CA2045731A1 - Safety circuit for the drive motor of a tractor - Google Patents
Safety circuit for the drive motor of a tractorInfo
- Publication number
- CA2045731A1 CA2045731A1 CA 2045731 CA2045731A CA2045731A1 CA 2045731 A1 CA2045731 A1 CA 2045731A1 CA 2045731 CA2045731 CA 2045731 CA 2045731 A CA2045731 A CA 2045731A CA 2045731 A1 CA2045731 A1 CA 2045731A1
- Authority
- CA
- Canada
- Prior art keywords
- switch
- operator
- seat
- tractor
- condition
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
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- Auxiliary Drives, Propulsion Controls, And Safety Devices (AREA)
Abstract
SAFETY CIRCUIT FOR THE DRIVE MOTOR OF A TRACTOR
ABSTRACT OF THE DISCLOSURE
A safety circuit for a tractor and implement combination includes a first switch responsive to movement of a lever actuating the implement to an inoperative position and a second switch responsive to movement of a lever actuating the drive transmission to the tractor to a neutral position together with a seat switch responsive to the presence of the operator in the seat of the cab. The safety circuit allows the operator to start the machine only when the transmission is in neutral and the implement is decoupled. After the engine is started and running, the circuit prevents the operator from leaving the seat while the implement is engaged or the transmission is not in neutral. A timer is coupled to the seat switch circuit to allow temporary movement of the operator from the seat. A bypass switch on the implement drive allows the operator to leave the cab to observe the implement operating.
ABSTRACT OF THE DISCLOSURE
A safety circuit for a tractor and implement combination includes a first switch responsive to movement of a lever actuating the implement to an inoperative position and a second switch responsive to movement of a lever actuating the drive transmission to the tractor to a neutral position together with a seat switch responsive to the presence of the operator in the seat of the cab. The safety circuit allows the operator to start the machine only when the transmission is in neutral and the implement is decoupled. After the engine is started and running, the circuit prevents the operator from leaving the seat while the implement is engaged or the transmission is not in neutral. A timer is coupled to the seat switch circuit to allow temporary movement of the operator from the seat. A bypass switch on the implement drive allows the operator to leave the cab to observe the implement operating.
Description
- 204~731 SAFETY CIRC~IT FOR THE DRIVE MOTOR OF A TRACTOR
BACKGROUND OF THE INVENTION
This invention relates to a safety circuit for controlling the drive motor of a tractor and implement combination.
A tractor and implement combination for example a swather or a mower includes a drive motor and a transmission system for transmitting drive power from the motor to drlve the tractor and to drive the implement. Safety circuits are often provided in an arrangement of this type for example which prevent operation of the starter motor to start the engine when the implement drive system is engaged. Seat switches are also known which can operate to stop the engine if the operator leaves the seat for any reason.
SUMMARY OF THE INVENTION
It is an object of the present invention to provide an improved safety circuit arrangement for a tractor and implement combination.
According to the invention, therefore, there is provided a tractor for moving and driving an agricultural implement comprising a tractor body, an implement, means 204~731 connecting the implement to the tractor body for transportation with the tractor body in movement across the ground, first drive means for driving operation of the implement, manually movable first operator means movable from the first deactivated position to a second position actuating said first dcive means, second drive means for driving movement of said tractor body across the ground, manually movable second operator means movable from first deactivated position to a second position actuating said second drive means, drive motor means for developing power for transmission to said first and second drive means, an electrically operated starter motor for commencing operation of said drive motor means, an electrically operated control system for allowing commencement and continuation of operation of said drive motor means, seat mounted on the tractor body for an operator such that said flrst and second operator means are manually actuable by the operator when seated, and a safety circuit for controlling operation of said drive motor means, said safety circuit including a first switch movable to a safety switch condition in response to movement of said first operator means to the first position thereof, a second switch movable to a safety switch condition in response to movement of said second operator means to the first position thereof, a third switch 2!~5731 circuit movable to a safety switch condition in response to the presence of the operator in the seat, and control circuit means arranged to prevent actuation of said starter motor except when said first and second switches are both in the safety switch condition thereof and arranged to prevent said control system from allowing operation of said drive motor means except when either both said first and second switches together are in the safety switch condition thereof or when the third switch circuit is in the safety switch condition thereof.
