Importance

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Abstract

An adjustable click-type torque wrench comprising an elongate, tubular arm with front and rear ends, a work-engaging head on an axis normal to the axis of the arm, an elongate link projecting rearwardly from the head and freely into the arm, a first pivot means connecting the front end portion of the lever to the front end portion of the arm on an axis parallel with the axis of the head, an elongate link with front and rear ends within the arm, a second pivot means connecting the front end of the link to the rear end of the lever on an axis parallel with the first pivot means, an elongate annular fulcrum block engaged about the link between the ends thereof and shiftable circumferentially and longitudinally relative thereto and having an annular outwardly disposed bearing surface with diametrically opposite work load transmitting sides engaging diametrically opposite sides of the interior surface of the arm on a central radial plane of the link which is normal to the axis of said pins, the central axis of the annular bearing surface is angularly related to the central axis of the link, lock means releasably locking the block in set longitudinal and circumferential position on the link, a plunger in the arm rearward from the link, a cam block with flat faces normally in flat engagement with opposing cam seats on the link and plunger and spring means yieldingly urging the plunger forward, the position of the diametrically opposite work load transmitting portions of the bearing surface are moved longitudinally relative to the link, arm and to each other by circumferential movement of the block on the link.

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First Claim