DEWAR BOTTLE VALVE LOCKOUT COVER
A lockout cover for restricting access to ports, valves, regulators and/or gauges shielded by a halo handling ring on top of a Dewar bottle. The lockout cover includes a cap seatable on the halo ring. A hatch on a side of the cap can be pivoted between an open position to allow access to the ports, valves, regulators and gauges, and a closed position to allow locking the cap to the halo ring to block access to the ports, valves, regulators and gauges.
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The present invention relates generally to cryogenic fluid containers and more specifically to valve covers for Dewar bottles.
BACKGROUND ARTA vacuum flask or “Dewar” bottle is a vessel which maintains its contents cold (or hot) with an evacuated space insulating the contents from the environment. Vacuum flasks are used in laboratories and factories to store liquids such as oxygen and nitrogen which become gaseous at well below ambient temperature. The Dewar flask's excellent insulation keeps the contents liquid for a long time without the need for expensive refrigeration equipment, but heat leaking into the extremely cold interior of the bottle slowly boils off the liquid so that a stoppered opening protected by a pressure relief valve is necessary to prevent pressure from building up and shattering the flask. U.S. Pat. No. 872,795 titled “Double Walled Vessel with a Space for a Vacuum between the Walls” was granted to R. Burger on Dec. 3, 1907.
A problem with Dewar bottles in use, particularly outdoors or in other places open to the public, is that the valves and regulators are accessible to unauthorized persons who may adjust or tamper with the valves or regulators. This can interfere with the intended application of the Dewar bottle. Further, cryogenic liquids stored in Dewar bottles are extremely cold, at least around minus 300 degrees F., and their vapors can rapidly freeze human tissue and can cause many common materials such as carbon steel, rubber, and plastics to become brittle or even break under stress. All cryogenic liquids produce large volumes of gas when they vaporize. Even in well-insulated containers cryogenic liquids cannot be maintained in their liquid state indefinitely and, if vaporized in a sealed container, will produce enormous pressures that could explode the container.
U.S. Pat. No. 6,119,718 discloses a cylinder valve safety cover. It is designed to protect a valve possibly on a compressed gas cylinder and it can be locked, but is not intended for a cryogenic Dewar bottle as it would not fit on a tank with a halo ring, and is not very secure as it is made of plastic. U.S. Pat. Nos. 4,678,003; 5,058,758; 5,638,858; 5,845,809; 6,209,749; and 6,247,491 disclose covers for compressed gas cylinder valves but they cannot be locked and do not fit on cryogenic Dewar bottles.
There is, therefore, a need for protecting Dewar bottle valves and regulators from damage and/or unauthorized access.
SUMMARYThe present invention provides a lockout cover for restricting access to ports, valves, regulators and/or gauges shielded by a halo handling ring on top of a Dewar bottle. The lockout cover includes a cap comprising, in a preferred embodiment, a cylindrical wall and a planar lid. The lid has an inside surface on opposite sides of which two pairs of seating hooks face a gap in the wall. The cover is positioned over a Dewar bottle and the pairs of hooks are seated against the halo handling ring. The cap, except for the gap in the wall, covers any valves and regulators on the Dewar bottle. The gap can be closed by a catch box that is hinged to the lid. The catch box has slots which line up with slots in tabs on the wall to accept a locking bolt. The catch box is pivoted to its closed position and the bolt is inserted through the slots in the box and wall tabs. A padlock, for example, is then used to lock the bolt in the catch box to block adjusting, tampering with or stealing the valves or regulators. Only authorized personnel having a key will be able to unlock the box and access the valves and regulators.
As can be seen in the bottom view of
On the inside of cap 102, visible in
A catch 150 is mounted on the underside of the top of catch box 108. When catch box 108 is pivoted to its closed position, slots 124, 134, 126, and 136 line up and the distal end of catch 150 extends under and around the halo ring 44 to meet or nearly meet the inner side of lid 106 and hold the cap 102 on the halo ring. The bottom panel 160 of catch box 108 has an edge 162 which may be scalloped out as shown to leave enough space between edge 162 and the surface of bottle 10 to thread a supply hose from a valve inside cover 100 to the outside environment. In other embodiments, a hose or hoses could be threaded through holes provided elsewhere in cover 100. If it is not necessary to thread a hose out under box 108 then side panels 128 and 130 could be much closer together. Other embodiments could even eliminate catch box 108 and replace it with a pivoted catch having a lock slot suitable to cooperate with slots 124 and 126 of the wall tabs 120 and 122.
