Abstract: Coded keys are produced by reference to a set of matrix keys, each matrix key of a set has uniform notch spacing and a uniform but different depth compared to the others. A holder carries a complete matrix key set. The holder, in turn, is securable to a carriage having a key blank-retaining vise. By manipulating the holder, any selected one of the matrix keys may be brought into fixed coplanar and linear registration with the key blank. As the holder and carriage are moved synchronously, a first matrix key is urged toward a stylus at a given code location defined by a notch of specific depth and a cutter removes material from the key blank to form a corresponding notch. The process is repetitively performed until a notch of the prescribed code depth is defined at each location along the key blank needed to form a replacement key.

Abstract: Coded keys are produced by reference to a set of matrix keys, each matrix key of a set has uniform notch spacing and a uniform but different depth compared to the others. A holder carries a complete matrix key set. The holder, in turn, is securable to a carriage having a key blank-retaining vise. By manipulating the holder, any selected one of the matrix keys may be brought into fixed coplanar and linear registration with the key blank. As the holder and carriage are moved synchronously, a first matrix key is urged toward a stylus at a given code location defined by a notch of specific depth and a cutter removes material from the key blank to form a corresponding notch. The process is repetitively performed until a notch of the prescribed code depth is defined at each location along the key blank needed to form a replacement key.

Abstract: A tremolo device for use on a musical instrument having a neck extending between a body and head, and a plurality of strings under tension aligned with the neck includes a bridge structure resiliently supportable relative to the body for rotation about a pivot axis transverse to the neck. String retaining elements of the bridge structure are movable therewith, each being dimensioned and arranged to engage a corresponding string. An actuating lever extends rearwardly from a point of attachment to the bridge structure to a point further from the neck and pivot axis than the point of attachment. Lifting of the actuating lever by an upward force exerted by a strumming or plucking finger reduces tension in the strings and lowers the tone of the musical element and exertion of a downward force upon the actuating lever increases tension in the strings and increases the tone of the musical instrument.

Abstract: A tremolo device for use on a musical instrument having a neck extending between a body and head, and a plurality of strings under tension aligned with the neck includes a bridge structure resiliently supportable relative to the body for rotation about a pivot axis transverse to the neck. String retaining elements of the bridge structure are movable therewith, each being dimensioned and arranged to engage a corresponding string. An actuating lever extends rearwardly from a point of attachment to the bridge structure to a point further from the neck and pivot axis than the point of attachment. Lifting of the actuating lever by an upward force exerted by a strumming or plucking finger reduces tension in the strings and lowers the tone of the musical element and exertion of a downward force upon the actuating lever increases tension in the strings and increases the tone of the musical instrument.

Abstract: A key duplication system employs a modular key duplication attachment in combination with a high-speed, rotary powered tool and a profiled abrasive cutter. The attachment comprises a base, a carriage assembly movable relative to the base, a profiled stylus secured to the base, a first clamping vise for retaining a specimen key at a fixed (i.e., stationary) position relative to the carriage assembly and a second clamping vise for retaining a key blank at a fixed position relative to the carriage assembly. When so-retained, a bottom flat surface of the specimen key and a bottom flat surface of the key blank rest in a common working plane and the tip of each key is separated by a first distance. The cutter and stylus are aligned and secured to the base such that movement of the carriage, relative to the base, simultaneously brings them both into contact with appropriate surfaces of the key blank and the specimen key, respectively.

Abstract: A key duplication system employs a modular key duplication attachment in combination with a high-speed, rotary powered tool and a profiled abrasive cutter. The attachment comprises a base, a carriage assembly movable relative to the base, a profiled stylus secured to the base, a first clamping vise for retaining a specimen key at a fixed (i.e., stationary) position relative to the carriage assembly and a second clamping vise for retaining a key blank at a fixed position relative to the carriage assembly. When so-retained, a bottom flat surface of the specimen key and a bottom flat surface of the key blank rest in a common working plane and the tip of each key is separated by a first distance. The cutter and stylus are aligned and secured to the base such that movement of the carriage, relative to the base, simultaneously brings them both into contact with appropriate surfaces of the key blank and the specimen key, respectively.

Abstract: A key duplication system employs a modular key duplication attachment in combination with a high-speed, rotary powered tool and a profiled abrasive cutter. The attachment comprises a base, a carriage assembly movable relative to the base, a profiled stylus secured to the carriage, a first clamping vise for retaining a specimen key at a fixed (i.e., stationary) position relative to the base and a second clamping vise for retaining a key blank at a fixed position relative to the base. When so-retained, a bottom flat surface of the specimen key and a bottom flat surface of the key blank rest in a common plane and the tip of each key is separated by a first distance. The cutter and stylus are aligned such that movement of the carriage, relative to the base, simultaneously brings them both into contact with appropriate surfaces of the key blank and the specimen key, respectively.

Abstract: A key duplication system employs a modular key duplication attachment in combination with a high-speed, rotary powered tool and a profiled abrasive cutter. The attachment comprises a base, a carriage assembly movable relative to the base, a profiled stylus secured to the carriage, a first clamping vise for retaining a specimen key at a fixed (i.e., stationary) position relative to the base and a second clamping vise for retaining a key blank at a fixed position relative to the base. When so-retained, a bottom flat surface of the specimen key and a bottom flat surface of the key blank rest in a common plane and the tip of each key is separated by a first distance. The cutter and stylus are aligned such that movement of the carriage, relative to the base, simultaneously brings them both into contact with appropriate surfaces of the key blank and the specimen key, respectively.