Noise Generating Device with Rotating Disc and Resilient Finger
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Solution Overview
Problem
Conventional football rattles are dangerous when swung around the head and lack directional control and volume variation in sound production, making them potentially hazardous and annoying to nearby spectators.
Innovation Solution
A noise-generating device with a disc rotatably mounted to an axle at right angles to the handle, featuring resiliently deformable or rigid finger and projections that create a clacking sound through engagement and deflection, allowing for controlled sound generation and directionality without the need for violent swinging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If the device is swung about the head to generate sound, then the rattling sound is produced, but it becomes dangerous to nearby people
Solution Approach 1:
Instead of swinging the entire handle about the head as in conventional rattles, this invention inverts the approach by having the user hold the handle steady and rotate only the disc component. This inversion eliminates the dangerous swinging motion while preserving the noise-generating function through the interaction between the rotating disc projections and the resilient finger.
Solution Approach 2:
The device is segmented into distinct functional components: a handle for safe holding, a rotatable disc for sound generation, and a resilient finger for amplification. This segmentation allows the noise-generating elements (disc and finger) to be isolated from the user's body, eliminating the danger of swinging the entire device about the head while maintaining operational effectiveness.
2Object-generated harmful factors
If conventional star-wheel mechanism is used, then rattling sound is produced, but there is no directional control of sound
Solution Approach 1:
The invention adds directional control by incorporating a horn or shell extension that projects in a specific direction. This dimensional addition allows the sound to be focused and directed toward a particular area, enabling spectators in certain directions to enjoy the sound while those in other directions are not affected, thus providing spatial adaptability.
3Object-generated harmful factors
If the disc rotates with projections engaging the finger, then clacking sound is produced, but the mechanism complexity increases
Solution Approach 1:
The invention merges multiple functions into a compact mechanism: the rotating disc provides both the primary clacking sound through its projections engaging the finger, and the resilient finger simultaneously amplifies this sound and adds its own clacking component. This merging of functions achieves high sound volume without proportionally increasing mechanism complexity.
Solution Approach 2:
The sound characteristics are controlled by changing parameters such as the number of projections on the disc, the resilience and dimensions of the finger, and the rotation speed. These parameter adjustments allow variation in sound volume and character without requiring fundamental changes to the mechanism structure, maintaining simplicity while achieving versatility.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The device produces a louder and more controllable sound with directional amplification, reducing the risk of injury to nearby people and providing versatile sound generation options, suitable for uses beyond football rattles like vehicle warnings and bird scaring.
Implementation Method 1
as the finger or the projection leaves one projection or the finger, respectively, it strikes the neighbouring one projection or the finger, respectively, sharply to create a clacking sound
Implementation Method 2
the either the finger or the projections to be resiliently deformable
Data Source
Figure 1
Figure 2
AI summary
Disclosed herein is a device for generating noise. The device (1) comprises a handle (2) having an axle (3a), a disc (6) rotatably mounted to the axle (3a) and a plurality of projections (8) arranged around the disc (6) configured to engage with a finger (9) mounted on the handle (2). The projections (8) and/or the finger (9) are resiliently deformable.