String Shooting Device

What is this patent about?

’715 is related to the field of string shooting devices, specifically those designed to propel a continuous loop of string. The background acknowledges the challenge of propelling flexible members due to gravity's effect, leading to short travel distances. Prior art attempts to address this by increasing air friction and speed, or by adjusting the exit angle of the string. However, achieving a stable and visually interesting effect, like a floating string, remains a challenge.

The underlying idea behind ’715 is to use a string with a textured surface that generates significant air friction when propelled. This increased friction creates lift on the string, counteracting gravity and giving the illusion of weightlessness. Furthermore, the design aims to create a tension differential within the string loop, making the outgoing portion slack and more responsive to user movements, enhancing the visual effect.

The claims of ’715 focus on a string propelling device comprising a body, a housing, and a pair of wheels (at least one driven) that propels a string through a gap. Crucially, the claims emphasize string guides that maintain the string's position relative to the driven wheel and within the gap. These guides ensure the string returns to the operational position within the gap and in contact with the driven wheel as a user moves the body.

In practice, the device uses a motor to drive at least one wheel, which frictionally engages and propels the looped string. The housing includes features like a loading slot for easy string replacement and a guide slot to help maintain the string's position on the wheel. The loading slot's curvature and angle are designed to prevent accidental string dislodgement during operation. The string's textured surface, achieved through radiating fibers or a loose weave, is key to generating the necessary lift.

The differentiation from prior approaches lies in the combination of the textured string and the housing design. Smooth strings lack the necessary friction for lift, and prior devices may not effectively manage string tension or provide user control over the string's movement. The interaction between the string guides and the textured string allows for a unique visual effect, where the string appears to float and respond to the user's gestures, creating a more engaging and interactive experience compared to simply shooting a string across a distance.