CA2573647A1 - Security cage for vent pipes - Google Patents
Security cage for vent pipes Download PDFInfo
- Publication number
- CA2573647A1 CA2573647A1 CA002573647A CA2573647A CA2573647A1 CA 2573647 A1 CA2573647 A1 CA 2573647A1 CA 002573647 A CA002573647 A CA 002573647A CA 2573647 A CA2573647 A CA 2573647A CA 2573647 A1 CA2573647 A1 CA 2573647A1
- Authority
- CA
- Canada
- Prior art keywords
- screen member
- flange
- security cage
- screen
- pipe
- 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.)
- Abandoned
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23K—FEEDING FUEL TO COMBUSTION APPARATUS
- F23K5/00—Feeding or distributing other fuel to combustion apparatus
- F23K5/02—Liquid fuel
- F23K5/14—Details thereof
- F23K5/16—Safety devices
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- E—FIXED CONSTRUCTIONS
- E03—WATER SUPPLY; SEWERAGE
- E03F—SEWERS; CESSPOOLS
- E03F5/00—Sewerage structures
- E03F5/08—Ventilation of sewers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23K—FEEDING FUEL TO COMBUSTION APPARATUS
- F23K2900/00—Special features of, or arrangements for fuel supplies
- F23K2900/05082—Removing gaseous substances from liquid fuel line, e.g. oxygen
Abstract
The present invention provides a security cage for use with a vent pipe. The security cage comprises a screen member having a generally circular flange portion being integrally connected with a generally hemispherical body portion. The screen member is formed from a plurality of rigid wires intersecting one other in a criss-cross arrangement and engaged with each other at their points of intersection so as to retain the hemispherical shape of the body and the circular shape of the flange. An air flow baffle may be used in combination with the security cage.
Description
"SECURITY CAGE FOR VENT PIPES"
BACKGROUND OF THE INVENTION
The present invention generally relates to venting, exhaustion and/or admission of air in piping systems. More specifically, the present invention relates to a security screen arrangement for an air vent pipe.
Venting systems are used with air valves to prevent vacuum conditions within a liquid pipeline, and to allow for exhaust or purging of gases from the liquid carried in the pipeline. In the case of an underground pipeline, such as used with potable water systems or waste or ground water systems, oftentimes the vent connections occur in underground vaults and reservoirs, which themselves need to be vented to the atmosphere. Vent pipes are also used in other situations where air needs to be exhausted or introduced into various areas or spaces such as ground level reservoirs.
Typical security screens used in connection with vent pipes comprise flat mesh screen placed across the open ends of vent pipes, and held in place with exterior bands or clamps, or other fastening arrangements. Such arrangements have drawbacks in that the flat surface has an open area limited generally to the cross-sectional area of the pipe less the area of the screen wires, which may become substantially covered with debris, reducing the available area for the free flow of air into or out of the vent pipe.
Also, having merely a screen provides a limited security measure which might be readily defeated, such as by a person who intentionally seeks to introduce hazardous materials, such as a liquid, in that a small diameter tube might be introduced through the openings in the security screen when no additional security barrier is provided.
SUMMARY OF THE INVENTION
The present invention provides a security cage for use with a pipeline, wherein the vent pipe includes a pipe end with a flange. The security cage comprises a screen member having a generally circular flange portion sized to overlie the pipe end flange and surrounds and is integrally connected with a generally hemispherical body portion. The screen member is formed from a plurality of rigid wires intersecting one other in a criss-cross arrangement and engaged with each other at their points of intersection so as to retain the hemispherical shape of the body and the circular shape of the flange. A second flange member is sized to overlie the pipe end flange, with the screen member flange sandwiched therebetween. A plurality of bolts are arranged to threadingly engage with at least one of the flanges to clampingly secure the screen member between the pipe end flange and the second flange.
In an embodiment, the flanges have a curved interior opening complementary to a contour of the screen member body.
In an embodiment, the criss-cross arrangement of wires provides a defined opening size for the screen member and further includes a mesh coving the screen member having a smaller opening size than the screen member.
In an embodiment, the second flange comprises a flange from another pipe member such that the screen member is interposed along a length of a vent pipe.
In an embodiment, the second flange is solely a flange, such that the screen member is attached at an end of the vent pipe.
In an embodiment, the body is arranged such that the hemispherical shape of the screen member extends inwardly at the end of the vent pipe.
