Patent ID: 8110731

Claim:
A transmission linkage for a drum assembly, connecting a pedal unit to a striking portion, the transmission linkage comprising: a pole; a first joint, connecting the pole to the pedal unit; a second joint, connecting the pole to the striking portion; wherein at least one of the first joint and the second joint comprises a first unit and a second unit, the first unit and the second unit are rotatable about an axis with respect to each other, the first unit comprises a pair of spaced arms, each arm is formed with a threaded hole, the second unit has two corresponding surfaces and two coaxial containing recesses, the containing recesses are located on the surfaces individually, the axis is defined in the threaded holes and the containing recesses; two threaded members, each threaded member comprising a threaded section and an axial section, the axial section extending axially from the threaded section, the threaded section being screwed in the threaded hole, the axial section being received in the containing recess; two bearing units, each bearing unit being carried in one of the containing recesses, each axial section being held by one of the bearing units, so that the axial sections are able to rotate with respect to the containing recesses.