Patent ID: 7484313

Claim:
An adjustable carpenters square, the carpenters square comprised of a tape holder and a tape cassette, the tape holder possessing an upper side and an under side, the tape holder possessing an elongated rectangular piece of material, the tape holder upper side possessing a tape cassette holder to which the tape cassette is attached removably, the tape holder upper side also possessing a tape guide which extends the length of the tape holder from the tape cassette holder to the end of the tape holder, the tape guide possessing an angled piece of material open at one side, the tape cassette possessing a long, flexible measuring tape that can be pulled out of the tape cassette and extended through the tape guide to the end of the tape holder, the tape holder under side possessing a straight edge raised above the surface of the tape holder under side, extending from one end of the tape holder underside to the other along the longer dimension, the tape holder under side possessing two adjustable arms, each arm attached at the end of the tape holder underside away from the tape cassette holder, each adjustable arm attached rotatably to the tape holder underside by means of a pivot point, the pivot points placed on either side of the straight edge, the adjustable arms each possessing a plurality of guide holes punched through their material in a semi circle, the positioning of the guide holes at regular angular displacements around the pivot point, the underside of the tape holder possessing two spring-loaded bearings, each spring loaded bearing placed on the tape holder underside such that the bearing will push up through the guide holes when the adjustable arm is positioned at a preselected angle with respect to the pivot point, the adjustable arms held adjustably and firmly by means of the spring-loaded bearing extending upwards through the guide holes.