Title of Invention	' A PUSH BUTTON LIFT CONTROL MECHANISM FOR TRACTORS HAVING MECHANICALLY OPERATED HYDRAULIC CONTROLS'
Abstract	This invention relates to a push button lift control mechanism for tractors having mechanically operated hydraulic controls chaxacterized in that a pump (1) to supply oil to main spool valve (2) of hydraulic lift control unit, a lift push button (3) being pressed so as to cause supply of oil from main spool valve (2) to a cylinder (5) and outward movement of piston (6) thereby causing rotation of a lift arm (7) and lifting of an implement (9) connected to the lift arm by 3-point-lingage (8), a lower push button (4) being pressed for the release of oil from the cylinder (5) to a tank via the main spool valve and inward movement of the piston, which causes lowering of the lift arm and implement.

Title of Invention

' A PUSH BUTTON LIFT CONTROL MECHANISM FOR TRACTORS HAVING MECHANICALLY OPERATED HYDRAULIC CONTROLS'

Abstract

This invention relates to a push button lift control mechanism for tractors having mechanically operated hydraulic controls chaxacterized in that a pump (1) to supply oil to main spool valve (2) of hydraulic lift control unit, a lift push button (3) being pressed so as to cause supply of oil from main spool valve (2) to a cylinder (5) and outward movement of piston (6) thereby causing rotation of a lift arm (7) and lifting of an implement (9) connected to the lift arm by 3-point-lingage (8), a lower push button (4) being pressed for the release of oil from the cylinder (5) to a tank via the main spool valve and inward movement of the piston, which causes lowering of the lift arm and implement.

