GB2160266A

GB2160266A - Tractor safety devices

Info

Publication number: GB2160266A
Application number: GB08415429A
Authority: GB
Inventors: Michael Stephen Ramsey; Paul Anthony Cheney
Original assignee: Individual
Current assignee: Individual
Priority date: 1984-06-16
Filing date: 1984-06-16
Publication date: 1985-12-18
Also published as: GB8415429D0

Abstract

Pendulums in an oil filled chamber 1 adjustably mounted on a tractor diesel engine operate the cams of switches 3 and 4 in response to tractor tilting to energise a solenoid 5 and move a fuel pump stop level. A warning signal is operated before fuel cut-off which may be prevented by a push button over-ride. A brake on a power take-off may be operated with fuel cut-off which may also be effected by trip wires and switches associated with tractor driven machinery. <IMAGE>

Description

SPECIFICATION Tractor safety device This invention relates to a safety device to be fitted to tractors and machinery attached to them.

Every year many people are killed or seriously injured by accidents involving farm tractors and machinery attached to them. Many are killed when a tractor rolls over backwards onto itself like a "wheelie" and crushes the driver. The majority of farm workers injured are caught up in machinery without any means of being able to stop the machinery.

According to the present invention. there is an electrically connected circuit to a solenoid valve which operates an immediate fuel shutoff to the injection pumps thus stopping the diesel engine almost immediately.

This electrical shut-off circuit is operated by an unlimited number of switches or trips.

There are switches which sense tilt or inclination of the tractor. There are trip wires in front of balers etc. which would be operated if anybody was pulled into the machine. Once these trips are activated, the engine and hence the machinery driven from the tractor.

would stop.

A facility for a P.T.O. shaft brake is available where during normal running a hydraulic/electric brake is held clear of the shaft but would operate to clamp the shaft in emergency tripping.

Electrical Operation 1 The Start Circuit Switch on ignition switch (IGN) and push start button. Current flows from "Line A" to "Line C" energizing start solenoid (SOL SS1).

2 The start solenoid closes its own normally open contact (CONTACT SS1) and aliows current to pass from "Line A" to "Line C" via starter motor and also energizing the heavy duty coil in solenoid (PS1 Pump Solenoid).

Once energized it makes the contact PSla which maintains the flow of current to the low power consumption holding coil in the pump solenoid marked SOL PSla and breaks the contact PS1 leaving the solenoid on a very low power consumption holding coil PSla.

Solenoid PSla allows fuel into the pump and if any extreme tilts happen or any safety trip wire or switch is activated, the switches will break the holding circuit and the engine will stop, and hence all machinery driven from the engine via the power take-off (PTO) shaft.

3 The brake hold off solenoid shown dotted on the electrical drawing is an optional extra for electra/Hydraulic braking of the PTO shaft for even quicker stopping of shaft driven machinery.

4 The protective cover of the PTO shaft could be fitted with a plug which fits into a socket by the PTO, Any machinery etc. which is attached to the PTO would have to have a plug and be plugged into the tractor. An override switch is provided to enable the apparatus to be lined up without having to stop the tractor engine. The over-ride switch is nonlockable push button so that the over-ride cannot be accidentally switched in perma- nently.

5 When the tractor leans sideways to a dangerous degree. a warning signal is given.

The engine is never cut off under these circumstances.

6 When the tractor is climbing a very steep slope. a warning signal is given. The over-ride button can then be pushed in to allow the tractor to continue up hill. If. in this situation.

the tractor did start to go over backwards.

natural instinct would force the driver to release the push button and grasp the steering wheel or similar. Once the over-ride button was released. the engine would cut off and the tractor would return to all wheels on the ground. The engine would then need to be restarted as in item 1.

Any machine attached to the tractor with this device on could have trip wires on long exposed machines i.e. across the top of a baler. If one got caught up in the works, one touch on the trip line would stop the engine and hence the drive and prevent worker being pulled into ram and losing an arm etc.

1. Tractor safety device to warn if sideways tilt of tractor is near the manufactures recommended safe maximum. In this mode the tractor engine will not cut out but a warning signal will be given.

2. To cut the engine if the tractor starts to tilt back on itself (i.e. when pulling up tree roots etc.). which would allow the tractor to return all wheels on the ground.

3. To enable the engine to be stopped immediately and hence all machinery etc.

driven from the power take off shaft (PTO) in the event of anyone or thing making contact with any of the many and various types of trip switches and wires.

4. To allow for a PTO shaft to be installed for quicker stopping.

5. This invention is an electro mechanical device comprising two hinged and adjustable oil dampened pendulum switches. These are mounted on a refillable. sealed, oil filled box together with a dual power solenoid valve which in turn is attached via self adjusting spring tensioned coupler to the fuel shut off valve of the diesel injection pump. (See Fig. 1 and 2.) 6. This oil filled chamber is to fit onto the engine block of a tractor behind the pump on adjustable brackets. The oil in the chamber dampens vibration, heavy braking, quick acceleration and other such spasmodic minor movements.