One embodiment of the invention will now be described in conjunction with the accompanying drawings in which:
DESCRIPTION OF THE DRAWINGS
Figure 1 is a schematic illustration of the safety circuit of a tractor and implement combination according to the present invention.
Figure 2 i9 a schematic side elevational view of a tractor and implement combination incorporating the safety switches of the circuit of Figure 1.
In the drawings like characters of reference indicate corresponding part~ in the different figures.
DETAILED DESCRIPTION
20~7~1 Turning fir~tly to Figure 2, there is shown schematically a tractor and implement combination in the form of a self-propelled swather having a tractor unit lO and an implement 11 constituted by a swather header. The tractor unit 10 includes a frame 12 and ground wheels 13 and ]4 generally the front of which is driven to propel the tractor by a hydraulic drive system 15. The rear wheel 14 is generally a castor wheel which is free to rotate so the steering and drive system for the tractor is provided by the control of the hydraulic fluid to the hydraulic drive system 15 to the front wheel.
The tractor further includes a motor 16 mounted within a housing 17. The motor includes a conventional electric starter motor 18 and a control system l9 which controls the continued operation of the motor.
In relation to diesel engines, the control system 19 will be constituted by the fuel pump system which must receive power from an electrical supply of the engine to continue to 3upply the pressurized fuel to the engine to maintain the engine in operation. In respect of a gasoline engine, the control system is constituted by the conventional ignition system. The term control system i~ used herein for convenience to indicate either of these systems and of course 20~73~
generally the control system is actuated by the operator by moving a key actuated switch to a "run" position.
The tractor unit further includes an operator seat 20 mounted within a cab 21. The seat includes a seat switch 22 for sensing the presence of the operator.
The controls to the tractor unit include a steering system schematically indicated at 23 and first and second levers 24 and 25 respectively which actuate the implement and the drive to the tractor respectively. These again are shown schematically and simply illustrate a lever operable by the operator when seated in the seat. The lever 25 is operable to control the transmission of the tractor from a neutral position to forward and reverse positions. This acts to control supply of hydraulic fluid from a pump 26 driven by the engine 16 to the drive system 15. The lever 24 controls a drive system of the header schematically indicated at 34. The lever 24 include~ a first switch 27 responsive to movement of the lever to a first inoperative position of the implement.
The lever 25 includes a second switch 28 responsive to movement of the lever 25 to a neutral position of the transmission~
The implement shown schematically includes a frame 30, a reel 31, a draper 32 and a sickle knife 33. The details of the drive 34 are not shown for convenience of 2~731 illustration but in practice can include a mechanical belt drive from the engine to the knife system and a hydraulic drive system to the reel and draper.
Referring now to Figure 1 a safety circuit for controlling actuation of the starter 18 and the control system 19 is provided and incorporating the seat switch 22, the clutch switch 27 responsive to movement of the implement actuation lever 24 to the inoperative position, the second switch 28 responsive to movement of the drive transmission lever 25 to the neutral position and a further bypass switch 35 which is manually operated and is shown in Figure 2 attached to the lever 25. The switch 35 can then therefore be operated manually to the closed position but automatically moves to the open position in response to movement of the lever 25 out of the neutral position. Thus when the transmission lever 25 is in a drive position, the bypass 35 is automatically moved to an open condition as indicated schematically in Figure 2.
The circuit further includes the vehicle battery 36 and an ignition switch 37 which is alao shown schematically in Figure 2. The circuit further includes a fuse 38, a timer 39, a first relay 40 and a second relay 41 which are shown only in Figure 1.
