CA1160137A - Valve and its utilisation - Google Patents
Valve and its utilisationInfo
- Publication number
- CA1160137A CA1160137A CA000374479A CA374479A CA1160137A CA 1160137 A CA1160137 A CA 1160137A CA 000374479 A CA000374479 A CA 000374479A CA 374479 A CA374479 A CA 374479A CA 1160137 A CA1160137 A CA 1160137A
- Authority
- CA
- Canada
- Prior art keywords
- valve
- valve member
- pressure
- housing
- chamber
- 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.)
- Expired
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C23/00—Devices for measuring, signalling, controlling, or distributing tyre pressure or temperature, specially adapted for mounting on vehicles; Arrangement of tyre inflating devices on vehicles, e.g. of pumps or of tanks; Tyre cooling arrangements
- B60C23/001—Devices for manually or automatically controlling or distributing tyre pressure whilst the vehicle is moving
- B60C23/004—Devices for manually or automatically controlling or distributing tyre pressure whilst the vehicle is moving the control being done on the wheel, e.g. using a wheel-mounted reservoir
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C23/00—Devices for measuring, signalling, controlling, or distributing tyre pressure or temperature, specially adapted for mounting on vehicles; Arrangement of tyre inflating devices on vehicles, e.g. of pumps or of tanks; Tyre cooling arrangements
- B60C23/005—Devices specially adapted for special wheel arrangements
- B60C23/007—Devices specially adapted for special wheel arrangements having multiple wheels arranged side by side
Abstract
ABSTRACT OF THE DISCLOSURE
The present invention provides a valve having a valve member which is biassed against a valve seat by means of a spring. In the open position the valve member rests against a detent. In order to be able to adjust the closing pressure more exactly and to reduce the closing interval, the valve member or the housing is provided with a magnet which interacts with a ferromagnetic detent at the housing or valve member.
The arrangement is such that when the valve member is closed the magnet at least approximately abuts the ferromagnetic detent and when the valve member is open the magnet is spaced therefrom by a distance at which the biassing force of the magnet is smaller than that of the spring.
The present invention provides a valve having a valve member which is biassed against a valve seat by means of a spring. In the open position the valve member rests against a detent. In order to be able to adjust the closing pressure more exactly and to reduce the closing interval, the valve member or the housing is provided with a magnet which interacts with a ferromagnetic detent at the housing or valve member.
The arrangement is such that when the valve member is closed the magnet at least approximately abuts the ferromagnetic detent and when the valve member is open the magnet is spaced therefrom by a distance at which the biassing force of the magnet is smaller than that of the spring.
Description
1)137 The present invention relates to a valve having valve member biassed against a valve seat by a spring and which rests, in the open position, against a detent, and to the use of said valve.
Valves of this type are known, as fo~ example, in a device for equalizing and controlling the pressure in at least two pressure chambers, particularly in pneumatic tires of a vehicle according to the German Offenlegungsschrift No. 2,822,514. In this type of valve, the valve member is to open at a specific higher pressure and to close at a specific lower pressure.
However, it is disadvantageous that at low pressures and at small pressure differences of the opening and closing pressure, the valve member has inaccuracies and its ability to respond scatters to some extent.
German Paten-t No. 1,048,452 disc]oses a check valve or excess-pressure valve in which a permanent magnet is used instead of a biassing spring in order to attain the restoring force. This valve functions practically only in a vertical position at rest, otherwise the magnet can move out of the effective field of the housing and is rendered ineffective.
Furthermore, this valve is extremely sensitive to vibrations, which can cause undesired closure. This valve is absolutely unsuitable for contro]ling pneumatic tires of a vehicle.
The present invention improves the accuracy of response of the valve mentioned at the outset, particularly also in cases of low pressures and small differences of both the opening pressure and the closing pressure.
According to the present invention there is provided in a valve having valve member biassed against a valve seat by a spring and which rests, in the open position, against a detent, the improvement in which the valve member or a housing for the valve member is provided with a magnet which interacts with a ~V~L37 ferromagnetic deten-t on the housing or the valve member such that when the valve member is closed, the magnet at least approximate-ly abuts the ferromagnetic detent and when the valve member is open said magnet is spaced therefrom by a distance at which the biassing force of the magnet is smaller than that of the spring.
As soon as the valve member begins to respond, i~e., to close, when the pressure drops the attraction between the magnet and the ferromagnetic detent increases. As soon as the decrease in the biassing force of the spring caused by the closing motion of the valve member is compensated for or exceeded bv the increase in the biassina force of the magnet the valve member suddenly closes. Precise closing can thus be attained even at low pressures and small pressure differences.
