Patent Application
20220397207
Exemplary embodiments relate to the art of pressurized containers, and more specifically, to a fail-safe device associated with a removable cap of a pressurized container.
A cap may be used to seal an opening of a pressurized container. When the container is highly pressurized, it will be nearly impossible to remove the cap without a leverage enhancing tool until the pressure of the container is equalized with the ambient atmosphere. Further, if a cap is removed from an opening while the container is pressurized, the pressure acting on the cap can cause the cap to explosively separate from the container. In addition, the pressurized fluid within the container may escape therefrom at a high temperature and/or velocity. Accordingly, accessing the interior of a container while the container is pressurized can result in potential injury to the operator or damage to an article surrounding the container.
According to an embodiment, a container assembly includes a container body having a housing defining an internal compartment and an opening connected to the internal compartment. A cap having an engagement feature is mounted to the housing about the opening. A pressure relief valve is operably coupled with the internal compartment to vent fluid from the internal compartment. The pressure relief valve has a movable member movable between a first position and a second position. When the movable member is in the first position, the movable member is configured to cooperate with the engagement feature to restrict movement of the cap relative to the opening.
In addition to one or more of the features described above, or as an alternative, in further embodiments the pressure relief valve is mounted to the housing at a position adjacent to the opening.
In addition to one or more of the features described above, or as an alternative, in further embodiments an axis of the pressure relief valve is oriented at an angle to an axis of the opening.
In addition to one or more of the features described above, or as an alternative, in further embodiments the axis of the pressure relief valve is perpendicular to the axis of the opening.
In addition to one or more of the features described above, or as an alternative, in further embodiments when the movable member is in the first position, the internal compartment is pressurized, and when the movable member is in the second position, the internal compartment is vented.
In addition to one or more of the features described above, or as an alternative, in further embodiments the engagement feature includes a groove extending about at least a portion of a periphery of the cap.
In addition to one or more of the features described above, or as an alternative, in further embodiments the engagement feature has a similar size and shape to a portion of the movable member with which the engagement feature cooperates.
In addition to one or more of the features described above, or as an alternative, in further embodiments the cap further comprises at least one vent hole, the at least one vent hole being arranged in fluid communication with the engagement feature.
In addition to one or more of the features described above, or as an alternative, in further embodiments when the movable member is in the first position, rotational movement of the cap relative to the opening is restricted.
In addition to one or more of the features described above, or as an alternative, in further embodiments the pressure relief valve further comprises a valve body having a first end and a second end, the first end being arranged adjacent to the cap, wherein the movable member extends through the first end in both the first position and the second position.
In addition to one or more of the features described above, or as an alternative, in further embodiments the engagement feature is located at a pressurized portion of the cap.
In addition to one or more of the features described above, or as an alternative, in further embodiments the engagement feature is located at a non-pressurized portion of the cap.
According to an embodiment, a method of removing a cap from a container includes opening a pressure relief valve arranged in fluid communication with the container when the container is pressurized, equalizing a pressure within the container and an ambient pressure, unlocking a cap relative to the container, and separating the cap from the container.
In addition to one or more of the features described above, or as an alternative, in further embodiments equalizing the pressure within the container and the ambient pressure further comprises providing a fluid flow between the pressure relief valve and the container.
In addition to one or more of the features described above, or as an alternative, in further embodiments equalizing the pressure within the container and the ambient pressure further comprises venting fluid from the container through the pressure relief valve when the container is pressurized.
In addition to one or more of the features described above, or as an alternative, in further embodiments venting fluid from the container through the pressure relief valve when the container is pressurized further comprises venting fluid from the container through at least one vent hole formed in the cap, the at least one vent hole being arranged in fluid communication with an end of the pressure relief valve.
In addition to one or more of the features described above, or as an alternative, in further embodiments the at least one vent hole is formed at the engagement feature.
In addition to one or more of the features described above, or as an alternative, in further embodiments unlocking the cap relative to the container further comprises separating a movable member of the pressure relief valve from an engagement feature of the cap.
In addition to one or more of the features described above, or as an alternative, in further embodiments separating the cap from the container further comprises rotating the cap to threadably decouple the cap from the container.
In addition to one or more of the features described above, or as an alternative, in further embodiments separating the cap from the container further comprises rotating and axially translating the cap to decouple the cap from the container.