Full Text	FIELD OF INVENTION This invention relates to a push button lift control mechanism for tractors having mechanically operated hydraulic controls to be used in a lift unit hydraulic control system of an agricultural tractor. The control mechanism can be used for quick lifting and lowering of implement without operating the position or draft control lever. Its main use is during field operation. As soon as headland is reached, it is required to quickly lift the implement before taking a turn and bring back the implement to previous position immediately after turn is completed. Such operations can be easily performed by push button lift control mechanism of the present invention. BACKGROUND OF THE INVENTION (PRIOR ART) Push button type control is commonly available in agricultural tractors having electrohydraulic control systems. But such mechanism is not commonly used in the tractors having mechanically operated hydraulic control systems. The usual practice in all the mechanically operated hydraulic control tractors is to always lift and lower implements either by position or draft control lever. Lifting and lowering of implements by position or draft control lever is not as convenient and comfortable as by operating push buttons. Moreover, there is a chance of drift in depth setting if position or draft control lever are operated frequently and settings are disturbed. OBJECTS OF THE INVENTION An object of this invention is to propose a push button lift control mechanism for tractors having mechanically operated hydraulic controls. Another object of this invention is to propose a push button lift control mechanism for tractors which has a lift push button for lifting of implements and lower push button for lowering of implements. Still another object of this invention is to propose a push button lift control mechanism for tractors, and wherein the actuation of both of these push buttons is independent of position or draft control lever settings. Yet another object of this invention is to propose a push button lift control mechanism for tractors, which enables in quick lifting and lowering of implements. A further object of this invention is to propose a push button lift control mechanism for tractors, which ensures that hydraulic control is brought back to neutral condition automatically after maximum lift height is achieved. A still further object of this invention is to propose a push button lift control mechanism for tractors, which ensures that ploughing depth and achieved is uniform and repeatable. STATEMENT OF THE INVNETION According to this invention there is provided A push button lift control mechanism for tractors having mechanically operated hydraulic controls comprising of a pump to supply oil to main spool valve of hydraulic lift control unit, a lift push button being pressed so as to cause supply of oil from main spool valve to a cylinder and outward movement of piston thereby causing rotation of a lift arm and lifting of an implement connected to the lift arm by 3-point-linkage. a lower push button being pressed for the release of oil from the cylinder to a tank via the main spool valve and inward movement of the piston inside, which causes lowering of the lift arm and implement. BRIEF DESCRIPTION OF THE ACCOMPANYING DRAWING Further objects and advantages of this invention will be more apparent from the ensuing description when read in conjunction with the accompanying drawings and wherein: Figure : 1 shows the circuit diagram of hydraulic lift control unit. Figure : 2 shows the front and side elevation of layout arrangement of push button lift control mechanism. DETAILED DESCRIPTION OF THE INVENTION WITH REFERENCE TO ACCOMPANYING DRAWINGS. Reference may be made to figure:1&5 2. The present invention uses a hydraulic circuit comprising a pump (1) which supplies oil to main spool valve (2) of hydraulic lift control unit. Depending upon actuation of push button either lifting or lowering of implement takes place. If lift push button (3) is pressed, oil from main spool valve (2) flows to a cylinder (5) and its piston (6) moves out. As the piston moves out a lift arm (7) rotates up and implement (9), which is connected to lift arm by three point linkage (8) also lifts up. If lower push button (4) is pressed, oil from cylinder (5) returns to tank via main spool valve (2) and piston (6) moves inside. As the piston moves inside, the lift arm lowers and implement also lowers down due to gravity. For lifting of implement, the lift push button (3) is pressed to cause rotation of a lift actuator (10) and pressing of a pusher rotating plate (12) by a lift actuator roller (11). The plate is fitted on a pusher shaft (24). The rotation of the pusher rotating plate causes the pusher shaft to rotate, thereby causing rotation of a pusher link (15), which is fitted to the other end of pusher shaft. With the rotation of the pusher link, pusher roller (16) attached to the pusher link presses position actuator (17), thereby pressing the main spool valve pin. This results in oil supply to the cylinder and lifting of the implement as explained herein before. As the maximum rotation of "Lift actuator" (10) is achieved the "groove of lift actuator" (26) comes opposite to "Protruded end of Lower Plate" (29) and "Extension Lift actuator" (27) presses the "Lower plate" (13) causing it to rotate with respect to "Lower plate Pin" (30) locking the "Lift actuator" (10). Further pushing of lift push button can not actuate the main spool valve pin. The oil continues to be supplied to cylinder causing lifting of implement till the maximum lift height is achieved. Once the maximum lift height of implement is achieved, the piston that has moved out presses "Slider plate" (21), which slides in "Slider screw" (22). The movement of "Slider plate" (21) is dampened by "Slider spring" (23) and the other end of "Slider plate" (21), which is of circular section, slides in "Slider link" (20). The "Slider link" is connected to "Pusher link" (15). Therefore as the "Slider plate" (21) moves out, it also moves out "Pusher link" (15), causing reverse rotation of "Pusher shaft" (24), "Pusher rotating plate" (12) and "Lift actuator" (10). As the "Lift actuator" (10) rotates in reverse direction, "lower plate Pin" (30) slides in the "Slot plate" (14) and "Lower plate" (13) moves along with "Lower plate pin" (30). It causes "Position actuator" (17) to move away from "Main spool valve pin" (18). As a result, the "Main spool valve pin" (18) moves out, the Oil supply to Cylinder (5) is stopped and hydraulic control system is brought back to neutral condition automatically. The implement continues to remain at the lifted position, unless the "Lower Push button" (4) is pressed. For lowering of implement, the lower push button (4) is pressed, which causes lower push link (32) to press the lower plate (13) causing the rotation of lower plate with respect to lower plate pin (30) and protruded end of lower plate (29) coming out of groove of lift actuator (26), thereby causing movement of position actuator, pusher link, pusher rotating plate, lift actuator and main spool valve pin to their respective original lowered positions and return of oil from cylinder to tank via main spool valve thus facilitating lowering of implement due to gravity. It is to be noted that the present invention is susceptible to modifications, adaptations and changes by those skilled in the art. Such variant embodiments employing the concepts and features of this invention are intended to be within the scope of the present invention, which is further set forth under the following claims:- WE CLAIM; 1. A push button lift control mechanism for tractors having mechanically operated hydraulic controls characterized in that a pump (1) to supply oil to main spool valve (2) of hydraulic lift control unit, a lift push button (3) being pressed so as to cause supply of oil from main spool valve (2) to a cylinder (5) and outward movement of piston (6) thereby causing rotation of a lift arm (7) and lifting of an implement (9) connected to the lift arm by 3-point-lingage (8), a lower push button (4) being pressed for the release of oil from the cylinder (5) to a tank via the main spool valve and inward movement of the piston, which causes lowering of the lift arm and implement, means are provided for lifting of the implement, for limiting the maximum lift stroke of main spool valve pin, for setting hydraulics in the neutral position and for lowering of implement. 2. A push button lift control mechanism as claimed in claim 1, wherein said means are provided for lifting of the implement by pressing the lift push button which causes rotation of a lift actuator (10) and pressing of a pusher rotating plate (12) by lift actuator roller (11), the rotation of said pusher rotating plate causes pushing of position actuator (17) and the main spool valve pin by pusher roller thereby causing supply of oil to cylinder. 3. A push button lift control mechanism as claimed in any of the preceding claims, wherein said means are provided for limiting the maximum lift stroke of main spool valve pin by which as the maximum lift stroke is achieved the groove of lift actuator (26) comes opposite to a protruded end of lower plate (29) and extension lift actuator (27) presses the lower plate (13) causing it to rotate with respect to lower plate pin (30) locking the lift actuator (10). 4. A push button lift control mechanism as claimed in any of the preceding claims, wherein said means are provided for setting hydraulics in the neutral position as the maximum lift height of implement is achieved, which causes pressing of a slider plate (21) with the movement of piston for pulling out of pusher link (15) so as to cause reverse rotation of pusher shaft (24), pusher rotating plate (12) and lift actuator (10) thereby causing position actuator (17) to move away from main spool valve pin (18) and stopping of oil supply to cylinder (5). 5. A push button lift control mechanism as claimed in any of the preceding claims, wherein said means are provided for lowering of implement by pressing the lower push button (4), which causes lower push link (32) to press the lower plate (13) thereby causing movement of position actuator, pusher link, pusher rotating plate, lift actuator and main spool valve pin to their respective original lowered positions and release of oil from cylinder to tank via the main spool valve. 6. A push button lift control mechanism for tractors having mechanically operated hydraulic controls substantially as herein described with reference to the accompanying drawings.