The biassing force of the spring which is increased when the valve is open and the practically absent effect of the rnagnet assure that the valve is reliably kept open in any position of the valve and even at extreme vibrations, as for example, when using the valve for controlling pneumatic tires of vehicles.
In one embodiment of the present invention the space bet~een the ferromagnetic detent and the magnet is adjustable.
This design of the valve permits the adjustment of the sensitivity to respond and/or of the level of the pressure of response.
Suitably the fermagnetic detent is adjustable. Alternatively the magnet is adjustable. Yet aqain the detent of the valve may be adjustable.
The magnet may be an electromagnet, a permanent magnet being preferred. In the latter case it is particularly advantageous that the magnet is a pot-shaped magnet disposed on a rod of the valve member and said pot-shaped magnet interacts with a ferro-magnetic detent in the housing.
Particularly when the valve is exposed to frequent changes of position and vibration the rod is provided on the side of the maqnet, with a lonaitudinal quide is favourable.
The valve is suitable for the most varied purposes.
Mowever, its use is particularly favourable in a device for controlling the pressure in at least one pressure chamber the valve memker closing a pressure chamber so as to render it impervious to the medium, said pressure chamber beinq provided with a lockable supply pipe, the connecting duct of -the pressure chamber opening into the valve seat and being closable by means of the valve member and the cross-sectional area of the orifice of the connecting duct being smaller than the free area of the valve member turned towards the pressure chamber. Specifically the valve is useful such a device for the additional equalization of the pressure in at ]east two pressure chambers, all connecting ducts of the pressure chambers opening into the valve seat and being closable by means of the valve member and the sum of the cross-sectional areas of all orifices of the connecting ducts being smaller than the free area of the valve member facinc3 the pressure chamber. Suitably the pressure chamber is a set of pneumatic tires of a vehicle such a device is described, for example, in the German Offenlegungsschrift No. 2,822,514.
A practical example of the valve according to the present invention is a device for equalizinq and controlling the pressure in at least two pressure chambers, particularly in pneumatic tires of a vehicle is described in greater detail hereafter with reference to the accompanying drawings in which:
Figure 1 is a longitudinal section of a valve in the device;
~igure 2 is a plan view of the device of Figure l; and Figure 3 is a detail of the device of Figure 1 on an enlarged scale.
~L~60137 Tlle device for equ~lizing and controlling the pressure in at least two pressure chambers is provided with a valve. Said device is suitable particularly for pneumatic tires of vehicles.
The device has a pressure chamber 1 whose one wall is formed by a valve member 2, which is biassed against a valve seat 4 by means of a biassing spring 3. A supply pipe 5, which can he closed by means of a check valve 6, opens into the pressure chamber 1. Connecting ducts 7 and 8 serve for junction with the pressure - 3a -iiL~t~0~37 chamher (not shown) and are for example, pneumatic tires ofvehicles. soth the connecting duct 7 and the connecting duct 8 open into the valve seat ~. The free area of the valve member which faces the pressure chamber is substantially larger than the sum of the cross-sectional areas of the orifices 9 and 10 of the connecting ducts 7 and 8.
Referring particularly to Figure 3 the orifices9 and 10 are provided with sealing lips 11, which face the valve member 2.
Said valve member 2 is provided with a gasket 12 facing the sealing lips 11. The gasket 12 consists of an elastic material which can be displaced bv the sealing lips 11 so that a reliable seal hetween the valve member and the orifices is assured.
The valve member 2 is formed by a piston 13, which is secured to a rod ~and is taper bore mounted. The piston 13 is disposed in a cylindrical housing 15 whose bottom is divided into two regions, a first bottom region forming the valve seat 4 and a second bottom region Eorming a wall portion of the pressure chamber 1. A corrugated tube sleeve 17 serves for sealinq the piston 13 against the cy]inder wall. Said corrugated tube s]eeve 17 is disposed on the piston 13 on the one hand and via an internal ring 18 on the cylinder wall on the other so as to render it impervious to the medium. The biassing spring 3 serves for biassing the piston 13 aqainst the valve seat 4. The biassinq force of the biassing spring may be adjusted by means of a setscrew 19 screwed into the housinq 15. The opening motion of the piston 13 and thus of the valve member is limited by a detent 20, which is adiustable when re~uired.
