Patent Document ID: 6033282
Application ID: 09244685
Patent Flag: 1

Claim One:
1. A multipurpose built-up measuring device comprising: a plurality of measuring elements detachably assembled, said measuring elements including suitable numbers of connecting rule elements, corner elements, fixing bars, fixing sleeves, and swing elements; said connecting rule element each being a narrow, flat and long member and being provided along two longer edges thereof with internally T-shaped sockets for receiving T-shaped connecting heads correspondingly provided along outer peripheries of a checked board selectively connected to said connecting rule element, on a top surface with two longitudinal rows of symmetrical and equally-spaced insertion holes, and at two distal ends with structurally complementary high and low connection ends that have a thickness being only one half of that of said connecting rule element; and said high connection end being provided at a bottom surface with a downward extended central projection and two longitudinally extended parallel ribs at two outer sides of said projection to correspond to a central through hole and two grooves, respectively, provided on a top surface of said low connection end; said corner element each including a squared flat board having a thickness the same as that of said connecting rule element, an island extending along a diagonal of a top surface of said squared flat board, and two connecting wings extended outward from two adjacent edges of said squared flat board at two sides of said island; said connecting wing being structurally identical to said low connection end of said connecting rule element, said island being provided along a center line thereof with a narrow insertion slot for one said connecting rule element to vertically insert therein, two groups of three recesses being symmetrically cut at two sides of said insertion slot for receiving said downward extended central projection and said two parallel ribs of said connecting rule element vertically inserted in said insertion slot; a first of said two groups of three recesses having a depth for a lower end of said connecting rule element to be flush with a bottom surface of said corner element and a second of said two groups of three recesses have a depth for a lower end of said connecting rule element to be flush with a top surface of said corner element; said fixing bar each including a reduced insertion bar portion having an outer diameter the same as an inner diameter of a central through hole on said connecting wing of said corner element and as an inner diameter of said fixing sleeves and therefore being suitable for extending through said connecting wing of said corner element via said central through hole and into outer end of said fixing sleeve to assemble said corner element and said fixing sleeve together; said fixing sleeve each having an inner diameter the same as the outer diameter of said insertion bar portion of said fixing bar and a length slightly longer than a width of said connecting rule element; and said swing element each including a square board having two connecting portions formed at two opposite sides thereof, said connecting portion each having a structure identical to that of said low connection end of said connecting rule, two wing-like covers separately extending upward and then outward from another two opposite sides of said square board of said swing element and defining an obtuse angle at a bottom surface thereof, so that said swing element can be supported by two spaced and erected corner elements on their corners far away from said two connecting wings to swing relative to said corners.