Title of Invention	LIFT EVACUATION SYSTEM FOR POWER FAILURES
Abstract	The invention relates to a hydraulicaliy operated lift evacuation system which brings the lift cabin safely in front of the immediate lower floor, so that the commuters can come out safely without the help of lift man or any other external help other than this system. The system comprises of two piston cylinder arrangement which connects the elevator head to the elevator cabin, so as to comfortably detach the elevator cabin from lift head and lowers the lift cabin to the immediate lower floor in event of the power failure. The system is manually actuated by commuters inside the lift cabin.

Title of Invention

LIFT EVACUATION SYSTEM FOR POWER FAILURES

Abstract

The invention relates to a hydraulicaliy operated lift evacuation system which brings the lift cabin safely in front of the immediate lower floor, so that the commuters can come out safely without the help of lift man or any other external help other than this system. The system comprises of two piston cylinder arrangement which connects the elevator head to the elevator cabin, so as to comfortably detach the elevator cabin from lift head and lowers the lift cabin to the immediate lower floor in event of the power failure. The system is manually actuated by commuters inside the lift cabin.

Full Text	FORM 2 THE PATENTS ACT, 1970 (39 of 1970) COMPLETE SPECIFICATION (See section 10; rule 13) 1. Title of the invention: 1.1 Lift evacuation system for power failures 2.1 a) Ashish Bhardwaj b) H. No-3. Golden Lane, Opposite Janta Flour Mills, Gangyal, Jammu, J&K, India-180010 c) Indian 2.2 a) Rashmi Morab b) H. No-3, Golden Lane, Opposite Janta Flour Mills. Gangyal, Jammu, J&K, India-180010 c) Indian Field of invention: This invention relates to a hydraulically operated emergency elevator operating system FIG. 1. This invention provides a system fitted to the elevator such as elevators operated by electric motor to evacuate people when main power supply fails or even during fire hazards. In the existing/conventional system, the main problem faced is during power failures when the elevator gets stuck in between two floors and causes a lot of inconvenience to commuters. In the present day condition of frequent power failure, stoppage of elevator in between two floors is causing problems for the people. More over when the power failure is because of fire hazard, the situation is even worst, as the use of back up system like generators and invertors is not possible. In the existing elevators, the commonly used practice is to call the watchman who moves the elevator to the nearest floor, which is very time consuming, laborious and difficult task; another method used is that the watchman comes and opens the door of the elevator and commuters have to jump out of the hanging elevator, which is very dangerous. To overcome the above-mentioned drawbacks in the existing system of elevators, it was necessitated to develop a system that could be installed in the existing system to work in emergency, when the elevator is held up in between two floors, to bring the elevator to the immediate lower floor. The principle object of this invention is that it operates during any kind of power failure, which may be due to power cuts or due to an emergency like fire or earthquake. According to another object of this invention, it operates when the fuse of the main motor 22 fails. According to another object of this invention, the system does not come into operation unless actuated manually by the commuters inside the elevator cabin 19. According to another objective of this invention, the elevator cabin 19 should detach from the elevator head 5 and lower down itself to the immediate lower floor so as to allow the commuters inside the elevator cabin to come out of the elevator safely and with minimum wastage of time. According to another objective of this invention the elevator cabin detaches itself from elevator head 5 and lowers to the immediate lower floor. According to another objective of this invention, as soon as the system comes into operation, the main power supply is diverted from the main motor 22 to a pump 7 necessary to restore the system to its original position and return the power to the main motor only after the elevator cabin reaches back to its original position. According to yet another object of the invention, the functional or the operating mechanism used is hydraulically operated FIG. 1 and therefore is much more reliable than any other electrically or pneumatically operated systems. Thus, in accordance with this invention, the hydraulic emergency elevator evacuation system comprises of two cylinder piston arrangement FIG 1 which connects the elevator head to the elevator