| 摘要 |
A non-marring drawing instrument includes a rolling member for supporting the body of the instrument on a drawing surface in spaced apart relation thereto. The rolling member is mounted on the body for movement between respective rolling and locked positions of the member projecting from the body. A resilient member constrains the rolling member in its rolling position, for rolling movement of the instrument on the drawing surface, and yields for movement of the rolling member into its locked position. Frictional braking structure, which may include the resilient member, engages the rolling member in its locked position, for immobilizing the instrument. Braking is accomplished by pressing the instrument body towards the drawing surface.
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