# US 11,028,961 B1 · Tightening structure of musical instrument stand > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,028,961 B1 - Document ID: US11028961B1 - Status: Granted - Kind: B1 - Application number: 16/727,444 - Filed: 2019-12-26 - Published: 2021-07-01 - Granted: 2021-06-08 - Earliest claimed: 2019-12-26 - Assignees: reMarkable AS - Applicants: REMARKABLE Company - Inventors: Ming Yi Chang - Web page: https://patentgrep.com/patent/US11028961B1 ## CPC - F16M 11/10: around a horizontal axis {(F16M11/12 takes precedence)} - G10D 13/00: Percussion musical instruments; Details or accessories therefor (struck string instruments G10D1/14) - G10D 13/28: {Mountings or supports for individual drums (supports for carrying musical instrument, while playing G10G5/005)} - G10G 5/00: Supports for musical instruments {(cellopins or components therefor G10D3/01)} - F16M 2200/022: by friction - F16M 2200/024: by positive interaction, e.g. male-female connections - F16M: FRAMES, CASINGS OR BEDS OF ENGINES, MACHINES OR APPARATUS, NOT SPECIFIC TO ENGINES, MACHINES OR APPARATUS PROVIDED FOR ELSEWHERE; STANDS; SUPPORTS - 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) - G10G: REPRESENTATION OF MUSIC; RECORDING MUSIC IN NOTATION FORM; ACCESSORIES FOR MUSIC OR MUSICAL INSTRUMENTS NOT OTHERWISE PROVIDED FOR, e.g. SUPPORTS (music stands A47B; non-musical aspects of musical toy instruments A63H5/00; metronomes G04F5/02; teaching music G09B15/00) ## Abstract A tightening structure of a musical instrument stand includes stationary or immovable member and a movable member. The movable member includes a cylindrical shaft extending outward in an axial direction. One side of the immovable member has a recess. A bottom of the recess forms a semi-circular arc with a radius of curvature corresponding to that of the shaft. When the shaft is inserted into the recess it abuts against the bottom of the recess. The immovable member has a screw hole communicating with the recess. The screw hole is perpendicular to the axial direction of the cylindrical shaft. A fastening bolt is screwed into the screw hole. One end of the first fastening bolt is inserted into the recess and has a flared end portion to press against the shaft, and another end is connected with a handle. By rotating the handle, the flared end portion is drawn against the shaft, thereby rendering the movable member stationary. ## Claims ### Claim 1 A tightening structure of a musical instrument stand, comprising: a movable member, having a first connecting portion for connecting a first arm of the musical instrument stand; the movable member being provided with a cylindrical shaft extending outwardly therefrom; an immovable member, having a second connecting portion for connecting a second arm of the musical instrument stand; one side of the immovable member having a recess formed therein, a bottom of the recess forming a semi-circular arc with a radius of curvature corresponding to that of the shaft, the cylindrical shaft being inserted into the recess and abutting against the bottom of the recess; the immovable member being provided with a first screw hole passing through a top portion of the recess, the first screw hole being perpendicular to an axial direction of the cylindrical shaft; a first threaded fastening bolt, screwed in the first screw hole, one end of the first fastening bolt being inserted into the recess and having a flared exterior end portion, another end of the first fastening bolt being connected with a handle; wherein when the handle is rotated, the flared end portion of the first fastening bolt is drawn against the shaft, thereby holding the movable member stationary. ### Claim 2 (depends on 1) The tightening structure of the musical instrument stand as claimed in claim 1, wherein the first connecting portion includes a through hole configured to receive the first arm and an elongate slot that extends parallel to the through hole and intersects with the through hole along their length; the movable member being provided with a second screw hole that enters the elongate slot, a second fastening bolt being screwed into the second screw hole; the elongate slot being provided with an elongate pad having a first side that is pressed by the second fastening bolt and a second side that is in contact with the first arm so as to lock the first arm against movement. ### Claim 3 (depends on 2) The tightening structure of the musical instrument stand as claimed in claim 2, wherein the movable member is provided with a pin hole that enters the elongate slot, the elongate pad being provided with a perforation corresponding in position to the pin hole, and a pin is adapted to be inserted in the pin hole and the perforation. ### Claim 4 (depends on 2) The tightening structure of the musical instrument stand as claimed in claim 2, wherein the second side of the elongate pad is formed with a concave arcuate groove corresponding in shape to a peripheral surface of the first arm.