Full Text

FIELD OF INVENTION
This invention relates to a push button lift control mechanism for tractors having mechanically operated hydraulic controls to be used in a lift unit hydraulic control system of an agricultural tractor. The control mechanism can be used for quick lifting and lowering of implement without operating the position or draft control lever. Its main use is during field operation. As soon as headland is reached, it is required to quickly lift the implement before taking a turn and bring back the implement to previous position immediately after turn is completed. Such operations can be easily performed by push button lift control mechanism of the present invention.
BACKGROUND OF THE INVENTION (PRIOR ART)
Push button type control is commonly available in agricultural tractors having electrohydraulic control systems. But such mechanism is not commonly used in the tractors having mechanically operated hydraulic
control systems. The usual practice in all the mechanically operated hydraulic control tractors is to always lift and lower implements either by position or draft control lever. Lifting and lowering of implements by position or draft control lever is not as convenient and comfortable as by operating push buttons. Moreover, there is a chance of drift in depth setting if position or draft control lever are operated frequently and settings are disturbed.
OBJECTS OF THE INVENTION
An object of this invention is to propose a push button lift control mechanism for tractors having mechanically operated hydraulic controls.
Another object of this invention is to propose a push button lift control mechanism for tractors which has a lift push button for lifting of implements and lower push button for lowering of implements.
Still another object of this invention is to propose a push button lift control mechanism for tractors, and wherein the actuation of both of
these push buttons is independent of position or draft control lever settings.
Yet another object of this invention is to propose a push button lift control mechanism for tractors, which enables in quick lifting and lowering of implements.
A further object of this invention is to propose a push button lift control mechanism for tractors, which ensures that hydraulic control is brought back to neutral condition automatically after maximum lift height is achieved.
A still further object of this invention is to propose a push button lift control mechanism for tractors, which ensures that ploughing depth and achieved is uniform and repeatable.
STATEMENT OF THE INVNETION
According to this invention there is provided A push button lift control mechanism for tractors having mechanically operated hydraulic controls
comprising of a pump to supply oil to main spool valve of hydraulic lift control unit, a lift push button being pressed so as to cause supply of oil from main spool valve to a cylinder and outward movement of piston thereby causing rotation of a lift arm and lifting of an implement connected to the lift arm by 3-point-linkage. a lower push button being pressed for the release of oil from the cylinder to a tank via the main spool valve and inward movement of the piston inside, which causes lowering of the lift arm and implement.
BRIEF DESCRIPTION OF THE ACCOMPANYING DRAWING
Further objects and advantages of this invention will be more apparent from the ensuing description when read in conjunction with the accompanying drawings and wherein:
Figure : 1 shows the circuit diagram of hydraulic lift control unit.