A pot-shaped permanent magnet 21 is secured to the end of the rod 14 which it faces away from the valve member 2. Said permanent magnet 21 interacts with a ferromagnetic detent 22, which is screwed, in the form of a ring, into the housing 15.
Depending on the screwed-in depth the space X between the ~6tl 137 permanent magnet 21 and the ferromagnetlc detent 22 can be adjusted when the valve rnember 2 is open. A screw cap 23 is screwed to the end of the housing 15 and completely seals off the device.
The screw cap 23 can be provided with a pin 24, which engages a borehole 25 of the rod 14 and serves for guiding said rod. The screw cap may consist of a transparent material so that the position of the permanent magnet 21 and thus the control state of the valve can be seen.
To adjust the space X the ferromagnetic detent 22 can a]so be fixed when required and the permanent magnet 21 can be such that it is screwable on the rod in the axial direction. It is also possible to so design the detent 20 that it is adjustable in order to vary the space X.
To equalize and contro] the pressure in -the pneumatic tires of a vehicle the device may be designed, for example, as follows:- If the nominal pressure in a tire is to be, for examp]e 8 bars, the valve member 2 opens when a pressure of at least 9 bars is applied at the supply pipe 5. The valve member 2 closes as soon as the pressure in the pressure chamber 1 drops to below 7.5 bars. When the pneumatic tires are inflated -to the nominal pressure of 8 bars via the supply pipe 5, the pressure chamber 1 and the connecting ducts 7 and 8, then the valve member 2 thus remains open. When the pressure in one of the pneumatic tires drops then the valve member 2 remains open and the pressure can be equlized from one connecting duct via the pressure chamber into the other connecting duct. Only when the total pressure drops to a value lower than the nominal pressure, i.e., to lower than 8 bars in the present example, does the valve member 2 begin to close. In the first phase only the biassing force of the biassing spring 3 acts and the rod 14 with the valve member 2 is moved towards the valve seat 4. After a spring elongation of approximately 1 mm the influence of both the per~
manent magnet 21 and the detent 22 becomes effective in a second phase and the valve closes with a jolt. In the first phase the space X is so large that the permanent magnet 21 is ineffective.-Thus, there exisis no danger that, without pressure loss in the pressure chamber 1, the valve closes automatically upon a possible impact and does so independently of the position of the valve.
When the valve member 2 is closed and the pressure in one of the pneumatic tires rises again, for example, due to excessive heating, then this pressure rise cannot open the valve member 2 since the pressure applied to the valve member 2 through the cross section of the orifice acts only on an area of the valve member which corresponds to the cross section of the orifice.
Even if this pressure is substantially higher than the nominal pressure of the tire, it is high enough to open the valve member.
This thus ensures that once a valve member 2 is closed it cannot be opened by an excess pressure in the connected pressure chambers. It can be opened only by renewed supply of pressure medium via the supply pipe 5.
In case of a sudden pressure drop in one of the pressure chambers the valve member 2 closes immediately even at excess pressure.
The device is also suitable for pressures of e.g.,
Valves of this type are known, as fo~ example, in a device for equalizing and controlling the pressure in at least two pressure chambers, particularly in pneumatic tires of a vehicle according to the German Offenlegungsschrift No. 2,822,514. In this type of valve, the valve member is to open at a specific higher pressure and to close at a specific lower pressure.
However, it is disadvantageous that at low pressures and at small pressure differences of the opening and closing pressure, the valve member has inaccuracies and its ability to respond scatters to some extent.
German Paten-t No. 1,048,452 disc]oses a check valve or excess-pressure valve in which a permanent magnet is used instead of a biassing spring in order to attain the restoring force. This valve functions practically only in a vertical position at rest, otherwise the magnet can move out of the effective field of the housing and is rendered ineffective.
Furthermore, this valve is extremely sensitive to vibrations, which can cause undesired closure. This valve is absolutely unsuitable for contro]ling pneumatic tires of a vehicle.
The present invention improves the accuracy of response of the valve mentioned at the outset, particularly also in cases of low pressures and small differences of both the opening pressure and the closing pressure.
According to the present invention there is provided in a valve having valve member biassed against a valve seat by a spring and which rests, in the open position, against a detent, the improvement in which the valve member or a housing for the valve member is provided with a magnet which interacts with a ~V~L37 ferromagnetic deten-t on the housing or the valve member such that when the valve member is closed, the magnet at least approximate-ly abuts the ferromagnetic detent and when the valve member is open said magnet is spaced therefrom by a distance at which the biassing force of the magnet is smaller than that of the spring.
