Indian Patents. 211502:AN AUTOMATIC ELECTRONIC DEVICE FOR DETECTING LPG LEAK/FLAME FAILURE AND STOPING THE GAS SUPPLY

Title of Invention	AN AUTOMATIC ELECTRONIC DEVICE FOR DETECTING LPG LEAK/FLAME FAILURE AND STOPING THE GAS SUPPLY
Abstract	Automatic electronic device for detecting gas leakage comprising a sensor corinected to an electrical signal amplifier electronic circuit (ECT)T pressure sensing wheel mechanism and a current distributing electronic circuit (EC4), heat sensing switch and auto gas stopping mechanism.

Full Text	FORM- 2 PATENT ACT-1970 COMPLETE-SPECIFICATION 1. An automatic electronic device for detecting L.P.G. leakage / flame failure and stopping the gas supply. 2. RAJENDRA SINGH CHAIJHAN resident of LIG-16, kotra sultanabad, Bhopal-462003, Madhya pradesh state, India. 3. The following specification particularly describes and ascertains the nature of this invention and manner in which it is to be performed. GRANTED 7-7-2004 7 JUL 2004 This invention relates to an improvement in or modification of my main patent application number 33/BOM/89 dated 8/2/89 and further improvement and modificatioln suTmutted on 2-5-91 The invention described and illustrated in my main patent application number 33/BOM/89 dated 8/2/89 relates to an Automatic electronic device for detecting L.P.G. leakage / flame failure and slopping the gas supply, which mainly comprise sensor consisting of a sensor chip withelectronic circuit, for sensing the electrical charges from the mo]ecules of the flowing / leakinjg gas in a L.P.G appliance: a second electroni circuit consisting of a press switch, a magnetic relay connected to audio / visual alarm for giving audio / and or visual alarm when gas molecules are passing through the sensor chip of the sensor: a third electronic circuit consisting of heat and/ or light sensing switch connected to the electromagnet provided in the magnetic relay of the second electronic circuit, for stopping the working of audio / and or visual alarm when flame appears on the burner and an automatic gas supply stopping mechanism for automatically stopping the gas supply, in case the audio/ and or visual alarm indicating the gas leakage , continue for a pre-determined time. The invention described and illustrated in my main patent application number 33/BOM/89 dated 8-2-89 relates to an automatic electronic device for detecting L.P.G. leakage / flame failure and stopping the gas supply, which mainly comprise sensor (1) consisting of a sensor chip with electronic circuit, for sensing the electrical charges from the molecule of the flowing / leaking gas in a L.P.G. appliance: (EC4) electronic circuit consisting of a press switch connected to heat sensing switch through a electronic circuit for stopping the working of audio / and or visual alarm when flame appears on burner and an automatic gas supply stopping mechanism for automatically stopping the gas supply , in case the audio/ and or visual alarm indicating the gas leakage, continue for a pre-determined time. According to this invention and modification / improvement of my main invention, the second modification / improvements lies in sensor (1), (ECl) electronic circuit, (EC4) electronic circuit and automatic gas supply stopping mechanism (10) to make it more simple, sensitive, efficient and economic. The modifications / improvements according to this invention will be clear from the following description when read along with my main invention in patent application No. 33/BOM/89 dated 8-2-89 In the drawing accompanying all the feature in common with the main invention and last incorporated modification/ improvement have been given the same numerals, only the improved or modified features have been indicated by separate numerals. Figure (1) of the accompanying drawing shows schematic diagram of an automatic electronic device for detecting L.P.G. leakage / flame failure and stopping the gas supply, incorporating the improvements / modifications according to this invention Referring to figure (1) an automatic electronic device for detecting L.P.G leakage / flame failure and stopping the gas supply, comprises sensor (1) for sensing the electrical charges from the molecules of flowing / leaking gas in a L.P.G. appliance and or gas supply pipe. The sensor (1) is fixed at any desired place such as out let nozzle of L.P.G. regulator, rubber tube and its joints or the gas supply pipe of hot plate. The sensor (1) consists of sensor chip (2) which has an electronic circuit (ECl) comprising of resistances Rl, R2, R3, and a integrated circuit (IC1), an electrical charge collection means from the gas molecules such as tin di-oxide plate (3) which collects electrical charges from the gas molecules of flowing / leaking gas and triggers electronic circuit ECl to switch on full load (6 to 9 volts) DC power supply to the device through DC eliminator (known type) or batteries (el). A pressure sensing wheel mechanism (4), is housed in the nut (NT), consists of wheel (wl) and (w2), link (7), pivot point (8), shaft (SI), spring (SPl) plate (PLl) and plate (PL2), one end of the spring (SPl) is fixed in to nut (NT) at point (a) while other end of spring (SPl) is fixed at point (b) of