CA1302728C - Pneumatic pressure gauge - Google Patents
Pneumatic pressure gaugeInfo
- Publication number
- CA1302728C CA1302728C CA000552803A CA552803A CA1302728C CA 1302728 C CA1302728 C CA 1302728C CA 000552803 A CA000552803 A CA 000552803A CA 552803 A CA552803 A CA 552803A CA 1302728 C CA1302728 C CA 1302728C
- Authority
- CA
- Canada
- Prior art keywords
- support means
- passageway
- tubular portion
- gauge
- bore
- 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 - Lifetime
Links
Landscapes
- Measuring Fluid Pressure (AREA)
Abstract
ABSTRACT
An improved pneumatic pressure gauge used in inflating a pneumatic tire comprises an adapter means having a gas passage extending from a gas inlet end to a gas outlet end, and a gauge casing connected integrally to the adapter member. The gauge casing includes a gauge chamber, an opening intercommunicating the gas passage and the gauge chamber, a control chamber communicated with the gauge chamber, and a gas release passage opened to atmosphere and communicated with the control chamber. A
first valve means is disposed to close the communication between the gas passage and the gauge chamber, and a second pressure responsive valve means is disposed in the control chamber to close the communication between the control chamber and the gas release passage. The valve means are opened when the pressure in the tire or the gas passage exceeds the predetermined pressure.
An improved pneumatic pressure gauge used in inflating a pneumatic tire comprises an adapter means having a gas passage extending from a gas inlet end to a gas outlet end, and a gauge casing connected integrally to the adapter member. The gauge casing includes a gauge chamber, an opening intercommunicating the gas passage and the gauge chamber, a control chamber communicated with the gauge chamber, and a gas release passage opened to atmosphere and communicated with the control chamber. A
first valve means is disposed to close the communication between the gas passage and the gauge chamber, and a second pressure responsive valve means is disposed in the control chamber to close the communication between the control chamber and the gas release passage. The valve means are opened when the pressure in the tire or the gas passage exceeds the predetermined pressure.
Description
BACKGROUND OF THE INVENTION
This invention relates to a pneumatic pressure gauge used for a pneumatic tire, particularly to a pneumatic pressure gauge having a pressure responsive means that can release gas from the tire when the pressure to which the tire is inflated exceeds a predetermined pressure.
It is a common practice to use a pressure gauge as guidance in inflating a pneumatic tire. The pressure gauge is applied to the tire when the pressure to which the tire is inflated is assumed to be substantially a required pressure. If the pressure is not right, it should be adjusted by letting out or adding some gas.
Since pressure gauges available hitherto can merely measure the pressure present in the tire, it is necessary to detach and attach the pressure gauge again and again to let out or add the gas so as to achieve a desired pressure in the tire, The manipulation of such a pressure gauge is rather inconvenient.
SUMMARY OF THE INVENTION
The present invention provides a pneumatic pressure gauge which comprises: a gauge casing constituted of first and second cylindrical portions threadedly coupled at first ends thereof; first support means rigidly connected to a second end of the first cylindrical portion and having a passageway therethrough which is in communication with a bore of the first cylindrical portion; second support means connected to a second end of the second cylindrical portion, the second support means having a first passageway therethrough which is in communication with a bore of the second cylindrical portion; a pressure responsive valve means having a first position whereat the valve means abuts the first support means whereby the passageway in the first support means is closed, and a second position whereat the valve means does not abut the ~ ~302728 first support means, whereby the passageway in the first support means is open, the valve means being displaced from its first position to its second position in response to a predetermined pressure in the passageway in the first support means; a pressure responsive diaphragm means made of elastic material and having a peripheral portion secured sealingly to the second support means; wherein the second support means comprises a substantially annular base portion, a first tubular portion rigidly connected to the base portion and having a bore, a second tubular portion rigidly connected to the base portion and having a bore, the first tubular portion being arranged in the bore of the second tubular portion, and a second passageway which is in communication with the bore of the first tubular portion and a space external to the second cylindrical portion, the diaphragm means being secured to and end of the second tubular portion and having a first position whereat the diaphragm means abuts an end of the first tubular portion, whereby the end of the first tubular portion is closed, the first and second tubular portions, the base portion and the diaphragm means defining an annular control chamber when the diaphragm means is in its first position, the control chamber being in communication with the first passageway of the second support means, whereby the diaphragm is displaced from its first position to a second portion in response to the predetermined pressure in the passageway of the first support means, control chamber and the bore of the first tubular portion being in communication when the diaphragm means is in its second position.