The clutch switch 27 and the transmission neutral - 2~73~
switch 28 are both of the type which are moved to the closed circuit condition in response to movement of the associated lever to the inoperative or neutral position. The seat switch 22 is also of a type which is moved to the closed circuit condition on detection of the presence of the operator on the seat.
The relay 40 includes a coil 40A actuating an armature 40B movable from an open circuit condition to a closed circuit condition in an electrical connection with a contact 40C. Movement of the relay 40 therefore by actuation of the coil thereof causes connection of a voltage across the starter motor 18 from the battery 36 to ground.
The relay 41 includes a coil 41A actuating an armature 41B movable between the first contact 41C and the second contact 41D. The first contact 41C is cannected in a circuit through the seat switch 22 to the control system 19 to supply power to the control system when the seat switch is in the closed position. The contact 41D is connected directly to the control system to provide power thereto when the coil 41A
i9 actuated to move the armature to the contact 41D. The power for the control system is taken from a line 42 on the downstream side of the fuse 38. A third route for the power to the control system can be supplied through a line 43 into the , 2~ 73~
timer 39 for connection across a five second delay connector from contact 1 to contact 6 of the timer, but after the five seconds is timed out, the contact is disconnected and the control system connected from contact 6 to contact 2 to ground.
In operation in an initial condition of the machine, the clutch switch 27 is moved to the closed position by disengagement of the drive to the implement and the transmission neutral switch 28 is moved to the closed condition by movement of the transmission to the neutral position. The position of the bypass switch will normally in this condition be open as the operator will not want to operate the bypass at this time. The operator may or may not be seated in the seat in which case the seat switch will either be in the closed position or in the open position which is not important at this time.
With the switches 27 and 28 therefore closed, power from the ignition switch 37 i9 connected through a start line through the coil 48 and the switches 27 and 28 to ground thus actuating the coil 48 to pull the armature to complete the contact to the starter motor. The starter motor can thus be actuated by movement of the ignition switch to the start position by the operator.
At the same time power is supplied on the line 42 204~73~
from the run contact to the ignition switch which again passes through the switches 27 and 28 to ground thus actuating the coil 41A and moving the armature 41B into electrical engagement with the contact 41D to supply power to the control system 19 regardless of the condition of the seat switch or the timer.
In this condition therefore the ignition switch 27 can be actuated to start and to operate the motor 16 in the conventional manner. Once started, the operator can move the transmission into drive by actuating the lever 25 and/or the implement drive by actuating the lever 24 in which case one or both of the switches 27 and 28 will be moved to the open condition. When this occurs, the coil 41A of the relay 41 is deactuated so that the armature moves to the contact 41C. In thi9 condition therefore power is supplied to the control system 19 only through the seat switch 22. If the operator therefore moves from the seat thus opening the seat switch 22, power is no longer supplied to the control system through the ralay. At this time therefore, the timer comes into play and provides connection through the line 43 to the control system for the time period for example of five seconds. After the timer has timed out, the control system is disconnected and the motor will stop. The timer of course allows the operator to adjust his position or temporarily stand without the engine 2~4~731 instantaneously stopping which would of course be an inconvenience. The timer does not however allow a long enough period for him to leave his seat and move to a location outside the cab or away from the normal operator position which of course could present him into a dangerous location. It is therefore not possible for the operator to leave the seat while either the implement is running or the transmission is not in neutral so that there is no danger that the operator will leave the seat while for example the machine is halted due to resistance on the wheels but is not actually in the neutral position of the drive system. This can of course be very dangerous in that the operator can believe that the machine is properly halted and, without the system described above could leave the seat while the machine i~ halted and then find the machine restart because it was not actually in neutral but it was merely temporarily halted by the resistance to the wheels overcoming the power supplied through the transmission system.
The circuit described above is very simple and yet provides very safe control over the operation of the machine.
The bypass switch 35 is an optional arrangement which can be omitted in some of the embodiments of the device.
