Patent ID: 7932450

Claim:
A capo, comprising: a string press element; a trigger; and a clamping lever; wherein the string press element includes a length with two ends, a first end being a string pressing end and a second end joining to a perpendicularly extending arm, the arm including an action end, providing two sidewalls enclosing a trigger slot, and including first and second axle holes on the sidewalls, the first and second axle holes being provided with axles for holding the trigger and clamping level; wherein the trigger is an elongate arm and includes a first and second end and a length, a sliding end at the first end, and a user operating end at the second end, the trigger further including first axle holes at an intermediate position of the length, the trigger being mounted within the trigger slot of the string press element by coupling the second axle holes of the string press element and the first axle holes of the trigger through the axle; wherein the clamping lever includes a length, an intermediate portion, a clamping end, and an adjustment end, the clamping end contacts an instrument neck for clamping, and the adjustment end adjustably interfaces the sliding end of the trigger, the adjustment end further including a screw hole, an adjustment screw, an abutting adjustment arm, and an elastic element, the abutting adjustment arm including a sliding contact to engage the sliding end of the trigger, an opposite surface to contact the adjustment screw, and axle holes to pivot with respect to the clamping lever, and the elastic element biasing the clamping lever open; wherein the intermediate portion includes two sidewalls to form a first trench receiving a butting element, and axle holes on the sidewalls, the first trench being received in the trigger slot of the string press element by coupling the first axle holes of the string press element and the axle holes of the clamping lever through the axle; and wherein the butting element has a butting end at one end and a hinge end at the other end, the hinge being coupled with the intermediate portion that pivotally interconnects the arm of the string press element with the clamping lever, the butting end being interposed between the sliding end of the trigger and the adjustment end of the clamping lever.