Whiteboard marker

A whiteboard marker that uses a coil spring compression dial to squeeze out every last drop of ink

This technology features a whiteboard marker with an ink core wrapped in a waterproof skin inside a body with a protruding nib. Turning a one-way dial reduces the radius of a coil spring wrapped around the skin, compressing the ink core to squeeze out the ink.

Whiteboard markers typically rely on gravity to pull ink toward the nib, which causes fading when the marker is held upright or when ink levels run low. Existing products that use rotating components to compress the ink core often suffer from the core's elasticity causing the dial to reverse, or the long, rod-shaped core buckling, preventing the ink from being properly squeezed out.

This technology uses a ratchet and pawl mechanism to maintain compression and a coil spring to apply uniform radial pressure, preventing buckling and ensuring even compression along the entire length. As the spring tightens, the ink core length decreases, achieving simultaneous radial and longitudinal compression. Suitable for classroom and office markers, it ensures bold writing until the very end while reducing replacement frequency and waste.

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Key Features:

• A whiteboard marker structure where an ink core wrapped in a waterproof skin is housed inside a body with a protruding nib
• A dial mounted on the body to rotate in only one direction, and a coil spring wrapped around the skin with its ends connected to the body and dial, respectively
• A configuration where turning the dial reduces the coil spring's radius to compress the ink core, with the ratchet and pawl maintaining the compressed state
• A configuration where the skin consists of an insertion section with grooves for the coil spring and deformable sections between them, causing the ink core length to decrease as the dial rotates

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