DESC:FIELD OF INVENTION

The present invention relates to a mechanical hitch system for agricultural Tractors. In particular, the present invention relates to a hitch system having an additional mechanical control arrangement mounted at rear end of tractor for adjusting the height of lower links from ground level. More particularly, the additional mechanical control arrangement has hand operated telescopic lever for accurately matching the hitch-point of an implement while standing at rear end of tractor.

BACKGROUND OF THE INVENTION

In the existing configurations of three-point linkage mechanism of agricultural tractors, the operator brings the rear end of the tractor in front of the implement for hitching (Figure 2). The operator needs to move a number of times from his seat to the rear end to adjust the lower link height by using the conventional control levers placed near the driver seat for hitching the agricultural implements (Figure 1).

Another way to do this task requires at least two persons, one to control the height of the lower link by using a position lever from driver seat and another to hitch the implement to the tractor while standing at rear end of tractor.

This phenomenon was observed at actual field operation and it was confirmed that while hitching an implement to the tractor, the operator had to move several times from the tractor seat to its rear end and vice versa for adjusting the height of the lower-link to hitch the implement (Figure 2).

The available solution to the problem is the tractors with electro-hydraulic hitch system. A pair of push button switch is mounted on rear end of tractor mud guard to lift or lower the lower links and align with implement to be attached. Study of the available technology revealed several limitations: for example, the system is costly, the servicing is complex and most importantly, it can be used only with an electronic controlled hitch control valve and moreover, the technology cannot be retrofitted on existing setup.

DISADVANTAGES WITH THE PRIOR ART

There are many disadvantages while carrying out hitching of the agricultural implements by using conventional control levers normally provided on agricultural tractors to operate three-point linkage mechanism. These are discussed in the following:

• The conventional hitching systems for agricultural tractors involve undesirable operator movements.

• Often, another person is required to assist the tractor operator while hitching an agricultural implement.

• Conventional hitching systems require higher manpower and cause wastage of time and energy.

• Using the conventional hitching system leads to wastage of operator’s efforts by repeated to-and-fro movement of the operator to align tractor lift position with respect to implement to be hitched.

• In the conventional hitching system, sometimes it is very difficult for a single operator to attach heavy implements.

It is necessary to save such undesirable operator movements and to save the wasteful efforts and time of the operator and his attendants by obviating the disadvantages associated with the conventional hitching systems.

Therefore, there is a need for a system for agricultural tractors, by which even a single operator can align and hitch the implement very easily.

OBJECTS OF THE INVENTION

Some of the objects of the present invention - satisfied by at least one embodiment of the present invention - are as follows:

An object of the present invention is to provide an easily operable mechanical hitching system for agricultural tractors.

Another object of the present invention is to provide a mechanical hitching system for agricultural tractors, which significantly reduces frequent movements by the tractor operator.

Still another object of the present invention is to provide a mechanical hitching system for agricultural tractors, which can be operated by the tractor operator single-handedly.

Yet another object of the present invention is to provide a mechanical hitching system for agricultural tractors, which saves tractor operator’s time.

Still another object of invention is to have adjustable/telescopic rear lever and a linkage configuration for ease of handling to restrict the operating range of rear position lever.

A further object of the present invention is to provide a mechanical hitching system for agricultural tractors, which is configured as an easy hitch system.

A still further object of the present invention is to provide a mechanical hitching system for agricultural tractors, which is easy for the operator in field for lifting of the lower links.

A yet further object of the present invention is to provide a mechanical hitching system for agricultural tractors, which restricts and optimizes the operating range of rear position lever.

A yet further object of the present invention is to provide a mechanical hitching system for agricultural tractors, which does not cause discomfort/hindrance to the co-passenger sitting on mudguard/fender

These and other objects and advantages of the present invention will become more apparent from the following description, when read with the accompanying figures of drawing, which are however not intended to limit the scope of the present invention in any way.

