Thermoplastic Drum Shell with Welded Lugs
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Solution Overview
Problem
Existing percussion musical instruments, such as drums, face issues with structural integrity due to drilling for screw lugs, affecting sound wave transmission and requiring labor-intensive assembly, and are limited in size versatility.
Innovation Solution
A percussion instrument structure featuring a tubular shell made of thermoplastic polymeric material with welded screwing lugs, eliminating the need for drilling and allowing easy head mounting and replacement, and a production method using calendering to create tubular shells of varying sizes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If screw lugs are drilled into the shell for fastening and tensioning means, then the assembly can be securely fastened, but the structural continuity of the shell is interrupted and sound wave transmission is affected
Solution Approach 1:
The patent introduces a separate fastening ring that acts as an intermediary element between the shell and the screw lugs. This fastening ring is attached to the shell perimeter without drilling, serving as a mediator that provides secure fastening while preserving the shell's structural continuity and sound wave transmission properties.
Solution Approach 2:
The fastening system is segmented into separate components: the shell, the fastening ring, and the screw lugs. This segmentation allows each component to perform its function independently - the shell maintains its structural integrity for sound transmission, while the fastening ring and screw lugs provide secure attachment without compromising the shell itself.
2Reliability
If traditional drilling and screwing methods are used for assembling fastening means, then secure fastening is achieved, but the assembly operations become labor-consuming
Solution Approach 1:
The fastening ring is pre-attached to the shell perimeter before the screw lugs are installed. This preliminary action simplifies the overall assembly process, as the fastening ring serves as a pre-prepared mounting structure that reduces the complexity and labor required for final assembly operations.
3Ease of manufacture
If plastic moulding technique is used to make the tubular shell, then production is simplified, but the ability to produce shells of different sizes is limited
Solution Approach 1:
The patent employs extrusion technology where the shell dimensions are controlled by changing extrusion parameters rather than using fixed moulds. This allows the same extrusion process to produce shells of different sizes and diameters by adjusting parameters such as extrusion speed, temperature, and die opening, thereby maintaining production simplicity while achieving size versatility.
Solution Approach 2:
The extrusion process serves as a universal manufacturing method that can produce tubular shells of various sizes and configurations through a single process type. This multi-functional capability allows the same production system to create different drum sizes without requiring separate moulds for each size category.
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
Enhances sound wave transmission and simplifies assembly while enabling production of drums with diverse dimensions and sonorities, reducing production complexity and cost.
Implementation Method 1
a production method using calendering to create tubular shells of varying sizes
Implementation Method 2
welded screwing lugs
Data Source
AI summary
A structure of a percussion musical instrument, such as a drum and the like, includes: a tubular shell having a main axis of symmetry (X); at least one membrane, the membrane being attached to a perimeter bearing hoop; a tensioning hoop for the at least one membrane, configured to be arranged above the bearing hoop and to be constrained to the tubular shell; a fastener and tensioner configured to constrain the tensioning hoop to the tubular shell in a direction substantially parallel to the main axis (X) of the tubular shell. The tubular shell can be a single body made of thermoplastic polymeric material.