Cover 100 also includes a bolt 200 which has a head 202, a shaft 204, and a tip with a hole 206. When catch box 108 is closed to line up slots 124, 134, 126, and 136, the bolt 200 can be inserted through the slots until the head rests on the outer side of the tab where the tip entered and the tip itself sticks out beyond the last tab. The tabs with slots 124, 126, the panels with slots 134, 136, and the bolt 200 together facilitate locking the catch 150 in the closed position.
When cover 100 has been positioned and locked on a Dewar bottle 10, if authorized technicians need to read a gauge(s) (not shown) connected to one of the valves on the bottle and extending beyond the halo ring 44 to inside catch box 108, then they may unlock padlock 210, remove bolt 200, and pivot catch box 108 up out of the way to allow access to the gauge, without having to remove cover 100 from the bottle.
The foregoing specification describes the present invention with reference to a specific embodiment. It will, however, be evident to a skilled artisan that various modifications and changes can be made thereto without departing from the broader spirit and scope of the invention as set forth in the appended claims. For example, a cover in another embodiment could include a cap formed differently; for example the two piece wall and lid combination could be replaced by a single dome-shaped member. Moreover, a skilled artisan, upon reading the disclosure, will readily envision other shapes possessing the same or similar advantages for the cap. Although perforations in the cap are shown as circular, other shapes such as slits may be suitable as well. Also, in addition to the metallic caps discussed herein, a skilled artisan will recognize that other materials may be utilized for fabricating various components or the entire cap. Such materials include, for example, High Density Polyethylene (HDPE) plastics, acetal plastics, and Ultra High Molecular Weight (UHMW) polymers. These and various other embodiments and techniques are all within the scope of the invention. The specification and drawings are, accordingly, to be regarded in an illustrative rather than a restrictive sense.
Claims
1. A cover for a Dewar bottle having a halo ring mounted above a port on top of the bottle, comprising:
- cap means seatable on the halo ring to block access to the port; and
- lockable closure means for holding the cap means on the halo ring.
2. A cover for a Dewar bottle having a circumferential dimension centered on a perpendicular axis, and an end with a handle ring centered on the axis, the cover comprising:
- cap means having an inner side and an outer side; catch means pivotally attached to the cap means for rotating from an open position to a closed position where the catch means prevents removal of the cap means from the handle ring; and
- locking means to facilitate locking the catch means in the closed position.
3. The cover of claim 2 wherein the cap means comprises: a cylindrical wall member and a planar lid member.
4. The cover of claim 3 further comprising seating means on the inner side for limiting movement of the cap means relative to the handle ring.
5. The cover of claim 4 wherein the seating means comprises at least one hook.
6. The cover of claim 5 wherein the seating means comprises at least one pair of hooks.
7. The cover of claim 5 wherein the seating means comprises at least one abutment.
8. The cover of claim 3 wherein:
- the cylindrical wall member has wall ends with outward turned tabs separated by a gap;
- the catch means comprises a catch box having side panels spaced apart by a distance similar to the width of the gap; and
- the locking means comprises slots in each of the tabs and side panels that line up when the catch box is rotated to a closed position, and a bolt having a head, a shaft that slides through the slots, and a shaft tip with a hole.
9. The cover of claim 8 wherein the catch box has a bottom panel with a scalloped recess to permit passage of a hose.
10. The cover of claim 3 wherein the cylindrical wall member has perforations.
11. A cover for a Dewar bottle having a handle ring protecting valves and ports, the cover comprising:
- a cap formed of a cylindrical wall and a lid, the cylindrical wall having a circumferential periphery surrounding the handle ring and the cap covering the controls and ports;
- a catch box giving access to a valve or port, pivotally mounted to a peripheral region of the cap and having an open position and a closed position, the catch box having a hook engaging the handle ring in the closed position; and
- locking means for holding the catch box in the closed position to secure the valve or port.
Type: Application
Filed: Feb 18, 2009
Publication Date: Aug 19, 2010
Applicant: RATERMANN MANUFACTURING INC. (Livermore, CA)
Inventor: George W. Ratermann (Livermore, CA)
Application Number: 12/388,319
International Classification: B65D 41/02 (20060101);