SUMMARY OF THE INVENTION

In accordance with the present invention, there is provided a mechanical detachable hitch system for agricultural tractors, which comprises:

• a telescopic rear operating lever assembly consisting of a tube assembly;
• a tie rod configured with tie rod pins mounted on the side facing of the position lever;
• a mounting bracket connected to the telescopic rear operating lever to the brake housing;
• a hydraulic control sector operated by a position lever with a grip and rotatable about a control lever axis; and
• an idler plate hanger with a hole provided therein;

wherein the telescopic rear operating lever is configured extensible or collapsible for mechanically adjusting the lower-link height or hitch point from the rear end of the tractor.

Typically, the telescopic rear operating lever comprises:

- an inner extension rod with an inner end and an outer end;

- a tube assembly with an outer end and a hinge-point hub configured at the rear end thereof;

wherein the inner extension rod is secured at the inner end thereof with the outer end of a tube assembly via a threaded connection and the inner extension rod adapted to be moveable within the tube assembly from its extended position to facilitate easy hitching of any agricultural implement to a collapsed position to avoid any hindrance to the person sitting on the fender or tractor’s mud guard.

Typically, the tube assembly is configured with a nestled doll type of hinge-point hub at the rear end thereof.

Typically, the rear telescopic lever is linked via tie rod to the position lever of the hydraulic control sector by means of a tie-rod pin used for engaging or disengaging the tie rod.

Typically, the position Lever is brought at its lower-most position and the rear operating lever is brought in the extended position thereof for hitching a big agricultural implement to the tractor.

Typically, the inner extension rod is locked at the most extended position or collapsed position thereof by means of the internal threads provided at both ends of the tube assembly.

Typically, an idler plate hanger is provide to detach the linkage, if desired, by connecting the tie-rod pin of position sector end to the idler plate hanger.

Typically, the rear telescopic lever comprises nested doll configuration and includes an inner extension rod with a threaded portion at one end thereof for attaching a grip thereon and with another threaded portion at the other end thereof to be threaded into a hinge-point hub; and the inner extension rod adapted to be assembled into the tube assembly; the tube being fitted with another bush with internal threads on the other side thereof; the bushes configured with threads for locking of inner extension rod in the extended portion and collapsed position thereof respectively.

Typically, the thread lengths are configured unequal with the shorter thread length provided on the lower side for locking the inner extension rod and with the longer thread length provided on the upper side for secure attachment of the inner extension rod into the tube of the tube assembly.

Typically, a protective metal cup is welded on the inner extension rod adjacent the upper end thereof for preventing ingress of water and dust into the tube assembly.

Typically, a hole of 2 to 5 mm, preferably 3 mm diameter is configured at the base of the tube assembly to drain out water present inside the tube.

Typically, the operating range of movement of rear position lever is restricted and optimized in the rage of 35 to 900, preferably 650 to avoid any discomfort and/or hindrance to co-passenger sitting on the tractor mud guard or fender.

Typically, the range of movement of the rear position lever is restricted and optimized to lift lower links at the height ranging from 250 to 600 mm from ground, preferably 450 mm, by considering implement hitching height from ground.

DESCRIPTION OF THE INVENTION

A possible method for solving the problem faced by the existing mechanical hitching system for agricultural tractors is by providing a mechanism to adjust the height of the lower link from the rear end of the tractor. In the mechanical hitching system for agricultural tractors accordance with the present invention, (called as easy hitch system) the lower link height is adjusted by moving a hydraulic position lever.

For this purpose, an additional lever is provided at the rear end of the tractor. This rear lever is linked to the position lever of the hydraulic control sector by a tie-rod. While hitching an agricultural implement with the tractor, the rear lever is operated which in turn operates the position lever at the control sector. Eventually, the lower link of the three point linkage is lifted or lowered.