link-(7). When diaphragm (S) fluctuates with varying gas pressure the plate (PL2)on shaft (S1) pushes wheel (w2) which turns wheel (w3) and pointer (PTI) attached to wheel (w3) makes electrical contact between insulated tooth of wheel (wl), the link (7) attached to wheel (w2) and pivoted at point (8) moves and puts spring (SPl) in tension, this pressure sensing wheel mechanism (4), is to control and regulate the power requirement of device and gas leak sensitivity with the help of diaphragm (5) fluctuating with the flowing/ leaking gas pressure. Maximum area of tin di-oxide plate (3), attached to diaphragm (5), get exposed to leaking / flowing gas at different pressure to collect constant charge from gas molecules. The DC power supply switched on by electronic circuit EC1 now reaches to a single modified electronic circuit (EC4) which comprises a electronic circuit (9) consisting a press switch (known type) a (IC2), resistance (R7) and (R8) to distribute the current and to disconnect audio (B) and visual (L1) and to connect flame indication light lamp (L2) with the help of a Mechanism (Me) of the heat-sensing switch (HSS1), when gas is ignited at burner during normal use. The said heat sensing switch (HSS1) which comprises a body (BO) housing in it a mechanism (Me). The said mechanism (Me) consisting of a heat sensing Bi-metallic strip (BM1) whose one end (Al) is fixed at the end (A2) of a swing shaft (SW1) and its other end (Bl) is kept pressed against the body (BO) by giving it a parabolic or any other shape. The said swing shaft (SW1), at its center, pivotally mounted on a pin (Pn) whose two ends (A3) and (B3) are supported in to the body (BO) a moving electrical contact (P7) and one end of a spring (SP) is fixed at end (B2) of swing shaft (SW1) and other end of the spring (SP) is fixed in to the body (BO) and kept in tension so the moving electrical contact point (P7) is in contact with Affixed electrical contact point (P8) in normal condition. The said electrical contact point (P8) provides electrical signal to (IC2) of electronic circuit (EC4) which is further connected to audio (BO) and /or Visual (L1) alarm and light lamp (L2) through resistances (R4), (R5), (R6) and (R7) and a diode (D1) to indicate the leak of gas, when gas molecules are passing through sensor chip (2) in sensor (1) i je. either the gas is leaking or flowing for normal use. In case when gas is ignited at burner for normal use, the heat of flame, appeared on burner, is provided to heat sensing Bi-metallic bend strip (BM1), whose one end ((B1) kept pressed against body (BO), moves away from body (BO) by its bending action due to heat of flame so the spring (SP) drags end (B2) of swing shaft (SWl) and turn it on pin (Pn) thus the moving electrical contact point (P7) disconnects fixed electrical contact point (P8) which provides electrical signal to (IC2) to change the out put electrical polarity of (IC2) to stop the function of audio(B)and/or visual (Ll)alarm and to start the function of flame indication light lamp (L2) shows gas is ignited at burner . The function of heat sensing Bi-metallic bend strip (BM1) is shown by dotted lines. (BM1) In case of failure of flame at burner, the heat sensing Bi-metallic bend strip (BM1) will not receive heat of the flame, and start to cool so its end (Bl) will start to bend back to words the body (BO) and puts spring (SP) back in tension and turn the swing shaft (SWl) on pin (Pn) thus the end.(B2) of swing shaft (SWl) moves and moving electrical point (P7) makes contact with fixed electrical point (P8) which again provides electrical signal to (IC2) to cliange out put electrical polarity of (IC2) to stop the function of the flame indication light lamp (L2) and to start function of the audio(B) and/or visual (L1) alarm, indicating gas is leaking/flowing from burner. An electronic timer (JET), known type, is connected to audio (B) and / or visual (L1) alarm at point (01) and in case of continuous audio visual alarm signals for a predetermined time, say 15 seconds, indicating a continuous leak of gas either from L.P.G. installation or from burner or due to failure of flame at burner, the current passes through electronic timer (ET) to a electro-magnet (EM2) of a solenoid, known type, of an automatic gas supply stopping mechanism (10) to stop the supply of gas to hot plate. The automatic gas supply stopping mechanism (10) housed in a body of two plates (CP1) and (CP2) and consisting in it a solenoid, known type, having an electro-magnet (EM2), a shaft (SS) And a spring (SSP2), a shaft (SHI) mounting on it gear (Gl), pin (Pn3), knob (KB1), knob (KB2) covers the knob (KB3) of regulator (Rg) mounted on gas cylinder (GC), a spiral spring (CS3) whose one end (El) is fixed on plate (CP1) and other end is fixed on the shaft (SHI), a shaft (SH2) mounting on it gear (G2) and (G3), shaft (SH3) mounting on it pins (Pnl) and (Pn2) and a leaf switch, known type having two strip (ST1) and (ST2) with electrical contact points (EP1) and (EP2). In the said automatic gas supply stopping mechanism (10), the gear (Gl) is kept engaged with gear (G2) and the knob (KB 1) fixed at the end (A4) of shaft (SHI) is to turn the shaft (SHI) and