The following descriptions should not be considered limiting in any way. With reference to the accompanying drawings, like elements are numbered alike:
A detailed description of one or more embodiments of the disclosed apparatus and method are presented herein by way of exemplification and not limitation with reference to the Figures.
With reference now to
An example of an assembly 30 suitable to selectively close an opening, such as opening 26, of the container 20 is illustrated in more detail in
In the illustrated, non-limiting embodiment, the cap 32 further includes a radially outwardly extending flange 36 that, for example, has a diameter greater than the inner diameter of the opening 26 and, in some embodiments, is greater than or equal to an outer diameter of the housing 22 adjacent to the opening 26. Although the flange 36 is shown as being located at an end of the body 34, embodiments where the flange 36 is arranged at a central portion of the body 34 are also contemplated herein. In embodiments where the cap is removed by hand, the flange 36 may provide an area for a user to easily grasp and rotate the cap 32. As shown, the flange 36 may be positionable adjacent to or in contact with an upper surface 28 of the housing 22 surrounding the opening 26 when the body 34 is received within the opening 26. However, in other embodiments, the flange may be offset from the surface 28 when the body 34 is fully seated within the opening 26. Further, embodiments where the cap 32 does not include a flange 36 are also contemplated herein.
The cap 32 is removably connectable to the housing 22 to close and seal the opening 26. In an embodiment, best shown in
With reference now to
To install the cap 32 within the opening 26, each pin 46 is aligned with and slidably received within the axial component 44a of the receiving groove 44. The cap 32 is then rotated, thereby moving the pin 46 through the circumferential portion 44b of the receiving groove 44 to a position where axial movement of the cap 32 is restricted by one or more surfaces of the housing 22. In an embodiment, the cap 32 includes a boss 48 that may be used to rotate the cap 32 via a wrench or other suitable tool. The boss 48 may be arranged at a first end of the axial body 34, and may be arranged external to, or within the opening 26 when the cap 32 is mounted within the opening 26.
It should be understood that the threaded connection and the bayonet connection described herein are intended as an example only and that embodiments where the cap 32 is removably connected to the housing 22 via another suitable coupling mechanism are also within the scope of the disclosure. Further, embodiments where the body 34 of the cap 32 is receivable about the exterior of the housing 22, rather than within the opening 26, to close and seal the opening 26 are also contemplated herein.
The threaded connection and the bayonet connections illustrated and described herein are intended to take the primary pressure load. The engagement between the cap 32 and the housing 22 may be sufficient to form a seal therebetween. However, in other embodiments, another component may be used to form the seal. In an embodiment, an O-ring, gasket, or other flexible seal wraps about the periphery of the body 34 such that when the cap 32 is installed relative to the opening 26, the seal 44 is configured to directly contact an adjacent surface of the housing 22, such as inner surface 40 for example, to form an air-tight seal between the body 34 and the housing 22. In other embodiments, cap 32 and housing 22 may have matching smooth surfaces to engage and seal without the addition of another part or material.
A pressure relief valve 50 is associated with the cap 32 to further restrict movement of the cap 32 relative to the opening 26 when the container 20 is pressurized. In the illustrated, non-limiting embodiment, the pressure relief valve 50 is mounted to the housing 22 adjacent to the cap 32. The pressure relief valve 50 may be permanently affixed to the housing 22, or alternatively, may be removably coupled therein. Although the pressure relief valve 50 is shown as being threadably coupled to the housing 22, embodiments where the pressure relief valve 50 is integral with the housing and/or embodiments where the pressure relief valve is mounted to the cap 32 via another suitable mechanism are also contemplated herein. Further, as shown, the axis of the pressure relief valve 50, as defined by movement of the movable member (to be described in more detail below), is oriented generally perpendicular to the axis of the opening 26 and the cap 32. However, in other embodiments, the axis of the pressure relief valve 50 may be oriented at another angle to the axis of the cap 32.
