Conduit coupling device with redundancy features

A coupling assembly for releasably interconnecting confronting ends of first and second fluid carrying conduit members wherein a pair of annular flanges are fixedly attached to each of the confronting ends, each flange having an outside shoulder and an inside shoulder spaced from the outside shoulder to define a groove therebetween and a sealing ring positioned in each of the flange grooves, said assembly comprising:

• a sleeve for circumferentially surrounding the sealing rings and the flanges;
• a pair of symmetrical arcuate coupling halves pivotally joined together at first adjacent ends for circumferentially surrounding said sleeve, each of said coupling halves including an arcuate circumferential wall having a pair of spaced ribs extending inwardly from opposite circumferential edges thereof adapted to engage the outside shoulders;
• a pair of raised locking surfaces each spaced inwardly from said opposite circumferential edges, respectfully, located on and extending generally longitudinally of the outer surface of the opposite end of one of said halves;
• a pair of locking tines extending longitudinally from the outer surface of the opposite end of said other of said coupling halves, said locking tines being engageable with said locking surfaces;
• and
• resilient biasing means urging said locking tines laterally outwardly so that said locking tines snap into engagement with said respective locking surfaces to releasably hold said coupling halves in closed position around said sleeve.