As soon as the valve member begins to respond, i~e., to close, when the pressure drops the attraction between the magnet and the ferromagnetic detent increases. As soon as the decrease in the biassing force of the spring caused by the closing motion of the valve member is compensated for or exceeded bv the increase in the biassina force of the magnet the valve member suddenly closes. Precise closing can thus be attained even at low pressures and small pressure differences.
The biassing force of the spring which is increased when the valve is open and the practically absent effect of the rnagnet assure that the valve is reliably kept open in any position of the valve and even at extreme vibrations, as for example, when using the valve for controlling pneumatic tires of vehicles.
In one embodiment of the present invention the space bet~een the ferromagnetic detent and the magnet is adjustable.
This design of the valve permits the adjustment of the sensitivity to respond and/or of the level of the pressure of response.
Suitably the fermagnetic detent is adjustable. Alternatively the magnet is adjustable. Yet aqain the detent of the valve may be adjustable.
The magnet may be an electromagnet, a permanent magnet being preferred. In the latter case it is particularly advantageous that the magnet is a pot-shaped magnet disposed on a rod of the valve member and said pot-shaped magnet interacts with a ferro-magnetic detent in the housing.
Particularly when the valve is exposed to frequent changes of position and vibration the rod is provided on the side of the maqnet, with a lonaitudinal quide is favourable.
The valve is suitable for the most varied purposes.
Mowever, its use is particularly favourable in a device for controlling the pressure in at least one pressure chamber the valve memker closing a pressure chamber so as to render it impervious to the medium, said pressure chamber beinq provided with a lockable supply pipe, the connecting duct of -the pressure chamber opening into the valve seat and being closable by means of the valve member and the cross-sectional area of the orifice of the connecting duct being smaller than the free area of the valve member turned towards the pressure chamber. Specifically the valve is useful such a device for the additional equalization of the pressure in at ]east two pressure chambers, all connecting ducts of the pressure chambers opening into the valve seat and being closable by means of the valve member and the sum of the cross-sectional areas of all orifices of the connecting ducts being smaller than the free area of the valve member facinc3 the pressure chamber. Suitably the pressure chamber is a set of pneumatic tires of a vehicle such a device is described, for example, in the German Offenlegungsschrift No. 2,822,514.
A practical example of the valve according to the present invention is a device for equalizinq and controlling the pressure in at least two pressure chambers, particularly in pneumatic tires of a vehicle is described in greater detail hereafter with reference to the accompanying drawings in which:
Figure 1 is a longitudinal section of a valve in the device;
~igure 2 is a plan view of the device of Figure l; and Figure 3 is a detail of the device of Figure 1 on an enlarged scale.
~L~60137 Tlle device for equ~lizing and controlling the pressure in at least two pressure chambers is provided with a valve. Said device is suitable particularly for pneumatic tires of vehicles.
The device has a pressure chamber 1 whose one wall is formed by a valve member 2, which is biassed against a valve seat 4 by means of a biassing spring 3. A supply pipe 5, which can he closed by means of a check valve 6, opens into the pressure chamber 1. Connecting ducts 7 and 8 serve for junction with the pressure - 3a -iiL~t~0~37 chamher (not shown) and are for example, pneumatic tires ofvehicles. soth the connecting duct 7 and the connecting duct 8 open into the valve seat ~. The free area of the valve member which faces the pressure chamber is substantially larger than the sum of the cross-sectional areas of the orifices 9 and 10 of the connecting ducts 7 and 8.
Referring particularly to Figure 3 the orifices9 and 10 are provided with sealing lips 11, which face the valve member 2.
Said valve member 2 is provided with a gasket 12 facing the sealing lips 11. The gasket 12 consists of an elastic material which can be displaced bv the sealing lips 11 so that a reliable seal hetween the valve member and the orifices is assured.
The valve member 2 is formed by a piston 13, which is secured to a rod ~and is taper bore mounted. The piston 13 is disposed in a cylindrical housing 15 whose bottom is divided into two regions, a first bottom region forming the valve seat 4 and a second bottom region Eorming a wall portion of the pressure chamber 1. A corrugated tube sleeve 17 serves for sealinq the piston 13 against the cy]inder wall. Said corrugated tube s]eeve 17 is disposed on the piston 13 on the one hand and via an internal ring 18 on the cylinder wall on the other so as to render it impervious to the medium. The biassing spring 3 serves for biassing the piston 13 aqainst the valve seat 4. The biassinq force of the biassing spring may be adjusted by means of a setscrew 19 screwed into the housinq 15. The opening motion of the piston 13 and thus of the valve member is limited by a detent 20, which is adiustable when re~uired.
