# US 12,763,053 B2 · Percussion instrument, bottom frame reinforcement method and percussion instrument manufacturing method > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,763,053 B2 - Document ID: US12763053B2 - Status: Granted - Kind: B2 - Application number: 18/748,042 - Filed: 2024-06-19 - Published: 2025-01-02 - Granted: 2026-10-13 - Earliest claimed: 2023-06-29 - Assignees: Roland Corporation - Applicants: Roland Corporation - Inventors: Ryoken Watanabe - Web page: https://patentgrep.com/patent/US12763053B2 ## CPC - G10H 3/146: {using a membrane, e.g. a drum; Pick-up means for vibrating surfaces, e.g. housing of an instrument} - G10D 13/24: Material for manufacturing percussion musical instruments; Treatment of the material - G10D 13/26: {Mechanical details of electronic drums} - G10H 2230/301: Spint drum rim, i.e. mimicking using or striking the rim of a drum or percussion instrument, rimshot; Interfacing aspects of the generation of different drumsound harmonic contents when a drum sensor is struck closer to the rim - G10H: ELECTROPHONIC MUSICAL INSTRUMENTS; INSTRUMENTS IN WHICH THE TONES ARE GENERATED BY ELECTROMECHANICAL MEANS OR ELECTRONIC GENERATORS, OR IN WHICH THE TONES ARE SYNTHESISED FROM A DATA STORE - G10D: STRINGED MUSICAL INSTRUMENTS; WIND MUSICAL INSTRUMENTS; ACCORDIONS OR CONCERTINAS; PERCUSSION MUSICAL INSTRUMENTS; AEOLIAN HARPS; SINGING-FLAME MUSICAL INSTRUMENTS; MUSICAL INSTRUMENTS NOT OTHERWISE PROVIDED FOR (organs, harmoniums or similar wind musical instruments with associated blowing apparatus G10B; pianos, harpsichords, spinets or similar stringed musical instruments with one or more keyboards G10C; automatic musical instruments G10F; electrophonic musical instruments in which tones are generated by electromechanical means G10H) ## Abstract 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. ## Claims ### Claim 1 A percussion instrument, comprising: a head, forming a percussion surface; a housing, having a body part in a cylindrical shape having an opening on an upper end side covered by the head; and a bottom frame, forming a bottom surface of the housing, wherein the bottom frame comprises: a central part, forming a central portion of the bottom frame; a plurality of radial parts, radially extending from the central part toward an outer edge side of the housing; and an outer peripheral part, connecting outer edges of the plurality of radial parts in a peripheral direction, wherein a concave part extending from a side of the central part toward a side of the outer peripheral part is formed on a lower surface of each of the plurality of radial parts, and a pair of protrusions of each of the plurality of radial parts respectively extend downward from two opposite sides of the concave part in the peripheral direction and extend from the side of the central part toward the side of the outer peripheral part, and a plate of each of the pair of protrusions forms a bottom surface of each of the plurality of radial parts. ### Claim 2 (depends on 1) The percussion instrument as claimed in claim 1, wherein the concave part is formed in a groove shape continuous in a radial direction of the body part. ### Claim 3 (depends on 1) The percussion instrument as claimed in claim 1, comprising: a reinforcement frame, formed by using a material more rigid than the bottom frame, fixed to the outer peripheral part, and having an annular shape, wherein the reinforcement frame comprises a protrusion part protruding toward an inner peripheral side of the reinforcement frame and fixed to each of the plurality of radial parts. ### Claim 4 (depends on 1) The percussion instrument as claimed in claim 1, comprising a fastening part, provided on an outer peripheral side of the body part; and a tension bolt for applying a tensile force to the head by being fastened to the fastening part, wherein the fastening part is provided on an outer peripheral side of the concave part. ### Claim 5 (depends on 1) The percussion instrument as claimed in claim 1, comprising: a head sensor, contacting the head and detecting a vibration when the head is percussed, wherein a convex part having a shape corresponding to the concave part is formed on an upper surface side of each of the plurality of radial parts, and the head sensor is supported by the convex part. ### Claim 6 (depends on 1) The percussion instrument as claimed in claim 1, wherein a portion of each of the plurality of radial parts whose dimension in the peripheral direction gradually decreases or increases toward an outer peripheral side of the bottom frame is formed at each of the plurality of radial parts, and a dimension of the concave part in the peripheral direction is formed to gradually decrease or increase toward the outer peripheral side of the bottom frame in correspondence with a dimension of each of the plurality of radial parts in the peripheral direction. ### Claim 7 A bottom frame reinforcement method, which is a bottom frame reinforcement method in a percussion instrument, the percussion instrument comprising: a head, forming a percussion surface; a housing, having a body part in a cylindrical shape having an opening on an upper end side covered by the head; and a bottom frame, forming a bottom surface of the housing, wherein the bottom frame comprises: a central part, forming a central portion of the bottom frame; a plurality of radial parts, radially extending from the central part toward an outer edge side of the housing; and an outer peripheral part, connecting outer edges of the radial parts in a peripheral direction, the bottom frame reinforcement method comprising: forming a concave part extending from a side of the central part toward a side of the outer peripheral part protrusion on a lower surface of each of the plurality of radial parts, and forming a pair of protrusions of each of the plurality of radial parts respectively extend downward from two opposite sides of the concave part in the peripheral direction and extending from the side of the central part toward the side of the outer peripheral part, and a plate of each of the pair of protrusions forms a bottom surface of each of the plurality of radial parts. ### Claim 8 (depends on 7) The bottom frame reinforcement method as claimed in claim 7, wherein the concave part is formed in a groove shape continuous in a radial direction of the body part. ### Claim 9 (depends on 7) The bottom frame reinforcement method as claimed in claim 7, wherein the percussion instrument comprises: a reinforcement frame, formed by using a material more rigid than the bottom frame, fixed to the outer peripheral part, and having an annular shape, wherein the reinforcement frame comprises a protrusion part protruding toward an inner peripheral side of the reinforcement frame and fixed to each of the plurality of radial parts. ### Claim 10 (depends on 7) The bottom frame reinforcement method as claimed in claim 7, wherein the percussion instrument comprises: a fastening part, provided on an outer peripheral side of the body part; and a tension bolt for applying a tensile force to the head by being fastened to the fastening part, wherein the fastening part is provided on an outer peripheral side of the concave part. ### Claim 11 (depends on 7) The bottom frame reinforcement method as claimed in claim 7, wherein the percussion instrument comprises: a head sensor, contacting the head and detecting a vibration when the head is percussed, wherein a convex part having a shape corresponding to the concave part is formed on an upper surface side of each of the plurality of radial parts, and the head sensor is supported by the convex part. ### Claim 12 (depends on 7) The bottom frame reinforcement method as claimed in claim 7, wherein a portion of each of the plurality of radial parts whose dimension in the peripheral direction gradually decreases or increases toward an outer peripheral side of the bottom frame is formed at each of the plurality of radial parts, and a dimension of the concave part in the peripheral direction is formed to gradually decrease or increase toward the outer peripheral side of the bottom frame in correspondence with a dimension of each of the plurality of radial parts in the peripheral direction.