to put spring (CS3) in tension which also to turn regulator knob (KB3) to on position for the gas supply, at this time the pin (Pnl) locks with ratchet gear (G3) and pin (Pn3) is stopped by solenoid shaft (SS). The current so passed by electronic timer (ET) to electro-magnet (EM2) of solenoid, known type, creates electromagnetic force, which pulls shaft (SS) and releases the pin (Pn2) and so the pin (Pnl) turns on shaft (SH3) to UN locks the ratchet gear (G3). The gear (G2) mounted on the (SH2) rotates so the gear(Gl) and shaft (SHI) rotates to release the tension of spring (CS3) and closes the regulator knob to stop the supply of gas to L.P.G. installation. The said automatic gas supply stopping mechanism (10) is apart of a cover (18) and knob (KB1) is to operate the mechanism, manually, from outside of cover (18) when it is fixed at the neck of L.P.G. cylinder (GC) enclosing the regulator (Rg). The said cover (18) is of removable type and became gas tight when fixed at L.P.G. Cylinder (CG) A pressure sensor (PS) is provided inside of cover (18) comprises a diaphragm (19) and a press switch (200, known type, The said press switch (20) is having two electrical contact points (P10) and (P11), where in point (PI 1) is connected to dry battery cells (e2) and point (P10) is connected to point (01) to audio (B) and / or visual (LI) through resistance (R5) and (R6). The leaked gas from L.P.G. cylinder (GC) and regulator (Rg) joint get trapped and collected in side of cover (18), exerts pressure on diaphragm (19) to press the point (PI 1) of press switch (20), to contact point (P10),thus the DC power supplied by-dry-battery cell(e2) passes-to audio (B) and/or visual (L1) alarm to indicate the leak of gas. The above description with references to fig (1) is only given to understand the invention and improvements and or modifications rather than to limit its scope, as various modifications are possible with in the scope of this Jnvention, some of them are press switch(9)heat sensing" switch (HSS1) and electronic circuit (EC4) may vary in its number according to the number of burners in a L.P.G. appliance, similarly dry battery cells (e2) can be dispense with and pressure sensor (PS) can be connected through batteries (el) however press switch (9) can be eliminated for single burner L.P.G. appliance as current distribution is not required and DC current \| distribution directly be given to (IC2)from sensor(l). 1 CLAIM ) 1 Automatic electronic device for detecting gas leakage comprising a sensor corinected to an electrical signal amplifier electronic circuit (ECT)T pressure sensing wheel mechanism and a current distributing electronic circuit (EC4), heat sensing switch and auto gas stopping mechanism. 2. Automatic electronic device claim (1) wherein the sensor comprises a tin di- oxide plate fixed on a diaphragm. 3. Automatic electronic device of claim (1) wherein the electronic circuit EC (1) comprises integrated circuit IC1 and resistances Rl, R2 and R3. 4. Automatic electronic device of claim (1) wherein pressure sensing wheel mechanism consists of wheels Wl, W2 and W3, link7, pivot point 8,shaftSl, sprang SP1 and plate PL 1, PL2 and a pointer PT1. 5. Automatic electronic device of claim (1) wherein electronic circuit (EC4) consisting of a press switch with two electrical points P2 and P3 connected to integrated circuit (IC2), out put point CS of (IC2) is connected to audio (B) and or visual alarm (LI) through resistances R.7, point C3 of (IC2) is connected to heat sensing switch (HSS1) 6. Automatic electronic device of claim (1) or (5) where in heat sensing switch (HSS1) consisting of heat sensing bimetallic bend strip (BM1) whose end (Al) is fixed at end (A2) of a swing shaft (SW1) pivotally mounted on a pin (Pn) whose two ends (A3) and (B3) are in to a body ((BO) and one end (Bl) of heat sensing bimetallic strip (BM1) which is kept pressed against body (BO), one end of spring (SP) and moving electrical contact point (P7) are fixed at the end (B2) of swing shaft (SWl) and other end of the spring (SP) is fixed to the body (BO) of heat sensing switch (HSS1) and the audio (B) and /or visual (LI) is connected to auto gas stopping mechanism(10) through a electronic timer (ET) 7. Automatic electronic device of claim (1) or (6) wherein the auto gas stopping mechanism consisting of a shaft (SH1) mounted on a gear (Gl), spiral spring (CS3), pin (Pn3) with knobs (KN1) and (KN2), shaft (SH2) is mounted on a gear (G2) and ratchet gear (G3) while shaft (SH3) is mounted on pins (PNl) and (PN2), ends of these shafts (SHI), (SH2) and(SH3) are having bearing supports on plates (CP1) and(CP2), a solenoid having electromagnet (EM2) and (ST2) and electrical contact points (EP1) and (EP2) are Tixed on plates (CP1) and (CP2) 8. Automatic electronic device of claim (1) wherein auto gas stopping mechanism is constructed as an independent unit or part of cover (18) 9. Automatic electronic device of claim (1) or (4) wherein pressure sensing wheel mechanism is housed in a hollow nut (NT1) 10. Automatic electronic device substantially as herein defined and illustrated in the accompanying drawings Dated 6th day of July, 2004 (Rajendra Singh Chauhan)

