초록 ▼

Methods and apparatus for generating a linear vibratory output force having a variable amplitude. The force is generated by the cooperation of four rotating eccentric masses that are grouped in two pairs of two masses. The masses in each pair are counter-rotating (i.e., they rotate at the same speed

Methods and apparatus for generating a linear vibratory output force having a variable amplitude. The force is generated by the cooperation of four rotating eccentric masses that are grouped in two pairs of two masses. The masses in each pair are counter-rotating (i.e., they rotate at the same speed but in opposite directions). The phase relationship between the two pairs is adjustable. For example, the phase of one pair can be advanced while the phase of the other pair is retarded by an equal amount, thereby changing the amplitude of the output force without changing the direction along which the force acts, and also without changing its frequency if desired.

대표청구항 ▼

[ The invention claimed is:] [1.] A method for varying the amplitude of a substantially linear vibratory output force, said output force being generated by a device having a first pair of counter-rotating eccentric masses which are mechanically linked so that they generate a first periodic force whi

[ The invention claimed is:] [1.] A method for varying the amplitude of a substantially linear vibratory output force, said output force being generated by a device having a first pair of counter-rotating eccentric masses which are mechanically linked so that they generate a first periodic force which always acts along a line which is fixed in a plane perpendicular to an axis of rotation of said first pair and having a second pair of counter-rotating eccentric masses which are mechanically linked so that they generate a second periodic force which always acts along said line, said first periodic force and said second periodic force algebraically combining to produce said vibratory output force acting along said line, said method comprising the steps of:controlling the phase of rotation of said first pair of counter-rotating eccentric masses relative to the phase of said vibratory output force to advance said phase of said first pair relative to said phase of said vibratory output force by a specific amount; andsimultaneously controlling the phase of rotation of said second pair of counter-rotating eccentric masses relative to said phase of said vibratory output force to retard said phase of said second pair relative to said phase of said vibratory output force by said specific amount.