| 摘要 |
A variable friction assembly for various tools is disclosed. The assembly incorporates materials (22, 24) with a high coefficient of friction and a low coefficient of friction. The materials with a low coefficient of friction may be mounted on a tool (10) and have a retraction mechanism. This retraction mechanism may be implemented with a spring (46). The materials with a high coefficient of friction may be mounted on the tool in a fixed position. The tool may be pressed against a surface, first engaging the materials with a low coefficient of friction. The tool may freely move across the surface while the materials with a low coefficient of friction maintain contact with the surface. As the tool is pressed to the surface, the materials with a high coefficient of friction subsequently make contact with the surface, thereby causing the lateral movement of the tool with respect the surface to be restricted and stabilized. An example of the tool may be a spirit or carpenter level.
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