The bypass switch 35 can be used by the operator manually and 204~731 deliberately to close the switch 35 to provide a circuit through the switch 35 and through the switch 28 to ground thus actuating the coil 41A while the clutch switch 27 remains in open condition. Thus the operator can move the transmission to neutral but leave the implement running while he leaves the seat to observe the running of the implement for example to diagnose problems or noises arising in the implement. The bypass switch 35 does not however allow the operator to leave the seat while the transmission is not in neutral. The bypass switch is also automatically returned to the open condition by movement of the transmission lever 25 to the operating position so that the system is returned to its normal safety condition after the bypass has been used and is no longer required.
Since various modifications can be made in my invention as hereinabove described, and many apparently widely different embodiments of same made within the 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.
BACKGROUND OF THE INVENTION
This invention relates to a safety circuit for controlling the drive motor of a tractor and implement combination.
A tractor and implement combination for example a swather or a mower includes a drive motor and a transmission system for transmitting drive power from the motor to drlve the tractor and to drive the implement. Safety circuits are often provided in an arrangement of this type for example which prevent operation of the starter motor to start the engine when the implement drive system is engaged. Seat switches are also known which can operate to stop the engine if the operator leaves the seat for any reason.
SUMMARY OF THE INVENTION
It is an object of the present invention to provide an improved safety circuit arrangement for a tractor and implement combination.
According to the invention, therefore, there is provided a tractor for moving and driving an agricultural implement comprising a tractor body, an implement, means 204~731 connecting the implement to the tractor body for transportation with the tractor body in movement across the ground, first drive means for driving operation of the implement, manually movable first operator means movable from the first deactivated position to a second position actuating said first dcive means, second drive means for driving movement of said tractor body across the ground, manually movable second operator means movable from first deactivated position to a second position actuating said second drive means, drive motor means for developing power for transmission to said first and second drive means, an electrically operated starter motor for commencing operation of said drive motor means, an electrically operated control system for allowing commencement and continuation of operation of said drive motor means, seat mounted on the tractor body for an operator such that said flrst and second operator means are manually actuable by the operator when seated, and a safety circuit for controlling operation of said drive motor means, said safety circuit including a first switch movable to a safety switch condition in response to movement of said first operator means to the first position thereof, a second switch movable to a safety switch condition in response to movement of said second operator means to the first position thereof, a third switch 2!~5731 circuit movable to a safety switch condition in response to the presence of the operator in the seat, and control circuit means arranged to prevent actuation of said starter motor except when said first and second switches are both in the safety switch condition thereof and arranged to prevent said control system from allowing operation of said drive motor means except when either both said first and second switches together are in the safety switch condition thereof or when the third switch circuit is in the safety switch condition thereof.
One embodiment of the invention will now be described in conjunction with the accompanying drawings in which:
DESCRIPTION OF THE DRAWINGS
Figure 1 is a schematic illustration of the safety circuit of a tractor and implement combination according to the present invention.
Figure 2 i9 a schematic side elevational view of a tractor and implement combination incorporating the safety switches of the circuit of Figure 1.
In the drawings like characters of reference indicate corresponding part~ in the different figures.
DETAILED DESCRIPTION
20~7~1 Turning fir~tly to Figure 2, there is shown schematically a tractor and implement combination in the form of a self-propelled swather having a tractor unit lO and an implement 11 constituted by a swather header. The tractor unit 10 includes a frame 12 and ground wheels 13 and ]4 generally the front of which is driven to propel the tractor by a hydraulic drive system 15. The rear wheel 14 is generally a castor wheel which is free to rotate so the steering and drive system for the tractor is provided by the control of the hydraulic fluid to the hydraulic drive system 15 to the front wheel.
The tractor further includes a motor 16 mounted within a housing 17. The motor includes a conventional electric starter motor 18 and a control system l9 which controls the continued operation of the motor.
