Carpenter's tri-square mfr. - using base as one arm to which other arm is screwed

摘要

The manufacture of a right angle square where one arm has a base depends on the length of the arms. Long arm squares are made by screwing an arm independently to a base to eliminate welding, grinding and thermal stabilisation processes. A monobloc arm (20) of a square has a straight end which is screwed (24) to a base (23). A cut corner (22) on the arm permits its disengagement from the base. The base forms the arm at right angles to form a orthogonal assembly. A stop piece port (25) screwed to the base has a thickness (E) which is approximately that of the vertical arm and which is aligned with it.