Drum Pedal Dual-Spring Return Mechanism
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Solution Overview
Problem
The existing pedal devices for bass drums face challenges in increasing the return speed without increasing the force required to depress the pedal, while maintaining the desired loudness and durability, as enhancing the urging force or reducing weight compromises the movability and sound production.
Innovation Solution
The addition of a compression coil spring between the pedal and the base plate, which supplements the urging force of an extension coil spring, allowing for a faster return speed without increasing the depression force and ensuring the pedal follows the drummer's foot movement, along with a strategically positioned absorber to dampen noise and impact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the urging force of the extension coil spring is increased to increase the return speed of the pedal, then the return speed is improved, but the force required to depress the pedal increases
Solution Approach 1:
The urging force mechanism is segmented into two separate springs: the extension coil spring provides the primary return force, while the compression coil spring provides additional urging force only during the return stroke. This segmentation allows the return speed to be enhanced without proportionally increasing the depression force, as the compression spring is only active when pushing the pedal upward.
Solution Approach 2:
The compression coil spring is positioned to contact the pedal only during specific phases of operation (when the pedal is returning to its initial position). This dynamic engagement means the spring's urging force is applied selectively rather than continuously, enhancing return speed while avoiding constant increase in depression resistance.
2Speed
If the weight of the pedal or beater is reduced to increase return speed, then the return speed is improved, but the loudness when beating the drum decreases
Solution Approach 1:
Instead of changing the weight parameter of the pedal or beater, the invention changes the force parameter by introducing the compression coil spring. This allows the return speed to be enhanced through increased urging force rather than reduced mass, thereby maintaining the beater's weight and its ability to produce the desired loudness when striking the drum.
3Speed
If the diameter of the wheel is enlarged to increase return speed, then the return speed is improved, but the pivoting amount of the beater decreases
Solution Approach 1:
The compression coil spring is pre-positioned to provide urging force during the return stroke, preparing the system for faster return movement without requiring changes to the wheel diameter. This preliminary force application enables speed enhancement while preserving the existing mechanical geometry and pivoting characteristics of the beater.
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
This configuration enhances the return speed of the pedal, allowing smoother and quicker movement in sync with the drummer's foot, making the bass drum easier to play without compromising the pedal's movability or sound quality.
Implementation Method 1
a second urging member (50) urging the pedal (12) away from the base (11)... The second urging member (50) adds urging force to the urging force of the first urging member (35) when the beater (15) returns to the suspended position (P1)
Implementation Method 2
A first urging member (35) for holding the beater (15) at the suspended position (P1) and the pedal (12) at the standby position (F1)... The urging force of the first urging member (35) returns the beater (15) to the suspended position (P1)
Data Source
AI summary
A pedal device for a drum includes a base plate, a pedal, a chain, a pivot shaft, a beater, and an extension coil spring. When the pedal is freed from a depressed state, the urging force of the extension coil spring returns the beater from an operation position to a suspended position and returns the pedal to a standby position. A compression coil spring is arranged between the pedal and the base plate.