In one aspect of the invention, a clamping means is fixedly arranged relative to the second cylindrical portion, the clamping means having an annular projection in contact with the diaphragm means for holding the diaphragm means against the end of the first tubular portion, the diameter of the annular projection being greater than the diameter of the end of the first tubular portion.
~ 1302728 The present exemplary preferred embodiment will be described in detail with reference to the accompanying drawings, in which:
DETAILED DESCRIPTION OF THE DRAWINGS
Fig. 1 is a sectional view of a pneumatic pressure gauge constructed according to the present invention; and Fig. 2 is a perspective view of the pressure gauge of Fig, 1.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
Referring to the drawings, a pneumatic pressure gauge 1 is shown, including an adapter piece 2 which incorporates parts to be connected to a hose of a pneumatic pump and an inflating valve of a tire to be inflated, and has a gas passage 6 extending from one end to the other. To the adapter piece 2 is connected integrally a pressure gauge casing 3. The gauge casing 3 is telescopic and is constituted of a first cylindrical portion 7 which is connected to the adapter piece 2 and a second portion 8 sleeved threadedly on the first portion 7. The outer periphery of the first cylindrical portion 7 is graduated.
At the top of the second portion 8 of the gauge casing 3 is attached threadedly a cap 9 to close the second portion 8. In the interior of the gauge casing 3 is disposed a support body 10 which divides the casing 3 into two regions 11 and 12. The support body 10 has a first tubular portion 13 with a closed end 14 extending axially into the region 11, a second tubular portion 15 with an open end extending axially into the region 12, and a third tubular portion 16 with an open end extending axially around said second tubular portion 15.
,:
130Z7Z~
The region 11 defines a gauge chamber which is communicated with the gas passage 6 of the adapter piece through an opening 17 of the first portion 7 of the casing 3. Near the opening 17 is a valve seat 18 against which is seated a valve plug 19 to interrupt the communication between the gas passage 6 and the gauge chamber 11. The valve plug 19 is biassed by a compression spring 20 which in turn is affixed to the closed end 14 of the support body 10. The valve plug 19 is biassed by a spring force predetermined to be equivalent to the desired pneumatic pressure to which a tire is to be inflated. According to graduated marks of the first portion 7 of the casing 3, the spring force can be adjusted by turning the second portion 8 relative to the first portion 7 of the gauge casing 3 so as to make the gauge 1 suitable for use in determining and controlling different pneumatic pressures of tires. The valve plug 19 is responsive to the predetermined pressure of the gas passage 9 and can be moved against the spring force to open the opening 17 when the predetermined pressure is reached.
The support body 10 is provided with a diametral bore 21 opening at the periphery of the second portion 8 of the casing 3, and an axial bore 22 intersecting the diametral bore 21 and extending from the closed end 14 to the open end of the second tubular portion 15 of the support body 10 .
A diaphragm valve member 23 which is made of a rubber-like material is secured sealingly with its circumferential portion to the open end of the third tubular portion 16 of the support body 10, confining a control chamber 24 between the diaphragm member 23 and the support body 10. An axial bore 25 is arranged in the support body 10 to communicate the gauge chamber 11 and the control chamber 24.
A clamping member 26 which is formed intergrally with the cap 9 extends axially into the region 12. The ~302'728 clamping member 26 has an annular end 27 to depress the diaphragm member 23 against the open end of the second tubular portion 15 of the support body 10. The diameter of the annular end 27 is greater than that of the open end of the second tubular portion 15 so that the diaphragm member 23 contracts against or closes resiliently the open end of the axial bore 22.
