Patent ID: 7730623

Claim:
A frame jamb marker for a frame having a side surface perpendicularly extended from a marking surface along a common edge, wherein the frame jamb mark comprises: a sliding panel adapted for being slid on said side surface of said frame; and a guiding panel perpendicularly extended from said sliding panel along a common guiding edge for being driven to slide on said marking surface when said sliding panel is slid on said side surface, wherein said guiding panel has a top stepping edge at a topmost edge of said guiding panel, and a bottom stepping edge at a bottommost edge of said guiding panel defining at least a top marking point and at least a bottom marking point at stepping corners at said top and bottom stepping edges respectively, wherein said guiding panel comprises a first guiding portion and a second guiding portion having a length shorter than a length of said first guiding portion, wherein said top stepping edge has a first step portion defined at a top edge of said first guiding portion and a second step portion defined at a top edge of said second guiding portion, wherein said bottom stepping edge has a first step portion defined at a bottom edge of said first guiding portion and a second step portion defined at a bottom edge of said second guiding portion, wherein said second step portions of said top and bottom stepping edges are aligned with top and bottom edges of said sliding panel respectively, thereby, a user is able to point a marker tool on the marking surface at one of said top and bottom marking points, such that when said sliding panel is slid on said side surface of said frame to drive said guiding panel to slid on said marking surface, said marker tool is guided to slidably mark on said marking surface to make a straight marking line thereon so as to precisely form said marking line parallel to said common edge of said frame.