Full Text

FORM- 2
PATENT ACT-1970
COMPLETE-SPECIFICATION
1. An automatic electronic device for detecting L.P.G. leakage / flame failure and stopping the gas supply.
2. RAJENDRA SINGH CHAIJHAN resident of LIG-16, kotra sultanabad, Bhopal-462003, Madhya pradesh state, India.
3. The following specification particularly describes and ascertains the nature of this invention and manner in which it is to be performed.
GRANTED
7-7-2004

7 JUL 2004

This invention relates to an improvement in or modification of my main patent application number 33/BOM/89 dated 8/2/89 and further improvement and modificatioln suTmutted on 2-5-91
The invention described and illustrated in my main patent application number 33/BOM/89 dated 8/2/89 relates to an Automatic electronic device for detecting L.P.G. leakage / flame failure and slopping the gas supply, which mainly comprise sensor consisting of a sensor chip withelectronic circuit, for sensing the electrical charges from the mo]ecules of the flowing / leakinjg gas in a L.P.G appliance: a second electroni circuit consisting of a press switch, a magnetic relay connected to audio / visual alarm for giving audio / and or visual alarm when gas molecules are passing through the sensor chip of the sensor: a third electronic circuit consisting of heat and/ or light sensing switch connected to the electromagnet provided in the magnetic relay of the second electronic circuit, for stopping the working of audio / and or visual alarm when flame appears on the burner and an automatic gas supply stopping mechanism for automatically stopping the gas supply, in case the audio/ and or visual alarm indicating the gas leakage , continue for a pre-determined time.
The invention described and illustrated in my main patent application number 33/BOM/89
dated 8-2-89 relates to an automatic electronic device for detecting L.P.G. leakage / flame
failure and stopping the gas supply, which mainly comprise sensor (1) consisting of a sensor
chip with electronic circuit, for sensing the electrical charges from the molecule of the
flowing / leaking gas in a L.P.G. appliance: (EC4) electronic circuit consisting of a press
switch connected to heat sensing switch through a electronic circuit for stopping the
working of audio / and or visual alarm when flame appears on burner and an automatic gas
supply stopping mechanism for automatically stopping the gas supply , in case the audio/ and
or visual alarm indicating the gas leakage, continue for a pre-determined time.
According to this invention and modification / improvement of my main invention, the second modification / improvements lies in sensor (1), (ECl) electronic circuit, (EC4)
electronic circuit and automatic gas supply stopping mechanism (10) to make it more simple,
sensitive, efficient and economic.
The modifications / improvements according to this invention will be clear from the following
description when read along with my main invention in patent application No. 33/BOM/89 dated
8-2-89 In the drawing accompanying all the feature in common with the main invention and last
incorporated modification/ improvement have been given the same numerals, only the improved
or modified features have been indicated by separate numerals.

