Abstract: A joint instrument support assembly is disclosed. Both sides of a rotating elbow have an ear part, respectively. A groove is formed between the two ear parts. One ear part communicates with the groove via a circular hole. The two ear parts have a circular wall toward the groove, respectively. A rotating block is disposed in the rotating elbow. A rod goes through the rotating block. A limiting element locks on the rod and positions in the axle hole to rotate with respect to the rotating block. A sliding block having a through hole and an outer thread part is disposed in an accommodating room. A pad is mounted on the outer thread part and strides across the outer edges of the two circular walls. A fastening element locks onto the outer thread part outside the pad.

Abstract: A tube tightening structure of a music instrument is disclosed. A plastic body is provided inside a metal hollow shell. The body has a through hole for the insertion of a tube. The body has an extension part that has a tightening part. A threaded element is connected with a rotating element outside the shell. The rotation of the rotating element displaces the threaded element, so that the tightening part tightly holds the tube in the through hole of the body.

Abstract: A support for a practicing drum or electronic drum includes a pipe element with several stands. The pipe element is penetrated with a vertical bar. The support has a bar element whose both ends have first and second adjusting structures, respectively. The vertical bar goes through the first adjusting structure. The second adjusting structure has a side bar whose end is disposed with an instrument, such as drum or cymbal. The first and second adjusting structures enable the bar element and the side bar to change their orientations and positions. An instrument pedal is disposed underneath the pipe element. The instrument pedal and the pipe element are connected by a connecting structure to achieve firm positioning.

Abstract: An instrument stand with variable ground contact positions of its supporting pods is disclosed. It has a standing post mounted with two positioning rings. One of them is fixed, and the other can slide relative to the former. The positioning rings have several supporting bases and several connecting elements that fix with the supporting bases after angle adjustment. The supporting pods are locked on the two positioning rings. Each supporting pod is controlled by the relative motion of the two positioning rings to expand and collapse. The ground contact positions of the supporting pods of the invention are thus variable.

Abstract: A heelless instrument pedal device includes a bottom board and a pedal board. The bottom board is in connection with an instrument support and has two pivotal connection elements protruding upwards with a ball shape. The rear bottom surface of the pedal board has a pivotal connection base corresponding to the pivotal connection elements. The pedal board is connected to the pivotal connection elements on the bottom board using the pivotal connection base. Thus, the pedal board can swing in the direction of the force applied by the user's foot. The front end of the pedal board has a linking element, so that the linking element moves as the pedal board swings with respect to the pivotal connection elements.

Abstract: An instrument stand with variable ground contact positions of its supporting pods is disclosed. It has a standing post mounted with two positioning rings. One of them is fixed, and the other can slide relative to the former. The positioning rings have several supporting bases and several connecting elements that fix with the supporting bases after angle adjustment. The supporting pods are locked on the two positioning rings. Each supporting pod is controlled by the relative motion of the two positioning rings to expand and collapse. The ground contact positions of the supporting pods of the invention are thus variable.

Abstract: A musical instrument stand assembly with a foldable pedal includes a main stand body, and the main stand body includes a main rod, and the bottom of the main rod includes two support rods each with a recession, and the recession includes a first circular serration; two side frames, and a sidewall of each side frame includes a protrusion and a second circular serration at the protrusion, and each side frame is installed by engaging each protrusion with the recession of each support rod, such that the first and second circular serrations are engaged with each other. With the design of rotably engaging the two side frames and the two support rods, the main stand body of the musical instrument has the function of adjusting its inclination with respect to a vertical position, and the effect of conveniently folding the pedal of the musical instrument.

Abstract: A musical instrument stand assembly with a foldable pedal includes a main stand body, and the main stand body includes a main rod, and the bottom of the main rod includes two support rods each with a recession, and the recession includes a first circular serration; two side frames, and a sidewall of each side frame includes a protrusion and a second circular serration at the protrusion, and each side frame is installed by engaging each protrusion with the recession of each support rod, such that the first and second circular serrations are engaged with each other. With the design of rotably engaging the two side frames and the two support rods, the main stand body of the musical instrument has the function of adjusting its inclination with respect to a vertical position, and the effect of conveniently folding the pedal of the musical instrument.

Abstract: A drum bracket including an adjustment rod and three support bars pivotally connected with upper end of the adjustment rod at equal angular intervals. Each support bar has a swinging end. An L-shaped claw section is pivotally connected with the swinging end of each support bar and fixable with the support bar. A bush is axially movably fitted on the adjustment rod. Three links are pivotally connected with the bush at equal angular intervals. Each link is also pivotally connected with a middle section of each support bar. A bottom of the adjustment rod is formed with outer thread under the bush. An adjustment nut is screwed on the outer thread.