In an embodiment, a two-way damper is positioned between the screen member and the pipe flange.
In an embodiment, the two-way damper comprises a baffle comprising a flexible member with a first portion secured and held in a fixed position by the flanges and a second portion normally oriented in a first position, but free to move relative to the first position, a third portion, arranged between the first and second portions being flexible and resilient and allowing the second portion to move to a second position relative to the first position upon the application of a pressure differential across the baffle above a threshold pressure and causing the second portion to return to the first position upon the application of a pressure differential across the baffle below the threshold pressure.
In an embodiment, a second screen member is arranged such that the first and second screen members are sandwiched between the two flanges and the two-way damper is sandwiched between the screen members.
In an embodiment, a security arrangement for an air vent pipe is provided wherein the vent pipe is comprised of two pipes joined together at their ends, with each pipe end including a flange surrounding the pipe end for connecting to the other pipe end. The security arrangement comprises a first screen member having a generally circular flange portion sized to overlie one of the pipe end flanges and surrounding and being integrally connected with a generally hemispherical body portion which extends into the pipe end whose flange the first screen member overlies, the screen member being formed from a plurality of rigid wires intersecting one other in a criss-cross arrangement and engaged with each other at their points of intersection so as to retain the hemispherical shape of the body and the circular shape of the flange. A second screen member is included having a generally circular flange portion sized to overlie the other one of the pipe end flanges and surrounding and being integrally connected with a generally hemispherical body portion which extends into the pipe end whose flange the second screen member overlies, the screen member being formed from a plurality of rigid wires intersecting one other in a criss-cross arrangement and engaged with each other at their points of intersection so as to retain the hemispherical shape of the body and the circular shape of the flange. An air flow damper, which may be a two-way damper, is positioned between the first screen member and the second screen member.
In an embodiment, the two-way damper comprises a baffle comprising a flexible member with a first portion secured and held in a fixed position by the flanges and a second portion normally oriented in a first position, but free to move relative to the first position, a third portion, arranged between the first and second portions being flexible and resilient and allowing the second portion to move to a second position relative to the first position upon the application of a pressure differential across the baffle above a threshold pressure and causing the second portion to return to the first position upon the application of a pressure differential across the baffle below the threshold pressure.
In an embodiment, the flanges have a curved interior opening complementary to a contour of the screen member bodies.
BACKGROUND OF THE INVENTION
The present invention generally relates to venting, exhaustion and/or admission of air in piping systems. More specifically, the present invention relates to a security screen arrangement for an air vent pipe.
Venting systems are used with air valves to prevent vacuum conditions within a liquid pipeline, and to allow for exhaust or purging of gases from the liquid carried in the pipeline. In the case of an underground pipeline, such as used with potable water systems or waste or ground water systems, oftentimes the vent connections occur in underground vaults and reservoirs, which themselves need to be vented to the atmosphere. Vent pipes are also used in other situations where air needs to be exhausted or introduced into various areas or spaces such as ground level reservoirs.
Typical security screens used in connection with vent pipes comprise flat mesh screen placed across the open ends of vent pipes, and held in place with exterior bands or clamps, or other fastening arrangements. Such arrangements have drawbacks in that the flat surface has an open area limited generally to the cross-sectional area of the pipe less the area of the screen wires, which may become substantially covered with debris, reducing the available area for the free flow of air into or out of the vent pipe.
Also, having merely a screen provides a limited security measure which might be readily defeated, such as by a person who intentionally seeks to introduce hazardous materials, such as a liquid, in that a small diameter tube might be introduced through the openings in the security screen when no additional security barrier is provided.
SUMMARY OF THE INVENTION
The present invention provides a security cage for use with a pipeline, wherein the vent pipe includes a pipe end with a flange. The security cage comprises a screen member having a generally circular flange portion sized to overlie the pipe end flange and surrounds and is integrally connected with a generally hemispherical body portion. The screen member is formed from a plurality of rigid wires intersecting one other in a criss-cross arrangement and engaged with each other at their points of intersection so as to retain the hemispherical shape of the body and the circular shape of the flange. A second flange member is sized to overlie the pipe end flange, with the screen member flange sandwiched therebetween. A plurality of bolts are arranged to threadingly engage with at least one of the flanges to clampingly secure the screen member between the pipe end flange and the second flange.
