Drum Pedal Tension Spring Pivot Fulcrum Reducing Horizontal Force
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Solution Overview
Problem
The existing pedal devices for drums suffer from reduced operability due to increased pivot angles of tension coil springs, which lead to increased horizontal force components and friction, making the pedal movement less smooth and less efficient.
Innovation Solution
The pedal device design includes a unit body with a bracket that supports the tension coil spring in a manner allowing it to swing with a lower pivot fulcrum on its lower surface, reducing the pivot angle and horizontal force component, and features a projection and recess structure to minimize friction and stabilize the spring during operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the tension coil spring is allowed to swing back and forth with a large pivot angle, then the spring can accommodate the pedal motion, but the horizontal force component increases and the entire pedal device swings back and forth, reducing operability
Solution Approach 1:
The invention changes the swing dimension from horizontal to vertical by repositioning the fulcrum on the lower surface of the bracket. This allows the spring to swing in a vertical plane rather than a horizontal plane, accommodating pedal motion while preventing horizontal swinging of the entire pedal device, thus resolving the contradiction between adaptability and ease of operation
2Adaptability or versatility
If the pivot angle of the tension coil spring is increased, then the spring can follow the pedal motion, but the force of friction between the spring and bolt increases, reducing smooth movement and operability
Solution Approach 1:
By moving the fulcrum to the lower surface and changing the swing plane from horizontal to vertical, the invention reduces friction between the spring and bolt while maintaining the spring's ability to accommodate pedal motion through vertical swinging, thus resolving the contradiction between motion range and smoothness
3Adaptability or versatility
If the tension coil spring swings back and forth with a large angle, then it can accommodate the full range of pedal motion, but the horizontal force component acting on the fulcrum increases, making the pedal device unstable
Solution Approach 1:
The invention stabilizes the pedal device by changing the spring's swing plane from horizontal to vertical through fulcrum repositioning. This eliminates horizontal force components that cause instability while preserving the spring's ability to accommodate full pedal motion through vertical swinging
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 design enhances the operability of the pedal by reducing the pivot angle and friction, resulting in smoother and more efficient movement, while also allowing for finer tension control and stability of the spring.
Implementation Method 1
a spring with an upper end coupled to the crank arm and a lower end coupled to the unit body... The pedal is held in a standby position by the spring while the axis of the spring lies in a common plane with a reference line connecting the lower end of the spring and a rotation center of the crank arm
Data Source
AI summary
A drum pedal includes a unit body, a pedal, a chain belt, a shaft, a beater, and a tension coil spring. The tension coil spring has a lower end coupled through a bolt, an adjusting nut, and a locking nut to a bracket fixed to a column. The tension coil spring pivots together with the bolt and the adjusting and locking nuts relative to the bracket. A pivot fulcrum of the tension coil spring is provided on the lower surface of the bracket contacting the adjusting nut.