Figure : 2 shows the front and side elevation of layout arrangement of push button lift control mechanism.
DETAILED DESCRIPTION OF THE INVENTION WITH REFERENCE TO ACCOMPANYING DRAWINGS.
Reference may be made to figure:1&5 2. The present invention uses a hydraulic circuit comprising a pump (1) which supplies oil to main spool valve (2) of hydraulic lift control unit. Depending upon actuation of push button either lifting or lowering of implement takes place.
If lift push button (3) is pressed, oil from main spool valve (2) flows to a cylinder (5) and its piston (6) moves out. As the piston moves out a lift arm (7) rotates up and implement (9), which is connected to lift arm by three point linkage (8) also lifts up.
If lower push button (4) is pressed, oil from cylinder (5) returns to tank via main spool valve (2) and piston (6) moves inside. As the piston moves inside, the lift arm lowers and implement also lowers down due to gravity.
For lifting of implement, the lift push button (3) is pressed to cause rotation of a lift actuator (10) and pressing of a pusher rotating plate (12) by a lift actuator roller (11). The plate is fitted on a pusher shaft (24). The rotation of the pusher rotating plate causes the pusher shaft to rotate, thereby causing rotation of a pusher link (15), which is fitted to the other end of pusher shaft. With the rotation of the pusher link, pusher roller (16) attached to the pusher link presses position actuator (17), thereby pressing the main spool valve pin. This results in oil supply to the cylinder and lifting of the implement as explained herein before.
As the maximum rotation of "Lift actuator" (10) is achieved the "groove of lift actuator" (26) comes opposite to "Protruded end of Lower Plate" (29) and "Extension Lift actuator" (27) presses the "Lower plate" (13) causing it to rotate with respect to "Lower plate Pin" (30) locking the "Lift
actuator" (10).
Further pushing of lift push button can not actuate the main spool valve pin. The oil continues to be supplied to cylinder causing lifting of implement till the maximum lift height is achieved.
Once the maximum lift height of implement is achieved, the piston that has moved out presses "Slider plate" (21), which slides in "Slider screw" (22). The movement of "Slider plate" (21) is dampened by "Slider spring" (23) and the other end of "Slider plate" (21), which is of circular section, slides in "Slider link" (20). The "Slider link" is connected to "Pusher link" (15). Therefore as the "Slider plate" (21) moves out, it also moves out "Pusher link" (15), causing reverse rotation of "Pusher shaft" (24), "Pusher rotating plate" (12) and "Lift actuator" (10). As the "Lift actuator" (10) rotates in reverse direction, "lower plate Pin" (30) slides in the "Slot plate" (14) and "Lower plate" (13) moves along with "Lower plate pin" (30). It causes "Position actuator" (17) to move away from "Main spool valve pin" (18). As a result, the "Main spool valve pin" (18) moves out, the Oil supply to Cylinder (5) is stopped and hydraulic control system is brought back to neutral condition automatically. The implement continues to
remain at the lifted position, unless the "Lower Push button" (4) is pressed.
For lowering of implement, the lower push button (4) is pressed, which causes lower push link (32) to press the lower plate (13) causing the rotation of lower plate with respect to lower plate pin (30) and protruded end of lower plate (29) coming out of groove of lift actuator (26), thereby causing movement of position actuator, pusher link, pusher rotating plate, lift actuator and main spool valve pin to their respective original lowered positions and return of oil from cylinder to tank via main spool valve thus facilitating lowering of implement due to gravity.
It is to be noted that the present invention is susceptible to modifications, adaptations and changes by those skilled in the art. Such variant embodiments employing the concepts and features of this invention are intended to be within the scope of the present invention, which is further set forth under the following claims:-