In operation, the adapter member 2 is connected to a hose of a pump and an inflating valve of the tire to be inflated. When the pressure in the tire and the gas passage 6 exceeds a predetermined pressure, the valve plug 19 is actuated to an open position, permitting the excess gas to flow into the gauge chamber 11 from the gas passage 6. The gas in the gauge chamber 11 then flows into the control chamber 24 through the bore 25. When the pressure in the control chamber 24 increases to that capable of thrusting the central portion of the diaphragm member 23 to move away from the open end of the bore 22, the excess gas escapes through the axial bore 22 and the diametral bore 21. When the pressure is reduced, the diaphragm member 23 returns to its normal closed position. Upon continuous injection of the gas, the diaphragm member 23 vibrates at the open end of the second tubular portion 15 and produces sound to warn the operator to stop the operation. It can be appreciated that the pressure in the inflated tire will not exceed the desired predeterminèd pressure even though the operator is neglectful.
With the invention thus explained, it is apparent that various modifications and variations can be made without departing from the scope of the invention. It is therefore intended that the invention be limited as indicated in the appended claims.
This invention relates to a pneumatic pressure gauge used for a pneumatic tire, particularly to a pneumatic pressure gauge having a pressure responsive means that can release gas from the tire when the pressure to which the tire is inflated exceeds a predetermined pressure.
It is a common practice to use a pressure gauge as guidance in inflating a pneumatic tire. The pressure gauge is applied to the tire when the pressure to which the tire is inflated is assumed to be substantially a required pressure. If the pressure is not right, it should be adjusted by letting out or adding some gas.
Since pressure gauges available hitherto can merely measure the pressure present in the tire, it is necessary to detach and attach the pressure gauge again and again to let out or add the gas so as to achieve a desired pressure in the tire, The manipulation of such a pressure gauge is rather inconvenient.
SUMMARY OF THE INVENTION
The present invention provides a pneumatic pressure gauge which comprises: a gauge casing constituted of first and second cylindrical portions threadedly coupled at first ends thereof; first support means rigidly connected to a second end of the first cylindrical portion and having a passageway therethrough which is in communication with a bore of the first cylindrical portion; second support means connected to a second end of the second cylindrical portion, the second support means having a first passageway therethrough which is in communication with a bore of the second cylindrical portion; a pressure responsive valve means having a first position whereat the valve means abuts the first support means whereby the passageway in the first support means is closed, and a second position whereat the valve means does not abut the ~ ~302728 first support means, whereby the passageway in the first support means is open, the valve means being displaced from its first position to its second position in response to a predetermined pressure in the passageway in the first support means; a pressure responsive diaphragm means made of elastic material and having a peripheral portion secured sealingly to the second support means; wherein the second support means comprises a substantially annular base portion, a first tubular portion rigidly connected to the base portion and having a bore, a second tubular portion rigidly connected to the base portion and having a bore, the first tubular portion being arranged in the bore of the second tubular portion, and a second passageway which is in communication with the bore of the first tubular portion and a space external to the second cylindrical portion, the diaphragm means being secured to and end of the second tubular portion and having a first position whereat the diaphragm means abuts an end of the first tubular portion, whereby the end of the first tubular portion is closed, the first and second tubular portions, the base portion and the diaphragm means defining an annular control chamber when the diaphragm means is in its first position, the control chamber being in communication with the first passageway of the second support means, whereby the diaphragm is displaced from its first position to a second portion in response to the predetermined pressure in the passageway of the first support means, control chamber and the bore of the first tubular portion being in communication when the diaphragm means is in its second position.
In one aspect of the invention, a clamping means is fixedly arranged relative to the second cylindrical portion, the clamping means having an annular projection in contact with the diaphragm means for holding the diaphragm means against the end of the first tubular portion, the diameter of the annular projection being greater than the diameter of the end of the first tubular portion.
~ 1302728 The present exemplary preferred embodiment will be described in detail with reference to the accompanying drawings, in which:
DETAILED DESCRIPTION OF THE DRAWINGS
Fig. 1 is a sectional view of a pneumatic pressure gauge constructed according to the present invention; and Fig. 2 is a perspective view of the pressure gauge of Fig, 1.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
Referring to the drawings, a pneumatic pressure gauge 1 is shown, including an adapter piece 2 which incorporates parts to be connected to a hose of a pneumatic pump and an inflating valve of a tire to be inflated, and has a gas passage 6 extending from one end to the other. To the adapter piece 2 is connected integrally a pressure gauge casing 3. The gauge casing 3 is telescopic and is constituted of a first cylindrical portion 7 which is connected to the adapter piece 2 and a second portion 8 sleeved threadedly on the first portion 7. The outer periphery of the first cylindrical portion 7 is graduated.