Since the lower link hitch point height can be adjusted based on implement hitch pin height for hitching an implement, the easy hitch rear lever enables the tractor operator to hitch the implement with great ease just by adjusting the height of the lower link hitch point directly from the rear end. Since the rear lever is connected to the position lever, the rear lever will always move while operating the position lever from the operator’s seat.

A long rear lever may interfere with the legs of the person seating on the fender (Mud Guard), so lever length should also be kept to bare minimum. But short lever length again creates problem, while hitching big implement, particularly when the space between the tractor and the implement is limited. So, the rear lever is made telescopic with threads at both ends. These threads at both ends of the telescopic rear lever enable the tractor operator to lock the inner extension rod at both positions as per requirement.

An idler hanger plate is also provided on the control sector as a provision to detach easy hitch mechanism. When easy hitch mechanism in accordance with the present invention is active, the tie-rod is connected to the rear operating lever and an extended plate of the position lever. This extended plate is a part of the position lever of the control sector and is provided to the crank.

Whenever the tractor operator wants to detach this novel easy hitch mechanism, the tie-rod pin can be detached from the position lever (from its extended plate) and pinned into the hole of the idler plate hanger. This disengages the rear operating lever from the position lever, and keeps it independent. Hence there will not be any movement of rear lever even if position lever is being operated.

Therefore, the invention relates to a hitch system having an additional mechanical control arrangement at rear end of tractor for adjusting the position of lower links. The arrangement is having telescopic lever in addition to position lever for accurately matching the hitch-point of an implement from rear end of tractor and a provision to detach the linkage if required.

BRIEF DESCRIPTION OF THE ACCOMPANYING DRAWINGS

The present invention will be briefly described with reference to the accompanying drawings, wherein the mechanical hitching system for agricultural tractors in accordance with the present invention is represented in details.

Figure 1 shows a tractor operator controlling the position lever after bringing the tractor’s rear end in front of the agricultural implement to be hitched thereto in a conventional manner.

Figure 2 shows the tractor operator manually adjusting or positioning the height of lower links for hitching the implement in a conventional manner.

Figure 3 shows a side view of the easy hitch linkage configured in accordance with the present invention, for mechanically making lower link height or hitch point adjustment from the rear end of the tractor.

Figure 4 shows a rear view of the easy hitch linkage arrangement configured in accordance with the present invention, for mechanically making lower link height or hitch point adjustment from the rear end of the tractor.

Figure 5 shows the retracted or collapsed telescopic rear operating lever and working of the easy hitch arrangement configured in accordance with the present invention.

Figure 6 shows the easy hitch arrangement configured in accordance with the present invention, with the Position Lever at lower position and rear operating lever in the extended condition thereof.

Figure 7 shows the easy hitch arrangement configured in accordance with the present invention, with the position Lever is at up position with rear operating lever is in its extended condition.

Figure 8 shows detailed cross-sectional view of the construction of the rear telescopic Lever of the easy hitch arrangement configured in accordance with the present invention.

Figure 9 shows the detailed perspective view of the easy hitch arrangement configured in accordance with the present invention, with the detachable linkage for linking the rear telescopic lever via tie rod to the idler hanger plate in accordance with the present invention.

Figure 10 shows the best known conventional solution for a method for easy hitching of the implement to tractor by means of toggle switches.

DETAILED DESCRIPTION OF THE ACCOMPANYING DRAWINGS

Figure 1 shows an operator (Op) of the tractor (Tr) while controlling the position lever (2) by using the conventional three-point linkage mechanism in agricultural tractors.

For doing this, the tractor operator (Op) has to move several times from driver’s seat to the rear end (4) (Figure 2) in order to adjust the height of the lower-link or Hitch-point by using the control levers (2) provided for controlling the position of lower links of the tractor (Tr).