In relation to diesel engines, the control system 19 will be constituted by the fuel pump system which must receive power from an electrical supply of the engine to continue to 3upply the pressurized fuel to the engine to maintain the engine in operation. In respect of a gasoline engine, the control system is constituted by the conventional ignition system. The term control system i~ used herein for convenience to indicate either of these systems and of course 20~73~
generally the control system is actuated by the operator by moving a key actuated switch to a "run" position.
The tractor unit further includes an operator seat 20 mounted within a cab 21. The seat includes a seat switch 22 for sensing the presence of the operator.
The controls to the tractor unit include a steering system schematically indicated at 23 and first and second levers 24 and 25 respectively which actuate the implement and the drive to the tractor respectively. These again are shown schematically and simply illustrate a lever operable by the operator when seated in the seat. The lever 25 is operable to control the transmission of the tractor from a neutral position to forward and reverse positions. This acts to control supply of hydraulic fluid from a pump 26 driven by the engine 16 to the drive system 15. The lever 24 controls a drive system of the header schematically indicated at 34. The lever 24 include~ a first switch 27 responsive to movement of the lever to a first inoperative position of the implement.
The lever 25 includes a second switch 28 responsive to movement of the lever 25 to a neutral position of the transmission~
The implement shown schematically includes a frame 30, a reel 31, a draper 32 and a sickle knife 33. The details of the drive 34 are not shown for convenience of 2~731 illustration but in practice can include a mechanical belt drive from the engine to the knife system and a hydraulic drive system to the reel and draper.
Referring now to Figure 1 a safety circuit for controlling actuation of the starter 18 and the control system 19 is provided and incorporating the seat switch 22, the clutch switch 27 responsive to movement of the implement actuation lever 24 to the inoperative position, the second switch 28 responsive to movement of the drive transmission lever 25 to the neutral position and a further bypass switch 35 which is manually operated and is shown in Figure 2 attached to the lever 25. The switch 35 can then therefore be operated manually to the closed position but automatically moves to the open position in response to movement of the lever 25 out of the neutral position. Thus when the transmission lever 25 is in a drive position, the bypass 35 is automatically moved to an open condition as indicated schematically in Figure 2.
The circuit further includes the vehicle battery 36 and an ignition switch 37 which is alao shown schematically in Figure 2. The circuit further includes a fuse 38, a timer 39, a first relay 40 and a second relay 41 which are shown only in Figure 1.
The clutch switch 27 and the transmission neutral - 2~73~
switch 28 are both of the type which are moved to the closed circuit condition in response to movement of the associated lever to the inoperative or neutral position. The seat switch 22 is also of a type which is moved to the closed circuit condition on detection of the presence of the operator on the seat.
The relay 40 includes a coil 40A actuating an armature 40B movable from an open circuit condition to a closed circuit condition in an electrical connection with a contact 40C. Movement of the relay 40 therefore by actuation of the coil thereof causes connection of a voltage across the starter motor 18 from the battery 36 to ground.
The relay 41 includes a coil 41A actuating an armature 41B movable between the first contact 41C and the second contact 41D. The first contact 41C is cannected in a circuit through the seat switch 22 to the control system 19 to supply power to the control system when the seat switch is in the closed position. The contact 41D is connected directly to the control system to provide power thereto when the coil 41A
i9 actuated to move the armature to the contact 41D. The power for the control system is taken from a line 42 on the downstream side of the fuse 38. A third route for the power to the control system can be supplied through a line 43 into the , 2~ 73~
timer 39 for connection across a five second delay connector from contact 1 to contact 6 of the timer, but after the five seconds is timed out, the contact is disconnected and the control system connected from contact 6 to contact 2 to ground.
In operation in an initial condition of the machine, the clutch switch 27 is moved to the closed position by disengagement of the drive to the implement and the transmission neutral switch 28 is moved to the closed condition by movement of the transmission to the neutral position. The position of the bypass switch will normally in this condition be open as the operator will not want to operate the bypass at this time. The operator may or may not be seated in the seat in which case the seat switch will either be in the closed position or in the open position which is not important at this time.