An example of a pressure relief valve 50 is shown in more detail in
A movable member 68, also referred to as a valve member, is mounted within the chamber 58. The movable member 68 includes an elongated valve stem 70 and a disc or collar 72 mounted to a portion of the valve stem 70. In the illustrated, non-limiting embodiment, the disc 72 is arranged at a central portion of the valve stem 70. However, the disc 72 may be located at another portion of the valve stem 70, such as at an end thereof for example. A portion of the valve stem 70 is configured to extend through the valve cap 64, to the exterior of the valve body 52. As shown, a handle or lever 74 (see
The movable member 68 is configured to translate between a first position in which the pressure relief valve 50 is normally closed, and a second position in which the pressure relief valve 50 is open. In the first position, a portion of the movable member 68 is arranged in position to substantially seal the opening 60 of the first end 54 of the valve body 52. When in the first position, the disc 72 itself may be used to seal the opening 60, or alternatively, a seal 76, such as an O-ring for example, mounted to the valve stem 70 and/or the disc 72 may seal the opening 60. In the second position, the disc 72 and/or seal 76 are spaced apart from the opening 60 by a distance. As a result, fluid is configured to flow through the opening 60 at the first end 54, into the chamber 58, and out to the ambient atmosphere via the one or more vent holes 66. It should be understood that for embodiments where the container is negatively pressurized (vacuum), when the valve 50 is opened, air will flow in the opposite direction, into the interior of the container 20 to equalize the pressure within the container 20 with the pressure of the ambient atmosphere.
A biasing member 78 (best shown in
Operation of the lever 74 is configured to transform the movable member 68 between the first position and the second position. In the illustrated, non-limiting embodiment, the lever 74 includes a cam surface 80 that is configured to engage an adjacent surface, such as of the valve cap 64 for example. Accordingly, as the lever 74 rotates about an axis from a first configuration to a second configuration, the camming action causes the movable member 68 to translate axially in a direction opposite the bias of the biasing member 78. The cam surface 80 of the lever 74 may be configured to hold the lever 74 in the second configuration, thereby holding the valve open. However, in other embodiments, other mechanisms may be used to hold the movable member 68 in the translated position such that the valve remains open. Further, as the lever 74 is rotated from the second configuration toward the first configuration, and the force opposing the biasing member 78 is removed, the movable member 68 is biased back to the first position. It should be understood that the pressure relief valve 50 illustrated and described herein is intended as an example only and that a pressure relief valve 50 having any suitable configuration is within the scope of the disclosure.
With continued reference to
As shown, an engagement feature 82, such as a groove for example, is formed in a surface of the cap 32 and the distal end 84 of the movable member 68 is receivable therein. The engagement feature 82 may be located at either a pressurized portion of the cap 32 or at a non-pressurized portion of the cap 32. The engagement feature 82 may include one or more of an annular groove that extends about the entire periphery of the body 34, a groove that wraps about only a portion of the outer periphery of the body, an axial groove (see
One or more vent holes 86 arranged in fluid communication with the interior of the container 20 are formed in the body 34 of the cap 32. In an embodiment, at least one vent hole 86 is axially aligned with the one or more engagement features 82 formed therein. Accordingly, when the pressure relief valve 50 is opened by moving the movable member 68 to the second position, fluid, such as pressurized air for example, is configured to flow from the internal compartment 24 of the container 20 to the engagement feature 82 via the at least one vent hole 86 and from the engagement feature 82 into the open first end 54 of the pressure relief valve 50 for release to the ambient atmosphere as previously described.
By restricting movement of the cap 32 using the movable member 68 of a pressure relief valve 50, the pressure relief valve 50 must be opened and pressure must be released from the container 20 prior to removing the cap 32 therefrom. Further, such an assembly provides a fail-safe measure without adding excess components or weight to the system.
The term “about” is intended to include the degree of error associated with measurement of the particular quantity based upon the equipment available at the time of filing the application.
The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the present disclosure. As used herein, the singular forms “a”, “an” and “the” are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms “comprises” and/or “comprising,” when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, element components, and/or groups thereof.
While the present disclosure has been described with reference to an exemplary embodiment or embodiments, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted for elements thereof without departing from the scope of the present disclosure. In addition, many modifications may be made to adapt a particular situation or material to the teachings of the present disclosure without departing from the essential scope thereof. Therefore, it is intended that the present disclosure not be limited to the particular embodiment disclosed as the best mode contemplated for carrying out this present disclosure, but that the present disclosure will include all embodiments falling within the scope of the claims.
