Patent ID: 7174650
Filing Date: 2007-02-13
Classification: B43L,G01B

Abstract:
1. A ruler square comprising a triangular base being of a right triangular shape having a left edge, a top edge, a hypotenuse edge, a front face, a back face and a thickness, an extendible straightedge element having a top edge, a bottom edge, a front face, a back face with the bottom edge movably attached to the base top edge, said straightedge element having a thickness from the front to the back face being substantially the same thickness of the triangular base and so attached as to permit repositioning the straightedge by sliding the element longitudinally along the base top edge, and a fence element fixed to and integral to the base extending along the left base edge of the triangular base wherein the fence element includes front and back portions projecting oppositely from the front and back faces of the triangular base forming a substantially flat member fixed to the triangular base such that the front and back portions are perpendicular to the base and the fence extending flush with the top edge of the straightedge, having a slot cut to accommodate passage of the straightedge through the fence.