Figure (1) of the accompanying drawing shows schematic diagram of an automatic electronic device for detecting L.P.G. leakage / flame failure and stopping the gas supply, incorporating the improvements / modifications according to this invention
Referring to figure (1) an automatic electronic device for detecting L.P.G leakage / flame failure and stopping the gas supply, comprises sensor (1) for sensing the electrical charges from the molecules of flowing / leaking gas in a L.P.G. appliance and or gas supply pipe. The sensor (1) is fixed at any desired place such as out let nozzle of L.P.G. regulator, rubber tube and its joints or the gas supply pipe of hot plate.
The sensor (1) consists of sensor chip (2) which has an electronic circuit (ECl) comprising of resistances Rl, R2, R3, and a integrated circuit (IC1), an electrical charge collection means from the gas molecules such as tin di-oxide plate (3) which collects electrical charges from the gas molecules of flowing / leaking gas and triggers electronic circuit ECl to switch on full load (6 to 9 volts) DC power supply to the device through DC eliminator (known type) or batteries (el).
A pressure sensing wheel mechanism (4), is housed in the nut (NT), consists of wheel (wl) and (w2), link (7), pivot point (8), shaft (SI), spring (SPl) plate (PLl) and plate (PL2), one end of the spring (SPl) is fixed in to nut (NT) at point (a) while other end of spring (SPl) is fixed at
point (b) of link-(7). When diaphragm (S) fluctuates with varying gas pressure the plate (PL2)on
shaft (S1) pushes wheel (w2) which turns wheel (w3) and pointer (PTI) attached to wheel (w3) makes electrical contact between insulated tooth of wheel (wl), the link (7) attached to wheel (w2) and pivoted at point (8) moves and puts spring (SPl) in tension, this pressure sensing wheel mechanism (4), is to control and regulate the power requirement of device and gas leak sensitivity with the help of diaphragm (5) fluctuating with the flowing/ leaking gas pressure. Maximum area of tin di-oxide plate (3), attached to diaphragm (5), get exposed to leaking / flowing gas at different pressure to collect constant charge from gas molecules.
The DC power supply switched on by electronic circuit EC1 now reaches to a single modified electronic circuit (EC4) which comprises a electronic circuit (9) consisting a press switch (known type) a (IC2), resistance (R7) and (R8) to distribute the current and to disconnect audio (B) and visual (L1) and to connect flame indication light lamp (L2) with the help of a
Mechanism (Me) of the heat-sensing switch (HSS1), when gas is ignited at burner during normal use.
The said heat sensing switch (HSS1) which comprises a body (BO) housing in it a mechanism (Me). The said mechanism (Me) consisting of a heat sensing Bi-metallic strip (BM1) whose one end (Al) is fixed at the end (A2) of a swing shaft (SW1) and its other end (Bl) is kept pressed against the body (BO) by giving it a parabolic or any other shape.
The said swing shaft (SW1), at its center, pivotally mounted on a pin (Pn) whose two ends (A3) and (B3) are supported in to the body (BO) a moving electrical contact (P7) and one end of a spring (SP) is fixed at end (B2) of swing shaft (SW1) and other end of the spring (SP) is fixed in to the body (BO) and kept in tension so the moving electrical contact point (P7) is in contact with