In an embodiment, the flanges have a curved interior opening complementary to a contour of the screen member body.
In an embodiment, the criss-cross arrangement of wires provides a defined opening size for the screen member and further includes a mesh coving the screen member having a smaller opening size than the screen member.
In an embodiment, the second flange comprises a flange from another pipe member such that the screen member is interposed along a length of a vent pipe.
In an embodiment, the second flange is solely a flange, such that the screen member is attached at an end of the vent pipe.
In an embodiment, the body is arranged such that the hemispherical shape of the screen member extends inwardly at the end of the vent pipe.
In an embodiment, a two-way damper is positioned between the screen member and the pipe flange.
In an embodiment, the two-way damper comprises a baffle comprising a flexible member with a first portion secured and held in a fixed position by the flanges and a second portion normally oriented in a first position, but free to move relative to the first position, a third portion, arranged between the first and second portions being flexible and resilient and allowing the second portion to move to a second position relative to the first position upon the application of a pressure differential across the baffle above a threshold pressure and causing the second portion to return to the first position upon the application of a pressure differential across the baffle below the threshold pressure.
In an embodiment, a second screen member is arranged such that the first and second screen members are sandwiched between the two flanges and the two-way damper is sandwiched between the screen members.
In an embodiment, a security arrangement for an air vent pipe is provided wherein the vent pipe is comprised of two pipes joined together at their ends, with each pipe end including a flange surrounding the pipe end for connecting to the other pipe end. The security arrangement comprises a first screen member having a generally circular flange portion sized to overlie one of the pipe end flanges and surrounding and being integrally connected with a generally hemispherical body portion which extends into the pipe end whose flange the first screen member overlies, the screen member being formed from a plurality of rigid wires intersecting one other in a criss-cross arrangement and engaged with each other at their points of intersection so as to retain the hemispherical shape of the body and the circular shape of the flange. A second screen member is included having a generally circular flange portion sized to overlie the other one of the pipe end flanges and surrounding and being integrally connected with a generally hemispherical body portion which extends into the pipe end whose flange the second screen member overlies, the screen member being formed from a plurality of rigid wires intersecting one other in a criss-cross arrangement and engaged with each other at their points of intersection so as to retain the hemispherical shape of the body and the circular shape of the flange. An air flow damper, which may be a two-way damper, is positioned between the first screen member and the second screen member.
In an embodiment, the two-way damper comprises a baffle comprising a flexible member with a first portion secured and held in a fixed position by the flanges and a second portion normally oriented in a first position, but free to move relative to the first position, a third portion, arranged between the first and second portions being flexible and resilient and allowing the second portion to move to a second position relative to the first position upon the application of a pressure differential across the baffle above a threshold pressure and causing the second portion to return to the first position upon the application of a pressure differential across the baffle below the threshold pressure.
In an embodiment, the flanges have a curved interior opening complementary to a contour of the screen member bodies.
In an embodiment, the criss-cross arrangement of wires provides a defined opening size for the screen members and further including a mesh coving at least one of the screen members having a smaller opening size than the screen member.
In an embodiment, a security cage is provided for use with a vent pipe. The security cage comprises a screen member having a generally circular flange portion being integrally connected with a generally hemispherical body portion. The screen member is formed from a plurality of rigid wires intersecting one other in a criss-cross arrangement and engaged with each other at their points of intersection so as to retain the hemispherical shape of the body and the circular shape of the flange.
Other details of embodiments of the present invention are illustrated in the drawings and described below.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 illustrates a cross-sectional view of a liquid pipeline system including a vent and security system embodying the principles of the present invention.
FIG. 2 illustrates a cross-sectional view of an embodiment of a single security cage of the present invention mounted on a vent pipe.
FIG. 3 illustrates a cross-sectional view of an embodiment of two security cages used in conjunction with a two-way damper shown in an open position in a vent pipe.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
The present invention generally relates to a security system which may be used in connection with exhausting and admitting air when installed in vent pipes of water and waste handling pipelines and/or piping systems. A primary function of such vent pipes is to prevent air and/or vacuum related problems within a liquid pipeline. Other types of vent pipes can utilize the security system of the present invention, but for purposes of describing an embodiment of the present invention the security system is described in connection with a vent pipe for water handling pipelines.
