Tool driving or impacting – Impacting devices – With means for rotating tool
Patent
1996-08-14
1998-07-07
Smith, Scott A.
Tool driving or impacting
Impacting devices
With means for rotating tool
173201, B25D 1106
Patent
active
057754403
ABSTRACT:
A hammer drill has an aluminum cylinder non-rotatably mounted in a crank housing, a synthetic resin slide sleeve, and a tool holder. The latter two members are coaxially fitted over the front part of the cylinder. The slide sleeve is a cylindrical member slidably mounted between a large bore portion of the tool holder and the cylinder. A steel ring is mounted at the rear of the slide sleeve. The slide sleeve and the steel ring are urged in the forward direction by a compression spring interposed between a bevel gear and the steel ring. A first air chamber which is formed in the cylinder includes a plurality of air ports which are covered by the steel ring when the slide sleeve and steel ring are pushed in their respective rear positions by pressing a tool bit attached to the hammer against a work piece. A plurality of wide and narrow slits are formed in the front portion of the slide sleeve while a plurality of air passage holes are also formed in the large bore portion of the tool holder.
REFERENCES:
patent: 4567951 (1986-02-01), Fehrle et al.
patent: 4719976 (1988-01-01), Bleicher et al.
patent: 4932479 (1990-06-01), Pyatov
patent: 5111890 (1992-05-01), Ranger et al.
patent: 5435397 (1995-07-01), Demuth
Makita Corporation
Smith Scott A.
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