Test glass holder

Claim 1

A test tube rack comprising in combination at least two plates of which the lowermost plate serves to support the bottoms of the test tubes and the other plate has a plurality of holes of approximately the same diameter as the test tubes and serve to guide said test tubes, and at least three support posts detachably connected to the sides of said plates, each of said support posts beiNg in the shape of a rod having a circular section and being provided intermediate its ends with at least two axially spaced grooves the height of which are substantially equal to the thickness of the one of said plates with which it is to cooperate, each of said plates having in its side portions holes having restricted openings sideway of the holes, at least one of each of said plates and support posts having resilient properties enabling said posts to be sideways brought into engagement with said plates by pressing said posts with their grooved parts into engagement with the holes in said plates via said restricted openings thereby overcoming the resistance of the restricted entrance openings, said rods each being in its upper end provided with a bore and in its lower end with a pin thus enabling several test tube racks to be stacked upon each other while resting upon the downwardly projecting pins of the lowermost rack.