Referring now to FIG. 1, a general arrangement of a liquid transport system 20 utilizing the present invention is illustrated. The system 20 includes a portion that is positioned adjacent to (or sometimes within) a vault 22 that is buried below a surface grade 24. The vault 22 includes a vent pipe 26 to allow an inflow and outflow of air relative to an interior 28 of the vault.
In an embodiment, a security cage is provided for use with a vent pipe. The security cage comprises a screen member having a generally circular flange portion being integrally connected with a generally hemispherical body portion. The screen member is formed from a plurality of rigid wires intersecting one other in a criss-cross arrangement and engaged with each other at their points of intersection so as to retain the hemispherical shape of the body and the circular shape of the flange.
Other details of embodiments of the present invention are illustrated in the drawings and described below.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 illustrates a cross-sectional view of a liquid pipeline system including a vent and security system embodying the principles of the present invention.
FIG. 2 illustrates a cross-sectional view of an embodiment of a single security cage of the present invention mounted on a vent pipe.
FIG. 3 illustrates a cross-sectional view of an embodiment of two security cages used in conjunction with a two-way damper shown in an open position in a vent pipe.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
The present invention generally relates to a security system which may be used in connection with exhausting and admitting air when installed in vent pipes of water and waste handling pipelines and/or piping systems. A primary function of such vent pipes is to prevent air and/or vacuum related problems within a liquid pipeline. Other types of vent pipes can utilize the security system of the present invention, but for purposes of describing an embodiment of the present invention the security system is described in connection with a vent pipe for water handling pipelines.
Referring now to FIG. 1, a general arrangement of a liquid transport system 20 utilizing the present invention is illustrated. The system 20 includes a portion that is positioned adjacent to (or sometimes within) a vault 22 that is buried below a surface grade 24. The vault 22 includes a vent pipe 26 to allow an inflow and outflow of air relative to an interior 28 of the vault.
Typically the interior 28 of the vault 22 is accessible through a removable manhole cover 30 or the like. A pipeline 32 extends through or below the vault 22 which may be used to transport potable water, wastewater, and other liquids. In order to prevent damage to the pipeline 32, it is customary to provide an air valve 34 in a vent line 36, as discussed in U.S.
Patent No. 5,613,513, which is incorporated herein by reference. Generally, the air valve 34 allows for a flow of air into and out of the pipeline 32 as required by the pressures in the pipeline, but prevents a flow of liquid from leaving the pipeline. When the pressure in the pipeline 32 is low, that is, below atmospheric pressure, air from the interior 28 of the vault 22 is allowed to be drawn into the pipeline 32 through the air valve 34 and vent line 36.
As shown in FIG. l, and in greater detail in FIG. 2, the present invention provides a security cage 40 for use with a vent pipe 42, wherein the pipe includes a pipe end 44 with a flange 46. The security cage 40 comprises a screen member 47 having a generally circular flange portion 48 sized to overlie the pipe end flange 46 and surrounds and is integrally connected with a generally hemispherical body portion 50. The screen member 47 is formed from a plurality of rigid wires 52 intersecting one other in a criss-cross arrangement and engaged with each other at their points of intersection 54 so as to retain the hemispherical shape of the body portion 50 and the circular shape of the flange portion 48. The wires 52 may be secured together, such as by welding, or may be held together by friction, such as if the wires are woven into the screen shape. The wires 52 may have a circular cross section, or may have other shapes, such as a square, rectangular or oval cross section. A second flange member 56 is sized to overlie the pipe end flange 46, with the screen member flange portion 48 sandwiched therebetween. A plurality of bolts 58 are arranged to threadingly engage with at least one of the flanges 46, 56 to clampingly secure the screen member 47 between the pipe end flange and the second flange. A gasket 59 may also be provided between the screen member flange portion 48 and the second flange 56 to assist in securing the security cage 40 in place.
The hemispherical shape of the body portion 50 provides a greater surface area for the screen member 47 than is provided when a security screen is merely stretched across a diameter of a pipe opening, thereby allowing for a greater air flow to enter or exit the pipeline, particularly when the screen is partially covered with debris.
In an embodiment, the flanges 46, 56 have a curved interior opening 60 shaped complementary to a contour of the screen member body portion 50.
Patent No. 5,613,513, which is incorporated herein by reference. Generally, the air valve 34 allows for a flow of air into and out of the pipeline 32 as required by the pressures in the pipeline, but prevents a flow of liquid from leaving the pipeline. When the pressure in the pipeline 32 is low, that is, below atmospheric pressure, air from the interior 28 of the vault 22 is allowed to be drawn into the pipeline 32 through the air valve 34 and vent line 36.