Figure 2 shows the conventional three-point linkage mechanism provided in agricultural tractors. Here, the operator (Op) brings the rear end (4) of the tractor in front of implement (6) to be hitched to the tractor (Tr). The tractor operator is required to manually adjust or position the height of lower links thereof for hitching the implement (6). For doing this, the tractor operator (Op) has to move several times from driver’s seat to the rear end (4) in order to adjust the height of the lower-link or Hitch-point by using the control lever (2) provided near the driver’s seat for controlling the position of lower links of the tractor (Tr).

Figure 3 shows the right hand side view of the easy hitch arrangement configured in accordance with the present invention for an agricultural tractor, particularly illustrating the extended extension rod (102) of the telescopic rear operating lever (100) for mechanically adjusting the lower-link height or hitch point from the rear end of the tractor (4). The telescopic rear operating lever (100) consists of an inner extension rod (102) with a grip (102a) at its outer end. The inner extension rod (102) is secured at the inner end (102b) thereof with the outer end (104a) of a tube assembly (104) by a threaded connection. The tube assembly (104) is also provided with a hinge-point hub (103) provided at the rear end (104b) thereof. The hinge-point hub (103) is of a nested doll configuration, wherein the inner extension rod (102) is assembled into the tube of the tube assembly (104). A tie rod (106) with a tie rod pin (106a), a mounting bracket (108), a brake housing (110), a hydraulic control sector (112) and a position lever (114) having a grip (114a) and an extended plate (114b) and control lever axis (118) are also seen here.

Figure 4 shows a detailed enlarged view from the driver’s seat to the rear of the retracted or collapsed inner extension rod (102) of the telescopic rear operating lever (100). Here, the telescopic rear operating lever (100) is linked to the position lever (114) of the hydraulic control sector (112) by means of a tie-rod (106). The tie rod pin (106a) can be engaged into hole 120 provided in idler plate hanger (120). The mounting bracket (108) connected to the brake housing (110) at one end and to the telescopic rear operating lever (100) to which the rod (106) is also connected at the other end thereof are also clearly visible.

Figure 5 shows the position Lever (114) at its lower-most position L and the rear operating lever (100) is shown with its collapsed or retracted position of the inner extension rod (102) and illustrates the working of the easy hitch system in accordance with the invention. This configuration is conceived to avoid any interference of long rear telescopic lever (100) with the legs of the person sitting on the fender or Mud-guard (116) during adjustment of the hitch point of the lower links. This is achieved by reducing the length to a bare minimum. This position is also used when implement (6) is not hitched to the tractor.

Figure 6 shows the position Lever (114) again at its lower-most position L and the rear operating lever (100) with extended position of the inner extension rod (102). This position is used, when a big implement (6) needs to be hitched. Since the space between the tractor and the implement (6) is less in this case, the operator needs to lock the inner extension rod (102) at its most extended position (seen here). As already explained above, the threads provided at both ends of the tube assembly (104) are used to lock the rear operating lever (100) at extended position (100a) here or collapsed position (100b) in Figure 7. The flexibility to adjust the length of rear operating lever (100) is provided for ease of operator to handle the lever as per requirement and convenience without operator (Op) getting in between the tractor (Tr) and implement (6).

Figure 7 shows the position Lever (114) now at its higher-most position H with the rear operating lever (100) with its inner extension rod (102) in an extended position to facilitate easy hitching of the implement (6). While shifting the rear operating lever (100) from low position (100a) shown in Figure 6 to the high position (100b), the position lever (114) travels all across the control sector (112).

Accordingly, this leads to lower link movement for adjusting its height by means of the link pin height or hitch height of the implement (6) for hitching the implement to the tractor. Once implement (6) is hitched to the tractor, this rear telescopic operating lever (100) can again be collapsed to avoid any hindrance to the person sitting on the fender or Mud Guard (116) by bringing the extension rod (102) to its most retracted position (Figure 5).