At the top of the second portion 8 of the gauge casing 3 is attached threadedly a cap 9 to close the second portion 8. In the interior of the gauge casing 3 is disposed a support body 10 which divides the casing 3 into two regions 11 and 12. The support body 10 has a first tubular portion 13 with a closed end 14 extending axially into the region 11, a second tubular portion 15 with an open end extending axially into the region 12, and a third tubular portion 16 with an open end extending axially around said second tubular portion 15.
,:
130Z7Z~
The region 11 defines a gauge chamber which is communicated with the gas passage 6 of the adapter piece through an opening 17 of the first portion 7 of the casing 3. Near the opening 17 is a valve seat 18 against which is seated a valve plug 19 to interrupt the communication between the gas passage 6 and the gauge chamber 11. The valve plug 19 is biassed by a compression spring 20 which in turn is affixed to the closed end 14 of the support body 10. The valve plug 19 is biassed by a spring force predetermined to be equivalent to the desired pneumatic pressure to which a tire is to be inflated. According to graduated marks of the first portion 7 of the casing 3, the spring force can be adjusted by turning the second portion 8 relative to the first portion 7 of the gauge casing 3 so as to make the gauge 1 suitable for use in determining and controlling different pneumatic pressures of tires. The valve plug 19 is responsive to the predetermined pressure of the gas passage 9 and can be moved against the spring force to open the opening 17 when the predetermined pressure is reached.
The support body 10 is provided with a diametral bore 21 opening at the periphery of the second portion 8 of the casing 3, and an axial bore 22 intersecting the diametral bore 21 and extending from the closed end 14 to the open end of the second tubular portion 15 of the support body 10 .
A diaphragm valve member 23 which is made of a rubber-like material is secured sealingly with its circumferential portion to the open end of the third tubular portion 16 of the support body 10, confining a control chamber 24 between the diaphragm member 23 and the support body 10. An axial bore 25 is arranged in the support body 10 to communicate the gauge chamber 11 and the control chamber 24.
A clamping member 26 which is formed intergrally with the cap 9 extends axially into the region 12. The ~302'728 clamping member 26 has an annular end 27 to depress the diaphragm member 23 against the open end of the second tubular portion 15 of the support body 10. The diameter of the annular end 27 is greater than that of the open end of the second tubular portion 15 so that the diaphragm member 23 contracts against or closes resiliently the open end of the axial bore 22.
In operation, the adapter member 2 is connected to a hose of a pump and an inflating valve of the tire to be inflated. When the pressure in the tire and the gas passage 6 exceeds a predetermined pressure, the valve plug 19 is actuated to an open position, permitting the excess gas to flow into the gauge chamber 11 from the gas passage 6. The gas in the gauge chamber 11 then flows into the control chamber 24 through the bore 25. When the pressure in the control chamber 24 increases to that capable of thrusting the central portion of the diaphragm member 23 to move away from the open end of the bore 22, the excess gas escapes through the axial bore 22 and the diametral bore 21. When the pressure is reduced, the diaphragm member 23 returns to its normal closed position. Upon continuous injection of the gas, the diaphragm member 23 vibrates at the open end of the second tubular portion 15 and produces sound to warn the operator to stop the operation. It can be appreciated that the pressure in the inflated tire will not exceed the desired predeterminèd pressure even though the operator is neglectful.
With the invention thus explained, it is apparent that various modifications and variations can be made without departing from the scope of the invention. It is therefore intended that the invention be limited as indicated in the appended claims.
