Percussion Lug Layout for Thinner Drum Housing
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Solution Overview
Problem
Conventional percussion instruments require thick housings due to the need for multiple screw-fastened components, limiting the ability to thin the structure.
Innovation Solution
A percussion instrument design that includes a cylindrical housing with a lug system where the tension bolt is fastened to the outer peripheral side, using a first bolt to fix the lug to the inner surface, allowing for thinner construction while maintaining rigidity through concave parts and a reinforcement frame.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple screw-fastened components are used to secure the tension bolt, then the fastening reliability is improved, but the housing thickness increases
Solution Approach 1:
The patent combines the lug and the fastening structure into an integrated component. The lug body includes both the fastening part for the tension bolt and the fixed part for attachment to the housing, eliminating the need for separate screw-fastened components and reducing housing thickness while maintaining fastening reliability
Solution Approach 2:
The invention transitions from a conventional thick housing structure with multiple external fastening components to a streamlined design where the lug extends in the radial direction from the housing inner surface. This dimensional reorganization allows the tension bolt to be secured without increasing housing thickness in the axial direction
2Length of stationary object
If the housing is thinned, then the weight and size are reduced, but the rigidity and load-bearing capacity decrease
Solution Approach 1:
The patent applies local reinforcement through the lug structure that extends radially from the housing inner surface. The lug includes a fixed part with increased local thickness and rigidity at the attachment point, while the overall housing remains thin. This localized strengthening maintains load-bearing capacity without increasing overall housing dimensions
Solution Approach 2:
The lug structure is pre-designed with optimized geometry and material distribution to provide necessary rigidity before the tension bolt is installed. The fixed part of the lug is configured with sufficient thickness and structural support to bear the tensile load, allowing the housing itself to be thinned without compromising strength
Data Source
Figure 1
Figure 2A~2B
Figure 3
AI summary
[Issue] To provide a percussion instrument and a tensile force application method with which a housing can be thinned. [Solution] A fixed part (72) of a lug (7) extends to an inner peripheral side with respect to an outer peripheral surface of a body part (30) (housing (1)), and is fixed to a lower surface of a bottom frame (2) (housing (1)) by a fixing bolt (B2). Therefore, a tension bolt (B1) for applying a tensile force to a head (4) and the fixing bolt (B2) for fixing the lug (7) to the bottom frame (2) can be disposed alternately in a radial direction. Accordingly, the dimension of the lug (7) in an upper-lower direction can be reduced, and the bottom frame (2) (housing (1)) can be thinned.