As shown in FIG. l, and in greater detail in FIG. 2, the present invention provides a security cage 40 for use with a vent pipe 42, wherein the pipe includes a pipe end 44 with a flange 46. The security cage 40 comprises a screen member 47 having a generally circular flange portion 48 sized to overlie the pipe end flange 46 and surrounds and is integrally connected with a generally hemispherical body portion 50. The screen member 47 is formed from a plurality of rigid wires 52 intersecting one other in a criss-cross arrangement and engaged with each other at their points of intersection 54 so as to retain the hemispherical shape of the body portion 50 and the circular shape of the flange portion 48. The wires 52 may be secured together, such as by welding, or may be held together by friction, such as if the wires are woven into the screen shape. The wires 52 may have a circular cross section, or may have other shapes, such as a square, rectangular or oval cross section. A second flange member 56 is sized to overlie the pipe end flange 46, with the screen member flange portion 48 sandwiched therebetween. A plurality of bolts 58 are arranged to threadingly engage with at least one of the flanges 46, 56 to clampingly secure the screen member 47 between the pipe end flange and the second flange. A gasket 59 may also be provided between the screen member flange portion 48 and the second flange 56 to assist in securing the security cage 40 in place.
The hemispherical shape of the body portion 50 provides a greater surface area for the screen member 47 than is provided when a security screen is merely stretched across a diameter of a pipe opening, thereby allowing for a greater air flow to enter or exit the pipeline, particularly when the screen is partially covered with debris.
In an embodiment, the flanges 46, 56 have a curved interior opening 60 shaped complementary to a contour of the screen member body portion 50.
In an embodiment, the criss-cross arrangement of wires 52 provides a defined size for openings 62 in the screen member 47. The security cage 40 further includes a mesh 64 covering the screen member 47 which has a smaller opening size than the screen member.
The mesh 64 may be used when it is desired to prevent objects smaller than the size of the openings 62 from entering the vent pipe 42. In some installations, the mesh 64 may not be required. The screen member 47 provides support for the mesh 64, which may be made of a relatively light material.
In an embodiment, the second flange member 56 comprises a flange from another pipe member 66 such that the screen member 47 is interposed along a length of a pipe as shown at location 68 in FIG. 1.
In an embodiment, the second flange member 56 is solely a flange, such that the screen member 66 is attached at an end of the vent pipe 42 as shown at locations 70, 72 in FIG. 1.
In an embodiment, the body portion 50 is arranged such that the hemispherical shape of the screen member 47 extends inwardly at the end of the vent pipe 42 as shown at location 70.
In an embodiment as illustrated in FIG. 3, a two-way damper 74 is positioned between the screen member 47 and the pipe flange 46. This two-way damper 74 will normally close the vent pipe 42, and hence provide a passive barrier to air flow, as well as to the introduction of other fluids by unauthorized persons. While many different constructions of dampers 74 may be utilized, including one-way dampers as well as other two-way dampers, the dampers disclosed in U.S. Patent application serial number 11/256,787, filed October 24, 2005, incorporated herein by reference, may be effectively used with the security cage 40 of the present invention.
In an embodiment, the two-way damper 74 comprises a baffle 76 comprising a flexible member with a first portion 80 secured and held in a fixed position by the flanges 46, 56 and a second portion 82 normally oriented in a first position 84, but free to move relative to the first position, a third portion 86, arranged between the first and second portions being flexible and resilient and allowing the second portion to move to a second position 88 relative to the first position upon the application of a pressure differential across the baffle above a threshold pressure (as shown in FIG. 3) and causing the second portion 82 to return to the first position 84 upon the application of a pressure differential across the baffle 74 below the threshold pressure.
In an embodiment as illustrated in FIG. 3, a second screen member 90 (which is identical to screen member 47) is arranged such that the first and second screen members are sandwiched between the two flanges 46, 56 and the two-way damper 74 is sandwiched between the screen members. The mesh 64 may be provided over one or both screen members 47, 90 as needed.
The mesh 64 may be used when it is desired to prevent objects smaller than the size of the openings 62 from entering the vent pipe 42. In some installations, the mesh 64 may not be required. The screen member 47 provides support for the mesh 64, which may be made of a relatively light material.
