Percussion Instrument Bottom Frame Grooves to Prevent Sink Marks
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Solution Overview
Problem
The formation of reinforcement ribs on the upper surfaces of the radial parts of a percussion instrument's bottom frame can lead to sink marks on the lower surfaces, deteriorating the appearance when the frame is made of resin.
Innovation Solution
The use of concave parts on the lower surfaces of the radial parts, which are formed as grooves extending radially, along with a reinforcement frame made of a more rigid material, to enhance the rigidity and appearance of the bottom frame.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If reinforcement ribs are formed on the upper surfaces of the radial parts, then the rigidity of the bottom frame is improved, but sink marks occur on the lower surfaces of the radial parts, deteriorating the appearance
Solution Approach 1:
Instead of forming reinforcement ribs on the upper surface of the bottom frame, the invention forms concave parts on the lower surface. This inverted approach allows the reinforcement structure to be created on the opposite side, preventing sink marks on the visible upper surface while still providing the necessary rigidity enhancement to the radial parts.
Solution Approach 2:
The reinforcement feature is moved from the upper dimension (upper surface) to the lower dimension (lower surface) of the bottom frame. By creating concave parts on the lower surface rather than ribs on the upper surface, the invention utilizes the third dimension (depth/thickness) to achieve reinforcement without compromising the appearance of the visible surface.
2Object-generated harmful factors
If multiple opening parts are formed in the sensor frame, then vibration release is improved, but the rigidity of the sensor frame is reduced
Solution Approach 1:
The sensor frame is divided into multiple sections by forming opening parts between the radial parts. This segmentation allows vibration to be released through the openings while the radial parts themselves maintain structural integrity. The openings create distinct segments that facilitate vibration release without completely compromising the frame's rigidity.
Solution Approach 2:
The frame structure is made non-uniform by adding radial parts with concave parts at specific locations. These localized reinforcements are positioned strategically to maintain rigidity where needed (in the radial parts) while allowing vibration release in the opening areas between them. Each region of the frame has different properties optimized for its specific function.
Data Source
Figure 1
Figure 2A~2B
Figure 3
AI summary
Concave parts (24a to 24c) formed on lower surfaces of radial parts (21) are formed in a groove shape extending from the side of a central part (20) of a bottom frame (2) toward an outer peripheral side in a radial direction. Accordingly, the formation of ribs in the radial parts (21) of the bottom frame (2) is not required, or the number of ribs that are formed can be reduced, while the rigidity of the bottom frame (2) (radial parts (21)) can be secured by the concave parts (24a). Thus, even in the case where the bottom frame (2) is formed by using resin molding, the sink marks generated in the radial parts (21) can be suppressed. Therefore, the bottom frame (2) can be reinforced by the concave parts (24a to 24c), while the appearance of the percussion instrument (100) can be improved.