With the switches 27 and 28 therefore closed, power from the ignition switch 37 i9 connected through a start line through the coil 48 and the switches 27 and 28 to ground thus actuating the coil 48 to pull the armature to complete the contact to the starter motor. The starter motor can thus be actuated by movement of the ignition switch to the start position by the operator.
At the same time power is supplied on the line 42 204~73~
from the run contact to the ignition switch which again passes through the switches 27 and 28 to ground thus actuating the coil 41A and moving the armature 41B into electrical engagement with the contact 41D to supply power to the control system 19 regardless of the condition of the seat switch or the timer.
In this condition therefore the ignition switch 27 can be actuated to start and to operate the motor 16 in the conventional manner. Once started, the operator can move the transmission into drive by actuating the lever 25 and/or the implement drive by actuating the lever 24 in which case one or both of the switches 27 and 28 will be moved to the open condition. When this occurs, the coil 41A of the relay 41 is deactuated so that the armature moves to the contact 41C. In thi9 condition therefore power is supplied to the control system 19 only through the seat switch 22. If the operator therefore moves from the seat thus opening the seat switch 22, power is no longer supplied to the control system through the ralay. At this time therefore, the timer comes into play and provides connection through the line 43 to the control system for the time period for example of five seconds. After the timer has timed out, the control system is disconnected and the motor will stop. The timer of course allows the operator to adjust his position or temporarily stand without the engine 2~4~731 instantaneously stopping which would of course be an inconvenience. The timer does not however allow a long enough period for him to leave his seat and move to a location outside the cab or away from the normal operator position which of course could present him into a dangerous location. It is therefore not possible for the operator to leave the seat while either the implement is running or the transmission is not in neutral so that there is no danger that the operator will leave the seat while for example the machine is halted due to resistance on the wheels but is not actually in the neutral position of the drive system. This can of course be very dangerous in that the operator can believe that the machine is properly halted and, without the system described above could leave the seat while the machine i~ halted and then find the machine restart because it was not actually in neutral but it was merely temporarily halted by the resistance to the wheels overcoming the power supplied through the transmission system.
The circuit described above is very simple and yet provides very safe control over the operation of the machine.
The bypass switch 35 is an optional arrangement which can be omitted in some of the embodiments of the device.
The bypass switch 35 can be used by the operator manually and 204~731 deliberately to close the switch 35 to provide a circuit through the switch 35 and through the switch 28 to ground thus actuating the coil 41A while the clutch switch 27 remains in open condition. Thus the operator can move the transmission to neutral but leave the implement running while he leaves the seat to observe the running of the implement for example to diagnose problems or noises arising in the implement. The bypass switch 35 does not however allow the operator to leave the seat while the transmission is not in neutral. The bypass switch is also automatically returned to the open condition by movement of the transmission lever 25 to the operating position so that the system is returned to its normal safety condition after the bypass has been used and is no longer required.
Since various modifications can be made in my invention as hereinabove described, and many apparently widely different embodiments of same made within the 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.
Claims
(1 A tractor for moving and driving an agricultural implement comprising a tractor body, an implement, means connecting the implement to the tractor body for transportation with the tractor body in movement across the ground, first drive means for driving operation of the implement, manually movable first operator means movable from the first deactivated position to a second position actuating said first drive means, second drive means for driving movement of said tractor body across the ground, manually movable second operator means movable from first deactivated position to a second position actuating said second drive means, drive motor means for developing power for transmission to said first and second drive means, an electrically operated starter motor for commencing operation of said drive motor means, an electrically operated control system for allowing commencement and continuation of operation of said drive motor means, seat mounted on the tractor body for an operator such that said first and second operator means are manually actuable by the operator when seated, and a safety circuit for controlling operation of said drive motor means, said safety circuit including a first switch movable to a safety switch condition in response to movement of said first operator means to the first position thereof, a second switch movable to a safety switch condition in response to movement of said second operator means to the first position thereof, a third switch circuit movable to a safety switch condition in response to the presence of the operator in the seat, and control circuit means arranged to prevent actuation of said starter motor except when said first and second switches are both in the safety switch condition thereof and arranged to prevent said control system from allowing operation of said drive motor means except when either both said first and second switches together are in the safety switch condition thereof or when the third switch circuit is in the safety switch condition thereof.