In an embodiment, the second flange member 56 comprises a flange from another pipe member 66 such that the screen member 47 is interposed along a length of a pipe as shown at location 68 in FIG. 1.
In an embodiment, the second flange member 56 is solely a flange, such that the screen member 66 is attached at an end of the vent pipe 42 as shown at locations 70, 72 in FIG. 1.
In an embodiment, the body portion 50 is arranged such that the hemispherical shape of the screen member 47 extends inwardly at the end of the vent pipe 42 as shown at location 70.
In an embodiment as illustrated in FIG. 3, a two-way damper 74 is positioned between the screen member 47 and the pipe flange 46. This two-way damper 74 will normally close the vent pipe 42, and hence provide a passive barrier to air flow, as well as to the introduction of other fluids by unauthorized persons. While many different constructions of dampers 74 may be utilized, including one-way dampers as well as other two-way dampers, the dampers disclosed in U.S. Patent application serial number 11/256,787, filed October 24, 2005, incorporated herein by reference, may be effectively used with the security cage 40 of the present invention.
In an embodiment, the two-way damper 74 comprises a baffle 76 comprising a flexible member with a first portion 80 secured and held in a fixed position by the flanges 46, 56 and a second portion 82 normally oriented in a first position 84, but free to move relative to the first position, a third portion 86, arranged between the first and second portions being flexible and resilient and allowing the second portion to move to a second position 88 relative to the first position upon the application of a pressure differential across the baffle above a threshold pressure (as shown in FIG. 3) and causing the second portion 82 to return to the first position 84 upon the application of a pressure differential across the baffle 74 below the threshold pressure.
In an embodiment as illustrated in FIG. 3, a second screen member 90 (which is identical to screen member 47) is arranged such that the first and second screen members are sandwiched between the two flanges 46, 56 and the two-way damper 74 is sandwiched between the screen members. The mesh 64 may be provided over one or both screen members 47, 90 as needed.
The hemispherical shape of the screen member 47 allows full movement of the second 82 and third 86 portions of the baffle 76, so that restriction of the movement of air in the vent pipe 42 is minimized when the baffle is in the open position. By providing a screen member 47, 90 on both sides of the baffle 76, the baffle will be protected against debris moving in either direction in the pipeline. In some installations, there may be no chance of debris on the interior side of the vent pipe, and so the second screen member 90 may be omitted when using the baffle 76.
It should be understood that various changes and modifications to the presently preferred embodiments described herein will be apparent to those skilled in the art.
Such changes and modifications may be made without departing from the spirit and scope of the present invention and without diminishing its attendant advantages. It is, therefore, intended that such changes and modifications be covered by the appended claims.
Summary of Reference Numbers in Drawings liquid transport system 22 vault 24 surface grade 26 vent pipe 28 interior 20 30 manhole cover 32 pipeline 34 air valve 36 vent line 40 security cage 42 vent pipe 44 pipe end 46 flange 47 screen member 48 circular flange portion 50 hemispherical body portion 52 wires 54 points of intersection 56 second flange member 58 bolts 60 curved interior opening 62 openings 64 mesh 66 pipe member 68 location along length of vent pipe 70 end of vent pipe location 72 end of vent pipe location 74 two-way damper 76 baffle 80 first portion 82 second portion 84 first position 86 third portion 88 second position 90 second screen member
It should be understood that various changes and modifications to the presently preferred embodiments described herein will be apparent to those skilled in the art.
Such changes and modifications may be made without departing from the spirit and scope of the present invention and without diminishing its attendant advantages. It is, therefore, intended that such changes and modifications be covered by the appended claims.
Summary of Reference Numbers in Drawings liquid transport system 22 vault 24 surface grade 26 vent pipe 28 interior 20 30 manhole cover 32 pipeline 34 air valve 36 vent line 40 security cage 42 vent pipe 44 pipe end 46 flange 47 screen member 48 circular flange portion 50 hemispherical body portion 52 wires 54 points of intersection 56 second flange member 58 bolts 60 curved interior opening 62 openings 64 mesh 66 pipe member 68 location along length of vent pipe 70 end of vent pipe location 72 end of vent pipe location 74 two-way damper 76 baffle 80 first portion 82 second portion 84 first position 86 third portion 88 second position 90 second screen member
Claims (16)
1. A security cage for use with a vent pipe, wherein said vent pipe includes a pipe end with a flange, said security cage comprising:
a screen member having a generally circular flange portion sized to overlie said pipe end flange and surrounding and being integrally connected with a generally hemispherical body portion, said screen member being formed from a plurality of rigid wires intersecting one other in a criss-cross arrangement and engaged with each other at their points of intersection so as to retain said hemispherical shape of said body and said circular shape of said flange, a second flange member sized to overlie said pipe end flange, with said screen member flange sandwiched therebetween, and a plurality of bolts arranged to threadingly engage with at least one of said flanges to clampingly secure said screen member between said pipe end flange and said second flange.