cabin, so as to comfortably detach the elevator cabin from the elevator head and lower the elevator cabin to the immediate lower floor in the event of power failure and the system being manually actuated by the commuter/s inside the elevator cabin. The various subunits of the system, namely, the cabin, the hydraulic cylinders, the circuits for actuating two solenoid valves and the circuit to switch power supply from the main motor to the pump and the pump to the main motor have been shown in the figure 1, figure2, flgure3, figure4 and figure 5 of the accompanying drawings which make the net operation of the system come into effect. This invention relates to the hydraulic system installed in an elevator. This system can be installed in an elevator configuration with modifications required in the elevator car. Prior Art In prior art, whenever there is a power failure the watchman reaches to the floor where elevator is stuck and manually moves the elevator till it reaches the nearest floor. Another method practiced is in which the watchman opens the door directly with the help of a key and the passengers have to jump out of the elevator in its hanging position. This method is very dangerous and may lead to accidents. In buildings where there is provision of a power back up, there is no requirement of watchman for rescuing the passengers, but then criticality of situation becomes even worse in such case. Problems like fire and failure in electric wiring and minor problems in the main suspensions can be very dangerous in this case. The present invention is unique from the prior art in the following manner: 1. The present invention relates to a hydraulically operated lift evacuation system, whereas in the existing system the system is manually operated and a mechanical system for evacuation using ropes of already existing elevator system. 2. In the present invention the lift cabin detaches itself from the lift head and lowers to the immediate lower floor, whereas in the existing system the complete lift (that is Lift head and cabin) is lowered to the immediate lower floor through top suspension ropes. 3. In the present invention hydraulic cylinders are used to lower the detached lift cabin to the immediate lower floor, whereas in the existing system no hydraulic v system is used for evacuation purpose. 4. In the present invention no back-up power supply is used whereas in the existing systems a back-up power supply is used for moving the lift. 5. In the present invention modification in the lift body is done to install hydraulic system and to put proximity sensor, whereas in the existing system there is no such modification. 6. In the present invention a separate system that is a hydraulic system is used for evacuation purpose apart from main pulling system (mechanical), whereas in the present system (hydraulic lifts) the hydraulic system of the hydraulically operated lift is used for controlling purpose in case of emergency or otherwise. Aim of the system The aim of the devised system is to bring the elevator cabin safely in front of the immediate lower floor, so that the passengers can safely come out of the elevator without the help of the liftman. This would also reduce the time delay caused due the subsequent existing operations. Summary of the Invention The system comes into operation when there is any kind of electric power failure. The system also comes into operation when there are fire hazards. This is a passenger-actuated system and will not come into action if the elevator cabin is empty. Once the system comes into operation the electric supply to the motor is cut off and is not restored till the elevator cabin comes back to its original configuration. When the system is actuated, the elevator cabin detaches itself from the elevator head and lowers itself with the help of hydraulic cylinders til! it reaches the immediate lower floor. After lowering, the elevator stops exactly in front of the lower floor, i.e. its correct position. The door automatically unlocks, as (in case of most of the elevators) the door is designed to unlock when the elevator is in the correct position as stated above. The passengers can now come out of the elevator. The elevator remains in this extended form till the electricity is restored. When the electric supply is restored the elevator cabin, is lifted up back to its original configuration as shown in figure 1 with the help of the hydraulic cylinders. The power supply is then diverted back to the motor. As the system operates hydraulically, it is highly reliable. Brief description of Drawings FIG. 1 shows a schematic view of the present invention illustrating the hydraulic system to give overall view. FIG. 2 shows a schematic view of the present invention