Impact power tool with a precision controlled drive system

Details Impact power tool with a precision controlled drive system Impact power tool with a precision controlled drive system

2006-08-03

2008-08-19

Smith, Scott A. (Department: 3721)

Tool driving or impacting

Impacting devices

Length of cyclic travel of hammer head selectively adjustable

C173S030000, C173S200000, C173S207000

Reexamination Certificate

active

07413027

ABSTRACT:
An improved impact power tool for carving and engraving an article comprises an air delivery system operable to communicate with a pressurized air source; a drive assembly operable to receive air from the pressurized air source via the air delivery system; a hand held device in driven communication with the drive assembly; and a housing for storage of the air delivery system and drive assembly. The tool includes an improved valve design, a throttle bias valve, and an air storage tank housed within the housing, and an improved housing construction. The improved valve design and air storage tank enable greater stroke speeds of a work tool over a wider power range while also improving the crispness and speed of the impact reaction time over the entire range. The throttle bias valve is in communication with an additional exhaust path, such that the bias valve allows improved control of the hand held device and improved operation over a wider range of air pressures.

REFERENCES:
patent: 3393755 (1968-07-01), Glaser et al.
patent: 4694912 (1987-09-01), Glaser
patent: 4903784 (1990-02-01), Glaser
patent: 5203417 (1993-04-01), Glaser
patent: 5857485 (1999-01-01), Perkins et al.
patent: 6488102 (2002-12-01), Lindsay
patent: 6691798 (2004-02-01), Lindsay
patent: 7048073 (2006-05-01), Hezeltine

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