Tool driving or impacting – Impacting devices – With means for rotating tool
Reexamination Certificate
2006-07-11
2006-07-11
Smith, Scott A. (Department: 3721)
Tool driving or impacting
Impacting devices
With means for rotating tool
C173S080000, C173S206000, C173S078000
Reexamination Certificate
active
07073607
ABSTRACT:
A hydraulic rock drill comprises a housing having a piston and valve bore formed therein, a rotation motor, and a fluid connection and fluid reservoir interposed between the housing and the rotation motor. Fluid connections to the hydraulic rock drill comprise a single inlet fluid connection to the housing and a single exhaust fluid connection from the rotation motor. The working shoulder areas of the piston are proportioned so that the exhaust stroke of the piston will pressurize the fluid in the reservoir, providing a fluid inlet source for the rotation motor. When the rotation torque demand increases, pressure in the fluid reservoir and pressure in the fluid inlet connection will rise accordingly, thus providing higher rotation torque while maintaining impact power. When fluid inlet pressure reaches a predetermined limit, rotation and impact will lessen or cease altogether.
REFERENCES:
patent: 3701386 (1972-10-01), Feucht
patent: 3822752 (1974-07-01), Montabert
patent: 4039033 (1977-08-01), Salmi
patent: 4103746 (1978-08-01), Reynolds
patent: 4126192 (1978-11-01), Wallace
patent: 4289209 (1981-09-01), Salmi
patent: 4846288 (1989-07-01), Hunt
patent: 5117921 (1992-06-01), Bartels et al.
patent: 5415240 (1995-05-01), Mundjar
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