illustrating the parts of the system placed on the elevator head to show the flow of the hydraulic oil. FIG. 3 shows a schematic view of the circuit 23 which controls the operation of solenoid valve 13 which controls the flow of hydraulic oil in the system. FIG. 4 shows a schematic view of the circuit 24 which controls the operation of solenoid valve 14 which controls the flow of hydraulic oil in the system. FIG. 5 shows schematic view of the circuit 25 which controls the diversion of main power between the pump 7 and the main motor 22. Detailed description of drawings with respect to figures FIG. 1 shows a detailed description of the hydraulic system used in the lift. This figure shows the present invention as installed in the lift in the front view. In this figure all the parts in the hydraulic system, which is the main part of the invention are shown in the front view. This figure shows the hydraulic cylinders installed in the lift system, with the head of the cylinder attached to the lift head and the piston rod attached to the lift cabin 19. The cabin is detached from the lift head. The figure also shows two ducts coming out of the bottom of each piston-cylinder arrangement. One going to the sump 8 directly after joining with the similar duct from the other piston-cylinder arrangement. Second ducts after joining with the similar duct from the other cylinder going to the to the pump 7 and then to the sump8. The figure also shows another ducts from the top of each cylinder to the sump 8. the figure shows proximity sensor 11 attached at the bottom of the lift cabin 19, for sensing the immediate lower floor. The figure also shows another proximity sensor attached in between lift head 5 and top of the lift cabin 19. the figure also shows a push button 12 for activation of the whole system. The figure also shows the lift being attached to the main suspension ropes and in turn to the main pulling motor 22 . FIG. 2 shows the parts of the present invention on the top of the lift head. In this figure the flow of the hydraulic fluid from the pump and the sump is shown. This flow of hydraulic fluid is shown with the help of arrows. In this figure the flow of the hydraulic fluid is explained, in the two ducts from the bottom of each cylinder. In the duct connecting from bottom of the cylinder through a solenoid valve 14 to the pump 7 and then the sump 8 the flow is always from the sump, them to the pump and then to the hydraulic cylinder as shown by the arrows. In the duct connecting the bottom of the cylinder to the sump through a solenoid valve 13 the flow is from the cylinder through the solenoid valve to the sump 8. This figure also shows pair of duct connecting from top of the cylinder to the sump. FIG. 3 shows the control of solenoid valve 13 which controls the flow of hydraulic oil in the system through a circuit 23. The figure shows the control of solenoid valve controller 20 with Push button 12 and Proximity sensor 11, through circuit 23. The figure also shows that solenoid valve controller is further connected to solenoid valve 13 and controls it. FIG. 4 shows the control of solenoid valve 14 which controls the flow of hydraulic oil in the system through circuit 24. The figure shows the control of solenoid valve controller 21 with main electricity pulse and Proximity sensor I 8, through circuit 24. The figure also shows that solenoid valve controller 21 is further connected to solenoid valve 14 and controls it. FIG. 5 shows the connection of the main pulling motor 22 and the pump 7 to the proximity sensorl8 through circuit 25. the figure shows the control of main pulling motor 22 and pump 7 by proximity sensor 18 through circuit 25. This figure shows the arrangement by which the main power supply is diverted to the pump 7 after the system is activated and back to the main motor 22, after the lift come back to it original configuration. Working of the invention: When the power supply is un-interrupted, the elevator runs in a normal manner. Due to power failure, the elevator may halt in between two floors or in a rare occurrence, at a proper floor. If the elevator halts at a proper floor i.e. the elevator stops completely in front of a door, the people can come out immediately without any problem. This is because the doors unlock only when the cabin is in front of the door. If elevator halts in-between two floors (say forth & third floor), hydraulic system comes into action. The commuter/s inside the elevator need/s to actuate the system by pushing a press button 12. As the press button 12 is pressed, the elevator cabin 19 detaches from the elevator head 5 and starts lowering with the help of cylinder-piston arrangement, the piston cylinder 1,2 arrangement is shown in FIG. 1. Pressing