Tool for cutting sandwich type plaster boards

A tool for forming separation lines in the upper and lower faces of a horizontal board-like workpiece in uniformly spaced relation relative to an edge surface thereof, comprising:

• (a) a pair of rolling cutting blades (1, 2);
• (b) holding means (9) supporting said blades for rotation in a common cutting plane adjacent the upper and lower surfaces of the workpiece in parallel spaced relation to the workpiece edge surface, comprising:
• (1) a unitary U-shaped bracket (10) including a pair of parallel horizontal vertically-spaced leg portions having first ends connected by an integral bridging portion, said leg portions including second ends carrying a pair of outwardly bent orthogonally arranged integral vertical flange portions (11, 12), respectively;
• (2) a pair of holding members (7, 8) rotatably supporting said cutting blades, respectively;
• and
• (3) first adjustment means (36, 13) connecting each of said holding members for vertical adjustment relative to said flange portions, respectively;
• (c) guide means (19) for guiding said blades for cutting movement along lines of cut spaced a given distance from the workpiece edge surface, respectively, said guide means including an elongated guide body having:
• (1) a horizontal first guide face (21) for engaging the upper face of the workpiece;
• and
• (2) a vertical second guide face (22) parallel with said cutting plane for engaging the edge surface of the workpiece;
• (3) said guide body being arranged normal to said bracket means and including an end portion carrying a positioning stud (14) that extends within the space defined between said bracket leg portions;
• (d) second adjustment means (15) connecting said bracket means for adjustment in a direction transverse of said guide body, thereby to vary the distance between said cutting plane and the edge of the workpiece;
• and
• (e) handle means (23) integral with said guide body for arranging said guide body with its first and second guide faces in engagement with the corresponding surfaces of the workpiece, and for horizontal displacing said guide body in a direction parallel with said cutting plane.