Locking system and method for rotary closure assembly
First Claim
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1. An apparatus for locking a closure assembly in a closed position, the apparatus comprising:
- a hub having an opening therethrough;
at least one first lug projecting from the hub;
a head having at least one second lug projecting from the head, wherein the head is rotatable between an unlocked position where the lugs do not interfere with each other and the head may be removed from the hub, and a closed position where the lugs at least partially overlap each other and interfere with each other so that the head is held in a sealing engagement with the hub; and
a vent bore passing through at least one of the head and the hub;
a first locking bore passing through the head;
a second locking bore extending at least partially into the hub that is aligned with the first locking bore when the head is in the closed position; and
a seal and lock device including a sealing element that seals the vent bore and a projection that projects into the first and second bores when the head is in the closed position and the sealing element is sealing the vent bore.
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Abstract
A system and method is provided for locking a lug-type rotary closure assembly in a closed position. The locking arrangement includes a pressure warning device, which may also release internal pressure. The system cannot be unlocked and hence the closure cannot be opened, until the pressure warning device has been moved to a position where it will warn of internal pressure and/or release internal pressure.
8 Citations
20 Claims
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1. An apparatus for locking a closure assembly in a closed position, the apparatus comprising:
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a hub having an opening therethrough;
at least one first lug projecting from the hub;
a head having at least one second lug projecting from the head, wherein the head is rotatable between an unlocked position where the lugs do not interfere with each other and the head may be removed from the hub, and a closed position where the lugs at least partially overlap each other and interfere with each other so that the head is held in a sealing engagement with the hub; and
a vent bore passing through at least one of the head and the hub;
a first locking bore passing through the head;
a second locking bore extending at least partially into the hub that is aligned with the first locking bore when the head is in the closed position; and
a seal and lock device including a sealing element that seals the vent bore and a projection that projects into the first and second bores when the head is in the closed position and the sealing element is sealing the vent bore. - View Dependent Claims (2, 3, 4, 5, 12)
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6. An apparatus for locking a closure assembly in a closed position, the apparatus comprising:
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a hub having an opening therethrough;
a head removably attachable to the hub via a lug-type holding arrangement and movable between an open position and a closed position;
a releaseable lock element movable between an unlocked position; and
a locked position that locks the head in the closed position; and
a pressure warning/release device movable between a sealed position and a warning position, and which is operably connected to the locking element so that the pressure warning/release device must be in the warning/release position in order for the locking element to be unlocked. - View Dependent Claims (7, 8, 9, 10)
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11. An apparatus for locking a closure assembly in a closed position for use with a hub having an opening therethrough and a head removably attachable to the hub via a lug-type holding arrangement, the apparatus comprising:
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a releaseable locking means moveable between an unlocked position; and
a locked position which locks the head in a closed position; and
a pressure warning/releasing means moveable between a sealed position and a warning position, said warning means operably connected to the locking means type so that the pressure warning/releasing means must be in a warning/releasing position in order for the locking means to be unlocked. - View Dependent Claims (13, 14, 15, 17, 18, 19, 20)
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16. A method for locking a closure assembly in a closed position for use with a hub having an opening therethrough and a head removably attachable to the hub via a lug-type holding arrangement, the method comprising:
moving a pressure warning/release device from a sealed position to a warning position, the warning/release device operably connected to a locking device that operates to withdraw a projection from the lug-type holding arrangement, so that the pressure warning/release device must be in a warning position in order for the locking device to be unlocked.
Specification