Patent ID: 6889581

Claim:
A wrench capable of claiming a screwed member and preventing the screwed member from slipping out of a socket of the wrench and permitting the screwed member to pass through the socket, said wrench comprising: a stem having a head section at one end of the stem; a polygonal socket formed in the head section, the socket having multiple inner angles for fitting onto the screwed member; a substantially C-shaped resilient ring having two ends, the resilient ring being resiliently closable and openable between a closed state and an expanded state to change the diameter of the resilient ring, the resilient ring being disposed at the head section to overlap the circumference of the socket, one end of the resilient ring being fixed end pivotally disposed at the head section, while the other end of the resilient ring being a movable end; and a controlling switch pivotally disposed at the head section and movable between a first position and a second position, the controlling switch being pivotally connected with the movable end of the resilient ring, whereby when operating the controlling switch, the resilient ring is driven to expand or close, in the closed position, the resilient ring obstructing at least one inner angle of the socket, in the expanded position, the resilient ring freeing the inner angle without obstructing the same, and wherein an annular groove is formed on an inner circumference of the socket and the resilient ring is disposed in the inner annular groove.