WE CLAIM;
1. A push button lift control mechanism for tractors having mechanically operated hydraulic controls characterized in that a pump (1) to supply oil to main spool valve (2) of hydraulic lift control unit, a lift push button (3) being pressed so as to cause supply of oil from main spool valve (2) to a cylinder (5) and outward movement of piston (6) thereby causing rotation of a lift arm (7) and lifting of an implement (9) connected to the lift arm by 3-point-lingage (8), a lower push button (4) being pressed for the release of oil from the cylinder (5) to a tank via the main spool valve and inward movement of the piston, which causes lowering of the lift arm and implement, means are provided for lifting of the implement, for limiting the maximum lift stroke of main spool valve pin, for setting hydraulics in the neutral position and for lowering of implement.
2. A push button lift control mechanism as claimed in claim 1, wherein said means are provided for lifting of the implement by pressing the lift push button which causes rotation of a lift actuator (10) and pressing of a pusher rotating plate (12) by lift actuator roller (11), the rotation of said pusher rotating plate causes pushing of position actuator (17) and the main spool valve pin by pusher roller thereby causing supply of oil to cylinder.
3. A push button lift control mechanism as claimed in any of the preceding claims, wherein said means are provided for limiting the maximum lift stroke of main spool valve pin by which as the maximum lift stroke is achieved the groove of lift actuator (26) comes opposite to a protruded end of lower plate (29) and extension lift actuator (27) presses the lower plate (13) causing it to rotate with respect to lower plate pin (30) locking the lift actuator (10).
4. A push button lift control mechanism as claimed in any of the preceding claims, wherein said means are provided for setting hydraulics in the neutral position as the maximum lift height of implement is achieved, which causes pressing of a slider plate (21) with the movement of piston for pulling out of pusher link (15) so as to cause reverse rotation of pusher shaft (24), pusher rotating plate (12) and lift actuator (10) thereby causing position actuator (17) to move away from main spool valve pin (18) and stopping of oil supply to cylinder (5).
5. A push button lift control mechanism as claimed in any of the preceding claims, wherein said means are provided for lowering of implement by pressing the lower push button (4), which causes lower push link (32) to press the lower plate (13) thereby causing movement of position actuator, pusher link, pusher rotating plate, lift actuator and main spool valve pin to their respective original lowered positions and release of oil from cylinder to tank via the main spool valve.
6. A push button lift control mechanism for tractors having mechanically operated hydraulic controls substantially as herein described with reference to the accompanying drawings.

Documents:

145-DEL-2005-Abstract-(01-05-2009).pdf

145-del-2005-abstract.pdf

145-DEL-2005-Claims-(01-05-2009).pdf

145-DEL-2005-Claims-Others-(01-06-2010).pdf

145-del-2005-claims.pdf

145-DEL-2005-Correspondence-Others (13-01-2010).pdf

145-DEL-2005-Correspondence-Others-(01-05-2009).pdf

145-DEL-2005-Correspondence-Others-(01-06-2010).pdf

145-DEL-2005-Correspondence-Others-(07-05-2010).pdf

145-del-2005-correspondence-others.pdf

145-del-2005-correspondence-po.pdf

145-del-2005-description (complete).pdf

145-del-2005-description (provisional).pdf

145-del-2005-drawings.pdf

145-DEL-2005-Form-1-(01-05-2009).pdf

145-del-2005-form-1.pdf

145-del-2005-form-18.pdf

145-DEL-2005-Form-2-(01-05-2009).pdf

145-del-2005-form-2.pdf

145-DEL-2005-Form-3-(01-05-2009).pdf

145-del-2005-form-5.pdf

145-del-2005-form-9.pdf

145-DEL-2005-GPA-(01-05-2009).pdf

145-DEL-2005-GPA-(01-06-2010).pdf

145-del-2005-gpa.pdf

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Patent Number

241280

Indian Patent Application Number

145/DEL/2005

PG Journal Number

27/2010

Publication Date

02-Jul-2010

Grant Date

25-Jun-2010

Date of Filing

24-Jan-2005

Name of Patentee

PUNJAB TRACTORS LIMITED

Applicant Address

INDUSTRIAL AREA PHASE IV,S.A.S.NAGAR,DISTRICT ROPAR-160 055 (NEAR CHANDIGARH),INDIA

Inventors:

#	Inventor's Name	Inventor's Address
1	RAM KUMAR MANRAO	INDUSTRIAL AREA PHASE IV,S.A.S.NAGAR,DISTRICT ROPAR-160 055 (NEAR CHANDIGARH),INDIA
2	JATINDER SINGH CHAWLA	INDUSTRIAL AREA PHASE IV,S.A.S.NAGAR,DISTRICT ROPAR-160 055 (NEAR CHANDIGARH),INDIA
3	ATUL CHANDRA TRIPATHI	INDUSTRIAL AREA PHASE IV,S.A.S.NAGAR,DISTRICT ROPAR-160 055 (NEAR CHANDIGARH),INDIA

PCT International Classification Number

F16K 03/18

PCT International Application Number

N/A

PCT International Filing date

PCT Conventions:

#	PCT Application Number	Date of Convention	Priority Country
1			NA