the press button 12 generates a 5V signal that actuates solenoid valve 13 operating at 24V, operated with the help of solenoid valve controller 20 shown in FIG. 3. As the solenoid valve 13 opens the weight of the elevator will push the oil below the piston 2 into the oil sump 8 and back to the upper part of the cylinder 1. This causes the elevator to lower itself to the immediate lower floor. The power supply to the main motor 22 is cut and diverted to a pump so that when the power supply is restored, the power is first delivered to the pump 7 and not to the main motor 22. This is done with circuit 25 as shown in FIG. 5. This lowering continues till proximity sensor 11 placed at the bottom of the elevator cabin 19 generates a 5V signal to close the solenoid valve 13. This circuit 23 has been shown in FIG. 3. The elevator doors unlock when the cabin 19 is in front of the floor. The elevator doors are opened manually to allow the commuters out of the elevator safely. The elevator remains in this position in stable condition till the power supply is back. When the power supplies returns, another 5Vsignal from the main electric supply triggers the solenoid valve controller 21 to open the solenoid valve 14. The signal (from the main electric supply) actuates the pump 7 to pump the liquid back into the cylinder to cause the detached elevator cabin 19 to rise. The elevator cabin 19 rises till proximity sensor 18 placed near the elevator head closes the solenoid valve 14 with circuit 24 as shown in FIG. 4 and stops the elevator. If the power supply returns while the elevator is lowering, the electricity is first diverted to the pump 7 which pumps back the liquid to the cylinders 1 and the power returns to the main motor only after the elevator cabin 19 is at its original position. WE CLAIM: 1. A hydraulically operated emergency elevator operating system comprising of: two piston-cylinder arrangement (2,1), a push button 12, a sump 8, a pump 7, a solenoid valve 13, a second solenoid valve 14, a solenoid valve controller 20, a second solenoid valve controller 21, a proximity sensor 11, a second proximity sensor 18, an electric circuit 23, a second electric circuit 24, a third electric circuit 25, a push button 12 which would actuate solenoid valve controller 20 of solenoid valve 13 through the circuit 23; a sump 8 for receiving and giving the hydraulic oil through ducts; a pump 7 for pumping hydraulic oil back to cylinders 1 through ducts on restoration of electricity; a solenoid valve 13 for controlling the flow of hydraulic oil from the sump 8; a second solenoid valve 14 for controlling the flow of hydraulic oil to the cylinders 1 from the sump 8 through the pump 7; an electric circuit 23 means for controlling solenoid valve controller 20 of solenoid valve 13 by push button 12 and proximity sensor 11; a second electric circuit 24 means for controlling solenoid valve controller 21 of solenoid valve 14 by main electric pulse and proximity sensor 18; a third electric circuit 25 means for diverting the main power supply from main motor 22 to the pump 7 and return the power back to main pulling motor 22, after the elevator cabin 19 reaches back to its original position, a two piston-cylinder (2,1) arrangement which connects the elevator head 5 to the elevator cabin 19 and cause the elevator to move to the immediate lower floor in the absence of main power supply, after the system is activated by a push button 12. 2. A device as claimed in claim 1 wherein the said piston -cylinder arrangement is a pair of hydraulic cylinder set. 3. A device as claimed in claim 1 wherein the said push button arrangement is a push button as used on a computer keyboard that will generate a pulse and come back to its original position. 4. A device as claimed in claim 1 wherein the said proximity sensor is a magnetic proximity sensor that will generate electric signal . 5. A device as claimed in claim 1 wherein the said solenoid valve controllers are solenoid valve controllers appropriately programmed to convert input signal to the desired output signal for controlling the said solenoid valve. 6. A device as claimed in claim 1 wherein the said solenoid valves are normally closed solenoid valves operated by the solenoid valve controllers , by an input signal and opening and closing in the presence and absence signal provided by the solenoid valve controller to allow or stop the flow of hydraulic oil in the hydraulic circuit. 7. A device as claimed in claim 1 wherein the said circuit 25 to cut off the power supply to the main motor and divert the power supply to the pump 7 and again divert the power supply to the main motor 22 when the detached cabin 19 returns back to it original position. Dated 26 the day of March 2004