Affixed electrical contact point (P8) in normal condition. The said electrical contact point (P8) provides electrical signal to (IC2) of electronic circuit (EC4) which is further connected to audio (BO) and /or Visual (L1) alarm and light lamp (L2) through resistances (R4), (R5), (R6) and (R7) and a diode (D1) to indicate the leak of gas, when gas molecules are passing through sensor chip (2) in sensor (1) i je. either the gas is leaking or flowing for normal use.
In case when gas is ignited at burner for normal use, the heat of flame, appeared on burner, is provided to heat sensing Bi-metallic bend strip (BM1), whose one end ((B1) kept pressed against body (BO), moves away from body (BO) by its bending action due to heat of flame so the spring (SP) drags end (B2) of swing shaft (SWl) and turn it on pin (Pn) thus the moving electrical contact point (P7) disconnects fixed electrical contact point (P8) which provides electrical signal to (IC2) to change the out put electrical polarity of (IC2) to stop the function of audio(B)and/or visual (Ll)alarm and to start the function of flame indication light lamp (L2) shows gas is ignited at burner . The function of heat sensing Bi-metallic bend strip (BM1) is shown by dotted lines. (BM1)
In case of failure of flame at burner, the heat sensing Bi-metallic bend strip (BM1) will not receive heat of the flame, and start to cool so its end (Bl) will start to bend back to words the body (BO) and puts spring (SP) back in tension and turn the swing shaft (SWl) on pin (Pn) thus the end.(B2) of swing shaft (SWl) moves and moving electrical point (P7) makes contact with fixed electrical point (P8) which again provides electrical signal to (IC2) to cliange out put electrical polarity of (IC2) to stop the function of the flame indication light lamp (L2) and to start function of the audio(B) and/or visual (L1) alarm, indicating gas is leaking/flowing from burner.
An electronic timer (JET), known type, is connected to audio (B) and / or visual (L1) alarm at point (01) and in case of continuous audio visual alarm signals for a predetermined time, say 15 seconds, indicating a continuous leak of gas either from L.P.G. installation or from burner or due to failure of flame at burner, the current passes through electronic timer (ET) to a electro-magnet (EM2) of a solenoid, known type, of an automatic gas supply stopping mechanism (10) to stop the supply of gas to hot plate.
The automatic gas supply stopping mechanism (10) housed in a body of two plates (CP1) and (CP2) and consisting in it a solenoid, known type, having an electro-magnet (EM2), a shaft (SS)
And a spring (SSP2), a shaft (SHI) mounting on it gear (Gl), pin (Pn3), knob (KB1), knob (KB2) covers the knob (KB3) of regulator (Rg) mounted on gas cylinder (GC), a spiral spring (CS3) whose one end (El) is fixed on plate (CP1) and other end is fixed on the shaft (SHI), a shaft (SH2) mounting on it gear (G2) and (G3), shaft (SH3) mounting on it pins (Pnl) and (Pn2) and a leaf switch, known type having two strip (ST1) and (ST2) with electrical contact points (EP1) and (EP2).
In the said automatic gas supply stopping mechanism (10), the gear (Gl) is kept engaged with gear (G2) and the knob (KB 1) fixed at the end (A4) of shaft (SHI) is to turn the shaft (SHI) and to put spring (CS3) in tension which also to turn regulator knob (KB3) to on position for the gas supply, at this time the pin (Pnl) locks with ratchet gear (G3) and pin (Pn3) is stopped by solenoid shaft (SS).

The current so passed by electronic timer (ET) to electro-magnet (EM2) of solenoid, known type, creates electromagnetic force, which pulls shaft (SS) and releases the pin (Pn2) and so the pin (Pnl) turns on shaft (SH3) to UN locks the ratchet gear (G3). The gear (G2) mounted on the (SH2) rotates so the gear(Gl) and shaft (SHI) rotates to release the tension of spring (CS3) and closes the regulator knob to stop the supply of gas to L.P.G. installation.
The said automatic gas supply stopping mechanism (10) is apart of a cover (18) and knob (KB1) is to operate the mechanism, manually, from outside of cover (18) when it is fixed at the neck of L.P.G. cylinder (GC) enclosing the regulator (Rg).
The said cover (18) is of removable type and became gas tight when fixed at L.P.G. Cylinder (CG)
A pressure sensor (PS) is provided inside of cover (18) comprises a diaphragm (19) and a press switch (200, known type, The said press switch (20) is having two electrical contact points (P10) and (P11), where in point (PI 1) is connected to dry battery cells (e2) and point (P10) is connected to point (01) to audio (B) and / or visual (LI) through resistance (R5) and (R6). The leaked gas from L.P.G. cylinder (GC) and regulator (Rg) joint get trapped and collected in side of cover (18), exerts pressure on diaphragm (19) to press the point (PI 1) of press switch (20), to contact point (P10),thus the DC power supplied by-dry-battery cell(e2) passes-to audio (B) and/or visual (L1) alarm to indicate the leak of gas.
The above description with references to fig (1) is only given to understand the invention and improvements and or modifications rather than to limit its scope, as various modifications are possible with in the scope of this Jnvention, some of them are press switch(9)heat sensing" switch (HSS1) and electronic circuit (EC4) may vary in its number according to the number of burners in a L.P.G. appliance, similarly dry battery cells (e2) can be dispense with and pressure sensor (PS) can be connected through batteries (el) however press switch (9) can be eliminated for single burner L.P.G. appliance as current distribution is not required and DC current |
distribution directly be given to (IC2)from sensor(l).

