Percussive Mallet Head with Threaded Insert for High Pull-Force
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Solution Overview
Problem
Existing percussive instrument mallets often experience connection failures between the head and shaft, leading to usability issues, and challenges in securely bonding materials due to their elasticity and repeated impacts, especially with small shafts and heavy materials.
Innovation Solution
A mallet design featuring a rigid insert with internal threads embedded within a molded polymeric material, allowing for a secure and durable connection between the shaft and head, with the option to incorporate added weights without using hazardous materials, and enabling easy variation in size and shape.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a shaft is inserted directly into a drilled head and secured by a nail, screw, or adhesive, then the mallet can be assembled with simple construction, but the connection between head and shaft fails after a period of use
Solution Approach 1:
A threaded insert is pre-installed into the mallet head before the shaft is attached. This preliminary action creates prepared threading in the head that allows the shaft to be securely fastened with a set screw, eliminating the reliability issues of direct insertion while maintaining manufacturing simplicity.
Solution Approach 2:
A threaded insert acts as an intermediary component between the shaft and the head. This mediator provides a reliable threading interface that neither the shaft nor the head would have on their own, enabling secure connection without compromising the simplicity of the overall assembly process.
2Weight of moving object
If a lead body or weighting member is added into the drilled hole before shaft attachment, then the mass of the mallet head is increased, but the connection complexity increases and may cause splitting of the wooden shaft
Solution Approach 1:
The threaded insert is pre-installed into the head with the weighting member positioned within it before the shaft is attached. This preliminary configuration allows the weight to be securely held in place without requiring complex internal structures or risking shaft splitting, as the insert provides a dedicated cavity and mounting interface.
3Ease of manufacture
If conventional mallet construction methods are used, then manufacturing is simple, but the pulling force resistance is only 45 lbs
Solution Approach 1:
The threaded insert is pre-installed into the head during the manufacturing process before final assembly. This preliminary action creates a robust mechanical interface that can withstand pulling forces up to 300 lbs, while the overall manufacturing process remains simple and suitable for production.
Data Source
AI summary
A percussive instrument mallet includes a molded head, a shaft having an optionally threaded nose, and a rigid insert fixed completely within the head. The insert has an inner profile including threads or other protrusions that mate with the nose of the shaft, and an outer profile that is embedded in the mold material. An outer portion of the insert includes a weighting ring that is also embedded in the mold material. The method includes selecting a tool with an optionally threaded nose and a central bore, threading or otherwise securing an insert onto the nose of the tool, supporting a weight ring on the insert; placing the threaded insert and weight ring in a mold, molding the head while over-molding the weight ring and insert, drawing air out of the head through the central bore, disengaging the tool from the insert, and attaching a mallet shaft into the insert.