A pot-shaped permanent magnet 21 is secured to the end of the rod 14 which it faces away from the valve member 2. Said permanent magnet 21 interacts with a ferromagnetic detent 22, which is screwed, in the form of a ring, into the housing 15.
Depending on the screwed-in depth the space X between the ~6tl 137 permanent magnet 21 and the ferromagnetlc detent 22 can be adjusted when the valve rnember 2 is open. A screw cap 23 is screwed to the end of the housing 15 and completely seals off the device.
The screw cap 23 can be provided with a pin 24, which engages a borehole 25 of the rod 14 and serves for guiding said rod. The screw cap may consist of a transparent material so that the position of the permanent magnet 21 and thus the control state of the valve can be seen.
To adjust the space X the ferromagnetic detent 22 can a]so be fixed when required and the permanent magnet 21 can be such that it is screwable on the rod in the axial direction. It is also possible to so design the detent 20 that it is adjustable in order to vary the space X.
To equalize and contro] the pressure in -the pneumatic tires of a vehicle the device may be designed, for example, as follows:- If the nominal pressure in a tire is to be, for examp]e 8 bars, the valve member 2 opens when a pressure of at least 9 bars is applied at the supply pipe 5. The valve member 2 closes as soon as the pressure in the pressure chamber 1 drops to below 7.5 bars. When the pneumatic tires are inflated -to the nominal pressure of 8 bars via the supply pipe 5, the pressure chamber 1 and the connecting ducts 7 and 8, then the valve member 2 thus remains open. When the pressure in one of the pneumatic tires drops then the valve member 2 remains open and the pressure can be equlized from one connecting duct via the pressure chamber into the other connecting duct. Only when the total pressure drops to a value lower than the nominal pressure, i.e., to lower than 8 bars in the present example, does the valve member 2 begin to close. In the first phase only the biassing force of the biassing spring 3 acts and the rod 14 with the valve member 2 is moved towards the valve seat 4. After a spring elongation of approximately 1 mm the influence of both the per~
manent magnet 21 and the detent 22 becomes effective in a second phase and the valve closes with a jolt. In the first phase the space X is so large that the permanent magnet 21 is ineffective.-Thus, there exisis no danger that, without pressure loss in the pressure chamber 1, the valve closes automatically upon a possible impact and does so independently of the position of the valve.
When the valve member 2 is closed and the pressure in one of the pneumatic tires rises again, for example, due to excessive heating, then this pressure rise cannot open the valve member 2 since the pressure applied to the valve member 2 through the cross section of the orifice acts only on an area of the valve member which corresponds to the cross section of the orifice.
Even if this pressure is substantially higher than the nominal pressure of the tire, it is high enough to open the valve member.
This thus ensures that once a valve member 2 is closed it cannot be opened by an excess pressure in the connected pressure chambers. It can be opened only by renewed supply of pressure medium via the supply pipe 5.
In case of a sudden pressure drop in one of the pressure chambers the valve member 2 closes immediately even at excess pressure.
The device is also suitable for pressures of e.g.,
2 to 5 bars.
The valve member may also be a diaphragm inserted bet-ween the walls of a pressure chamber.
The valve member may also be a diaphragm inserted bet-ween the walls of a pressure chamber.
Claims (7)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A valve for equalizing the pressure between two pneumatic tires of a motor vehicle, comprising: a housing formed with a distribution chamber and with a pair of closely spaced valve seats along a wall of said chamber, respective passages communicating with said pneumatic tires and each opening into said chamber at a respective one of said valve seats, and a filling passage provided with a check valve com-municating with said chamber and adapted to enable the filling of said pneumatic tires with air; a valve member displaceable in said housing toward and away from said wall and sealingly closing said chamber, said valve member having a free face en-gageable with said valve seats and of a greater cross-sectional area than the total of the areas of said valve seats, pressure in said chamber applying a force to said valve member tending to urge it in a first direction away from said valve seats; a spring in said housing bearing upon said valve member in a second direction opposite said first direction and applying a predetermined prestress to said valve member tending to hold it against said valve seat; a permanent magnet element and a magnetically attractable element in said housing juxtaposed with one another and having a minimum spacing in a position of said valve member bearing against said valve seats and a maximum spacing in a position of said valve member in which it is held open by a pressure in said chamber above a predeter-mined minimum pressure; and means connecting one of said ele-ments to said valve member for movement therewith, the other of said elements being connected to said housing whereby upon the fall of pressure in said chamber below said predetermined minimum pressure said elements are magnetically drawn together to add a magnetic force to a prestressing force of said spring and snap the valve member closed against said valve seats, said elements being held sufficiently apart by said minimum pressure in said chamber to render any magnetic force negligible by comparison with the force of said spring on said valve member.