Figure 8 shows detailed construction of the rear telescopic lever (100) of a nested doll configuration. It includes an inner extension rod (102) with a threaded portion (102t) at one end thereof for attaching a grip (on the right side in this Figure). It includes another threaded portion (102T) at the other end thereof (on the left side in this Figure) for threading it into the internal threads of bush (104c) welded to a hinge-point hub (104d). The inner extension rod (102) is assembled inside the tube in the tube assembly (104). The tube is also fitted with another bush (104c) with internal threads (of same pitch but of unequal length) on the other side thereof. Threads are provided on both sides of tube bushes (104c) for locking of inner extension rod (102) in its extended (Figures 6, 7) and collapsed (Figure 5) position respectively. Thread Lengths are kept unequal intentionally, i.e. the shorter thread length on the lower side (left side in Figure 8) is provided just to lock the inner extension rod (102), whereas the upper thread length (right side in Figure 8) is kept longer to prevent the inner extension rod (102) from easily coming off out from the tube (104). A protective metal cup (105) is also welded on the inner extension rod (102) adjacent the upper end thereof to prevent entry of water and dust into the tube assembly (104). A hole (107) of 3 mm diameter is provided at the base of the tube assembly (104) to drain out any water that could have still entered into it.

Figure 9 shows the detailed view of the detachable linkage in accordance with the present invention for linking the rear telescopic lever (100) via tie rod (106) to the position lever (114). Accordingly, when the easy hitch mechanism is active, the tie-rod (106) is connected to the rear telescopic operating lever (100) and an extended plate (114b) of position lever (114). This extended plate (114b) is a part of the position lever (114) of the control sector (112) and is provided to crank. Whenever, the tractor operator wants to detach this easy hitch mechanism, the tie-rod pin (106a) needs to be detached from hole (114c) of the extended plate (114b) of the position lever (114) and pinned into hole (126) of the idler plate hanger (120). This action disengages the rear telescopic operating lever (100) from the position lever (114), and it remains independent and inactive.

Figure 10 shows the best known conventional solution for a method for easy hitching of the implement to tractor by means of toggle switches (5) provided at the rear end (4) of the tractor on the mud guard (8). But this method has few limitations such as – the servicing is complex, it is expensive and most importantly it can only be used with electronic controlled hitch control valve for three-point linkage.

Therefore, the present invention as explained with reference to Figures 3 to 9 offers an easier, cost-effective and purely mechanical solution to attach or detach an agricultural implement, however, without the operator requiring any assistance of another person as already discussed with reference to the existing hitching systems.

The operating range of movement of rear position lever is restricted and optimized between 35 to 90 degrees, preferably 65 degrees, to avoid discomfort/hindrance to co-passenger sitting on mud guard/fender. to lift lower links at the height ranging from 250 to 600 mm from ground, preferably 450 mm, considering implement hitching height from ground.

WORKING OF THE INVENTION:

The additional mechanical linkage as explained above in accordance to the present invention, facilitates the operator (Op) to adjust lower link height from the ground from rear end (4) of the tractor (Tr). The telescopic design of lever provides flexibility to operator (Op) to adjust length of rear operating lever (100) as per the requirement and his convenience. The present invention eliminates the undesired movement of operator and saves operator’s time. According to the present invention, when the mechanical easy hitch mechanism is active, the tie-rod (106) is connected to the rear telescopic operating lever (100) and an extended plate (114b) of position lever (114). Whenever, the tractor operator wants to detach this easy hitch mechanism, the tie-rod pin (106a) needs to be detached from hole (114c) of the position lever (114) from its extended plate (114b) and pinned into hole (126) of the idler plate hanger (120). This action disengages the rear telescopic operating lever (100) from the position lever (114), and it remains independent.

The direction of rear lever operating and direction of lower link movements are maintained same for ease of understanding for the operator, so that for lifting the lower links, the rear position lever needs to be raised.