a screen member having a generally circular flange portion sized to overlie said pipe end flange and surrounding and being integrally connected with a generally hemispherical body portion, said screen member being formed from a plurality of rigid wires intersecting one other in a criss-cross arrangement and engaged with each other at their points of intersection so as to retain said hemispherical shape of said body and said circular shape of said flange, a second flange member sized to overlie said pipe end flange, with said screen member flange sandwiched therebetween, and a plurality of bolts arranged to threadingly engage with at least one of said flanges to clampingly secure said screen member between said pipe end flange and said second flange.
2. A security cage according to claim 1, wherein said flanges have a curved interior opening complementary to a contour of said screen member body.
3. A security cage according to claim 1, wherein said criss-cross arrangement of wires provides a defined opening size for said screen member and further including a mesh coving said screen member having a smaller opening size than said screen member.
4. A security cage according to claim 1, wherein said second flange comprises a flange from another pipe member such that said screen member is interposed along a length of a vent pipe.
5. A security cage according to claim 1, wherein said second flange is solely a flange, such that said screen member is attached at an end of said vent pipe.
6. A security cage according to claim 5, wherein said body is arranged such that said hemispherical shape of said screen member extends inwardly at said end of said vent pipe.
7. A security cage according to claim 1, and including a two-way damper positioned between said screen member and said pipe flange.
8. A security cage according to claim 7, wherein said two-way damper comprises a baffle comprising a flexible member with a first portion secured and held in a fixed position by said flanges and a second portion normally oriented in a first position, but free to move relative to said first position, a third portion, arranged between said first and second portions being flexible and resilient and allowing said second portion to move to a second position relative to said first position upon the application of a pressure differential across said baffle above a threshold pressure and causing said second portion to return to said first position upon the application of a pressure differential across said baffle below said threshold pressure.
9. A security cage according to claim 7, including a second screen member arranged such that said first and second screen members are sandwiched between said two flanges and said two-way damper is sandwiched between said screen members.
10. A security arrangement for an air vent pipe wherein the vent pipe is comprised of two pipes joined together at their ends, with each pipe end including a flange surrounding the pipe end for connecting to the other pipe end, said security arrangement comprising:
a first screen member having a generally circular flange portion sized to overlie one of said pipe end flanges and surrounding and being integrally connected with a generally hemispherical body portion which extends into said pipe end whose flange said first screen member overlies, said screen member being formed from a plurality of rigid wires intersecting one other in a criss-cross arrangement and engaged with each other at their points of intersection so as to retain said hemispherical shape of said body and said circular shape of said flange, a second screen member having a generally circular flange portion sized to overlie the other one of said pipe end flanges and surrounding and being integrally connected with a generally hemispherical body portion which extends into said pipe end whose flange said second screen member overlies, said screen member being formed from a plurality of rigid wires intersecting one other in a criss-cross arrangement and engaged with each other at their points of intersection so as to retain said hemispherical shape of said body and said circular shape of said flange, and an air flow damper positioned between said first screen member and said second screen member.
a first screen member having a generally circular flange portion sized to overlie one of said pipe end flanges and surrounding and being integrally connected with a generally hemispherical body portion which extends into said pipe end whose flange said first screen member overlies, said screen member being formed from a plurality of rigid wires intersecting one other in a criss-cross arrangement and engaged with each other at their points of intersection so as to retain said hemispherical shape of said body and said circular shape of said flange, a second screen member having a generally circular flange portion sized to overlie the other one of said pipe end flanges and surrounding and being integrally connected with a generally hemispherical body portion which extends into said pipe end whose flange said second screen member overlies, said screen member being formed from a plurality of rigid wires intersecting one other in a criss-cross arrangement and engaged with each other at their points of intersection so as to retain said hemispherical shape of said body and said circular shape of said flange, and an air flow damper positioned between said first screen member and said second screen member.