(2) The tractor according to claim 1 wherein the third switch circuit include a timer arranged to move the third switch circuit out of said safety switch condition thereof only after a predetermined time subsequent to the movement of the operator from the seat.
(3) The tractor according to claim 1 including a starter switch which is manually actuable by the operator to actuate said starter motor, a first relay having a coil thereof mounted in series with the starter switch and in series with said first and second switch, said relay being therefore only operable when both said first and second switches are in the closed position thereof constituting the safety switch condition thereof, energization of the coil of the relay being arranged to actuate said starter motor.
(4) The tractor according to claim 3 wherein the third switch circuit includes a second relay having a coil thereof in series with the first and second switches, the coil being operable upon energization to switch from a first contact to a second contact, the second relay being arranged to control the supply of power to said control system through a selected one of said first and second contacts in dependance upon the energization condition of the coil, the first contact being connected to said control system through a seat switch responsive to the presence of the operator on the seat and the second contact being connected to the control system so that with the first and second switches in the safety switch condition thereof power is supplied to the control system regardless of the condition of the seat switch so that when the seat switch is in the position thereof responsive to the presence of the operator, the first and second operator means can be moved to the second position thereof.
(5) The tractor according to claim 1 including bypass switch means manually operable by the operator to bypass the first switch.
(6) The tractor according to claim 5 including means responsive to movement of the second operator means to open said bypass switch.
(2) The tractor according to claim 1 wherein the third switch circuit include a timer arranged to move the third switch circuit out of said safety switch condition thereof only after a predetermined time subsequent to the movement of the operator from the seat.
(3) The tractor according to claim 1 including a starter switch which is manually actuable by the operator to actuate said starter motor, a first relay having a coil thereof mounted in series with the starter switch and in series with said first and second switch, said relay being therefore only operable when both said first and second switches are in the closed position thereof constituting the safety switch condition thereof, energization of the coil of the relay being arranged to actuate said starter motor.
(4) The tractor according to claim 3 wherein the third switch circuit includes a second relay having a coil thereof in series with the first and second switches, the coil being operable upon energization to switch from a first contact to a second contact, the second relay being arranged to control the supply of power to said control system through a selected one of said first and second contacts in dependance upon the energization condition of the coil, the first contact being connected to said control system through a seat switch responsive to the presence of the operator on the seat and the second contact being connected to the control system so that with the first and second switches in the safety switch condition thereof power is supplied to the control system regardless of the condition of the seat switch so that when the seat switch is in the position thereof responsive to the presence of the operator, the first and second operator means can be moved to the second position thereof.
(5) The tractor according to claim 1 including bypass switch means manually operable by the operator to bypass the first switch.
(6) The tractor according to claim 5 including means responsive to movement of the second operator means to open said bypass switch.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA 2045731 CA2045731A1 (en) | 1991-06-26 | 1991-06-26 | Safety circuit for the drive motor of a tractor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA 2045731 CA2045731A1 (en) | 1991-06-26 | 1991-06-26 | Safety circuit for the drive motor of a tractor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2045731A1 true CA2045731A1 (en) | 1992-12-27 |
Family
ID=4147914
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2045731 Abandoned CA2045731A1 (en) | 1991-06-26 | 1991-06-26 | Safety circuit for the drive motor of a tractor |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA2045731A1 (en) |
-
1991
- 1991-06-26 CA CA 2045731 patent/CA2045731A1/en not_active Abandoned
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FZDE | Dead |