TECHNICAL ADVANTAGES AND ECONOMIC SIGNIFICANCE

The mechanical easy hitch mechanism in accordance with the present invention has the following advantages:

1. Actuating rear end lever for lifting and lowering lower link.

2. Telescopic type lever for easy adjustment as per requirement.

3. Detachable linkage for this mechanism for idle condition.

4. Linkage configuration to restrict operating range of rear position lever.

5. No expensive electronic circuitry / toggle switch is required.

6. No frequent movement of the operator to the rear end of the tractor to attach or detach the agricultural implement.

7. No assistance needed for the operator to hitch the desired agricultural implement.

8. Offers ease of operation and optimized to lift lower links for raising the rear position lever.

9. Offers restricted and optimized operating range of rear position lever for achieving full height of lower link for hitching of implement.

10. Facilitates a controlled rear lever movement to prevent any discomfort or hindrance to the co-passenger sitting on mudguard/fender.

Throughout this specification the word “comprise”, or variations such as “comprises” or “comprising”, shall be understood to implies including a described element, integer or method step, or group of elements, integers or method steps. However, it does not imply excluding any other element, integer or step, or group of elements, integers or method steps. In the claims and the description, the terms “containing” and “having” are used as linguistically neutral terminologies for the corresponding terms “comprising”.

The use of the expression “a”, “at least” or “at least one” shall imply using one or more elements or ingredients or quantities, as used in the embodiment of the disclosure in order to achieve one or more of the intended objects or results of the present invention. Furthermore, the use of the term “one” shall not exclude the plurality of such features and components described.

The description provided herein is purely by way of example and illustration. The various features and advantageous details are explained with reference to this non-limiting embodiment in the above description in accordance with the present invention.

The descriptions of well-known components and manufacturing and processing techniques are consciously omitted in this specification, so as not to unnecessarily obscure the specification. In the previously detailed description, different features have been summarized for improving the conclusiveness of the representation in one or more examples.

However, it should be understood that the above description is merely illustrative, but not limiting under any circumstances. It helps in covering all alternatives, modifications and equivalents of the different features and exemplary embodiments.

Many other examples are directly and immediately clear to the skilled person because of his/her professional knowledge in view of the above description.

Therefore, innumerable changes, variations, modifications, alterations may be made and/or integrations in terms of materials and method used may be devised to configure, manufacture and assemble various constituents, components, subassemblies and assemblies according to their size, shapes, orientations and interrelationships.

While considerable emphasis has been placed on the specific features of the preferred embodiment described here, it will be appreciated that many additional features can be added and that many changes can be made in the preferred embodiments without departing from the principles of the invention.

These and other changes in the preferred embodiment of the invention will be apparent to those skilled in the art from the disclosure herein, whereby it is to be distinctly understood that the foregoing descriptive matter is to be interpreted merely as illustrative of the invention and not as a limitation.

The exemplary embodiments were selected and described in order to be able to best represent the principles and their possible practical application underlying the invention. Thereby, the skilled persons can optimally modify and use the invention and its different exemplary embodiments with reference to the intended use.

LIST OF REFERENCE NUMERALS
Operator Op
Tractor Tr
Position lever 2
Tractor rear end 4
Agricultural implement 6
Telescopic rear operating lever 100
Extended position of the rear operating lever 100a
Collapsed position of the rear operating lever 100b
Inner extension rod 102
Extension rod grip 102a
Extension rod inner end 102b
Hinge-point hub 103
Tube assembly 104
Outer end of tube assembly 104a
Rear end of tube assembly 104b
Bush with internal threads 104c
Hinge-point hub (nestled) 104d
Tie rod 106
Tie rod pin 106a
Hole in tube assembly 107
Mounting bracket 108
Brake housing 110
Hydraulic control sector 112
Position lever 114
Position lever grip 114a
Position lever extended plate 114b
Tractor fender or Mud-guard 116
Control lever axis 118
Idler plate hanger 120
Hole in idler plate hanger 126 ,CLAIMS:We claim:

1. A mechanical detachable hitch system for agricultural Tractors, the hitch system comprises:

• a telescopic rear operating lever assembly consisting of a tube assembly;
• a tie rod configured with tie rod pins mounted on the side facing the position lever;
• a mounting bracket connected to the telescopic rear operating lever to the brake housing;
• a hydraulic control sector operated by a position lever with a grip and rotatable about a control lever axis; and
• an idler plate hanger with a hole provided therein;

wherein the telescopic rear operating lever is configured extensible or collapsible for mechanically adjusting the lower-link height or hitch point from the rear end of the tractor.