11. A security cage according to claim 10, wherein said air flow damper comprises a two-way damper.
12. A security cage according to claim 11, wherein said two-way damper comprises a baffle comprising a flexible member with a first portion secured and held in a fixed position by said flanges and a second portion normally oriented in a first position, but free to move relative to said first position, a third portion, arranged between said first and second portions being flexible and resilient and allowing said second portion to move to a second position relative to said first position upon the application of a pressure differential across said baffle above a threshold pressure and causing said second portion to return to said first position upon the application of a pressure differential across said baffle below said threshold pressure.
13. A security cage according to claim 10, wherein said flanges have a curved interior opening complementary to a contour of said screen member bodies.
14. A security cage according to claim 10, wherein said criss-cross arrangement of wires provides a defined opening size for said screen members and further including a mesh coving at least one of said screen members having a smaller opening size than said screen member.
15. A security cage for use with a vent pipe, said security cage comprising:
a screen member having a generally circular flange portion being integrally connected with a generally hemispherical body portion, said screen member being formed from a plurality of rigid wires intersecting one other in a criss-cross arrangement and engaged with each other at their points of intersection so as to retain said hemispherical shape of said body and said circular shape of said flange.
a screen member having a generally circular flange portion being integrally connected with a generally hemispherical body portion, said screen member being formed from a plurality of rigid wires intersecting one other in a criss-cross arrangement and engaged with each other at their points of intersection so as to retain said hemispherical shape of said body and said circular shape of said flange.
16. A security cage according to claim 15, wherein said criss-cross arrangement of wires provides a defined opening size for said screen member and further including a mesh coving said screen member having a smaller opening size than said screen member.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US11/328,585 | 2006-01-10 | ||
| US11/328,585 US20070161346A1 (en) | 2006-01-10 | 2006-01-10 | Security cage for vent pipes |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2573647A1 true CA2573647A1 (en) | 2007-07-10 |
Family
ID=38233330
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002573647A Abandoned CA2573647A1 (en) | 2006-01-10 | 2007-01-09 | Security cage for vent pipes |
Country Status (2)
| Country | Link |
|---|---|
| US (1) | US20070161346A1 (en) |
| CA (1) | CA2573647A1 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20090072685A1 (en) * | 2007-09-19 | 2009-03-19 | Alcatel Lucent. | Flush to grade underground cabinet |
Family Cites Families (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4321942A (en) * | 1978-10-02 | 1982-03-30 | Duggan Daniel C | Backflow preventer valve |
| US4699045A (en) * | 1986-08-25 | 1987-10-13 | Temp-Vent Corporation | Housing for foundation ventilator |
| US4918017A (en) * | 1989-02-03 | 1990-04-17 | Bridgestone/Firestone, Inc. | Screen assembly for screening elastomeric material |
| US5341767A (en) * | 1993-05-05 | 1994-08-30 | Aos Holding Company | Combustion air inlet diverter plate for a water heater |
| CA2100494C (en) * | 1993-07-14 | 1999-05-11 | Joseph M. Kratochvil | Ventilator |
| JP3738927B2 (en) * | 1997-06-23 | 2006-01-25 | 本田技研工業株式会社 | Muffler spark arrester equipment |
| US5944445A (en) * | 1997-07-10 | 1999-08-31 | Smart Vent, Inc. | Device and method for relieving flooding from enclosed space |
| US6485231B2 (en) * | 1997-07-10 | 2002-11-26 | Smart Vent, Inc. | Foundation flood gate with ventilation |
| US5957373A (en) * | 1998-01-12 | 1999-09-28 | Temp-Vent Corporation | Automatic ventilator with manual override |
| US6463700B2 (en) * | 2000-04-17 | 2002-10-15 | L.B. Plastics Limited | Composite gutter guard |
| US6959457B2 (en) * | 2001-12-17 | 2005-11-01 | Andre Hernandez | Roof vent ingress prevention device |
-
2006
- 2006-01-10 US US11/328,585 patent/US20070161346A1/en not_active Abandoned
-
2007
- 2007-01-09 CA CA002573647A patent/CA2573647A1/en not_active Abandoned
Also Published As
| Publication number | Publication date |
|---|---|
| US20070161346A1 (en) | 2007-07-12 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FZDE | Discontinued |