Percussion Attachment Locking Mechanism for Drum Rim Stress
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Solution Overview
Problem
Traditional percussion attachments for instruments like drums suffer from hoop damage and looseness or tightness issues due to stress and rotation of tension bolts during performance, limiting versatility.
Innovation Solution
A percussion attachment design featuring an extended part tightened with one tension bolt, with a restricting part to reduce hoop stress and prevent bolt rotation, using a bolt supporting part with a U-shaped recess to simplify installation and restrict displacement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If one tension bolt is used to tighten the percussion attachment with the rim, then the device complexity is reduced, but the tension bolt easily rotates around its axis causing looseness or tightness during performance
Solution Approach 1:
A locking member is introduced as an intermediary component between the tension bolt and the attachment body. This locking member engages with a groove on the tension bolt and a corresponding protrusion on the attachment body, preventing rotational movement while allowing the single tension bolt to maintain secure fastening throughout performance
Solution Approach 2:
The solution moves from a one-dimensional fastening problem (linear tightening force) to a two-dimensional solution by adding radial engagement features (groove and protrusion) that constrain rotational movement, thereby stabilizing the single tension bolt against multi-directional stresses
2Reliability
If two tension bolts are used to tighten the percussion attachment with the rim, then the tension bolts can be prevented from rotating around their axes, but the percussion instruments have to satisfy certain conditions such as specific interval between adjacent tension bolts or specific curvature of the rim, reducing versatility
Solution Approach 1:
The locking member design with groove-protrusion engagement creates a universal fastening mechanism that works with a single tension bolt regardless of rim curvature or bolt spacing requirements. This universal solution eliminates the need for specific instrument conditions, allowing the attachment to be mounted on various drum sizes and rim types
3Device complexity
If the percussion attachment is supported only through a part tightened with the rim by tension bolts, then the device complexity is reduced, but the rim receives large stress when being struck causing damage to the rim
Solution Approach 1:
The attachment body is divided into multiple parts: a main body portion that contacts the rim, and an extended part that distributes the impact force. The locking member is also segmented with distinct engagement features that separate the fastening function from the impact resistance function, allowing the rim to receive distributed rather than concentrated stress
Data Source
Figure 1
Figure 2A~2C
Figure 3A~3B
AI summary
A percussion attachment is provided to be detachably installed on a percussion instrument. The percussion instrument comprises a plurality of tension bolts applying a tension to a head part through a hoop . The percussion attachment includes a main body part having a struck part to be struck by a player, an extended part extending from a side surface of the main body part to be locked to one of the tension bolts, and a restricting part protruding from the side surface of the main body part near the extended part and supporting the percussion instrument to restrict a displacement of the main body part in a state that the extended part is tightened together with the hoop by one of the tension bolts.