Power tool with oil circulation apparatus

Details Power tool with oil circulation apparatus Power tool with oil circulation apparatus

2006-01-10

2006-01-10

Smith, Scott A. (Department: 3721)

Tool driving or impacting

Impacting devices

With anvil arranged to transmit torsional impact to tool

C173S093000

Reexamination Certificate

active

06983808

ABSTRACT:
A power tool includes a sleeve, two pistons, a converter and a striker. The sleeve includes an axial aperture defined therein, a space communicated with the axial aperture, two grooves defined in the wall of the space and peripheral apertures communicated with the space. Oil flows into and from the space through the peripheral apertures. The pistons are put in the grooves. The converter is provided between the sleeve and the pistons for converting the rotation of the sleeve into rectilinear movement of the pistons. The striker is driven by the pistons.

REFERENCES:
patent: 3174597 (1965-03-01), Schaedler
patent: 3414065 (1968-12-01), Falter
patent: 3533479 (1970-10-01), Albertson
patent: 3578091 (1971-05-01), States
patent: 4313505 (1982-02-01), Silvern
patent: 5622230 (1997-04-01), Giardino et al.
patent: 6135212 (2000-10-01), Georgiou
patent: 6446735 (2002-09-01), Chen
patent: 6464017 (2002-10-01), Chen
patent: 6796386 (2004-09-01), Izumisawa et al.

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