Title: Locking device for connectors and closures

Abstract: A locking device for connectors or closures which device prevents rotation of the means for holding a pair of members in engagement wherein the locking device includes a shield which overlies all surfaces on the locking device which might be engaged by a wrench to rotate the locking device while the closure is subjected to pressure. The locking device includes a pressure responsive member exposed to pressure within the closure which carries the shield and positions the shield to overlie all surfaces on the device on which a wrench may be placed and when there is no pressure differential across the pressure responsive member permits the shield to be moved to an out of the way position exposing a wrench surface.

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Inventors: Raver, Clarence L. (Houston, TX)

Application Number: 06/309714
Filing Date: 1981-10-08
Publication_date: 1983-01-11
Assignee: THORNHILL CRAVER COMPANY

Primary Class(es): 220/316 285/919, 285/90, 220/298
Other Classes: F16J13/24; F16J13/00; B65D45/00
US Patent Ref:

2869752	January, 1959	Hall	220/298	Locking device for closures
2943869	July, 1960	Nordin	285/90	Couplings and safety devices therefor
3990605	November, 1976	Hanke et al.	220/316	Closure means for circular openings of large diameter

Other Refs:
Primary Examiner: Hall, George T.
Assistant Examiner:
Attorney: Vinson & Elkins

Claims:

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