It is made possible to give prevailing torque to an adjustment bolt in a simple manner without troublesome adjustment work. An anti-loosening adjustment bolt assembly includes: a cylindrical pipe (6) adapted to be fitted on the screw shaft (2a) of the adjustment bolt (2); and a nut (7) having a threaded hole for allowing the screw shaft (2a) to be threadably mounted thereon; the bottom of the nut (7) includes a recess (7a) adapted to allow the upper end of the cylindrical pipe (6) to be fitted therein; the inner peripheral surface of the recess (7a) is a taper surface decreasing in diameter toward the interior; and the axis of the taper surface is slightly eccentric from the axis of the threaded hole such that, when the nut (7), threadably secured to the screw shaft (2a), is screwed toward the cylindrical pipe (6), a circumferential portion of the eccentric taper surface comes into pressure-contact with the upper end of the cylindrical pipe (6) and the axis (Q) of the threaded hole of the nut (7) is eccentric and/or inclined from the axis (O) of the screw shaft (2a) to generate prevailing torque depending on the amount of tightening of the nut (7) on the adjustment bolt (2).

It is made possible to give prevailing torque to an adjustment bolt in a simple manner without troublesome adjustment work. An anti-loosening adjustment bolt assembly includes: a cylindrical pipe (6) adapted to be fitted on the screw shaft (2a) of the adjustment bolt (2); and a nut (7) having a threaded hole for allowing the screw shaft (2a) to be threadably mounted thereon; the bottom of the nut (7) includes a recess (7a) adapted to allow the upper end of the cylindrical pipe (6) to be fitted therein; the inner peripheral surface of the recess (7a) is a taper surface decreasing in diameter toward the interior; and the axis of the taper surface is slightly eccentric from the axis of the threaded hole such that, when the nut (7), threadably secured to the screw shaft (2a), is screwed toward the cylindrical pipe (6), a circumferential portion of the eccentric taper surface comes into pressure-contact with the upper end of the cylindrical pipe (6) and the axis (Q) of the threaded hole of the nut (7) is eccentric and/or inclined from the axis (O) of the screw shaft (2a) to generate prevailing torque depending on the amount of tightening of the nut (7) on the adjustment bolt (2).

A tuning assembly and tunable drug system are described. The tuning assembly including a pressure ring, a rope ring with a first plurality of holes and a second plurality of holes, a rope system coupled to the first plurality of holes and a membrane of a drum head, and a plurality of fasteners engaging the second plurality of holes in the rope ring and a surface of the pressure ring. Tightening the plurality of fasteners increases the distance between the rope ring and the pressure ring causing the rope ring to pull the rope system and apply pressure to the membrane of the drum head.

A tuning assembly and tunable drug system are described. The tuning assembly including a pressure ring, a rope ring with a first plurality of holes and a second plurality of holes, a rope system coupled to the first plurality of holes and a membrane of a drum head, and a plurality of fasteners engaging the second plurality of holes in the rope ring and a surface of the pressure ring. Tightening the plurality of fasteners increases the distance between the rope ring and the pressure ring causing the rope ring to pull the rope system and apply pressure to the membrane of the drum head.

A drumhead tuning rim system and method for securing and tuning a drumhead on a drum shell of a drum, comprising a drumhead tuning rim apparatus comprising a cable tension dial assembly configured for operably engaging a rim of the drum so as to increase or decrease tension on the rim, the rim being configured for seating over the drumhead on the drum shell, and an apparatus controller configured for operably interfacing with the drumhead tuning rim apparatus so as to selectively control the cable tension dial assembly and thereby adjust the overall pitch of the drumhead as by adjusting the tension on the rim.

A drumhead tuning rim system and method for securing and tuning a drumhead on a drum shell of a drum, comprising a drumhead tuning rim apparatus comprising a cable tension dial assembly configured for operably engaging a rim of the drum so as to increase or decrease tension on the rim, the rim being configured for seating over the drumhead on the drum shell, and an apparatus controller configured for operably interfacing with the drumhead tuning rim apparatus so as to selectively control the cable tension dial assembly and thereby adjust the overall pitch of the drumhead as by adjusting the tension on the rim.

Drum hardware tools are described. Some implementations may include a tension rod hardware tool designed for assembling/installing/setting up and/or disassembling/uninstalling tension rods. Some implementations may include a drum wing nut hardware tool designed for assembling/installing/setting up and/or disassembling/uninstalling drum hardware wing nuts.

A drumstick is integrated with a drum key for ready availability of a drum key in more situations. The drumstick provides an elongated handle for actuating the key while the key's presence does not interfere with the drumstick's natural use. The drumstick may be organically fashioned with a drum key hollowed out from its own material, thereby providing the requisite negative space, or an insert may be positioned within a butt end of the drumstick which presents the negative space of the drum key. Alternately a sleeve may be positioned on the drumstick to accommodate a key insert or an integral key portion.

The invention relates to a drum having a drum shell which forms an upper and a lower part (1, 2), is divided by a system ring (3) and is covered on each of the two open cover sides by a respective drumhead (4) which is tensioned down on the drum by a respective tension hoop (5) which is fastened to the drum by way of tuning screws (6), wherein the tension hoops (5) are tensioned against the common system ring (3) by way of their respective tuning screws (6) with interposition of the upper and lower parts (1, 2) respectively. In order to create advantageous construction conditions, it is proposed that the drum shell consists at least in sections of stone material and that the upper and lower parts (1, 2) of the two-part drum shell are bonded to the system ring (3) via stone silicone as an adhesive.

The invention relates to a drum having a drum shell which forms an upper and a lower part (1, 2), is divided by a system ring (3) and is covered on each of the two open cover sides by a respective drumhead (4) which is tensioned down on the drum by a respective tension hoop (5) which is fastened to the drum by way of tuning screws (6), wherein the tension hoops (5) are tensioned against the common system ring (3) by way of their respective tuning screws (6) with interposition of the upper and lower parts (1, 2) respectively. In order to create advantageous construction conditions, it is proposed that the drum shell consists at least in sections of stone material and that the upper and lower parts (1, 2) of the two-part drum shell are bonded to the system ring (3) via stone silicone as an adhesive.