Full Text

FORM 2
THE PATENTS ACT, 1970
(39 of 1970)
COMPLETE SPECIFICATION
(See section 10; rule 13)
1. Title of the invention:
1.1 Lift evacuation system for power failures
2.1 a) Ashish Bhardwaj
b) H. No-3. Golden Lane, Opposite Janta Flour Mills, Gangyal, Jammu, J&K, India-180010
c) Indian
2.2 a) Rashmi Morab
b) H. No-3, Golden Lane, Opposite Janta Flour Mills. Gangyal, Jammu, J&K, India-180010
c) Indian

Field of invention:
This invention relates to a hydraulically operated emergency elevator operating system FIG. 1. This invention provides a system fitted to the elevator such as elevators operated by electric motor to evacuate people when main power supply fails or even during fire hazards. In the existing/conventional system, the main problem faced is during power failures when the elevator gets stuck in between two floors and causes a lot of inconvenience to commuters.
In the present day condition of frequent power failure, stoppage of elevator in between two floors is causing problems for the people. More over when the power failure is because of fire hazard, the situation is even worst, as the use of back up system like generators and invertors is not possible. In the existing elevators, the commonly used practice is to call the watchman who moves the elevator to the nearest floor, which is very time consuming, laborious and difficult task; another method used is that the watchman comes and opens the door of the elevator and commuters have to jump out of the hanging elevator, which is very dangerous.
To overcome the above-mentioned drawbacks in the existing system of elevators, it was necessitated to develop a system that could be installed in the existing system to work in emergency, when the elevator is held up in between two floors, to bring the elevator to the immediate lower floor.
The principle object of this invention is that it operates during any kind of power failure, which may be due to power cuts or due to an emergency like fire or earthquake.
According to another object of this invention, it operates when the fuse of the main motor 22 fails.
According to another object of this invention, the system does not come into operation unless actuated manually by the commuters inside the elevator cabin 19.
According to another objective of this invention, the elevator cabin 19 should detach from the elevator head 5 and lower down itself to the immediate lower floor so as to allow the commuters inside the elevator cabin to come out of the elevator safely and with minimum wastage of time.
According to another objective of this invention the elevator cabin detaches itself from elevator head 5 and lowers to the immediate lower floor.
According to another objective of this invention, as soon as the system comes into operation, the main power supply is diverted from the main motor 22 to a pump 7 necessary to restore the system to its original position and return the power to the main motor only after the elevator cabin reaches back to its original position.

According to yet another object of the invention, the functional or the operating mechanism used is hydraulically operated FIG. 1 and therefore is much more reliable than any other electrically or pneumatically operated systems.
Thus, in accordance with this invention, the hydraulic emergency elevator evacuation system comprises of two cylinder piston arrangement FIG 1 which connects the elevator head to the elevator cabin, so as to comfortably detach the elevator cabin from the elevator head and lower the elevator cabin to the immediate lower floor in the event of power failure and the system being manually actuated by the commuter/s inside the elevator cabin.
The various subunits of the system, namely, the cabin, the hydraulic cylinders, the circuits for actuating two solenoid valves and the circuit to switch power supply from the main motor to the pump and the pump to the main motor have been shown in the figure 1, figure2, flgure3, figure4 and figure 5 of the accompanying drawings which make the net operation of the system come into effect.
This invention relates to the hydraulic system installed in an elevator. This system can be installed in an elevator configuration with modifications required in the elevator car.
Prior Art
In prior art, whenever there is a power failure the watchman reaches to the floor where elevator is stuck and manually moves the elevator till it reaches the nearest floor. Another method practiced is in which the watchman opens the door directly with the help of a key and the passengers have to jump out of the elevator in its hanging position. This method is very dangerous and may lead to accidents.
In buildings where there is provision of a power back up, there is no requirement of watchman for rescuing the passengers, but then criticality of situation becomes even worse in such case. Problems like fire and failure in electric wiring and minor problems in the main suspensions can be very dangerous in this case.
The present invention is unique from the prior art in the following manner:
1. The present invention relates to a hydraulically operated lift evacuation system, whereas in the existing system the system is manually operated and a mechanical system for evacuation using ropes of already existing elevator system.
2. In the present invention the lift cabin detaches itself from the lift head and lowers to the immediate lower floor, whereas in the existing system the complete lift (that is Lift head and cabin) is lowered to the immediate lower floor through top suspension ropes.
3. In the present invention hydraulic cylinders are used to lower the detached lift cabin to the immediate lower floor, whereas in the existing system no hydraulic v system is used for evacuation purpose.
4. In the present invention no back-up power supply is used whereas in the existing systems a back-up power supply is used for moving the lift.

5. In the present invention modification in the lift body is done to install hydraulic system and to put proximity sensor, whereas in the existing system there is no such modification.
6. In the present invention a separate system that is a hydraulic system is used for evacuation purpose apart from main pulling system (mechanical), whereas in the present system (hydraulic lifts) the hydraulic system of the hydraulically operated lift is used for controlling purpose in case of emergency or otherwise.
Aim of the system
The aim of the devised system is to bring the elevator cabin safely in front of the immediate lower floor, so that the passengers can safely come out of the elevator without the help of the liftman. This would also reduce the time delay caused due the subsequent existing operations.
Summary of the Invention
The system comes into operation when there is any kind of electric power failure. The system also comes into operation when there are fire hazards. This is a passenger-actuated system and will not come into action if the elevator cabin is empty. Once the system comes into operation the electric supply to the motor is cut off and is not restored till the elevator cabin comes back to its original configuration. When the system is actuated, the elevator cabin detaches itself from the elevator head and lowers itself with the help of hydraulic cylinders til! it reaches the immediate lower floor. After lowering, the elevator stops exactly in front of the lower floor, i.e. its correct position. The door automatically unlocks, as (in case of most of the elevators) the door is designed to unlock when the elevator is in the correct position as stated above. The passengers can now come out of the elevator.
The elevator remains in this extended form till the electricity is restored. When the electric supply is restored the elevator cabin, is lifted up back to its original configuration as shown in figure 1 with the help of the hydraulic cylinders. The power supply is then diverted back to the motor. As the system operates hydraulically, it is highly reliable.
Brief description of Drawings
FIG. 1 shows a schematic view of the present invention illustrating the hydraulic system to give overall view.
FIG. 2 shows a schematic view of the present invention illustrating the parts of the system placed on the elevator head to show the flow of the hydraulic oil.
FIG. 3 shows a schematic view of the circuit 23 which controls the operation of solenoid valve 13 which controls the flow of hydraulic oil in the system.

