Patent ID: 7526871

Claim:
A machinist's square comprising: a. a body having a pivot mounting arm extending from the body; b. a blade; c. a square pivot rotatably mounting the body to the blade at the pivot mounting arm; d. a dial indicator depicting the relative angular position between the body and the blade; and e. a drive train between the body, the blade, and the indicator, the drive train comprising: i. a driving arm rigidly mounted to the blade, the driving arm defining a contact face; ii. a rocker pivotably mounted to the body at a rocker pivot and rotated by abutting contact with the contact face, the rocker defining a groove; iii. a rack defining a knife blade operably positioned within the groove of the rocker, the rack reciprocally driven by the rocker; and iv. a pinion gear in meshing engagement with the rack, wherein the dial indicator is driven by the pinion gear.