Detachable jaw-locking device for an adjustable pipe wrench

A device adapted for attachment to an adjustable wrench for enclosing the open end thereof, comprising:

• an extendable locking member having an attachment end and an enlarged locking end and being adapted with means to permit releasable fixation of said extendable locking member at different positions on said adjustable wrench in a closed position across the open end of said adjustable wrench;
• means for attaching said attachment end to said adjustable wrench;
• means for securing said locking end to said adjustable wrench and permitting subsequent detachment of said locking end therefrom, said securing means comprising a U-shaped catch having a slot narrower than the enlarged locking end, said catch being adapted for slideable fixation at various positions along said adjustable wrench, said catch being capable of receiving said enlarged locking end in seated configuration with the extendable locking member in a closed position with respect to the jaws of the adjustable wrench;
• and
• said respective attaching and securing means being adapted for attachment to the wrench on opposing sides of its open end so as to allow extension and locking of said extendable locking member across the open end, despite changes in jaw opening size.