FIG. 4 shows a schematic view of the circuit 24 which controls the operation of solenoid valve 14 which controls the flow of hydraulic oil in the system.
FIG. 5 shows schematic view of the circuit 25 which controls the diversion of main power between the pump 7 and the main motor 22.
Detailed description of drawings with respect to figures
FIG. 1 shows a detailed description of the hydraulic system used in the lift. This figure shows the present invention as installed in the lift in the front view. In this figure all the parts in the hydraulic system, which is the main part of the invention are shown in the front view. This figure shows the hydraulic cylinders installed in the lift system, with the head of the cylinder attached to the lift head and the piston rod attached to the lift cabin 19. The cabin is detached from the lift head. The figure also shows two ducts coming out of the bottom of each piston-cylinder arrangement. One going to the sump 8 directly after joining with the similar duct from the other piston-cylinder arrangement. Second ducts after joining with the similar duct from the other cylinder going to the to the pump 7 and then to the sump8. The figure also shows another ducts from the top of each cylinder to the sump 8. the figure shows proximity sensor 11 attached at the bottom of the lift cabin 19, for sensing the immediate lower floor. The figure also shows another proximity sensor attached in between lift head 5 and top of the lift cabin 19. the figure also shows a push button 12 for activation of the whole system. The figure also shows the lift being attached to the main suspension ropes and in turn to the main pulling motor 22 .
FIG. 2 shows the parts of the present invention on the top of the lift head. In this figure the flow of the hydraulic fluid from the pump and the sump is shown. This flow of hydraulic fluid is shown with the help of arrows. In this figure the flow of the hydraulic fluid is explained, in the two ducts from the bottom of each cylinder. In the duct connecting from bottom of the cylinder through a solenoid valve 14 to the pump 7 and then the sump 8 the flow is always from the sump, them to the pump and then to the hydraulic cylinder as shown by the arrows. In the duct connecting the bottom of the cylinder to the sump through a solenoid valve 13 the flow is from the cylinder through the solenoid valve to the sump 8. This figure also shows pair of duct connecting from top of the cylinder to the sump.
FIG. 3 shows the control of solenoid valve 13 which controls the flow of hydraulic oil in the system through a circuit 23. The figure shows the control of solenoid valve controller
20 with Push button 12 and Proximity sensor 11, through circuit 23. The figure also
shows that solenoid valve controller is further connected to solenoid valve 13 and
controls it.
FIG. 4 shows the control of solenoid valve 14 which controls the flow of hydraulic oil in the system through circuit 24. The figure shows the control of solenoid valve controller
21 with main electricity pulse and Proximity sensor I 8, through circuit 24. The figure

