Abstract This torque wrench comprises a rotatable, driven work-engaging member having a work-engaging lug end portion. An axially alined, first threaded bore extends into said driven member from the other end portion thereof with a serrated first ring face disposed thereon, the teeth thereof having equal lengths and equal angles therebetween. An axially alined, second bore extends into a rotatable driving member and from on end portion thereof, terminating in a seat short of the other end portion thereof. An axially alined third bore, of lesser diameter, extends through said seat. A headed bolt, slidingly fitting the second bore, extends through said second and third bores and threadedly engages threads of the first bore. A second serrated ring face, disposed on the driving member has teeth mating those of the first ring face. Preferably spring washers are stacked on said bolt with a bearing between them and the bolt head. A calibrated window is disposed in the driving member visibly indicating the presence therethrough of a marked portion on the headed bolt, to indicate the extent of compression of the spring means, showing the then wrench torque setting. Screw receiving bores are provided in the driven member. One thereof extends upwardly and into the path of travel of the headed bolt and limiting its extent of travel to an adjusted amount and the maximum torque setting of the wrench. Another thereby extends inwardly and against the shank of the headed bolt and thus locking said headed bolt against inadvertent turning.
A torque wrench comprising a rotatable, driven member having a work-engaging lug disposed at one end portion thereof, an axially alined threaded first bore in said driven member and extending inwardly from the other end portion thereof, and a serrated first ring face on said other end portion and disposed normal to the axis of said first bore, the teeth of said serrated face having sides of equal length and forming equal angles to planes parallel to the axis of the first bore; a rotatable driving member having an axially alined second bore extending inwardly from one end portion of the driving member and terminating in a circular seat disposed normal to the axis of said second bore, and a serrated ring face on the other end portion of the driving member, normal to the axis of said second bore, and mating with the serrations on said first ring face; a headed bolt slidably mounted in the second bore, having a threaded shaft extending into and threadedly engaging the threads in the first bore; compression spring means disposed on said shaft of said bolt and having opposed surfaces providing resilient pressures in opposite directions, one surface thereof resiliently urging against said circular seat of the second bore and the other against the underside of said headed bolt; a fourth threaded bore disposed in said driven member, extending at an angle to the axis of said first bore and connecting with said first bore, and a threaded screw threaded into said fourth bore and movable into and out of engagement with the shaft of said headed bolt threaded into said first bore, said angle of said fourth threaded bore being acute to a line which is coaxial with the axis of the first bore and which line starts at the area of the work-engaging lug, and the internal end portion of said threaded screw in said fourth threaded bore is disposed in the path of travel of the advancing end portion of said headed bolt in said first bore so that the threaded screw in said fourth bore functions as an adjustable stop for said threaded, headed bolt in said first bore; and manually engagable means carried by said driving member for rotating the same.