1 CLAIM )

1 Automatic electronic device for detecting gas leakage comprising a sensor corinected to
an electrical signal amplifier electronic circuit (ECT)T pressure sensing wheel mechanism
and a current distributing electronic circuit (EC4), heat sensing switch and auto gas
stopping mechanism.
2. Automatic electronic device claim (1) wherein the sensor comprises a tin di- oxide plate fixed on a diaphragm.
3. Automatic electronic device of claim (1) wherein the electronic circuit EC (1) comprises integrated circuit IC1 and resistances Rl, R2 and R3.
4. Automatic electronic device of claim (1) wherein pressure sensing wheel mechanism consists of wheels Wl, W2 and W3, link7, pivot point 8,shaftSl, sprang SP1 and plate PL 1, PL2 and a pointer PT1.

5. Automatic electronic device of claim (1) wherein electronic circuit (EC4) consisting of a press switch with two electrical points P2 and P3 connected to integrated circuit (IC2), out put point CS of (IC2) is connected to audio (B) and or visual alarm (LI) through resistances R.7, point C3 of (IC2) is connected to heat sensing switch (HSS1)
6. Automatic electronic device of claim (1) or (5) where in heat sensing switch (HSS1) consisting of heat sensing bimetallic bend strip (BM1) whose end (Al) is fixed at end (A2) of a swing shaft (SW1) pivotally mounted on a pin (Pn) whose two ends (A3) and (B3) are in to a body ((BO) and one end (Bl) of heat sensing bimetallic strip (BM1) which is kept pressed against body (BO), one end of spring (SP) and moving electrical contact point (P7) are fixed at the end (B2) of swing shaft (SWl) and other end of the spring (SP) is fixed to the body (BO) of heat sensing switch (HSS1) and the audio (B) and /or visual (LI) is connected to auto gas stopping mechanism(10) through a electronic timer (ET)
7. Automatic electronic device of claim (1) or (6) wherein the auto gas stopping mechanism consisting of a shaft (SH1) mounted on a gear (Gl), spiral spring (CS3), pin (Pn3) with knobs (KN1) and (KN2), shaft (SH2) is mounted on a gear (G2) and ratchet gear (G3) while shaft (SH3) is mounted on pins (PNl) and (PN2), ends of these shafts (SHI), (SH2) and(SH3) are having bearing supports on plates (CP1) and(CP2), a solenoid having electromagnet (EM2) and (ST2) and electrical contact points (EP1) and (EP2) are Tixed on plates (CP1) and (CP2)
8. Automatic electronic device of claim (1) wherein auto gas stopping mechanism is constructed as an independent unit or part of cover (18)
9. Automatic electronic device of claim (1) or (4) wherein pressure sensing wheel mechanism is housed in a hollow nut (NT1)
10. Automatic electronic device substantially as herein defined and illustrated in the accompanying drawings
Dated 6th day of July, 2004
(Rajendra Singh Chauhan)

Documents:

723-mum-2004-cancelled pages(7-7-2004).pdf

723-mum-2004-claims(granted)-(7-7-2004).pdf

723-mum-2004-correspondence(ipo)-(20-9-2005).pdf

723-mum-2004-drawing(7-7-2004).pdf

723-mum-2004-form 1(7-7-2004).pdf

723-mum-2004-form 19(7-7-2004).pdf

723-mum-2004-form 2(granted)-(7-7-2004).pdf

723-mum-2004-form 3(7-7-2004).pdf

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Patent Number

211502

Indian Patent Application Number

723/MUM/2004

PG Journal Number

40/2008

Publication Date

03-Oct-2008

Grant Date

01-Nov-2007

Date of Filing

07-Jul-2004

Name of Patentee

RAJENDRA SINGH CHAUHAN

Applicant Address

LIG-16, KOTRA SULTANABAD, BHOPAL,

Inventors:

#	Inventor's Name	Inventor's Address
1	RAJENDRA SINGH CHAUHAN	LIG-16, KOTRA SULTANABAD, BHOPAL 462003,

PCT International Classification Number

F02D 41/00

PCT International Application Number

N/A

PCT International Filing date

PCT Conventions:

#	PCT Application Number	Date of Convention	Priority Country
1			NA