also shows that solenoid valve controller 21 is further connected to solenoid valve 14 and controls it.
FIG. 5 shows the connection of the main pulling motor 22 and the pump 7 to the proximity sensorl8 through circuit 25. the figure shows the control of main pulling motor 22 and pump 7 by proximity sensor 18 through circuit 25. This figure shows the arrangement by which the main power supply is diverted to the pump 7 after the system is activated and back to the main motor 22, after the lift come back to it original configuration.
Working of the invention:
When the power supply is un-interrupted, the elevator runs in a normal manner. Due to power failure, the elevator may halt in between two floors or in a rare occurrence, at a proper floor. If the elevator halts at a proper floor i.e. the elevator stops completely in front of a door, the people can come out immediately without any problem. This is because the doors unlock only when the cabin is in front of the door. If elevator halts in-between two floors (say forth & third floor), hydraulic system comes into action.
The commuter/s inside the elevator need/s to actuate the system by pushing a press button 12. As the press button 12 is pressed, the elevator cabin 19 detaches from the elevator head 5 and starts lowering with the help of cylinder-piston arrangement, the piston cylinder 1,2 arrangement is shown in FIG. 1. Pressing the press button 12 generates a 5V signal that actuates solenoid valve 13 operating at 24V, operated with the help of solenoid valve controller 20 shown in FIG. 3. As the solenoid valve 13 opens the weight of the elevator will push the oil below the piston 2 into the oil sump 8 and back to the upper part of the cylinder 1. This causes the elevator to lower itself to the immediate lower floor.
The power supply to the main motor 22 is cut and diverted to a pump so that when the power supply is restored, the power is first delivered to the pump 7 and not to the main motor 22. This is done with circuit 25 as shown in FIG. 5. This lowering continues till proximity sensor 11 placed at the bottom of the elevator cabin 19 generates a 5V signal to close the solenoid valve 13. This circuit 23 has been shown in FIG. 3. The elevator doors unlock when the cabin 19 is in front of the floor. The elevator doors are opened manually to allow the commuters out of the elevator safely. The elevator remains in this position in stable condition till the power supply is back. When the power supplies returns, another 5Vsignal from the main electric supply triggers the solenoid valve controller 21 to open the solenoid valve 14.
The signal (from the main electric supply) actuates the pump 7 to pump the liquid back into the cylinder to cause the detached elevator cabin 19 to rise. The elevator

cabin 19 rises till proximity sensor 18 placed near the elevator head closes the solenoid valve 14 with circuit 24 as shown in FIG. 4 and stops the elevator.
If the power supply returns while the elevator is lowering, the electricity is first diverted to the pump 7 which pumps back the liquid to the cylinders 1 and the power returns to the main motor only after the elevator cabin 19 is at its original position.

WE CLAIM:
1. A hydraulically operated emergency elevator operating system comprising of:
two piston-cylinder arrangement (2,1),
a push button 12,
a sump 8,
a pump 7,
a solenoid valve 13,
a second solenoid valve 14,
a solenoid valve controller 20,
a second solenoid valve controller 21,
a proximity sensor 11,
a second proximity sensor 18,
an electric circuit 23,
a second electric circuit 24,
a third electric circuit 25,
a push button 12 which would actuate solenoid valve controller 20 of solenoid valve 13 through the circuit 23;
a sump 8 for receiving and giving the hydraulic oil through ducts;
a pump 7 for pumping hydraulic oil back to cylinders 1 through ducts on restoration of electricity;
a solenoid valve 13 for controlling the flow of hydraulic oil from the sump 8;
a second solenoid valve 14 for controlling the flow of hydraulic oil to the cylinders 1 from the sump 8 through the pump 7;
an electric circuit 23 means for controlling solenoid valve controller 20 of solenoid valve 13 by push button 12 and proximity sensor 11;
a second electric circuit 24 means for controlling solenoid valve controller 21 of solenoid valve 14 by main electric pulse and proximity sensor 18;
a third electric circuit 25 means for diverting the main power supply from main motor 22 to the pump 7 and return the power back to main pulling motor 22, after the elevator cabin 19 reaches back to its original position,
a two piston-cylinder (2,1) arrangement which connects the elevator head 5 to the elevator cabin 19 and cause the elevator to move to the immediate lower floor in the absence of main power supply, after the system is activated by a push button 12.

2. A device as claimed in claim 1 wherein the said piston -cylinder arrangement is a pair of hydraulic cylinder set.
3. A device as claimed in claim 1 wherein the said push button arrangement is a push button as used on a computer keyboard that will generate a pulse and come back to its original position.
4. A device as claimed in claim 1 wherein the said proximity sensor is a magnetic proximity sensor that will generate electric signal .