Abstract: An angle adjust device for a cymbal includes a connecting seat mounted to a free end of a cymbal stand. The connecting includes a hollow stub longitudinally extending through the connecting seat and a protrusion laterally extending from the connecting seat. A connector is mounted to the protrusion of the connecting seat and has a trough defined in the connector. The trough has an opening defined in one side of the connector facing the connecting seat. An actuated rod is limited in the connector. The actuated rod has a threaded section screwed into the threaded hole in the slider and a polygonal head co-axially extending from the threaded section through the connector for user to easily rotate the actuated rod and adjust a distance between the slider and the connecting seat.

Abstract: An instrument support elbow includes a seat body. A coupling seat upward extends from one side of the seat body for rotatably coupling with a rotary block. The rotary block is formed with a radial through hole for a support rod to extend therethrough. The rotary block is formed with a cavity perpendicularly intersecting the through hole. A fixing member passes through the cavity to the through hole. The fixing member is formed with a ring hole corresponding to the through hole, whereby the support rod extends through the ring hole and the through hole. A turning member extending out of the rotary block serves to drive the fixing member to move along the radius of the support rod.

Abstract: An instrument support elbow includes a seat body. A coupling seat upward extends from one side of the seat body for rotatably coupling with a rotary block. The rotary block is formed with a radial through hole for a support rod to extend therethrough. The rotary block is formed with a cavity perpendicularly intersecting the through hole. A fixing member passes through the cavity to the through hole. The fixing member is formed with a ring hole corresponding to the through hole, whereby the support rod extends through the ring hole and the through hole. A turning member extending out of the rotary block serves to drive the fixing member to move along the radius of the support rod.

Abstract: A metal drum frame with fixing lugs. A drumhead is mounted on each end face of a drum barrel of the drum. A drum frame is mounted around each drumhead. A top and a bottom edges of the drum frame are respectively formed with hollow bulge lips. A portion of the drum frame between the lips is recessed to form a waist section. The waist section of the drum frame is formed with several outward extending lugs. The lug is formed in such a manner that the waist section is transversely cut with two parallel cut lines defining the lug. The portion of the waist section between the two cut lines protrudes outward to form a substantially hollow hoop shape. A locking member is disposed in the lug. A bolt is passed through the locking member to tension the drumhead.

Abstract: A metal drum frame with fixing lugs. A drumhead is mounted on each end face of a drum barrel of the drum. A drum frame is mounted around each drumhead. A top and a bottom edges of the drum frame are respectively formed with hollow bulge lips. A portion of the drum frame between the lips is recessed to form a waist section. The waist section of the drum frame is formed with several outward extending lugs. The lug is formed in such a manner that the waist section is transversely cut with two parallel cut lines defining the lug. The portion of the waist section between the two cut lines protrudes outward to form a substantially hollow hoop shape. A locking member is disposed in the lug. A bolt is passed through the locking member to tension the drumhead.

Abstract: A Large-size drum frame with fixing lugs. The drum frame is a substantially annular frame for tensioning the drumhead. The drum frame integrally extends from inner face to top and bottom sides. The top and bottom edges are bent to respectively form hollow lips. A recessed straight waist section is formed between the upper and lower lips. The waist section of the drum frame near the lower lip is punched with a transverse cut line. The waist section on upper edge of the cut line is outward turned to form a plane face on middle portion. The plane face of the lug is formed with a bolt hole for a bolt to pass therethrough to tension the drumhead.

Abstract: An adjusting structure for musical instrument supporters includes a supporting leg, an adjuster integrally formed with an tipper end of the supporting leg and having two circular seats which is spaced apart by a slot, each of the circular seats having a center hole and formed with a shoulder, a positioner being generally cylindrical in shape and formed with a radial threaded hole and an eccentric threaded hole which are located close to an end of the positioner, the positioner being rotatably fitted in the adjuster with the radial threaded hole and the eccentric threaded hole located in the slot, another end of the positioner having a top formed with a first lug and a bottom with a second lug, a packing plate arranged on the shoulders of the circular seats and engaged with the positioner by a fixing bolt which extends through the packing plate the positioner, and a musical instrument supporter having an upper end configured to engage with a musical instrument and a lower end having threads engageable with a t

Abstract: An automatic control device for an air compressor is disclosed. The air compressor controlled by the automatic control device is provided with two operation modes, one is the idle-running/heavy-running operation mode and the other one is the auto-stop/start operation mode.