Claims (3)
1. A pneumatic pressure gauge comprising:
(a) a gauge casing comprising first and second cylindrical portions threadedly coupled at first ends thereof;
(b) first support means rigidly connected to a second end of said first cylindrical portion, said first support means having a passageway therethrough which is in communication with a bore of said first cylindrical portion;
(c) second support means connected to a second end of said second cylindrical portion, said second support means having a first passageway therethrough which is in communication with a bore of said second cylindrical portion;
(d) a pressure responsive valve means having a first position whereat said valve means abuts said first support means whereby said passageway in said first support means is closed, and a second position whereat said valve means does not abut said first support means, whereby said passageway in said first support means is open, said valve means being displaced from its first position to its second position in response to a predetermined pressure in said passageway in said first support means, (e) a pressure responsive diaphragm means made of elastic material and having a peripheral portion secured sealingly to said second support means, wherein said second support means comprises a substantially annular base portion, a first tubular portion rigidly connected to said base portion and having a bore, a second tubular portion rigidly connected to said base portion and having a bore, said first tubular portion being arranged in said bore of said second tubular portion, and a second passageway which is in communication with said bore of said first tubular portion and a space external to said second cylindrical portion, said diaphragm means being secured to an end of said second tubular portion and having a first position whereat said diaphragm means abuts an end of said first tubular portion, whereby said end of said first tubular portion is closed, said first and second tubular portions, said base portion and said diaphragm means defining an annular control chamber when said diaphragm means is in its first position, said control chamber being in communication with said first passageway of said second support means, whereby said diaphragm is displaced from its first position to a second portion in response to said predetermined pressure in said passageway of said first support means, control chamber and said bore of said first tubular portion being in communication when said diaphragm means is in its second position.
(a) a gauge casing comprising first and second cylindrical portions threadedly coupled at first ends thereof;
(b) first support means rigidly connected to a second end of said first cylindrical portion, said first support means having a passageway therethrough which is in communication with a bore of said first cylindrical portion;
(c) second support means connected to a second end of said second cylindrical portion, said second support means having a first passageway therethrough which is in communication with a bore of said second cylindrical portion;
(d) a pressure responsive valve means having a first position whereat said valve means abuts said first support means whereby said passageway in said first support means is closed, and a second position whereat said valve means does not abut said first support means, whereby said passageway in said first support means is open, said valve means being displaced from its first position to its second position in response to a predetermined pressure in said passageway in said first support means, (e) a pressure responsive diaphragm means made of elastic material and having a peripheral portion secured sealingly to said second support means, wherein said second support means comprises a substantially annular base portion, a first tubular portion rigidly connected to said base portion and having a bore, a second tubular portion rigidly connected to said base portion and having a bore, said first tubular portion being arranged in said bore of said second tubular portion, and a second passageway which is in communication with said bore of said first tubular portion and a space external to said second cylindrical portion, said diaphragm means being secured to an end of said second tubular portion and having a first position whereat said diaphragm means abuts an end of said first tubular portion, whereby said end of said first tubular portion is closed, said first and second tubular portions, said base portion and said diaphragm means defining an annular control chamber when said diaphragm means is in its first position, said control chamber being in communication with said first passageway of said second support means, whereby said diaphragm is displaced from its first position to a second portion in response to said predetermined pressure in said passageway of said first support means, control chamber and said bore of said first tubular portion being in communication when said diaphragm means is in its second position.
2. The pneumatic pressure gauge as defined in claim 1, further comprising a clamping means fixedly arranged relative to said second cylindrical portion, said clamping means having an annular projection in contact with said diaphragm means for holding said diaphragm means against said end of said first tubular portion, the diameter of said annular projection being greater than the diameter of said end of said first tubular portion.
3. The pneumatic pressure gauge as defined in claim 1 or 2, further comprising a tubular adaptor means connected to said gauge casing and having a gas inlet, a gas outlet and a passageway extending between said gas outlet, said gas passage being in communication with said passageway of said first support means.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000552803A CA1302728C (en) | 1987-11-20 | 1987-11-20 | Pneumatic pressure gauge |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000552803A CA1302728C (en) | 1987-11-20 | 1987-11-20 | Pneumatic pressure gauge |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1302728C true CA1302728C (en) | 1992-06-09 |
Family
ID=4136933
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000552803A Expired - Lifetime CA1302728C (en) | 1987-11-20 | 1987-11-20 | Pneumatic pressure gauge |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1302728C (en) |
-
1987
- 1987-11-20 CA CA000552803A patent/CA1302728C/en not_active Expired - Lifetime
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKLA | Lapsed |