2. The valve defined in claim 1, including means for adjusting the spacing between said elements when said minimum pressure in said chamber holds said elements apart.
3. The valve defined in claim 2, wherein said per-manent magnet element is adjustably positionable in said housing.
4. The valve defined in claim 2, wherein said mag-netically attractable element is adjustably positionable in said housing.
5. The valve defined in claim 1, wherein the means connecting said one of said elements to said valve member is a rod extending through said spring and carrying said one of said elements at an end thereof remote from said valve member.
6. The valve defined in claim 5, including guide means in said housing for said end of said rod.
7. The valve defined in claim 1, wherein said housing has a transparent portion for viewing of the relative posi-tions of said elements.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CH264380 | 1980-04-03 | ||
| CH2643/80-2 | 1980-04-03 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1160137A true CA1160137A (en) | 1984-01-10 |
Family
ID=4238364
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000374479A Expired CA1160137A (en) | 1980-04-03 | 1981-04-02 | Valve and its utilisation |
Country Status (11)
| Country | Link |
|---|---|
| EP (1) | EP0048720B1 (en) |
| JP (1) | JPS57500479A (en) |
| AT (1) | ATE8361T1 (en) |
| AU (1) | AU6787181A (en) |
| BR (1) | BR8107987A (en) |
| CA (1) | CA1160137A (en) |
| DE (1) | DE3164660D1 (en) |
| DK (1) | DK534681A (en) |
| IN (1) | IN155229B (en) |
| IT (1) | IT1136873B (en) |
| WO (1) | WO1981002869A1 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4539928A (en) * | 1983-08-01 | 1985-09-10 | Scovill Inc. | Tire equalizer and indicator |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CH341041A (en) * | 1956-03-06 | 1959-09-15 | Saviem | Valve |
| JPS5140623A (en) * | 1974-10-03 | 1976-04-05 | Takasago Iron Works | JIDOBEN |
| SE416918B (en) * | 1978-02-13 | 1981-02-16 | Etter Hansruedi Felix | DEVICE FOR THE EQUIPMENT AND MONITORING OF PRESSURE IN ATMINSTONE TWO PRESSURE CHAMBER, SPECIAL IN AIR CIRCUITS OF A VEHICLE |
| US4210174A (en) * | 1978-05-30 | 1980-07-01 | Instrumentation Industries, Inc. | Positive pressure valves |
-
1981
- 1981-03-26 WO PCT/CH1981/000034 patent/WO1981002869A1/en active IP Right Grant
- 1981-03-26 BR BR8107987A patent/BR8107987A/en unknown
- 1981-03-26 DE DE8181900656T patent/DE3164660D1/en not_active Expired
- 1981-03-26 AT AT81900656T patent/ATE8361T1/en not_active IP Right Cessation
- 1981-03-26 JP JP56500902A patent/JPS57500479A/ja active Pending
- 1981-03-26 EP EP81900656A patent/EP0048720B1/en not_active Expired
- 1981-03-26 AU AU67871/81A patent/AU6787181A/en not_active Abandoned
- 1981-03-27 IT IT20777/81A patent/IT1136873B/en active
- 1981-04-02 CA CA000374479A patent/CA1160137A/en not_active Expired
- 1981-04-24 IN IN435/CAL/81A patent/IN155229B/en unknown
- 1981-12-02 DK DK534681A patent/DK534681A/en not_active Application Discontinuation
Also Published As
| Publication number | Publication date |
|---|---|
| JPS57500479A (en) | 1982-03-18 |
| IT8120777A0 (en) | 1981-03-27 |
| ATE8361T1 (en) | 1984-07-15 |
| BR8107987A (en) | 1982-03-09 |
| WO1981002869A1 (en) | 1981-10-15 |
| AU6787181A (en) | 1981-10-26 |
| IN155229B (en) | 1985-01-12 |
| DE3164660D1 (en) | 1984-08-16 |
| EP0048720B1 (en) | 1984-07-11 |
| DK534681A (en) | 1981-12-02 |
| EP0048720A1 (en) | 1982-04-07 |
| IT1136873B (en) | 1986-09-03 |
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