**WARNING** end of DESC field may overlap start of CLMS **.

Claims

**WARNING** start of CLMS field may overlap end of DESC **.

SPECIFICATION Tractor safety device This invention relates to a safety device to be fitted to tractors and machinery attached to them.

Every year many people are killed or seriously injured by accidents involving farm tractors and machinery attached to them. Many are killed when a tractor rolls over backwards onto itself like a "wheelie" and crushes the driver. The majority of farm workers injured are caught up in machinery without any means of being able to stop the machinery.

According to the present invention. there is an electrically connected circuit to a solenoid valve which operates an immediate fuel shutoff to the injection pumps thus stopping the diesel engine almost immediately.

This electrical shut-off circuit is operated by an unlimited number of switches or trips.

There are switches which sense tilt or inclination of the tractor. There are trip wires in front of balers etc. which would be operated if anybody was pulled into the machine. Once these trips are activated, the engine and hence the machinery driven from the tractor.

would stop.

A facility for a P.T.O. shaft brake is available where during normal running a hydraulic/electric brake is held clear of the shaft but would operate to clamp the shaft in emergency tripping.

Electrical Operation 1 The Start Circuit Switch on ignition switch (IGN) and push start button. Current flows from "Line A" to "Line C" energizing start solenoid (SOL SS1).
2 The start solenoid closes its own normally open contact (CONTACT SS1) and aliows current to pass from "Line A" to "Line C" via starter motor and also energizing the heavy duty coil in solenoid (PS1 Pump Solenoid).

Once energized it makes the contact PSla which maintains the flow of current to the low power consumption holding coil in the pump solenoid marked SOL PSla and breaks the contact PS1 leaving the solenoid on a very low power consumption holding coil PSla.

Solenoid PSla allows fuel into the pump and if any extreme tilts happen or any safety trip wire or switch is activated, the switches will break the holding circuit and the engine will stop, and hence all machinery driven from the engine via the power take-off (PTO) shaft.
3 The brake hold off solenoid shown dotted on the electrical drawing is an optional extra for electra/Hydraulic braking of the PTO shaft for even quicker stopping of shaft driven machinery.
4 The protective cover of the PTO shaft could be fitted with a plug which fits into a socket by the PTO, Any machinery etc. which is attached to the PTO would have to have a plug and be plugged into the tractor. An override switch is provided to enable the apparatus to be lined up without having to stop the tractor engine. The over-ride switch is nonlockable push button so that the over-ride cannot be accidentally switched in perma- nently.
5 When the tractor leans sideways to a dangerous degree. a warning signal is given.

The engine is never cut off under these circumstances.
6 When the tractor is climbing a very steep slope. a warning signal is given. The over-ride button can then be pushed in to allow the tractor to continue up hill. If. in this situation.

the tractor did start to go over backwards.

natural instinct would force the driver to release the push button and grasp the steering wheel or similar. Once the over-ride button was released. the engine would cut off and the tractor would return to all wheels on the ground. The engine would then need to be restarted as in item 1.

Any machine attached to the tractor with this device on could have trip wires on long exposed machines i.e. across the top of a baler. If one got caught up in the works, one touch on the trip line would stop the engine and hence the drive and prevent worker being pulled into ram and losing an arm etc.

1. Tractor safety device to warn if sideways tilt of tractor is near the manufactures recommended safe maximum. In this mode the tractor engine will not cut out but a warning signal will be given.

2. To cut the engine if the tractor starts to tilt back on itself (i.e. when pulling up tree roots etc.). which would allow the tractor to return all wheels on the ground.

3. To enable the engine to be stopped immediately and hence all machinery etc.

driven from the power take off shaft (PTO) in the event of anyone or thing making contact with any of the many and various types of trip switches and wires.

4. To allow for a PTO shaft to be installed for quicker stopping.

5. This invention is an electro mechanical device comprising two hinged and adjustable oil dampened pendulum switches. These are mounted on a refillable. sealed, oil filled box together with a dual power solenoid valve which in turn is attached via self adjusting spring tensioned coupler to the fuel shut off valve of the diesel injection pump. (See Fig. 1 and 2.) 6. This oil filled chamber is to fit onto the engine block of a tractor behind the pump on adjustable brackets. The oil in the chamber dampens vibration, heavy braking, quick acceleration and other such spasmodic minor movements.
7. The guard which should normally be fitted over the PTO shaft would be fitted with an electrical connection so that unless machinery was attached to the shaft and electrical connections made to the tractor via a simple plug (with anti-vibration locking ring), the tractor engine would not run.
8. Over-ride facilities in the form of push buttons have been incorporated to allow for: a, Uncoupling machinery without stopping the tractor engine.

b. To allow tractor to climb steep hills without the sensor switches cutting out the engine.