发明名称 |
Gear shifting speed change apparatus for a rotary electric tool |
摘要 |
A gear shifting speed change apparatus for a rotary electric tool such as a drill having an electric motor driving a first pair of unequal diameter pinion gears which are in continuous driving engagement with a second pair of pinion gears. The gears of second pair are independently mounted next to each other for free rotation on a shaft having an axial keyway. An axially sliding key is manually shifted to engage either one, but not both, of the second pair of gears by means of a pair of projections extending radially outwardly from the sliding key, one projection being axially outside the outer face of each gear and engageable with a recess in the outer face of the adjacent gear.
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申请公布号 |
US4493223(A) |
申请公布日期 |
1985.01.15 |
申请号 |
US19820415981 |
申请日期 |
1982.09.08 |
申请人 |
MATSUSHITA ELECTRIC WORKS, LTD. |
发明人 |
KISHI, ICHIRO;NAKAGAWA, HISAO |
分类号 |
B23B45/00;B23B45/02;B25F5/00;(IPC1-7):F16H3/08;E21B3/00;F16D21/00 |
主分类号 |
B23B45/00 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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