초록 ▼

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 be

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.

대표청구항 ▼

[ I claim:] [10.] A quick coupling mechanism for a power tool comprising:an elongated tool body having an end surface with an axial bore formed therein;an end cap secured to the tool body and having an end wall spaced axially from said end surface for cooperation therewith to define a cavity therebe

[ I claim:] [10.] A quick coupling mechanism for a power tool comprising:an elongated tool body having an end surface with an axial bore formed therein;an end cap secured to the tool body and having an end wall spaced axially from said end surface for cooperation therewith to define a cavity therebetween, said end wall having formed therethrough an opening with plural first lobes;a tool bit with a shank having plural second lobes arranged so that said shank is receivable axially in and removable axially from the bore in a first rotational orientation with said second lobes axially aligned with said first lobes,said shank being receivable in said bore to an inserted position wherein said second lobes are disposed in said cavity; anda bias mechanism operable when said second lobes are in said cavity for resiliently urging said second lobes and said shank to a latched condition in a second rotational orientation with said second lobes out of axial alignment with said first lobes and cooperating with said end wall to inhibit removal of said shank from said bore.