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US Patent: 6,000,888
Quick Coupler Mechanism for Power Tool Bits
Robert L. Hartman - Milwaukee, WI

USPTO Classifications:
173/59, 173/71, 279/91, 279/93, 403/348, 403/360, 408/239R

Tool Categories:

Snap-On Tools Co. - Kenosha, WI

Not known to have been produced

none listed

Patent Dates:
Applied: Feb. 12, 1999
Granted: Dec. 14, 1999

Patent Pictures:
USPTO pdf tiff
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Snap-On Tools Company History
Emrich & Dithmar - patent attorneys


A pneumatic impact power tool has a tool body with a bit-receiving axial bore in its end surface. A cap is threaded on the end of the tool body and has an end wall spaced from the end surface to define a cavity and a lobed opening in the cavity matably receiving a like-lobed bit shank, the cavity being dimensioned to accommodate the lobes. Spring-biased balls project into the cavity from radial bores in the end cap to engage the shank lobes and bias them to a rotational position non-aligned with the opening lobes to inhibit removal. The cavity is dimensioned to afford a slight axial clearance to accommodate axial movement of the lobes. A cover on the end cap is recessed to receive the bias springs, retaining both the springs and the cover in place. The end cap has a annular channel communicating with an exhaust passage in the tool body and four exhaust ports in the end wall.

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