US 4,257,648 A · Non-resonant cyclic drive system employing rectification of the cyclic output

Abstract

A vibratory drive system for use in spalling a road surface, cutting rock, etc. Vibratory energy is generated by means of an orbiting mass oscillator, the output of which is rectified by means of a rectifier to provide unidirectional pulses to a cutting tool. In the interests of making the system compact and providing controlled operational parameters, non-resonant operation is employed, optimum drive to the tool being achieved by biasing the oscillator against the tool and by providing a shoulder which fixes the uppermost position of the tool when it is being biased against a load. The tool position and the design of the oscillator are such that the oscillator housing contacts the tool near the mid-down stroke (90.degree.) of the oscillatory vibration cycle, this being the point of highest vibratory velocity and kinetic energy. In this manner, the highest possible delivery of energy to the tool is provided.

Claims14

Dependent claims

A non-resonant cyclic drive system for cutting into a hard material load by means of unidirectional cyclic force pulses comprising

an orbiting mass oscillator including an eccentric rotor and a housing for rotatably supporting said rotor,
means for driving said oscillator so as to induce non-resonant longitudinal vibration of said housing,
means for supporting said housing for reciprocal motion substantially in the directions of said longitudinal vibration,
a cutting tool having a cutter head, said cutter head being biased against said load by the weight of said tool,
means for supporting said tool for reciprocal motion substantially in the directions of said longitudinal vibration,
means for biasing said housing towards said tool, and
stop means for limiting the furthest travel of said tool toward said housing to a predetermined position,
a predetermined gap being formed between said housing and said tool at the furthest vibratory excursion of said housing away from said tool and said housing initially contacting said tool during its vibratory excursion towards said tool approximately at the midpoint of said last-mentioned excursion.

5 more elements

A machine for spalling or planing a concrete surface comprising

a main frame,
a tool support assembly,
means for pivotally supporting said assembly from said main frame,
an orbiting mass oscillator including an oscillator housing and two pairs of eccentric rotors rotatably supported in said housing,
means for rotatably driving one pair of said rotors in one direction and the other pair of said rotors in a direction opposite to said one direction to cause vibration of said oscillator housing in a longitudinal vibration mode with transverse vibrations being cancelled out,
means for pivotally supporting the oscillator housing on said tool support assembly for reciprocal motion substantially in the directions of the longitudinal mode of vibration of the oscillator housing,
a tool member,
means for pivotally supporting the tool member on the tool support assembly for reciprocal motion substantially in the directions of the longitudinal mode of vibration of the oscillator housing,
biasing means positioned between the main frame and the oscillator housing for resiliently urging the housing towards said tool member, and stop means for limiting the furthest travel of said tool member towards said housing at a predetermined position,
a predetermined gap appearing between the housing and the tool at the furthest vibratory excursion of the housing away from the tool and the housing initially contacting the tool during its vibratory excursion towards the tool approximately at the midpoint of said last-mentioned excursion.

7 more elements

Dependencies are inferred from the claim text.

Non-resonant cyclic drive system employing rectification of the cyclic output

Life of this patent

Non-resonant cyclic drive system employing rectification of the cyclic output

Life of this patent

Abstract

Claims14