# US 5,343,792 A · Beater amplitude adjustment device for the base drum pedal mechanism of a base drum

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- Number: US 5,343,792 A
- Document ID: US5343792A
- Status: Granted
- Kind: A
- Application number: 08/120,513
- Filed: 1993-09-14
- Granted: 1994-09-06
- Earliest claimed: 1993-09-14
- Assignees: Hwa Shin Musical Instrument Co., Ltd.
- Inventors: Tsun-Chi Liao
- Web page: https://patentgrep.com/patent/US5343792A

## CPC

- G10D 13/11: Pedals; Pedal mechanisms
- 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

A base drum beater amplitude adjustment device comprised of a beater holder mounted around the revolving shaft of the pedal mechanism of a base drum to hold a beater, and a locating device made of a split cylinder and fastened around the revolving shaft to retain the beater holder in position, the beater holder consisted of two opposing parts connected together around the locating device by screw bolts, whereby the angular position of the beater is adjusted by loosening the screw bolts, then turning the beater holder to the desired angular position around the locating device, and then fastening tight the screw bolts again.

## Claims

### Claim 1

A base drum beater amplitude adjustment device comprising: a revolving shaft supported between two upright supports on the base frame of a pedal mechanism of a base drum; a beater holder mounted around said revolving shaft to hold a beater; and a locating device fastened between said beater holder and said revolving shaft to prevent relative movement between said revolving shaft and said beater holder, said revolving shaft having a polygonal cross section, said locating device being made from a split cylinder having an inner diameter fitting around said polygonal cross section of said revolving shaft and a longitudinal split through the length, said beater holder being comprised of two opposing parts connected together by screw bolts, each part of said beater holder having a respective half-round recess linked to each other and respectively fitted over said locating device.