Abstract: An adjustable spanner, including a stationary jaw and a movable jaw, suitable to be coupled to the stationary jaw in a plurality of different positions in order to engage objects of different sizes, and adjustable coupling means provided between the stationary jaw and the movable jaw. The adjustable coupling means include a substantially flat base, which is fixed to said stationary jaw and which includes a folded portion laterally embracing the movable jaw, in such a way that the stationary jaw and the movable jaw lay substantially on the same plane.

Abstract: An adjustable or similar gripping device includes a shaft and a gripping head which has two jaws, at least one of which is moveable so as to adjust the opening between the jaws of the gripping head. At least one of the jaws has a gear rack which engages a rotatable cog. A spring on the cog urges the jaws into a gripping position. A locking device is provided selectively to prevent movement of the jaw. The locking device includes a locking member which engages between a surface on the cog and a cam located next to the cog. The locking member moves in and out of locking engagement with the cog and the cam.

Abstract: A adjustable open end type wrench having a solid jaw guide that prevents slippage of the movable jaw and relative movement between the jaws thereby virtually eliminating the tendency of such wrenches to loosen under load. The arrangement of this invention replaces the usual worn gear with a wedge and an arrangement that joins the jaw and the wedge through a tension member that passes through or straddles the jaw guide. The jaw guide extends in a direction generally perpendicular to the gripping surfaces of the jaws. The action of the jaw on the wedge pulls the wedge toward the guide and places the guide in compression. Compression on the guide increases the clamping action of the jaw and the wedge and keeps the jaw in place. A relatively simple wedge arrangement will provide the necessary clamping action. Consequently, this invention provides a simple adjustable wrench design wherein slippage of the wedge and consequent loosing of the wrench is essentially eliminated.

Abstract: The self adjusting pipe wrench includes a movable jaw that is spring urged to its closed position with respect to its fixed jaw. A lock element holds the movable jaw in a open, fixed position until it is disengaged from the movable jaw, whereupon the movable jaw moves into engagement with a nut, or the like, or to its closed position. A housing is located about the path of movement of the leg of the movable jaw and extends between the lock element and the joke of a handle to maintain the lock element out of force-bearing relationship with respect to the yoke.