5. A device as claimed in claim 1 wherein the said solenoid valve controllers are solenoid valve controllers appropriately programmed to convert input signal to the desired output signal for controlling the said solenoid valve.
6. A device as claimed in claim 1 wherein the said solenoid valves are normally closed solenoid valves operated by the solenoid valve controllers , by an input signal and opening and closing in the presence and absence signal provided by the solenoid valve controller to allow or stop the flow of hydraulic oil in the hydraulic circuit.
7. A device as claimed in claim 1 wherein the said circuit 25 to cut off the power supply to the main motor and divert the power supply to the pump 7 and again divert the power supply to the main motor 22 when the detached cabin 19 returns back to it original position.
Dated 26 the day of March 2004

Documents:

372-MUM-2004-ABSTRACT 7-8-2008.pdf

372-mum-2004-abstract(7-8-2008).pdf

372-mum-2004-abstract(7-8-2008).pdf.doc

372-mum-2004-abstract(granted)-(29-9-2008).pdf

372-MUM-2004-CANCELLED PAGES 22-3-2005.pdf

372-MUM-2004-CLAIMS 7-8-2008.pdf

372-mum-2004-claims(complete)-(22-3-2005).pdf

372-mum-2004-claims(granted)-(29-9-2008).pdf

372-mum-2004-claims(granted)-(7-8-2008).pdf.doc

372-MUM-2004-CORRESPONDENCE 7-8-2008.pdf

372-mum-2004-correspondence(7-8-2008).pdf

372-mum-2004-correspondence(ipo) 5-10-2007.pdf

372-mum-2004-correspondence(ipo)-(20-10-2008).pdf

372-MUM-2004-DESCRIPTION(COMPLETE) 7-8-2008.pdf

372-mum-2004-description(complete)-(22-3-2005).pdf

372-mum-2004-description(granted)-(29-9-2008).pdf

372-mum-2004-description(provisional)-(26-3-2004).pdf

372-MUM-2004-DRAWING 7-8-2008.pdf

372-mum-2004-drawing(7-8-2008).pdf

372-mum-2004-drawing(complete)-(22-3-2005).pdf

372-mum-2004-drawing(granted)-(29-9-2008).pdf

372-mum-2004-drawing(provisional)-(26-3-2004).pdf

372-MUM-2004-FORM 1 26-3-2004.pdf

372-MUM-2004-FORM 1 7-8-2008.pdf

372-mum-2004-form 13(26-12-2006).pdf

372-mum-2004-form 18(26-12-2006).pdf

372-mum-2004-form 2 7-8-2008.pdf

372-mum-2004-form 2(complete)-(22-3-2005).pdf

372-mum-2004-form 2(granted)-(29-9-2008).pdf

372-mum-2004-form 2(granted)-(7-8-2008).pdf.doc

372-mum-2004-form 2(provisional)-(26-3-2004).pdf

372-MUM-2004-FORM 2(TITLE PAGE) 7-8-2008.pdf

372-mum-2004-form 2(title page)-(complete)-(22-3-2005).pdf

372-mum-2004-form 2(title page)-(granted)-(29-9-2008).pdf

372-mum-2004-form 2(title page)-(provisional)-(26-3-2004).pdf

372-mum-2004-form 3(26-3-2004).pdf

372-mum-2004-form 5(22-3-2005).pdf

372-mum-2004-specification(amended)-(7-8-2008).pdf

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Patent Number

224098

Indian Patent Application Number

372/MUM/2004

PG Journal Number

06/2009

Publication Date

06-Feb-2009

Grant Date

29-Sep-2008

Date of Filing

26-Mar-2004

Name of Patentee

ASHISH BHARDWAJ

Applicant Address

H NO.3, GOLDEN LANE, OPPOSITE JANTA FLOUR MILLS, GANGYAL, JAMMU, J&K-180010

Inventors:

#	Inventor's Name	Inventor's Address
1	ASHISH BHARDWAJ	H NO.3, GOLDEN LANE, OPPOSITE JANTA FLOUR MILLS, GANGYAL, JAMMU, J&K-180010
2	RASHMI MORAB	H NO.3, GOLDEN LANE, OPPOSITE JANTA FLOUR MILLS, GANGYAL, JAMMU, J&K-180010.

PCT International Classification Number

B66B5/02

PCT International Application Number

N/A

PCT International Filing date

PCT Conventions:

#	PCT Application Number	Date of Convention	Priority Country
1			NA