Patent ID: 6675490
Filing Date: 2004-01-13
Classification: G01C

Abstract:
A level comprising:an extruded thin wall frame structure having an opening of I-shaped configuration extending from end to end thereof; said thin wall frame structure including a pair of elongated operative walls each having a pair of transversely spaced inwardly turned flanges defining the width thereof and an exterior operative surface extending between the flanges thereof, a pair of angular walls extending from each pair of spaced flanges in converging relation with one another and a pair of central walls spaced apart in the direction of the width of said operative walls a distance less than the width of said operative walls integrally interconnected between the pairs of angular walls extending from said flanges, wherein said central walls are generally parallel with respect to each other, said opening of I-shaped configuration including an open space extending between said pair of elongated operative walls, between said pair of angular walls and between said pair of central walls from end to end of said thin wall frame structure; an end member closing the opening at each end of said thin wall frame structure, each end member having structure constructed and arranged to cooperate with the configuration of said thin wall frame structure to fixedly secure each end member in closing relation with respect to the associated end of said thin wall frame structure; and a level indicating vial system having structure constructed and arranged to cooperate with the configuration of said thin wall frame structure to fixedly secure the level indicating vial system therein.