position defined by the first slider 114a.The locking pin 110 is configured to engage in at least one of the slot 108 defined in the first slider 114a to lock the second shaft106 at the predetermined position.
[0022] In an embodiment, the second shaft106 is positioned in such a way that it is always in contact with the first shaft 104. Based on the soil conditions a user or an operator may select the spacing between the first shaft 104 and the second shaft 106 by adjusting the locking positions. For example, the first slider 114a may include at least four positions (i.e. 1, 2, 3, and 4) and the second shaft106 is configured to move within the at least four positions. In an embodiment, if the user requires fine pulverization of the soil, the user can select position 1and if the user requires core pulverization with less force, then the user can select position 4.And if the soil includes lot of stones, roots etc, the user can choose the position 3or 4based on his requirement which in turn avoids the blade damage and also controls the quality of soil pulverization.
[0023] The agricultural implement 100 (also referred as rotavator) further includes the swivel mechanism. The swivel mechanism includes the second slider 114b defined in the frame 102, and at least one pre-stressed/pretension spring 116 disposed in the second slider 114b. In an alternate embodiment, the second slider 114b may be provided separately (such as mounting brackets) and then coupled to the frame 102.The second slider 114b is a U-shaped opening defined in the frame 102. The second slider 114bisdefined on both sides of the frame 102.The second shaft 106 is coupled with the second slider 114b and the at least one pre-stressed spring 116. The second shaft106 is configured to move within a predetermined sliding limit defined in the second slider 114b. The second shaft106 is connected to the second slider 114b to slide without disengaging from the first shaft 104.The pretension spring 116 maintains the position of the second shaft106 in a default compression stage (Closest position).In an embodiment, the swivel mechanism includes “n” number of swivels within the predetermined sliding limit based on a spring load acting on the at least one pre-stressed/pretension spring 116.
[0024] In an embodiment, space and position of blades of the first shaft104 and the second shaft106 are arranged in a predetermined manner such that it is enough for cutting the soil as per the requirement. When stone or root comes intermediate between blades of the first shaft104 and the second shaft 106, load on the cutting blades increases. In order to avoid breakage of the cutting blades the second shaft106 swivel to a predetermined position based on a force exerted on the cutting blades and allow the stone or root to pass through by creating more space between the first shaft104 and the second shaft 106. Based on the force, the pretension spring gets compressed until the stone or root passes and returns to the default position after the stone or root passes through it without causing the blade to break or deflect. The swivel mechanism facilitates in preventing damage to the cutting blades of the agricultural implement 100 by deflecting the second shaft 106.
[0025] FIG. 5 depicts a perspective view of a drive shaft, the first shaft and the second shaft, according to an embodiment as disclosed herein. The agricultural implement (rotavator) 100 includes a predetermined arrangement of gear teeth for the first gear wheel 104a and the second gear wheel 106a to achieve desired/required soil condition. In a first embodiment, the predetermined arrangement of gear teeth includes equal number of teeth on the first gear wheel 104a and the second gear wheel 106a. In a second embodiment, the predetermined arrangement of gear teeth includes more number of teeth on the first gear wheel 104a compared to the second gear wheel 106a. In third embodiment, the predetermined arrangement of gear teeth includes more number of teeth on the second gear wheel 106acompared to the first gear wheel 104a.For example, according to the third embodiment, the teeth ratio between the second gear wheel 106a and the first gear wheel 104avaries from 1.1 to 1.7. In the third embodiment, the second gearwheel 106a is provided with more teeth so that the first shaft 104is used for traction of the agricultural implement100 with predetermined torque on a field/ground and the second shaft106 for predetermined pulverization of soil by rotating at a higher speed. More teeth on the second gear wheel106a provides an advantage of achieving both traction and pulverization through single agricultural implement 100.In an alternate embodiment, the swivel mechanism may be integrated with the predetermined arrangement of gear teeth to prevent the blade damage or blade deflection by the stones or roots.
[0026] For the ease of description and better understanding of the embodiments, the agricultural implement 100 is considered as rotavator. It should be noted that the invention is not limited to the rotavator and may be implemented on any other implement without otherwise deterring the intended functions of the features of the invention as can be deduced from this description.
[0027] The foregoing description of the specific embodiments will so fully reveal the general nature of the embodiments herein that others can, by applying current knowledge, readily modify and/or adapt for various applications such specific embodiments without departing from the generic concept, and, therefore, such adaptations and modifications should and are intended to be comprehended within the meaning and range of equivalents of the disclosed embodiments. It is to be understood that the phraseology or terminology employed herein is for the purpose of description and not of limitation. It can be noted that those skilled in the art will recognize that the embodiments herein can be practiced with modification within the spirit and scope of the embodiments as described herein.
,CLAIMS:We claim,
1. A rotavator 100 for an agricultural vehicle, comprising:
a frame 102;
at least one first shaft104 and at least one second shaft106 mounted in said frame 102;
said frame 102 defining a first slider 114a, said first slider 114a further defining a plurality of predetermined positions each having a slot 108,said second shaft106 is configured to move within said plurality of predetermined positions defined in said first slider 114a;and
at least one locking pin 110 adapted to engage in said slot 108, said locking pin 110 is configured to lock said second shaft 106 at said predetermined position defined in said first slider 114a.
2. The rotavator 100 as claimed in claim 1, wherein said rotavator 100 includes a drive mechanism to transmit motion from power take-off shaft (PTO shaft) to at least one of said first shaft 104 and said second shaft 106.
3. The rotavator 100 as claimed in claim 1, wherein said rotavator 100 includes at least one first gear wheel 104a coupled to said first shaft 104 at first end 102a.
4. The rotavator 100 as claimed in claim 1, wherein said rotavator 100 includes at least one second gear wheel 106a coupled to said second shaft 106 at first end 102a.
5. The rotavator 100 as claimed in claim 2, wherein said drive mechanism includes a drive shaft 118 mounted in said frame 102, said drive shaft 118 is coupled to a drive shaft gear wheel 118a at first end 102a.
6. The rotavator as claimed in claim 1, wherein said rotavator 100 further includes a swivel mechanism, said swivel mechanism includes:
said frame 102 defining a second slider 114b, and
at least one pre-stressed/pretension spring 116 disposed in said second slider 114b,
wherein,
said second shaft 106 is connected to said pre-stressed/pretension spring 116 and mounted in said second slider 114b; and
said second shaft106 is configured to move within a predetermined sliding limit defined by the second slider 114b.
7. The rotavator 100 as claimed in claim 1, wherein said rotavator further includes at least one idler gear 105 disposed between one of said first shaft 104 and said drive shaft 118, and said drive shaft 118 and said second shaft 106.
8. The rotavator 100 as claimed in claim 2 and 3, wherein said first gear wheel 104a and second gear wheel 106a are selected from a group consisting of, equal number of teeth on said first gear wheel 104a and said second gear wheel 106a, more teeth on said first gear wheel 104a compared to said second gear wheel 106a, and more number of teeth on said second gear wheel 106a compared to said first gear wheel 104a.