Abstract: A folding guitar stand includes a top member, two legs pivotably connected to a hollow bottom side of the top member, two connecting rods pivotably connected to the legs for supporting a guitar, and two foot members respectively fixed to the legs at the bottom, with each foot member having two balance rods being pivotable in opposite directions for supporting the stand on the ground.

Abstract: A seat stem positioning structure for a chair for drummer, including an internally threaded seat stem connector shaped like a stepped tube and fastened to a tubular central shaft and equipped with pivoted legs for supporting on the ground, a threaded seat stem having a screw section threaded into the seat stem connector to hold a seat for sitting, and a clamping device fastened to the seat stem connector and the threaded seat stem by fastening means to firmly secure them together, the clamping device including two hinged clamping plates having a respective connecting plate at the respective free end fastened to each other by a screw and a wing nut, and a respective downward locating rod forced into engagement with a respective locating notch in a step at the seat stem connector.

Abstract: A control device coupled between the pull rod of the stand of a hi-hat cymbal and the foot pedal thereof and driven by the foot pedal to operate the cymbals of the hi-hat cymbal, the device including a coupling block coupled to the pull rod of the stand of the hi-hat cymbal by a universal joint and suspended in a base frame to hold two balance bars, a first connecting block and a second connecting block transversely connected between the balance bars at two opposite sides, a linking mechanism coupled between the first connecting block and the foot pedal, and a counterweight coupled between the second connecting block and a locating block to keep the balance bars in horizontal when the foot pedal is not depressed.

Abstract: A device holder for drums, including a base frame having two eyed lugs bilaterally disposed at one end and a bolt hole spaced between the eyed lugs and a longitudinal open-ended slot at an opposite end, box end bolt inserted through the through hole of the base frame and screwed up with a wing nut to hold a rod member with an instrument in the eyed lugs, an arched retaining block having a fixed end pivoted to the base frame in the middle and a free end, and a locating bolt having a head pivoted to the free end of the arched retaining block and a screw body detachably secured to the longitudinal open-ended slot of the base frame by a wing nut to secure the curved retaining block and the base frame to one tie rod between two counterloops of a drum.

Abstract: A pedal assembly for use in for use in a musical instrument, including a base plate, and a pedal unit, the base plate having two upright lugs and two key holes spaced between the upright lugs for mounting the pedal unit, the upright lugs having a respective backward coupling notch, the pedal unit having a mounting frame secured to the key holes of the base plate by tie screws, and two locating elements fixedly mounted at two opposite sides of the mounting frame and detachably coupled to the backward coupling notches of the upright lugs of the base plate, wherein the pedal unit can be turned downwards and collapsed when it is forced backwards to release the locating elements from the backward coupling notches of the upright lugs and the tie screws from the narrower front sections of the key holes.

Abstract: A pedal mechanism coupling device for coupling the pivot shaft of a first pedal mechanism to the pivot shaft of a second pedal mechanism permitting the beaters of both pedal mechanism to be separately controlled to beat a base drum, the coupling device having a hexagonal axial hole and a radial screw hole at one end to hold a hexagonal link by a tightening up screw, which link is turned back and forth by the second pedal mechanism, and two axle bearings longitudinally aligned at an opposite end to hold the pivot shaft of the first pedal mechanism to the coupling device by a headed screw permitting to the pivot shaft of the first pedal mechanism to be turned back and forth relative to the coupling device. A tightening up screw threaded into the radial screw hole on said base block to hold down said hexagonal link, two bearing chambers defined within said base block and said cover block, two axle bearings received in said bearing chambers and longitudinally aligned.

Abstract: A base drum beater amplitude adjustment device including a beater holder fixed to a revolving shaft of the pedal mechanism of a base drum to hold a beater, a flywheel consisting of two opposing parts joined together by screws and driven to turn the revolving shaft back and forth, and a locating device made of a split cylinder mounted around the polygonal revolving shaft and held down by the flywheel to stop the revolving shaft from rotary motion relative to the flywheel, wherein the angular position of the beater is adjusted by loosening the screws and turning the revolving shaft relative to the flywheel.

Abstract: A collapsible guitar stand which includes a top member having two bottom holes spaced by a bottom frame, two front legs pivotably connected to either bottom hole of the top member, a back leg pivotably connected to a longitudinal groove on the bottom frame, and two supporting rods respectively and pivotably connected to oblong holes on the front legs to hold a guitar on the front legs. The guitar stand is collapsed by turning the supporting rods upwards toward the front legs, moving the front legs inward toward each other, and moving the back leg forward toward the front legs.

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.