Patent ID: 7530758

Claim:
A mechanical device comprising: a first part including a first face having one of a set of two grooves in a chevron configuration or a set of two ribs in a chevron configuration; a second part including a first face having the one of the set of two grooves or the set of two ribs, wherein the first part and the second part are symmetrical with respect to each other; and a third part including a first planar face having a first set of the other one of the set of two grooves or the set of two ribs and a second set of the other one of the set of two grooves or the set of two ribs, wherein the one of the set of two grooves or the set of two ribs and the other one of the set of two grooves or the set of two ribs include complementary shapes and dimensions, wherein the first part, the second part and the third part are assembled together such that the first part and the second part are held spaced apart in a substantially parallel relationship by the third part, such that the one of the set of two grooves or the set of two ribs of the first part mutually engages the first set of the other one of the set of two grooves or the set of two ribs of the third part, and the one of the set of two grooves or the set of two ribs of the second part mutually engages the second set of the other one of the set of two grooves or the set of two ribs of the third part.