Patent ID: 7287298
Filing Date: 2007-10-30
Classification: A47L

Abstract:
1. A device for maintaining a ground surface, comprising: a housing with a peripheral edge; a squeegee assembly; a plurality of torsion elements connected between said peripheral edge and said assembly, and configured to apply a downward biased force to maintain the squeegee assembly in contact with the ground and wherein each torsion element includes: a link having first and second ends, one of said ends being attached to said housing and the other attached to said assembly; and a bias element at one of said ends connected to said link to provide said downward force and includes: a torsion spring having ends; a mandrel attachable to the housing or assembly, said mandrel securing one end of the torsion spring; and at least one attachment point in said link for securing the other end of the torsion spring and wherein the torsion spring includes a spiral core and wherein said mandrel passes through said spiral core; and wherein said mandrel includes a notch and wherein one end of said torsion spring is rotationally secured within said notch.