Drill head unit

Details Drill head unit Drill head unit

1996-02-16

1997-11-25

Smith, Scott A.

Tool driving or impacting

Means to drive tool about an axis

Gear drive

173198, E21C 702

Patent

active

056901836

ABSTRACT:
The present invention is an improved drill head unit in which the lower portion of the drill chuck has a lobed shaped cross section which fits into a corresponding lobed shaped opening in a shaft connected to a spiral bevel gear mounted for rotation about a vertical axis. The lobed shaped cross section replaces the spline drive previously used in such units. An improved and simplified radial elastomeric seal is provided to separate a vacuum pressurized cavity in the housing from a lubricating cavity in the housing, and the seal is replaceable by removing a cartridge in the bottom of the drill head unit.

REFERENCES:
patent: 2821963 (1958-02-01), Curtis
patent: 3719254 (1973-03-01), Snider
patent: 4190116 (1980-02-01), O'Neal et al.
patent: 4294317 (1981-10-01), Amoroso
patent: 4298073 (1981-11-01), Yates
patent: 4416337 (1983-11-01), Phillips et al.
patent: 4470469 (1984-09-01), Coakley et al.
patent: 4856384 (1989-08-01), Wechner

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