A wrench has a wrench head, an extendable shaft and a shaft locking device. The extendable shaft has a first shaft portion that extends from the wrench head and a second shaft portion that telescopes with respect to the first shaft portion. The locking device is configured to be movable inwardly of the extendable shaft from a locking condition to a release condition in which telescoping of the second shaft portion is permitted.

A wrench extension assembly for increasing an effective length of a wrench includes a sleeve that has a slot extending through an outer wall of the sleeve such that a wrench is insertable into the sleeve. The slot accommodates a head of the wrench to increase leverage a user can apply to the wrench. The slot has an entry portion curving into a straightened portion. A channel is integrated into an interior of the sleeve thereby facilitating the channel to insertably receive the head of the wrench. Furthermore, the channel inhibits the head from tipping in the sleeve thereby inhibiting the wrench from tipping in the sleeve when the user is employing the wrench to loosen or tighten a fastener.

A telescopic wrench includes an outer tube, an outer sleeve, and an inner rod. The first hole of the outer sleeve ring is fitted onto the outer tube, and the second hole of the outer sleeve provides peripheral contact with the rod section of the inner rod. The outer sleeve forms an external auxiliary fitting structure with the inner rod and outer tube. The telescopic wrench provides an improvement over known structures that are prone to loosening and noise during use. The telescopic wrench enhances the structural strength when subjected to operating forces.

An example torque wrench is provided. The example torque wrench may include a drive head configured to engage with a tool for rotating a fastener. The drive head may have a drive axis about which the drive head rotates when rotating the fastener. The torque wrench may also include a deflection member coupled to the drive head and an outer body coupled to the deflection member at a first loading point and a second loading point. The torque wrench may also include a first strain gauge coupled to the deflection member between the drive head and the first loading point, and a second strain gauge coupled to the deflection member between the first loading point and the second loading point.

A pipe wrench is provided with an extendable handle that fits within a cavity of the head. A lever locks the extended length of the extendable handle along a continuous spectrum between a maximum and a minimum extension of the handle. The lever includes cam surfaces. In an unlocked position, the thickness of the lever between the pivot and a friction plate is less than the thickness between the pivot and the friction plate in the locked position. The friction plate is a composite comprising a top lever plate, a midsection, and a concave surface. The lever plate and concave surface include hard, durable materials, and the midsection is a soft elastic material that redistributes frictional forces across the frictional block. The channel-lock prevents inadvertent overextension and/or accidental removal of the extendable handle.

A screw turning device, comprising a screw turning mechanism and an extension mechanism. The screw turning mechanism is provided with one or more accommodating grooves and one or more limiting structures. The accommodating grooves and the limiting structures cooperate to allow a screw to be seized within the screw turning mechanism. The screw turning mechanism and the extension mechanism cooperate to realize screw-tightening operations from the ground to high altitudes. The screw turning mechanism is used to secure the screws that need to be installed. By coordinating the extension mechanism with the screw turning mechanism, it can perform high-altitude screw-tightening operations from the ground, making the process convenient, quick, and safe.