Abstract: A torque wrench comprising a driving head, an operating arm and an adjustable torque limit signalling means characterized by:a first arm drivingly connected with the driving head,a second arm pivotally coupled to the driving head,a torque limit signalling assembly slidably adjustable in position along one of the arms for selecting a torque limit,the assembly including a non-linear spring means arranged to transmit force between the arms and to signal the occurrence of an abrupt change in spring force in accordance with the selected limit. Preferably the non-linear spring is constituted by a disc washer, and one of the arms is calibrated.

Abstract: A tacker has a magazine to contain staples and a striker movable against a spring biassed to eject the staples from an ejection slot. An integral handle and pawl are provided to engage the striker to move the striker against the spring bias, the pawl being disengageable from the striker to release the striker to enable a staple to be ejected. The arrangement is such that the handle and part of the magazine are spaced apart by such a distance that the handle and the magazine can be grasped by a single hand. The handle, on operation of the device, moving towards the magazine.