2. Mechanical detachable hitch system as claimed in claim 1, wherein the telescopic rear operating lever comprises:

- an inner extension rod with an inner end and an outer end;

- a tube assembly with an outer end and a hinge-point hub configured at the rear end thereof;

wherein the inner extension rod is secured at the inner end thereof with the outer end of a tube assembly via a threaded connection and the inner extension rod adapted to be moveable within the tube assembly from its extended position to facilitate easy hitching of any agricultural implement to a collapsed position to avoid any hindrance to the person sitting on the fender or tractor’s mud guard.

3. Mechanical detachable hitch system as claimed in claim 2, wherein the tube assembly is configured with a nestled doll type of hinge-point hub at the rear end thereof.

4. Mechanical detachable hitch system as claimed in claim 3, wherein the rear telescopic lever is linked via tie rod to the position lever of the hydraulic control sector by means of a tie-rod pin used for engaging or disengaging the tie rod.

5. Mechanical detachable hitch system as claimed in claim 4, wherein the position Lever is brought at its lower-most position and the rear operating lever is brought in the extended position thereof for hitching a big agricultural implement to the tractor.

6. Mechanical detachable hitch system as claimed in claim 5, wherein the inner extension rod is locked at the most extended position or collapsed position thereof by means of the internal threads provided at both ends of the tube assembly.

7. Mechanical detachable hitch system as claimed in claim 1, wherein an idler plate hanger is provide to detach the linkage, if desired, by connecting the tie-rod pin of position sector end to the idler plate hanger.

8. Mechanical detachable hitch system as claimed in claim 1, wherein the rear telescopic lever comprises nested doll configuration and includes an inner extension rod with a threaded portion at one end thereof for attaching a grip thereon and with another threaded portion at the other end thereof to be threaded into a hinge-point hub; and the inner extension rod adapted to be assembled into the tube assembly; the tube being fitted with another bush with internal threads on the other side thereof; the bushes configured with threads for locking of inner extension rod in the extended portion and collapsed position thereof respectively.

9. Mechanical detachable hitch system as claimed in claim 8, wherein the thread lengths are configured unequal with the shorter thread length provided on the lower side for locking the inner extension rod and with the longer thread length provided on the upper side for secure attachment of the inner extension rod into the tube of the tube assembly.

10. Mechanical detachable hitch system as claimed in claims 8 and 9, wherein a protective metal cup is welded on the inner extension rod adjacent the upper end thereof for preventing ingress of water and dust into the tube assembly.

11. Mechanical detachable hitch system as claimed in anyone of the claims 8 to 10, wherein a hole of 2 to 5 mm, preferably 3 mm diameter is configured at the base of the tube assembly to drain out water present inside the tube.

12. Mechanical detachable hitch system as claimed in anyone of the claims 1 to 11, wherein the operating range of movement of rear position lever is restricted and optimized in the rage of 35 to 900, preferably 650 to avoid any discomfort and/or hindrance to co-passenger sitting on the tractor mud guard or fender.

13. Mechanical detachable hitch system as claimed in anyone of the claims 1 to 12, wherein the range of movement of the rear position lever is restricted and optimized to lift lower links at the height ranging from 250 to 600 mm from ground, preferably 450 mm, by considering implement hitching height from ground.

Dated: this day of 31st March, 2015. SANJAY KESHARWANI
APPLICANT’S PATENT AGENT